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Method for recycling and reusing silver graphite wastes

A technology of waste recycling and silver graphite, applied in chemical instruments and methods, improvement of process efficiency, separation of solids from solids with air flow, etc., can solve the problem that silver powder cannot be reused as silver powder, unfavorable for environmental protection, long time, etc. Problems, to achieve the effect of environmental protection, reduce emissions, reduce recycling and production costs

Active Publication Date: 2021-03-12
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 wastes
  • Method for recycling and reusing silver graphite wastes
  • Method for recycling and reusing silver graphite wastes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) the silver graphite waste product is dropped into the induction melting furnace and heated, and the silver melting is observed, and the silver graphite waste product is broken into silver graphite powder by stirring;

[0037] (2) stop stirring, stop heating, silver graphite powder 1. is taken out from melting furnace and cooled;

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

[0039] (4) Silver graphite powder ① Cool to room temperature, put it into the jet mill and sieve, set the classification wheel frequency to 100Hz, compressed air pressure 0.1MPa, obtain silver graphite powder ②, after the equipment is sieved and run for a period of time, take a sample and test the jet mill Silver graphite powder in the equipment, stop sieving when the graphit...

Embodiment 2

[0044] (1) the silver graphite waste product is dropped into the induction melting furnace and heated, and the silver melting is observed, and the silver graphite waste product is broken into silver graphite powder by stirring;

[0045] (2) stop stirring, stop heating, silver graphite powder 1. is taken out from melting furnace and cooled;

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

[0047] (4) Silver graphite powder ① Cool to room temperature, put it into the jet mill and sieve, set the classification wheel frequency to 120Hz, compressed air pressure 0.2MPa, obtain silver graphite powder ②, after the equipment is sieved and run for a period of time, take a sample and test the jet mill Silver graphite powder in the equipment, stop sieving when the graphit...

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Abstract

The invention discloses a method for recycling and reusing silver graphite wastes. The method includes the following steps of: preparing silver graphite powder, silver powder and a silver ingot from the silver graphite wastes by steps of smelting, crushing, separating, casting, sieving and the like; and respectively applying the silver graphite powder, the silver powder and the silver ingot to various products. The method disclosed by the invention has the advantages that in recycling of the silver graphite wastes, a decarburization process is not avoided, emission of carbon dioxide gas is reduced, environmental protection is facilitated, meanwhile, graphite powder and silver are recycled, and the recycling and production cost is reduced.

Description

technical field [0001] The invention belongs to the field of precious metal recovery, and specifically refers to a method for recycling and reusing silver graphite waste. Background technique [0002] Silver graphite electrical contact material has excellent welding resistance and low resistivity, and is widely used in low-voltage electrical appliances. It is produced by powder metallurgy process, and scraps and waste products will inevitably be produced during the production process. For silver graphite waste products, decarburization process is usually used in the electrical alloy industry to recover silver. The silver graphite powder waste products produced during the cutting process are directly decarburized in an air furnace at 500-800°C under the action of high temperature and oxygen to obtain silver horns. material. For extruded rod-shaped and extruded cylindrical cake-shaped waste products, the alloy block needs to be expanded and cracked in an atmosphere-protected ...

Claims

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Application Information

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Patent Type & Authority Applications(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