Al2O3 solubility in Na3AlF6-K3AlF6-AlF3-LiF-CaF2-MgF2 molten salts

被引：0

作者：

Zhang W.-G. ^{[1
]}

Shen B. ^{[1
,2
]}

Zhang Z.-Y. ^{[2
]}

Lai Y.-Q. ^{[3
]}

机构：

[1] School of Metallurgy and Environment, Central South University, Changsha

[2] Qinghai Western Hydropower Company Limited, Haidong

[3] School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi'an

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2018年 / 28卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Aluminum electrolysis; Aluminum oxide; Electrolyte; Potassium cryolite; Solubility;

D O I：

10.19476/j.ysxb.1004.0609.2018.03.22

中图分类号：

学科分类号：

摘要：

Abstract: The influences of K3AlF6, LiF and AlF3 contents on Al2O3 solubility were investigated by rotating conindum tablet. The influencing mechanism of melt composition, temperature and superheat on Al2O3 solubility were also discussed. The results show that Al2O3 solubility is affected by K3AlF6, LiF and AlF3 through altering melt composition. Adding K3AlF6 contributes to increase the Al2O3 solubility, while LiF and AlF3 have negative effects on Al2O3 solubility. Under the same melt temperature, the effect of K3AlF6 content is a little greater than that when superheat keeps identical, and with the increase of K3AlF6, the growing rate of Al2O3 solubility are 0.46% and 0.16%, respectively. The increase of LiF reduces the Al2O3 solubility evidently and the largest drop reaches 21.64%. When the temperature keeps identical, the effect of AlF3 content on Al2O3 solubility is minor. But when superheat keeps identical, the effect of AlF3 content is obvious, the largest drop reaches 8.20%. © 2018, Science Press. All right reserved.

引用

页码：618 / 627

页数：9

共 30 条

[1]

Primary aluminum production, (2017)

[2]

Zhang B.-Y., Jiang Y.-H., Guo S., Zhou F.-L., The influence of bauxite resource change in china on layout of world alumina industry, Light Metals, 7, pp. 1-5, (2014)

[3]

Feng N.-X., Peng J.-P., Wang Y.-W., Di Y.-Z., You J., Liao X.-A., Research and application of energy saving technology for aluminum reduction in china, Light Metals 2012., pp. 563-568, (2012)

[4]

Chen F.-Q., Effect of lithium salt and potassium salt on the production of prebake cell, Journal of Materials and Metallurgy, 9, pp. 148-150, (2010)

[5]

Cheng B.-S., Effect of lithium salt content to technical parameters in the aluminum electrolyte system, Gansu Metallurgy, 34, 5, pp. 24-26, (2012)

[6]

Liu D.-X., Influence of the Li rich electrolyte on aluminum reduction process and countermeasures, Light Metals, 2, pp. 30-33, (2014)

[7]

Li M., Bai X., Li Y., Hou W.-Y., Gao Y.-T., Control mechanisms and critical characteristics in dissolution of alumina particles, The Chinese Journal of Nonferrous Metals, 26, 2, pp. 455-464, (2016)

[8]

Grjotheim K., Krohn C., Malinovsky M., Malinovsky K., Thonstad J., Aluminum electrolysis fundamentals of the hall-héroult process, pp. 56-61, (1982)

[9]

Robert E., Olsen J.E., Danek V., Tixhon E., Ostvold T., Gilbert B., Structure and thermodynamics of alkali fluoride-aluminum fluoride-alumina melts: Vapor pressure and Raman spectroscopic studies, Journal of Physics and Chemistry B, 101, 46, pp. 9447-9457, (1997)

[10]

Skybakmoen E., Solheim A., Sterten A., Alumina solubility in molten salt systems of interest for aluminum electrolysis and related phase diagram data, Metallurgical Transactions B, 28, 1, pp. 81-86, (1997)

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