Copper scum smelting process

Abstract

The invention discloses a copper scum smelting process comprising the following steps of: carrying out oxidation converting on copper scum to produce silver-copper-bismuth alloy, smoke 1 and oxidizing slag A; electrolyzing the silver-copper-bismuth alloy to produce cathode copper and copper anode mud, leaching the copper anode mud, precipitating bismuth in a leaching agent to obtain bismuth oxychloride, carrying out reduction smelting on the bismuth oxychloride to produce crude bismuth, then precipitating copper to obtain copper hydroxide, and smelting leached slag in a rotary furnace to produce crude silver, smoke 2 and oxidizing slag B; electrolyzing the crude silver to produce finished-product silver and silver anode mud, and recovering gold, platinum and palladium from the silver anode mud; carrying out reduction smelting on the oxidizing slag A and the oxidizing slag B in a blast furnace to obtain lead-antimony alloy, smoke 3 and waste slag, and smelting the lead-antimony alloy in a reverberatory furnace to obtain crude lead A and smoke 4; smelting the smoke 1, 2, 3 and 4 in the reverberatory furnace to produce crude lead B and antimony oxide, and carrying out reduction smelting on the antimony oxide to produce crude antimony; and electrolyzing the crude lead A and the crude lead B to produce lead and lead anode mud, and recovering the gold and silver from the lead anode mud. In the method, the gold silver yield reaches at least 99 percent, the yield of copper, bismuth, lead and antimony reaches at least 98 percent, and the recovery rate of all metals is greatly improved.

Description

Technical field: [0001] The invention relates to a precious metal smelting technology, in particular to a copper scum smelting method. Background technique: [0002] The lead smelting industry produces a large amount of copper dross containing silver, copper, bismuth, antimony, lead and other metals in the crude lead copper removal process. Traditionally, copper scum is mainly treated with soda ash and iron filings to produce crude lead and copper matte. The advantage of this method is high lead recovery rate, but the disadvantage is low copper recovery rate, precious metal dispersion and high slag rate. There are also wet processes using acid leaching and ammonia leaching. The advantage of wet treatment is that the recovery rate of copper is high, but the disadvantage is that a large amount of salty wastewater is produced, and the pressure on environmental protection is great. Invention content: [0003] The object of the present invention is to provide a low-cost, low-p...

AI Technical Summary

Problems solved by technology

The traditional process mainly uses the soda ash iron filings method to treat copper scum, and produces crude lead and copper matte. The advantage of this method is that the lead recovery rate is high, and the disadvantage is that the copper recovery rate is low, precious metals are dispersed, and the slag rate is high.

There are also wet processes using acid leaching and ammonia leaching. The advantage of wet treatment is that the copper recovery rate is high, but the disadvantage is that a large amount of salty wastewater is produced, and the pressure on environmental protection is great.

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