Abstract
The rate of alumina dissolution in cryolitic melts is critical for the management of aluminium production pots. The kinetics of the dissolution reaction depends on the combined effects of physical and chemical characteristics of alumina. The literature mentions several methods to follow the rate of dissolution, with variable degrees of complexity and success. We report a combination of analytical tools to evaluate the dissolution rates of various industrial aluminas in an industrial cryolite bath collected shortly before the anode effect. Batches of powders were sequentially added to an electrochemical cell specifically designed for this test. The dissolution rate was measured electrochemically, and an automatic script was developed to measure the flotation time of the alumina rafts from digital recordings. We correlate the alumina dissolution rate and flotation times, with the initial characteristics of the alumina powder.KeywordsAluminaDissolutionAlumina rafts
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