Method for recovering valuable metals from copper dross

Abstract

The invention discloses a method for recovering valuable metals from copper dross. The method comprises the following steps of melting the copper dross in a converter, after material melting, respectively removing elements such as lead, bismuth, copper and the like in the dross by oxidizing blowing and blowing the copper dross in three stages according to the oxidation sequence of different metals; and after finishing of blowing oxidation slagging in a third stage, casting the remaining metal into an anode plate and sent to an electrolysis system for electrolysis, the grade of produced silver powder is 95% or above, produced anode slime is sent to a gold production system for gold extraction, and gold is recycled through the processes of nitric acid impurity removal, aqua regia gold leaching and reduction. According to the method, the valuable metals in the copper dross are recycled in stages, precious metals can be recycled from smelting waste residues with high impurity content, produced coarse silver powder with the grade being 95% or above can reach national 1 # silver ingot standard products through secondary casting and electrolytic refining, and gold ingots can reach national 2 # gold ingot standards; and the direct recovery rate of copper and bismuth and the recovery rate of gold and silver can be improved.

Description

technical field [0001] The invention relates to the technical field of precious metal recovery, in particular to a method for recovering valuable metals from copper dross. Background technique [0002] At present, the copper scum produced in the Guizhou Smelting Workshop is usually smelted in a low-blow furnace for returning crude lead. This traditional treatment method has the problem that the gold and silver in the slag cannot be directly recovered, which reduces the direct recovery rate of gold and silver. . Due to the high content of gold and silver in the copper dross, in the traditional treatment process, it will cause the loss of various valuable metals. For example, the efficient separation and extraction of Cu, Pb, Bi, Au and Ag cannot be achieved. It is difficult to achieve comprehensive recycling, and the comprehensive recycling capacity is low, which causes the loss of profits for enterprises and is also a great waste of resources. At the same time, this tradit...

AI Technical Summary

Problems solved by technology

[0002] At present, the copper scum produced in the Guizhou Smelting Workshop is usually smelted in a low-blow furnace for returning crude lead. This traditional treatment method has the problem that the gold and silver in the slag cannot be directly recovered, which reduces the direct recovery rate of gold and silver.

Due to the high content of gold and silver in the copper dross, in the traditional treatment process, it will cause the loss of various valuable metals. For example, the efficient separation and extraction of Cu, Pb, Bi, Au and Ag cannot be achieved. It is difficult to achieve comprehensive recycling, and the comprehensive recycling capacity is low, resulting in the loss of profits for enterprises, which is also a great waste of resources

At the same time, this traditional treatment method also has problems such as cumbersome operation process, extensive process, and low efficiency.

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