Waste electric appliance circuit board energy regeneration innocent treatment system

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 and harmless treatment of waste electrical circuit boards. Background technique [0002] With the development of electronic technology and the upgrading of a large number of household appliances, waste electrical circuit boards have grown at an average annual rate of about 18%, and have become the fastest growing waste in the world today, especially waste circuit boards. Improper handling can 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 boards. Among them, the copper clad laminate is the raw material for the production of printed circuit boards, which is mainly composed of substrate, copper foil, and adhesive; the main materials of the substrate are synthetic resins and reinforcing materials, and the synthetic resins mainly include phenolic resin, epoxy resin, polyte...

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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