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A method for recovering valuable metals from waste circuit boards

A valuable metal, waste circuit board technology, applied in the improvement of process efficiency, furnace, shaft furnace and other directions, can solve the problems of low recovery rate of valuable metals, incomplete recovery and other problems, achieve low cost, improve recovery rate, operation simple effect

Active Publication Date: 2021-08-06
荆门格林循环电子废弃物处置有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the main purpose of the present invention is to provide a method for recovering valuable metals from waste circuit boards, which solves the problems of low recovery rate and incomplete recovery of valuable metals in waste circuit boards in the prior art

Method used

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  • A method for recovering valuable metals from waste circuit boards

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1, detinning the waste circuit board at 190°C to obtain the bare circuit board, solder and aluminum heat sink;

[0030] Step 2, crushing the bare circuit board obtained in step 1, and then performing magnetic separation to remove iron and eddy current separation to remove aluminum, respectively, to obtain iron material, aluminum material and circuit board crushed material with a particle size of 0-2 cm;

[0031] Step 3: Carry out pyrolysis treatment on the broken circuit board material obtained in step 2 at 500°C to obtain 28% by mass of copper, 12% by mass of carbon, gold content, silver content, palladium content Copper-containing carbon powder with a content of 30g / t, 300g / t, and 5g / t, and a mass percentage of tin, lead, and zinc of 2.6%, 1.2%, and 2%, respectively;

[0032] Step 4, take the following components by mass percentage: electroplating sludge 15%, limestone 8%, iron oxide ore 6%, coke 12%, the copper-containing carbon powder 59% that described step 3 ...

Embodiment 2

[0035] Step 1, detinning the waste circuit board at 180°C to obtain the bare circuit board, solder and aluminum heat sink;

[0036] Step 2, crushing the bare circuit board obtained in step 1, and then performing magnetic separation to remove iron and eddy current separation to remove aluminum, respectively, to obtain iron material, aluminum material and circuit board crushed material with a particle size of 0-2 cm;

[0037] Step 3, pyrolyzing the broken circuit board material obtained in step 2 at 450°C to obtain 25% by mass of copper, 13% by mass of carbon, gold content, silver content, palladium content Copper-containing carbon powder with a content of 25g / t, 350g / t, and 5g / t, and a mass percentage of tin, zinc, and lead of 2.2%, 1.6%, and 1.5%, respectively;

[0038] Step 4, weigh the following components respectively by mass percentage: electroplating sludge 10%, limestone 5%, iron oxide ore 10%, coke 10%, the copper-containing carbon powder 65% that described step 3 obtai...

Embodiment 3

[0041] Step 1, detinning the waste circuit board at 200°C to obtain the bare circuit board, solder and aluminum heat sink;

[0042] Step 2, crushing the bare circuit board obtained in step 1, and then performing magnetic separation to remove iron and eddy current separation to remove aluminum, respectively, to obtain iron material, aluminum material and circuit board crushed material with a particle size of 0-2 cm;

[0043] Step 3, pyrolyzing the broken circuit board material obtained in step 2 at 600°C to obtain 30% by mass of copper, 12% by mass of carbon, gold content, silver content, palladium content Copper-containing carbon powder with a content of 150g / t, 300g / t, and 10g / t, and a mass percentage of tin, lead, and zinc of 2.6%, 1.2%, and 2%, respectively;

[0044] Step 4, take the following components by mass percentage respectively: electroplating sludge 20%, limestone 5, iron oxide ore 10%, coke 10%, the copper-containing carbon powder 55% that described step 3 obtains...

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Abstract

The invention discloses a method for recovering valuable metals from waste circuit boards. The method is realized through the following steps: 1) performing detinning treatment on waste circuit boards to obtain bare circuit boards; 2) crushing the above bare circuit boards, and then Perform magnetic separation to remove iron and eddy current separation to remove aluminum in sequence to obtain iron material, aluminum material and circuit board crushed material respectively; 3) carry out pyrolysis treatment on the above-mentioned circuit board crushed material to obtain copper-containing carbon powder; 4) to the above-mentioned Carry out smelting treatment of copper-containing carbon powder to obtain blister phase, soot phase and slag phase; 5) further recycle the valuable metals in the above soot phase, blister phase and slag phase to obtain zinc, lead, copper, gold , silver, and palladium valuable metals; the present invention carries out low-temperature detinning, crushing, magnetic separation, iron removal, and eddy current separation and aluminum removal of waste circuit boards, and performs low-temperature pyrolysis and smelting treatment on the broken circuit board materials, and finally recycles Valuable metals are obtained, which effectively improves the recovery rate of valuable metals.

Description

technical field [0001] The invention belongs to the technical field of recovering valuable metals, and in particular relates to a method for recovering valuable metals from circuit boards. Background technique [0002] With the rapid development of the electronics industry and the high-tech information industry, the replacement and use cycles of electronic products are getting shorter and shorter, and a large number of electronic products are discarded, forming a large amount of electronic waste. Electronic waste, especially circuit boards, contains a large amount of toxic and harmful substances such as heavy metals such as lead, mercury, cadmium, chromium and other elements. If not handled properly, it will pose a great threat to the ecological environment and human health; in addition, in my country, including total Production and import of waste PCBs, more than 600,000 tons of waste PCBs need to be processed every year; and because the average service life of electronic pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B11/02C22B13/02C22B15/02C22B19/00
CPCC22B7/001C22B11/025C22B13/025C22B15/0032C22B19/00Y02P10/20
Inventor 许开华黄冬波王守荣贺锋华刘环宇朱君张于杰张刊
Owner 荆门格林循环电子废弃物处置有限公司