Abstract: Rice husk ash (RHA), a solid waste from biomass power plant was used as a raw material to synthesize Na-A and Na-X zeolites. In fact, high silica content inside this material opens a possibility to become a potential zeolite precursor. In this study, a medium particle of RHA has been reused to prepare zeolite with high purity. After segregated by mechanical sieving, the medium particle fraction of RHA was subjected to alkali fusion treatment followed by dissolution and then residue separation to produce clear silicate supernatant as the silica source for preparing the low-silica zeolites. High purity of Na-A and Na-X zeolites were prepared using hydrothermal treatment by optimizing the process condition, curing time, hydrothermal temperature and Si/Al molar ratio in the reaction mixture.

• Publication Date: 05-Jan-2014
• DOI: 10.15224/978-981-07-8859-9-53
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Abstract: Disposal treatments of printed circuit board (PCB) waste recently seem to be improper since they all produce a secondary pollutions such as acidification of the soil and heavy metal leached into ground water from landfill and toxicant gasses generates from incineration and material combustion. At present the disposal treatment processes for nonmetallic fraction from PCB waste that have been separated after precious metal separation process are only combustion, landfill and material reused. The most important point is that this nonmetallic fraction from PCB waste can be recovered. Hence, this is a challenge to expose a further separation of materials and materials recovery. From the environmental friendly viewpoint, the only solution to reduce PCB waste problem sustainably is to address the waste material with a proper material recycling technology. The purpose of this study is to determine the suitability of using pyrolysis based recycling as well as to demonstrate its development to b

• Publication Date: 05-Jan-2014
• DOI: 10.15224/978-981-07-8859-9-62
• Views: 0
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