Method for recovering precious metal from electronic waste

A technology of electronic waste and precious metals, applied in the field of recycling precious metals, can solve the problems of low production efficiency, high product cost, easy to pollute the environment, etc., and achieve the effects of improving working conditions, high-efficiency enrichment, and simple process

Inactive Publication Date: 2013-02-13
荣杨
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Precious metal electronic scraps from electronic appliances mainly include: waste circuit boards (including printed circuit boards, integrated circuit boards), etc. Commonly used processing technologies include mechanical crushing, hydrometallurgy, pyrometallurgy or a combination of several technologies, but the other The recycling process has the disadvantages of high energy consumption, easy pollution of the environment, low production efficiency, and high product cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The method includes the following steps:

[0024] (1) Pretreatment of electronic waste first: (a) take 1000g electronic waste, mechanically crush and sieve to obtain electronic waste powder; (b) take electronic waste powder, separate and remove rubber and plastic materials by electrostatic separation, and collect precious metal rich Collectively; (c) Take precious metal-enriched bodies, remove ferromagnetic metals by magnetic separation, and collect non-ferromagnetic metal-enriched bodies;

[0025] Then dry the pretreated electronic waste with 200g of iron powder, 50g of lime and 50g of carbon powder, grind them, and mix them evenly;

[0026] (2) Put the mixed material into a graphite crucible and place it in a box-type resistance furnace or an electric arc furnace, heat up and reduce at a temperature of 1100°C for 1 hour, protect with nitrogen gas, and cool with water after reduction to allow the precious metal to enter the alloy;

[0027] (3) Selectively leaching the...

Embodiment 2

[0030] The method includes the following steps:

[0031] (1) Pretreatment of electronic waste first: (a) take 1000g electronic waste, mechanically crush and sieve to obtain electronic waste powder; (b) take electronic waste powder, separate and remove rubber and plastic materials by electrostatic separation, and collect precious metal rich Collectively; (c) Take precious metal-enriched bodies, remove ferromagnetic metals by magnetic separation, and collect non-ferromagnetic metal-enriched bodies;

[0032] Then dry the pretreated electronic scrap with 250g of iron oxide, 80g of sodium sulfate and 80g of carbon powder, pulverize and mix evenly;

[0033] (2) Put the mixed material into a graphite crucible and place it in a box-type resistance furnace or an electric arc furnace, heat up and reduce at a temperature of 1200°C for 3 hours, pass nitrogen protection, and cool with water after reduction to allow the precious metal to enter the alloy;

[0034] (3) Selectively leaching t...

Embodiment 3

[0037] The method includes the following steps:

[0038] (1) Pretreatment of electronic waste first: (a) take 1000g electronic waste, mechanically crush and sieve to obtain electronic waste powder; (b) take electronic waste powder, separate and remove rubber and plastic materials by electrostatic separation, and collect precious metal rich Collectively; (c) Take precious metal-enriched bodies, remove ferromagnetic metals by magnetic separation, and collect non-ferromagnetic metal-enriched bodies;

[0039] Then dry the pretreated electronic waste with 300g of iron oxide, 100g of lime and 100g of carbon powder, pulverize them, and mix them evenly;

[0040] (2) Put the mixed material into a graphite crucible and place it in a box-type resistance furnace or an electric arc furnace, heat up and reduce at a temperature of 1350°C for 4 hours, protect with nitrogen gas, and cool with water after reduction to allow the precious metal to enter the alloy;

[0041] (3) Selectively leachi...

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PUM

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Abstract

The invention discloses a method for recovering precious metal from electronic waste. The method is simple in process, low in cost and capable of gathering the precious metal efficiently. The method includes the following steps: (1) preprocessed electronic waste, a trapping agent and a reducing agent are dried, smashed and mixed evenly; (2) the mixed materials are put in a graphite crucible and placed in a box-type resistance furnace or an electric-arc furnace, temperature rises, reduction is performed, gas is led in to perform protection, and water cooling is performed after reduction so as to enable the precious metal to enter alloys; (3) alloy phase containing the precious metal is immersed in base metal selectively to obtain precious metal enrichment; and (4) the precious metal enrichment is refined by using the hydrometallurgy technology to obtain platinum, palladium, rhodium products.

Description

technical field [0001] The invention relates to a method for recovering precious metals, in particular to a method for recovering precious metals from electronic waste. Background technique [0002] Precious metals, especially platinum group precious metals, have unique physical and chemical properties and are widely used in various fields such as military industry, petroleum, chemical industry, organic synthesis, microelectronics technology, exhaust gas purification, etc., and play an irreplaceable role in modern high-tech industries. effect. Among the platinum group precious metals, platinum and palladium are the most widely used, but the output is extremely low. According to statistics, the annual output in the world is less than 200 tons, and the annual output in my country is even less than 1 ton. For these precious metal ores, if they can reach the gram / ton level, they are rich ores and have industrial mining value. However, in some wastes containing precious metals,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 荣杨
Owner 荣杨
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