期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到468篇文章
< 1 2 … 24 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Life cycle-based environmental comparison and optimization of iron ore pelletizing processes 认领 引用
1
作者 Qiu-Yu Li Yuan-Bo Zhang +3 位作者 Zi-Jian Su Yu-Juan Cai Ke Ma Tao Jiang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第6期432-444,共13页
Pellet ores are recognized as an effective route for energy saving and carbon mitigation in ironmaking,yet systematic life cycle assessment(LCA)of pellet production remains limited.Thus,the environmental impacts and c... Pellet ores are recognized as an effective route for energy saving and carbon mitigation in ironmaking,yet systematic life cycle assessment(LCA)of pellet production remains limited.Thus,the environmental impacts and carbon-reduction potential of optimization measures across different pelletizing processes were quantified using a cradle-to-gate LCA approach.The results indicated that the predominant environmental burdens associated with pellet production were caused by iron concentrate,electricity,fuel,and direct emissions.Overall,the straight grate(SG)process exhibited lower impacts across multiple categories compared to the grate kiln(GK)process.The greenhouse gas(GHG)emissions from SG and GK were 118.51 and 146.78 kg CO2equivalent per 1000 kg of pellet ores,respectively.Sensitivity analysis revealed that iron ore concentrate,fuel,and electricity were the key factors in the pelletizing process.Compared to conventional levels,utilizing secondary resources,optimizing energy structure,and implementing advanced carbon capture and storage technologies could reduce GHG emissions from SG and GK to 32.89%and 34.81%,respectively. 展开更多
关键词 Iron ore pelletizing process Life cycle assessment Straight grate process Grate kiln process Carbon emission reduction
暂未订购 下载PDF
Embedded SCR denitration behavior in chain grate during iron ore pelletizing process: combined influence mechanism of gas components and alkali metal 认领 引用
2
作者 Min Gan Hao Lv +7 位作者 Xiao-hui Fan Yuan Zhu Zhi-yun Ji Zeng-qing Sun Jin-hua Li Xiao-long Wang Lin-cheng Liu Yu-feng Wu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第8期2346-2358,共13页
The implementation of embedded selective catalytic reduction(SCR)denitration in chain grate during iron ore pelletizing process obviates additional flue gas heating.However,the influence of gas components and alkali m... The implementation of embedded selective catalytic reduction(SCR)denitration in chain grate during iron ore pelletizing process obviates additional flue gas heating.However,the influence of gas components and alkali metal on SCR denitration requires attention.The SCR denitration behavior in the preheating section of chain grate was investigated,and the combined influence mechanisms of H2O(g),SO2,and potassium were revealed.The results show that the presence of H2O(g)and SO2 in the flue gas decreases the NO conversion rate of the catalyst from 96.3%to 79.5%,while potassium adsorbed on the catalyst surface further reduces the NO conversion rate to 74.1%.H2O(g),SO2,and potassium in the flue gas form sulfate and potassium salt on the catalyst surface,blocking the pore structure,thereby decreasing the gas adsorption capacity of the catalyst.Moreover,SO2 and potassium engage in competitive adsorption and reaction with NH3 and NO at the active sites on the catalyst surface,reducing the content and activity of the catalyst effective component.Increasing the flue gas temperature can promote the decomposition of ammonium sulfate and ammonium bisulfate on the catalyst surface,but it has little effect on potassium.Additionally,potassium will exacerbate sulfur poisoning of the catalyst.Hence,the embedded SCR denitration process requires electrostatic precipitation to eliminate the adverse impacts of potassium and thermal regime optimization to raise flue gas temperature to 350℃,thereby increasing NO conversion rate exceeding 85%. 展开更多
关键词 Iron ore pellet Chain grate Embedded selective catalytic reduction denitration Gas component Alkali metal potassium Catalyst deactivation
暂未订购 下载PDF
O3oxidation combined with semi-dry method for simultaneous desulfurization and denitrification of sintering/pelletizing flue gas 认领 引用 被引量：15
3
作者 Fagao Liu Maoyu Cai +2 位作者 Xiaolong Liu Tingyu Zhu Yang Zou 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2021年第6期253-263,共11页
With the vigorous development of China's iron and steel industry and the introduction of ultra-low emission policies,the emission of pollutants such as SO2and NO x has received unprecedented attention.Consideri... With the vigorous development of China's iron and steel industry and the introduction of ultra-low emission policies,the emission of pollutants such as SO2and NO x has received unprecedented attention.Considering the increase of the proportion of semi-dry desulfurization technology in the desulfurization process,several semi-dry desulphurization technologies such as flue gas circulating fluidized bed(CFB),dense flow absorber(DFA)and spray drying absorption(SDA)are briefly summarized.Moreover,a method for simultaneous treatment of SO2and NOx in sintering/pelletizing flue gas by O3oxidation combined with semidry method is introduced.Meantime,the effects of key parameters such as O3/NO molar ratio,Ca SO3,SO2,reaction temperature,Ca/(S+2 N)molar ratio,droplet size and approach to adiabatic saturation temperature(AAST)on denitrification and desulfurization are analyzed.Furthermore,the reaction mechanism of denitrification and desulfurization is further elucidated.Finally,the advantages and development prospects of the new technology are proposed. 展开更多
关键词 O3 Oxidation Semi-dry method Sintering/pelletizing flue gas Desulfurization and denitrification
暂未订购 下载PDF
Development and mechanism analysis of a highly efficient binder in pelletizing of ilmenite used in electric furnace 认领 引用 被引量：1
4
作者 Feng Chen Yu-feng Guo +2 位作者 Tao Jiang Shuai Wang Fu-qiang Zheng 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2018年第12期1232-1236,共5页
The development and mechanism of a highly efficient binder in pelletizing of ilmenite from Panzhihua,China,were investigated.It shows that both the drop strength of green pellets and compressive strength of dried pell... The development and mechanism of a highly efficient binder in pelletizing of ilmenite from Panzhihua,China,were investigated.It shows that both the drop strength of green pellets and compressive strength of dried pellets were improved when using the mixtures of starch,NaOH and sodium silicate as the adhesive.Adhesive film was formed on the surface of particles as the function of sodium silicate,promoting the filling of gelatinized starch between the adhesive films to bond the particle tightly.The drop strength of green pellet was 1.3 times/(pellet 700 mm),and the compressive strength of dried pellet of 250℃ was 1825 N/pellets when 0.5 wt%NaOH,1.0 wt% sodium silicate and 2.0 wt% starch were added as adhesive. 展开更多
关键词 Binder Ilmenite Pelletizing Adhesive film Gelatinization
暂未订购 下载PDF
Gas Flow Distribution in Pelletizing Shaft Furnace 认领 引用 被引量：2
5
作者 CAI Jiu-ju DONG Hui +1 位作者 WANG Guo-sheng YANG Jun 《Journal of Iron and Steel Research International》 SCIE CAS 2006年第6期16-20,共5页
Through thermal test, cold state experiment, analysis and simulation of thermal process, the gas flow distribution in pelletizing shaft furnace （PSF） was discussed. The results show that there are five flowing trend... Through thermal test, cold state experiment, analysis and simulation of thermal process, the gas flow distribution in pelletizing shaft furnace （PSF） was discussed. The results show that there are five flowing trends among them, the downward roasting gas and the upward cooling gas are the most unsteady, which influence flow distribution greatly. Among the operating parameters, the ratio of inflow is a key factor affecting the flow distribution. The roasting and cooling gases will entirely flow into the roasting zone and internal vertical air channels （IVAC）, respectively, if the ratio of inflow is critical. From such a critical operating condition increasing roasting gas flow or decreasing cooling gas flow, the roasting gas starts flowing downwards so as to enter the inside of IVAC the greater the ratio of inflow, the larger the downward flowrate. Among constructional parameters, the width of roasting zone b1, width of IVAC b2 and width of cooling zone b3, and the height of roasting zone h1, height of soaking zone h2 and height of cooling zone hs are the main factors affecting flow distribution. In case the ratio of b2/b3, or h3/h2, or h1/h2 is increased, the upward cooling gas tends to decrease while the downward roasting gas tends to increase with a gradual decrease in the ratio of inflow. 展开更多
关键词 pellet shaft furnace fixed bed packed bed gas flow
暂未订购 下载PDF
Fundamental Study on the Production of "Hyper Wood Pellet"——Effect of Torrefaction Condition on Grinding and Pelletizing Properties 认领 引用 被引量：1
6
作者 Takahiro Yoshida Tetsuya Sano +3 位作者 Takashi Nomura Hideki Gensai Hiroki Watada Seiji Ohara 《Journal of Energy and Power Engineering》 CAS 2013年第4期705-710,共6页
In order to upgrade the conventional wood pellet, Japanese softwood and hardwood chips were torrefied at around 200-350℃, and pelletized. The characteristics of the torrefied material/pellets such as their calorific ... In order to upgrade the conventional wood pellet, Japanese softwood and hardwood chips were torrefied at around 200-350℃, and pelletized. The characteristics of the torrefied material/pellets such as their calorific value, grinding energy, pelletizing energy and elemental composition, were also evaluated in this study. The calorific value rose with increasing torrefaction temperature and exceeded 25 MJ/kg （an increase of nearly 40% compared to the untreated state） for torrefaction at around 350℃. The grinding energy greatly decreased with increasing torrefaction temperature, and the reduction was larger for Japanese oak hardwood chips. The pelletization energy for the torrefied material tended to be slightly smaller than in the untreated case. People named such torrefied pellet as ＂hyper wood pellet＂. 展开更多
关键词 Wood pellets torrefaction calorific value.
暂未订购 下载PDF
Viscoelastic behavior in rheological characterization of a coal-based colloidal composite binder 认领 引用
7
作者 Rui Song Xin Zhang +5 位作者 Jin Zhang Guang-Hui Li Xiao-Guang Bai Cheng-Zhi Wei Ming-Jun Rao Tao Jiang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第7期263-275,共13页
The rheological properties of a coal-based colloidal composite binder(3Co-binder)with emphasis on viscoelastic behavior were investigated.Dynamic oscillatory rheometry integrated with the time-temperature superpositio... The rheological properties of a coal-based colloidal composite binder(3Co-binder)with emphasis on viscoelastic behavior were investigated.Dynamic oscillatory rheometry integrated with the time-temperature superposition(TTS)principle was employed to analyze the evolution of viscoelastic moduli(storage modulus and loss modulus)under varying temperatures,frequencies,and time,revealing the mechanistic link between microscopic network structures and macroscopic rheological responses.The 3Co-binder exhibits a wide linear viscoelastic region(up to 14.7%shear strain amplitude),indicating superior resistance to shear-induced structural damage.The viscoelastic moduli decrease significantly with rising temperature,accompanied by irreversible thermal hysteresis,necessitating the avoidance of thermal cycling applications.Frequency sweep tests demonstrate that high-viscosity binders exhibit enhanced resistance to shear-induced structural damage under high-frequency shear(80-100 rad s−1).The generalized Maxwell model(four-order)successfully fitted the frequency-dependent viscoelastic response,uncovering characteristics of multiple relaxation time.The approximate value between the structural activation energy and viscous flow activation energy of the binder endows it with both exceptional shear-thinning properties and self-healing functionalities.As the apparent viscosity of the binder increases from 2411 to 8041 mPa s,the structural relaxation activation energy increases from 51.05 to 62.66 kJ/mol.Cryogenic scanning electron microscopy analysis further confirmed that high-viscosity binders form a dense three-dimensional network structure,enhancing mechanical strength at the expense of dispersibility. 展开更多
关键词 Binder Colloidal solution Viscoelastic behavior Pelletizing Rheological characterization
暂未订购 下载PDF
Engineering self-assembled pellet adsorbents for energy-efficient subambient direct air capture 认领 引用
8
作者 Ronghuan Xu Seonggon Kim +3 位作者 Seongheon Kim Hyungseop Ahn Hyoun Soo Kim Yong Tae Kang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第8期734-742,I0017,共9页
Direct air capture(DAC)requires sorbents that combine mechanical robustness,scalable manufacturability,and high capture efficiency under ultra-dilute CO2conditions.However,a persistent gap remains between promising... Direct air capture(DAC)requires sorbents that combine mechanical robustness,scalable manufacturability,and high capture efficiency under ultra-dilute CO2conditions.However,a persistent gap remains between promising powder chemistries and deployment-ready structured adsorbents capable of translating laboratory-scale material performance into device-level operation under realistic atmospheric conditions—particularly at sub-ambient temperatures,where adsorption thermodynamics and transport behavior fundamentally shift.This study establishes an integrated materials-to-system framework bridging scale-ready pellet fabrication,multiscale transport analysis,and system-level performance evaluation.Integrating carbon nanotubes(CNTs)with silica nanoparticles yields mechanically resilient,mass-producible pellets that convert powder chemistries into fixed-bed-compatible architectures while retaining high CO2capacity(1.78 mmol g-1 at 25℃,adsorption isotherm),whereas the dynamic uptake reaches 1.279 mmol g-1 after 6 h in 400 ppm CO2at 38.5℃.Pellet-scale adsorption analysis establishes characteristic length as a governing architectural parameter that regulates effective kinetics in structured sorbents,thereby defining quantitative design criteria for optimizing device-level capture performance rather than merely maximizing intrinsic material uptake rates.Crucially,fixed-bed performance is systematically evaluated across sub-ambient temperatures(-10 to 20℃),where adsorption thermodynamics,diffusional transport,and humidity interactions deviate markedly from room-temperature behavior.Incorporating a humidity-dependent correction,a semi-empirical mass transfer model reproduces breakthrough behavior with high fidelity.System-level analysis reveals a specific energy requirement of 0.334–0.684 MJ mol-1 and productivity of 4.59–7.21 mol kg-1 day-1,demonstrating competitive throughput with low energy consumption.Collectively,these results provide a framework that integrates scalable material structuring,mass transfer-informed design,and sub-ambient device-level validation,offering guidance for the development of structured adsorbents in DAC applications. 展开更多
关键词 Direct air capture Mass transfer analysis Pellet adsorbent Self-assembled System optimization Sub-ambient temperature
暂未订购 下载PDF
Improving property of reduced iron powders by ultrapure magnetite pellets 认领 引用
9
作者 Jian Pan Bing Han +4 位作者 Yue Shi De-Qing Zhu Yi-Jun Cao Zheng-Qi Guo Yi-Xing Liao 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第4期414-427,共14页
To address the issues of low process efficiency,high energy consumption,and significant pollution in the traditional Höganäs method for producing reduced iron powder,reduced iron powder for powder metallurgy... To address the issues of low process efficiency,high energy consumption,and significant pollution in the traditional Höganäs method for producing reduced iron powder,reduced iron powder for powder metallurgy was prepared using ultrapure magnetite pellets with various compressive strengths by coal-based reduction-hydrogen reduction method.The results show that pellets with compressive strength of 2500 N/pellet ultimately produce a powder metallurgy iron powder with iron grade of 98.24%,hydrogen loss of only 0.5%,bulk density of 2.38 g cm−3,flow rate of 35.97 s(50 g)−1,and compressibility of 6.41 g cm−3 after reduction for 12 h at a C/Fe mass ratio of 2 and a temperature of 105℃,followed by crushing,fine grinding,and secondary hydrogen reduction at 800℃ for 2 h,meeting the standard for FHY100·240.As the compressive strength of ultrapure magnetite pellets increases,the aggregation of metallic iron grains in the reduced pellets intensifies,the porosity of the pellets decreases,and the structure densifies,resulting in a significant increase in the bulk density of reduced iron powder. 展开更多
关键词 Ultrapure magnetite pellet Coal-based reduction Hydrogen reduction Powder metallurgy iron powder
暂未订购 下载PDF
Optimization strategy for iron ore pellet properties via silicate liquid phase coupled with MgO:regulation of alkali metal migration behavior 认领 引用
10
作者 Ke Ma Jing Yi +2 位作者 Zi-Jian Su Tao Jiang Yuan-Bo Zhang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第5期50-68,共19页
The performance of iron ore pellets was influenced by gangue mineral interactions and alkali metal migration during the oxidation and reduction processes.A novel synergistic strategy was proposed to optimize pellet pr... The performance of iron ore pellets was influenced by gangue mineral interactions and alkali metal migration during the oxidation and reduction processes.A novel synergistic strategy was proposed to optimize pellet properties by regulating the liquid phase content coupled with MgO addition.The effects of SiO2and MgO contents on liquid phase generation,pellet microstructure,compressive strength,reduction swelling index(RSI),and reduction index(RI)were systematically investigated.The results showed that the increasing SiO2content significantly enhanced liquid phase formation,thereby improving compressive strength and reducing RSI,but lowering RI.MgO promoted the formation of MgxFe3-xO4during oxidation,increasing porosity and enhancing RI while slightly compromising mechanical strength.In addition,MgxFe3-xO4reduced the expansion during the initial reduction stage(Fe2O3→Fe3O4).Optimal performance was achieved when the liquid phase content in the roasted pellet was maintained at 11%-13%and MgO at 2.0%-2.6%,with compressive strength exceeding 2500 N,RSI below 20%,and RI above 64%.In addition,doubling the liquid phase content reduced the concentration of alkali metals diffused into the iron oxide lattice by approximately 50%,mitigating the localized precipitation of metallic iron whiskers during the final reduction stage(FexO→Fe).Alkali metal doped into iron oxides during oxidation had a more pronounced effect on swelling behavior than the reduction process.These findings offered practical insights into high-performance pellet production under industrial conditions. 展开更多
关键词 Iron ore pellet Liquid phase MgO Alkali metal migration Metal iron growth
暂未订购 下载PDF
Reducing bentonite usage in iron ore pelletization through synergistic modification with mechanical force and DMSO:Effects and mechanisms 认领 引用
11
作者 Yinrui Dong Yongbin Yang +4 位作者 Lin Wang Qianqian Duan Qian Li Yan Zhang Tao Jiang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第1期177-190,共14页
Bentonite is a necessary binder in producing pellets.Its excessive use reduces the iron grade of pellets and increases production costs.Minimizing bentonite dosage is essential for producing high-quality iron ore pell... Bentonite is a necessary binder in producing pellets.Its excessive use reduces the iron grade of pellets and increases production costs.Minimizing bentonite dosage is essential for producing high-quality iron ore pellets.Addressing the gap in the application of organically-intercalated modified bentonite in the pelletizing field,this study introduces an innovative modification process for bentonite that employs the synergistic effect of mechanical force and dimethyl sulfoxide to enhance the intercalation of organic compounds within bentonite,thus significantly enhancing its binding performance.The colloid value and swell capacity of modified bentonite(98.5 m L/3g and 55.0 m L/g)were much higher than the original bentonite(90.5 m L/3g and 17.5 m L/g).With the decrease of bentonite dosage from1.5wt%to 1.0wt%,the drop number of green pellets from a height of 0.5 m and the compressive strengths of roasted pellets using the modified bentonite(6.0 times and 2916 N per pellet)were significantly higher than those of the original bentonite(4.0 times and 2739 N per pellet).This study provides a comprehensive analysis of the intercalation modification mechanism of bentonite,offering crucial technical insights for the development of high-performance modified bentonite as iron ore pellet binders. 展开更多
关键词 pellets bentonite modification mechanical force dimethyl sulfoxide organic intercalation
暂未订购 下载PDF
Oxidation consolidation of vanadium-titanium magnetite pellets strengthened by pretreatment of high-pressure grinding rolls 认领 引用
12
作者 Huan Zhong Tie-Jun Chen +3 位作者 Xian-lin Zhou Jun-Ying Wan Xiang-Bo Jiang Yue Hu 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第1期248-260,共13页
The production of vanadium-titanium magnetite(VTM)pellets has the problems of low consolidation strength and high energy consumption in the preheating and roasting process.High-pressure grinding roll(HPGR)pretreatment... The production of vanadium-titanium magnetite(VTM)pellets has the problems of low consolidation strength and high energy consumption in the preheating and roasting process.High-pressure grinding roll(HPGR)pretreatment process was used to increase the fine-grained content and specific surface area of VTM concentrates,to strengthen the oxidation consolidation process of VTM pellets,and oxidation kinetic experiments were carried out.The results showed that the specific surface area of VTM concentrates was increased from 872 to 1457 cm2/g by HPGR and then pelletising and roasting.With preheating at 1000℃ for 10 min and roasting at 1260℃ for 10 min,the strengths of preheated pellets were increased from 329 to 535 N,and the strengths of roasted pellets were increased from 1010 to 2591 N.The limiting link in the early stage of VTM pellets oxidation was the control of chemical reaction,while the limiting link in the later stage of oxidation was the mixed control of chemical reaction and gas diffusion.The activation energies of VTM pellets before and after HPGR pretreatment were 53.07 and 40.03 kJ/mol in the early stage of oxidation reaction,while the activation energies in the later stage of oxidation were 29.24 and 22.75 kJ/mol,respectively. 展开更多
关键词 Vanadium-titanium magnetite High-pressure grinding roll Pellet consolidation Microstructure Oxidation kinetics
暂未订购 下载PDF
Coupled effect of SiO2 content and hydrogen-enriched atmospheres on the reduction behavior and microstructural evolution of fired hematite pellets 认领 引用
13
作者 Bohua Li Deqing Zhu +3 位作者 Zhengqi Guo Jian Pan Congcong Yang Siwei Li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第6期1925-1937,共13页
As demand grows for low-carbon ironmaking,it is essential to understand how hydrogen reduces iron ore pellets under vary-ing gangue compositions and gas atmospheres.In this work,fired hematite pellets with a basicity(... As demand grows for low-carbon ironmaking,it is essential to understand how hydrogen reduces iron ore pellets under vary-ing gangue compositions and gas atmospheres.In this work,fired hematite pellets with a basicity(mass ratio of CaO to SiO2)of 0.3 and SiO2contents ranging from 1wt%to 4wt%were systematically investigated under three typical shaft furnace atmospheres(Midrex,HYL,and coke oven gas(COG))as well as under 100%H2,to clarify the reduction kinetics,reaction mechanism,and microstructural evolution of the fired pellets.The results indicate that a higher hydrogen proportion significantly accelerates the reduction rate of the fired pellets,while an increase in SiO2content generally leads to a decrease in the overall reaction rate.However,the effect of hydrogen concentration on the reduction behavior of the fired pellets varied markedly with their silicon content.For the fired pellets containing 1wt%and 2wt%SiO2,an increase in hydrogen concentration causes deterioration in reduced pellet characteristics,as evidenced by the increase in reduc-tion swelling index from 26.14%to 34.26%and the decrease in cold compressive strength from 110 to 78 N.In contrast,fired pellets with 3wt%and 4wt%SiO2exhibit the opposite trend,with the reduction swelling index decreasing from 15.26%to 9.23%and cold compress-ive strength improving from 179 to 271 N.Kinetics analysis indicates that under 100%H2,the reduction of fired pellets with 1wt%SiO2is governed by a mixed gas-diffusion and uniform reaction model,whereas fired pellets with 4wt%SiO2follow an unreacted core model.These differences in reduction kinetics,reduction behavior,and post-reduction properties are closely associated with the formation of more Al-bearing calcium silicate slag phases in high-SiO2reduced pellets,which strengthen intergranular bonding,buffer phase-trans-formation-induced stress,and promote the evolution of metallic iron from whisker-like to granular or layered morphologies. 展开更多
关键词 hydrogen metallurgy fired pellets silica content reducing atmosphere microstructural evolution iron nucleation behavior
暂未订购 下载PDF
Induration characteristics of high silica magnetite pellets and its metallurgical performance in blast furnace and gas-based shaft furnace 认领 引用
14
作者 Bo-Hua Li Jian Pan +3 位作者 Cong-Cong Yang De-Qing Zhu Zheng-Qi Guo Meng-Jie Xu 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第5期304-316,共13页
Currently,the supply of high Fe grade and low gangue pellet feeds has become increasingly tight due to yearly large-scale consumption of iron ores worldwide,which will inevitably restrict the development of iron ore p... Currently,the supply of high Fe grade and low gangue pellet feeds has become increasingly tight due to yearly large-scale consumption of iron ores worldwide,which will inevitably restrict the development of iron ore pelletizing process and carbon dioxide emissions mitigation of the steel industry.To promote utilization of high silica pellet feeds,the roasting behavior of high silica acid pellets with varying binary basicity(w(CaO)/w(SiO2)=0.01,0.20,0.35,0.50)through the straight-grate process was examined,and its metallurgical performance in blast furnace and gas-based shaft furnace was also evaluated.The results show that all fired pellets achieved optimal strength by roasting at 1225℃ for 10 min at basicity of 0.35.The metallurgical performance tests under blast furnace and Midrex direct reduction conditions indicate that the addition of a proper quantity of calcium flux improves the pellet reducibility and low-temperature reduction degradation performance,decreases the reduction swelling index and narrows the softening and melting range with better bed permeability at desirable basicity of 0.20 and 0.35.However,further increasing the basicity to 0.50 presents negative impacts on the pellet induration characteristics and metallurgical properties due to excessive formation of liquid phase inhibiting interconnection of hematite particles.Thus,the fired pellets exhibit poorer resistance and structural stability to the mechanical stress and lattice transformation during reduction and cooling process. 展开更多
关键词 High silica magnetite concentrate Acid pellet Oxidation Induration characteristic Metallurgical performance Microstructure
暂未订购 下载PDF
Effect of SO2circulation on pellet quality in grate-kiln process 认领 引用
15
作者 Qiu-Yu Li Zi-Jian Su +4 位作者 Ke Ma Yuan-Bo Zhang Xiao-Guang Bai Guo-Wei Fu Tao Jiang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第3期1-15,共15页
High-sulfur iron concentrates emit SO2into the flue gas during pellet induration.To investigate the effect of the SO2cycle on pellet quality in the grate-kiln process,sulfur balance analysis,thermodynamic calcul... High-sulfur iron concentrates emit SO2into the flue gas during pellet induration.To investigate the effect of the SO2cycle on pellet quality in the grate-kiln process,sulfur balance analysis,thermodynamic calculations,and pellet production experiments under simulated flue gas circulation conditions were conducted.The results indicated that SO2circulation inhibited desulfurization and deteriorated pellet strength.SO2absorption increased the pellet sulfur content to 0.70 wt.%during the downdraft drying phase,and the absorption could be aggravated by the moisture.The desulfurization rate of the preheating process was also decreased to 16.67%,resulting from the refractory sulfate generation.Sulfur content of the roasted pellets dropped to 0.13 wt.%because of the aluminosilicate generation.The finished pellet sulfur content further decreased to 0.08 wt.%due to the fresh air during the cooling process.Eventually,optimization measures were proposed when high-sulfur iron concentrates were used for oxidized pellet preparation. 展开更多
关键词 SO2circulation SO2absorption Refractory sulfate Pellet preparation Production optimization
暂未订购 下载PDF
Explainable MRF-BBAPM with self-learning for predicting compressive strength of oxidized pellet 认领 引用
16
作者 Zezheng Li Jue Tang +1 位作者 Mansheng Chu Quan Shi 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第6期1912-1924,共13页
The compressive strength of oxidized pellets is a key indicator for evaluating pellet quality and stability.Accurate prediction of its variation trend is essential for improving production efficiency and optimizing pr... The compressive strength of oxidized pellets is a key indicator for evaluating pellet quality and stability.Accurate prediction of its variation trend is essential for improving production efficiency and optimizing process parameters.However,due to the high dimensionality and strong nonlinearity of compressive strength prediction,existing models still face limitations in terms of reliability,applicability,and generalization.This study proposes the metallurgical-random forest-based Bayesian optimized bidirectional gated recurrent unit(BiGRU)attention prediction model(MRF-BBAPM)model,which employs feature selection guided by metallurgical mechanisms and random forest to enhance model efficiency and relevance.The BiGRU network parameters are optimized using Bayesian optimization,and an attention mechanism is incorporated to focus on critical features,further improving model performance.The SHapley Additive ex-Planations(SHAP)method is introduced to quantify the contribution of each feature to the prediction results,revealing the model’s decision-making process and enhancing its interpretability and reliability.The model also incorporates a self-learning mechanism that automatically updates and optimizes itself based on weekly prediction errors.Experimental results show that the proposed model achieves a mean absolute error of 80.58 N(2.77%of the mean)and a root mean square error of 95.75 N(3.29%of the mean)in predicting pellet compressive strength,demonstrating strong stability and reliability in real-world applications.This method provides effective data support for accurate prediction of pellet compressive strength and informed decision-making in production. 展开更多
关键词 compressive strength of oxidized pellet metallurgical mechanisms random forests Bayesian optimization bidirectional gated recurrent unit SHapley Additive exPlanations
暂未订购 下载PDF
Optimizing Wood Pellet Quality:Physical Properties of Acacia hybrid and Pine Wood Waste for Industrial Applications 认领 引用
17
作者 Faiz Rahman Rafidah Md Salim Janshah Mohktar 《Journal of Renewable Materials》 EI CAS 2026年第2期65-83,共19页
The growing demand for renewable energy has increased the use of wood pellets as a clean and efficient biomass fuel.This study aims to evaluate the physical properties of wood pellets produced from Acacia hybrid(AC)ve... The growing demand for renewable energy has increased the use of wood pellets as a clean and efficient biomass fuel.This study aims to evaluate the physical properties of wood pellets produced from Acacia hybrid(AC)veneer waste and Pine wood(PW)waste mixed with varying ratios.The objectives are to investigate the effect of different blend ratios ofAcacia hybrid veneer waste and pine wood waste on the physical properties,specificallymoisture content,density,and pellet durability index(PDI)of wood pellets,and to identify the optimal ratio that yields the most desirable pellet quality.The wood pellets were produced by blending Acacia hybrid veneer waste and Pine wood waste(AC:PW)in weight ratios of 100:0,75:25,50:50,25:75,and 0:100.The materials were dried to 10%–12%moisture before pelletizing using a pellet mill under consistent pressure and temperature.Moisture content(MC),density(ρ)and pellet durability index(PDI)were measured following the International Organization for Standardization(ISO).The study found that blending Acacia hybrid veneer waste with Pine wood waste significantly improved pellet density and durability compared to the control.The moisture was lowest in pellets with 50:50 and 25:75 blends,indicating better drying and stability.The blend 50:50 achieves the highest density,and for pellet durability index,the best blend is 25:75,suggesting improved resistance to breakage.Overall,the 50:50 and 25:75 ratios produced pellet with the most desirable combination of low moisture,high density,high durability and the blend meets key ISO 17225 and ENplus quality standards for industrial wood pellet. 展开更多
关键词 Wood pellet production mixed wood waste moisture content density pellet durability index(PDI)
暂未订购 下载PDF
Modeling and analysis of pelletization process based on a multi-hole pelletizing device 认领 引用 被引量：1
18
作者 Qinghai Jiang Kai Wu Yu Sun 《International Journal of Agricultural and Biological Engineering》 SCIE 2019年第1期17-23,共7页
A multi-hole pelletizing device(MPD)was proposed to simulate the granular extrusion process of animal feed due to its cheap,fast,and controllable features.The compression mechanism was analyzed and discussed according... A multi-hole pelletizing device(MPD)was proposed to simulate the granular extrusion process of animal feed due to its cheap,fast,and controllable features.The compression mechanism was analyzed and discussed according to the compression force-time curve.This study applied response surface methodology(RSM)with a central composite design(CCD)to develop predictive models for the compression force Fout and the pellet properties which includes pellet densityρp,pellet moisture content Mcp,and pellet tensile strength Dp based on the MPD.The effects of feedstock moisture content Mcf(10%-18%w.b.),feedstock particle size Sf(8 meshes-24 meshes),die temperature Td(70°C-110°C)and compression speed Vc(5 mm/min to 25 mm/min)were investigated.Response surface models developed for the compression force and pellet properties have adequately described the pelleting process(R2>0.95).The results showed the significant effects of all factors and most of the squared and interaction terms on the compression force and pellet physical properties.It can be concluded from the present study that moisture content and die temperature,followed by compression speed and feedstock particle size are the interacting process factors influencing compression force and pellet properties. 展开更多
关键词 animal feed pelletization modeling compression force response surface methodology analysis of variance
Solidification mechanism and harmful elements removal behavior in preparation of sulfuric acid slag pellets 认领 引用 被引量：1
19
作者 Yu-feng Guo Fu-chun Xu +5 位作者 Shuai Wang Feng Chen Ling-zhi Yang Yu Zheng Tao Jiang Guan-zhou Qiu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第10期3202-3219,共18页
Sulfuric acid slag,a common byproduct with high iron content,poses challenges due to its high levels of harmful impurities and is often discarded as solid waste,leading to significant environmental and water pollution... Sulfuric acid slag,a common byproduct with high iron content,poses challenges due to its high levels of harmful impurities and is often discarded as solid waste,leading to significant environmental and water pollution.To address this issue and improve resource utilization,the preparation process of oxidized pellets from sulfuric acid slag was studied,exploring suitable pelletizing systems and thermal parameters.Additionally,the removal of harmful elements and the consolidation mechanism were established during the oxidation roasting process.The findings revealed that sulfuric acid slag along with specific processing conditions,such as using two high-pressure grinding rolls and adding 1.25 wt.%bentonite,resulted in the production of qualified green pellets with desirable physical properties.Through a thermal treatment process involving preheating and roasting,the desulfurization rate of the pellets reached 95.55%and the removal efficiency of arsenic achieved 27.11%.Hematite recrystallizes,shrinks,and forms a reticulated structure with Fe2O3 recrystallization as the backbone,resulting in higher consolidation strength. 展开更多
关键词 Sulfuric acid slag Pellet High-pressure grinding roll Harmful impurity Desulfurization
暂未订购 下载PDF
Time series prediction model for compressive strength of ore pellets produced by straight grate 认领 引用 被引量：1
20
作者 Feng Cao Min Gan +5 位作者 Xiao-hui Fan Xu-ling Chen Zhen-xiang Feng Xiao-xian Huang Zhuo-zhang Liao Cheng-hao Xie 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第8期2320-2333,共14页
The compressive strength of the pellets is a key indicator that determines the production efficiency in straight grate.It usually relies on manual sampling and testing,which is cumbersome and inefficient.To address th... The compressive strength of the pellets is a key indicator that determines the production efficiency in straight grate.It usually relies on manual sampling and testing,which is cumbersome and inefficient.To address this,a time series prediction model for pellet compressive strength was developed,combining a gradient boosting decision tree with a temporal convolutional network(GBDT-TCN).Firstly,the key physical characteristics of the pellet production process were established through the feature construction method,and then the multicollinear features were eliminated based on the Spearman correlation coefficient.The final selection of feature parameters,amounting to 9,was determined using recursive feature elimination(RFE)method.Finally,the GBDT algorithm was used to establish the nonlinear relationship between these features and the compressive strength.The GBDT prediction results and process data were constructed into a time series dataset,which was input into the TCN unit cascade model.The time series information was captured through the distribution coefficient of the loss function in the time series.Results illustrate that the GBDT-TCN method proposed performs well in the task of predicting the compressive strength of pellets.Compared with the prediction model using only GBDT,the accuracy within±100 N is increased from 83.33%to 90.00%. 展开更多
关键词 Straight grate Pellet Compressive strength Multi-feature fusion Prediction GBDT-TCN
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 24 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈