电解锰渣中锰元素的浸取研究

发布时间：2018-05-03 16:03

  本文选题：电解锰渣 + 电场　； 参考：《重庆大学》2015年硕士论文

【摘要】：电解锰是冶金、航天、化工等工业部门的关键基础材料。然而,我国电解锰产业在快速发展的同时,也面临着巨大的资源和环境压力,尤其是电解锰渣的无害化处理和资源化利用已成为日益突出的问题。锰渣中含有大量锰元素,而锰元素的回收不仅能减轻环境污染,而且还能创造巨大的经济效益。实验发现电解锰渣库存堆积一定时间后,其物理化学性质发生了明显变化。传统浸出方法不能实现旧渣中锰元素的高效浸出,于是本文提出电场强化与药剂强化旧电解锰渣的浸出研究。在电场强化锰渣浸出的过程中,探索了浸锰的条件,并对浸锰条件进行了优化。通过实验可知:室温(25℃)条件下,当液固质量比为5:1,,电流密度为250A/m2,硫酸体积浓度为1%,浸出时间为1h,锰浸出率可达到89.15%。继续增加液固质量比、电流密度、硫酸体积浓度、浸出时间等,浸出率增加不明显,反而加大了浸出过程的成本和能耗。对电场强化浸出后的浸出液进行了锰回收实验研究。研究发现浸出液中存在铁杂质,为了得到比较纯净的锰产品,在浸出液中加入少量软锰矿,50℃下通入空气1h,调节p H值至6.0,加入少量活性炭,冷却后抽滤,对浸出液进行除杂净化。然后,采用碳化沉淀法对浸出液中锰元素进行了回收,回收率为97.77%,沉淀中锰元素含量为43.47%,沉淀的物相主要是Mn3O4,Mn O2和Mn CO3。锰渣在长期存放过程中逐渐凝结成坚硬的块状,而且低价锰逐渐被氧化为二氧化锰,在酸性溶液中引入电场,会有H·自由基生成,而H·自由基可以将Mn O2还原为Mn2+溶解在溶液中。从而使不溶的二氧化锰溶解。而且,电场可以改变二氧化硅、二水硫酸钙等脉石矿物表面的电荷分布,促使颗粒相互碰撞,使包裹在锰颗粒周围的脉石矿物解散。这样含锰颗粒就会被阴极产物还原浸出。在药剂强化锰渣浸出实验中发现,常温条件下,草酸和水合肼强化锰渣中锰元素的浸出效果较好。草酸强化锰渣浸出的较优工艺条件为,草酸与锰渣质量比为4%,硫酸体积浓度为1.0%,液固质量比为5:1,反应时间为1h。水合肼强化锰渣浸出过程,在水合肼体积浓度为0.5%,硫酸体积浓度为1.0%,液固质量比为4:1,反应时间为1h的条件下,锰浸出率达到90.91%。
[Abstract]:Electrolytic manganese is a key basic material in metallurgical, aerospace, chemical and other industrial sectors. However, with the rapid development of electrolytic manganese industry in China, it is also facing great pressure of resources and environment. Especially, the harmless treatment and utilization of electrolytic manganese slag has become an increasingly prominent problem. Manganese residue contains a large amount of manganese elements, and the recovery of manganese elements can not only reduce environmental pollution, but also create great economic benefits. It was found that the physical and chemical properties of electrolytic manganese slag changed obviously after a certain period of storage. The traditional leaching method can not realize the high efficiency leaching of manganese in the old slag, so the electric field strengthening and the medicament strengthening the leaching of the old electrolytic manganese slag are put forward in this paper. In the process of leaching manganese slag by electric field, the conditions of manganese leaching were explored, and the conditions of manganese leaching were optimized. Under the condition of 25 鈩，

本文编号：1839156