Method and device for sieving plastic from urban household wastes

Abstract

The invention discloses a method and a device for sieving plastic from urban household wastes. The method comprises the steps of conveying the household wastes, magnetic sorting, drying, sieving, crushing, sorting through a pneumatic shaking table, electrostatically sorting, and obtaining waste and old plastic. The device adopted in the method comprises a magnetic sorting device, a drying device,a sieving device, a crushing device, a pneumatic shaking bed sorting device and an electrostatic sorting device which are sequentially connected. According to the method, the steps are performed in amatching manner, thus more than 95% plastic can be sorted from the household wastes, and moreover, the sorted plastic is high in purity.

Description

technical field [0001] The invention belongs to the field of garbage recycling, in particular to the field of plastic recycling, in particular to a method and device for screening plastics from urban domestic garbage. Background technique [0002] With the development of the economy, my country's demand for plastics is increasing year by year, and according to research, the amount of waste plastics that can be recycled from domestic waste is considerable. At present, in terms of waste disposal, waste classification and its reuse can achieve a certain amount of recycling of waste plastics to a certain extent and realize resource reuse. However, in this process, the separation of plastics is not thorough, and the separation rate is low. Effective Resources cannot be fully utilized, and the problem of high dust content in the air during the sorting process has always existed, which affects the efficiency of garbage disposal and air quality, so a new method and device are urgent...

AI Technical Summary

Problems solved by technology

At present, in terms of waste disposal, waste classification and its reuse can achieve a certain amount of recycling of waste plastics to a certain extent and realize resource reuse. However, in this process, the separation of plastics is not thorough, and the separation rate is low. Effective Resources cannot be fully utilized, and the problem of high dust content in the air has always existed during the sorting process, which affects the efficiency of garbage disposal and air quality, so a new method and device are urgently needed to solve these problems

However, because the composition of garbage is very complex, which contains a large number of materials with similar density to plastics, such as paper, wood chips, etc., and plastics are often mixed with them, the efficiency of this simple winnowing method is low, and the sorted Plastics contain a lot of sundries, such as paper, sawdust, leaves, cigarette butts, etc., which cause considerable difficulties for the future recycling of waste plastics

There are also some processes for sorting plastics from domestic waste that use the series connection of two winnowing technologies. Before the second sorting, the light waste that was sorted out in the first time needs to be treated with water and other substances to increase its weight. Differentiate the weight of plastics and paper scraps, so as to achieve the purpose of sorting out a small amount of impurity plastics, but this intermediate process is very easy to cause secondary pollution to water, and in today's scarce water resources, it is also harmful to water resources. a waste of

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