High-tellurium copper slag treatment method

Abstract

The invention discloses a high-tellurium copper slag treatment method. The high-tellurium copper slag treatment method comprises the following steps of: (1) ball-milling; (2) acidifying; (3) low-acid leaching; (4) bismuth precipitating; (5) copper precipitating; (6) high-acid pickling; (7) gold, sliver and lead recycling; (8) solution replacing; (9) antimonium precipitating; (10) tellurium leaching; (11) purifying; (12) neutralizing and tellurium precipitating; and (13) electrolyzing and tellurium extracting. The method disclosed by the invention can be adopted to clean and efficiently treat copper slag, comprehensively recycles noble metals such as gold, silver, tellurium, antimonium, bismuth and copper, and radically solves the problems such as a lagged process, poor comprehensive utilization, a low metal recovery rate and severe environmental pollution of the conventional method.

Description

technical field [0001] The invention relates to a method for treating high tellurium copper slag. Background technique [0002] Electrolysis is a common method for lead smelting. Before the crude lead enters the electrolysis, it needs to be refined by pyrolysis to remove impurities. The copper slag produced in the process of pyro-refining and impurity removal also contains a variety of valuable metals such as tellurium, copper, antimony, bismuth, lead, gold, silver, etc., and exists in the state of metal, which has the value of further separation and treatment. The traditional separation treatment method is: first roasting and oxidation to make the valuable metal form an oxidized form, and then wet treatment to achieve the purpose of further separation. [0003] However, during the roasting process, a large amount of material loss will be caused, the environment will be polluted by smoke and exhaust gas, the operating conditions will be harsh, and the labor intensity will ...

AI Technical Summary

Problems solved by technology

[0003] However, during the roasting process, a large amount of material loss will be caused, the environment will be polluted by smoke and exhaust gas, the operating conditions will be harsh, and the labor intensity will be high; acid leaching is required in the wet treatment process, and a part of silver and gold will often be leached in the solution during the acid leaching process. When antimony and bismuth are precipitated, gold, silver and tellurium are distributed in antimony and bismuth slag. Sometimes the gold content in sponge copper is as high as 60g / t, the silver content in antimony mud is as high as 6000g / t, and the silver content in bismuth mud is as high as 1500g / t. Cause gold and silver to disperse, recovery is difficult, and secondary refining is required; moreover, the leaching effect of tellurium in antimony mud and bismuth mud is not good, the grade of tellurium dioxide is low, and the recovery rate of gold, silver and tellurium is low