Method for synchronously removing antimony and bromine from electronic waste flame-retardant plastic and recovering plastic matrix

A technology for electronic waste and flame retardant plastics, applied in the field of resource utilization, can solve problems such as environmental pollution and resource waste, and achieve the effects of reducing environmental pollution, saving energy and reducing environmental pollution, and reducing the utilization of energy resources.

Inactive Publication Date: 2021-08-31
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of environmental pollution and waste of resources caused by improper handling of electronic waste flame-retardant plastics, and proposes an efficient, green, and environmentally friendly method for synchronously removing antimony and bromine and recycling plastic substrates, so that antimony, bromine Bromine can be efficiently removed from the plastic matrix, realizing the regeneration and recycling of flame-retardant plastic matrix

Method used

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  • Method for synchronously removing antimony and bromine from electronic waste flame-retardant plastic and recovering plastic matrix
  • Method for synchronously removing antimony and bromine from electronic waste flame-retardant plastic and recovering plastic matrix
  • Method for synchronously removing antimony and bromine from electronic waste flame-retardant plastic and recovering plastic matrix

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Firstly, the electronic waste flame-retardant plastic HIPS is placed in a crusher for crushing, so that the particle size of the crushed plastic particles is 1-3 cm. The obtained plastic granules were collected and put into a stainless steel-lined crucible, and 100ml of sodium sulfide and sodium hydroxide mixed solution was added into the stainless steel-lined crucible, wherein the concentration of sodium sulfide was 50g / L, and the concentration of sodium hydroxide was 25g / L. Put the stainless-steel-lined crucible into the reaction kettle, open the exhaust pipe, let in nitrogen gas to exhaust the air, seal it, and place it in a heating jacket. Start the power supply of the hydrothermal reactor device, raise the internal temperature of the reactor to 220°C, and then keep the temperature constant, so that the antimony and bromine flame retardants in the flame-retardant plastic in the reactor can fully react with the solute and be leached and removed synchronously. The hol...

Embodiment 2

[0055] First, the electronic waste flame-retardant HIPS plastic is crushed in a crusher, so that the particle size of the crushed plastic particles is 4-5cm. The obtained plastic particles were collected and put into a stainless steel-lined crucible, and 100ml of sodium sulfide and sodium hydroxide mixed solution was added into the stainless steel-lined crucible, wherein the concentration of sodium sulfide was 55g / L, and the concentration of sodium hydroxide was 30g / L. Put the stainless-steel-lined crucible into the reaction kettle, open the exhaust pipe, let in nitrogen gas to exhaust the air, seal it, and place it in a heating jacket. Start the power supply of the hydrothermal reactor device, raise the internal temperature of the reactor to 200°C, and then keep the temperature constant, so that the antimony and bromine flame retardants in the flame-retardant plastic in the reactor can fully react with the solute and be leached and removed synchronously. The holding time is 2...

Embodiment 3- Embodiment 8

[0059] First, the electronic waste flame-retardant HIPS plastic is crushed in a crusher, so that the particle size of the crushed plastic particles is 1-5cm. The obtained plastic particles were collected and put into a stainless steel-lined crucible, and 100ml of a mixture of sodium sulfide and sodium hydroxide was added to the stainless-lined crucible, wherein the concentrations of sodium sulfide and sodium hydroxide were shown in Table 1. Put the stainless-steel-lined crucible into the reaction kettle, open the exhaust pipe, let in nitrogen gas to exhaust the air, seal it, and place it in a heating jacket. Start the power supply of the hydrothermal reactor device, raise the internal temperature of the reactor as shown in Table 1, and then keep the temperature constant. The antimony removal rate and bromine removal rate are shown in Table 1 below. It is difficult to achieve antimony removal rate greater than 85%, and bromine removal rate greater than 90%.

[0060] Table 1 ...

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Abstract

The invention discloses a method for synchronously removing antimony and bromine from electronic waste flame-retardant plastic and recovering a plastic matrix. The method comprises the following steps: crushing the electronic waste flame-retardant plastic, creating a sulfur-alkali reaction atmosphere in a hydrothermal environment, carrying out hydrothermal sulfur-alkali reaction on the crushed flame-retardant plastic in the sulfur-alkali reaction atmosphere, synchronously removing antimony and bromine flame retardants, and recovering to obtain the plastic matrix with small structural performance change. Antimony and bromine flame retardants contained in the flame-retardant plastic are efficiently and synchronously removed, and the plastic matrix capable of being used for mechanical re-granulation is recycled. The method has outstanding advantages in the aspects of environmental pollution reduction and energy resource utilization, and has the characteristics of good removal effect, low operation cost, high resource value, no pollution to the environment and the like.

Description

technical field [0001] The invention belongs to the technical fields of pollutant removal, matrix reuse and resource utilization in electronic waste, and specifically relates to a method for synchronously removing antimony and bromine from electronic waste flame-retardant plastics and recovering the plastic matrix. Background technique [0002] E-waste flame-retardant plastics contain antimony and bromine flame retardants. Improper disposal will cause great harm to human health. At the same time, the existence of antimony and bromine is also the main bottleneck restricting the recycling of e-waste flame-retardant plastics. In addition, a large amount of antimony and bromine-containing electronic waste flame-retardant plastic substrates also caused a waste of resources and energy. The European Union's RoHS2.0 revision directive (EU) 2015 / 863 has restricted the amount of polybrominated biphenyls (PBBS) and polybrominated diphenyl ethers (PBDES) in electronic and electrical equ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/16C08L101/00C08L51/04
CPCC08J11/16C08J2300/30C08J2351/04Y02W30/62
Inventor 詹路许振明赵旭远
Owner SHANGHAI JIAO TONG UNIV
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