EDTA浸取法从冶锌铁渣中回收锌

Retrieving Zinc from Iron-Zinc Slag by EDTA Leaching Method

为了对冶锌铁渣中锌回收利用,以EDTA为浸取剂,对冶锌铁渣进行浸取实验,考察了EDTA浓度、温度、固液比及反应时间对锌浸出效果及选择性的影响。结果表明:EDTA浸取时对锌有较好的浸出率和选择性,能优先浸取锌。EDTA的浓度和液固比对浸取影响高度显著,浸取时间对结果有一定的影响,浸取温度对结果影响较小。在EDTA浓度为0.4 mol/L,浸出温度为20℃,固液比为6 L/kg的条件下反应浸取2 h,锌的浸出率达99.77%。

In order to investigate the leaching efficiency of zinc from iron-zinc slag via EDTA method, the ef-fects of initial concentration of ethylenediaminetetraacetic acid (EDTA), temperature , liquid-solid ratio and reaction time on the leaching rate and selectivity in process of leaching zinc from iron-zinc slag were studied. The results showed that EDTA method exhibited good leaching efficiency and selectivity of zinc, zinc was leached from iron-zinc slag preferentially. When the total EDTA concentration was 0.4 mol/L, the leaching temperature was 20˚C, the ratio of leaching agent volume to zinc dust mass was 6 L/kg and the leaching time was 2 h, the extraction rate of zinc was 99.77%.