Recovery of silica and carbon black from rice husk ash disposed from a biomass power plant by precipitation method
Conference proceedings article
ผู้เขียน/บรรณาธิการ
กลุ่มสาขาการวิจัยเชิงกลยุทธ์
ไม่พบข้อมูลที่เกี่ยวข้อง
รายละเอียดสำหรับงานพิมพ์
รายชื่อผู้แต่ง: Thongma B., Chiarakorn S.
ผู้เผยแพร่: IOP Publishing
ปีที่เผยแพร่ (ค.ศ.): 2019
Volume number: 373
Issue number: 1
นอก: 1755-1307
eISSN: 1755-1315
ภาษา: English-Great Britain (EN-GB)
บทคัดย่อ
In Thailand, air pollution caused by rice husk ash (RHA) disposed of biomass power plants has become more serious concerns. Recovery of silica and carbon black from RHA is an attractive solution to solve this problem. This study aims to extract silica and carbon black from RHA, which was burnt in a stoker firing at 800-850 ฐC, by a precipitation method. RHA was dissolved in 2M sodium hydroxide at 105 ฐC for 2-5 h. After that, carbon black was filtered out from sodium silicate solution. The solution was then precipitated by sulfuric acid to produce precipitated powder. The extraction parameters such as types of RHA (fly ash and bottom ash), dissolution time and precipitation time were studied. The precipitated powder was characterized by XRF for elemental analysis, XRD for crystallinity and BET for porosity analysis. The results showed that dissolution for 4 h and precipitation for 1 h could produce precipitated amorphous silica with the purity of 95-99 % SiO2. The yields of silica extracted from bottom ash and fly ash were 85.66 wt% and 72.33 wt%, respectively. The yields of carbon black extracted from bottom ash and fly ash were 14.34 wt% and 27.67 wt%, respectively. The surface area of silica extracted from fly ash (410.72 m2/g) was higher than that of the silica extracted from bottom ash (296.98 m2/g). ฉ 2019 Published under licence by IOP Publishing Ltd.
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