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Regenerating method and process for recycling rare precious metals from electronic wastes

A technology of electronic waste and rare and precious metals, which is applied in the field of resource regeneration and recycling, can solve problems such as threats to human health, groundwater hazards, and environmental pollution, and achieve significant social benefits, low cost, and high efficiency.

Active Publication Date: 2013-11-20
HUNAN TONGLI ELECTRONICS WASTE RECOVERING DISSEMBLING & UTILIZATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, it also contains some heavy metals such as Pb, Cd, etc., directly discarding it will cause a great waste of resources
However, if it is piled up or landfilled, the heavy metals contained in it will be leached, causing potential harm to groundwater.
If it is burned, the flame retardant containing halogen elements on the circuit board will produce carcinogens, which seriously threaten human health and pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) After manual removal of electronic components from waste circuit boards, 10 kg of fine powder that 50% can pass through a 200-mesh sieve is obtained by crushing and crushing, and 20 kg of tributyl phosphate solvent is added to it, and heated to 85°C for 3 hours. The solvent is separated by heat, the solvent is recycled, and the powder is processed in the next step.

[0028] 2) Wash the powder with clean water, dry it, and then use a high-voltage electrostatic separator to separate metal and non-metal.

[0029] 3) Weigh the metal powder, which is 7.5 kg, and use a 1800 Gauss weak magnetic separator to perform dry selection once to select iron powder (1.2 kg).

[0030] 4) Put the remaining 6.3 kg of metal powder in a PP plastic bucket, add 20 kg of 20% dilute sulfuric acid, 3 kg of hydrogen peroxide, and start stirring. Leach at room temperature for 2 hours and filter. The filter residue is processed in the next step, and the filtrate is a copper-containing solution....

Embodiment 2

[0035]1) After the waste circuit board is manually removed from the electronic components, 15 kg of fine powder that 80% can pass through a 180-mesh sieve is obtained by crushing and crushing, and 32 kg of dimethyl sulfoxide solvent is added to it, and heated to 95 ° C for 4 hours. The solvent is separated while hot, and the solvent is recycled.

[0036] 2) Wash the powder with clean water, dry it, and then use a high-voltage electrostatic separator to separate metal and non-metal.

[0037] 3) Weigh the metal powder, which is 12.5 kg, and use a 1500 Gauss weak magnetic separator to dry select once to select iron powder (2.1 kg).

[0038] 4) Put the remaining 8.5 kg of metal powder in a PP plastic bucket, add 25 kg of 20% dilute sulfuric acid, 4 kg of hydrogen peroxide, and start stirring. Leach at room temperature for 3 hours and filter. The filter residue is processed in the next step, and the filtrate is a copper-containing solution.

[0039] 5) Copper is recovered from t...

Embodiment 3

[0043] 1) After the waste circuit board is manually removed from the electronic components, 20 kg of fine powder that 80% can pass through a 200-mesh sieve is obtained by crushing and crushing, and 45 kg of N-methylpyrrolidone solvent is added to it, and heated to 93 ° C for 4 hours , The solvent is separated while it is hot, and the solvent is recycled.

[0044] 2) Wash the powder with clean water, dry it, and then use a high-voltage electrostatic separator to separate metal and non-metal.

[0045] 3) Weigh the metal powder, which is 13.5 kg, and use a 1200 Gauss weak magnetic separator to dry select once to select iron powder (3.5 kg).

[0046] 4) Put the remaining 9.5 kg of metal powder in a PP plastic bucket, add 40 kg of 20% dilute sulfuric acid, 5 kg of hydrogen peroxide, and start stirring. Leach at room temperature for 3 hours and filter. The filter residue is processed in the next step, and the filtrate is a copper-containing solution.

[0047] 5) Copper is recover...

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PUM

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Abstract

The invention discloses a regenerating method and process for recycling rare precious metals from electronic and electric wastes, and particularly discloses a process for recycling non-ferrous and rare precious metals such as copper, tin, gold, silver, platinum, palladium, rhodium and the like from electronic wastes. The regenerating method comprises the following steps of: smashing circuit boards and elements dismounted from waste electronic and electric appliances such as waste computers, waste mobile phones, waste televisions and the like to 40-200 meshes; dissolving a binder by using an organic solvent; then, separating metals and nonmetals by using a high voltage electrostatic method; next, leaching the precious metals by using sulfuric acid and aqua regia; extracting silver, gold, platinum, palladium and rhodium step by step by using a liquid membrane; and finally, carrying out purification treatment to obtain nonferrous metals such as copper and tin and the rare precious metals such as gold, silver, platinum, palladium, rhodium and the like, so that the waste secondary resource is regenerated and recycled. The regenerating method has the advantages of simplicity and convenience in process, high comprehensive metal recycle ratio, few three wastes, easiness for treatment and low cost, is a favorable technical approach for efficient utilization of mineral resources of cities, and not only has an environment-friendly benefit, but also has favorable economic and social benefits.

Description

technical field [0001] The invention relates to the field of resource regeneration and recycling, in particular to a recycling method and process for comprehensively recycling copper and rare and precious metals from electronic and electrical waste. Background technique [0002] Electronic and electrical waste contains valuable metals, which can be recycled as secondary resources. For example, the core of mobile phones contains valuable metals such as copper, gold, silver and palladium, and the content is about Au (280g / t), Ag (2000g / t) t), Cu (100kg / t), Pd (100g / t). Such high-grade precious metal resources are rare among the precious metal deposits that have been mined in the world. Generally, even if the gold content of gold ore is as low as 3g / t, it is considered to be a gold mine with great mining value. Generally, the gold content of gold concentrate after beneficiation is only about 709R. The average grade of platinum group metal deposits in the world is only 0.6-239...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00C22B15/00C22B3/06C22B3/26B03C1/02
CPCY02P10/20
Inventor 肖国光邓曙新唐浩
Owner HUNAN TONGLI ELECTRONICS WASTE RECOVERING DISSEMBLING & UTILIZATION
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