skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Preparation of active absorbent for dry-type flue gas desulfurization from calcium oxide, coal fly ash, and gypsum

Abstract

As compared to a commercial absorbent prepared from Ca(OH){sub 2}, gypsum (CaSO{sub 4}) and coal fly ash, an absorbent prepared by use of CaO in place of Ca(OH){sub 2}, exhibited a higher activity for dry-type flue gas desulfurization. The order of the addition of the raw materials in the slaking procedure has an effect on the activity of the resulting absorbent. The activity of the absorbent increased further upon hydrothermal treatment following the kneading procedure. The period of hydrothermal treatment was reduced to 3 h to attain the activity which exceeds 20% of the activity of the commercial absorbent which requires an optimum hydrothermal treatment period of 10 h. The activity enhancement by use of CaO is considered to result from exothermic heat of slaking CaO. At a high temperature, the reaction of CaO with a SiO{sub 2} component included in the coal fly ash facilitates the formation of calcium silicate. The formation of calcium silicate was suppressed by the existence of CaSO{sub 4} in the slaking procedure.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Hokkaido Univ., Sapporo (JP)
OSTI Identifier:
20076081
Resource Type:
Journal Article
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 39; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0888-5885
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; ADSORBENTS; FLUE GAS; DESULFURIZATION; CHEMICAL PREPARATION; WASTE PRODUCT UTILIZATION; CALCIUM OXIDES; FLY ASH; GYPSUM; SORPTIVE PROPERTIES; CALCIUM SILICATES

Citation Formats

Ishizuka, Tomohiro, Tsuchiai, Hiroaki, Murayama, Takeshi, Tanaka, Tsunehiro, and Hattori, Hideshi. Preparation of active absorbent for dry-type flue gas desulfurization from calcium oxide, coal fly ash, and gypsum. United States: N. p., 2000. Web. doi:10.1021/ie990699l.
Ishizuka, Tomohiro, Tsuchiai, Hiroaki, Murayama, Takeshi, Tanaka, Tsunehiro, & Hattori, Hideshi. Preparation of active absorbent for dry-type flue gas desulfurization from calcium oxide, coal fly ash, and gypsum. United States. doi:10.1021/ie990699l.
Ishizuka, Tomohiro, Tsuchiai, Hiroaki, Murayama, Takeshi, Tanaka, Tsunehiro, and Hattori, Hideshi. Mon . "Preparation of active absorbent for dry-type flue gas desulfurization from calcium oxide, coal fly ash, and gypsum". United States. doi:10.1021/ie990699l.
@article{osti_20076081,
title = {Preparation of active absorbent for dry-type flue gas desulfurization from calcium oxide, coal fly ash, and gypsum},
author = {Ishizuka, Tomohiro and Tsuchiai, Hiroaki and Murayama, Takeshi and Tanaka, Tsunehiro and Hattori, Hideshi},
abstractNote = {As compared to a commercial absorbent prepared from Ca(OH){sub 2}, gypsum (CaSO{sub 4}) and coal fly ash, an absorbent prepared by use of CaO in place of Ca(OH){sub 2}, exhibited a higher activity for dry-type flue gas desulfurization. The order of the addition of the raw materials in the slaking procedure has an effect on the activity of the resulting absorbent. The activity of the absorbent increased further upon hydrothermal treatment following the kneading procedure. The period of hydrothermal treatment was reduced to 3 h to attain the activity which exceeds 20% of the activity of the commercial absorbent which requires an optimum hydrothermal treatment period of 10 h. The activity enhancement by use of CaO is considered to result from exothermic heat of slaking CaO. At a high temperature, the reaction of CaO with a SiO{sub 2} component included in the coal fly ash facilitates the formation of calcium silicate. The formation of calcium silicate was suppressed by the existence of CaSO{sub 4} in the slaking procedure.},
doi = {10.1021/ie990699l},
journal = {Industrial and Engineering Chemistry Research},
issn = {0888-5885},
number = 5,
volume = 39,
place = {United States},
year = {2000},
month = {5}
}