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Calcium-based sorbents for flue gas desulfurization

Chiang, Ray-Kuang

Abstract Details

1995, Doctor of Philosophy, Case Western Reserve University, Chemistry.
A literature survey of the known calcium silicates was carried out. Eight of these silicates were made or purchased and their ability to take up SO 2 was examined. The calcium silicate hydrate C-S-H, when in a porous form, was shown to take up SO 2 well. A sorbent composed largely of such C-S-H was prepared by vigorously agitating high water-to-solids slurries of Ca(OH) 2 and diatomite, perlite or pumice at moderate temperatures. A related sorbent composed of porous C-S-H and Ca(OH) 2 in which the Ca(OH) 2 was embedded in the C-S-H was also prepared. This sorbent was made by agitating at a moderate temperature a high water-to-solids slurry of Ca(OH) 2 and an amount of fumed silica sufficient to react with only part of the Ca(OH) 2 . Another related sorbent composed largely of porous C-S-H, Ca(OH) 2 and the aluminate phase AFm was made by vigorously agitating a high water-to-solids slurry of type I portland cement at a moderate temperature. Still another related sorbent composed largely of porous C-S-H and a hydrotalcite-like phase was made by vigorously agitating a high water-to-solids slurry of ground granulated blast furnace slag at a moderate temperature. In the latter three sorbents, the Ca(OH) 2 , the Ca(O H) 2 and AFm, and the hydrotalcite-like phase respectively all contribute to the activity of the sorbents. All four sorbents show excellent SO 2 uptake and Ca utilization values compared to those of the fly ash-Ca(OH) 2 sorbent and those of a reference Ca(OH) 2 . Limits are placed on the temperature ranges and vigor of agitation ranges that can be used in the preparation of these four sorbents by competing reactions. The reactions leading to these sorbents are heterogeneous and complex. Some suggestions as to the nature of these reactions based in part on studies of model compounds are offered
Malcolm Kenney (Advisor)
157 p.

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Citations

  • Chiang, R.-K. (1995). Calcium-based sorbents for flue gas desulfurization [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1062008694

    APA Style (7th edition)

  • Chiang, Ray-Kuang. Calcium-based sorbents for flue gas desulfurization. 1995. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1062008694.

    MLA Style (8th edition)

  • Chiang, Ray-Kuang. "Calcium-based sorbents for flue gas desulfurization." Doctoral dissertation, Case Western Reserve University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=case1062008694

    Chicago Manual of Style (17th edition)