Method for step-by-step extraction of copper anode mud silver separating residues

A copper anode slime and silver slag separation technology, applied in the step-by-step extraction of Sn, copper anode slime silver slag, Ag, Ba, comprehensive recovery of Au, Pb in copper anode slime silver slag, can solve the comprehensive problem of lead, tin and barium Low utilization, low recovery rate of gold and silver, high metal value, etc., to achieve the effect of reducing reagent consumption, mild process conditions, and high-efficiency separation

Active Publication Date: 2017-07-21
北矿力澜科技咨询(北京)有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problems of high value of metals such as Au, Ag, Pb, Sn, Ba in the silver slag of copper anode slime, low recovery rate of gold and silver, and low degree of comprehensive utilization of lead, tin and barium, the present invention develops a silver slag separator for copper anode slime. One-step extraction method, separation of gold, silver, and lead through chlorination system, carbonic acid conversion-hydrochloric acid leaching to separate barium, effectively realize the separation of lead, barium, gold, silver and the efficient enrichment of tin, and successfully realize the Au in the silver separation slag Green and efficient recovery of metals such as , Ag, Pb, Sn, Ba, etc.

Method used

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  • Method for step-by-step extraction of copper anode mud silver separating residues

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Experimental program
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Effect test

Embodiment 1

[0031] The silver slag of copper anode slime is leached with 20g / L HCl+300g / L NaCl solution, the leaching liquid-solid ratio is 5:1, the leaching time is 3h, the leaching temperature is 95°C, NaClO is added as the oxidant during leaching, and the leaching rate of lead, gold and silver 98%, 99%, and 99%, respectively. Lead leachate and lead slag are obtained by filtration; the leachate is replaced by lead powder for gold and silver, and iron powder for lead to obtain gold and silver concentrate and sponge lead respectively. After the replacement, the liquid is neutralized with CaO In addition to SO 4 2- , Fe 2+ , the neutralization temperature is 90°C, the neutralization time is 4 hours, the end point is pH4.0, oxygen is added as the oxidant during neutralization, the neutralization slag is piled up, and Fe in the liquid after neutralization 总 4 2- <50mg / L, return to leaching of silver slag.

[0032] Use 400g / LNa after washing the lead slag 2 CO 3 Secondary leaching of th...

Embodiment 2

[0034] Use 50g / L HCl+350g / L KCl solution to leach the silver slag from copper anode slime, the leaching liquid-solid ratio is 6:1, the leaching time is 3h, the leaching temperature is 95°C, and NaClO is added during leaching 3 As an oxidizing agent, the leaching rates of lead, gold, and silver are 98%, 99%, and 99% respectively, and lead leachate and lead slag are obtained by filtration; gold and silver concentrates, Sponge lead, after replacement, use CaO+NaOH to neutralize and remove SO 4 2- , Fe 2+ , neutralization temperature 90°C, neutralization time 3h, end point pH 4.0, hydrogen peroxide is added as oxidant during neutralization, neutralization slag is piled up, Fe in the liquid after neutralization 总 4 2- <50mg / L, return to leaching of silver slag.

[0035] Use 380g / LNa after washing the lead slag 2 CO 3 Secondary leaching of the solution, liquid-solid ratio 5:1, leaching temperature 90°C, leaching time 4h, filtering to obtain leaching solution and barium convers...

Embodiment 3

[0037] Use 50g / L HCl+300g / L NaCl solution to leach the silver slag from copper anode slime, the leaching liquid-solid ratio is 4:1, the leaching time is 2h, the leaching temperature is 90°C, and Cl is added during leaching 2 As an oxidizing agent, the leaching rates of lead, gold, and silver are 98%, 99%, and 99% respectively, and lead leachate and lead slag are obtained by filtration; gold and silver concentrates, Sponge lead, the solution after replacement is neutralized with CaO to remove SO 4 2- , Fe 2+ , neutralization temperature 85°C, neutralization time 4h, end point pH 4.5, add NaClO during neutralization 3 As an oxidant, the neutralized slag is piled up, and Fe in the liquid after neutralization 总 4 2- <50mg / L, return to leaching of silver slag.

[0038] Use 350g / LNa after washing the lead slag 2 CO 3 +30g / LNa 2 SO 4 Secondary leaching of the solution, liquid-solid ratio 4:1, leaching temperature 90°C, leaching time 4h, filtering to obtain leaching solution ...

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Abstract

The invention discloses a method for step-by-step extraction of copper anode mud silver separating residues and belongs to the technical field of copper smelting comprehensive recovery. By means of the method, chlorine salt is used for separating gold, silver and lead, barium is separated through carbonic acid conversion-hydrochloric acid leaching, and separation of lead, barium, gold and silver and efficient concentration of tin are effectively achieved; and environment-friendly and efficient recovery of metal such as Au, Ag, Pb, Sn and Ba in the silver separating residues is successfully achieved. Meanwhile, effective solution system circulation of chlorination solution circulation, carbonic acid solution circulation and HCl regeneration circulation is developed for a lead and barium separation system, and consumption of a reagent is greatly reduced. By means of the method, technology conditions are moderate, high temperatures, high acid and strong base are not needed, and the large-scale industry is better achieved; due to self circulation of different solution systems, outward draining of waste water is avoided, all components in the silver separating residues are recycled, solid waste is prevented from being generated, and environment friendliness is achieved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive recovery of copper smelting, and relates to a step-by-step extraction method for separating silver slag from copper anode slime, in particular to a method for comprehensively recovering Au, Ag, Pb, Ba and Sn from silver slag separating copper anode slime. Background technique [0002] Copper anode slime is an insoluble sludge attached to the surface of the residual anode or deposited on the bottom of the electrolytic tank during the copper electrolytic refining process. It is composed of elements with higher potential than copper and various substances insoluble in the electrolyte. Its composition mainly depends on The composition of the copper anode, the yield is generally 0.2-0.8%; the silver-separating slag is the residue after extracting precious metals such as gold, silver, platinum, palladium and copper, selenium, tellurium and other valuable elements from the copper anode slime. In re...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B13/00C22B11/00C22B26/20C22B25/06
CPCC22B7/006C22B11/044C22B13/045C22B25/06C22B26/20Y02P10/20
Inventor 李岚
Owner 北矿力澜科技咨询(北京)有限公司
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