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A method for recovering gold and silver in gold-silver-copper alloy waste

A copper alloy and scrap technology, which is applied to the improvement of process efficiency, instruments, optics, etc., can solve the problems of shortening the recovery process and difficulty in dissolving gold, silver and copper alloy waste, so as to shorten the recovery process, speed up the dissolution rate and achieve good separation effect Effect

Active Publication Date: 2020-08-18
西安诺博尔稀贵金属材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a gold-silver-copper alloy waste recovery process that can solve the problem of difficult dissolution of gold-silver-copper alloy waste and shorten the recovery process of gold-silver-copper alloy waste Gold and Silver Methods

Method used

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  • A method for recovering gold and silver in gold-silver-copper alloy waste

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Effect test

Embodiment 1

[0033] The mass content of gold in the gold-silver-copper alloy scrap of this embodiment is 60%, the mass content of silver is 35%, and the balance is copper and other unavoidable impurities, and the method for reclaiming gold and silver in the gold-silver-copper alloy scrap includes The following steps:

[0034] Step 1. Put the gold, silver and copper alloy scraps in an ultrasonic reaction kettle whose liner is made of titanium, then add concentrated nitric acid with a mass percentage concentration of 68% into the ultrasonic reaction kettle, and ultrasonically leach at 65°C for 6 hours under stirring conditions After filtration, the filtrate and filter residue are obtained, and the ultrasonic frequency is 80KHz; the filter residue is coarse gold powder with a particle size of 50 μm to 100 μm;

[0035] Step 2, diluting the filtrate described in step 1 to a silver content of 5mg / L with deionized water, then adopting pretreated sulfonic acid group strong acidic cation exchange r...

Embodiment 2

[0044] The mass content of gold in the gold-silver-copper alloy scrap of this embodiment is 70%, the mass content of silver is 20%, and the balance is copper and other unavoidable impurities. The method for reclaiming gold and silver in the gold-silver-copper alloy scrap includes The following steps:

[0045] Step 1. Put the gold, silver and copper alloy scraps in an ultrasonic reaction kettle whose liner is made of titanium, then add concentrated nitric acid with a concentration of 65% by mass into the ultrasonic reaction kettle, and ultrasonically leach at 78°C for 5 hours under agitation. After filtration, the filtrate and filter residue are obtained, and the ultrasonic frequency is 100KHz; the filter residue is coarse gold powder with a particle size of 50 μm to 100 μm;

[0046] Step 2, diluting the filtrate described in step 1 to a silver content of 8 mg / L with deionized water, then adopting pretreated sulfonic acid group strong acidic cation exchange resin to carry out i...

Embodiment 3

[0055] The mass content of gold in the gold-silver-copper alloy scrap of this embodiment is 50%, the mass content of silver is 20%, and the balance is copper and other unavoidable impurities. The method for reclaiming gold and silver in the gold-silver-copper alloy scrap includes The following steps:

[0056] Step 1. Put the gold, silver and copper alloy scraps in an ultrasonic reaction kettle whose liner is made of titanium, then add concentrated nitric acid with a concentration of 65% by mass into the ultrasonic reaction kettle, and ultrasonically leach at 80°C for 4 hours under agitation. After filtration, the filtrate and filter residue are obtained, and the ultrasonic frequency is 110KHz; the filter residue is coarse gold powder with a particle size of 50 μm to 100 μm;

[0057] Step 2, diluting the filtrate described in step 1 to a silver content of 10 mg / L with deionized water, then adopting pretreated sulfonic acid group strong acidic cation exchange resin to carry out ...

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Abstract

The invention relates to a method for recovering gold and silver in a gold, silver and copper alloy scrap. The method comprises the following steps of firstly, placing the gold, silver and copper alloy scrap in an ultrasonic reactor, adding concentrated nitric acid to the ultrasonic reactor, and after ultrasonic leaching filtration, obtaining a filtrate and a filter residue; secondly, using an ionexchange separation method for ion exchange separation to obtain a silver nitrate solution; thirdly, using an electrowinning method to recover silver in a silver nitrate solution; fourthly, dissolving the filter residue in aqua regia, diluting after the nitrate removal, adjusting the pH with sodium hydroxide, adding sodium bisulfite until no precipitation produces, boiling, reacting until a solution supernatant become colorless, filtering, washing the precipitate with deionized water to neutral, drying, and obtaining a sponge gold. The method not only solves the problem that the gold, silverand copper alloy scrap is difficult to dissolve, but also shortens the recovery process of the gold, silver and copper alloy scrap, and the recovered gold and silver can be directly used for the preparation of gold, silver and copper alloy materials.

Description

technical field [0001] The invention belongs to the technical field of alloy scrap recycling, and in particular relates to a method for recycling gold and silver in gold-silver-copper alloy scrap. Background technique [0002] Gold, silver and copper alloys are mainly used in precision instruments as potentiometer windings, brushes and light-load contact materials, as well as vacuum solder, spring materials and other fields. In the production process of gold, silver and copper materials, a large amount of alloy waste will be generated during the smelting and processing of alloys. Among them, gold and silver have high recovery value and need to be recovered, purified and recycled. [0003] At present, there is no relevant process report on recycling precious metal gold and silver with gold-silver-copper alloy scrap as raw material. The traditional recycling method of gold and silver waste is: if gold:silver>3:1, it can be dissolved in aqua regia, and the gold will be tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B11/00C25C1/20
CPCC22B7/007C22B11/042C25C1/20Y02P10/20
Inventor 王涵睿史智锋贺慧马李思思马晓东于妍赵涛孟志军吴永强董蔚蔡兴顺李海军
Owner 西安诺博尔稀贵金属材料股份有限公司
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