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Method for sorting waste plastics

A sorting technology for waste plastics, applied in chemical instruments and methods, solid separation, wet separation, etc., can solve problems such as pollution and surface property changes, and achieve the effect of high industrialization, simple operation, and easy operation

Inactive Publication Date: 2013-09-11
四川长虹格润环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the difference in density between the same type of plastics can be used to sort plastics with different bromine contents in plastics by controlling the density of the sorting medium; however, since the surface of waste plastics in waste household appliances is generally polluted, the surface Properties may have changed and differences in buoyancy from density differences alone may not be as significant as separation from differences in surface properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Break 200-300kg of waste high-impact polystyrene plastics to be sorted into particles with a similar size and shape, with a particle size of ≤1cm 2 For plastic flakes, prepare 5-6 tons of NaCl solution with a density of 1.030 in the sorting tank, add 10-15 kg of alkyl sulfonate, stir and mix well to make the plastic fully infiltrated, let it stand, and separate the upper and lower layers plastic. 5 groups of samples were randomly selected from the separated upper layer plastic, dried (80°C, 2h), and then injection molded to make samples, and the bromine content was determined by energy dispersive X-ray spectrometer (Jiangsu Tianrui Instrument Co., Ltd.). Test, the test results are shown in Table 1. The solution in the plastic sorting pool can be used for plastic sorting repeatedly, only need to supplement the density sorting medium and flotation sizing agent in time.

[0020] The bromine content of the HIPS plastic of table 1 embodiment 1 sorting

[0021] Te...

Embodiment 2

[0029] Break 200-300kg of waste ABS plastics to be sorted into particles with a similar size and shape, with a particle size of ≤1cm 2 Plastic flakes, prepare 5-6 tons of Na with a density of 1.035 in the sorting tank 2 SO 4 solution, add 10-15kg of lignosulfonate, stir and mix well to fully infiltrate the plastic, let it stand, and separate the upper and lower plastics. Randomly select 5 groups of samples from the separated upper layer plastic, dry (85°C, 2h), and injection mold to make samples, then use energy dispersive X-ray spectrometer (Jiangsu Tianrui Instrument Co., Ltd.) to test the bromine content. The test results are shown in Table 3.

[0030] The bromine content of the ABS plastic of table 3 embodiment 3 sorting

[0031] Testing frequency Bromine content (ppm) First group 258.3 Second Group 297.1 The third group 275.7 Fourth group 254.5

[0032] Fourth group 239.3

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Abstract

The invention relates to the field of waste plastic sorting, particularly to a method for sorting waste plastics, which combines density sorting and floatation. According to the method, density sorting and floatation are combined, wherein floatation enlarges the floatability differences of plastics with different components, compensates the defects of a method only adopting density sorting, and improves the sorting accuracy and efficiency. The method is simple to operate and high in sorting accuracy and efficiency.

Description

technical field [0001] The invention relates to the field of sorting waste plastics, in particular to a sorting method for waste plastics. Background technique [0002] The European Union passed the WEEE directive and the RoHS directive in 2003, stipulating that from July 1, 2006, lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, and polybrominated biphenyls contained in new electronic and electrical equipment placed on the EU market Harmful substances such as phenylene ether must be within a limited range, and these substances are mostly present in various plastics. Most of these substances are caused by the addition of plastic additives such as flame retardants, tougheners, and reinforcing agents during the plastic modification process; Density difference between plastics. Therefore, the difference in density between the same type of plastics can be used to sort plastics with different bromine contents in plastics by controlling the density of the so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00
Inventor 李中良江先洪郅慧唐广李兵
Owner 四川长虹格润环保科技股份有限公司
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