高铜高砷烟灰加压浸出工艺

Pressure leaching technique of smelter dust with high-copper and high-arsenic

研究了加压浸出在高铜高砷烟灰浸出中的应用。结果表明：高铜高砷烟灰加压浸出较优的工艺条件为，液固比（mL／g）为5：1，初始硫酸浓度为0．74mol／L，浸出温度453K，氧分压0．7MPa，浸出时间2h，搅拌转速500r／min；在该条件下，Cu、Zn浸出率分别约95％和99％，As浸出率约20％，Fe浸出率仪6％左右：Cu、Zn与As、Fe的分离效果较好，该浸出工艺运行效果良好且稳定。

The application of pressure leaching technology in the treatment of high-copper and high-arsenic smelter dust was studied. The results show that the optimal pressure leaching technique of copper smelter dust is determined as follows： the liquid to solid ratio （mL/g） of 5：1, the initial sulfuric acid concentration of 0.74 mol/L, the leaching temperature of 453 K, the oxygen partial pressure of 0.7 MPa, the agitation speed of 500 r/min. Under these conditions, the leaching rates of copper and zinc arrive at 95% and 99%, respectively, while those of arsenic and iron are approximately 20% and only 6%. Copper and zinc can be effectively separated from arsenic and iron in the leach. The pressure leaching technique of high-copper and high-arsenic smelter dust is further proved to be effective and stable.