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Title: Preparation and characterization of lime-silica solids

Abstract

Silica-enhanced lime sorbents for flue gas desulfurization have been prepared by pozzolanic hydration of Ca(OH){sub 2} with excess SiO{sub 2}. As the hydration proceeded, new particles grew in clear-cut features with regular micropores, consisting of chainlike aggregates. The increase in the specific surface area of the product particles with hydration was closely related to the conversion to calcium silicate. Even after the completion of the pozzolanic reaction, self-hydration of excess SiO{sub 2} continued to make the particles with more clear-cut features but prevent the Brunauer-Emmett-Teller (BET) surface area from further increasing. The mole ratio of Ca/Si in the calcium silicate prepared was independent of its initial mole ratio and converged to 0.9--1.5, depending on the hydration temperature. Pressure hydration at temperatures above 100 C dramatically accelerated the reaction, resulting in a less compact structure composed of smaller primary particles with the ultimate BET surface area unchanged.

Authors:
; ;
Publication Date:
Research Org.:
Chung Ang Univ., Seoul (KR)
OSTI Identifier:
20076075
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:
54 ENVIRONMENTAL SCIENCES; 01 COAL, LIGNITE, AND PEAT; FLUE GAS; DESULFURIZATION; ADSORBENTS; CALCIUM HYDROXIDES; SURFACE AREA; CHEMICAL PREPARATION; HYDRATION; CALCIUM SILICATES

Citation Formats

Jung, G.H., Kim, H., and Kim, S.G. Preparation and characterization of lime-silica solids. United States: N. p., 2000. Web. doi:10.1021/ie990511y.
Jung, G.H., Kim, H., & Kim, S.G. Preparation and characterization of lime-silica solids. United States. doi:10.1021/ie990511y.
Jung, G.H., Kim, H., and Kim, S.G. Mon . "Preparation and characterization of lime-silica solids". United States. doi:10.1021/ie990511y.
@article{osti_20076075,
title = {Preparation and characterization of lime-silica solids},
author = {Jung, G.H. and Kim, H. and Kim, S.G.},
abstractNote = {Silica-enhanced lime sorbents for flue gas desulfurization have been prepared by pozzolanic hydration of Ca(OH){sub 2} with excess SiO{sub 2}. As the hydration proceeded, new particles grew in clear-cut features with regular micropores, consisting of chainlike aggregates. The increase in the specific surface area of the product particles with hydration was closely related to the conversion to calcium silicate. Even after the completion of the pozzolanic reaction, self-hydration of excess SiO{sub 2} continued to make the particles with more clear-cut features but prevent the Brunauer-Emmett-Teller (BET) surface area from further increasing. The mole ratio of Ca/Si in the calcium silicate prepared was independent of its initial mole ratio and converged to 0.9--1.5, depending on the hydration temperature. Pressure hydration at temperatures above 100 C dramatically accelerated the reaction, resulting in a less compact structure composed of smaller primary particles with the ultimate BET surface area unchanged.},
doi = {10.1021/ie990511y},
journal = {Industrial and Engineering Chemistry Research},
issn = {0888-5885},
number = 5,
volume = 39,
place = {United States},
year = {2000},
month = {5}
}