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

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第8期    总第113期    2008年8月

[PDF全文下载]        

    

文章编号:1004-0609(2008)08-1550-05
真空低价氟化铝歧化分解制备铝
李秋霞1, 2,陈为亮2,戴永年2

(1. 云南师范大学 化学化工学院,昆明 650092;
2. 昆明理工大学 真空冶金国家工程实验室,昆明 650093
)

摘 要:  

利用物质吉布斯自由焓函数法,讨论不同压力下低价氟化铝生成及分解的热力学条件。结果表明:系统压力为100 kPa时,在1941.76 K以上才能生成低价氟化铝;而当系统压力降低到100~10 Pa时,在1 486.32~ 1 373.28 K 能生成低价氟化铝。同时,当系统压力小于300 Pa时在1 673 K下用氧化铝、氟化铝与还原剂碳在真空炉内实验,验证了理论研究结果,得到纯度为93.77%的金属铝;以焦碳作还原剂,铝土矿为原料在1 723 K进行了实验,得到纯度为95.13%的金属铝。

 

关键词: 铝;真空冶金;歧化反应;低价氟化物;制备

Preparation of aluminum by disproportion of sub-fluoride in vacuum
LI Qiu-xia1, 2, CHEN Wei-liang2, DAI Yong-nian2

1. School of Chemistry and Chemical Engineering ,Yunnan Normal University, Kunming 650092, China;
2. National Engineering Laboratory of Vacuum Metallurgy, Kunming University of Science and Technology,Kunming 650093, China

Abstract:Thermodynamics process and experiment of aluminum extracting from bauxite and Al2O3, were studied. The temperature, at which alumina, aluminum fluoride and carbon react to form aluminum sub-fluoride at different pressures, was evaluated with “Substance Gibbs’ Free Energy Functional Determinant” method. The results show that the reaction temperature can be considerable declined in vacuum, such as the temperature dropped to 1 486.32−1 373.28 K in the pressure range from 100 Pa to 10 Pa, but the temperature of the reaction needed is more than 1 941.76 K under 100 kPa. The metal aluminum with the purity of 93.77% is obtained by the experiment alumina, aluminum fluoride and carbon in a vacuum furnace when the system pressure is less than 300 Pa at 1 673 K; the aluminum metal with the purity of 95.13% is also gotten at 1 723 K by using coke for reducing bauxite.

 

Key words: aluminum; vacuum metallurgy; disproportion; sub-fluoride; preparation

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

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

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com