Co-pyrolysis method for alkaline residues and discarded printed wiring board

A waste circuit board, co-pyrolysis technology, applied in the field of resource utilization, can solve the problems of toxic substances polluting the environment, polluting the environment, and endangering health, and achieve the effects of solving environmental pollution, simple operation, and reducing recycling costs

Inactive Publication Date: 2018-08-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects existing in the existing methods for processing waste circuit boards, the purpose of the present invention is to provide a method for the collaborative treatment of alkali slag and waste circuit boards, and at the same time solve the toxic Substances pollute the environment, endanger health, and deal with difficulties, as well as the accumulation of a large amount of alkali slag, which seriously pollutes the environment. In particular, the use of alkali slag has a large specific surface area and catalytic adsorption can realize bromine in the pyrolysis process of waste circuit boards. Efficient fixation not only regulates the pyrolysis process of waste circuit boards, but also improves the resource utilization rate of alkali slag, achieving the purpose of efficient and full-resource clean recycling

Method used

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  • Co-pyrolysis method for alkaline residues and discarded printed wiring board

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Effect test

Embodiment 1

[0033] Take a waste circuit board without pre-breaking, disassemble the electronic components and recycle the solder, mix the alkali slag and the waste circuit board at a ratio of 2:1, carry out insufficient oxygen incomplete combustion, and directly heat and pyrolyze it. The amount is 0.6 times the theoretical molar amount of oxygen required for the full combustion of clean gas. The temperature in the furnace is guaranteed to be 700°C, the heating rate is controlled at 30°C / min, and the temperature is kept constant for 30 minutes. During this period, the volatiles are recycled through the condensation system. Pyrolysis gas, after the pyrolysis gas is purified by the alkali bottle, enters the gas storage tank for collection, the pyrolysis slag is separated by a 16-mesh standard sieve, and the products on the sieve are crushed and sorted to obtain metal materials and non-metal materials, and the metal materials are sent to In smelters, non-metallic materials are used as storage ...

Embodiment 2

[0035]Take a waste circuit board without pre-breaking, disassemble the electronic components and recycle the solder, mix the alkali slag and the waste circuit board at a ratio of 3:1, carry out insufficient oxygen incomplete combustion and directly heat pyrolysis, relative to the introduction of oxygen The amount is 0.6 times of the theoretical molar amount of oxygen required for the full combustion of clean gas. The temperature in the furnace is guaranteed to be 750°C, the heating rate is controlled at 20°C / min, and the temperature is kept constant for 50 minutes. During this period, the volatiles are recycled through the condensation system. Pyrolysis gas, after the pyrolysis gas is purified by the alkali bottle, enters the gas storage tank for collection, the pyrolysis slag is separated by a 16-mesh standard sieve, and the products on the sieve are crushed and sorted to obtain metal materials and non-metal materials, and the metal materials are sent to In smelters, non-metal...

Embodiment 3

[0037] Take a waste circuit board without pre-breaking, disassemble the electronic components and recycle the solder, mix the alkali slag and the waste circuit board at a ratio of 3:1, carry out insufficient oxygen incomplete combustion and directly heat pyrolysis, relative to the introduction of oxygen The amount is 0.6 times the theoretical molar amount of oxygen required for the full combustion of clean gas. The furnace temperature is guaranteed to be 800°C, the heating rate is controlled at 30°C / min, and the temperature is kept constant for 30 minutes. During this period, the volatiles are recycled through the condensation system. Pyrolysis gas, after the pyrolysis gas is purified by the alkali bottle, enters the gas storage tank for collection, the pyrolysis slag is separated by a 16-mesh standard sieve, and the products on the sieve are crushed and sorted to obtain metal materials and non-metal materials, and the metal materials are sent to In smelters, non-metallic mater...

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Abstract

The invention discloses a co-pyrolysis method for alkaline residues and a discarded printed wiring board. The method includes the steps that the discarded printed wiring board is subjected to heat treatment, soldering tin is removed and electronic components are dismantled; the discarded printed wiring board subjected to heat treatment and the alkaline residues are mixed and then are put into an atmosphere pyrolyzing furnace for oxygen-deficient non-sufficient combustion; after a pyrolysis volatile component is washed and purified, pyrolysis oil and pyrolysis gas are recovered, the pyrolysis gas serves as fuel gas to return to the atmosphere pyrolyzing furnace, a pyrolysis residue phase component is screened and separated, an oversize component is crushed and winnowed, and a metallic material and an inorganic nonmetallic material are recovered; and a screen underflow component returns to the atmosphere pyrolyzing furnace to be recycled. By adoption of the method, the alkaline residuesand the discarded printed wiring board are cooperatively treated, and various sorts of metal, nonmetal and organic matter in the discarded printed wiring board are fully recycled; and moreover, the alkaline residues can be fully utilized, the characteristics of being environmentally friendly and low in energy consumption are achieved, and full-resourcing clean recycling of the alkaline residues and the discarded printed wiring board is truly realized.

Description

technical field [0001] The invention relates to a method for recycling waste circuit boards, in particular to a method for co-pyrolyzing alkali slag and waste circuit boards to comprehensively recover metals, pyrolysis gas, pyrolysis oil and inorganic non-metallic materials, which belongs to resource utilization Utilize fields. Background technique [0002] With the advancement of science and technology, the number of electronic products has increased sharply and the use cycle has been shortened. About 45 million tons of electronic waste are discarded worldwide every year, and the annual growth rate is 5-10%. Electronic waste Electronic waste contains a large amount of toxic and harmful substances. If not handled properly, these substances will have a serious impact on the ecological environment and human health. Therefore, how to reasonably recycle and utilize electronic waste and reduce pollution emissions has become an urgent problem to be solved. The problem. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G5/027F23G7/00F23G5/44
CPCF23G5/027F23G5/44F23G5/444F23G7/00F23G7/006F23G2201/302F23G2201/303F23G2201/702
Inventor 韩俊伟刘维覃文庆焦芬许佳琦王荀钟雪虎
Owner CENT SOUTH UNIV
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