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Method for extracting gold by using circuit board anode mud

An anode slime and circuit board technology, which is applied in the direction of improving process efficiency, can solve the problems of poor popularization, large area and high cost, and achieve the effects of protecting resources, high recovery rate and improving economic benefits.

Inactive Publication Date: 2010-06-30
广东奥美特集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other processing methods are generally foreign research and development technologies, which are expensive, occupy a large area, are not suitable for my country's national conditions, and have poor promotion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The method for extracting gold from the anode mud of the circuit board in this embodiment has the following steps:

[0016] (1), based on the weight of the anode slime, add 15% sulfuric acid H in the anode slime 2 SO 4 , 10% sodium chloride NaCl, 2% sodium chlorate NaClO 3 , filtered to obtain immersion liquid and leaching residue; the obtained immersion liquid is cooled, crystals are precipitated and copper is recovered;

[0017] (2), step (1) gained leaching residue, by leaching residue weight, add 10% sodium bromide NaBr, 5% hydrogen chloride HCl, 5% sodium hypochlorite NaCIO, 2% sodium chloride NaCl, filter to obtain gold-containing leaching solution, Silver leaching residue;

[0018] (3), step (2) gained silver-containing leaching slag, by weight of silver leaching slag, add 20% ammoniacal liquor NH 3 .H 2 O, filter to obtain silver-containing leaching liquid and leaching residue; add 8% hydrazine hydrate NH to silver-containing leaching liquid 2 NH 2 .H 2 ...

Embodiment 2

[0023] The method for extracting gold from the anode mud of the circuit board in this embodiment has the following steps:

[0024] (1), based on the weight of the anode slime, add 20% sulfuric acid H to the anode slime 2 SO 4 , 15% sodium chloride NaCl, 5% sodium chlorate NaClO 3 , filtered to obtain immersion liquid and leaching residue; the obtained immersion liquid is cooled, crystals are precipitated and copper is recovered;

[0025] (2), step (1) gained leaching residue, by leaching residue weight, add 20% sodium bromide NaBr, 10% hydrogen chloride HCl, 10% sodium hypochlorite NaCIO, 5% sodium chloride NaCl, filter to obtain gold-containing leaching solution, Silver leaching residue;

[0026] (3), step (2) gained silver-containing leaching slag, by silver leaching slag weight, add 30% ammoniacal liquor NH 3 .H 2 O, filter to obtain silver-containing leaching liquid and leaching residue; add 10% hydrazine hydrate NH to silver-containing leaching liquid 2 NH 2 .H 2 ...

Embodiment 3

[0031] The method for extracting gold from the anode mud of the circuit board in this embodiment has the following steps:

[0032] (1), based on the weight of the anode slime, add 18% sulfuric acid H in the anode slime 2 SO 4 , 13% sodium chloride NaCl, 3% sodium chlorate NaClO 3 , filtered to obtain immersion liquid and leaching residue; the obtained immersion liquid is cooled, crystals are precipitated and copper is recovered;

[0033] (2), step (1) gained leaching residue, by leaching residue weight, add 15% sodium bromide NaBr, 7% hydrogen chloride HCl, 7% sodium hypochlorite NaCIO, 4% sodium chloride NaCl, filter to obtain gold-containing leaching solution, Silver leaching residue;

[0034] (3), step (2) gained silver-containing leaching slag, by silver leaching slag weight, add 25% ammoniacal liquor NH 3 .H 2 O, filter to obtain silver-containing leaching liquid and leaching residue; add 9% hydrazine hydrate NH to silver-containing leaching liquid 2 NH 2 .H 2 O i...

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Abstract

The invention relates to a method for extracting gold by using circuit board anode mud. The method comprises the following steps that: sulfuric acid, sodium chloride and sodium chlorate are added in anode mud, and leached liquid and leached residue are obtained through filtration; the leached liquid is cooled, crystals are precipitated and copper is recovered; sodium bromide, hydrogen chloride, sodium hypochlorite and sodium chloride are added in the obtained leached residue, and leached liquid containing gold and leached residue containing silver are obtained through filtration; ammonia water is added in the leached residue containing silver, and leached liquid containing silver and leached residue are obtained through filtration; hydrazine hydrate is added to reduce the leached liquid containing silver and silver powder is obtained; and sodium sulfite is added to reduce the obtained leached liquid containing gold, then hydrogen nitrate and sodium hydroxide are added and finally goldpowder is obtained. The invention solves the difficulty in China that precious metals are hard to be separated from the anode mud after cathode copper is extracted from waste circuit boards through miscellaneous copper alloy electrolysis, and has the advantages that the recovery rate of the precious metals is improved, the resources are protected and the economic benefit is improved.

Description

technical field [0001] The invention relates to a method for extracting gold from circuit board anode mud. Background technique [0002] Since the research and development of circuit board treatment technology, for the separation and purification of metals in circuit boards after crushing, there are mainly treatment methods such as wet method, incineration method and biological method. The wet method uses a strong oxidizing acid to treat the waste printed circuit board, oxidizes the metal contained in it into ions and enters the solution; then utilizes the difference in the reducibility of various metal ions from the solution to recover the metal by replacement or electrolytic treatment process . This treatment method uses acid as an oxidant, which will produce a large amount of NO gas during the treatment process and pollute the environment. After the precious metals are recovered, the solution contains a large amount of metal ions, and the subsequent treatment investment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/06C22B11/00
CPCY02P10/20
Inventor 林春涛
Owner 广东奥美特集团有限公司
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