The lead content of lead-zinc slag in a certain zinc smelting plant is 43.89％,and the zinc content is 14.29％,among them,zinc has not been effectively recovered,resulting in resource waste.The experiment explores the optimal conditions for zinc recovery from lead-zinc slag through a combination of roasting and acid leaching.The results show that after roasting lead-zinc slag at 600 ℃ for 40 min,under the conditions of leaching temperature of 85 ℃,leaching time of 2 h,final acid concentration of 25 g/L,and calcium-silicon ratio of 1.5,the zinc grade of lead-zinc slag decreases to less than 1％after leaching,the zinc recovery rate exceeds 95％,and the leaching residue meets the sales requirements of lead-zinc slag,effectively achieving lead-zinc separation and efficient recovery and utilization of lead-zinc resources.
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