SynthesisofMgAl2O4PowderinKCI-LiCl-KFSystemMoltenSalt

被引：0

作者：

KE Changming GAN Lin School of Materials and Metallurgy Wuhan University of Science and TechnologyWuhan China ^{[430081
]}

机构：

来源：

China's Refractories | 2011年 / 20卷 / 02期

关键词：

Magnesium aluminate spinel; Molten salt synthesis; Potassium chloride; Lithium chloride; Potassium fluoride;

D O I：

暂无

中图分类号：

TQ175.1 [基础理论];

学科分类号：

0805 ; 080502 ;

摘要：

Molten salt synthesis of MgAl2O4 powder from industrial alumina and light calcined MgO in KCl, LiCl, and KCl-LiCl media, and the influence of KF at 500-1 000 ℃ were investigated. Synthesized powders were characterized by means of XRD, laser particle analyzer, and SEM, and the synthesis mechanism of MgAl2O4 was discussed as well. The results show that (1) the molten salt composite (KCl-LiCl) is more favorable for the synthesis of MgAl2O4 than single molten salt (LiCl or KCl), and LiCl is more favorable than KCl; (2) KF can accelerate the formation of MgAl2O4 and decrease its forming temperature; (3) synthesis of MgAl2O4 powder in the molten salts without KF is controlled by "template-growth" mechanism, but in the molten salts with KF, it is controlled by "template-growth" and "dissolution-precipitation" mechanism.

引用

页码：16 / 20

页数：5

共 7 条

[1] 熔盐法合成晶体的研究现状与进展 [J].

李月明 ;

黄丹 ;

廖润华 ;

王进松 .

陶瓷学报, 2008, (02) :164-169

[2] 直接氯化法测定LiCl熔盐体系相图的研究及LiCl-KCl-LiF三元相图的制作 [J].

张英珊 ;

赵敏寿 ;

唐定骧 ;

李平 .

化学学报, 1990, (07) :644-647

[3] Template formation of magnesium aluminate (MgAl2O4) spinel microplatelets in molten salt [J].

Jayaseelan, Daniel Doni ;

Zhang, Shaowei ;

Hashimoto, Shinobu ;

Lee, William Edward .

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2007, 27 (16) :4745-4749

[4]

Recycling of aluminum – effect of fluoride additions on the salt viscosity and on the alumina dissolution[J] . Jorge Alberto Soares Tenorio,Marcelo Carboneri Carboni,Denise Crocce Romano Espinosa.Journal of Light Metals . 2001 (3)

[5]

Structures of oxyfluoroaluminates in molten cryolite-alumina mixtures investigated by DFT-based calculations[J] . Gérard S. Picard,Frédéric C. Bouyer,Michel Leroy,Yves Bertaud,S. Bouvet.Journal of Molecular Structure: THEOCHEM . 1996

[6]

Viscosity measurements of molten LiCl in the temperature range 886–1275 K[J] . M. Wakao,K. Minami,A. Nagashima.International Journal of Thermophysics . 1991 (2)

[7]

II. A potentiometric study of alumina solubility and the influence of complexing by fluoride ions in LiCl-KCl[J] . D. Inman,J. C. Legey,R. Spencer.Journal of Applied Electrochemistry . 1978 (3)

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