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Improving the quality of waste-derived char by removing ash

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Title: Improving the quality of waste-derived char by removing ash
Authors: Hwang, I. H. Browse this author
Nakajima, D. Browse this author
Matsuto, T. Browse this author →KAKEN DB
Sugimoto, T. Browse this author
Keywords: Ash removal
automobile shredder residue (ASR)
coal cleaning techniques
municipal solid waste (MSW)
Issue Date: 2008
Publisher: Pergamon
Journal Title: Waste Management
Volume: 28
Issue: 2
Start Page: 424
End Page: 434
Publisher DOI: 10.1016/j.wasman.2006.11.015
PMID: 17317141
Abstract: This study characterized and removed ash from waste-derived char to improve the quality of char as fuel. Municipal solid waste (MSW) and automobile shredder residue (ASR) were carbonized at 450 ℃ and at 500 ℃ respectively in a rotary kiln with a nitrogen atmosphere for 1 h. MSW and ASR char were subjected to sieving and pulverization-sieving to screen incombustibles and the ash-rich fraction, after which float–sink separation, froth floatation, and oil agglomeration were applied to remove ash from the char. The established target quality was less than 30% ash content and more than 20000 kJ/kg heating value. However, the rate of combustibles recovery had to be lowered to produce a good quality of char along with a high heating value. MSW char attained the targeted quality level using froth floatation or oil agglomeration whereas neither separation method was able to make ASR-derived char satisfy the target. Based on the assumption that particle properties of char are determined by the weight ratio of combustibles and ash, the densities of combustibles and ash in char were estimated using the results of float–sink separation, X-ray diffraction (XRD) analysis, and elemental content. To verify the above assumption, an energy dispersive X-ray/scanning electron microscope (EDX/SEM) analyzer was used to observe char particles.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 松藤 敏彦

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