Method for refining bismuth from bismuth oxide slag

Abstract

The invention discloses a method for refining bismuth from bismuth oxide slag. The method comprises grinding treatment for the bismuth oxide slag, dechloridation treatment, copper-bismuth separation treatment, distillation silver removal, lead removal treatment and waste treatment. The method comprises the following steps: step 1, carrying out grinding treatment for the bismuth oxide slag; step 2,carrying out dechloridation treatment; step 3, carrying out copper-bismuth separation treatment; step 4, carrying out distillation silver removal; step 5, carrying out lead removal treatment; and step 6, carrying out waste treatment. The step of the grinding treatment for the bismuth oxide slag is designed before extracting refined bismuth from the bismuth oxide slag, crushing treatment can be carried out on bismuth oxide, the refining efficiency for the bismuth oxide slag can be increased, and then heating treatment is carried out for preheating raw materials, so that on one hand, the heating time length of the subsequent steps can be increased, and on the other hand, the refining effect of a whole refining process can be improved; and the waste treatment is designed in the last step ofextracting refined bismuth in the bismuth oxide slag, and the impurities of the refined bismuth can be sieved out through a filter sieve, so that the purity of the refined bismuth is improved.

Description

technical field [0001] The invention relates to the technical field of refining bismuth from bismuth oxide slag, in particular to a method for refining bismuth from bismuth oxide slag. Background technique [0002] Smelters use bismuth oxide as a raw material to produce refined bismuth. At present, there are two common production and refining methods, namely wet smelting followed by fire and pyro smelting. [0003] The smelting process of wet method first and fire method uses bismuth oxide slag as raw material. After ball milling, hydrochloric acid is added for leaching. The leaching slag is returned to the anode slime smelting system for silver recovery. The leaching solution is neutralized to obtain bismuth oxychloride and after neutralization Liquid, bismuth oxychloride is put into the converter to be reduced and smelted, press-filtered, and dried to become coarse bismuth. Chlorine gas removes lead and zinc, and refined bismuth is obtained after high-temperature refining...

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned traditional refining process is not as effective as possible and is prone to produce a large amount of waste water and waste residue to pollute the environment. On the other hand, there are a large number of physically separable impurities in the refined bismuth, resulting in impurity of the refined bismuth.