Noble metalregeneration recovering method for electronic waste material

An electronic waste and recycling method technology, applied in the direction of improving process efficiency, can solve the problems of complex composition, high technical requirements, low content of precious metals in waste, etc., and achieve the effect of advanced technology, obvious economic and social benefits, and low cost.

Inactive Publication Date: 2003-11-26
ZHEJIANG METALLURGICAL RES INST
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Problems solved by technology

At present, my country has a mature recycling technology for recycling precious metals from high-content wastes containing precious metals, such as catalysts scrapped in industries such as medicine and petrochemical industries, but the technology for recycling low-content wastes containing precious metals is still far behind. Mature and in the research stage, the main reason is that these low-content precious metal wastes have only gradually begun to be produced in recent years, and these wastes have low precious metal content, relatively complex components, and relatively high technical requirements for recycling

Method used

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Embodiment Construction

[0008] The present invention will be described in detail below:

[0009] The present invention mainly includes four major processes of pretreatment, oxidation leaching, leachate replacement and expensive mud fine extraction. 1. Pretreatment: Select 20Kg of waste electronic components, and make them into powder after wet ball milling. After sieving and filtering, the powders containing precious metals less than 40 meshes are filtered out. The powders larger than 40 meshes are removed by magnetic separation. Carry out wet ball milling, sieve and filter out the precious metal-containing powder less than 40 meshes, generally can obtain 3.86kg of iron-containing scraps, 16.14kg of precious metal-containing powder, and the precious metal-containing powder is used in the next process.

[0010] 2. Oxidative leaching: the acidity of the first leaching, that is, water: hydrochloric acid = 3:1, the concentration of leaching, that is, liquid: solid = 4:1, hydrogen peroxide: solid = 1:3, c...

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Abstract

The noble metal regenerating and recovering method from electronic waste material includes pre-treatment of grinding, magnetically selecting and sieving to obtain noble metal containing powder; oxidation to loeaching through adding hydrochloric acid and complexing agent, dropping hydrogen peroxide while heating, leaching for at least 1.5 hr, eliminating superntant to obtain leaches liquid; addingiron powder into the leached liquid to obtain noble metal sludge via replacement; extracting from nobile metal sludge through leaching noble metal sludge, complex salt deposition, adding oxidant until producing chlorine and obtaining complex salt deposit; and purifying Pd. The present invention has the advantages of advanced technological process, low cost and high efficiency.

Description

technical field [0001] The invention relates to a method for regenerating and recovering precious metals from low-content waste containing precious metals, in particular to a method for regenerating and recovering precious metals from waste electronic materials. 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 ri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/10C22B7/00
CPCY02P10/20
Inventor 姚洪王洪涛傅昌荣林桂燕裘忠富沈强李广安胡国良
Owner ZHEJIANG METALLURGICAL RES INST
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