硫酸熟化—常压浸出综合回收锡烟尘中铟锌试验研究

Experimental Study on Recycling Indium and Zinc from Tin Flue Dust by Using Sulfuric Acid Curing Immersion and Leaching at Atmospheric Pressure

某锡烟尘含Sn 37.43%、Zn 8.82%、In 0.56%,具有较高的综合回收价值。采用硫酸熟化—常压浸出工艺回收烟尘中的有价金属铟、锌,而锡有效富集在渣中。通过条件试验确定适宜的工艺参数为熟化温度140℃,熟化保温时间40 min,硫酸与锡烟尘质量比0.7∶1,浸出时间1.5 h,浸出温度90℃,浸出液固比4∶1 m L/g。在此条件下,铟和锌的平均浸出率分别达到96.68%和97.70%,锡的平均浸出率降低到0.52%。与常压酸浸提取工艺相比,硫酸熟化常压浸出工艺可显著提高铟和锌的浸出率,并显著降低锡的浸出率,实现了铟、锌与锡的高效分离。

A tin dust contains Sn of 37.43%,Zn of 8.82%and In of 0.56%,which has a high comprehensive recovery value.The valuable metals indium and zinc were recovered by sulphuric acid-atmospheric leaching process,while tin was effectively enriched in the slag.The optimum parameters were determined by the experimental conditions as curing temperature of 140℃,curing holding time of 40 min,mass ratio of sulfuric acid to tin smoke and dust of 0.7∶1,leaching time of 1.5 h,leaching temperature of 90℃,leaching liquid-solid ratio of 4∶1 mL/g.Under these conditions,the average leaching rates of indium and zinc reached 96.68%and 97.70%respectively,and the average leaching rates of tin decrease to 0.52%.Compared with the atmospheric acid leaching process,the leaching rate of indium and zinc can be significantly increased by sulfuric acid curing atmospheric pressure leaching process,and the leaching rate of tin can be significantly reduced,which realizes the efficient separation of indium,zinc and tin.