Abstract:Applying cathode material of spent ternary lithium-ion batteries as raw material, nickel cobalt and lithium in cathode material were effectively recovered through leaching, chemical precipitation, extraction and separation. Firstly, the influence of various factors of H2SO4 and H2O2 system on leaching effect was investigated. The optimum leaching conditions were determined as follows: leaching temperature 90℃, acid/material ratio 2:1, H2O2/material (mL/g) 1.33, liquid/solid ratio (mL/g) 10:1, leaching time 1h. The leaching rate of nickel, cobalt, manganese and lithium could reach more than 99% under these conditions. The leaching solution was neutralized and precipitated with 30% NaOH solution for 2h, the temperature was 90℃, and the terminal pH value was 3.7. After iron removal, the content of iron in the solution was less than 0.005g/L, and the loss of nickel and cobalt was less than 1%. After iron removal, manganese was extracted from the solution by P204, nickel and cobalt were separated by P507 to prepare cobalt products, nickel was extracted by P204 to prepare nickel products, and the remaining lithium sulfate solution was concentrated and then lithium was precipitated by sodium carbonate.