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Method for purifying AgCd alloy from AgCd waste and recycling AgCd alloy

A waste and alloy technology, which is applied in the field of purification and recycling of AgCd alloys, can solve the problems of low utilization rate, poor product processing performance, and comparison, and achieve the effects of fast material turnover, no industrial three waste pollution, and significant economic benefits

Active Publication Date: 2020-04-17
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1) Directly used for feeding into the furnace; due to the existence of impurity elements in the AgCd waste, the product obtained by direct feeding has a high content of impurity elements, and the product processing performance is poor, so the utilization rate of this recycling method is low
[0004] 2) After smelting and purification, it is used for feeding; in the high-temperature smelting process, the AgCd waste is melted and separated from impurity elements, and the impurities float on the surface of the liquid phase, and the surface scum is removed by liquid slag removal for impurity removal; but due to the liquid phase Fluidity, still cannot completely remove the impurity elements in AgCd waste, so the processability of AgCdO products fed with this type of recycled materials is still not comparable to that of virgin materials
[0005] The traditional AgCd recycling process cannot completely separate the precious metal AgCd alloy from impurities. Therefore, a self-filtering recycling method for AgCd waste is developed to effectively separate undesirable impurities and extract high-purity AgCd alloy raw materials to reach the same level as new materials; it can effectively Utilize the AgCd alloy elements in the waste, and can greatly shorten the material turnover period at the same time, which has high practical value

Method used

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  • Method for purifying AgCd alloy from AgCd waste and recycling AgCd alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Set the density of the equal area to 0.32g / cm 3 , 64% porosity, 35nm-950um pore size, 0.8 mm thick SiC foam ceramic sheet is placed at the bottom of the crucible, and then 25Kg AgCd10.5 scraps are placed, and the melting and refining is carried out in three stages: the first stage: heating up to 500°C Constant temperature for 0.5h; second stage: heating up to 900°C and constant temperature for 0.5h; third stage: 800°C, cooling at a constant speed, and controlling the cooling time for 0.5h;

[0021] 2) taking out the ceramic foam sheets floating on the surface of the melt to obtain a high-purity AgCd alloy melt;

[0022] 3) The AgCd alloy is used to feed AgCdO (10), and the product performance comparison is shown in the following table:

[0023]

Embodiment 2

[0025] 1) Set the density of the equal area to 0.42g / cm 3 Al with a porosity of 78%, a pore size of 45nm-865um, and a thickness of 0.6 mm 2 o 3 The foam ceramic sheet is placed at the bottom of the crucible, and then 22Kg of AgCd13.13 trimmings are put in, and the melting and refining is carried out in three stages: the first stage: the temperature is raised to 600°C for 1 hour; the second stage: the temperature is raised to 1000°C and the temperature is held for 1 hour; the third stage Stage: 900°C, cooling at a constant speed, and controlling the cooling time for 0.5h;

[0026] 2) taking out the ceramic foam sheets floating on the surface of the melt to obtain a high-purity AgCd alloy melt;

[0027] 3) Using the AgCd alloy to feed AgCdO (12), the product performance comparison is shown in the following table:

[0028]

Embodiment 3

[0030] 1) ZrO with an equal area density of 1.27g / cm3, a porosity of 86%, a pore diameter of 68nm-730um, and a thickness of 1.2mm 2 The ceramic foam piece is placed at the bottom of the crucible, and then 20Kg of AgCd8.75 corner material is put in, and the melting and refining is carried out in three stages: the first stage: the temperature is raised to 600°C and kept at a constant temperature for 0.5h; the second stage: the temperature is raised to 1000°C and held at a constant temperature for 0.5h; The third stage: 800°C, cooling at a constant speed, and the controlled cooling time is 1h;

[0031] 2) taking out the ceramic foam sheets floating on the surface of the melt to obtain a high-purity AgCd alloy melt;

[0032] 3) Using the AgCd alloy to feed AgCdO (15), the product performance comparison is shown in the following table:

[0033] Resistivity μΩ·cm Tensile strength MPa Elongation % New material feeding 2.21 330 22 Feeding of this patented ...

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Abstract

The invention discloses a method for purifying an AgCd alloy from AgCd waste and recycling the AgCd alloy. The method comprises the steps that equal-area foam ceramic sheets are placed at the bottom of a smelting furnace, then the AgCd waste is placed, and high-temperature smelting treatment is conducted; after refining is completed, the foam ceramic sheets floating on the surface of a melt are taken out, and the high-purity AgCd alloy is obtained; and the AgCd alloy serves as a raw material to prepare an AgCdO material. An electric contact material fed by adopting the high-purity AgCd alloy is high in raw material purity and low in impurity, and thus has good physical and chemical property and excellent machining property. By adopting the method, AgCd leftover materials generated in the production process of the AgCd electric contact material are recovered and reutilized, AgCd alloy elements in the waste are effectively recovered, material transferring is quick, and economic benefitsare remarkable.

Description

technical field [0001] The invention relates to the technical field of electric contact materials, in particular to a method for purifying AgCd alloy from AgCd waste and recycling it. Background technique [0002] AgCdO electrical contact materials will produce about 30% AgCd waste during the production and processing process, and the high proportion of waste will lead to high product costs. In order to effectively reduce production costs, the effective reuse of AgCd waste has become a research hotspot in recent years. The core of waste recycling is to effectively separate the precious metal alloy AgCd from undesired impurities and extract high-purity AgCd alloys. There are usually two ways to reuse AgCd waste: [0003] 1) Directly used for feeding into the furnace; due to the existence of impurity elements in the AgCd waste, the product obtained by direct feeding has a high content of impurity elements, and the product processing performance is poor, so the utilization rat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B9/02C22C1/02
CPCC22B7/001C22B9/023C22C1/02Y02P10/20
Inventor 张秀芳周克武宋振阳黄文明黄钟柏小平
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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