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Preparation of phosphorous-rich iron via hydrogen reduction-melting separation of high-phosphorus oolitic hematite 认领 引用
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作者 Yi-Jiang Zhao Guang-Qiang Li +3 位作者 Jun-Bo Li Jiang-Hua Ma Wen Yan Yu Liu 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第7期366-379,共14页
Distinct from conventional dephosphorization approaches,a novel low-carbon and efficient strategy was proposed for producing phosphorus-rich iron via hydrogen reduction-melting separation of high-phosphorus oolitic he... Distinct from conventional dephosphorization approaches,a novel low-carbon and efficient strategy was proposed for producing phosphorus-rich iron via hydrogen reduction-melting separation of high-phosphorus oolitic hematite.The process requires neither additional fluxes nor complex pretreatment of the ore.Adjustment of the pellet FeO content via control of the reduction degree enables modulation of the physicochemical characteristics of the autogenous slag,thereby promoting efficient phosphorus-rich iron production under optimized slag-metal separation conditions.Experimental results indicate that roasting at 1200℃promotes the grain growth of hematite and significantly enhances the strength of the pellets.The hydrogen reduction process of high-phosphorus oolitic hematite at 900-1000℃follows the unreacted core model,with the reduction rate controlled by interfacial chemical reactions.During the hydrogen reduction process at 1000℃,apatite was not reduced.As the metallic iron particles aggregated and grew,apatite and gangue phases formed complex slag phases.Appropriate adjustment of the pellet reduction degree enables control of the phosphorus content in the phosphorus-rich iron obtained during the melting process.This regulation is related to the oxygen potential of the slag and the kinetic conditions.By controlling the reduction degree of the pellets within the range of 75%-90%,the phosphorus content in the resulting metal products was effectively adjusted from 0.64 to 1.53 wt.%.At a pellet reduction degree of 90%,the recoveries of both iron and phosphorus after melting exceeded 80%.This result confirms a green and efficient method for recovering iron and phosphorus from oolitic hematite without using flux. 展开更多
关键词 Oolitic hematite Phosphorus-rich iron Hydrogen reduction Reduction degree Melting separation
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Comparative study of magnetic reduction-separation behavior and kinetics of refractory oolitic iron ore through coal-based versus gas-based reductive roasting 认领 引用
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作者 Ming-Xia Liu Hui-Min Zhang +4 位作者 Tie-Jun Chen Han-Quan Zhang Fan Yang Zhao-Hui Yao Man-Man Lu 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第4期438-450,共13页
A comparative study was conducted on the kinetics of coal-and gas-based magnetization roasting processes and the reduction-separation behavior for an oolitic hematite ore.The magnetization reduction rate of roasted or... A comparative study was conducted on the kinetics of coal-and gas-based magnetization roasting processes and the reduction-separation behavior for an oolitic hematite ore.The magnetization reduction rate of roasted ore reached 46.86%when roasting for 45 min under 750℃ with coal-to-ore ratio of 8%for coal-based system,an optimized concentrate with iron grade and recovery rate of 61.51%and 91.43%could be obtained;for gas-based system,the magnetization rate was 44.34%,and the iron grade and recovery rate reached 58.09% and 94.30% under the optimized roasting temperature of 650℃ for 60 min with CO proportion of 30%.Microscopic morphology analyses indicated that the transformation process for both systems was in accordance with the unreacted-core shrinking model.Artificial magnetite was generated layer-by-layer,and the inside oolitic cores were difficult to fully magnetize.Kinetic studies showed that the magnetization reduction process mainly fitted the internal-diffusion-control and chemical-reaction-control model,respectively,for coal-and gas-based systems,with activation energy of 127.80 and 36.68 kJ/mol,indicating that the gas-based system was significantly lower than that of the coal-based system. 展开更多
关键词 Oolitic hematite Magnetization roasting Magnetic reduction rate Kinetics
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Reduction and migration behavior of phosphorus in coal-based reduction of high-phosphorus oolitic iron ore 认领 引用
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作者 Meng-Jie Hu De-Qing Zhu +4 位作者 Jian Pan Zheng-Qi Guo Cong-Cong Yang Si-Wei Li Wen Cao 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第3期88-105,共18页
Phosphorus tends to migrate into metallic iron during the direct reduction of high-phosphorus oolitic iron ore,leading to undesirable phosphorus enrichment in metallic iron.However,the underlying reduction and migrati... Phosphorus tends to migrate into metallic iron during the direct reduction of high-phosphorus oolitic iron ore,leading to undesirable phosphorus enrichment in metallic iron.However,the underlying reduction and migration mechanisms remain poorly understood.Phosphorus behavior during coal-based reduction was systematically investigated through theoretical modeling and experimental approaches.Thermodynamic analysis revealed that the carbon reduction of solid Ca3(PO4)2to gaseous P2requires temperatures exceeding 1400℃.Notably,this threshold significantly decreases to 1130.5℃in the presence of SiO2and Al2O3.Further investigations demonstrated that Ca3(PO4)2co-reduces with FexOγin the presence of SiO2-Al2O3-FexOγ,forming Fe3P(instead of gaseous P2)at a markedly lower temperature of 778.7℃.Mechanistic studies indicate that the inherent thermal stability of Ca3(PO4)2inhibits the generation of reactive[P2O5].However,SiO2-Al2O3coexistence destabilizes Ca3(PO4)2while exponentially enhancing[P2O5]activity.This synergistic effect dramatically promotes the phosphorus mineral reduction.Characterization confirmed that Ca3(PO4)2migrated into the slag phase(4FeO·Al2O3·3SiO2·CaO·P2O5).Subsequently,the reactive P2O5in slag is reduced with metallic iron to form Fe3P,which further dissolves into theα-Fe matrix through solid-state diffusion,ultimately generating Fe-P solid solutions. 展开更多
关键词 Oolitic hematite ore Coal-based reduction Migration behavior Dephosphorization
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A new oolitic content test method for green sand by repeated approximation 认领 引用 被引量：1
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作者 Yu-yang Qi Jian-xin Zhou +6 位作者 Xin Peng Si-yuan Pan Ya-jun Yin Xiao-yuan Ji Yuan-cai Li Peng-fei Lin Peng Wan 《China Foundry》 SCIE EI CAS CSCD 2025年第6期701-709,共9页
The reuse of green sand in casting production is hindered by the accumulation of oolitic deposits,primarily composed of clay binder with surface degradation,which may adversely affect the the moulding sand performance... The reuse of green sand in casting production is hindered by the accumulation of oolitic deposits,primarily composed of clay binder with surface degradation,which may adversely affect the the moulding sand performance.Currently,there is a lack of standardized methods for quantifying the oolitic content.Accurate measurement of oolitic content is of great significance to the reuse of green sand.Attempts to determine oolitic content using potassium hydroxide(KOH)and phosphoric acid(H3PO4)methods encounter challenges due to their excessive reactions with SiO2 in the sand.In this study,an improved method for measuring the oolitic content of green sand with repeated approximations was proposed.This method judges the chemical activity of the sample surface through the change of its mass to accurately obtain the mass of the reaction oolitic deposits.The test result of the used sand samples from the foundry shows that the oolitic deposits are completely removed after reacting with KOH solution three times at 300℃ for 20 min.SEM and EDS also show that after three times of reactions,the surface of green sand becomes smooth and the content of Al-containing oolitic deposits is very low.This indicates that the method can accurately control the extent of the reaction.Implementation of this method at Huangshi Dongbei Casting Co.,Ltd.has yielded consistent and reliable test results,effectively mirroring variations in green sand oolitic content on the production line.This new method is expected to be widely adopted to improve the efficiency and quality of reused green sand in casting operations. 展开更多
关键词 green sand oolitic content repeated approximation reuse of green sand
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Iron recovery and dephosphorization behaviors from high-phosphorus oolitic hematite by gas-based direct reduction and magnetic separation 认领 引用
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作者 Fang Liu Yi-chi Zhang +6 位作者 Wang Zeng Jun Ni Yun-peng Si Heng Zhou Tian-xiang Zhang Sheng-li Wu Ming-yin Kou 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第3期550-563,共14页
With the depletion of high-quality iron ore resources,high-phosphorus oolitic hematite(HPOH)has attracted great attention due to its large reserve and relatively high iron content.However,HPOH is very difficult to be ... With the depletion of high-quality iron ore resources,high-phosphorus oolitic hematite(HPOH)has attracted great attention due to its large reserve and relatively high iron content.However,HPOH is very difficult to be used in ironmaking process due to its special structure.A two-step method of gas-based direct reduction and magnetic separation was thus proposed to recover iron and reduce phosphorus.The results showed that the powdery reduced iron produced contained 92.31%iron and 0.1%phosphorus,and the iron recovery was 92.65%under optimum reduction condition,which is suitable for following steelmaking.The apatite will be reduced under long reduction time and a large reducing gas flow rate,resulting in more phosphorus found in the metallic iron.Increasing the hydrogen–carbon ratio will inhibit the formation and growth of iron particles and prevent the breakage of oolitic structure.Careful adjustment of reduction temperature is recommended as it affects the oolitic structure and reduction. 展开更多
关键词 High-phosphorus oolitic hematite Iron recovery Dephosphorization Gas-based direct reduction Magnetic separation
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Recovery of iron from high phosphorus oolitic iron ore using coal-based reduction followed by magnetic separation 认领 引用 被引量：51
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作者 Yong-sheng Sun Yue-xin Han +2 位作者 Peng Gao Ze-hong Wang Duo-zhen Ren 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2013年第5期411-419,共9页
Oolitic iron ore is one of the most important iron resources. This paper reports the recovery of iron from high phosphorus oolitic iron ore using coal-based reduction and magnetic separation. The influences of reducti... Oolitic iron ore is one of the most important iron resources. This paper reports the recovery of iron from high phosphorus oolitic iron ore using coal-based reduction and magnetic separation. The influences of reduction temperature, reduction time, C/O mole ratio, and CaO content on the metallization degree and iron recovery were investigated in detail. Experimental results show that reduced products with the metallization degree of 95.82% could be produced under the optimal conditions （i.e., reduction temperature, 1250℃; reduction time, 50 min; C/O mole ratio, 2.0; and CaO content, 10wt%）. The magnetic concentrate containing 89.63wt% Fe with the iron recovery of 96.21% was obtained. According to the mineralogical and morphologic analysis, the iron minerals had been reduced and iron was mainly enriched into the metallic iron phase embedded in the slag matrix in the form of spherical particles. Apatite was also reduced to phosphorus, which partially migrated into the metallic iron phase. 展开更多
关键词 oolitic iron ore iron ore reduction magnetic separation phosphorus
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Mechanism of phosphorus removal in beneficiation of high phosphorous oolitic hematite by direct reduction roasting with dephosphorization agent 认领 引用 被引量：33
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作者 徐承焱 孙体昌 +3 位作者 寇珏 李永利 莫晓兰 唐利刚 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第11期2806-2812,共7页
High phosphorous oolitic hematite ore is one of typical intractable iron ores in China, and the conventional beneficiation methods are found to be impracticable to , remove phosphorus from the ore effectively. Better ... High phosphorous oolitic hematite ore is one of typical intractable iron ores in China, and the conventional beneficiation methods are found to be impracticable to , remove phosphorus from the ore effectively. Better beneficiation index were gotten by direct reduction roasting with dephosphorization agent followed by two stages of grinding and magnetic separation. P content decreases from 0.82% in the raw ore to 0.06% in the magnetic concentrate, and the total iron grade increases from 43.65% to 90.23%, the recovery of iron can reach 87%. Mechanisms of phosphorus removal in the beneficiation of high phosphorous oolitic hematite ore by direct reduction roasting with dephosphorization agent were studied using XRD, SEM and EPMA. The results showed that about 20% of the apatite in the raw ore transferred into phosphorus and volatilized with the gas in the process of reduction roasting, while the rest 80% apatite was not involved in the reaction of generation of phosphorus, and remained as apatite in the roasted products, which was removed to tailings by grinding and magnetic separation. A small amount of phosphorus existed in the magnetic concentrate as apatite. The oolitic texture of raw ore was partly changed during roasting, resulting in the formation of nepheline in the reaction between the dephosphorization agent, SiO2 and Al2O3 in the raw ore, which greatly improved the liberation degree of minerals in the roasted products, and it was beneficial to the subsequent grinding and magnetic separation. 展开更多
关键词 high phosphorous oolitic hematite direct reduction roasting phosphorus removal -dephosphorization agent grinding magnetic separation
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Strengthening iron enrichment and dephosphorization of high-phosphorus oolitic hematite using high-temperature pretreatment 认领 引用 被引量：21
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作者 Wen-tao Zhou Yue-xin Han +1 位作者 Yong-sheng Sun Yan-jun Li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2020年第4期443-453,共11页
The efficient development and utilization of high-phosphorus oolitic hematite is of great strategic significance for the sustainable supply of iron-ore resources in China.In this paper,the mechanism of high-temperatur... The efficient development and utilization of high-phosphorus oolitic hematite is of great strategic significance for the sustainable supply of iron-ore resources in China.In this paper,the mechanism of high-temperature pretreatment for enhancing the effect of iron enrichment and dephosphorization in the magnetization roasting–leaching process was studied by X-ray diffraction(XRD),vibration sample magnetometer(VSM),scanning electron microscopy and energy dispersive spectrometry(SEM–EDS).Compared with the process without high-temperature pretreatment,the iron grade of the magnetic separation concentrate after high-temperature pretreatment had increased by 0.98%,iron recovery rate had increased by 1.33%,and the phosphorus content in the leached residue had decreased by 0.12%.High-temperature pretreatment resulted in the dehydration and decomposition of hydroxyapatite,the dehydration of limonite and the thermal decomposition of siderite,which can produce pores and cracks and weaken the compactness of the ore,improve the magnetization characteristics of roasted ore,and strengthen the iron enrichment and dephosphorization during the magnetization roasting and leaching process. 展开更多
关键词 high-phosphorus oolitic hematite high-temperature pretreatment iron enrichment and dephosphorization magnetization roasting–leaching process phase transformation
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Primary Intergranular Pores in Oolitic Shoal Reservoir of Lower Triassic Feixianguan Formation,Sichuan Basin,Southwest China:Fundamental for Reservoir Formation and Retention Diagenesis 认领 引用 被引量：27
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作者 Tan Xiucheng Liu Hong +5 位作者 Li Ling Luo Bing Liu Xiaoguang Mou Xiaohui Nie Yong Xi Wenyan 《Journal of Earth Science》 SCIE EI CAS CSCD 2011年第1期101-114,共14页
The Lower Triassic Feixianguan(飞仙关)Formation oolitic shoal reservoir in the Sichuan(四川)basin(Southwest China)is currently an exploration and research highlight in China.The reservoir is widely believed to be form... The Lower Triassic Feixianguan(飞仙关)Formation oolitic shoal reservoir in the Sichuan(四川)basin(Southwest China)is currently an exploration and research highlight in China.The reservoir is widely believed to be formed mainly by burial dissolution and/or dolomitization on the basis of primary intergranular pores.In this study,through a comprehensive geological study on the whole basin,the dissolution and dolomitization are suggested not to be the fundamental factor of reservoir formation and there thus may be a possible new fundamental mechanism-the preservation of primary intergranular pores,i.e.,the retention diagenesis.Based on this,a complex and multi-stage reservoir evolution and formation model is proposed.In the model,the depositional environment is the basis of reservoir initial formation.Subsequently,early compaction and shallow burial cementation result in the primary reservoir differentiation.Then,multi-stage burial dissolution alters and adjusts the reservoir.Because the last stage gaseous hydrocarbons have little diagenetic impact,the reservoir is formed finally.Therefore,this study presents a possible new fundamental mechanism and evolution model for the reservoir formation.The results can be applied in the regional reservoir predication and shaping exploration strategies,and provide reference for the study of shoal reservoirs in other areas. 展开更多
关键词 carbonate reservoir oolitic shoal,primary intergranular pore retention diagenesis,burial dissolution dolomitization Lower Trias-sic Feixianguan Formation Sichuan basin.
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Iron Extraction From Oolitic Iron Ore by a Deep Reduction Process 认领 引用 被引量：28
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作者 LI Ke-qing NI Wen +2 位作者 ZHU Ming ZHENG Mei-juan LI Yuan 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2011年第8期9-13,共5页
A laboratory experiment was carried out to extract iron from oolitic iron ore by a deep reduction and magnetic separation technique.The raw coal with fixed carbon of 66.54%was used as the reductant.The iron was succes... A laboratory experiment was carried out to extract iron from oolitic iron ore by a deep reduction and magnetic separation technique.The raw coal with fixed carbon of 66.54%was used as the reductant.The iron was successfully extracted from the oolitic iron ore which otherwise is nearly impossible to be separated due to its extremely fine-grain and mosaic nature.The results showed that an iron recovery rate of 90.78%and an iron content of 92.53~of iron concentrate could be obtained by such a technique.The optimized roast temperature is 1200℃and time is 60 min.The subsequent magnetic separation was performed by using a magnetic field intensity of 111 kA·m^-1 and a grinding fineness less than 45μm of 96.19%for the sintered product. 展开更多
关键词 oolitic hematite deep reduction magnetic separation
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Effect of coal levels during direct reduction roasting of high phosphorus oolitic hematite ore in a tunnel kiln 认领 引用 被引量：29
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作者 Li Yongli Sun Tichang +1 位作者 Zou Anhua Xu Chengyan 《International Journal of Mining Science and Technology》 EI CAS 2012年第3期323-328,共6页
The effect of coal levels on phosphorus removal from a high phosphorus oolitic hematite ore after direct reduction roasting have been investigated.Raw ore,coal,and a dephosphorizatiou agent were mixed and the mixture ... The effect of coal levels on phosphorus removal from a high phosphorus oolitic hematite ore after direct reduction roasting have been investigated.Raw ore,coal,and a dephosphorizatiou agent were mixed and the mixture was then roasted in a tunnel kiln.The roasted products were treated by two stages of grind-ing followed by magnetic separation.XRD and SEM-EDS examination of the products was used to analyze differences in the roasted products.The results show that coal is one of the most important factors affect-ing the direct reduction roasting process.When the inner coal levels increased from 0%to 15%the iron grade decreased linearly from 94.94%to 88.81%and the iron recovery increased from 55.94%to 92.94%.At the same time the phosphorus content increased from 0.045%to 0.231%.Increasing the inner coal levels also caused more hematite to be reduced to metallic iron but the oolitic structure of the roasted product was preserved in the presence of high coal loading.The phase of the phosphorus in raw ore was not changed after direct reduction roasting.The effect of coal on the phosphorus content in the H-concentrate arises from changes in the difficulty of mechanically liberating the metallic iron from the phosphorus bearing minerals. 展开更多
关键词 High phosphorus oolitic hematite Direct reduction roasting Removal phosphorus Magnetic separation
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Mechanism of microwave assisted suspension magnetization roasting of oolitic hematite ore 认领 引用 被引量：11
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作者 ZHOU Wen-tao SUN Yong-sheng +2 位作者 HAN Yue-xin GAO Peng LI Yan-jun 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第2期420-432,共13页
Oolitic hematite is an iron ore resource with rich reserves,complex composition,low grade,fine disseminated particle sizes,and a unique oolitic structure.In this study,a microwave-assisted suspension magnetization roa... Oolitic hematite is an iron ore resource with rich reserves,complex composition,low grade,fine disseminated particle sizes,and a unique oolitic structure.In this study,a microwave-assisted suspension magnetization roasting technology was proposed to recover and utilize the ore.The results showed that under the conditions of microwave pretreatment temperature of 1050℃ for 2 min,a magnetic concentrate with an iron grade of 58.72%at a recovery of 89.32%was obtained by microwave suspension magnetization roasting and magnetic separation.Moreover,compared with the no microwave pretreatment case,the iron grade and recovery increased by 3.17%and 1.58%,respectively.Microwave pretreatment increased the saturation magnetization of the roasted products from 24.974 to 39.236(A∙m2)/kg and the saturation susceptibility from 0.179×10−3 m3/kg to 0.283×10−3 m3/kg.Microcracks were formed between the iron and gangue minerals,and they gradually extended to the core of oolite with the increase in the pretreatment time.The reducing gas diffused from outside to inside along the microcracks,which promoted the selective transformation of the weak magnetic hematite into the strong magnetic magnetite. 展开更多
关键词 oolitic hematite microwave suspension magnetization roasting phase and magnetic transformation microstructure evolution
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Comparison of basic features and origins of oolitic shoal reservoirs between carbonate platform interior and platform margin locations in the Lower Triassic Feixianguan Formation of the Sichuan Basin,southwest China 认领 引用 被引量：9
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作者 Tan Xiucheng Zhao Luzi +6 位作者 Luo Bing Jiang Xingfu Cao Jian Liu Hong Li Ling Wu Xingbo Nie Yong 《Petroleum Science》 SCIE CAS CSCD 2012年第4期417-428,共12页
The oolitic shoal reservoirs of the Lower Triassic Feixianguan Formation carbonates in the Sichuan Basin of southwest China are an important target for gas exploration in the basin.Their occurrence,like other cases wo... The oolitic shoal reservoirs of the Lower Triassic Feixianguan Formation carbonates in the Sichuan Basin of southwest China are an important target for gas exploration in the basin.Their occurrence,like other cases worldwide,can be divided into two locations in general,i.e.,platform interior and platform margin locations.Their differences of reservoir features and origins,however,have not been investigated comprehensively due to different exploration degrees.This issue is addressed in this paper,to provide basic data and information for the basin＇s hydrocarbon exploration and for the study of carbonate platform sedimentology and reservoir geology worldwide.We compared the features of these two types of reservoirs in detail,including the depositional and diagenetic features,pore types and petrophysical features.Based on the comparison,the origin of the reservoirs was further discussed.It is shown that the reservoirs in platform interior and platform margin locations differ significantly.The interior carbonates were deposited in moderate to high energy settings and the dominant lithologic type was limestone,which was weakly compacted and intensely cemented and has undergone meteoric dissolution.Pore types include intragranular dissolution and moldic pores,with low porosities（6%） and low permeabilities（0.1 mD）.By contrast,the platform margin carbonates were deposited in relatively high energy settings and mainly consisted of dolostones with some limestones.The rocks were strongly compacted but incompletely cemented.As a result,some primary intergranular pores were preserved.Both meteoric solution and burial solution have taken place.There are various types of pore spaces including intergranular and intercrystalline solution pores and residual intergranular pores.This type of reservoir generally has better petrophysical properties（9% porosity and 0.1 mD permeability） and pore-throat structures than the interior reservoirs.These differences were influenced by both primary depositional features and secondary diagenesis.For the interior carbonate reservoirs,early meteoric dissolution,weak compaction and strong cementation are important controlling factors.By contrast,the factors controlling the formation of the margin carbonate reservoirs mainly include dolomitization,preservation of primary pores and burial dissolution. 展开更多
关键词 Carbonate platform oolitic shoal reservoir platform margin platform interior Lower Triassic Feixianguan Formation Sichuan Basin China
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Phase transformation in suspension roasting of oolitic hematite ore 认领 引用 被引量：11
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作者 李艳军 王儒 +1 位作者 韩跃新 魏新超 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第12期4560-4565,共6页
Suspension roasting followed by magnetic separation is a promising method to upgrade oolitic hematite ore.An oolitic hematite ore was roasted using suspension roasting technology at different temperatures.The phase tr... Suspension roasting followed by magnetic separation is a promising method to upgrade oolitic hematite ore.An oolitic hematite ore was roasted using suspension roasting technology at different temperatures.The phase transformation for iron minerals was investigated by XRD and Mossbauer spectrum,and the characteristics of roasted product were analyzed by VSM and SEM-EDS.Results indicate that the magnetic concentrate is of 58.73% Fe with iron recovery of 83.96% at 650 °C.The hematite is rapidly transformed into magnetite during the roasting with transformation ratio of 92.75% at 650 °C.Roasting temperature has a significant influence on the phase transformation of hematite to magnetite.The transformation ratio increases with increased temperature.After roasting,the magnetic susceptibility is significantly improved,while iron ore microstructure is not altered significantly. 展开更多
关键词 oolitic hematite ore suspension roasting Mossbauer spectrum magnetic property phase transformation
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Application of multi-stage dynamic magnetizing roasting technology on the utilization of cryptocrystalline oolitic hematite:A review 认领 引用 被引量：9
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作者 Hanquan Zhang Pengfei Zhang +1 位作者 Feng Zhou Manman Lu 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2022年第4期865-876,共12页
A large number of studies have shown that oolitic hematite is an iron ore that is extremely difficult to utilize because of its fine disseminated particle size,high harmful impurity content and oolitic structure.To re... A large number of studies have shown that oolitic hematite is an iron ore that is extremely difficult to utilize because of its fine disseminated particle size,high harmful impurity content and oolitic structure.To recover iron from oolitic hematite,we developed a novel multistage dynamic magnetizing roasting technology.Compared with traditional magnetizing roasting technologies,this novel technology has the following advantages:firstly,the oolitic hematite is dynamically reduced in a multi-stage roasting furnace,which shortens the reduction time and avoids ringing and over-reduction;secondly,the novel dynamic magnetizing roasting technology has strong raw material adaptability,and the size range of raw materials can be as wide as 0–15 mm;thirdly,the roasting furnace adopts a preheating-heating process,and the low-calorific value blast furnace gas can be used as the fuel and reductant,which greatly reduces the cost.The actual industrial production data showed that the energy consumption in the roasting process can be less than 35 kg of standard coal per ton of raw ore.The iron grade of the concentrate and iron recovery reached 65%and 90%,respectively. 展开更多
关键词 Oolitic hematite ore Magnetizing roasting Reduction kinetics Over-reduction Iron mineralogy
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Migration behaviors and kinetics of phosphorus during coal-based reduction of high-phosphorus oolitic iron ore 认领 引用 被引量：7
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作者 Yong-sheng Sun Yan-feng Li +1 位作者 Yue-xin Han Yan-jun Li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2019年第8期938-945,共8页
To understand the migration mechanisms of phosphorus(P)during coal-based reduction,a high-phosphorus oolitic iron ore was reduced by coal under various experimental conditions.The migration characteristics and kinetic... To understand the migration mechanisms of phosphorus(P)during coal-based reduction,a high-phosphorus oolitic iron ore was reduced by coal under various experimental conditions.The migration characteristics and kinetics of P were investigated by a field-emission electron probe microanalyzer(FE-EPMA)and using the basic principle of solid phase mass transfer,respectively.Experimental results showed that the P transferred from the slag to the metallic phase during reduction,and the migration process could be divided into three stages:phosphorus diffusing from the slag to the metallic interface,the formation of Fe P compounds at the slag metal interface and P diffusing from the slag metal interface to the metallic interior.The reduction time and temperature significantly influenced the phosphorus content of the metallic and slag phases.The P content of the metallic phase increased with increasing reduction time and temperature,while that of the slag phase gradually decreased.The P diffusion constant and activation energy were determined and a migration kinetics model of P in coal-based reduction was proposed.P diffusion in the metallic phase was the controlling step of the P migration. 展开更多
关键词 high-phosphorus oolitic iron ore coal-based reduction phosphorus migration kinetics
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Effects of Diagenesis on the Acoustic Velocity of the Triassic Oolitic Shoals in the Yudongzi Outcrop of Erlangmiao Area,Northwest Sichuan Basin 认领 引用 被引量：6
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作者 荣辉 焦养泉 +4 位作者 吴立群 顾元 张利亚 李荣 曾凡平 《Journal of Earth Science》 SCIE EI CAS CSCD 2012年第4期542-558,共17页
The oolitic shoals of the Triassic carbonate platform margin in the Yudongzi （鱼洞子） outcrop of Erlangmiao （二郎庙） area in the northwestern Sichuan （四川） basin present a scarce opportunity to quantitatively d... The oolitic shoals of the Triassic carbonate platform margin in the Yudongzi （鱼洞子） outcrop of Erlangmiao （二郎庙） area in the northwestern Sichuan （四川） basin present a scarce opportunity to quantitatively describe their diagenesis and its effects on the acoustic velocity. Using a detailed field geologic survey, profiles illustration of typical depositional system, and systematic testing, five types of diagenesis have been identified in the oolitic shoals： micritization, cementation, compaction and pressolution, dissolution, and dolomitisation. The cementation is composed of four subtypes （micrite cements, fibrous calcite cements, granular calcite cements, and blocky calcite cements）. The dissolution is formed from three subtypes （freshwater selective dissolution, burial non-selective dissolution, and burial selective dissolution）. The dolomitisation is composed of three subtypes （fine-crystalline dolomites, microcrystalline dolomites, and medium-crystalline dolomites）. In order to quantitatively describe the diagenetic fabric of oolitic shoals, the micritic grain content, calcite cement content, mean pore diameter, pore types, dolomite content, and dolomite types have been evaluated. Based on these data, the relationship between the acoustic velocity and diagenesis of oolitic shoals hasbeen established. The results show that the diagenetic fabric is linearly related with the acoustic velocity, and the general trend observed is as expected a decrease of velocity as the micritic grain content, mean pore diameter and dolomite content increase, or the sparite cement content decreases. This study will demonstrate that the transformation of diagenetic facies will probably make the petrophysicai properties ofEffects of Diagenesis on the Acoustic Velocity of the Triassic Oolitic Shoals in the Yudongzi Outcropthe oolitic shoals regularly changed. The reflection configuration of diagenetic facies in the oolitic shoals can be shown in the synthetic seismic model simulated according to the P-wave impedance and S-wave impedance. 展开更多
关键词 oolitic shoal diagenesis acoustic velocity Feixianguan Formation Sichuan basin.
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The Major Controlling Factors and Different Oolitic Shoal Reservoir Characteristics of the Triassic Feixianguan Formation,Eastern Longgang Area,NE Sichuan Basin,SW China 认领 引用 被引量：4
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作者 GU Yifan JIANG Yuqiang +4 位作者 LEI Xiaohua CHEN Zhiyong ZHOU Lu FU Yonghong JIANG Zengzheng 《Acta Geologica Sinica(English Edition)》 SCIE EI CAS CSCD 2021年第3期895-908,共14页
Based on comprehensive analyses of occurrence,petrological observation,pore structure and geochemistry,the different reservoir characteristics and reservoir evolutionary pathways between different oolitic shoal reserv... Based on comprehensive analyses of occurrence,petrological observation,pore structure and geochemistry,the different reservoir characteristics and reservoir evolutionary pathways between different oolitic shoal reservoir types of the Feixianguan Formation on the west side of the Kaijiang-Liangping Trough have been studied.There exist three stages of high-energy slope break belts in the Feixianguan period,the corresponding three stages of oolitic shoals gradually migrating in the direction of the trough.Three types of oolitic shoal reservoirs,namely,residual-oolitic dolomite,mold-oolitic dolomite and sparry oolitic limestone,were formed during sedimentary-diagenetic evolution,the pore types being intergranular dissolved pore,mold pore(or intragranular dissolved pore)and residual intergranular pore,respectively.The petrology,physical properties and pore structure of the different types of oolitic shoal reservoirs are quite different.Residual-oolitic dolomite reservoirs have the best quality,while sparry oolitic limestone reservoirs have the poorest.Combined with analyses of trace elements,rare earth elements and carbon-oxygen isotopes,it is suggested that the formation of residual-oolitic dolomite reservoirs is jointly controlled by penesaline seawater seepage-reflux dolomitization and hydrothermal dolomitization.Mold-pore oolitic dolomite reservoirs are controlled by penesaline seawater seepage-reflux dolomitization and meteoric water solution.The burial dissolution of organic acid not only further improves the reservoir qualities of previously formed oolitic dolomite reservoirs,but also preserves residual intergranular pores in the sparry oolitic limestone reservoirs. 展开更多
关键词 oolitic shoal reservoir evolution geochemical characteristics Triassic System Feixianguan Formation Sichuan Basin
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Magnetizing Roasting Mechanism and Effective Ore Dressing Process for Oolitic Hematite Ore 认领 引用 被引量：44
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作者 YU Yongfu QI Chaoying 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第2期177-182,共6页
Magnetizing roasting of oolitic hematite ore from western Hubei Province was investigated.The mechanism for reduction roasting of oolitic hematite ore was discussed and analyzed.It is found that flash magnetizing roas... Magnetizing roasting of oolitic hematite ore from western Hubei Province was investigated.The mechanism for reduction roasting of oolitic hematite ore was discussed and analyzed.It is found that flash magnetizing roasting-magnetic separation process is a promising approach for the processing of oolitic hematite ore from western Hubei Province. 展开更多
关键词 oolitic hematite ore ore dressing magnetizing roasting mechanism
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Reduction of Carbon-bearing Pellets of Oolitic Hematite in a Shaft Furnace 认领 引用 被引量：4
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作者 Wei WU Jian-jun GAO +3 位作者 Jia-qing ZENG Yuan-hong QI Jian-chang WANG Xi-dong ZHANG 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2016年第3期210-219,共10页
When carbon-bearing pellets of oolitic hematite are treated in a shaft furnace,some problems are typically encountered：the metallization ratio of the metal pellets is low;the carbon-bearing pellets bond with each oth... When carbon-bearing pellets of oolitic hematite are treated in a shaft furnace,some problems are typically encountered：the metallization ratio of the metal pellets is low;the carbon-bearing pellets bond with each other at high temperatures;and the separation of phosphorus from iron is difficult.To solve these problems,experiments were conducted on oolitic hematite reduction in a resistance furnace and semi-industrial test shaft furnace.The results showed that the metallization rate reached 90% or greater under the conditions of a reduction temperature of 1 150℃,an atmosphere of simulated flue gas,and a reduction time between 1.5and 2.0h.The problem of high-temperature bonding among pellets can be solved by increasing the strength of the pellets,coating their surface with a surface transfer agent and maintaining an even temperature inside the shaft furnace.The basicity of the ore blend exerted no obvious effect on the magnetic concentrate and phosphorus content.The phosphorus content in the magnetic concentrate can be further reduced by improving the grinding capacity of the ball mills used in the experiments.On the basis of the experimental results related to oolitic hematite reduction with carbon-bearing pellets in a shaft furnace,the experimental requirements were satisfied with an average 88.27%total Fe content and 0.581% P content in the pellets. 展开更多
关键词 oolitic hematite carbon-bearing pellet metallization rate high temperature bonding resistance furnace shaft furnace phosphorus separation
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