Method for removing metal elements in recycled plastic bottle flakes

Abstract

The invention belongs to the technical field of regenerated plastics, and particularly relates to a method for removing metal elements in recycled plastic bottle flakes. The method comprises the following steps that plastic bottles are sorted and crushed to obtain plastic bottle flakes; the plastic bottle flakes are subjected to primary separation through a magnetic separation mechanism; the plastic bottle flakes obtained after primary separation pass through a pipeline provided with a metal separator, the plastic bottle flakes containing metal elements are separated out, the plastic bottle flakes are fed into a pulverizer to be pulverized, and then the metal elements and plastic powder are thoroughly separated out through a high-voltage electrostatic sorting machine; according to the removing method provided by the invention, the complexity of metal elements contained in the plastic bottles in the prior art is fully considered, and a plurality of complementary removing modes are adopted, so that the thoroughness of removing the metal elements in the plastic bottle flakes is ensured, the situation that the metal elements are contained in the recycled plastic bottle flakes to influence the operation stability of subsequent production equipment is avoided, and the influence on the quality of a recycled plastic product is avoided.

Description

technical field [0001] The invention belongs to the technical field of recycled plastics, in particular to a method for removing metal elements in recycled plastic bottle flakes. Background technique [0002] Plastic is one of the great inventions of human beings, but it has also become a headache source of garbage and caused harm to the environment because it is difficult to degrade. In fact, waste plastics are not garbage, and waste can be turned into treasure through environmental protection treatment. Plastic bottles are a widely used plastic product. In the prior art, most plastic bottles use polyester (PET), polyethylene (PE), polypropylene (PP) as raw materials, add corresponding functional materials, after high temperature heating, blow molding, extrusion blowing or blow molding through plastic molds. Injection molding, therefore, most waste plastic bottles have great utilization value, such as being used as packaging materials, daily necessities, industrial suppli...

AI Technical Summary

Problems solved by technology

That is to say, the recycling of existing plastic bottles needs to be crushed. Although it has been cleaned, there will still be metals mixed in the plastic bottle flakes. The existence of these metals has a great impact on the screw and melt filter. Research and development Through the dismantling and analysis of the used melt filter, it was found that a lot of metal debris squeezed by the screw was embedded in the outer layer of the filter element, and a large amount of metal powder was accumulated on the inner mesh of the filter element. Metal powder cannot be removed during the calcination cleaning process. The presence of metal causes increased wear of the screw, resulting in a reduction in the service life of the screw and melt filter, which in turn increases production costs. In addition, recycled plastic mixed with metal will It will also affect the quality of the product, for example, the return of PET bottles will affect the spinning effect

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