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CLC number: X799
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Received: 2000-05-18
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CHARACTERISTICS OF FLUORIDE EMISSION FROM FIVE CLAY MINERALS AS AFFECTED BY TEMPERATURE,HEATING TIME AND ADDITION OF CALCIUM COMPOUNDS
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WU Wei-hong, XIE Zheng-miao, XU Jian-ming, LIU Chao. CHARACTERISTICS OF FLUORIDE EMISSION FROM FIVE CLAY MINERALS AS AFFECTED BY TEMPERATURE,HEATING TIME AND ADDITION OF CALCIUM COMPOUNDS[J]. Journal of Zhejiang University Science A, 2001, 2(3): 284-288.
@article{title="CHARACTERISTICS OF FLUORIDE EMISSION FROM FIVE CLAY MINERALS AS AFFECTED BY TEMPERATURE,HEATING TIME AND ADDITION OF CALCIUM COMPOUNDS",
author="WU Wei-hong, XIE Zheng-miao, XU Jian-ming, LIU Chao",
journal="Journal of Zhejiang University Science A",
volume="2",
number="3",
pages="284-288",
year="2001",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.2001.0284"
}
%0 Journal Article
%T CHARACTERISTICS OF FLUORIDE EMISSION FROM FIVE CLAY MINERALS AS AFFECTED BY TEMPERATURE,HEATING TIME AND ADDITION OF CALCIUM COMPOUNDS
%A WU Wei-hong
%A XIE Zheng-miao
%A XU Jian-ming
%A LIU Chao
%J Journal of Zhejiang University SCIENCE A
%V 2
%N 3
%P 284-288
%@ 1869-1951
%D 2001
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2001.0284
TY - JOUR
T1 - CHARACTERISTICS OF FLUORIDE EMISSION FROM FIVE CLAY MINERALS AS AFFECTED BY TEMPERATURE,HEATING TIME AND ADDITION OF CALCIUM COMPOUNDS
A1 - WU Wei-hong
A1 - XIE Zheng-miao
A1 - XU Jian-ming
A1 - LIU Chao
J0 - Journal of Zhejiang University Science A
VL - 2
IS - 3
SP - 284
EP - 288
%@ 1869-1951
Y1 - 2001
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.2001.0284
Abstract: Characteristics of fluoride emission from five clay minerals (montmorillonite, kaolinite, vermiculite, geothite, and allophane) as affected by temperature, heating time and addition of calcium compounds were studied. Marked increase of the fluoride emission rate was noticed with increase of temperature. The fluoride release, began at 500 °C-600 °C, and the main bulk of the fluoride emission occurred at the temperature of about 800 °C. The loss of crystalline water was primarily responsible for the increase of fluoride emission. When minerals were heated at 800 °C, the fluoride emission rate from the clay minerals reached the highest after heating for 1 hour. The samples treated by CaO, CaCO3, Ca(OH)2, Ca3(PO4)2, and CaSO4 had 55.45%, 59.58%, 46.45%, 54.31%, 31.25% reduction in the fluoride emission from montmorillonite at the temperature of 800 °C, respectively. CaCO3 had the highest fluoride fixing capacity compared to other calcium compounds.
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