Study on Single-stage Acid Leaching of Zinc Calcine

The test on single-stage acid leaching of zinc calcine had been proceed.The effects of stirring speed,particle size,leaching temperature,initial acidity of sulfuric acid and ratio of liquid to solid were studied on the leaching rates of zinc and iron.The results showed that initial acidity of sulfuric acid and liquid-solid ratio were the most important factors on leaching.Under the condition of leaching temperature 55℃,initial acidity of sulfuric acid 120 g/L,leaching time 0.5 h,liquid-solid ratio 6 ∶ 1 and stirring rate 500 r/min,the leaching rate of zinc and iron was 81.33% and 3.45% respectively,which basically achieved selective leaching of zinc and iron.