【作者】 向平； 冯其明； 钮因健； 肖功明； 刘伟琪；

【Author】 XIANG Ping~(1,2),FENG Qi-ming~1,NIU Yin-jian~1,XIAO Gong-ming~2,LIU Wei-qi~2 (1.School of Mineral Processing and Bioengineering,Central South University,Changsha 410083,China; 2.Xiangqi Research Institute for Comprehensive Utilization of Mineral Resources,Zhuzhou 412005,China)

【机构】 中南大学资源加工与生物工程学院； 株洲市湘麒资源综合利用研究所；

【摘要】 对株冶电解锌阳极泥开展了用PbS做还原剂硫酸还原浸出二氧化锰的试验研究,纯PbS矿物样还原浸出试验考察了PbS颗粒细度、PbS与MnO₂摩尔比、硫酸与MnO₂摩尔比、浸出反应温度、浸出反应时间等因素对锰浸出率的影响,试验结果表明,PbS颗粒越细,与MnO₂接触的表面积就越大,锰浸出速度就越快;PbS与MnO₂摩尔比、硫酸与MnO₂摩尔比、浸出反应温度、浸出反应时间等对锰的浸出速度有很大影响,在采用0.037～0.074mm的纯PbS条件下,试验获得的最佳浸出条件是PbS:MnO₂摩尔比>0.5,H₂SO₄:MnO₂摩尔比3,浸出反应温度90℃,时间2 h.在较佳条件下用0.037～0.074mm纯方铅矿样做还原剂可获得锰浸出率85%以上的试验指标,在同样条件下用实际硫化铅浮选精矿样做还原剂可获得锰浸出率93%以上的试验指标.实际PbS浮选精矿样还原浸出试验表明ZnS和FeS₂等其它硫化矿物对二氧化锰存在协同还原浸出作用,协同还原浸出作用造成浸出液含杂升高,浸出渣中铅含量降低.因此,如果需要利用含Mn²⁺浸出液制备高纯的锰产品,同时为了便于浸出渣配料入炉冶炼,宜采用品位较高的PbS浮选精矿样做还原剂.更多还原

【Abstract】 An investigation into leaching of MnO₂ from zinc electrolysis anode slime in Zhuzhou Zinc smelter in sulphuric acid solution using PbS as a reductant was carried out.The effects of the fineness of PbS particle,the molar ratio of PbS to MnO₂,the molar ratio of H₂SO₄ to MnO₄,the reaction time and temperature etc.on the leaching rate of Mn were discussed in the batch test that used pure PbS as the reductante.The results revealed that the finer the PbS particles were,the more contact area of PbS particles to MnO₂ was,and so the faster the leaching speed of Mn was obtained.The results also showed that the molar ratio of PbS to MnO₂,the molar ratio of H₂SO₄ to MnO₂,the reaction time and temperature etc.had significant influence on the leaching speed of Mn.The optimal leaching conditions were obtained using 0.5 molar ratio of PbS to MnO₂ and 3 molar ratio of H₂SO₄ to MnO₂ for 120min at 90℃.At the optimal leaching conditions using 0.037⁰.074mm pure PbS as the reductant, more than 85%of Mn leaching rate could be obtained.At the same conditions using PbS flotation concentrates as the reductant,more than 93%of Mn leaching rate could be obtained.The leaching test using PbS flotation concentrate as the reductant showed that the synergistic reductive extraction of ZnS and FeS caused the content of impurities in filtrate be upgraded,as well as the content of Pb in leaching slag be reduced.So that,in order to produce high-purity manganese products using Mn²⁺-containing leaching solution,as well as to facilitate leaching slag into the furnace smelting,it is better to adopt a higher grade flotation concentrate of PbS as the reductant.更多还原