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Copper scum smelting process
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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: 2012-08-29
SIHUI CITY HONGMING PRECIOUS METALS +1
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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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Embodiment 1
[0014] 12 tons of copper dross raw materials, its composition is: silver 1.5wt%, copper 36.5wt%, lead 32wt%, antimony 16wt%, bismuth 3.2wt%, tellurium 0.3wt%, gold 30g / T.
[0015] (1) Add copper scum into the smelting furnace, oxidize blowing at 700-1200°C, add sodiumcarbonate to remove antimony, add silicon to remove lead, most of the lead and antimony enter the soot 1 and oxide slag A, while gold, silver, copper, bismuth and tellurium Into the alloy, a silver-copper-bismuth alloy is formed, which is cast directly 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) Electrolyze the silver-copper-bismuth alloy to produce cathode copper, metals such as gold, silver, bismuth and tellurium are enriched into the copper anode slime, and the copper anode slime is leached with dilute hydrochloric acid with a pH of 0.5, and the leaching solution ...
Embodiment 2
[0023] 18 tons of copper scum raw materials, its composition is: silver 0.5wt%, copper 20wt%, lead 45wt%, antimony 21wt%, bismuth 2.5wt%, tellurium 0.3wt%, gold 18g / T.
[0024] (1) Add copper scum into the smelting furnace, oxidize blowing at 700-1200°C, add sodiumcarbonate to remove antimony, add silicon to remove lead, most of the lead and antimony enter the soot 1 and oxide slag A, while gold, silver, copper, bismuth and tellurium Into the alloy, a silver-copper-bismuth alloy is formed, which is cast directly 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, bismuth, lead and antimony is 98%...
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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-bismuthalloy, smoke 1 and oxidizing slag A; electrolyzing the silver-copper-bismuthalloy 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-antimonyalloy, 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 antimonyoxide, 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 copperrecovery 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...
Claims
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