Performed activities and main results

On February 27th G. Mongelli, P. Mameli, G. Cerri, G. Oggiano, H. Ouladmansour and D. Pinna of the IGEA S.P.A. performed the sampling at the Olmedo mine in the Nurra District. During the same day additional samples were collected from an open pit at the Sa Sorega...

After sampling, the bauxite samples and red muds cores were taken to the Earth Sciences laboratories of the Department of Chemical, Physical, Mathematical and Natural Sciences of the University of Sassari. The 16 samples of bauxite (Sardinian, Australian and African),...

Leaching experiments were carried out by varying acid concentrations, liquid-to-solid ratios, hydrogen peroxide addition, time and temperature. The optimized conditions ([H₂SO₄] = 1.6 M, [H₂O2] = 1.6 M; solid/liquid 10%; T = 90 °C; t = 240 min) provided fast...