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有色金属(冶炼部分):2021,(4):48-52
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亚硫酸钠助浸剂提高硫酸体系中钒铬废渣钒浸出率的研究
(1.武汉科技大学 资源与环境工程学院;2.国家环境保护矿冶资源利用与污染控制重点实验室;3.钒资源高效利用湖北省协同创新中心)
Study on Improving Vanadium Leaching Rate of V-Cr waste residue in Sulfuric Acid System Assisted with Sodium Sulfite
ZHANG Qian1,2,3,4, LIU Tao1, ZHANG Yi-min, XUE Nan-nan, ZHENG Qiu-shi
(1.School of Resource and Environmental Engineering, Wuhan University of Science and Technology;2.State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control;3.Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources;4.Hubei Provincial Engineering Technology Research Center of High efficient Cleaning Utilization for Shale Vanadium Resource)
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投稿时间:2020-10-31    修订日期:2020-11-08
中文摘要: 通过在钒铬废渣硫酸直接酸浸工艺中添加亚硫酸钠助浸剂浸出钒钼,系统研究了亚硫酸钠用量、浸出温度、硫酸体积浓度、浸出时间对钒和钼浸出率的影响。结果表明,在亚硫酸钠用量12%、温度25 ℃、硫酸体积浓度20%、浸出时间2 h的最佳条件下,钒浸出率为94.55%(较未添加亚硫酸钠提高了11.84个百分点),钼浸出率为90.46%,铬、铁等其他金属元素浸出率均在5%以下。通过XRD、热力学分析可知,亚硫酸钠的添加显著降低了钒溶出反应的ΔG,促进钒酸钙还原浸出而提高钒浸出率,钼酸钙的酸溶液易溶性未发生改变,而三氧化二铬以及类质同象存在于其晶格的杂质元素铁因结构稳定,均难以溶出。
中文关键词: 钒铬废渣  亚硫酸钠  还原浸出    
Abstract:Vanadium and molybdenum in V-Cr waste residue were leached in sulfuric acid with addition of sodium sulfite. Effects of amount of sodium sulfite, leaching temperature, volume concentration of sulfuric acid, and leaching time on leaching rate of vanadium and molybdenum were systematically studied. The results show that vanadium leaching rate is 94.55% (11.84 percent point improvement compared with no addition of sodium sulfite), molybdenum leaching rate is 90.46%, meanwhile, and leaching rate of other metal elements such as chromium or iron are below 5% under the optimum conditions including sodium sulfite dosage of 20%, leaching temperature of 25 ℃, volume concentration of sulfuric acid of 12%, and leaching time of 2 h. According to XRD and thermodynamic analyses, addition of sodium sulfite significantly reduces ΔG of vanadium dissolution reaction, promotes reductive leaching of calcium vanadate and raises vanadium leaching rate. The easily dissolved properties of calcium molybdate in acid solution does not affected, while chromium trioxide and impurity element iron which exist in crystal lattice of chromium trioxide are difficult to dissolve due to stable structure.
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基金项目:国家重点研发计划项目(2018YFC1900500);国家自然科学基金青年基金资助项目(51804226);湖北省高等学校优秀中青年科技创新团队项目(T201802)
引用文本:
张倩,刘涛,张一敏,薛楠楠,郑秋实.亚硫酸钠助浸剂提高硫酸体系中钒铬废渣钒浸出率的研究[J].有色金属(冶炼部分),2021(4):48-52.
ZHANG Qian,LIU Tao,ZHANG Yi-min,XUE Nan-nan,ZHENG Qiu-shi.Study on Improving Vanadium Leaching Rate of V-Cr waste residue in Sulfuric Acid System Assisted with Sodium Sulfite[J].Nonferrous Metals (Extractive Metallurgy),2021(4):48-52.

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