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28卷    第3期    总第228期    2018年3月

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文章编号:1004-0609(2018)-03-0618-10
Na3AlF6-K3AlF6-AlF3-LiF-CaF2-MgF2熔体中Al2O3的溶解度
方 钊1,程伍丹1,辛鹏飞2,田忠良2,周 亮3,张文根2,沈 冰3,张正英3,赖延清2

(1. 西安建筑科技大学 冶金工程学院,西安 710055; 2. 中南大学 冶金与环境学院,长沙 410083; 3. 青海西部水电有限公司,海东 810800)

摘 要: 采用旋转刚玉片-氮氧分析法研究中熔体中K3AlF6、LiF和AlF3含量对其Al2O3溶解度的影响,探讨熔体物相组成、温度及过热度对Al2O3溶解度的影响机制。结果表明:K3AlF6、LiF及AlF3通过影响熔体物相组成对Al2O3溶解度产生影响;K3AlF6的添加有助于提高熔体Al2O3溶解度,但LiF和AlF3的添加会对熔体Al2O3溶解度产生不利影响。在相同熔体温度条件下,与过热度相比较,K3AlF6对Al2O3溶解度的影响较大,且Al2O3溶解度随K3AlF6含量的增加而增加,且增加幅度分别为0.46%和0.16%;LiF含量的增加会使熔体Al2O3溶解度显著减低,降幅最高可达21.64%。在相同温度下,AlF3对熔体Al2O3溶解度影响较小;但在相同过热度条件下,AlF3含量的增加将明显降低Al2O3的溶解度,降幅最高可达8.20%。

 

关键字: 铝电解;钾冰晶石;电解质;溶解度;氧化铝

Al2O3 solubility in Na3AlF6-K3AlF6-AlF3-LiF-CaF2-MgF2 molten salts
FANG Zhao1, CHENG Wu-dan1, XIN Peng-fei2, TIAN Zhong-liang2, ZHOU Liang3, ZHANG Wen-gen2, SHEN Bing3, ZHANG Zheng-ying3, LAI Yan-qing2

1. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China; 2. School of Metallurgy and Environment, Central South University, Changsha 410083, China; 3. Qinghai Western Hydropower Company Limited, Haidong 810800, China

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%.

 

Key words: aluminum electrolysis; potassium cryolite; electrolyte; solubility; aluminum oxide

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

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

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