Energy-saving and harmless treatment system for waste electrical circuit boards

Abstract

A waste electric appliance circuit board energy regeneration innocent treatment system comprises a pretreatment device, an alkalization incinerator, a multi-metal and oxide recycling and smoke purifying device, a recycled heat energy generating set and an electrical automatic control device. The pretreatment device is connected with the alkalization incinerator, the alkalization incinerator is connected with the multi-metal and oxide recycling and smoke purifying device and the recycled heat energy generating set, and the electrical automatic control device is connected with the pretreatment device, the alkalization incinerator, the multi-metal and oxide recycling and smoke purifying device and the recycled heat energy generating set. The technological devices are relatively simple, accurate in treatment, low in investment, low in operation power consumption and low in operation cost due to water utilization treatment; by means of the devices, resources can be fully utilized, and secondary pollution is avoided.

Description

technical field [0001] The invention relates to a system for energy-saving and harmless treatment of waste electrical circuit boards. Background technique [0002] With the development of electronic technology, a large number of household appliances have been replaced and upgraded. The waste electrical circuit board has grown at an average annual rate of about 18%, and has become the fastest growing garbage in the world today, especially the waste circuit board. Because of its complex composition, Improper handling will cause irreversible damage to the environment. [0003] Waste circuit boards mainly include waste copper clad laminates (CCL), waste printed circuit boards (PCB), and waste printed circuit board cards. Among them, copper-clad laminates are raw materials for the production of printed circuit boards, mainly composed of substrates, copper foil, and adhesives; the main materials of substrates are synthetic resins and reinforcing materials, and synthetic resins ma...

AI Technical Summary

Problems solved by technology

However, these achievements have affected their popularization and application due to the high energy consumption of fine grinding, high requirements for pollution prevention facilities, and secondary pollution problems.

[0017] Objectively speaking, in recent years, domestic universities and research institutes have carried out a large number of research work on the recycling of waste circuit boards from different angles and methods. Pyrochemical or hydrometallurgical methods for comprehensive purification, as well as other microbial technologies, plasma high-temperature pyrolysis technologies, etc., are generally effective, but looking at the existing recycling technologies and equipment in China, there are Some belong to the pilot test stage and are not suitable for large-scale industrial production; others are mostly small stand-alone production; all of them have high energy consumption, small output (the hourly processing capacity does not exceed 500kg), incomplete separation after crushing, and large fineness range. The efficiency of gravity separation is low, the separation rate of general metals is below 90%, the production cost is high, the labor intensity is high, and the economic benefits are not ideal, which makes the factory unable to carry out industrial production and easily causes secondary pollution

Therefore, at present, most domestic methods still use the most primitive method to deal with waste circuit boards. For parts with precious metals such as circuit boards, cupola incineration or strong acid dissolution is used to remove other components and leave precious metals. This process produces a large amount of waste. "Three wastes", due to the absence or lack of high-demand environmental protection facilities, have considerable harm to the environment and labor, and have not made full use of renewable resources

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