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Method for efficiently enriching precious metal from electronic waste

A technology for electronic waste and precious metals, applied in the direction of improving process efficiency, etc., can solve the problems of difficult extraction of precious metals, achieve high yield of precious metals, facilitate subsequent electrolysis, and high enrichment ratio of precious metals

Inactive Publication Date: 2016-08-24
KUNMING METALLURGY COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Electronic waste contains a variety of non-ferrous metals, and it is difficult to extract precious metals from electronic waste economically and effectively by a single wet method or fire method

Method used

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  • Method for efficiently enriching precious metal from electronic waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] See attached figure 1 , conditions: electronic waste crushing, weight 5000 grams, electronic waste crushing, adding copper oxide concentrate is 40% of the weight ratio of electronic waste, the reducing agent is coke powder, the amount added is 3% of the weight ratio of electronic waste, slagging agent is added The amount is 30% of the weight ratio of electronic waste, mixed evenly, and placed in an electric arc furnace for smelting to obtain blister copper, and the precious metal is effectively captured; the blister copper is then electrolyzed, and the precious metal enters the copper anode slime, realizing the initial enrichment of the precious metal; Mix the copper anode slime material with sulfuric acid and hydrogen peroxide. The amount of sulfuric acid is 50% of the weight ratio of the copper anode slime, and the amount of hydrogen peroxide is 60% of the weight ratio of the copper anode slime. It is placed in a reaction kettle for leaching. The reaction temperature i...

Embodiment 2

[0022] See attached figure 1, Conditions: electronic waste crushing, weight 5000 grams, electronic waste crushing, adding scrap copper is 20% of electronic waste weight ratio, reducing agent is anthracite, adding amount is 5% of electronic waste weight ratio, slagging agent adding amount is 40% of the weight ratio of electronic waste, mixed evenly, placed in an electric arc furnace for smelting to obtain blister copper, and the precious metals were effectively captured; the blister copper was then electrolyzed, and the precious metals entered the copper anode slime, realizing the initial enrichment of precious metals; The anode slime material is mixed with sulfuric acid and hydrogen peroxide. The amount of sulfuric acid is 60% of the weight ratio of the copper anode slime, and the amount of hydrogen peroxide is 40% of the weight ratio of the copper anode slime. It is placed in a reaction kettle for leaching. The reaction temperature is 85 ° C, the time is 4 hours, liquid-solid ...

Embodiment 3

[0024] See attached figure 1 , Conditions: electronic waste crushing, weight 5000 grams, electronic waste crushing, adding electrolytic cathode copper is 20% of the weight ratio of electronic waste, the reducing agent is coke powder, the amount added is 2% of the weight ratio of electronic waste, and the amount of slagging agent It is 40% of the weight ratio of electronic waste, mixed evenly, and placed in an electric arc furnace for smelting to obtain blister copper, and the precious metal is effectively captured; the blister copper is then electrolyzed, and the precious metal enters the copper anode slime, realizing the initial enrichment of the precious metal; The copper anode slime material is mixed with sulfuric acid and hydrogen peroxide. The amount of sulfuric acid is 60% of the weight ratio of the copper anode slime, and the amount of hydrogen peroxide is 70% of the weight ratio of the copper anode slime. It is placed in a reaction kettle for leaching. The reaction temp...

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Abstract

The invention discloses a method for efficiently enriching precious metal from electronic waste. Particularly, anode slime is obtained from the electronic waste which is subjected to copper smelting capture and then subjected to electrolysis. The method comprises the steps that the electronic waste is crushed, added with copper, a reducing agent and a slag former and placed in an electric arc furnace to be smelted, so that crude copper is obtained, and the precious metal is effectively captured; the crude copper is then subjected to electrolysis, the precious metal enters copper anode slime, and thus preliminary enrichment of the precious metal is achieved; the copper anode slime material is mixed with sulfuric acid and hydrogen peroxide and placed in a reaction kettle to be leached, so that acid leaching residue and acidic leaching liquid are obtained; the acid leaching residue is added with sodium hydroxide and sodium carbonate and subjected to alkali leaching, so that alkali leaching residue and alkali leaching liquid are obtained; and the alkali leaching residue is added with nitric acid to be leached, and lead enters the solution, so that the enriched precious metal is obtained after filtering and washing are conducted. The enriched precious metal is obtained from the electronic waste. The method for efficiently enriching the precious metal from the electronic waste is easy to operate, environmentally friendly, low in production cost, easy to industrialize, high in precious metal yield and good in application prospect.

Description

technical field [0001] The invention belongs to the field of rare metal metallurgy and relates to a method for efficiently enriching precious metals from electronic waste. Background technique [0002] Electronic waste contains a variety of non-ferrous metals, and it is difficult to extract precious metals from electronic waste economically and effectively by a single wet method or fire method. The current electronic waste generally contains lead, copper, nickel, antimony, bismuth, tin, gold, silver, platinum, palladium, etc. and non-metallic materials. Low, to extract precious metals economically, pre-enrichment of precious metals is required. Through enrichment, the consumption of reagents for extracting precious metals is significantly reduced, the cost is greatly reduced, and the waste liquid, waste gas and waste residue generated are correspondingly reduced, and it is easy to treat and discharge up to standard. At present, there are several methods for enriching preci...

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 范兴祥余宇楠苏杰
Owner KUNMING METALLURGY COLLEGE
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