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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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Non-explosive directional fracturing blasting using coal-based solid waste expanding agent 认领 引用 被引量：6
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作者 Quan Zhang Manchao He +7 位作者 Jiong Wang Shan Guo Chao Wang Chenjie Hong Kai Chen Rongzhou Yang Xuepeng Zhang Jianwei Yang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第6期3691-3710,共20页
Aiming at mitigating the high risks associated with conventional explosive blasting,this study developed a safe directional fracturing technique,i.e.instantaneous expansion with a single fracture(IESF),using a coal-ba... Aiming at mitigating the high risks associated with conventional explosive blasting,this study developed a safe directional fracturing technique,i.e.instantaneous expansion with a single fracture(IESF),using a coal-based solid waste expanding agent.First,the mechanism of directional fracturing blasting by the IESF was analyzed,and the criterion of directional crack initiation was established.On this basis,laboratory experiments and numerical simulations were conducted to systematically evaluate the directional fracturing blasting performance of the IESF.The results indicate that the IESF presents an excellent directional fracturing effect,with average surface undulation differences ranging from 8.1 mm to 22.7 mm on the fracture surfaces.Moreover,during concrete fracturing tests,the stresses and strains in the fracturing direction are measured to be 2.16-3.71 times and 8 times larger than those in the nonfracturing direction,respectively.Finally,the IESF technique was implemented for no-pillar mining with gob-side entry retaining through roof cutting and pressure relief in an underground coal mine.The IESF technique effectively created directional cracks in the roof without causing severe roadway deformation,achieving an average cutting rate and maximum roadway deformation of 94%and 197 mm,respectively.These on-site test results verified its excellent directional rock fracturing performance.The IESF technique,which is safe,efficient,and green,has considerable application prospects in the field of rock mechanics and engineering. 展开更多
关键词 Coal-based solid waste expanding agent Directional fracturing blasting Non-explosive Crack initiation Stress-strain-damage evolution
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Towards carbon neutrality: A comprehensive study on the utilization and resource recovery of coal-based solid wastes 认领 引用 被引量：7
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作者 Zhiguo Zhang Cui Xu +1 位作者 Gan Cheng Ee Von Lau 《International Journal of Coal Science & Technology》 SCIE EI CAS CSCD 2025年第3期1-24,共24页
Coal-based soild wastes(CBSWs)are industrial byproducts that can be harmful to the environment.The exploitation and utilization of CBsWs offer societal advantages such as resource conservation,pollution reduction,and ... Coal-based soild wastes(CBSWs)are industrial byproducts that can be harmful to the environment.The exploitation and utilization of CBsWs offer societal advantages such as resource conservation,pollution reduction,and cost-effective production.However,environmentally sustainable management remains a worldwide challenge due to the substantial production volume and limited disposal capacity of CBSWs.The physicochemical properties and utilization of CBSWs are summarized,including fly ash,coal gangue and coal gasification slag.It also presents the current global applications status of CBSWs resources and examines market supply and demand.Subsequently,the paper provides an overview of studies on ways to utilise CBSWs,highlighting the primary avenues of CBSWs resource utilization which are mainly from the fields of chemical materials,metallurgy and agriculture.Furthermore,a comparative evaluation of the various methods for CBSWs resource recovery is conducted,outlining their respective advantages and disadvantages.The future development of CBSWs recycling processes is also discussed.The review concludes that while there is a growing need for attention in CBSWs recycling,its utilization will involve a combination of both large-scale treatment and refinement processes.The paper aims to offer references and insights for the effective utilization and environmental protection of CBSWs.Future direction will focus on the collaborative utilization of CBSWs,emphasizing on the combination of large-scale and high-value utilization.In addition,there is a need to establish a comprehensive database based on on-site production practices,explore on-site solutions to reduce transportation costs,and improve physicochemical properties during the production process. 展开更多
关键词 Coal-based solid wastes(CBSWs) High-value utilization Carbon neutrality Materials
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Advancing green sustainability: A comprehensive review of biomass briquette integration for coal-based energyframeworks 认领 引用
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作者 Mingjun Wu Kexin Wei +2 位作者 Jinxuan Jiang Ben Bin Xu Shengbo Ge 《International Journal of Coal Science & Technology》 SCIE EI CAS CSCD 2025年第3期248-273,共26页
With the continuous development of various industries and the increasing use of electricity and fuel,the emission of large amounts of greenhouse gases has seriously affected the ecosystem.Bulk coal is often used as a ... With the continuous development of various industries and the increasing use of electricity and fuel,the emission of large amounts of greenhouse gases has seriously affected the ecosystem.Bulk coal is often used as a fuel for metallurgy and power generation,but the harmful gases produced by its combustion cause serious pollution to the environment.To reduce the emission of harmful gases,we found that biomass briquette has the characteristics of low heavy metal content and less pollutant release when burned.In this paper,the preparation and influencing factors of biomass briquette,the characteristics of different types of biomass briquette and the pollution characteristics of biomass briquette are reviewed.The potential pollution during the preparation and combustion of biomass briquette was also discussed from the perspective of life cycle assessment.Compared with bulk coal,biomass briquette emits fewer toxic gases during preparation and combustion,such as NOxand SO2.Secondly,the preparation of biomass briquette can also reduce the burden of water resources and soil.To that end,we explore the hazards caused by the preparation and combustion of biomass briquette,analyze its impact on the environment and human body,and summarize the sulfur and nitrogen retention capacity of biomass briquette to achieve the purpose of reducing harmful gas emissions.The results show that biomass briquette can be used as clean coal-based energy instead of traditional energy because of its low harmful substance content.The development and application prospect of biomass briquette under the framework of sustainable development are discussed. 展开更多
关键词 Biomass briquette Carbon emissions Coal-based energy Sustainable development Environmental pollution
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Effect of coal-based composite binders on isothermal oxidation kinetics of vanadium–titanium magnetite pellets 认领 引用
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作者 Yong-kang Zhang Guang-hui Li +4 位作者 Ye-sheng Cheng Jin Zhang Cheng-zhi Wei Xin Zhang Tao Jiang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第10期3190-3201,共12页
The isothermal oxidation kinetics of vanadium–titanium magnetite(VTM)pellets prepared with 3Co-binder(coal-based colloidal composite binder)and F-binder(pulverized Funa binder)are compared.The oxidation process was a... The isothermal oxidation kinetics of vanadium–titanium magnetite(VTM)pellets prepared with 3Co-binder(coal-based colloidal composite binder)and F-binder(pulverized Funa binder)are compared.The oxidation process was analyzed using the first-order irreversible reaction,following the shrinking unreacted nucleus model.The results demonstrate that VTM pellets prepared with 3Co-binder exhibit a faster oxidation rate than those with F-binder across the temperatures ranging from 1073 to 1473 K.In both cases,the oxidation process was controlled by an interfacial chemical reaction during the pre-oxidation stage and by internal diffusion during the mid-oxidation stage.The type of binder did not influence the primary oxidation control mechanism of the VTM pellets.However,the apparent rate constants in the pre-oxidation stage and the internal diffusion coefficients in the mid-oxidation stage were higher for pellets with 3Co-binder compared to those with F-binder.The apparent activation energies for the 3Co-binder pellets were similar to those of bentonite,indicating favorable kinetic conditions without negative impacts on the oxidation process.Nonetheless,it is important to note that pellets with F-binder required a longer oxidation time than those with 3Co-binder. 展开更多
关键词 Coal-based composite binder Vanadium-titanium magnetite Pellet Isothermal oxidation kinetics
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Behaviors of vanadium and chromium in coal-based direct reduction of high-chromium vanadium-bearing titanomagnetite concentrates followed by magnetic separation 认领 引用 被引量：19
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作者 赵龙胜 王丽娜 +3 位作者 陈德胜 赵宏欣 刘亚辉 齐涛 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第4期1325-1333,共9页
The reduction behaviors of FeO·V2O3 and FeO·Cr2O3 during coal-based direct reduction have a decisive impact on the efficient utilization of high-chromium vanadium-bearing titanomagnetite concentrates. The ef... The reduction behaviors of FeO·V2O3 and FeO·Cr2O3 during coal-based direct reduction have a decisive impact on the efficient utilization of high-chromium vanadium-bearing titanomagnetite concentrates. The effects of molar ratio of C to Fe n(C)(Fe) and temperature on the behaviors of vanadium and chromium during direct reduction and magnetic separation were investigated. The reduced samples were characterized by X-ray diffraction(XRD), scanning election microscopy(SEM) and energy dispersive spectrometry(EDS) techniques. Experimental results indicate that the recoveries of vanadium and chromium rapidly increase from 10.0% and 9.6% to 45.3% and 74.3%, respectively, as the n(C)(Fe) increases from 0.8 to 1.4. At n(C)(Fe) of 0.8, the recoveries of vanadium and chromium are always lower than 10.0% in the whole temperature range of 1100-1250 °C. However, at n(C)(Fe) of 1.2, the recoveries of vanadium and chromium considerably increase from 17.8% and 33.8% to 42.4% and 76.0%, respectively, as the temperature increases from 1100 °C to 1250 °C. At n(C)(Fe) lower than 0.8, most of the FeO·V2O3 and FeO·Cr2O3 are not reduced to carbides because of the lack of carbonaceous reductants, and the temperature has little effect on the reduction behaviors of FeO·V2O3 and FeO·Cr2O3, resulting in very low recoveries of vanadium and chromium during magnetic separation. However, at higher n(C)(Fe), the reduction rates of FeO·V2O3 and FeO·Cr2O3 increase significatly because of the excess amount of carbonaceous reductants. Moreover, higher temperatures largely induce the reduction of FeO·V2O3 and FeO·Cr2O3 to carbides. The newly formed carbides are then dissolved in the γ(FCC) phase, and recovered accompanied with the metallic iron during magnetic separation. 展开更多
关键词 high-chromium vanadium-bearing titanomagnetite concentrates coal-based direct reduction magnetic separation reduction behavior vanadium chromium
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A review of the synthesis and application of zeolites from coal-based solid wastes 认领 引用 被引量：23
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作者 Xiaoyu Zhang Chunquan Li +2 位作者 Shuilin Zheng Yonghao Di Zhiming Sun 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2022年第1期1-21,共21页
Zeolite derived from coal-based solid wastes(coal gangue and coal fly ash)can overcome the environmental problems caused by coal-based solid wastes and achieve valuable utilization.In this paper,the physicochemical pr... Zeolite derived from coal-based solid wastes(coal gangue and coal fly ash)can overcome the environmental problems caused by coal-based solid wastes and achieve valuable utilization.In this paper,the physicochemical properties of coal gangue and coal fly ash are introduced.The mechanism and application characteristics of the pretreatment processes for zeolite synthesis from coal-based solid wastes are also introduced.The synthesis processes of coal-based solid waste zeolite and their advantages and disadvantages are summarized.Furthermore,the application characteristics of various coal-based solid waste zeolites and their common application fields are illustrated.Finally,we propose an alkaline fusion-assisted supercritical hydrothermal crystallization as an efficient method for synthesizing coal-based solid waste zeolites.In addition,more attention should be given to the recycling of alkaline waste liquid and the application of coal-based solid waste zeolites in the field of volatile organic compound adsorption removal. 展开更多
关键词 coal-based solid waste coal fly ash coal gangue zeolite
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Enhanced photocatalytic hydrogen production from Co-MOF/CN by nitrogen and sulfur co-doped coal-based carbon quantum dots 认领 引用 被引量：14
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作者 Shiyong Xu Mei Li +3 位作者 Yijun Wang Caiyun Gao Rongsheng Xu Zhiliang jin 《Journal of Rare Earths》 SCIE EI CAS CSCD 2024年第5期838-850,I0002,共13页
A novel composite photocatalyst for photocatalytic decomposition of water for hydrogen evolution was successfully synthesized by in-situ growth of nitrogen and sulfur co-doped coal-based carbon quantum dots(NSCQDs)nan... A novel composite photocatalyst for photocatalytic decomposition of water for hydrogen evolution was successfully synthesized by in-situ growth of nitrogen and sulfur co-doped coal-based carbon quantum dots(NSCQDs)nanoparticles on the surface of sheet cobalt-based metal-organic framework(Co-MOF)and graphitic carbon nitride(g-C3N4,CN).The structure and properties of the obtained catalysts were systematically analyzed.NSCQDs effectively broaden the absorption of Co-MOF and CN in the visible region.The new composite photocatalyst has high hydrogen production activity and the hydrogen production rate reaches 6254μmol/(g·h)at pH=9.At the same time,NSCQDs synergy Co-MOF/CN composites have good stability.After four cycles of hydrogen production,the performance remains relatively stable.The tran sient photocurrent response and Nyquist plot experimental results further demonstrate the improvement of carrier separation efficiency in composite catalysts.The semiconductor type(n-type semico nductor)of the single-phase catalyst was determined by the Mott-Schottky test,and the band structure was analyzed.The conductive and valence bands of CN are-0.99 and 1.72 eV,respectively,and the conduction and valence bands of Co-MOF are-1.85 and 1.33 eV,respectively.Th e mechanism of the photocatalytic reaction can be inferred,that is,Z-type heterojunction is formed between CN an d Co-MOF,and NSCQDs was used as cocatalyst. 展开更多
关键词 Nitrogen and sulfur co-doped Coal-based carbon quantum dots Co-MOF CN Photocatalytic hydrogen evolution Rare earths
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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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Recovery of iron and copper from copper tailings by coal-based direct reduction and magnetic separation 认领 引用 被引量：10
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作者 Chao Geng Hua-jun Wang +2 位作者 Wen-tao Hu Li Li Cheng-shuai Shi 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2017年第10期991-997,共7页
A technique comprising coal-based direct reduction followed by magnetic separation was presented to recover iron and copper from copper slag flotation tailings.Optimal process parameters,such as reductant and additive... A technique comprising coal-based direct reduction followed by magnetic separation was presented to recover iron and copper from copper slag flotation tailings.Optimal process parameters,such as reductant and additive ratios,reduction temperature,and reduction time,were experimentally determined and found to be as follows：a limestone ratio of 25%,a bitumite ratio of 30%,and reduction roasting at 1473 Kfor 90 min.Under these conditions,copper-bearing iron powders（CIP）with an iron content of 90.11% and copper content of 0.86%,indicating iron and copper recoveries of87.25% and 83.44%respectively,were effectively obtained.Scanning electron microscopy and energy dispersive spectroscopy of the CIP revealed that some tiny copper particles were embedded in metal iron and some copper formed alloy with iron,which was difficult to achieve the separation of these two metals.Thus,the copper went into magnetic products by magnetic separation.Adding copper into the steel can produce weathering steel.Therefore,the CIP can be used as an inexpensive raw material for weathering steel. 展开更多
关键词 Copper slag Coal-based direct reduction Magnetic separation Iron powder Weathering steel
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Coal-based reduction mechanism of low-grade laterite ore 认领 引用 被引量：10
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作者 李艳军 孙永升 +1 位作者 韩跃新 高鹏 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第11期3428-3433,共6页
A low-grade nickel laterite ore was reduced at different reduction temperatures. The morphology of metallic particles was investigated by scanning electron microscopy （SEM） and energy dispersive spectroscopy （EDS）... A low-grade nickel laterite ore was reduced at different reduction temperatures. The morphology of metallic particles was investigated by scanning electron microscopy （SEM） and energy dispersive spectroscopy （EDS）. Experimental results indicate that the metallic nickel and iron gradually assemble and grow into larger spherical particles with increasing temperature and prolonging time. After reduction, the nickel laterite ore obviously changes into two parts of Fe-Ni metallic particles and slag matrix. An obvious relationship is found between the reduction of iron magnesium olivine and its crystal chemical properties. The nickel and iron oxides are reduced to metallic by reductant, and the lattice of olivine is destroyed. The entire reduction process is comprised of oxide reduction and metallic phase growth. 展开更多
关键词 nickel laterite ore coal-based reduction reduction mechanism Fe-Ni metallic phase
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Review on coal-based reduction and magnetic separation for refractory iron-bearing resources 认领 引用 被引量：6
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作者 Qiang Zhang Yongsheng Sun +2 位作者 Yuexin Han Yanjun Li Peng Gao 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2022年第12期2087-2105,共19页
The application of coal-based reduction in the efficient recovery of iron from refractory iron-bearing resources is comprehensively reviewed.Currently,the development and beneficiation of refractory iron-bearing resou... The application of coal-based reduction in the efficient recovery of iron from refractory iron-bearing resources is comprehensively reviewed.Currently,the development and beneficiation of refractory iron-bearing resources have attracted increasing attention.However,the effect of iron recovery by traditional beneficiation methods is unacceptable.Coal-based reduction followed by magnetic separation is proposed,which adopts coal as the reductant to reduce iron oxides to metallic iron below the melting temperature.The metallic iron particles aggregate and grow,and the particle size continuously increases to be suitable for magnetic separation.The optimization and application of coal-based reduction have been abundantly researched.A detailed literature study on coal-based reduction is performed from the perspectives of thermodynamics,reduction kinetics,growth of metallic iron particles,additives,and application.The coal-based reduction industrial equipment can be developed based on the existing pyrometallurgical equipments,rotary hearth furnace and rotary kiln,which are introduced briefly.However,coal-based reduction currently mainly adopts coal as a reductant and fuel,which may result in high levels of carbon dioxide emissions,energy consumption,and pollution.Technological innovation aiming at decreasing carbon dioxide emissions is a new trend of green and sustainable development of the steel industry.Therefore,the substitution of coal with clean energy(hydrogen,biomass,etc.)for iron oxide reduction shows promise in the future. 展开更多
关键词 refractory iron-bearing resources coal-based reduction iron recovery equipment carbon dioxide emissions
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Reaction behavior of associated rare earth minerals during coal-based reduction 认领 引用 被引量：5
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作者 Peng Gao Zhi-Hang Li +1 位作者 Yue-Xin Han Yong-Sheng Sun 《Rare Metals》 SCIE EI CAS CSCD 2014年第5期628-632,共5页
In order to ascertain the reaction behavior of rare earth minerals in coal-based reduction, X-ray diffraction（XRD）, scanning electron microscopy（SEM）, and energy dispersive spectroscopy（EDS） analyses were applie... In order to ascertain the reaction behavior of rare earth minerals in coal-based reduction, X-ray diffraction（XRD）, scanning electron microscopy（SEM）, and energy dispersive spectroscopy（EDS） analyses were applied to investigate the rare earth minerals in Bayan Obo.The occurrence state and regularity of rare earth elements were analyzed under different reduction time. The results reveal that rare earth elements in rare earth minerals exist in RE（CO3）F（bastnaesite） and REPO4（monazite）. In this research, at 1,498 K with a C/O molar ratio（i.e., molar ratio of fixed carbon in the coal to reducible oxygen in the ore） of2.5, rare earth minerals primarily decompose into RE2O3at5 min. When the time is extended to 10 min, solid-phase reactions occur among RE2O3, CaO, and SiO2, and the resultant is cerium wollastonite（CaO·2RE2O3·3SiO2）. At reaction time 〉20 min, rare earth elements mainly exist in cerium wollastonite（CaO·2RE2O3·3SiO2）, and the grain size varies in the range of 10–30 μm. The results show that coal-based reduction is efficient to recover rare earth minerals in reduced materials. 展开更多
关键词 Coal-based reduction Rare earth minerals Reaction behavior
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Adsorption and Regeneration of Volatile Organic Compounds(VOCs)on Coal-Based Activated Carbon by Ferric Nitrate Modification 认领 引用 被引量：4
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作者 Jin Chunjiang Chen Huimin +2 位作者 Wang Luyuan Cheng Xingxing Sun Rongfeng 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2021年第3期137-150,共14页
In this study,the Heishan coal was used to prepare a series of activated carbon(AC)samples via a vapor deposition method.The effects of the Fe(NO3)3/coal weight ratio on the physicochemical properties of the activa... In this study,the Heishan coal was used to prepare a series of activated carbon(AC)samples via a vapor deposition method.The effects of the Fe(NO3)3/coal weight ratio on the physicochemical properties of the activated carbon were systematically investigated,and the AC samples were analyzed by the N2 adsorption-desorption technique,the scanning electron microscopy,the X-ray diffraction,the Raman spectroscopy,and the Fourier transform infrared spectroscopy.Furthermore,the adsorption properties of ethyl acetate were investigated.The results indicated that as the Fe(NO3)3/coal mass ratio increased from 1:8 to 1:2,the specific surface area,the total pore volume and the micropore volume initially increased and then decreased.The specific surface area increased from 560.86 m2/g to 685.90 m2/g,and then decreased to 299.56 m2/g.The total pore volume and micropore volume increased from 0.29 cm3/g and 0.17 cm3/g to 0.30 cm3/g and 0.22 cm3/g,and then decreased to 0.16 cm3/g and 0.10 cm3/g,respectively.The optimized ratio was 1:8.During the activation process,iron ions infiltrated the activated carbon to promote the development of the pore structure,the pore size of which was between 2.5 nm and 3 nm in daimeter.This approach could enhance the capacity for adsorption of ethyl acetate.It is worth noting that the ACs displaying the largest specific surface area and total pore volume(685.90 m2/g and 0.30 cm3/g)were formed under the optimized activation conditions(950℃,20%(volume)of CO2,ratio 1:5),and the maximum AC capacity for adsorption of ethyl acetate was 962.62 mg/g.After seven repeated thermal regeneration experiments,the saturated AC adsorption capacity was still above 90%. 展开更多
关键词 coal-based activated carbon VOCs removal adsorption regeneration
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Study on methanol synthesis from coal-based syngas 认领 引用 被引量：8
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作者 MA Hong-fang YING Wei-yong FANG Ding-ye 《Journal of Coal Science & Engineering(China)》 2009年第1期98-103,共6页
The intrinsic kinetic models of the Langmuir-Hinshelwood type were investigated in terms of the reaction rates of CO hydrogenation and CO_2 hydrogenation in theform of reactant fugacity. The parameters were estimated ... The intrinsic kinetic models of the Langmuir-Hinshelwood type were investigated in terms of the reaction rates of CO hydrogenation and CO_2 hydrogenation in theform of reactant fugacity. The parameters were estimated by the Universal Global Optimization using the Marquardt method. Residual error distribution and statistic tests show thatthe intrinsic kinetic models are reliable and acceptable. The mathematic model of a combined converter formed by gas-cooled and water-cooled reactor was developed and thegas-cooled reactor and the water-cooled reactor were characterized with one-dimensionalmathematic model. The distributions of temperature and concentration in the catalytic bedof the gas-cooled reactor and the water-cooled reactor in a combined converter with ayield of 1.2 Mt/a were simulated. The parallel cross linking pore model was used to describe the transfer process of multi-component diffusion system in the catalyst. The calculated value computed by the internal diffusion efficiency factor calculation model established for methanol synthesis catalyst fit the experimental value very well. 展开更多
关键词 methanol coal-based syngas kinetics diffusion
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In Situ Synthesis of NaY Zeolite with Coal-Based Kaolin 认领 引用 被引量：9
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作者 Xinmei Liu, Zifeng Yan, Huaiping Wang, Yantuo LuoState Key Laboratory for Heavy Oil Processing, Key Laboratory of Catalysis, CNPC, University of Petroleum, Dongying 257061, China 《Journal of Natural Gas Chemistry》 2003年第1期63-70,共8页
NaY zeolites were in-situ synthesized from coal-based kaolin via thehydrothermal method. The effects of various factors on the structure of the samples were extensivelyinvestigated. The samples were characterized by N... NaY zeolites were in-situ synthesized from coal-based kaolin via thehydrothermal method. The effects of various factors on the structure of the samples were extensivelyinvestigated. The samples were characterized by N_2 adsorption, XRD, IR and DTG-DTA methods, andthe results show that the crystallization temperature and amount of added water play an importantrole in the formation of the zeolite structure. The 4A and P zeolites are the competitive phasepresent in the resulting product. However, NaY zeolites with a higher relative crystallinity,excluding impure crystals and the well hydrothermal stability, can be synthesized from coal-basedkaolin. These zeolites possess a larger surface area and a narrow pore size distribution, and thismeans that optimization of this process might result in a commercial route to synthesize NaYzeolites from coal-based kaolin. 展开更多
关键词 coal-based kaolin NaY zeolite in-situ hydrothermal synthesis
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Role of Ni(NO_3)_2 in the preparation of a magnetic coal-based activated carbon 认领 引用 被引量：18
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作者 ZhangJun Xie Qiang Liu Juan Yang Mingshun Yao Xing 《Mining Science and Technology》 2011年第4期599-603,共5页
The role of Nil（NO3）2 in the preparation of a magnetic activated carbon is reported in this paper. Magnetic coal-based activated carbons （MCAC） were prepared from Taixi anthracite with low ash content in the prese... The role of Nil（NO3）2 in the preparation of a magnetic activated carbon is reported in this paper. Magnetic coal-based activated carbons （MCAC） were prepared from Taixi anthracite with low ash content in the presence of Ni（NO3）2. The MCAC materials were characterized by a vibrating sample magnetometer （VSM）, X-ray diffraction （XRD）, a scanning electric microscope （SEM）, and by N2 adsorption. The cylindri- cal precursors and derived char were also subjected to thermogravimetric analysis to compare their behavior of weight losses during carbonization. The results show that MCAC has a larger surface area （1074 m21g） and a higher pore volume （0.5792 cm3/g） with enhanced mesopore ratio （by about 10~）. It also has a high saturation magnetization （1.6749 emu/g） and low coercivity （43.26 Oe）, which allows the material to be magnetically separated. The MCAC is easily magnetized because the nickel salt is con- vetted into Ni during carbonization and activation. Metallic Ni has a strong magnetism on account of electrostatic interaction. Added Ni（NO3）2 catalyzes the carbonization and activation process by accelerat- ing burn off of the carbon, which contributes to the development of mesopores and macropores in the activated carbon. 展开更多
关键词 Magnetic coal-based activated carbon Ni（NO3）2 Magnetic properties Pore structure
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Characterization of semi-coke generated by coal-based direct reduction process of siderite 认领 引用
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作者 朱德庆 罗艳红 +1 位作者 潘建 周仙霖 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第8期2914-2921,共8页
Solid wastes derived from metallurgical industries pose a significant threat to environment. The utilization and disposal of these solid wastes are the major concern in the world. Semi-coke generated in coal-based dir... Solid wastes derived from metallurgical industries pose a significant threat to environment. The utilization and disposal of these solid wastes are the major concern in the world. Semi-coke generated in coal-based direct reduction process of iron ore is a by-product and its suitable utilization is not available so far. In order to handle it properly, the characteristics of this by-product were comprehensively investigated. A series of analysis methods were used to demonstrate its mineral compositions, petrography and physico-chemical properties. The results reveal that the semi-coke has poor washability. The fixed carbon content of semi-coke reaches 76.11% and the gross calorific value is 28.10 MJ/kg, both of which are similar to those of traditional sinter coke breeze. Also, semi-coke ash possesses lower content of SiO2, Al2O3, S and higher content of CaO and MgO, which could improve the strength of sinter ore when partially substituting for coke breeze in sintering. Semi-coke features well-development porous structure and higher reaction activity, which predicts that the sintering speed could be elevated to some extent when employing it as a partial replacement of coke breeze, so the studies further suggest that the potential adverse effect of the high reactivity on sintering process could be weakened by adequately coarsening the semi-coke's particle size. 展开更多
关键词 semi-coke coal-based direct reduction non-magnetic product sinter fuel
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Modeling and simulation of tube-shell reactor for dimethyl-ether synthesis from coal-based synthesis ga 认领 引用
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作者 CHEN Da-sheng ZHANG Hai-tao +1 位作者 YING Wei-yong FANG Ding-ye 《Journal of Coal Science & Engineering(China)》 2011年第1期81-87,共7页
Mathematical simulation was performed on tube-shell reactor for dimethyl ether （DME） synthesis from coal-based syngas. The model was established based on kinetics of dimethyl-ether synthesis from syngas over a bifun... Mathematical simulation was performed on tube-shell reactor for dimethyl ether （DME） synthesis from coal-based syngas. The model was established based on kinetics of dimethyl-ether synthesis from syngas over a bifunctional catalyst, which is mixed by methanol synthesis catalyst and dehydration catalyst as 1：1 mass ratio. Methanol synthesis from CO and CO2 and methanol dehydration were selected as three-independent reactions, CO, CO2, and DME as key components to estab- lish the one-dimensional mathematical model of the reactor. The gas concentration and temperature profiles inside the reactor tubes were obtained. The operating conditions affecting DME synthesis were also discussed based on the model. The simula- tions indicate that higher pressure and lower temperature at the inlet and rich hydrogen in the reactant are favorable in direct DME synthesis in fixed-bed process, and the temperature of boiling water affect the reactor performance seriously. 展开更多
关键词 dimethyl-ether coal-based synthesis gas tube-shell reactor model simulation
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Comparison of Coal-Based Dimethyl Ether and Diesel as Vehicle Fuels from Well to Wheel in China 认领 引用
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作者 张亮 黄震 《Journal of Shanghai Jiaotong university(Science)》 EI 2009年第2期210-214,共5页
With life cycle assessment(LCA) methodology,a life cycle model of coal-based vehicle fuels(CBVFs) including coal-based dimethyl ether(CBDME) and coal-based diesel(CBD) is established.Their primary energy consumption(P... With life cycle assessment(LCA) methodology,a life cycle model of coal-based vehicle fuels(CBVFs) including coal-based dimethyl ether(CBDME) and coal-based diesel(CBD) is established.Their primary energy consumption(PEC) and global warming potential(GWP) from well to wheel including feedstock extraction,fuel production,fuel consumption in vehicle and energy transportation are calculated and compared.Results show that the life cycle PEC and GWP of CBD pathway are 1.17 and 1.34 times as CBDME pathway.Based on the above results,CBDME will become a choice with great potential to replace conventional petroleum-based diesel (CPBD) in China. 展开更多
关键词 coal-based vehicle fuel （CBVF） life cycle assessment （LCA） primary energy consumption （PEC） global warming potential （GWP）
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