Method for floating and separating polyvinyl chloride from waste mixed plastics based on calcium carbonate pretreatment

A technology of mixing plastic and polyvinyl chloride, applied in the field of waste plastic recycling, can solve the problems of changing the chemical structure of the plastic surface layer, poor test reproducibility, etc., and achieve the effect of high selective separation, high recovery rate, and guaranteeing the stability of the process effect.

Active Publication Date: 2019-11-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problems of these technologies include the use of more chemical reagents that are not allowed by the environmental inspection department, poor test reproducibility, and changes in the chemical structure of the plastic surface, etc.

Method used

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  • Method for floating and separating polyvinyl chloride from waste mixed plastics based on calcium carbonate pretreatment

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Clean and crush the mixed plastic of PC and PVC, take 10g of plastic particles with a particle size of 3-5mm (the mass ratio of PC:PVC is 1:1), and contain 0.4g / L CaCO at 60°C 3 Magnetic stirring is carried out in 100mL of the aqueous solution, the stirring time is 30min, the rotation speed is 800r / min, and the plastic particles obtained by filtration are subjected to flotation separation. After 3 minutes, PVC was separated by flotation with a purity of 97% and a recovery rate of 100%; PC had a purity of 100% and a recovery rate of 97%.

Embodiment 2

[0034] Wash and crush the mixed plastic containing PVC, PS and ABS, take 6g of plastic particles with a particle size of 3-5mm (the mass ratio of PVC:PS:ABS is 1:1:1), and use 100mL plastic at 40°C Concentration of 2g / L CaCO 3 The aqueous solution is pretreated, the stirring time is about 10min, the speed is 400r / min, and the flotation separation is carried out after filtration and cleaning. The applicable flotation conditions are 15mg / L of terpineol, 700mL / min of aeration, and 3min of flotation time. After flotation separation, the purity of the sinking product PVC is 95.6%, and the recovery rate is 100%, and the floating product is a mixture of ABS and PS.

Embodiment 3

[0036] Clean and crush the mixed plastics containing PVC, ABS, PS, PC and PET, take 10g of plastic particles with a particle size of 3-5mm (mass ratio 1:1:1:1:1), and put them under the condition of 50℃ , with 100mL of CaCO with a concentration of 5g / L 3 The aqueous solution was treated for 10 minutes, and the stirring speed during the treatment was 1000r / min. After filtration and cleaning, flotation separation was carried out. Afterwards, the floating product obtained is a mixture of ABS, PET, PS and PC, and the sinking product is PVC plastic, with a purity of 98.4% and a recovery rate of 100%.

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Abstract

The invention discloses a method for floating and separating polyvinyl chloride from waste mixed plastic based on a calcium carbonate pretreatment. The method comprises the steps that the waste mixedplastic containing PVC plastic is placed into a calcium carbonate solution, pretreatment is carried out at a temperature not lower than 40 DEG C, and the pretreated waste mixed plastic is subjected toa flotation process to achieve the separation between the PVC plastic and other plastic in the waste mixed plastic. According to the method for floating and separating the polyvinyl chloride from thewaste mixed plastic based on the calcium carbonate pretreatment, the pretreatment is carried out through a calcium carbonate solution under a specific temperature condition, so that the difference ofsurface components in the waste mixed plastic can be enlarged; and then through the flotation method, the PVC plastic can be separated from the waste mixed plastic with high selectivity and high recovery rate.

Description

technical field [0001] The invention relates to a method for flotation and separation of polyvinyl chloride from waste mixed plastics based on calcium carbonate pretreatment, and belongs to the technical field of waste plastic recycling. Background technique [0002] The rapid development and extensive use of the plastics industry has led to a sharp increase in the amount of waste plastics. Incineration and landfill are the traditional ways to deal with waste plastics, which not only cause serious environmental pollution, but also cause a lot of waste of plastic resources. Therefore, the research on the recycling of waste plastics has attracted great attention worldwide. The recycling of waste plastics mainly includes three stages: collection, sorting and recycling, and the sorting of plastics is the key and difficult point of the recycling of waste plastics. The sorting technologies of waste plastics mainly include manual sorting, floating-sink sorting, flotation, selecti...

Claims

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Application Information

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IPC IPC(8): B29B17/02
CPCB29B17/02B29B2017/0203B29B2017/0248Y02W30/62
Inventor 王晖张迎霜蒋鸿儒顾帼华符剑刚
Owner CENT SOUTH UNIV
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