The red mud is a residue obtained from the Bayer process for the alumina production and alumina control (gibbsite) present in this important residue, being the limit loss designed is for values below 3.5%. This study used multivariate statistical (Principal Component) to identify the changes of the flow of the plant during the period 2005/2012 that influenced the increase of loss of gibbsite in the red mud residue. This study was conducted in the seven production lines of Hydro-Alunorte, in Pará, Brazil, designed to produce 6.1 million tons of alumina per year. The results confirmed that when the flow of the plant is reduced, there is an increase in the time of contact with the Bayer liquor in decanters and washers, increasing the loss of gibbsite in the red mud. Considering that reducing the flow is a condition inherent to the operation system of a plant, the study recommends adjustments in the routines to reduce operational losses.
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- Using a Multivariate Statistical in the Identification of Alumina Loss in Red Mud
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