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 remo

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
Comparison scheme
Effect test

Example Embodiment

[0030]Example 1

[0031]A method of comprehensive utilization of microwave thermal solution of waste computer board, the specific steps are as follows:

[0032]Put the circuit board in a high temperature hot furnace before the pyrolysis is 10 min after heating to 250 ° C. Manually remove the components above the board, then use the shear to cut the board to 1cm2Small block. Turn on the coolant circulation pump to set the condensed water temperature in the circulating cooling system to -3 ° C. When the board small block is loaded into the microwave, after the intake is complete, first access the air in 10 min nitrogen emptying the pipe, and then at a microwave strength of 10 g / 1 kW, the temperature rise rate is 25 ° C / min, and the temperature is allowed to 400. The thermal solution was 10.1 l / min during the pyrolysis process.

[0033]The solid obtained by the pyrolysis is 77.9%, 13.7%, 8.4%, respectively. By analyzing the recovery of copper and tin in a solid product after microwave (th...

Example Embodiment

[0034]Example 2 (Add toner in the circuit board, other conditions are the same as in Example 1)

[0035]A method of comprehensive utilization of microwave thermal solution of waste computer board, the specific steps are as follows:

[0036]Put the circuit board in a high temperature hot furnace before the pyrolysis is 10 min after heating to 250 ° C, and the recovery solder is enhanced, and the democlasion is advanced. Manually remove the components above the board, then use the shear to cut the board to 1cm2Small block. Turn on the coolant circulation pump to set the condensed water temperature in the circulating cooling system to -3 ° C. Mix the circuit board small pieces into a 5% mass-parts of coke powder to be loaded into the microwave, after the intake is complete, first pass through the air in 10 m into nitrogen air venting pipe, then at 10 g / 1 kW microwave strength, heating rate It was 60 ° C / min, warmed to 400 ° C for 1 h, and the nitrogen flow rate was controlled 0.1 L / min...

Example Embodiment

[0043]Example 3 (Other Different Pyrolysis Temperature as in Example 2)

[0044]Controlling other conditions is exactly the same as in Example 2, only controlling the pyrolysis temperature, obtaining a different thermolyte temperature, and the pyrolytic oil component is as follows.

[0045]Table 2 Effect of Pyrolysis Temperature on TXDN Liquid Product Components

[0046]

[0047]As shown in the figure, it can be seen that the pyrolysis temperature is rising, the solid residue is reduced, and the liquid yield is increased, and the trend is reduced, and the maximum value is 15.15% at 600 ° C; the gas yield is gradually increased. In the range of 500-600 ° C, the high molecular chain such as epoxy resin contained in the material is broken into a long chain compound, so the liquid product is increased; the liquid product is in volatilizing the reactor as the temperature continues to increase The secondary decomposition reaction occurs, the long chain compound further cracks reaction, turns into a s...

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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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