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Method for recycling and reusing silver graphite waste

A technology of waste recycling and silver graphite, which is applied in chemical instruments and methods, improvement of process efficiency, separation of solids from solids with airflow, etc., can solve the problem that silver powder cannot be reused as silver powder, takes a long time, and is unfavorable for environmental protection, etc. problems, to achieve the effects of environmental protection, reduction of recycling and production costs, and reduction of emissions

Active Publication Date: 2022-07-15
温州伟达贵金属粉体材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The disadvantages of the above schemes are that the decarburization process of graphite under the action of high temperature and oxygen takes a long time; The silver powder cannot be reused as silver powder after long-term high-temperature sintering

Method used

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  • Method for recycling and reusing silver graphite waste
  • Method for recycling and reusing silver graphite waste
  • Method for recycling and reusing silver graphite waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) drop silver graphite waste into induction melting furnace and heat, observe silver melting, stir to make silver graphite waste broken into silver graphite powder;

[0037] (2) stop stirring, stop heating, and take out the silver graphite powder ① from the smelting furnace for cooling;

[0038] (3) Cast the silver liquid in the smelting furnace into silver ingots ①, after the mold is water-cooled, take samples to detect impurities according to the national standard of silver ingots, and additionally measure the C% content, and C% is not higher than 0.0030%;

[0039] (4) Silver graphite powder ① Cooled to room temperature, put into the air mill and sieved, set the frequency of the classification wheel to 100Hz, and the compressed air pressure of 0.1MPa to obtain silver graphite powder For the silver graphite powder in the equipment, stop sieving when the graphite content is lower than 0.0030%;

[0040] (5) Replace the charging barrel, set the frequency of the grading...

Embodiment 2

[0044] (1) drop silver graphite waste into induction melting furnace and heat, observe silver melting, stirring makes silver graphite waste broken into silver graphite powder;

[0045] (2) Stop stirring, stop heating, and take out the silver graphite powder ① from the melting furnace for cooling;

[0046] (3) Cast the silver liquid in the smelting furnace into silver ingots ①, after the mold is water-cooled, take samples to detect impurities according to the national standard of silver ingots, and additionally measure the C% content, and C% is not higher than 0.0030%;

[0047] (4) Silver graphite powder ①Cool to room temperature, put it into the jet mill and sieve, set the frequency of the classification wheel to 120Hz, and the compressed air pressure to 0.2MPa to obtain silver graphite powder ②. For the silver graphite powder in the equipment, stop sieving when the graphite content is lower than 0.0030%;

[0048] (5) Replace the charging barrel, set the frequency of the clas...

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Abstract

The invention discloses a method for recovering and reusing silver graphite waste. The method comprises the following steps: preparing silver graphite powder, silver powder and silver ingot by smelting and crushing, separating, casting and sieving the silver graphite waste, and throwing them in respectively. Various products are used. The advantages of the invention are that the silver-graphite waste recycling avoids the decarburization process, reduces carbon dioxide gas emission, is beneficial to environmental protection, and at the same time recycles and reuses graphite powder and silver, thereby reducing recycling and production costs.

Description

technical field [0001] The invention belongs to the field of precious metal recovery, in particular to a method for recovering and reusing silver graphite waste. Background technique [0002] The silver-graphite electrical contact material has excellent welding resistance and low resistivity, and is widely used in low-voltage electrical appliances. For silver-graphite waste products, decarburization process is usually used to recover silver in the electrical alloy industry. The silver-graphite powder waste products produced by cutting in the production process are directly decarburized under the action of high temperature and oxygen in an air furnace of 500-800 °C to obtain silver horns. material. For extruded rod-shaped and extruded cylindrical cake-shaped wastes, the alloy block should be expanded and ruptured in a high temperature furnace with atmosphere protection above 960 °C, and then decarburized in an air furnace of 500-800 °C under the action of high temperature an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B11/02B07B7/083C01B32/205
CPCC22B7/005C22B7/001C22B11/025C01B32/205B07B7/083Y02P10/20
Inventor 周克武张秀芳代林涛金扬灯黄钟杨昌麟宋振阳林应涛王达武
Owner 温州伟达贵金属粉体材料有限公司