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A method of extracting gold from waste circuit boards

A waste circuit board and extraction technology, which is applied in the direction of improving process efficiency, can solve the problems of high gold recovery cost and low recovery rate, and achieve the effect of fast leaching time, low cost and high gold leaching rate

Active Publication Date: 2020-11-03
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for extracting gold from waste circuit boards, thereby overcoming the disadvantages of high gold recovery cost and low recovery rate

Method used

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  • A method of extracting gold from waste circuit boards

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Effect test

Embodiment 1

[0026] A method for extracting gold from waste circuit boards, the process flow chart is as follows figure 1 As shown, five parts including physical pretreatment, chemical pretreatment, immersion in aqua regia, gold extraction by DBC-isopropanol extraction system and reduction of gold by sodium sulfite, specifically include the following steps:

[0027] (1) Physical pretreatment: 11 waste mobile phones purchased from the market were manually disassembled to obtain waste circuit boards, and the mobile phone circuit boards were crushed into powder by using a high-speed multifunctional pulverizer. Screen with a 35-mesh national unified standard inspection sieve, and obtain 200 g of a powder sample with a particle size of less than 0.500 mm after screening, which is the gold-containing material powder.

[0028] (2) Chemical pretreatment: Put 1.0000g of gold-containing material powder in a small beaker, add excess HNO 3 The solution was placed in a digital display constant tempera...

Embodiment 2

[0034] A method for extracting gold from waste circuit boards, the process flow chart is as follows figure 1 As shown, five parts including physical pretreatment, chemical pretreatment, immersion in aqua regia, gold extraction by DBC-isopropanol extraction system and reduction of gold by sodium sulfite, specifically include the following steps:

[0035] (1) Physical pretreatment: 11 waste mobile phones purchased from the market were manually disassembled to obtain waste circuit boards, and the mobile phone circuit boards were crushed into powder by using a high-speed multifunctional pulverizer. Screen with a 35-mesh national unified standard inspection sieve, and obtain 200 g of a powder sample with a particle size of less than 0.500 mm after screening, which is the gold-containing material powder.

[0036] (2) Chemical pretreatment: Put 1.0000g of gold-containing material powder in a small beaker, add excess HNO 3 The solution was placed in a digital display constant tempera...

Embodiment 3

[0042] A method for extracting gold from waste circuit boards, the process flow chart is as follows figure 1 As shown, five parts including physical pretreatment, chemical pretreatment, immersion in aqua regia, gold extraction by DBC-isopropanol extraction system and reduction of gold by sodium sulfite, specifically include the following steps:

[0043](1) Physical pretreatment: 11 waste mobile phones purchased from the market were manually disassembled to obtain waste circuit boards, and the mobile phone circuit boards were crushed into powder by using a high-speed multifunctional pulverizer. Screen with a 35-mesh national unified standard inspection sieve, and obtain 200 g of a powder sample with a particle size of less than 0.500 mm after screening, which is the gold-containing material powder.

[0044] (2) Chemical pretreatment: Put 1.0000g of gold-containing material powder in a small beaker, add excess HNO 3 The solution was placed in a digital display constant temperat...

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Abstract

The invention discloses a method for extracting gold from waste circuit boards, which comprises the following steps: (1) crushing waste circuit boards and passing through a sieve to obtain gold-containing powder; (2) treating the gold-containing powder with nitric acid Perform pretreatment to obtain gold-containing filter residue; (3) add gold-containing filter residue to aqua regia for digestion to obtain gold-containing aqua regia; (4) mix and extract gold-containing aqua regia and extract, and perform at least two extractions; The extract of the DBC-isopropanol system is used to extract gold, the gold-containing organic phase is obtained after the first extraction and liquid separation, the raffinate is separated, and the extract with the same volume as the raffinate is added to fully mix for the second extraction; Wherein, the DBC-isopropanol system includes by volume percentage: 60-80% DBC and 20-40% isopropanol, extracted at normal temperature; (5) adding sodium sulfite to the gold-containing organic phase for reduction to obtain sponge gold . The gold extraction method of the invention has a secondary extraction rate of 96%, an extraction reduction rate of 95%, a cost reduction of 20%, and obvious economic benefits.

Description

technical field [0001] The invention relates to the field of gold extraction, in particular to a method for extracting gold from waste circuit boards. Background technique [0002] It is understood that waste mobile phone parts contain lead, cadmium, mercury and other harmful substances. If they are discarded directly, they will seriously pollute the soil and groundwater. If the used mobile phones are transported to the garbage dump for incineration, the plastic casing will also produce toxic substances containing chlorine, and even the first-class carcinogen "dioxin". The circuit boards and shells of mobile phones contain brominated flame retardants, which can damage human health, cause thyroid dysfunction, endocrine disorders, and nervous and immune system problems. The internal parts contain a variety of valuable materials, including 0.01% gold, 20% to 25% copper, and 40% to 50% renewable plastics. The key to recovery of gold from gold-bearing waste is to try to separat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/26C22B11/00C22B3/06C22B7/00
CPCC22B3/06C22B11/046C22B3/262Y02P10/20
Inventor 黄魁黄朝冉董海丽蒋中伟陈继文
Owner GUANGXI UNIV
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