高磷高铁锰矿为原料制备电解金属锰

Preparation of Electrolytic Manganese from High Phosphorus Ferromanganese Ore

传统电解锰生产中会使用大量硫酸,既不环保,对设备要求也较高。实验采用硫酸盐焙烧—浸出氧化锰的方法制备锰电解液,最后电解制得金属锰。通过高温焙烧氧化锰矿与黄铁矿的混合物,四价锰会转化为水溶性二价锰,从而制得Mn SO4溶液,而混合物中的其他杂质元素则生成与之对应的非水溶性氧化物而被滤掉。焙烧后的熟料直接用水代替酸来浸出。实验结果表明:当S/Mn摩尔比为3,煅烧温度为640℃,煅烧时间为270 min,矿粉粒径为0. 074 mm(200目)左右时,试验结果最佳,其中Mn的综合浸出率可达85. 6%。电解实验中,当Se O2添加剂的用量为0. 05 g/L时,电解效率可达70%,产品质量可达到国家通用B级。

Traditional electrolytic manganese production will need a large number of sulfuric acid.That is,not only environmental protection,but also the equipment requirements are higher.Manganese electrolyte was prepared by sulfate roasting and leaching of manganese oxide.Finally,manganese metal was prepared by electrolysis.By roasting the mixture of manganese oxide and pyrite at high temperature,the tetravalent manganese can be converted into water-soluble divalent manganese.MnSO 4 solution can be obtained,while the other impurity elements in the mixture form the corresponding insoluble oxides are filtered out.After roasting,the clinker is leached with water instead of acid.The experimental results show that when the molar ratio of S/Mn is 3,the calcination temperature is 640℃and the calcination time is 270 min.When the particle size of min is about 0.074 mm(200 mesh),the test results are the best,and the comprehensive leaching rate of Mn can reach 85.6%.In the electrolysis experiment,when the dosage of SeO 2 additive is 0.05 g/L,the electrolysis efficiency can reach 70 g/L,and the product quality can reach the national general B grade.