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Journal of Zhejiang University SCIENCE A 2001 Vol.2 No.3 P.284~288

http://doi.org/10.1631/jzus.2001.0284


CHARACTERISTICS OF FLUORIDE EMISSION FROM FIVE CLAY MINERALS AS AFFECTED BY TEMPERATURE,HEATING TIME AND ADDITION OF CALCIUM COMPOUNDS


Author(s):  WU Wei-hong, XIE Zheng-miao, XU Jian-ming, LIU Chao

Affiliation(s):  College of Environmental and Resource Science, Zhejiang University, Hangzhou 310029, China

Corresponding email(s): 

Key Words:  fluoride emission, clay minerals, high temperature


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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.

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author="WU Wei-hong, XIE Zheng-miao, XU Jian-ming, LIU Chao",
journal="Journal of Zhejiang University Science A",
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pages="284~288",
year="2001",
publisher="Zhejiang University Press & Springer",
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%A WU Wei-hong
%A XIE Zheng-miao
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%A LIU Chao
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A1 - XIE Zheng-miao
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A1 - LIU Chao
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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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Reference

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