Pyrolyzation and debromination method of waste printed circuit board

A circuit board and waste printing technology, which is applied in the field of pyrolysis and debromination of non-metallic components, can solve the problems of unfavorable comprehensive utilization, achieve the effect of improving the effective utilization rate and curbing the formation of harmful components of dioxin

Inactive Publication Date: 2010-09-15
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the above-mentioned circuit board pyrolysis debromination methods, the first three methods have little influence on the composition of solid residues and liquid phase products, and the catalyst or bromine in the latter two methods Remains in the solid phase residue, which is not conducive to further comprehensive utilization

Method used

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  • Pyrolyzation and debromination method of waste printed circuit board
  • Pyrolyzation and debromination method of waste printed circuit board
  • Pyrolyzation and debromination method of waste printed circuit board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Separation of non-metallic objects from waste printed circuit boards

[0026] Sequentially use a hammer crusher, shredder, rotary crusher, and ball mill to crush waste circuit boards into particles smaller than 1mm, use a low-strength magnetic separator to separate ferromagnetic substances, and then separate the broken circuit boards by electrostatic separation The metal in the product except the ferromagnetic substance is the non-metallic separation of the waste printed circuit board, and the resin content is more than 70%.

[0027] 2. Pyrolysis reaction

[0028] Join the non-metallic separator 100g and hexamethylenetetramine 15g of the remaining waste printed circuit board in step 1 in the rotary furnace reactor, the quality of the nonmetallic separator and hexamethylenetetramine of the waste printed circuit board The ratio is 1:0.15, in N 2 N at a flow rate of 20mL / min 2 In the atmosphere, the temperature was raised to 150°C at a heating rate of 2°C / min, cured ...

Embodiment 2

[0032] In the pyrolysis reaction step 2 of this embodiment, 100 g of the non-metallic separator of the waste printed circuit board remaining in step 1 and 1 g of hexamethylenetetramine are added to the rotary furnace reactor, and the non-metallic separator of the waste printed circuit board is The mass ratio of the isolate to hexamethylenetetramine is 1:0.01, and other steps of this step are the same as in Example 1. Other steps are identical with embodiment 1.

Embodiment 3

[0034] In the pyrolysis reaction step 2 of this embodiment, 100 g of the non-metallic separator of the waste printed circuit board remaining in step 1 and 5 g of hexamethylenetetramine are added in the rotary furnace reactor, and the non-metallic separator of the waste printed circuit board is The mass ratio of the isolate to hexamethylenetetramine is 1:0.05, and other steps of this step are the same as in Example 1. Other steps are identical with embodiment 1.

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Abstract

The invention relates to a pyrolyzation and debromination method of a waste printed circuit board. A nonmetal substance containing the main components of epoxy resin and glass fiber is separated from the waste print circuit board, a nitrogen-contained compound which is cheap and easy to obtain is used as a catalyst, pyrolyzation and debromination are carried out in three temperature stages through controlling a pyrolyzation temperature raising procedure, so that bromine in a nonmetal separator of the waste printed circuit board is volatilized and removed in a low molecular bromide gas product way (HBr, CH3Br), the formation of dioxin as an objectionable constituent is effectively avoided, and meanwhile, a liquid product taking phenol derivatives (phenyl hydroxide, australol) as the main components is obtained, and finally, the effective utilization ratio of the nonmetal material in the waste printed circuit board is improved. The invention has the advantages of simple method, easy obtaining of raw materials, no environment pollution, and the like, and can be widely applied to the recycling of the waste printed circuit board.

Description

technical field [0001] The invention belongs to the technical field of destroying solid waste or converting solid waste into useful or harmless things, and in particular relates to the thermal debromination of non-metallic components in waste printed circuit boards. Background technique [0002] The non-metallic components in waste printed circuit boards (PCB) are mainly recovered by physical and chemical methods. Physical recycling is a method that directly uses non-metallic scraps of waste circuit boards as fillers to prepare recycled products, and its commercial value is low. Chemical recovery methods mainly include pyrolysis recovery, solvent recovery and supercritical treatment recovery, that is, the use of chemical methods to decompose PCBs into gas, liquid or coke of small molecular hydrocarbons. Pyrolysis is a thermochemical process in which organic matter is heated in the absence of air to convert it into valuable fuel or chemical raw materials. Pyrolysis technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C08J11/10C07C37/00
CPCY02W30/62Y02W30/82
Inventor 董文生刘春玲刘欣杨二桃王燕
Owner SHAANXI NORMAL UNIV
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