Method and system for pyrolyzing and debrominating waste circuit boards

A technology for waste circuit boards and waste circuit boards, which is applied in chemical instruments and methods, solid waste removal, electronic waste recycling, etc. The effect of improving heat transfer efficiency and reducing treatment costs

Pending Publication Date: 2018-04-10
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are two main problems in the traditional pyrolysis treatment process: 1. Because the thermal conductivity of the circuit board is not good, the heat transfer efficiency in the furnace is low, resulting in high energy consumption and low treatment efficiency
2. There are a lot of halogenated compounds in the flame retardant in the circuit board, which will generate more obscuring smoke, elemental bromine, hydrogen bromide, bromophenol and other toxic and harmful substances during the pyrolysis process.
The main disadvantages of this technology are that 1) using supercritical fluid method to treat bromine-containing plastic waste, the operating conditions are high temperature and high pressure, and the energy consumption is large, so it is difficult to realize the application in industry; 2) the reaction process produces a large amount of waste water, resulting in secondary Pollution

Method used

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  • Method and system for pyrolyzing and debrominating waste circuit boards
  • Method and system for pyrolyzing and debrominating waste circuit boards

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] In this embodiment, waste printed circuit boards FR4 are used to carry out pyrolysis and debromination in the rotary kiln 3 pyrolysis process using the above system.

[0077] Such as figure 1 As shown, the collected waste circuit boards are pretreated and entered into the crusher 1 for crushing, so that the particle size is 5mm-10mm. The smaller the circuit board particle size, the more uniform the solid heat carrier and the circuit board are mixed, and the higher the pyrolysis efficiency is. high.

[0078] The broken circuit board and the solid heat carrier heated by the preheating device (such as the heating furnace 9) are quickly mixed evenly in the spiral mixer, and the solid heat carrier adopts iron oxide balls. The equivalent particle size of the iron oxide ball is larger than that of the circuit board to facilitate the separation from the pyrolysis coke in the later stage. The equivalent particle size of the iron oxide ball is 20mm. The heating furnace 9 uses e...

Embodiment 2

[0084] In this embodiment, waste printed circuit boards FR4 are used to carry out pyrolysis and debromination in the rotary kiln 3 pyrolysis process using the above system.

[0085] Such as figure 1 As shown, the collected waste circuit boards are pretreated and entered into the crusher 1 for crushing, so that the particle size is 10mm-15mm. The smaller the circuit board particle size, the more uniform the solid heat carrier and the circuit board are mixed, and the higher the pyrolysis efficiency is. high.

[0086] The broken circuit board and the solid heat carrier heated by the preheating device (such as the heating furnace 9) are quickly mixed evenly in the horizontal mixer, and the solid heat carrier adopts calcium oxide balls. The equivalent particle size of the calcium oxide ball is larger than that of the circuit board to facilitate the separation from the pyrolysis coke in the later stage. The equivalent particle size of the calcium oxide ball is 40mm. The heating fu...

Embodiment 3

[0092] In this embodiment, waste printed circuit boards FR4 are used to carry out pyrolysis and debromination in the rotary kiln 3 pyrolysis process using the above system.

[0093] Such as figure 1 As shown, the collected waste circuit boards are pretreated and entered into the crusher 1 for crushing, so that the particle size is 5-15mm. The smaller the circuit board particle size, the more uniform the solid heat carrier and the circuit board are mixed, and the higher the pyrolysis efficiency high.

[0094] The broken circuit board and the solid heat carrier heated by the preheating device (such as the heating furnace 9) are quickly mixed evenly in the V-shaped mixer, and the solid heat carrier adopts copper oxide balls. The equivalent particle size of the copper oxide ball is larger than that of the circuit board to facilitate the separation from the pyrolysis coke in the later stage. The equivalent particle size of the copper oxide ball is 30mm. The heating furnace 9 uses...

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Abstract

The invention relates to a method for pyrolyzing and debrominating waste circuit boards. The method comprises the following steps: 1) crushing the waste circuit boards; 2) mixing solid thermal carriers with the waste circuit boards; 3) pyrolyzing; 4) using a gas solid separator; and 5) performing quenching separation to obtain pyrolysis gas and pyrolysis oil. The invention further relates to a system for pyrolyzing and debrominating the waste circuit boards. The system comprises a separation tower, a crusher, a mixer, a rotary kiln, a rotary sieve, a gas solid separator, a centrifugal machine,a heating furnace and a collecting tower. According to the method and system for pyrolyzing and debrominating the waste circuit boards, a metal oxide as the solid thermal carriers is fully mixed withthe waste circuit boards, and the metal oxides such as ferric oxide and copper oxide are used to absorb the substances such as Br2 and HBr generated by the pyrolysis reaction, thereby effectively removing the halide in the waste circuit boards, and generating metal bromide to prevent the device corrosion and the influence on tar.

Description

technical field [0001] The invention relates to the field of solid waste treatment, in particular to a method and system for thermal debromination treatment of waste circuit boards. Background technique [0002] Waste circuit board is a kind of solid waste produced by various waste computers, communication equipment, household appliances such as TV sets and refrigerators, as well as obsolete precision electronic instruments and meters. my country is a big country in the production and consumption of electronic appliances. In recent years, the number of waste circuit boards produced by electronic appliances has increased exponentially. On the other hand, as the world's largest circuit board manufacturing country, the waste generated in the production process reaches 30% of the total, which is one of the important sources of discarded circuit boards. [0003] At present, many research institutions at home and abroad have carried out extensive research on the recycling and rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00C10B49/16C10B53/00
CPCC10B49/16C10B53/00B09B3/00B09B5/00B09B3/40Y02W30/82
Inventor 李斌张亚飞陶进峰王江华李因亮王鹏飞贾懿曼吴道洪
Owner SHENWU TECH GRP CO LTD
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