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Microwave pyrolysis comprehensive utilization method for waste computer circuit boards

A circuit board and pyrolysis technology, which is applied in the field of comprehensive utilization of microwave pyrolysis of waste computer circuit boards, can solve the problems of difficult removal of bromine, reduction, and influence of separation methods

Pending Publication Date: 2021-05-07
楚雄滇中有色金属有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of method recovers valuable metals, it has the following problems: the pyrolysis process will generate harmful gases such as dioxins, which will cause serious environmental risks; the harmful component bromine is difficult to remove; the valuable metals are oxidized, copper, tin Waiting for the phase change of valuable metals to form oxides, which will affect the separation method of the solid phase after pyrolysis, and reduce the available separation and extraction methods

Method used

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  • Microwave pyrolysis comprehensive utilization method for waste computer circuit boards
  • Microwave pyrolysis comprehensive utilization method for waste computer circuit boards
  • Microwave pyrolysis comprehensive utilization method for waste computer circuit boards

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A method for comprehensive utilization of waste computer circuit boards by microwave pyrolysis, the specific steps are as follows:

[0032] Before pyrolysis, put the circuit board into a high-temperature hot air furnace, raise the temperature to 250°C and keep it warm for 10 minutes, vibrate to recover the solder, and perform detinning pretreatment first. Manually remove the components on the circuit board, and then cut the circuit board to 1cm with a board shear 2of small pieces. Turn on the coolant circulating pump, and set the temperature of the condensed water in the circulating cooling system to -3°C. Put the small pieces of the circuit board into the microwave oven. After checking the airtightness, first pass in nitrogen for 10 minutes to evacuate the air in the pipeline, and then under the microwave intensity of 10g / 1KW, the heating rate is 25°C / min, and the temperature is raised to 400 ℃ pyrolysis 1h, control the nitrogen flow rate 0.1L / min during the pyrolysi...

Embodiment 2

[0034] Embodiment 2 (add carbon powder in the circuit board, other conditions are identical with embodiment 1)

[0035] A method for comprehensive utilization of waste computer circuit boards by microwave pyrolysis, the specific steps are as follows:

[0036] Before pyrolysis, put the circuit board into a high-temperature hot air furnace, raise the temperature to 250°C and keep it warm for 10 minutes, vibrate to recover the solder, and perform detinning pretreatment first. Manually remove the components on the circuit board, and then cut the circuit board to 1cm with a board shear 2 of small pieces. Turn on the coolant circulating pump, and set the temperature of the condensed water in the circulating cooling system to -3°C. Mix the small pieces of the circuit board with 5% coke powder by mass and put them into a microwave oven. After checking the airtightness, first pass in nitrogen for 10 minutes to exhaust the air in the pipeline, and then under the microwave intensity of...

Embodiment 3

[0043] Embodiment 3 (other is identical with embodiment 2, controls different pyrolysis temperature)

[0044] Control other conditions are identical with embodiment 2, only control pyrolysis temperature, obtain under different pyrolysis temperature, the situation of pyrolysis oil composition is as follows.

[0045] Table 2 The influence of pyrolysis temperature on the composition of TXDN liquid product

[0046]

[0047] It can be seen from the figures and tables that as the pyrolysis temperature rises, the solid residue yield decreases, and the liquid yield increases first and then decreases, reaching a maximum value of 15.15% at 600°C; the gas yield gradually increases. In the range of 500-600 ° C, the polymer chains such as epoxy resin contained in the material are heated and broken into long-chain compounds, so the liquid product increases; as the temperature continues to increase, the liquid product is before the volatiles escape the reactor. A secondary decomposition ...

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Abstract

The invention relates to a microwave pyrolysis comprehensive utilization method for waste computer circuit boards, and belongs to the technical field of waste electronic product recycling. The method comprises the steps: preheating the circuit boards to remove soldering tin, cutting the circuit boards into small blocks, adding carbon powder for microwave pyrolysis, and controlling microwave pyrolysis conditions to achieve comprehensive utilization of the waste computer circuit boards. According to the method, bromine in the circuit boards can be effectively removed, meanwhile, generation of toxic gas such as dioxin is avoided, pyrolysis oil and pyrolysis gas with high calorific value are generated, and full, high-calorific-value and comprehensive utilization of all components of the circuit boards is achieved.

Description

technical field [0001] The invention belongs to the technical field of recycling waste electronic products, and in particular relates to a method for comprehensive utilization of waste computer circuit boards by microwave pyrolysis. Background technique [0002] Since the late 20th century, science and technology have been changing with each passing day, the global economy has developed rapidly, and the development of science and technology has also caused earth-shaking changes in the electrical and electronic industries and the communication industry. More and more discarded electronic equipment, such as: printers, computers, mobile phones, televisions, air conditioners and other household electronic product wastes, as well as some discarded electronic computers, have resulted in a huge amount of electronic waste. Statistics show that the world produces about 40-50 million tons of electronic waste every year, and it is still growing at a rate of 3-5% per year. [0003] If ...

Claims

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Application Information

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IPC IPC(8): C10B53/00C10B57/12B01J19/14B01J19/12
CPCC10B53/00C10B57/12B01J19/14B01J19/126
Inventor 刘大方舒波夏洪应张利波李江平王恩志刘承飞张鑫张威曾抗庆余彬陈习堂杨益芬田强坤
Owner 楚雄滇中有色金属有限责任公司
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