Method for extracting metal copper from electronical wastes

A technology of electronic waste and electrowinning, which is applied to the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of low copper recovery rate and grade, high treatment cost, high corrosion, etc., and achieve the treatment conditions are not harsh, High recovery rate and grade, corrosion reduction effect

Inactive Publication Date: 2007-07-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The physical method mainly uses gravity separation, magnetic separation, electrostatic separation and other methods to separate the copper in the metal mixture. The disadvantage is that the recovery rate and grade of copper are not high; the microbial method is not mature enough and is still in the stage of exploration; In

Method used

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  • Method for extracting metal copper from electronical wastes
  • Method for extracting metal copper from electronical wastes

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0041] Example 1

[0042] Put the crushed printed circuit board into a three-phase bed, and then add 5mol / L of oxygen carrier nitric acid, the weight ratio of the two is 1:10, adjust the pH value of the solution with sulfuric acid to be greater than 1.0, and use a high-pressure pump to air pressure the oxygen into the three phases. In the phase bed, the reactant was heated to 60°C and reacted for 6 hours. When the printed circuit board was completely oxidized, the filtrate was obtained by filtration. At room temperature, mix the extractant and the filtrate, the ratio (O / A) is 2:1, the concentration of the extractant is 30%, the pH value is adjusted to 2.0 with inorganic acid, and the stirring speed is set to 910r / min, the agitator stirs the mixed liquid, through secondary extraction and primary back extraction, each stage time is 3 minutes, 40g / L of copper sulfate solution meeting the electrowinning requirements can be obtained. Then put the copper sulfate solution into the elect...

Example Embodiment

[0043] Example 2

[0044] Put the crushed printed circuit board into a three-phase bed, stir evenly, then add 2.5mol / L of oxygen carrier nitric acid, the weight ratio of the two is 1:1, adjust the pH value of the solution to be greater than 1.0 with sulfuric acid, and use a high-pressure pump to Oxygen gas pressure is put into the three-phase bed, and then the reactant is heated to 90°C and reacted for 4 hours. When the printed circuit board is completely oxidized, the filtrate is obtained by filtration. At room temperature, mix the extractant and the filtrate, the ratio (O / A) is 10:1, the concentration of the extractant is 10%, the pH value is adjusted to 1.0 with inorganic acid, and the stirring speed is set to 100r / min, the agitator stirs the mixed solution, and through secondary extraction and primary back extraction, each stage time is 1 min, and 45g / L of copper sulfate solution meeting the electrowinning requirements can be obtained. Then put the copper sulfate solution int...

Example Embodiment

[0045] Example 3

[0046] Put the crushed printed circuit board into a three-phase bed, then add 0.01mol / L of oxygen carrier nitric acid, adjust the pH of the solution to be greater than 1.0 with sulfuric acid, use a high-pressure pump to pressurize oxygen into the three-phase bed, and then heat the reactants The reaction was carried out at 80°C for 4 hours. After the printed circuit board was completely oxidized, the filtrate was obtained by filtration. At room temperature, mix the extractant and the filtrate, the ratio (O / A) is 1:1, the concentration of the extractant is 100%, the pH value is adjusted to 3.5 with inorganic acid, and the stirring speed is set to 1300r / min, the agitator stirs the mixed liquid, through secondary extraction and primary back extraction, each stage time is 10 minutes, 50g / L of copper sulfate solution meeting the electrowinning requirements can be obtained. Then put the copper sulfate solution into the electrolytic cell for electrowinning. The cell te...

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Abstract

This invention relates to a method for extracting Cu from electrical wastes. The method comprises: utilizing electrical wastes such as printed circuit board as the raw materials, dissolving Cu by oxygen via indirect oxidation in a three-phase bed, extracting Cu by solvent extraction, performing back extraction, concentrating, and performing electrodeposition on the concentrate to obtain Cu with purity up to 99.99%. The method can recover Cu from electrical wastes such as printed circuit board, thus reducing environmental pollution.

Description

technical field [0001] The invention belongs to the field of inorganic chemistry, in particular to a method for extracting metal copper from electronic waste. Background technique [0002] Electronic waste such as printed circuit boards contains dozens of elements, so many elements bring great difficulties to the comprehensive treatment of electronic waste. And it contains a lot of highly toxic elements, if not handled properly, it will bring great harm to the environment and human health. At the same time, these elements also contain many valuable metals, among which copper has the highest content. If copper is not recycled and discarded directly, it will be a great waste of resources. According to data, 130 kg of copper can be separated from 1 ton of electronic boards (mobile phones and computers). Therefore, the development of a process for extracting metals from electronic waste such as printed circuit boards can not only eliminate its harm to the environment and human...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B15/00C22B3/06C22B3/20C25C1/12
CPCY02P10/20
Inventor 李登新张武学李志金
Owner DONGHUA UNIV
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