Extraction of Gallium from Brown Corundum Dust by Roasting—Acid Leaching Process

Brown corundum dust is a solid waste produced during the preparation of brown with bauxite as raw material. The has relatively high gallium content; therefore, it great value to recover from this kind dust. In paper, range analysis and characterization methods, including XRD, XRF, SEM-EDS, EPMA, were used determine occurrence gallium. It was found that mainly present in potassium-rich phase, wrapped by amorphous silicate phase. Roasting activation followed an acid leaching process proposed extract An investigation carried out on effects roasting temperature, time, additive dosage recovery evolution phase composition results show sodium carbonate better than calcium oxide. After at 1073 K for 40 min 0.5 (mass ratio dust), changed completely consist silicate, aluminosilicate, potassium aluminosilicate. case, around 93% Ga could be recovered roasted through H2SO4 (4.6 mol/L) 90 min. described well kinetic equation k3t = 1/(1 − α)1/3 1, apparent energy 16.81 kJ/mol, suggesting rate limited transfer agent across contacting interface particles.