Mechanism of Dissolution Behavior of the Secondary Alumina

作者：Yang Youjian; Gao Bingliang^*; Wang Zhaowen; Shi Zhongning; Hu Xianwei

来源：Metallurgical and Materials Transactions B-Process Metallurgy and Materials Processing Science, 2013, 44(5): 1296-1303.

DOI：10.1007/s11663-013-9901-1

The study on dissolution of alumina in aluminum electrolyte has never been suspended. The raw materials used in aluminum smelter are made up of primary alumina and secondary alumina. The latter is the by-product of a dry scrubbing system. The differences in dissolution behavior of these two kinds of alumina are studied in this article. A see-through cell was used for observing the dissolution behavior of alumina. It was found that the dissolution rate of the secondary alumina was significantly faster than that of the primary alumina. The effect of possible impurities in the secondary alumina on the dissolution behavior, including carbon dust, hydrogen fluoride (HF), and other fluorides (Na5Al3F14, Na3AlF6, AlF3), was investigated. The carbon dust played an important role in improving the dissolution behavior. However, fluorides and chemisorbed HF have little effect on the dissolution behavior of the secondary alumina.

• 出版日期2013-10
• 单位东北大学