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Influence of Na_2CO_3 as Additive on Direct Reduction of Boron-bearing Magnetite Concentrate

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Journal of Iron and Steel Research International 2016年第2期23卷 103-108页

作者： Yong-li LI Jing-kui QU Guang-ye WEI Tao QI National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringChinese Academy of Sciences Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of Sciences

Boron-bearing magnetite concentrate is typically characterized by low grade of iron and boron （wTFe = 51%- 54%, WB2O3 =6%-8%）, as well as the close intergrowth of ascharite phase and magnetite phase. A promising technology was proposed to separate iron and boron by coupling the direct reduction of iron oxides and Na activation of boron minerals together. The influence of Na2CO3 as additive on the direct reduction of boron-bearing magnetite was studied by chemical analysis, kinetic analysis, XRD analysis and SEM analysis. The results showed that the ad- dition of Na2CO3 not only activated boron minerals, but also reduced the activation energy of the reaction and pro- moted the reduction of iron oxides. Besides, the addition of Na2CO3 changed the composition and melting point of non-ferrous phase, and then promoted the growth and aggregation of iron grains, which was conducive to the subse- quent magnetic separation. Thus, the coupling of the two processes is advantageous,

关键词： ludwigite kinetic analysis direct reduction magnetic separation sodium carbonate

Removal of zirconium from hydrous titanium dioxide

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International Journal of Minerals,Metallurgy and Materials 2013年第1期20卷 1-8页

作者： Xue-qin Ma Ya-hui Liu Jing-long Chu Jie Li Tian-yan Xue Li-na Wang Tao Qi National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process Engineering Chinese Academy of Sciences Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

A method was proposed for removing zirconium （Zr） from hydrous titanium dioxide （HTD） by the NaF solution. The effects of main parameters, i.e. pH values, NaF dosage, temperature and retention time, on the removal of zirconium were stud- ied. The optimal conditions were found as the following： pH value, 〈5.5; molar ratio of NaF to TiQ, 0.6; retention time, 80 min and temperature, 80℃. The removal rate of Zr under the optimized conditions was above 87.7%. The adsorption energy of the preferential absorption of hydrofluoric acid for Zr（OH）2SOt（OH2） on the （001） crystal surface of HTD was determined by theo- retical calculation. The possible mechanism of the removal process was also discussed.

关键词： zirconium titanium dioxide removal density functional theory microstructure adsorption

Recovery of titanium and vanadium from titanium–vanadium slag obtained by direct reduction of titanomagnetite concentrates

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Rare Metals 2022年第5期41卷 1688-1696页

作者： Xue-Jie Liu De-Sheng Chen Jing-Long Chu Wei-Jing Wang Yong-Li Li Tao Qi National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemistry and Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

A process of NaOH molten salt roasting-water leaching to treat titanium-vanadium slag obtained by direct reduction of titanomagnetite concentrates was investigated.X-ray diffraction(XRD), scanning electron microscopy(SEM) equipped with energy dispersive spectroscopy(EDS), and thermogravimetry-differential scanning calorimetry(TG-DSC) techniques were used to characterize the samples. The results show that anosovite(Mg_(x)Ti_(3-x)O_(5))and clinopyroxene [Ca(Ti,MgAl)(SiAl)_(2)O_(6)] are the major phases of titanium-vanadium slag. In the NaOH molten salt roasting process, titanium is converted to intermediate product Na_(2)TiO_(3) and vanadium is converted to water-soluble vanadate. The response surface methodology(RSM) was used to optimize the roasting process conditions. NaOH to slag mass ratio(N/S) and roasting temperature are the main influential factors. Under the optimal roasting conditions,i.e., roasting temperature of 550℃, N/S of 1.20, and roasting time of 80 min, the conversions of titanium and vanadium are 96.5 % and 93.0 %, respectively. In the water leaching process, Na_(2)TiO_(3) is converted to amorphous structure of H_(2)TiO_(3) since Na^(+)is exchanged with H^(+). Up to 93.0 % vanadium is leached out under the optimal leaching conditions. Titanium and vanadium in the titanium-vanadium slag can be separated and then recovered.

关键词： Recovery Titanium-vanadium slag Roasting Water leaching Titanomagnetite concentrates

Leaching of vanadium,sodium,and silicon from molten V?Ti-bearing slag obtained from low-grade vanadium-bearing titanomagnetite

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International Journal of Minerals,Metallurgy and Materials 2016年第8期23卷 898-905页

作者： Yuan-yuan Zhu University of Chinese Academy of Sciences Beijing 100049China National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

The water leaching process of vanadium, sodium, and silicon from molten vanadium-titanium-bearing（V-Ti-bearing） slag obtained from low-grade vanadium-bearing titanomagnetite was investigated systematically. The results show that calcium titanate, sodium aluminosilicate, sodium oxide, silicon dioxide and sodium vanadate are the major components of the molten V-Ti-bearing slag. The experimental results indicate that the liquid-solid（L/S） mass ratio significantly affects the leaching process because of the respective solubilities and diffusion rates of the components. A total of 83.8% of vanadium, 72.8% of sodium, and 16.1% of silicon can be leached out via a triple counter-current leaching process under the optimal conditions of a particle size below 0.074 mm, a temperature of 90°C, a leaching time of 20 min, an L/S mass ratio of 4：1, and a stirring speed of 300 r/min. The kinetics of vanadium leaching is well described by an internal diffusion-controlled model and the apparent activation energy is 11.1 kJ/mol. The leaching mechanism of vanadium was also analyzed.

关键词： titanomagnetite vanadium metallurgy leaching kinetics sodium silicon leaching rate

氢氧化钠熔盐分解钛渣制备二氧化钛的热力学分析

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化工学报 2012年第6期63卷 1669-1677页

作者：李洁王勇韩艳芳齐涛中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室北京100190 河北科技大学化学与制药工程学院河北石家庄050031 北京科技大学土木与环境工程学院北京100083

针对我国钛资源特色,采用NaOH熔盐对钛渣进行分解制备二氧化钛是一种生产钛白的新工艺。以酸溶性钛渣(70% 详细信息

针对我国钛资源特色,采用NaOH熔盐对钛渣进行分解制备二氧化钛是一种生产钛白的新工艺。以酸溶性钛渣(70%

关键词：酸溶性钛渣氢氧化钠熔盐热力学分析

Preparation of Cr_2O_3 precursors by hydrothermal reduction in the abundant Na_2CO_3 and Na_2CrO_4 solution

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International Journal of Minerals,Metallurgy and Materials 2012年第11期19卷 978-985页

作者： Guang-ye Wei Jing-kui Qu Yu-dong Zheng Tao Qi Qiang Guo School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Beijing 100190 China Key Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China

Precursors of chromium oxide （p-Cr203） were prepared by reducing hexavalent chromium in the presence of sodium carbonate solution under hydrothermal conditions. Methanal was used as the reductant, and carbon dioxide was the acidulating agent. The influences of reaction temperature, initial pressure of carbon dioxide, isothermal time and methanal coefficient on Cr（VI） reduction were investigated. Ex- perimental results showed that Cr（VI） was reduced to Cr（III） with a yield of 99%. Chemical titration, thermogravimetry （TG）, X-ray diffrac- tion （XRD） analysis, and scanning electron microscopy （SEM） were used to characterize the p-Cr203 and Cr203. The series of p-Cr203 were found to be multiphase even if they presented different colors, from gray green to lavender. After these p-Cr203 samples were calcined, the product of rhombohedral Cr203 with a purity of 99.5wt% was obtained.

关键词： chromium oxide hydrothermal reduction sodium carbonate methanal laterite ores

Synthesis and characterization of Co_3O_4 prepared from atmospheric pressure acid leach liquors of nickel laterite ores

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International Journal of Minerals,Metallurgy and Materials 2018年第1期25卷 20-27页

作者： Long Meng Zhan-cheng Guo Jing-kui Qu Tao Qi Qiang Guo Gui-hua Hou Peng-yu Dong Xin-guo Xi National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Zhengzhou Institute of Emerging Technology Industries Zhengzhou 450000China Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of TechnologyYancheng 224051China Jiangsu Collaborative innovation Center for Ecological Building Materials and Environmental Protection Equipments Yancheng Institute of TechnologyYancheng 224051China

A chemical precipitation-thermal decomposition method was developed to synthesize Co3O4 nanoparticles using cobalt liquor obtained from the atmospheric pressure acid leaching process of nickel laterite ores. The effects of the precursor reaction temperature, the concentration of Co2＋, and the calcination temperature on the specific surface area, morphology, and the electrochemical behavior of the ob- tained Co304 particles were investigated. The precursor basic cobaltous carbonate and cobaltosic oxide products were characterized and ana- lyzed by Fourier transform infrared spectroscopy, thermogravimetric differential thermal analysis, X-ray diffraction, field-emission scanning electron microscopy, specific surface area analysis, and electrochemical analysis. The results indicate that the specific surface area of the Co3O4particles with a diameter of 30 rim, which were obtained under the optimum conditions of a precursor reaction temperature of 30℃, 0.25 mol/L Co2＋, and a calcination temperature of 350℃, was 48.89 m2/g. Electrodes fabricated using Co3O4 nanoparticles exhibited good electrochemical properties, with a specific capacitance of 216.3 F/g at a scan rate of 100 mV/s.

关键词： nickel laterite ores, acid leach liquors synthesis cobaltosic oxide characterization

CO_2在Na_2Cr_2O_7溶液中的平衡溶解度模型(英文)

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物理化学学报 2012年第11期28卷 2567-2573页

作者：周恩年余志辉曲景奎齐涛韩晓英张国庆中国科学院过程工程研究所、湿法冶金国家重点实验室北京100190 中国科学院过程工程研究所、绿色过程与工程院重点实验室北京100190 中国科学院研究生院北京100049 四川安县银河建化集团有限公司四川安县622656

为研究重铬酸钠(Na2Cr2O7)对CO2溶解的影响,本文在带有搅拌的气液相高压平衡釜内,采用静态法测定了温度在313.2-333.2K,压力在0.1-1.9MPa范围内,重铬酸钠浓度分别为0、0.361、0.650、***-1时,CO2在Na2Cr2O7溶液中的溶解度.结果表明:(1)N... 详细信息

为研究重铬酸钠(Na2Cr2O7)对CO2溶解的影响,本文在带有搅拌的气液相高压平衡釜内,采用静态法测定了温度在313.2-333.2K,压力在0.1-1.9MPa范围内,重铬酸钠浓度分别为0、0.361、0.650、***-1时,CO2在Na2Cr2O7溶液中的溶解度.结果表明:(1)Na2Cr2O7对CO2的溶解有盐析效应;(2)CO2在Na2Cr2O7溶液中的溶解符合亨利定律,并且CO2溶解度是温度和Na2Cr2O7浓度的函数,且用改进的Setschenow方程和Peng-Robinson-Pitzer(PR-Pitzer)方程拟合了在此温度、压力及重铬酸钠浓度范围内的实验数据,拟合效果较好,并且其平均相对误差分别为4.24%和3.32%.

关键词： CO2溶解度 Na2Cr2O7溶液热力学模型 Setschenow方程 Peng-Robinson-Pitzer 方程亨利常数

盐酸与硫酸浸出预还原钒钛磁铁矿混合精矿中的Fe,V及Ti

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过程工程学报 2016年第5期16卷 737-743页

作者：肖万海赵宏欣宋宁陈德胜刘亚辉王丽娜齐涛昆明理工大学冶金与能源工程学院云南昆明650093 中国科学院过程工程研究所绿色过程与工程重点实验室湿法冶金清洁生产技术国家工程实验室北京100190

以预还原处理后的钒钛磁铁矿混合精矿为原料,用盐酸浸出其中的铁、钒、钛,考察了各因素对铁、钒、钛浸出率的影响,并对浸出渣进行了物相分析.结果表明,在初始盐酸浓度20%(ω)、液固质量比4:1、浸出温度110℃、浸出时间4 h的优化浸出条件... 详细信息

以预还原处理后的钒钛磁铁矿混合精矿为原料,用盐酸浸出其中的铁、钒、钛,考察了各因素对铁、钒、钛浸出率的影响,并对浸出渣进行了物相分析.结果表明,在初始盐酸浓度20%(ω)、液固质量比4:1、浸出温度110℃、浸出时间4 h的优化浸出条件下,铁、钒的浸出率分别为91.8%和95.0%,钛的浸出率为0.3%;浸出过程中钛是先溶解-再水解沉淀;盐酸浸出液可用于回收铁和萃取提钒;盐酸浸出渣中Ti O2的硫酸分解率达98.2%,可作为硫酸法生产钛白的原料.

关键词：预还原钒钛磁铁矿混合精矿盐酸浸出硫酸分解