Abstract: As important secondary resource,zinc smelting slag contains a large amount of valuable metals,making it worth utilizing as resources.For the waste slag produced by a domestic zinc smelting enterprise,the silver grade is 418 g/t and the lead grade is 8.98 %.The lead and silver are leached and recovered by the chloride salt method.The effects of the amount of sodium chloride,sodium chlorate and hydrochloric acid,leaching temperature,leaching time and liquid-solid ratio on the leaching rate of lead and silver were investigated respectively.The best process conditions are as follows:sodium chloride dosage is 410 g/L,hydrochloric acid dosage is 10 mL,liquid-solid ratio is 9∶1,and leaching temperature is 90 ℃ for full leaching for 2.5 h.Under the best conditions,the leaching rates of lead and silver are 95.4 % and 90.5 %,respectively.