System and method for treating waste electronic product

Abstract

The invention discloses a system and method for treating a waste electronic product. The system comprises a pretreatment unit, a separation unit, a mixing unit, a pyrolysis unit, an oil-gas separation and purification unit and a calcium carbide production unit. The method for treating the waste electronic product through the system includes the following steps of 1, pretreatment, wherein the waste electronic product is disassembled and crushed; 2, separation, wherein the pretreated product is finely crushed, sorted and separated to obtain a non-metallic product; 3, mixing, wherein the non-metallic product is mixed with a calcium-based raw material; 4, pyrolysis, wherein the mixed product is pyrolyzed to generate high-temperature oil and gas and solid carbon-containing substances, the high-temperature oil and gas are collected, and the solid carbon-containing substances are discharged; 5, oil-gas separation and purification, wherein the high-temperature oil and gas are separated to obtain noncondensable gas, and the noncondensable gas is treated to obtain pyrolysis gas; 6, calcium carbide production, wherein the solid carbon-containing substances react in a calcium carbide furnace to obtain calcium carbide. Recovery of the waste electronic product and calcium carbide production are coupled, resource recovery of the waste electronic product is achieved, 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...

AI Technical Summary

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

Images