Heavy non-ferrous metal smelting process by-product in the recovery of gold. Gold can be recovered heavy non-ferrous smelting byproducts anode slime is primarily copper, silver, antimony smelting output, pyrite cinder, wet copper slag, dross and the like.
The anode slime produced by copper electrolysis generally contains 0.5% to 5% of gold and 5% to 30% of silver. The value of gold and silver is equivalent to or higher than that of electrolytic copper. It is treated by copper anode mud and gold. Gold, silver. Silver electrolytic anode mud contains gold content of up to 20% to 70%, containing 40% to 70% of silver, and gold is recovered by gold anode mud treatment. The pyrite cinder contains gold in the range of 0.5~2g/t, and the amount of slag is huge. It is an important resource for recovering gold. The gold is recovered by gold extraction from pyrite cinder. The anode slime obtained from the electrolysis of gold-bearing concentrate contains 3%~12% of gold, and the gold value is higher than other components in the anode slime, and the gold is recovered by gold extraction from the anode anode. The zinc slag includes zinc sulphate slag, hematite slag, goethite slag, slag from pyrometallurgical slag, flat slag and kiln slag. The zinc slag contains gold of 2.5 to 4 g/t and silver of 400 to 600 g/t, and gold is recovered by gold extraction from zinc slag.
The gold in the wet copper slag is in the form of free gold and silver gold, and the gold grade can reach 7-8 kg/1000t. China produces more than 10,000 tons of wet copper slag per year, and uses cyanidation or flotation to treat the recovered gold. The cyanidation method firstly adjusts the slurry with dilute sulfuric acid to pH 1.5 to 2.0, and leaches for 2 hours at 363 K, so that most of the copper is dissolved into the leachate, the gold remains in the leach residue, and then the leach residue is recovered by cyanidation. In the gold. The solid-liquid ratio of cyanidation is 1:2, and 10 kg of NaCN, 0.30-0.5 kg of CaO, and 2 kg of lead acetate per ton of slag, and air leaching for 48 h at room temperature, the gold recovery rate is 90%, and the silver is 65%. The flotation method is basically the same as the gold ore gold extraction and the pyrite slag gold extraction process, and can extract 70% to 80% of gold.
Zinc, copper concentrate, pyrite cinder produced by high-temperature chlorination, gold content of 500g / t, silver 900g / t, with NaCl containing 200 ~ 300g / L solution, the ratio of solid to liquid 1:3, Leaching at 333 K for 2 h, 86% of gold chloride and silver chloride were recovered into the solution.
Gold extracted from metallurgical by-products accounts for 5% to 10% of the world's total gold production. China has incorporated low-grade gold concentrate into heavy ferrous metal smelting, so the amount of gold extracted from metallurgical by-products is relatively large, reaching about half of the total gold production in the country.
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