Deep Purification Of Crude Cobalt Manganese Sulfate Solution

In China,cobalt and manganese are two metals of strategic significance.They are widely used in life and production,especially steel and battery material industries.With the rapid development of China’s economy,the demand for cobalt and manganese ores resources is gradually increasing,while the reserve and production of cobalt and manganese ores in China are relatively small.Based on the above situation,it is necessary to study the recovery and utilization of zinc-cobalt-manganese purifying residue leach from hydrometallurgy.Based on the above situation,it is necessary to study the recovery and utilization of the leaching solution of cobalt and manganese purification residue of zinc hydrometallurgy process.In this paper,the leaching solution of cobalt and manganese purification residue of zinc hydrometallurgy process from a plant in Henan province was used as which contain aluminum,calcium,magnesium,and zinc impurity elements,while cobalt and manganese were the target elements.The process of removing aluminum by oxidation and neutralization method→ removing calcium and magnesium by chemical precipitation method→extracting zinc by P 507→separation of cobalt and manganese by P204→back extraction of manganese was determined to obtain a single cobalt sulfate solution and manganese sulfate solution for making battery materials.The results are as follows:(1)The oxidation neutralization method was used to remove aluminum impurity.When pH was 5.0 ±0.2 and the resting time was 12 h,the removal rate of aluminum was 96.43%,and the loss rate of cobalt and manganese was less than 1%.(2)The calcium and magnesium impurities were removed by chemical precipitation method(fluorination method).When the initial pH was 4,manganese fluoride dosage coefficient was 4R,reaction temperature was 90℃ and reaction time was 60 min,the removal rate of calcium was 96.84%,the removal rate of magnesium was 95.53%,and the loss rate of cobalt and manganese was about 1%.(3)The results of removing zinc by manganese powder replacement and solvent extraction were compared.The results of solvent extraction were better than those by manganese powder replacement.P507 was used as the extractant,when the P507 concentration was 20%,saponification degree was 70%,initial pH was 4～4.5,reaction time was 10 min,O/A was 1.5,and reaction temperature was 25℃,the extraction rate of zinc was 99.95%,the loss rate of cobalt was 3.76%and the loss rate of manganese was 17.39%.(4)Cobalt and manganese were separated by solvent extraction.P204 was used as the extractant,when the P204 concentration was 40%,saponification degree was 80%,initial pH was 3～3.5,reaction time was 10 min,O/A was 1,and reaction temperature was 25℃,the extraction rate of manganese was 58.01%and the loss rate of cobalt was 5.61%.The results showed that the single-stage extraction rate of manganese was low and could not meet the experimental requirements,so it was necessary to carry out the multi-stage extraction.After the three-stage countercurrent extraction,the extraction rate of manganese was 88.34%,and the loss rate of cobalt was 0.07%,which met the experimental requirements.(5)In the back extraction experiments of manganese,when the concentration of sulfuric acid was 1.5 mol/L and the ratio of O/A was 0.5,the single-stage back extraction rate of manganese was 78.2%,which did not meet the experimental requirements.After the second-stage back extraction,the back extraction rate of manganese was 99.0%,which met the experimental requirements.