In order to recycle zinc from zinc oxide of the waste galvanized sheet zinc-borne dust, two-stage neutral-acid continuous leaching process was conducted. Through the conditional tests, the optimal technical parameters for the neutral leaching were determined as the initial acid concentration 0 g/L, the ratio of liquid to solid 9 mL/g, stirring intensity of 200 r/min, the leaching temperature of 25 ℃ for 80 min, for the acid leaching as the starting acid concentration of 20 g/L, the ratio of liquid to solid 9 mL/g, stirring intensity of 500 r/min, the leaching temperature of 25 ℃ for 80 min. Then under the technical parameters above, a closed-circuit test was made by using the neutral leaching solution as output solution, and the acid leaching return to the neutral leaching solution. In the tests, Zn leaching rate reaches 90. 36%. Zn content in leaching solution is 10. 14 g/L, and iron content is 0. 56 g/L only.%为回收某废镀锌板炼钢烟尘中以氧化锌为主的锌,对其进行了中性—酸性两段浸出试验.首先通过条件试验确定了中性浸出时的适宜工艺参数为始酸浓度0g/L、液固比9 mL/g、搅拌强度200 r/min、浸出温度25℃、浸出时间80 min,酸性浸出时的适宜工艺参数为始酸浓度20 g/L、液固比9 mL/g、搅拌强度500 r/min、浸出温度25℃、浸出时间80 min,然后按所确定的工艺参数进行中性浸出液为产出液、酸性浸出液返回中性浸出作业的闭路流程试验,试验稳定后锌的浸出率达到90.36％,浸出液中锌的含量为10.14g/L,铁含量仅为0.56 g/L.
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