Treatment process of silver-copper-bismuth alloy

Abstract

The invention discloses a treatment process of a silver-copper-bismuth alloy. The treatment process comprises the following steps of (1) carrying out primary vacuum distillation on a raw material silver-copper-bismuth alloy; (2) carrying out condensation treatment on a primary volatile matter to obtain a lead-bismuth alloy; (3) carrying out secondary vacuum distillation on a primary residue to obtain a secondary volatile matter and a secondary residue; and (4) the secondary volatile matter enters a silver separation furnace to be subjected to silver recovery treatment, and crude silver alloy is obtained. The secondary residues enter a converter, Sb is removed to 2 wt% or below, then electrolytic treatment is carried out, crude copper alloy is obtained, and silver in the anode mud is recycled; all metals are thoroughly separated, other flux ingredients do not need to be added for slagging in the converter reduction and blowing process, and therefore waste residues are not generated in the production process, and waste residues and waste water are not generated in the silver-copper-bismuth alloy vacuum separation process; and the direct recovery rate of Ag in one-time vacuum treatment reaches 99% or above, and the comprehensive direct recovery rate of Ag reaches 99% or above after two-time vacuum treatment.

Description

technical field [0001] The invention relates to the technical field of vacuum metallurgy, in particular to a silver-copper-bismuth alloy treatment process. Background technique [0002] In the face of increasingly fierce competition in the lead smelting industry, enterprises must fully explore the comprehensive recovery capacity of the lead smelting system based on long-term development and consideration, so as to continuously create benefits for the enterprise. The current products produced by our company's precious metal factory are: silver ingots, gold ingots, rough antimony, and silver-copper-bismuth alloys. Because silver-copper-bismuth alloys are intermediate products, direct sales will result in a large loss of precious metals. [0003] During the lead smelting process, a large number of precious metals are enriched in the electrolytic lead anode slime, and the production process of the lead anode slime will produce late slag rich in gold, silver, copper, bismuth and ...

AI Technical Summary

Problems solved by technology

[0005] The advantages of pyrometallurgy are mature technology and low investment, but the disadvantages are low yield of various metals, high energy consumption and high production costs, and a large amount of smelting slag is recovered by returning to the furnace, which is not conducive to the comprehensive recovery of precious metals

The copper content of alloys treated by fire method > 3% cannot be processed by the existing continuous vacuum furnace process, resulting in a large backlog of alloys treated by fire method, and the direct sale of metals has a low valuation coefficient, resulting in a large loss of valuable metals

[0006] The advantage of hydrometallurgy is that it can separate precious metals such as gold, silver, copper, and bismuth. , chlorine waste gas and a large amount of salt wastewater, the cost of wastewater treatment is very high, it is very difficult, and it is difficult to meet environmental protection requirements