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Method for recycling valuable resources of waste glass fiber reinforced plastics and waste circuit boards

A technology of discarded circuit boards and recycling methods, applied in the direction of electronic waste recycling, recycling technology, solid waste removal, etc., can solve the problems of high energy consumption, high energy consumption, environmental pollution, and easy pollution of the environment, and achieve low energy consumption , optimize treatment conditions and procedures, and achieve high economic benefits

Inactive Publication Date: 2012-05-09
宋党记
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two types of equipment rely on shearing, impact and centrifugation to crush waste circuit boards. Although the crushing efficiency has been improved, they still have the disadvantages of high energy consumption and easy environmental pollution.
[0014] The above method separates and recycles the waste circuit board components, and the recycling process has the disadvantages of high energy consumption and easy pollution of the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this embodiment, microwaves and carbon furnaces are used to comprehensively heat and crack waste circuit boards and waste glass fiber reinforced plastics to recover valuable resources. The steps are as follows:

[0034] Use microwave high-frequency radiation: put waste electronic circuit boards into a microwave cracking furnace, and add a suitable catalyst, raise the temperature in the microwave to 500°C-600°C and perform thermal cracking under microwave radiation for 5-6 minutes ;

[0035] Collect thermal cracking distillates and condense them into aromatic organic compounds (liquid oil) at 10°C to 30°C;

[0036] Microwave high-frequency thermal cracking: further smelting the cracked solid products at a temperature of 1300 ° C to 1500 ° C, the function is to separate non-ferrous metals from residues, and set the temperature in the furnace according to the melting point of each non-ferrous metal Temperature, segmented extraction and separation from 500°C to 1500°C;...

Embodiment 2

[0040] In this embodiment, the method for recycling valuable resources of waste glass fiber reinforced plastics and waste circuit boards includes the following process:

[0041] Microwave high-frequency pyrolysis: the waste circuit boards and waste glass fiber reinforced plastics are crushed by a crusher, and then sent to a microwave high-frequency cracking furnace through a screw feeder to raise the temperature to 500 ° C ~ 600 ° C. During the cracking process, 1% ~ 2% is added to the furnace Aluminum oxide is used as a catalyst (the purpose of using the catalyst is to increase the output rate of aromatic organic matter, reduce the reaction process, reduce energy consumption and save costs);

[0042] When the temperature rises to 250°C, the thermosetting material in the furnace begins to depolymerize, and some low-fraction volatiles are dry-distilled out. When the temperature continues to increase, the output of the reaction product increases sharply; when the temperature rise...

Embodiment 3

[0045] Put waste electronic circuit boards and glass fiber reinforced plastic waste into a pulverizer for crushing, then pass through a screw feeder, and then enter a high-frequency microwave oven. 1% to 2% of catalysts such as alumina should be added to the furnace, and the temperature should be raised to 500 ° C ~ At 600°C, the pyrolysis organic components in the furnace are dry-distilled and collected, and the condensation temperature of the heat exchanger is 20°C to 30°C. Most of the distilled components are aromatic hydrocarbon organic compounds. After dry distillation, the solids contain 15% to 20% of metal and 80% to 85% of the residue, and then separated by high-temperature smelting furnace to obtain various relatively pure non-ferrous metals, and the final carbon residue is used as a material for sintered cement.

[0046] Conclusion: (1) Under the action of high frequency of microwave oven, high temperature of hundreds of degrees will be generated in the furnace, which...

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PUM

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Abstract

The invention provides a method for carrying out splitting according to pollution-free microwave radiation of waste glass fiber reinforced plastics and waste circuit boards and recycling aromatic hydrocarbon organic components from a splitting process. The method has the advantages of simple treatment process, no pollution, low cost and high recycling efficiency.

Description

technical field [0001] The invention relates to the technical field of recycling waste electronic and electrical products and industrial waste, in particular to a method for recovering valuable resources from waste glass fiber reinforced plastics and waste electronic circuit boards by using microwave pyrolysis. Background technique [0002] With the rapid development of the economy and the electronic information industry, the replacement of electronic and electrical products is increasing, and the service life of the products is shortened, resulting in a large number of electronic products being discarded. Waste printed circuit boards are a major part of electronic waste, and their recycling has become a global problem that needs to be solved urgently. Discarded circuit boards are different from general solid waste. In addition to precious metals and other valuable metals, they also contain lead, cadmium, mercury, hexavalent chromium, polyvinyl chloride and halogen-containin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00C22B7/00
CPCY02P10/20Y02W30/82
Inventor 宋金有
Owner 宋党记
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