Recovery method for valuable metals in copper anode slime

A recovery method, copper anode slime technology, applied to the improvement of process efficiency, instruments, optics, etc., can solve the problems of large dispersion of silver and gold in flotation tailings, high content of valuable metals, complicated treatment process, etc., and achieve base metal Low content, reduce the amount of slag output, and ensure the effect of removal efficiency

Active Publication Date: 2021-12-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This combined process can effectively improve the process efficiency, but the treatment process is complicated and the efficiency is low, especially the flotation tailings have large dispersion of silver and gold and high content of valuable metals, making it difficult to further process

Method used

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  • Recovery method for valuable metals in copper anode slime
  • Recovery method for valuable metals in copper anode slime
  • Recovery method for valuable metals in copper anode slime

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Sieve 2500kg copper anode slime with main composition as Pb 6.18%, Sb 4.2%, As 5.82%, Bi 7.28%, Cu 14.18%, Ag 10.65%, Se 4.03%, Te 1.02%, Ni 6.16% and Au 529.5g / t After removing large particle inclusions, the copper anode slime and concentrated sulfuric acid (98%) are slurried in the stirring tank at a mass ratio of 1:1, and the slurried anode slime is sent to the rotary kiln. The temperature at the head is 300°C, the temperature in the kiln is 500°C, and the temperature at the end of the kiln is 600°C. Sulphate roasting is carried out at a temperature of 500°C for 4 hours to obtain SeO-containing 2 Soot and calcine, containing SeO 2 Soot is absorbed by water into H 2 SeO 3 solution, by the SO in the soot 2 The gas is reduced to elemental selenium, and the crude selenium (purity is 89%) is obtained after drying;

[0078] Immerse the calcined sand in dilute sulfuric acid (acidity 100g / L), carry out oxygen pressure acid leaching (temperature 120°C, leaching time 30min...

Embodiment 2

[0094] Sieve 2500kg copper anode slime with main composition as Pb 6.18%, Sb 4.2%, As 5.82%, Bi 7.28%, Cu 14.18%, Ag 10.65%, Se 4.03%, Te 1.02%, Ni 6.16% and Au 529.5g / t After removing large particle inclusions, the copper anode slime and concentrated sulfuric acid (98%) are slurried in the stirring tank at a mass ratio of 1:1, and the slurried anode slime is sent to the rotary kiln. The temperature at the head is 300°C, the temperature in the kiln is 500°C, and the temperature at the end of the kiln is 600°C. Sulphate roasting is carried out at a temperature of 500°C for 4 hours to obtain SeO-containing 2 Soot and calcine, containing SeO 2 Soot is absorbed by water into H 2 SeO 3 solution, by the SO in the soot 2 The gas is reduced to elemental selenium, and the crude selenium (purity is 90%) is obtained after drying;

[0095] Immerse the calcined sand in dilute sulfuric acid (acidity 100g / L), carry out oxygen pressure acid leaching (temperature 120°C, leaching time 30min...

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Abstract

The invention provides a recovery method for valuable metals in copper anode slime, and belongs to the technical field of comprehensive treatment of the copper anode slime. According to the recovery method, selenium, copper, tellurium, arsenic, lead, bismuth and precious metal gold and silver in the copper anode slime are efficiently recovered, a two-step vacuum carbon thermal reduction method is adopted to replace anode slime reduction smelting and precious lead step-by-step blowing in a traditional pyrogenic process, and emission of arsenic-containing smoke dust in a traditional process is avoided. Gold-rich residues obtained through the recovery method hardly contain base metal lead, the bismuth, the antimony, the arsenic and the like, gold powder can be obtained after chlorination gold separation and reduction, compared with the traditional process, the content of base metals is lower, the output slag amount is greatly reduced, the production period is greatly shortened, and the loss of precious metals in the slag is reduced. According to the whole recovery method, the recovery period of the precious metals is shortened, the direct recovery rate of the valuable metals is increased, the vacuum carbon thermal reduction process is a closed system, the whole process avoids smoke emission, the working environment is improved, meanwhile, the arsenic recovery and emission problem is solved, and the process is simple and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of comprehensive treatment of copper anode slime, in particular to a method for recovering valuable metals in copper anode slime. Background technique [0002] Copper anode slime is the gray-black muddy substance that adheres to the surface of the residual anode or precipitates at the bottom of the electrolytic tank due to insoluble impurity metals with high reduction potential, such as bismuth, silver, antimony, and copper, during the electrolytic refining process of crude copper. The diameter is about 200 mesh, and the mass is generally about 0.2-1.0% of the anode plate. Barium sulfate is introduced into the anode slime as a cathode plate release agent, and most of the barium sulfate will be enriched into the copper anode slime during the copper electrolysis process. Copper anode slime contains a large amount of gold, silver, copper, lead, bismuth, selenium, tellurium and platinum group precious metals, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/06C22B9/02C22B13/02C22B15/00C22B30/04C22B30/06C25C1/20C01B19/02
CPCC22B7/002C22B1/06C22B7/007C22B7/001C22B9/02C25C1/20C22B15/0071C22B15/0089C01B19/02C22B30/04C22B13/025C22B13/045C22B30/06C01P2006/80Y02P10/20
Inventor 杨斌徐宝强邓聚海蒋文龙刘大春田阳李一夫孔令鑫杨佳
Owner KUNMING UNIV OF SCI & TECH
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