铅阳极泥氧化预处理工艺研究

铅阳极泥是粗铅电解精炼的中间产物,含有大量可进一步提取的有价伴生元素,如金、银、铅等元素。本文从生产实际出发,对铅阳极泥湿法预处理工艺进行研究,采用双氧水对铅阳极泥进行氧化预浸处理,并确定了最佳氧化预浸条件。试验表明,在双氧水用量为40 g、溶液盐酸浓度为4.5 mol/、液固比为6∶1、浸出时间为3 h、浸出温度为80℃的条件下,铅阳极泥氧化预浸效果良好,Bi、Sb浸出率均可达到98%以上,As、Cu浸出率达到90%以上,浸出液中Au浓度低于0.1 mg/L,Ag浸出浓度低于30 mg/L,渣率降低至25%以下。本工艺过程简单,成本低,为铅阳极泥处理提供了一条新途径。

Study on the Oxidation Pre-treatment Process of Lead Anode Mud

Lead anode mud was an intermediate product obtained by crude lead electrolytic refining,which contained a large number of valued accessory elements that can be further extracted,such as gold,silver,lead and other elements. Based on the actual production,the wet pretreatment process of lead anode slime was studied in this paper. The lead anode slime was oxidized by hydrogen peroxide,and the optimum oxidation prepreg conditions were determined. The results showed that under the conditions of hydrogen peroxide dosage of 40 g,hydrochloric acid concentration of 4. 5 mol/L,liquid-solid ratio of 6∶ 1,leaching time of 3 h,and leaching temperature of 80 ℃,the oxidation pre-leaching effect of lead anode slime was good,the leaching rate of Bi and Sb could reach more than 98%,and the leaching rate of As and Cu reached more than 90%,the concentration of Au in leaching solution below 0. 1 mg/L,the leaching concentration of Ag was less than 30 mg/L,and the slag rate was reduced to less than 25%. The process was simple and low cost,which provided a new way for the treatment of lead anode mud.