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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2001, Vol. 2 Issue (3): 284-288    DOI: 10.1631/jzus.2001.0284
Science & Engineering     
CHARACTERISTICS OF FLUORIDE EMISSION FROM FIVE CLAY MINERALS AS AFFECTED BY TEMPERATURE,HEATING TIME AND ADDITION OF CALCIUM COMPOUNDS
WU Wei-hong, XIE Zheng-miao, XU Jian-ming, LIU Chao
College of Environmental and Resource Science, Zhejiang University, Hangzhou 310029, China
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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.

Key words： fluoride emission      clay minerals      high temperature     
Received: 18 May 2000     
CLC:  X799  
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XIE Zheng-miao
WU Wei-hong
XU Jian-ming
LIU Chao
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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. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2001, 2(3): 284-288.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2001.0284     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2001/V2/I3/284

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