A method for assessing the environmental risk of heavy metals in the recycling of e-waste plastics
A technology of electronic waste and environmental risk, applied in the direction of plastic recycling, recycling technology, test sample preparation, etc., can solve the problems of insufficient environmental risk methods of heavy metals, and achieve the effect of improving accuracy and scientificity
Active Publication Date: 2022-03-29
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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Problems solved by technology
[0004] The purpose of the present invention is to provide a method for rapidly assessing the environmental risk of heavy metals in the recycling process of electronic waste plastics, so as to solve the problem that the existing methods for assessing the environmental risks of heavy metals in waste plastics are insufficient
Method used
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Embodiment
[0032] After crushing the plastic sample, add 0.05wt% antioxidant tetrakis [β-(3,5-di-tert-butyl 4-hydroxyphenyl) propionate] pentaerythritol ester and mix well, put the sample into the twin-screw extruder 2 Granulate, then dry and cool the plastic particles and put them into the plastic injection molding machine 3 for injection molding. The temperature setting of each part of the granulator is: 220°C, 220°C, 230°C, 230°C, 230°C, the screw speed is 75r / min; the temperature setting of each part of the injection molding machine is: 200°C, 200°C, 220°C, 220°C °C, 220 °C; the process of granulation and injection molding is repeated 2-3 times and ends, and the cross-sectional surface layer of the injection molding sample bar is observed by SEM.
[0033] Crush the obtained injection molded sample and pass it through a 9.5mm sieve; add a mixture of concentrated sulfuric acid and concentrated nitric acid with a mass ratio of 2:1 into deionized water to make the pH 3.20±0.05 to obtain ...
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Abstract
The invention discloses a method for evaluating the environmental risk of heavy metals in the recycling process of electronic waste plastics. The method of the present invention mainly includes three steps of pretreatment, recycling, and toxic leaching; the present invention simulates the recycling production process of waste plastics in factories through laboratory circulation, and combines the toxicity leaching test to evaluate the plastics in the recycling process due to heavy metals. Environmental risk due to aging and migration and dissolution. The method of the present invention can not only evaluate the possible environmental risk limit after each recycling of plastics, but also take into account the processing conditions in the plastic recycling process to explore the impact of the processing process on the environmental risk of heavy metals, which improves the evaluation to a certain extent. Accuracy of potential hazards of heavy metals in waste plastics.
Description
technical field [0001] The invention relates to the technical field of electronic waste environmental risk prevention and control, in particular to a method for evaluating the environmental risk of heavy metals in the recycling process of electronic waste plastics. Background technique [0002] Plastics are widely used in electronic product casings because of their light weight, easy molding, non-conductivity, excellent cushioning performance, and wear resistance. Foreign countries have conducted surveys and statistics on the material component weight ratio of 21 types of scrapped electronic and electrical equipment, of which plastics account for 2.8%-43.7%. 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 ad...
Claims
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IPC IPC(8): G01N33/44G01N1/34G01N1/28B29B17/00B29B9/06
CPCG01N33/442G01N1/286G01N1/34B29B17/00B29B9/06Y02W30/62
Inventor 白建峰毛少华顾卫华苑文仪王雨刘非凡王健伟黄庆张承龙王景伟
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY