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A smelting method and technology for copper scum, applied in the smelting field of precious metals, can solve the problems of high environmental protection pressure, high copper recovery rate, low copper recovery rate, etc. Effect
Inactive Publication Date: 2011-03-30
SIHUI CITY HONGMING PRECIOUS METALS +1
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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
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[0013] Example 1:
[0014] The raw material of copper dross is 12 tons, and its components are: silver 1.5wt%, copper 36.5wt%, lead 32wt%, antimony 16wt%, bismuth 3.2wt%, tellurium 0.3wt%, gold 30g / T.
[0015] (1) Put the copper dross into the smelting furnace, oxidize and smelt at 700~1200℃, add sodium carbonate to remove antimony, and add silicon to remove lead. Most of the lead and antimony enter the dust 1 and oxide slag A, while gold, silver, copper, bismuth, tellurium Enter the alloy to form a silver-copper-bismuth alloy, which is directly cast into a copper anode plate. The components of the copper anode plate are: copper 82wt%, silver 3.4wt%, bismuth 7.18wt%, tellurium 0.62wt%, gold 68g / T, lead 3.5wt%, antimony 1.6wt%.
[0016] (2) The silver-copper-bismuth alloy is electrolyzed to produce cathode copper, gold, silver, bismuth, tellurium and other metals are enriched in the copper anode slime. The copper anode slime is leached with pH 0.5 dilute hydrochloric acid, and the le...
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[0022] Example 2:
[0023] The raw material of copper dross is 18 tons, and its components are: silver 0.5wt%, copper 20wt%, lead 45wt%, antimony 21wt%, bismuth 2.5wt%, tellurium 0.3wt%, gold 18g / T.
[0024] (1) Put the copper dross into the smelting furnace, oxidize and smelt at 700~1200℃, add sodium carbonate to remove antimony, and add silicon to remove lead. Most of the lead and antimony enter the dust 1 and oxide slag A, while gold, silver, copper, bismuth, tellurium Enter the alloy to form a silver-copper-bismuth alloy, which is directly cast into a copper anode plate. The components of the copper anode plate are: copper 81.5wt%, silver 2.1wt%, bismuth 10.4wt%, tellurium 1.1wt%, gold 76g / T, lead 3.0wt%, antimony 1.8wt%.
[0025] The following steps are the same as steps (2) to (6) of Example 1.
[0026] After the copper dross is smelted by the smelting method of this embodiment, the direct yield of gold is 99.2%, the direct yield of silver is 99%, and the yield of copper, bismu...
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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 removal process. The traditional process mainly uses the soda ash iron filing method to process the copper scum to produce crude lead and copper matte. The advantage of this method is the high lead recovery rate, but the disadvantage is that the copper recovery rate is low, the precious metal is scattered, and the slag rate is high. There are also wet processes that use 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 salt wastewater is generated and environmental protection pressure is high. Summary of the invention: [0003] The purpose of the present inventio...
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