Method for catalytic pyrolysis of residual nonmetallic powder generated by crushing, separation and recycling of copper from waste circuit board

Abstract

The invention discloses a treatment method for catalytic pyrolysis of residual nonmetallic powder generated by crushing, separation and recycling of copper from a waste circuit board. The method comprises the steps that alkaline waste residues are added into the nonmetallic powder to be mixed evenly to obtain a mixture, then the mixture is subjected to pyrolysis, and accordingly co-pyrolysis of the nonmetallic powder and the alkaline water residues is achieved; and the alkaline water residues contain metallic oxide so as to promote catalysis of pyrolysis products, so that the bromine content in pyrolysis gas in the obtained pyrolysis products is decreased, the content of bromine fixed in pyrolysis residues is increased, and the proportion of light oil with the carbon number being 5-10 in pyrolysis tar is increased. By improving the reaction parameters and conditions of a key co-pyrolysis reaction, a microcosmic displacement mechanism corresponding to the reaction and the like, compared with the prior art, the method can effectively solve the problems that the pyrolysis tar in the pyrolysis products is mainly the heavy tar, and quality is low; and co-processing of the alkaline waste residues and the nonmetallic powder is achieved, and the problem of solid bromine is solved at the same time.

Description

technical field [0001] The invention belongs to the field of waste heat treatment, and more specifically relates to a catalytic pyrolysis method for crushing, separating and recycling copper residual non-metallic powder of waste circuit boards. Background technique [0002] Due to the rapid development of the electronic information industry, the output of electronic waste has increased sharply. According to the estimation of the United Nations Environment Agency, by 2009, the world will generate 40 million tons of electronic waste every year, and the annual growth rate is 16-28%. As an extremely important part of electronic waste, waste printed circuit boards have complex components, among which copper-based metal components account for about 30wt.%, and resin and reinforcing materials-based non-metallic components account for 30wt.% and 40wt.%, respectively. %. In recent years, the potential recycling value of waste circuit boards and the frequent occurrence of high pollut...

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Problems solved by technology

Chinese invention patent (publication number CN105713641A) discloses a device and method for preparing pyrolysis oil by pyrolysis and catalytic debromination of brominated flame-retardant waste plastics. The method adopts a two-step debromination process, combining pyrolysis process and catalytic debromination The process is separated, the process is complex, the energy consumption of multi-step heating operation is high, and the operation cost is increased, and the catalyst described in this method is a commercial catalyst such as HZSM-5, HY type molecular sieve, MCM-41 or activated alumina loaded with iron and nickel elements. Complicated preparation and high cost

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