The solubility of ZnO and ZnAl2O4 in cryolite melts

被引：14
|
作者：
Dewing, EW
Rolseth, S
Stoen, L
Thonstad, J
机构：
[1] Norwegian Univ Sci & Technol, Inst Ind Electrochem, N-7034 Trondheim, Norway
[2] Fdn Sci & Ind Res, Trondheim, Norway
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE | 1997年 / 28卷 / 06期
关键词：
Material Transaction; Alumina Content; Cryolite; Dissolution Reaction; Zinc Aluminate;
D O I：
10.1007/s11663-997-0065-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The solubilities of ZnO and ZnAl2O4 in cryolite-alumina melts at 1020 degrees C have been measured. ZnAl2O4 is the stable solid phase at Al2O3 contents greater than 1.45 +/- 0.2 wt pet. The results can be represented (in terms of wt pet Zn in solution and in the range 1.2 to 13.6 pet Al2O3) by log (pet Zn) = 0.491 + 1.90 log (pet Al2O3) where (pet Al2O3) includes the alumina formed by the dissolution reaction. The results are discussed in terms of the variation of the activity of alumina with its concentration and are consistent with the dissolution mechanism: 3ZnO + 2AlF(3) = 3ZnF(2) + Al2O3 The activity coefficient of ZnF2 in dilute solution with respect to a pure liquid standard state is 0.14.
引用
收藏
页码：1099 / 1101
页数：3
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