Good alumina production using the Bayer process depends on the regularity of the alumina dissolution parameters, as failure to control these factors leads to a drop in alumina yield. This work has enabled us to identify and propose solutions to the anomalies linked to alumina dissolution. An analysis of the dissolution parameters (temperature, liquor concentration, residence time and saturation rate) shows that the alumina yield from January to December was irregular. This fluctuation in alumina yield remains the same for all the parameters studied. Chemical analysis was used to provide results for certain parameters. These included spectral analysis, pH meter analysis and methrom analysis of samples taken from the etching plant. These analyses showed the different behaviours of the concentration of the liquor and the content of the different bauxite constituents. An analysis of the graphs shows that the parameters vary according to the plant’s instructions. All the results obtained show the need to regulate the alumina dissolution parameters. Better management of these factors will help to improve alumina yield.
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