检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

焙烧预处理强化钼铜分离试验及机理研究

金属矿山 2024年第9期 92-97页

作者：马敏洁韩跃新李慧东北大学资源与土木工程学院辽宁沈阳110819 沈阳建筑大学材料科学与工程学院辽宁沈阳110623

为解决钼铜混合精矿的铜钼浮选分离难题,以某选厂钼铜混合精矿为研究对象,探究了焙烧预处理对钼、铜浮选分离效果的影响。结果表明:焙烧预处理能有效改善钼铜混合精矿的浮选分离效果,确定的适宜焙烧预处理条件为焙烧温度250℃,焙烧时间3... 详细信息

为解决钼铜混合精矿的铜钼浮选分离难题,以某选厂钼铜混合精矿为研究对象,探究了焙烧预处理对钼、铜浮选分离效果的影响。结果表明:焙烧预处理能有效改善钼铜混合精矿的浮选分离效果,确定的适宜焙烧预处理条件为焙烧温度250℃,焙烧时间30 min。预处理产品采用1粗2精1扫浮选流程处理,可获得钼精矿钼品位为44.30%、钼回收率为36.58%,铜精矿铜品位为14.23%、铜回收率为69.62%。焙烧产品的XRD和SEM-EDS分析结果表明,样品在焙烧过程中,主要矿物辉钼矿和黄铜矿均可发生氧化反应;当焙烧温度为250℃时,黄铜矿的表面氧化程度远高于辉钼矿,从而增大了两者可浮性差异,为有效分离铜、钼矿物分离创造了条件。

关键词：铜钼混合精矿焙烧预处理浮选

Resource utilization of slag from desulphurization and slag skimming:A comprehensive recycling process of all components

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2022年第3期32卷 585-593页

作者： Xiao Liu Peng Gao yuexin han School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China School of Chemical&Environmental Engineering Shandong University of Science&TechnologyQingdao 266590China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China National-local Joint Engineering Research Center of High-Efficient Exploitation Technology for Refractory Iron Ore Resources Shenyang 110819China

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 *** this process,three iron-rich products were recovered in stages by clean gravity-magnetic separation,slag tailings were *** powder was prepared by ultrafine grinding of slag *** stability,setting time and cement mortar strength of the slag tailings cements(STC)which were mixed with Portland cement and slag powder were studied *** 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 *** 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.

关键词： Desulphurization and slag skimming Beneficiation Iron-rich products Cement admixture Cementing property

海南石碌铁矿石氢基矿相转化——磁选试验研究

在线全文

学校读者我要写书评

暂无评论

金属矿山 2024年第2期 152-156页

作者：郭风芳韩跃新张琦高鹏何佳昊海南矿业股份有限公司海南昌江572799 东北大学资源与土木工程学院辽宁沈阳110819 难采选铁矿资源高效开发利用技术国家地方联合工程研究中心辽宁沈阳110819 辽宁东大矿冶工程技术有限公司辽宁朝阳122000

海南石碌铁矿石铁品位为52.45%,铁主要以赤(褐)铁矿形式存在,分布率达86.18%,少量以磁铁矿形式存在。为高效回收利用该矿石,采用氢基矿相转化(HMPT)—磁选工艺流程开展了系统的试验研究,并对适宜条件下的产品进行了化学成分、XRD和VSM... 详细信息

海南石碌铁矿石铁品位为52.45%,铁主要以赤(褐)铁矿形式存在,分布率达86.18%,少量以磁铁矿形式存在。为高效回收利用该矿石,采用氢基矿相转化(HMPT)—磁选工艺流程开展了系统的试验研究,并对适宜条件下的产品进行了化学成分、XRD和VSM分析。结果表明:试样在给矿粒度-0.074mm占89.41%、HMPT温度525℃、HMPT时间10min、总气体流量500m L/min、H_(2)浓度20%、HMPT产品磨矿细度-0.045mm占69.68%的适宜条件下,经磁选获得铁品位65.26%、铁回收率95.39%的铁精矿。试验所获铁精矿较原重磁联合工艺铁精矿品位提高了2.7个百分点,铁回收率增加了30个百分点。研究不仅为海南石碌铁矿氢基矿相转化—高效分选工业应用提供技术支撑,还为其他复杂难选铁矿资源的绿色高效分选提供了参考依据。

关键词：铁矿石氢基矿相转化磁选 H_(2)与CO摩尔比

Process mineralogy approach to optimize curing-leaching in vanadiumbearing stone coal processing plants

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2023年第1期33卷 123-131页

作者： Hui Li yuexin han Jianping Jin Peng Gao Zhenya Zhou School of Resource and Civil Engineering Northeastern UniversityShenyang 110819China National-Local Joint Engineering Research Center of High-Efficient Exploitation Technology for Refractory Iron Ore Resources Shenyang 110819China

The purpose of this study is to apply process mineralogy as a practical tool to further understand and analyze the reasons for low leaching rates in the curing-leaching process of vanadium-bearing stone coal and to find a solution or improvement to optimize the leaching *** vanadium-bearing stone coal with the V2O5 mass fraction of 0.88%as the research object,the effects of particle size,mineral composition,and sulfuric acid curing on the feed,intermediate,and final products of curing-leaching were *** main vanadium-bearing minerals in the feed samples included sericite/illite,montmorillonite,kaolinite,limonite,and *** the penetration depth analysis of sulfuric acid,the reason for the high vanadium content in the coarse leaching residue(0.205%V2O5)was found,mainly due to the poor curing effect and incomplete washing after ***,thorough washing after sieving and further optimizing the curing process are *** vanadium content of the fine leaching residue(0.078%)was low and the curing-leaching effect was ***,the vanadium content in the thickened residue(0.296%)exceeded that in the fine leaching residue,which was attributed to the neutralization reaction in the#1 *** solve this problem,the neutralization and thickening processes should be performed in separate *** analysis and detection of key products is helpful for identifying problems and improving the curing-leaching circuit process.

关键词： Process mineralogy Vanadium Stone coal Curing-leaching Penetration

Mechanism for suspension magnetization roasting of iron ore using straw-type biomass reductant

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2021年第6期31卷 1075-1083页

作者： Yue Cao Yongsheng Sun Peng Gao yuexin han Yanjun Li School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources Shenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

As an alternative reductant for fossil fuel in the future,straw-type biomass contributes to emission reduction and green utilization in the suspension roasting *** this study,the influences of the roasting time,roasting temperature and dose of straw-type biomass after suspension magnetization roasting(SMR) and separation were *** 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 *** 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 *** 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.

关键词： Straw-type biomass Suspension magnetization roasting Phase conversation Gases analyses Microstructure evolution

Reaction behavior and non-isothermal kinetics of suspension magnetization roasting of limonite and siderite

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2023年第5期30卷 824-833页

作者： Qiang Zhang Yongsheng Sun yuexin han Yanjun Li Peng Gao School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China National-local Joint Engineering Research Center of High-efficient exploitation technology for Refractory Iron Ore Resources Shenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

In order to develop limonite and decrease CO_(2) emissions,siderite is proposed as a clean reductant for suspension magnetization roasting(SMR) of *** iron concentrate(iron grade:65.92wt%,iron recovery:98.54wt%) was obtained by magnetic separation under the optimum SMR conditions:siderite dosage 40wt%,roasting temperature 700℃,roasting time 10 *** to the magnetic analysis,SMR achieved the conversion of weak magnetic minerals to strong magnetic minerals,thus enabling the recovery of iron via magnetic *** on the phase transformation analysis,during the SMR process,limonite was first dehydrated and converted to hematite,and then siderite decomposed to generate magnetite and CO,where CO reduced the freshly formed hematite to *** microstructure evolution analysis indicated that the magnetite particles were loose and porous with a destroyed structure,making them easier to be *** non-isothermal kinetic results show that the main reaction between limonite and siderite conformed to the two-dimension diffusion mechanism,suggesting that the diffusion of CO controlled the *** results encourage the application of siderite as a reductant in SMR.

关键词： reaction behavior non-isothermal kinetics suspension magnetization roasting siderite limonite CO_(2)emissions

经尿道前列腺电切术与经尿道柱状水囊前列腺扩开术治疗老年良性前列腺增生的比较研究

在线全文

学校读者我要写书评

暂无评论

老年医学与保健 2024年第4期30卷 981-984,1040页

作者：栾杰韩月欣王培耕青岛市胶州中心医院泌尿外科山东青岛266300

目的分析老年良性前列腺增生(BPH)治疗中,经尿道前列腺电切术(TURP)与经尿道柱状水囊前列腺扩开术(TUCBDP)的疗效差异,旨在为该病症提供更科学的治疗策略。方法回顾性分析2021年2月—2024年2月青岛市胶州中心医院收治的150例老年BPH患... 详细信息

目的分析老年良性前列腺增生(BPH)治疗中,经尿道前列腺电切术(TURP)与经尿道柱状水囊前列腺扩开术(TUCBDP)的疗效差异,旨在为该病症提供更科学的治疗策略。方法回顾性分析2021年2月—2024年2月青岛市胶州中心医院收治的150例老年BPH患者的临床资料,依据手术方式的不同分为TUCBDP组78例和TURP组72例,经倾向性评分匹配以1∶1比例,最终纳入基线均衡的2组,每组67例。分析2组围手术期与并发症情况。于术前及术后90 d,比较2组尿动力学指标[峰值排尿流速(Qmax)、尿后膀胱剩余量(RUV)、膀胱顺应程度(BC)、最大尿道闭合压(***)]和疾病转归[采用国际前列腺症状评分(IPSS)、BPH生活质量量表(BPHQLS)评估]。结果与TURP组相比,TUCBDP组的手术时长、尿管插置期限、膀胱灌洗时长、留院时长更短,手术失血量更少(均P0.05)。结论相比TURP术,TUCBDP术治疗的老年BPH患者围手术期指标改善效果更为显著,并且在促进排尿功能恢复、减少前列腺症状、提高生活质量和安全性等方面具有优势,但对远期疗效可能无影响。

关键词：老年良性前列腺增生经尿道柱状水囊前列腺扩开术经尿道前列腺电切术

Review on coal-based reduction and magnetic separation for refractory iron-bearing resources

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2022年第12期29卷 2087-2105页

作者： Qiang Zhang Yongsheng Sun yuexin han Yanjun Li Peng Gao School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China National-local Joint Engineering Research Center of High-efficient exploitation technology for Refractory Iron Ore Resources Shenyang 110819China

The application of coal-based reduction in the efficient recovery of iron from refractory iron-bearing resources is comprehensively ***,the development and beneficiation of refractory iron-bearing resources have attracted increasing ***,the effect of iron recovery by traditional beneficiation methods is ***-based reduction followed by magnetic separation is proposed,which adopts coal as the reductant to reduce iron oxides to metallic iron below the melting *** metallic iron particles aggregate and grow,and the particle size continuously increases to be suitable for magnetic *** 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 *** coal-based reduction industrial equipment can be developed based on the existing pyrometallurgical equipments,rotary hearth furnace and rotary kiln,which are introduced ***,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 *** innovation aiming at decreasing carbon dioxide emissions is a new trend of green and sustainable development of the steel ***,the substitution of coal with clean energy(hydrogen,biomass,etc.)for iron oxide reduction shows promise in the future.

关键词： refractory iron-bearing resources coal-based reduction iron recovery equipment carbon dioxide emissions

Effect of bastnaesite as reductant on hematite reduction during in-situ suspension magnetization roasting of refractory iron ore under neutral atmosphere

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2022年第4期32卷 877-886页

作者： Wenbo Li Jijia Chen Wentao Zhou yuexin han Yan Shan School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China National-Local Joint Engineering Research Center of High-Efficient Exploitation Technology for Refractory Iron Ore Resources Shenyang 110819China

The iron tailings of Bayan Obo mines are solid waste,which occupies land area and also causes environmental pollution;however,this waste can be *** this study,based on the characteristics of iron minerals and fluorocarbonate contained in Bayan Obo iron tailings,clean magnetization roasting of iron minerals by bastnaesite from iron tailings during in-situ suspension magnetization roasting in a neutral atmosphere was *** results show that for iron tailings with a mass of 12 g,a N_(2) gas flow rate of 600 mL/min,and roasting for 5 min at 800℃,iron concentrate with a 60.44%iron grade at an iron recovery of 76.04%could be obtained.X-ray diffraction analysis showed that the weak magnetic hematite was reduced to strong magnetic magnetite in the neutral atmosphere,without additional *** kinetics of the magnetization roasting of mineral mixtures(bastnaesite and hematite)in a neutral atmosphere showed that the optimal reaction mechanism function was the three-dimensional diffusion model with activation energy of 161.8838 kJ·mol^(-1);this indicates that the reaction was a heterogeneous,diffusion-controlled solid-state reaction.

关键词： Bayan Obo iron tailings In-situ suspension roasting Clean recovery Phase magnetic transformation Kinetics mechanism