Comprehensive recovery method of rare metals in waste circuit boards

A technology for waste circuit boards and rare and precious metals, applied in the direction of improving process efficiency, etc., can solve the problems of strong corrosion of toxic aqua regia, etc., and achieve the effects of low environmental pollution, high metal recovery rate, and large profits

Active Publication Date: 2014-06-04
荆门格林循环电子废弃物处置有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a method for recovering rare and precious metals from waste circuit boards, the purpose of which is to overcome the problems that the existing process is prone to produce toxic substances in the recovery process and the strong corrosion of aqua regia has high requirements for equipment, and proposes a method A recovery method suitable for industrial production and having good environmental and economic benefits

Method used

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  • Comprehensive recovery method of rare metals in waste circuit boards

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A comprehensive recovery method for rare and precious metals in waste circuit boards, comprising the following steps:

[0035] Step (1): Roasting

[0036] The waste circuit boards are roughly broken and finely broken, and then electrostatically sorted to separate the metal components and non-metal components. The composition and content of the metals are as follows:

[0037] metal name

Cu

Ni

Pb

Zn

Fe

Al

PD

Sb

Content (%)

86.7

3.31

1.73

0.35

0.14

0.11

0.076

0.04

metal name

co

mn

Cr

Ca

Cd

Ag

Au

Content (%)

0.0001

0.01

0.0011

0.0001

0.0001

0.0001

0.0001

[0038] The metal was calcined at 200°C for 2h at low temperature.

[0039] Step (2): Ammonia immersion

[0040] The roasted metal components are leached in ammonia water at atmospheric pressure, and the two-stage countercur...

Embodiment 2

[0051] A comprehensive recovery method for rare and precious metals in waste circuit boards, comprising the following steps:

[0052] Step (1): Roasting

[0053] The waste circuit boards are roughly broken and then electrostatically sorted, and the metal components and non-metal components are sorted out. The composition and content of the metals are as follows:

[0054] metal name

Cu

Ni

Pb

Zn

Fe

Al

PD

Sb

Content (%)

86.7

3.31

1.73

0.35

0.14

0.11

0.076

0.04

metal name

co

mn

Cr

Ca

Cd

Ag

Au

Content (%)

0.0001

0.01

0.0011

0.0001

0.0001

0.0001

0.0001

[0055] The metal is fired at a low temperature of 250°C for 3 hours.

[0056] Step (2): Ammonia immersion

[0057] The roasted metal components are leached in ammonia water at atmospheric pressure, and the two-stage countercurrent lea...

Embodiment 3

[0070] A comprehensive recovery method for rare and precious metals in waste circuit boards, comprising the following steps:

[0071] Step (1): Roasting

[0072] The waste circuit boards are roughly broken and then electrostatically sorted, and the metal components and non-metal components are sorted out. The composition and content of the metals are as follows:

[0073] metal name

Cu

Ni

Pb

Zn

Fe

Al

PD

Sb

Content (%)

86.7

3.31

1.73

0.35

0.14

0.11

0.076

0.04

metal name

co

mn

Cr

Ca

Cd

Ag

Au

Content (%)

0.0001

0.01

0.0011

0.0001

0.0001

0.0001

0.0001

[0074] The metal is fired at a low temperature of 300°C for 5 hours.

[0075] Step (2): Ammonia immersion

[0076] The roasted metal components are leached in ammonia water at atmospheric pressure, and the two-stage countercurrent lea...

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PUM

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Abstract

The invention provides a comprehensive recovery method of rare metals in waste circuit boards. The method comprises crushing the waste circuit boards, sorting, calcining, immersing in an ammonia water, filtering to get a filter residue A which is dissolved by nitric acid to recover silver, lead, tin, antimony, etc., immersing a filter residue metal B insoluble in the nitric acid with a mixed solution of hydrochloric acid and sodium hypochlorite, filtering to get a filtrate C which is then introduced into SO2 so as to displace gold powder, and then obtaining platinum powder and palladium powder respectively by extracting and displacing. The method has advantages of high metal recovery rate, simple method, simple equipment, no environmental pollution and the like, maximizes recycling of valuable metal resources in the waste circuit boards, and has enormous social and economic benefits.

Description

Technical field [0001] The present invention relates to a method for processing electronic waste, and in particular, to a comprehensive recovery method of rare and precious metals in waste circuit boards. Background technique [0002] With the development of science and technology, the frequency of product updates has accelerated. As the key and most basic component of various electronic and electrical products, circuit boards have become one of the main sources of electronic waste. [0003] Waste circuit boards contain both many harmful substances and a large number of valuable substances. Usually, waste circuit boards contain 30% plastic, 30% inert oxide and 40% metal (by weight), of which base metals (copper, lead, zinc, etc.) account for about 30%, and precious metals (gold) , silver, platinum, palladium, etc.) accounting for about 0.3% to 0.4%. Therefore, recycling metals, especially precious metals, is the main driving force for recycling waste circuit boards. If no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/04C22B3/20C22B11/00C22B13/00C22B21/00C22B25/00C22B30/02
CPCY02P10/20
Inventor 王勤周继锋苏陶贵何显达李艳华陈艳红
Owner 荆门格林循环电子废弃物处置有限公司
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