A method for harmless and efficient fire treatment of waste circuit boards

Abstract

Provided is a harmless and efficient method for treating waste circuit boards through a pyrogenic process. By utilizing a powerful tail gas treatment capacity of waste incineration equipment in an urban waste treatment place and a continuous feeding detinning incineration integrated rotary kiln which is uniquely manufactured and is low in price, the harmless and efficient method comprises the steps that tin is unsoldered in a preheating mode, organic matter is incinerated and decomposed, slag ash is smelted through a wet process, tail gas is disposed by a large waste treatment device, and finally ash slag serves as brick making materials. The harmless and efficient method for treating the waste circuit boards through the pyrogenic process has the advantages of making full use of existing equipment, saving in investment, high in value of recovered articles, good in economic benefit, high in treatment efficiency, and free of emission of noxious substance.

Description

technical field [0001] The invention relates to the recycling technology of electronic products, in particular to the harmless treatment technology of discarded circuit boards and electric wires. Background technique [0002] The replacement cycle of waste electrical and electronic products is constantly shortening, and the resulting electronic waste is increasing at a rate of 18% every year, becoming one of the fastest growing wastes in the world. Discarded circuit boards are the most complex components and structures in electronic waste, and are also the most difficult to handle. Waste circuit boards contain resin, glass fiber, common metals and rare and precious metals, etc. If left untreated, randomly stacked or landfilled or improperly disposed of, it will bring great threats to the surrounding environment and waste resources. Therefore, the harmless treatment and recycling of waste circuit boards has become an important topic in the field of resources and environment....

AI Technical Summary

Problems solved by technology

However, the main problems of this kind of method are comprehensively described as follows: First, the dry crushing and sorting cannot solve the problem of powder coating and agglomeration, the separation effect is not good, and the amount of waste residue generated is large (cannot be reduced) and it is difficult to handle; Second, the efficiency of wet separation is high, but the cost and difficulty of treating a large amount of waste water and waste residue are high; third, most of the pyro-incineration uses ordinary water dedusting devices, and a few criminals even use cupolas for incineration, resulting in Fourth, very few enterprises use hazardous waste incineration equipment to incinerate circuit boards (such as Hunan Wanrong), but it is difficult to achieve continuous and balanced production, with high cost and low efficiency; fifth, fluidized bed incineration is used treatment, the problem of difficult exhaust gas treatment cannot be solved

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