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A separation method for mixed plastics

A technology of mixing plastics and separation methods, applied in the field of waste plastic recycling, can solve the problems of increased cost, cumbersome, complicated process steps, etc., and achieve the effects of good feasibility, simple process operation, and high separation efficiency

Active Publication Date: 2019-10-25
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, homogeneous advanced oxidation needs to adjust the pH of the aqueous solution to be acidic, and needs to add a large amount of iron ions to the aqueous solution. The resulting acidic waste liquid containing iron ions needs to be treated before it can be discharged. The process steps are complicated, cumbersome, and increase the cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The polystyrene and polyvinyl chloride mixed plastics are crushed, and 200g of plastic particles with a particle size of less than 1.0mm are taken and added to 200mL of 0.1mol / L ferric sulfate aqueous solution at a stirring rate of 500rpm, and then ammonia solution (by mass Concentration is 30%) adjust pH to be 11, be heated to 80 ℃, after stirring for 60min, filter out loaded with nanometer Fe 2 o 3 Add plastic particles with a concentration of 25% to 200mL hydrogen peroxide aqueous solution, stir for 40min at a stirring rate of 100rpm, filter out plastic particles, and perform flotation after cleaning. The flotation conditions are: terpineol oil 5g / t plastic, After flotation for 10 minutes, the purity of polystyrene and polyvinyl chloride after separation were 95.8% and 99.3%, and the recovery rates were 98.2% and 96.6%, respectively.

Embodiment 2

[0026] Crush polycarbonate and polyvinyl chloride mixed plastics, take 200g of plastic particles with a particle size of 2.0-0.9mm, and add them to 200mL of ferric chloride and ferrous chloride aqueous solution (Fe 2+ : Fe 3+ The ratio is 1:2), the stirring rate is 1000rpm, then add 1mol / L sodium hydroxide solution dropwise to adjust the pH to 10, heat to 90°C, stir for 60min and filter out the nano-Fe loaded 3 o 4 Add plastic particles with a concentration of 600mL to 5% hydrogen peroxide aqueous solution, stir for 5min at a stirring rate of 800rpm, filter out the plastic particles, and perform flotation after cleaning. The flotation conditions are: terpineol oil 40g / t plastic, After 1 min of flotation, the purity of polycarbonate and polyvinyl chloride after separation were 97.2% and 96.4%, and the recovery rates were 95.9% and 97.8%, respectively.

Embodiment 3

[0028] Crush polymethyl methacrylate and polystyrene mixed plastics, take 200g of plastic particles with a particle size of less than 1.5mm, add them to 200mL of water, then add sodium dodecyl sulfonate, sodium phosphate, ferrous nitrate (concentration The ratio is 1:1:4), the stirring rate is 600rpm, heated to 35-45°C, adding sodium carbonate solution, passing air into the solution, reacting for 20min, standing for 100min, and then filtering out the plastic loaded with nano-FeOOH Particles were added to 1200mL of 2% hydrogen peroxide aqueous solution, stirred for 60min at a stirring rate of 100rpm, filtered out plastic particles, and flotation was carried out after cleaning. The flotation conditions were: terpineol oil 12g / t plastic, flotation After 8 minutes, the purity of polymethyl methacrylate and polystyrene after separation were 98.9% and 97.6%, and the recoveries were 96.2% and 98.1%, respectively.

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Abstract

The invention relates to a mixed plastic separation method, and belongs to the technical field of waste plastic recycling. The heterogeneous advanced oxidization technology is adopted for selectivelychanging surface wettability of different plastics, and accordingly, efficient flotation separation of the waste mixed plastics is achieved. An efficient mixed plastic separation technology is provided, the technology is high in raw material adaptability, high in separation efficiency and friendly to the environment, flotation waste water is free of pollution, and a technical support is provided for cyclic utilization of the waste plastic resource.

Description

technical field [0001] The invention relates to a method for separating waste and old mixed plastics, belonging to the technical field of waste and old plastics recycling. Background technique [0002] Plastic, as one of the most commonly used materials, has more and more applications in human's daily life and industrial production. The rapid development of the plastics industry and the massive consumption of plastic products have led to a sharp increase in the amount of waste plastics. The traditional treatment methods of waste plastics are incineration and landfill, which not only cause waste of resources, but also cause serious environmental pollution. Therefore, the reuse of waste plastics is highly valued worldwide. The waste plastic recycling process mainly includes three steps: collection, separation and reprocessing. Due to the chemical incompatibility and differences in physical properties of plastics, it is necessary to effectively separate different plastics in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B17/00B29B17/04B29B17/02
CPCB29B17/00B29B17/02B29B17/0412B29B2017/0248Y02W30/52Y02W30/62
Inventor 王重庆
Owner ZHENGZHOU UNIV