Technology of extracting and separating valuable metals such as Pb, In, Sb, Cu and Sn from lead smelting converter slags

Abstract

The invention relates to a technology of extracting and separating valuable metals such as Pb, In, Sb, Cu and Sn from lead smelting converter slags, comprising the following steps: adding carbonaceous reducing agent in raw materials which are produced in the process of crude lead smelting and contain Pb, In, Sb, Cu and Sn; smelting the raw materials and the carbonaceous reducing agent in an electric furnace or a reverberatory at the temperature over 1000 DEG C, reducing the Pb, Cu, Sb, Sn, In and the like into metals and forming alloy, sorting out silicon and other components as slags; mixing sodium hudroxide with weight accounting for 40-60% of the alloy weight into the alloy, adding oxidizer and copper removal agent with weight accounting for 5-20% of the alloy weight, oxidizing the In, Sn, Sb and Cu for slagging and extracting the metallic lead; washing oxidizing slags to extract Sn, neutralizing the Sn by adding acid through washing water, regulating pH value to 3-4 and obtaining tin slags; obtaining stibium slags after acid leaching and separating of washing slags; obtaining copper sponge by replacement with ferrous powder by pickle liquor; extracting indium from replaced liquid and extracting organic phase by adopting TBP+octanol+karaffin oil, with extraction phase ratio of O / A equal to 1:1. The direct yield and recovery rate of metallic In, Pb, Sn and Sb are respectively over 90% and 95%.

Description

【Technical field】 [0001] The invention belongs to the technical field of extraction of nonferrous metals, and relates to a process for extracting and separating valuable metals of lead, indium, antimony, copper and tin from lead smelting converter slag. 【Background technique】 [0002] In addition to lead and zinc, lead-zinc ore also contains a small amount of non-ferrous metals such as indium, antimony, copper and tin. These metals will be enriched in the smelting slag during the smelting process. Considering resource utilization and enterprise benefits, it is necessary to The associated metals are comprehensively recovered, especially metal indium. Since there are few independent indium ores in nature, its extraction mainly depends on the comprehensive recovery in the lead-zinc smelting process. The lead-zinc smelting process can be divided into wet process and pyrotechnics. When using pyrotechnics to smelt lead and zinc, a material containing lead, indium, antimony, copper...

AI Technical Summary

Problems solved by technology

At present, lead and zinc smelting enterprises mainly focus on the extraction and recovery of high-value indium in the treatment of this material. The main processes used are full wet method or wet extraction process after enrichment with alkali, while for other valuable metals copper, antimony, Less consideration is given to tin recycling, especially tin and antimony recycling

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