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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

AI Technical Summary

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 the chemical method, the circuit board is first oxidized with concentrated sulfuric acid or nitric acid, and then other metals are added to replace the copper ions, or the solution is directly heated to obtain copper sulfate crystals. These methods have low recovery rate, high corrosion or processing costs. High disadvantage

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
Effect test

Embodiment 1

[0042] Put the pulverized printed circuit board into the three-phase bed, then add 5 mol / L of oxygen carrier nitric acid, the weight ratio of the two is 1:10, adjust the pH value of the solution to be greater than 1.0 with sulfuric acid, and press the oxygen into the three-phase bed with a high-pressure pump. phase bed, and then the reactants were heated to 60° C., and reacted for 6 hours. After the printed circuit board was completely oxidized, the filtrate was obtained by filtration. Under room temperature conditions, the extractant and the filtrate are mixed, the ratio (O / A) is 2: 1, the concentration of the extractant is 30%, the pH value is adjusted to 2.0 with mineral acid, and the set stirring speed is 910r / min, the stirrer stirs the mixed solution, through the secondary extraction and the primary stripping, the time of each stage is 3min, and the copper sulfate solution 40g / L that meets the electrowinning requirements can be obtained. Then put the copper sulfate solut...

Embodiment 2

[0044] Put the pulverized printed circuit board into the 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 greater than 1.0 with sulfuric acid, and use a high-pressure pump to Oxygen gas is injected into the three-phase bed, and then the reactant is heated to 90° C., and reacted for 4 hours. After the printed circuit board is completely oxidized, the filtrate is obtained by filtration. Under room temperature conditions, the extractant and the filtrate are mixed, the ratio (O / A) is 10:1, the concentration of the extractant is 10%, the pH value is adjusted to 1.0 with mineral acid, and the set stirring speed is 100r / min, the stirrer stirs the mixed solution, through the secondary extraction and the primary stripping, the time of each stage is 1min, and the copper sulfate solution 45g / L that meets the electrowinning requirements can be obtained. Then put the copper sulfate sol...

Embodiment 3

[0046] Put the crushed printed circuit board into the three-phase bed, then add 0.01mol / L of nitric acid as an oxygen carrier, adjust the pH value of the solution to be greater than 1.0 with sulfuric acid, press oxygen into the three-phase bed with a high-pressure pump, and then heat the reactants to 80° C., react for 4 hours, and when the printed circuit board is completely oxidized, filter to obtain a filtrate. Under room temperature conditions, the extractant and the filtrate are mixed, the ratio (O / A) is 1: 1, the concentration of the extractant is 100%, the pH value is adjusted to 3.5 with mineral acid, and the set stirring speed is 1300r / min, the stirrer stirs the mixed solution, through the secondary extraction and the primary stripping, the time of each stage is 10min, and the copper sulfate solution 50g / L that meets the electrowinning requirements can be obtained. Then put the copper sulfate solution into the electrolytic cell for electrowinning, the temperature of t...

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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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