Resource recovery processing method of waste circuit board

A waste circuit board, resource recycling technology, applied in the direction of electronic waste recycling, recycling technology, solid waste removal, etc., can solve the problems of not realizing effective recycling, achieve continuous industrial processing, avoid dioxin generation, reduce The effect of generation of harmful gas

Inactive Publication Date: 2020-12-29
GUANGZHOU WEIGANG ENVIRONMENT TECH CO LTD
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  • Abstract
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Problems solved by technology

However, this process only recovers certain metals in some circuit boards, and other value-added products (such as bromine recovery) in circuit boards have not been effectively recovered

Method used

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  • Resource recovery processing method of waste circuit board

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Embodiment Construction

[0033] Below, the present invention will be further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, on the premise of not conflicting, the various embodiments described below or the technical features can be combined arbitrarily to form new embodiments. .

[0034] like figure 1 A resource recovery processing method for waste circuit boards shown includes the following steps:

[0035] (1) Crushing the entire waste circuit board into small pieces with a diameter of 0.5 to 1mm through a crusher;

[0036] (2) The fragmented circuit board obtained in step (1) is mixed together with additives by a mixer, and the additives include calcium carbonate and calcium oxide, wherein the mass ratio of the additive to the circuit board is 1.3;

[0037] (3) Add the mixture of step (2) into the pyrolysis furnace, and perform anaerobic pyrolysis treatment at a temperature of 600° C. to obtain pyrolysis solid products and pyro...

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Abstract

The invention discloses a resource recovery processing method of a waste circuit board. The resource recovery processing method comprises the following steps of crushing the waste circuit board into particles, mixing the particles with an additive, and carrying out anaerobic pyrolysis treatment to obtain pyrolysis gas and a pyrolysis solid product; screening the pyrolysis solid product to obtain calcium bromide, calcium carbonate, calcium oxide, carbon powder, glass cloth, copper foil and the like; adding water into the calcium bromide, the calcium carbonate, the calcium oxide and the carbon powder, dissolving and filtering the mixture to obtain a calcium bromide aqueous solution and calcium carbonate-calcium hydroxide-carbon powder; evaporating the calcium bromide aqueous solution to obtain a calcium bromide product; drying and screening the calcium carbonate-calcium hydroxide-carbon powder to obtain a carbon powder product and the calcium carbonate and the calcium hydroxide; inorganic bromine in pyrolysis gas generated by catalytic cracking of the thermal gas is absorbed by calcium oxide, then dissolved, filtered, evaporated and concentrated, bromine in the pyrolysis gas is recycled, the pyrolysis gas is combusted after absorption by calcium oxide, and smoke generated by combustion and fusion casting is treated to reach the standard and then discharged. According to the method, the waste circuit board can be recycled, dioxin is prevented from being generated, the recovery rate is high, and industrial application is facilitated.

Description

technical field [0001] The invention relates to a resource recovery and utilization technology for waste circuit boards, in particular to a resource recovery treatment method for waste circuit boards. Background technique [0002] With the rapid development of the electronic information industry, the replacement speed of electronic products is gradually accelerating, and the electronic waste is also increasing rapidly. A huge amount of electronic waste has brought a huge threat to the global ecological environment and has become a new environmental problem that plagues global sustainable development. As the main component of electronic waste, the recycling of waste circuit boards is the basis and difficulty for the recycling and reuse of electronic waste. Waste circuit boards are mainly composed of organic reinforced resin, glass fiber, copper foil and electronic components, which contain a large amount of valuable metals (such as copper, iron, aluminum, tin, lead, etc.), a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00C22B7/00C01F11/34C01B32/05
CPCB09B5/00C22B7/003C01F11/34C01B32/05B09B3/40Y02W30/82Y02P10/20
Inventor 彭李赖喜锐蔡珠华王京华王志成
Owner GUANGZHOU WEIGANG ENVIRONMENT TECH CO LTD
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