从低品位氧化锰矿中综合回收镍钴

研究了从低品位氧化锰矿经还原焙烧、硫酸浸出得到的含钴镍原料液中回收钻镍的工艺.结果表明:控制原料液初始pH值低于2有利于防止钴镍及锰形成氢氧化物沉淀而损失.分别以Na2S,BaS,MnS作为沉淀剂沉淀镍、钴,在pH值分别大于3.5,4,2时,钴镍的沉淀率分别达到97%,86%,99%以上.但Na2S,BaS会引入杂质,同时会因所需的溶液初始pH值较高而造成钴镍和锰的损失,因此不适宜作为回收钴镍的沉淀剂;而MnS在pH值小于2条件下可将98%以上的镍钴沉淀回收,且不会引入新的杂质及造成溶液中钴镍和锰的损失,因此MnS是从含锰溶液中回收钴镍的较合适的沉淀剂.

Comprehensive Recovery of Ni-Co from Low Grade Manganese Oxide Ore

Study is made on the process for recovering Ni and Co from the Ni and Co containing solution prepared from low grade manganese oxide ore by reductive roasting and sulfuric acid leaching. The results show that to control the initial pH value of the leaching solution to be under 2 is beneficial to the prevention of Ni and Co loss by their formation into hydroxide precipitates with manganese. When Na2S,BaS and MnS are used as the precipitators for Ni-Co respectively at a pH value of 3.5,4 and 2 respectively, the precipitation rate of Ni-Co can be greater than 97%, 86% and 99% respectively. However, Na2S and BaS can introduce impurities and thus will require a higher initial pH value of the solution, which may lead to the loss of Ni-Co and manganese. Therefore, they are not suitable to be used as the precipitators for Ni-Co recovery. MnS can precipitate and recover over 98% Ni and Co at a pH value of below 2 and will not introduce into the solution new impurities that may lead to the loss of Ni-Co and manganese. Therefore, MnS is comparatively suitable to be used as the precipitator for recovering Ni and Co from manganese-containing solution.