The Resource Experimental study on thermal treatment of used printed wiring boards (PWBS), by Xiangjun Zuo

Experimental study on thermal treatment of used printed wiring boards (PWBS), by Xiangjun Zuo

Label
Experimental study on thermal treatment of used printed wiring boards (PWBS)
Title
Experimental study on thermal treatment of used printed wiring boards (PWBS)
Statement of responsibility
by Xiangjun Zuo
Creator
Author
Subject
Language
eng
Summary
"The availability of cheaper and better electronic products as a result of the rapid innovation in technology in past decades has driven the production of e-waste forward. Printed wiring board (PWB) is a component made of one or more layers of insulating material with electrical conductors. The existing processes of recycling PWBs use pyrometallurgical or hydrometallurgical methods, which generate atmospheric pollution. Green recycling has obvious benefits to decrease the amount of PWBs. Green recycling includes two features, 1) little or zero pollution of toxic gases and heavy metals, and 2) efficient (quick and economical) recycling. The aim of this work is to investigate green thermal treatment of PWB wastes in laboratory scales. For small scale experiments, PWB powders were combusted and pyrolyzed using TG/DTA, and the emitted gases were measured using MS. The suitable combustion conditions: 15 °C/min heating rate, >125 ml/min gas flow rate, above 600 °C top temperature, and the holding time is not important for combustion process; The suitable pyrolysis conditions: 15-20 °C/min, >100 ml/min gas flow rate, above 900 °C top temperature, and longer holding time. In combustion experiments, CaCO3, NaOH, NaHCO3 and Na2CO3 were mixed with PWB powders with a mass ratio of 1:1 to control toxic gas emission like HBr. In pyrolysis experiments, additives such as CaCO3, CaO, Fe2O3, ZSM-5, Y-Zeolite were mixed with PWB powders with mass ratio of 5:1 to control toxic gas emission and enhance the pyrolysis reaction. CaCO3 was the best additive to efficiently control toxic emitted gas during the combustion process, and Fe2O3 was the best choice to control toxic emitted gas and enhance the reaction speed during pyrolysis experiment. For large scale experiments, PWB samples were pyrolyzed to solid, liquid and gas products in a tube furnace. Liquid products were analyzed by FTIR. For pyrolysis of PWB without additives, averagely there were 47% solid products, 20% liquid products and 33% gas products. The yield (47%) of solid products in the tube furnace was far more than the yield (36%) in TG/DTA experiments. The results also showed that pyrolyzing smaller PWB powders produced more solid products"--Abstract, pages iii-iv
Cataloging source
UMR
http://library.link/vocab/creatorDate
1980-
http://library.link/vocab/creatorName
Zuo, Xiangjun
Degree
M.S.
Dissertation year
2010.
Funding information
Funded by National Science Foundation
Granting institution
Missouri University of Science and Technology
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
  • dictionaries
  • bibliography
  • theses
http://library.link/vocab/subjectName
  • Printed circuits
  • Combustion
  • Pyrolysis
  • Green technology
Label
Experimental study on thermal treatment of used printed wiring boards (PWBS), by Xiangjun Zuo
Instantiates
Publication
Note
Vita
Bibliography note
Includes bibliographical references (pages 79-89)
Carrier category
online resource
Carrier category code
cr
Carrier MARC source
rdacarrier.
Content category
text
Content type code
txt
Content type MARC source
rdacontent.
Control code
903650726
Extent
1 online resource (xii, 92 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia.
Media type code
c
Other physical details
illustrations (most colored)
Specific material designation
remote
System control number
(OCoLC)903650726
Label
Experimental study on thermal treatment of used printed wiring boards (PWBS), by Xiangjun Zuo
Publication
Note
Vita
Bibliography note
Includes bibliographical references (pages 79-89)
Carrier category
online resource
Carrier category code
cr
Carrier MARC source
rdacarrier.
Content category
text
Content type code
txt
Content type MARC source
rdacontent.
Control code
903650726
Extent
1 online resource (xii, 92 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia.
Media type code
c
Other physical details
illustrations (most colored)
Specific material designation
remote
System control number
(OCoLC)903650726

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