旋转环盘电极装置在冶金方面的应用-铝冶金中氧化铝溶出电解法研究

更新时间：2012-11-22

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Alumina dissolution in cryolitic electrolytes has been a subject of intensive studies, and its relation to the alumina physical

properties had been attempted through various studies over past decades as reported in the open literature. The findings from

these reported lab studies have been proved to be difficult to relate alumina dissolution rate in industrial operating cells due to

lack of similarities between the two settings. Alcoa has been using a different experimental approach to measure alumina

dissolution rate to monitor ore quality changes for providing necessary information to our smelting operations. This paper

briefly describes the background for alumina dissolution studies, experimental setup and procedures for measuring dissolution

rate. Some comparison results of typical good and bad alumina ores in term of dissolution rate are presented.

Different from all previous studies that used some similar designs of stationary graphite

anode, a rotating disk graphite electrode was developed and used for this study. Use of rotating disk electrode can offer several unique advantages:

1.） increased reproducibility by increasing the sharpness of either limiting current or critical current （peak current）

on site of anode effect and therefore the accuracy of the technique.

2.） Independency of the measured dissolution kinetics and alumina concentration on the stirring condition （molten bath dynamics）, cell size and dissolution vessel

configuration.