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| 1 | Mechanism for suspension magnetization roasting of iron ore using straw-type biomass reductant显示文摘As an alternative reductant for fossil fuel in the future,straw-type biomass contributes to emission reduction and green utilization in the suspension roasting process.In this study,the influences of the roasting time,roasting temperature and dose of straw-type biomass after suspension magnetization roasting(SMR) and separation were investigated.The optimal conditions were determined to be a roasting time of 7.5 min with a straw-type biomass dose of 20 wt% and a roasting temperature of 800℃ in which an iron grade of 71.07% and recovery of 94.17% were obtained for the iron concentrate.The maximum saturation magnetization under optimal conditions was 35.05 A·m^(2)·g^(-1),and the gaseous regulation of the biomass revealed that cumulative reducing gas volume was 293.93 mL at the optimal roasting time of450 s.The transformation of hematite to magnetite was detected by X-ray diffraction(XRD).During microstructure evolution,the outer layer consisting of fissures and tiny holes continuously deepened toward the core. | Yue Cao Yongsheng Sun Peng Gao Yuexin Han Yanjun Li | 2021 | International Journal of Mining Science and Technology2021，31，6： | 8 |
| 2 | Mineral phase and structure changes during roasting of fine-grained carbonaceous gold ores and their effects on gold leaching efficiency显示文摘While roasting has been widely applied to reduce the negative effect of carbonaceous matters on gold extraction from fine-grained carbonaceous gold ores, the phase and structure changes of minerals during roasting and their in fluences on the leachi ng rate of gold have not been fully understood. This limits the extraction of carbonaceous gold deposits. The current work examines the oxidation process of a fine-grained carbonaceous gold ore during roasting using a range of techniques including X-ray diffraction (XRD), seanning electron microscopy (SEM), Energy Dispersive Spectrometer (EDS) analysis and pore structure analysis together with gold leaching tests. The results show that during the process of oxidative roasting, the carbonaceous matters (organic carbon and graphitic carbon) and pyrite were completely decomposed at 600 ℃ with the carbonaceous components burned and pyrite oxidized into hematite. At 650 ℃, while dolomite was decomposed into calcia, magnesia, calcium sulfate etc., the calcine structure became loose and porous, leading to a high gold leaching rate from the roasted product. Above 750 ℃, the porous calcite structure started to collapse along with the agglomeration, leading to the secondary encapsulation of gold particles, which contributed to the sharp drop in the gold leaching rate of the roasted product. This study suggests optimum phase and structure changes of minerals during roasting to achieve maximum gold extraction from fine-grained carbonaceous gold deposits. | Jianping Jin Yuexin Han Hui Li Yangyang Huai Yongjun Peng Xiaotian Gu Wei Yang | 2019 | Chinese Journal of Chemical Engineering2019，27，5： | 4 |
| 3 | Resource utilization of slag from desulphurization and slag skimming:A comprehensive recycling process of all components显示文摘In order to make the slag from desulphurization and slag skimming(SDSS)to be comprehensively recycled and utilized,a combined process of beneficiation and building materials preparation was proposed to recover iron from SDSS,meanwhile to apply the remaining slag tailings as cement admixture.From this process,three iron-rich products were recovered in stages by clean gravity-magnetic separation,slag tailings were left.Slag powder was prepared by ultrafine grinding of slag tailings.The stability,setting time and cement mortar strength of the slag tailings cements(STC)which were mixed with Portland cement and slag powder were studied respectively.The results showed that a proper overall performance still could be obtained at the slag powder content of 30%.Chemical composition analysis,X-ray diffraction(XRD)analysis,metallographic microscope and scanning electron microscope(SEM)analysis were employed to assess the characteristics of the SDSS and the products obtained from the whole process.The results indicated that the three iron-rich products could be used as a raw material for steelmaking and ironmaking and the relatively large amount of calcium silicate(C_(2)S)and tricalcium silicate(C_(3)S)in the slag tailings make the addition of slag powder into the Portland cement feasible. | Xiao Liu Peng Gao Yuexin Han | 2022 | International Journal of Mining Science and Technology2022，32，3： | 2 |
| 4 | Review on coal-based reduction and magnetic separation for refractory iron-bearing resources显示文摘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. | Qiang Zhang Yongsheng Sun Yuexin Han Yanjun Li Peng Gao | 2022 | International Journal of Minerals,Metallurgy and Materials2022，29，12： | 1 |
| 5 | Comparison of nutrient composition of parental rice and rice genetically modified with cowpea trypsin inhibitor in China 显示文摘 | Han Junhua Yang Yuexin Chen Shurong | 2005 | J Food Composition and Analysis2005，18，4： | 1 |
| 6 | Comparison of low-grade hematite product characteristics in a high-pressure grinding roller and jaw crusher显示文摘 | Han Yuexin Liu Lei Yuan Zhitao Wang Zehong Zhang Patrick | 2012 | EN2012，，2： | 1 |
| 7 | Formation mechanisms of SrTiO 3 nanoparticles under hydrothermal conditions显示文摘 | Shicheng Zhang Jiaxiang Liu Yuexin Han Bingchen Chen Xingguo Li | 2004 | Materials Science & Engineering B2004，，1： | 1 |
| 8 | Reaction behavior of iron minerals and metallic iron particles growth in coal-based reduction of an oolitic Iron ore显示文摘 | SUN Yongsheng GAO Peng HAN Yuexin | 2013 | Industrial and Engineering Chemistry Research2013，52，6： | 1 |
| 9 | The influence of TiO2*H2O gel on hydrothermal synthesis of SrTiO3 powders 显示文摘 | Shicheng Zhang Yuexin Han Bingchen Chen | 2001 | Materials Letters2001，51，： | 1 |
| 10 | Comparison of low-grade hematite product characteristics in a high-pressure grinding roller and jaw crusher 显示文摘 | Han Yuexin Liu Lei Yuan Zhitao | 2012 | Minerals and Metallurgical Processing2012，29，2： | 1 |
| 11 | Wet Pre-concentration of Low-grade Hematite in High-pressure Grinding Roller显示文摘 | Zhitao Yuan Lei Liu Yuexin Han | | 0，，： | 1 |
| 12 | The influence of TiO 2 ·H 2 O gel on hydrothermal synthesis of SrTiO 3 powders显示文摘 | Shicheng Zhang Yuexin Han Bingchen Chen Xiaoping Song | 2001 | Materials Letters2001，，4： | 1 |
| 13 | Formation mechanisms of SrTiO3 nanoparticles under hydrothermal conditions显示文摘 | Shicheng Zhang Jiaxiang Liu Yuexin Han | 2004 | Materials Science and Engineering B2004，110，1： | 1 |
| 14 | Two-step flotation recovery of iron concentrate from Donganshan carbonaceous iron ore显示文摘 | Yin Wanzhong Han Yuexin Xie Feng | 2010 | Journal of Central South University of Technology2010，17，： | 1 |
| 15 | The influence of TiO2 · H2O gel on hydrothermal synthesis of SrTiO3 powders显示文摘 | Shichen g Zhang Yuexin Han Bingchen Chen | 2001 | Materials Letters2001，51，11： | 1 |
| 16 | Preparation and characterization of uniform circinate aggregates of sheet ZnO nanoparticles显示文摘Uniform circinate aggregates of sheet ZnO nanoparticles with a specific surface area of 24 m2·g-1 were prepared by the direct precipitation method.The circinate aggregates were hexagonal ZnO,with the wall thickness ranging from 0.5 to 1 μm and the diameter ranging from 5 to 10 μm.The backs of the circinate aggregates were regularly arranged by numerous sheet ZnO nanoparticles with a thickness of 30-80 nm and a diameter of 300-400 nm.The precursors were aggregates of sheet Zn5(CO3)2(OH)6 nanoparticles,which were decomposed into ZnO by calcining in air in the range of 200-285°C,and the ZnO retained the similar special structure.The C2H5OH content had a significant effect on the formation of sheet ZnO.The centripetal force,the Van der Waals force,and the hydrogen bond were deduced as the driving forces of the formation of circinate. | LIU Jiaxiang DING Deling WANG Lisheng and HAN Yuexin | 2008 | Rare Metals2008，27，1： | 1 |
| 17 | Reaction behavior of iron minerals and metallic iron particles growth in coal-based reduction of an oolitic iron ore显示文摘 | SUN Yongsheng PENG Gao HAN Yuexin | 2013 | Industry & Engineering Chemical Research2013，52，6： | 1 |
| 18 | Comparison of nutrient composition of parental rice and rice genetically modified with cowpea trypsin inhibitor in China显示文摘 | Han Junhua Yang Yuexin Chen Shurong | 2005 | J Food Compos Anal2005，18，： | 1 |
| 19 | Formation mechanisms of SrTiO3 nanoparticles under hydrothermal conditions显示文摘 | ZHANG Shi-cheng LIU Jia-xiang HAN Yuexin | 2004 | Materials Science & Engineering B2004，110，： | 1 |
| 20 | Coal-based reduction mech- anism of low-grade laterite ore 显示文摘 | Li Yanjun Sun Yongsheng Han Yuexin | 2013 | Ransactions of Nonferrous Metals Society of China2013，23，： | 1 |
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