Preparation of industrial alumina from a biotite-rich kaolinite (BRK) ore by Cyanex®272

The purification of Al(III) to alumina by bis(2,4,4-trimethylpentyl)phosphinic acid commonly called Cyanex®272 in kerosene diluent from aqueous aluminium leach liquor was investigated. The influences of parameters such as equilibrium pH and extractant concentration on the extent of Al(III) extraction were accordingly examined. After appropriate optimisation, an extraction efficiency of 98.6% Al(III) by 0.25 mol/L Cyanex®272 in kerosene diluent...