Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第10卷    第2期    总第35期    2000年4月

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文章编号:1004-0609(2000)02-0253-05
等温与非等温过程中AlF3·3H2O的热分解行为
罗永勤1,嵇  鹰1,徐德龙1,赵江平1,周龙宝2,贾国瑞2

(1. 西安建筑科技大学材料工程系,西安710055; 2. 白银氟化盐有限公司,白银 730901)

摘 要: 在不同的等温与非等温条件下,对AlF3·3H2O进行了热重法(TG)实验,得出不同等温温度时三水氟化铝干基氟含量w(F)/%、湿基水含量w(H2O)/%与等温时间或不同升温速率下等温加热温度的关系式。求出了不同加热过程中氟化铝产品特定品质指标(w(F)/%≥61.0,w(H2O) / %<0.50)下的特征操作参数及其相互关系。结果表明,升温速率越大,越有利于AlF3·3H2O的脱水,而对其水解脱氟具有相对的抑制作用;提高等温温度,有利于AlF3·3H2O的脱水而不利于保氟。适当选择不同加热过程中的操作参数及其控制范围,能满足三水氟化铝的脱水和保氟要求。

 

关键词: 三水氟化铝;热分解;脱水

Thermal decomposition behavior of AlF3·3H2O during isothermal and non-isothermal processes
LUO Yong-qin1, JI Ying1, XU De-long1, ZHAO Jiang-ping1, ZHOU Long-bao2, JIA Guo-rui2

1. Department of Materials Engineering, Xi'an University of Arch and Technology, Xi'an 710055, P.R.China;
2. Baiyin Fluoride Trade Co. LTD., Baiyin 730901, P.R.China

Abstract:By using TG measurement, the thermal decomposition behavior of AlF3·3H2O under isothermal and non-isothermal conditions was studied.The relationships of fluorine content in moisture-free basis, w(F), the water content in moisture basis, w(H2O), with the time elapsed under isothermal condition or with the temperature were obtained. For the aluminum fluoride quality specifications (w(F)≥61.0%, w(H2O)<0.50%), the characteristic operation parameters and the relationships between them during different heating processes were derived. The results indicated that greater heating rate is beneficial to dehydration of hydrolytic defluorination; higher degree of isothermal temperature results in more efficient dehydration and more deterrent to preservation of fluorine. Choosing optimum parameters and controlling scope properly during different heating processes, the requirement of dehydration of AlF3·3H2O and preservation of fluorine can be met.

 

Key words: AlF3·3H2O; thermal decomposition; dehydration

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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