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.
North-western Guinea is home to significant mineral resources (bauxite, par excellence), diamonds and gold, as well as a few indications of useful minerals. Significant deposits of useful minerals have now been identified, some of which are being exploited (e.g. the bauxite deposits of Boké, Fria, Boffa and Télimélé). However, a good number are still foreseeable, given the favorable geological conditions. So, with the prospect of obtaining appreciable and acceptable scientific results, the aim of this work is to study the bauxitic facies and the main geochemical parameters (Al2O3, Fe2O3, TiO2, SiO2 and power) associated with them, among which titanium appears to be the most stable parameter, with a content varying from 1.71 to 4.14% throughout the deposit. Geological work in the study area has revealed the presence of gelomorphic and gravelly bauxites, and has also brought us into contact with certain source rocks (dolerites and cuirasses). Samples processed and analyzed showed alumina content ranging from 37 to over 50%.
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