Method for removing heavy metals from electronic waste outer shell PS plastic

A technology for electronic waste and heavy metals, which is applied in the field of removing heavy metals in PS plastics of electronic waste shells, can solve the problems of high content of harmful substances, waste of land resources, environmental pollution, etc. less time effect

Inactive Publication Date: 2019-01-22
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, waste plastics as garbage landfills occupy a large area of ​​land and waste land resources, and because plastics themselves contain toxic and harmful substances such as heavy metals and flame retardants, long-term landfills in the soil will enter the soil and water sources with the garbage leachate. Causes environmental pollution, so plastic recycling has become the main

Method used

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  • Method for removing heavy metals from electronic waste outer shell PS plastic
  • Method for removing heavy metals from electronic waste outer shell PS plastic
  • Method for removing heavy metals from electronic waste outer shell PS plastic

Examples

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Example Embodiment

[0028] Example

[0029] The PS plastic sample was crushed and put into a closed reaction tank 4, as shown in Table 2, a mixed acid mixed by concentrated nitric acid and 40wt% tetrafluoroboric acid in volume ratio was added to obtain solution a; and then to solution a Add 30wt% hydrogen peroxide solution and soak for half an hour, and heat to dissolve. After the reaction, the solution is cooled, and after solid-liquid separation, the valuable heavy metals in the dissolved solution are recovered, and the heavy metal content in the dissolved solution and the mass of the separated plastic sample are measured to calculate the recovery rate.

[0030] Table 2. Example operating conditions

[0031]

[0032] The detection process of this embodiment is as follows:

[0033] Use aqua regia (HCl: HNO 3 =3:1) Digest in a 100ml long-necked Erlenmeyer flask for 2h, heat the digestion, add distilled water and heat slightly to re-dissolve. Dilute the digestion solution to a 50ml volumetric flask, and...

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Abstract

The invention discloses a method for removing heavy metals from an electronic waste outer shell PS plastic. The method mainly comprises three steps of pretreatment, soaking and heating, wherein a hydrogen peroxide-containing mixed acid solution (formed by mixing concentrated nitric acid and tetrafluoroboric acid) is heated to dissolve the plastic additive attached to the waste plastic so as to remove heavy metals from the PS plastic, such that the separation of heavy metals Pb, Cd, Cr and Sb from the plastic is achieved, and the heavy metal content in the waste plastic is reduced. With the method of the present invention, the heavy metals in the PS plastic can be effectively removed, the maximum removal efficiency can reach 95%, the removal efficiency is high, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of waste recycling, in particular to a method for removing heavy metals from PS plastics in electronic waste shells. Background technique [0002] The development trend of thinner, lighter and smaller electronic products has led to a large amount of plastics being used to replace traditional components. Foreign surveys and statistics on the weight ratio of materials for 21 types of scrapped electronic and electrical equipment, among which plastics account for 2.8%-43.7%, iron accounts for 45.9%-51.7%, aluminum accounts for 1.3%-9.3%, and circuit boards account for 0.5%- 9.4%. According to statistics, in 2016, the global e-waste output reached 4.47×10 7 t, the per capita amounted to 6.1kg, an increase of 5% compared with the per capita amount in 2014, and it is expected that the total amount will reach 5.22×10 in 2021 7 t. In order to meet the needs of different users, it is necessary to add a certain amo...

Claims

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Application Information

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IPC IPC(8): B29B17/02
CPCB29B17/02B29B2017/0268B29B2017/0293Y02W30/62
Inventor 白建峰毛少华顾卫华黄庆苑文仪赵静张承龙王景伟
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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