The mechanism of Bayer process scale formation
Mark Barnes
Broschiertes Buch

The mechanism of Bayer process scale formation

The kinetics and mechanism of sodium aluminosilicate crystallisation in Bayer process scale formation

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During alumina production, sodium aluminosilicate scale formation in process pipes, vessels, and equipment is a major problem. The two most common forms of scale are sodalite and cancrinite. This study was undertaken to gain a greater understanding of the scaling process, particularly the mechanisms, supersaturation, and kinetics of the desilication reactions, which lead to scale precipitation. The equilibrium solubilities of sodalite and cancrinite in synthetic spent Bayer liquor were determined over a broad range of temperatures (90 -220 °C). The growth kinetics of sodalite and cancrinite w...