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Recovery of metals and plastics from electronic waste

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Title Recovery of metals and plastics from electronic waste
 
Creator Kumar, Neeraj
Shukla, Pankaj
Sharma, Vinod Praveen
 
Description 94-98
The production of electronic waste is increasing worldwide and the life span of some of the equipments is very short.
This is a significant problem because some of the products including computer and mobile phones contain heavy
metals and other chemicals which are hazardous and are consequently a threat to the environment and human health.
The impact disposal may release toxic substances, viz. lead, cadmium, mercury, tin, copper, chromium and toxic gases.
They may be reaching to the aquifer, soil or atmosphere in the level above than the permissible limit of the regulatory
agencies. The first stage of the process for recovering metals and plastics from electrical/electronic waste involves
dismantling obsolete equipments. Another method of recycling printed circuit boards (c. b.) that has been manually
separated from electrical/electronic waste is smelting and an alternative method is mechanical separation widely used
in the underdeveloped countries. Mechanically separated non-metal fraction of the printed c.b. is rich in hearting
power and can be used in combustion purposes. Lead emitted by the Cathode Ray Tubes (CRTs) is toxic to plant and
animal, long-term exposure can be harmful or even fetal. During metal recovery process from printed circuit boards,
brominated dibenzo dioxin and furans are emitted which contaminate the environment. Heating of the two types of
brominated flame retardant namely polybrominated dibenzo dioxin (PBDD) and tetrabromo bis phenol-A (TBBP-A),
to temperature at 400-800°C in oven or tubes resulted in the production ofpolybrominated dibenzo furans (PBDFs).
A comparative study of different methods used at national and international level for recovering metals and plastic
from electronic waste is discussed in the review article.
 
Date 2009-02-12T08:39:31Z
2009-02-12T08:39:31Z
2008-12
 
Type Article
 
Identifier 0771-7706
http://hdl.handle.net/123456789/3094
 
Language en_US
 
Publisher CSIR
 
Source BVAAP Vol.16(2) [December 2008]