Method for removing lead, antimony, bismuth, selenium, tellurium and arsenic from copper anode slime by vacuum reduction

Abstract

The invention relates to the technical field of metal smelting, and discloses a method for removing lead, antimony, bismuth, selenium, tellurium and arsenic from copper anode slime by vacuum reduction. The method comprises the steps: S1, after drying and dispersing the copper anode slime, uniformly mixing the copper anode slime with a solid reducer; in a vacuum furnace, electrically heating to reduce and distill out lead, antimony, bismuth, selenium, tellurium and arsenic vaporized materials, and thus leaving over residues containing gold, silver and copper; S2, introducing smoke dust into a multistage condenser group, controlling the temperature gradient of the multistage condenser group, thus condensing lead, antimony, bismuth, selenium, tellurium and arsenic in the smoke dust in different condensers, and respectively obtaining lead, antimony, bismuth, selenium, tellurium and arsenic. The method adopts vacuum distillation and fractional condensation for the copper anode slime to separate lead, antimony, bismuth, selenium, tellurium and arsenic, therefore the removal rate is high, and the purity of recovered materials is high. Moreover, the process is simple, no sulfur dioxide is discharged, and the environment is not polluted..

Description

technical field [0001] The invention relates to the technical field of metal smelting, and more specifically relates to a method for vacuum reduction and deleading of antimony, bismuth, selenium, tellurium and arsenic of copper anode slime. Background technique [0002] Copper anode slime is the muddy fine-grained substance that falls on the bottom of the electrolytic tank during electrolytic refining of copper, and is mainly composed of impurities insoluble in the electrolyte in the anode crude metal and the metal to be refined. It is generally gray, and the particle size is about 100-200 mesh. Among them, each component mostly exists in the form of precious and valuable metals, sulfides, selenium tellurium compounds, oxides, elemental sulfur and basic salts, which can be recovered as gold, silver, lead, antimony, bismuth, selenium, tellurium, Raw materials such as arsenic. For example, anode slime from electrolytic refining of copper can recover copper and extract gold, ...

AI Technical Summary

Problems solved by technology

The process steps of this patent are numerous and complicated, and it needs to go through sulfation and side-blown furnace smelting. The process of recovering metal from the resulting Dorr alloy is complicated, the cycle of subsequent treatment of slag is long, and the utilization rate of equipment is low.

Moreover, the concentrated sulfuric acid decopper and selenium removal method is used. After mixing with excess concentrated sulfuric acid and copper anode slime, it is oxidized and decomposed in the sulfation roasting rotary kiln. The sulfation decomposition produces a large amount of sulfur dioxide waste gas, which causes great environmental pollution.

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