Experimental Study on Selective Leaching Separation and Recovery of Copper from Zinc-Copper Alloy Ash
Zinc-copper alloy ash contains Cu,Zn,Al,Ni,Sn,Pb and other non-ferrous metals.In this paper,the effective treatment of zinc-copper ash in different particle size ranges is realized by screening.The effects of sulfuric acid content,temperature,time,liquid-solid ratio,rotation speed,oxidant and roasting conditions on the selective leaching of different metals were investigated.The results show that the zinc-copper ash with particle size less than 0.15 mm is calcined at 750 ℃ for 3 hours,and then leached at 85 ℃,sulfuric acid content of 1.2 g/g ash,liquid-to-solid ratio of 5/1,stirring speed of 400 r/min,H2O2 0.075 mL/g ash for 5 h.The removal rate of zinc is 93.40％,and the removal rate of copper is 0.23％.Compared with the initial copper ash,the ZnO in the copper ash after roasting and leaching is greatly reduced.The leaching residue was mixed with copper slag with a particle size of 0.15～0.25 mm,roasted at 750 ℃ for 4 hours,and then washed with 2 mol/L sulfuric acid solution for 5 hours and washed with water under the same conditions.The steps can remove a large number of impurity metal elements in the copper slag.The phase composition of the copper slag after pickling is mainly Cu,and the proportion of Cu elements reach 92.52％.
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