镍钴精炼工艺除镁方法试验研究

Experimental study on the magnesium removalin nickel-cobalt refining process

市场对镍产品的镁含量要求比较严格,因此氢氧化镍钴精炼工艺中镁的去除尤为重要。本文对精炼工艺中除镁进行了两个试验,包括氢氧化镍钴中间产品洗涤除镁和P507萃钴过程除镁,得出以下结论:酸溶前将氢氧化镍钴滤饼进行浆化洗涤,可将其中的Mg洗出42%左右;P507萃钴时,体系达到平衡时,大约40%的镁可被萃取,通过增加洗涤级数,被萃的镁洗出率可达95%~96%。工艺设计中可首先考虑在氢氧化镍钴沉淀过滤工段设置浆化洗涤工序,其次是在P507萃钴工序中设置P507负钴有机洗镁工序。

The market has strict requirements on the magnesium content of nickel products,so the magnesium removal in nickel and cobalt refining process is particularly important.In this paper,two experiments were carried out on the magnesium removal in the refining process,including the magnesium removal by washing the nickel-cobalt hydroxide intermediate product and extracting cobalt by P507,and the following conclusions are drawn.The nickel-cobalt hydroxide filter cake is subjected to slurry washing before acid dissolution,and about 42%Mg can be washed out;when cobalt is extracted by P507,when the system reaches equilibrium,about 40%magnesium can be extracted,and by increasing the number of washing stages,the extraction rate of magnesium can reach 95%~96%.In the process design,it is possible to first consider setting a slurry washing process in the nickel cobalt hydroxide precipitation filtration section,and then setting a P507 negative cobalt organic washing process in the P507 cobalt extraction section.