Hydrometallurgical Treatment for Mixed Waste Battery Material

3rd International Conference on Advanced Materials Research and Applications

Ma, L.W.^1 ; Xi, X.L.^1 ; Zhang, Z.Z.^1 ; Huang, Z.Q.^1 ; Chen, J.P.^1

College of Material Science and Engineering, Beijing University of Technology, Beijing

100124, China^1

关键词: Cobalt-nickel-copper;    Di(2-ethylhexyl)phosphoric acid;    Hydrometallurgical experiments;    Hydrometallurgical treatments;    Potassium permanganate;    Precipitation efficiency;    Selective precipitation;    Thermodynamic calculations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/170/1/012024/pdf
DOI  :  10.1088/1757-899X/170/1/012024

来源: IOP

【 摘 要 】

Hydrometallurgical experiments are generally required to assess the appropriate treatment process before the establishment of the industrial recovery process for waste battery materials. The effects of acid systems and oxidants in metal leaching were studied. The comprehensive leaching effects of the citric acid were superior to the sulfuric acid. The potassium permanganate inhibits the dissolution of metals. Thermodynamic calculations showed that metals precipitate more easily in sulfuric acid system than in citric acid system. The Fe precipitation efficiency in sulfuric acid system was 90% at pH 3.5, but with considerable losses of Co (30%) and Ni (40%). The proper pH and organic/aqueous (O/A) ratio for Fe and Zn removal with Di-(2-ethylhexyl) phosphoric acid extraction were 2 and 0.5, respectively; while for the removal of Cu and Mn, the best pH and O/A ratio were 3 and 0.75, respectively. Crude manganese carbonate and a cobalt-nickel enriched liquid were obtained by selective precipitation in raffinate using an ammonium bicarbonate solution. In citric acid systems, the precipitation efficiency of Co, Ni, Mn, Fe, Cu and Zn were less than 20% at pH 7. The proper pH and O/A ratio for the separation of the metals in two groups (Ni/Co/Cu and Mn/Fe/Zn) were 1.5 and 2. The cobalt-nickel-copper enriched liquid was finally obtained.