System and method for treating used electronic product

Abstract

The invention discloses a system and a method for treating a used electronic product. The system comprises a pretreatment unit, a pyrolysis unit, a separation unit, a mixing unit, an oil-gas separation and purification unit and a calcium carbide production unit. The method for treating the used electronic product by adopting the system comprises the following steps: (1) pretreatment: the used electronic product is disassembled and crushed; (2) pyrolysis: a pretreatment product is subjected to pyrolysis, high-temperature oil gas and a carbon-containing solid substance are obtained, the high-temperature oil gas is collected, and the carbon-containing solid substance is discharged; (3) separation: the carbon-containing solid substance is subjected to fine crushing and separation, and pyrolytic carbon is obtained; (4) mixing: the pyrolytic carbon is mixed with a calcium-based raw material; (5) oil-gas separation and purification: the high-temperature oil gas is subjected to separation, noncondensable gas is obtained and treated, and pyrolysis gas is obtained; (6) calcium carbide production: a mixed product is subjected to a reaction in a calcium carbide furnace, and calcium carbide is obtained. According to the system and the method, recovery of the used electronic product and production of calcium carbide are coupled, recycling of the used electronic product is realized, and the production cost of calcium carbide is reduced.

Description

technical field [0001] The invention belongs to the field of solid waste resource treatment, in particular to a system and method for waste electronic product treatment. Background technique [0002] With the rapid development of science and technology, waste electronic products and scraps formed during the processing of electronic products are also increasing day by day. In developed countries such as Japan, the United States, and the European Union, the annual output of electronic waste accounts for 1%, 2-5% and 4% of urban waste respectively, and grows at a rate of 16%-28% every 5 years, which is 3 times the growth rate of urban waste. -5 times. This situation is particularly serious in my country, which not only has a large population, but also is the main place for dumping e-waste in developed countries. Statistics show that 80% of e-waste in the United States is exported to Asia, and 90% of it enters my country. [0003] Domestic and foreign technologies for recyclin...

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Problems solved by technology

[0007] At present, a simple pyrolysis method is usually used to deal with waste electronic products, and a method for recovering metals after pyrolysis is given, but this method ignores the utilization of fuel generated in the pyrolysis process, and does not maximize resource utilization. The solution has high requirements for equipment, and it is difficult to realize industrialization

[0008] As can be seen from the above, there are the following problems in the prior art: the recycling level of non-metallic substances in the treatment of waste electronic products is not enough; the pyrolysis treatment of waste electronic products is mostly used as a pretreatment method, and the subsequent utilization technology of pyrolysis products is lacking; Coke and heat / electricity, high cost of raw materials and high energy consumption; the ash content after combustion by oxythermal method is enriched in calcium carbide products, affecting the quality of calcium carbide products

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