Method for recycling valuable metal from electronic waste

An electronic waste and valuable metal technology, applied in the direction of improving process efficiency, can solve problems such as difficulty in meeting industrialized production, low recovery rate of valuable metals, lower overall yield, etc., and achieve low production costs and valuable metals. The effect of high recovery rate and high recovery rate

Active Publication Date: 2015-11-25
河南省冶金研究所有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a high leaching rate and can produce various metal salts. However, this method lacks selectivity and requires a high-intensity separation and purification process for the leaching solution, resulting in a decrease in overall yield and an increase in cost. Moreover, the concentration of residual acid after leaching is high, making it difficult to reuse.
[0008] The above methods have their own advantages and disadvantages, but they all have the disadvantages of complex process, high investment cost, and low recovery rate of valuable metals, which are difficult to meet the needs of industrial production

Method used

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  • Method for recycling valuable metal from electronic waste

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Effect test

Embodiment 1

[0033] The method for recovering valuable metals from electronic waste in this embodiment, such as figure 1 shown, including the following steps:

[0034] 1) Put 500g of electronic waste containing copper and silver into a 2L container, prepare 500ml of sulfuric acid with a mass concentration of 40%, and add it to the container to ensure that the sulfuric acid is completely submerged in the electronic waste to obtain mixture A;

[0035] 2) After raising the temperature of the mixture A obtained in step 1) to 60°C, use an ozone generator to generate ozone from the bottom of the mixture A for reaction, and stir at 100rpm to ensure that the ozone is evenly dispersed in the system, and the amount of ozone introduced is 1L / h (that is, the amount of ozone per 1kg of electronic waste is 2L / h), and the reaction time is 4h; after the reaction, stop feeding ozone to obtain mixture B;

[0036] 3) Use a 10-mesh filter to separate the electronic waste matrix (organic polymer material mat...

Embodiment 2

[0039] The method for recovering valuable metals from electronic waste in this embodiment, such as figure 1 shown, including the following steps:

[0040] 1) Put 500g of electronic waste into a 2L container, prepare 500ml of sulfuric acid with a mass concentration of 50%, and add it into the container to ensure that the sulfuric acid is completely submerged in the electronic waste to obtain mixture A;

[0041] 2) After raising the temperature of the mixture A obtained in step 1) to 50°C, use an ozone generator to generate ozone from the bottom of the mixture A for reaction, and stir at 200rpm to ensure that the ozone is evenly dispersed in the system, and the amount of ozone introduced is 1L / h (that is, the amount of ozone per 1kg of electronic waste is 2L / h), and the reaction time is 3h; after the reaction, stop feeding ozone to obtain mixture B;

[0042] 3) Use a 15-mesh filter to separate the electronic waste matrix (organic polymer material matrix) in the mixture B obtai...

Embodiment 3

[0045] The method for recovering valuable metals from electronic waste in this embodiment, such as figure 1 shown, including the following steps:

[0046] 1) Put 500g of electronic waste into a 2L container, prepare 500ml of sulfuric acid with a mass concentration of 60%, and add it into the container to ensure that the sulfuric acid is completely immersed in the electronic waste to obtain mixture A;

[0047] 2) After raising the temperature of the mixture A obtained in step 1) to 40°C, use an ozone generator to generate ozone from the bottom of the mixture A for reaction, while stirring at 300rpm to ensure that the ozone is evenly dispersed in the system, and the amount of ozone introduced is 1L / h (that is, the amount of ozone per 1kg of electronic waste is 2L / h), and the reaction time is 2h; after the reaction, stop feeding ozone to obtain mixture B;

[0048] 3) Use a 20-mesh filter to separate the electronic waste matrix (organic polymer material matrix) in the mixture B ...

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Abstract

The invention discloses a method for recycling valuable metal from electronic waste. The method comprises the following steps that 1, the electronic waste is immersed into sulfuric acid to obtain a mixture A; 2, ozone is introduced to react with the mixture A after the mixture A is heated to 40-60 DEG C, and a mixture B is obtained after the reaction is completed, wherein the amount of the introduced ozone corresponding to every one kg of electronic waste is not less than 2 L/h, and the reaction time is not less than 2 h; and 3, the mixture B is subjected to solid-liquid separation, and obtained liquid is copper sulfate solution. According to the method, the electronic waste does not need to be smashed before being subjected to acid immersion; the method is implemented at low temperature and normal pressure, investment is less relatively, and the operating cost is low; the process is simple, energy consumption is low, the production cost is low, the recovery rate of the valuable metal is high, and the method is applicable to large-scale industrial production; the ozone used for the method cannot pollute the environment, no pollutants such as sulfur dioxide can be produced in the leaching process, and good economic benefits and environmental benefits are realized.

Description

technical field [0001] The invention belongs to the technical field of electronic waste treatment, and in particular relates to a method for recovering valuable metals from electronic waste. Background technique [0002] Electronic waste, also known as electronic waste, refers to electrical appliances or electronic equipment that are discarded and no longer used, mainly including household appliances such as refrigerators, air conditioners, washing machines, and televisions, and electronic communication products such as computers. Electronic waste is not waste, but a secondary resource to be developed, which has a high recycling value. The grade of metals contained in electronic waste, especially precious metals, is dozens or even hundreds of times higher than that of natural mineral deposits, and the recycling cost is generally lower than that of mining natural mineral deposits. Statistics show that it costs about US$300,000 to mine 1 ton of silver from raw ore, but it onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00C22B15/00
CPCY02P10/20
Inventor 高岩李金辉许小菊罗春祥陈士强李鹏举徐红辉运晓静耿翠翠李炯
Owner 河南省冶金研究所有限责任公司
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