System and method for processing waste electronic products

Abstract

The invention discloses a system and method for processing waste electronic products. The system comprises a preprocessing unit, a separation unit, a pyrolysis unit, a mixing unit, an oil-gas separation and purification unit and a calcium carbide production unit. The method using the system to process the waste electronic products comprises the following steps: 1, preprocessing: disassembling and crushing the waste electronic products; 2, separating: carrying out fine crushing and sorting separation on the above obtained preprocessing product to obtain a nonmetal product; 3, pyrolyzing: pyrolyzing the nonmetal product to generate a high-temperature oil gas and a solid carbon-containing material, collecting the high-temperature oil gas, and discharging the solid carbon-containing material; 4, mixing: mixing the solid carbon-containing material with a calcium-based raw material; 5, separating and purifying the oil gas: separating the high-temperature oil gas to obtain uncondensed gas, and processing the uncondensed gas to obtain pyrolysis gas; and 5, producing calcium carbide: reacting a mixture obtained in step 4 to obtain calcium carbide. The system and the method, which couple the recovery of the waste electronic products with production of calcium carbide, realize recycling of the waste electronic products, and reduce the production cost of calcium carbide.

Description

technical field [0001] The invention belongs to the field of solid waste resource treatment, and in particular relates to a system and method for treating waste electronic products. 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 ...

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Problems solved by technology

[0007] At present, a simple pyrolysis method is usually used to treat waste electronic products, and a method for recovering metals after pyrolysis is given, but this method ignores the utilization of pyrolysis gas, pyrolysis carbon and other products in the pyrolysis process, and has not reached the goal of resource utilization. At the same time, vacuum pyrolysis has high requirements on 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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