Abstract: Tests on reduction-leaching of Daxin Mine's manganese oxide slime at acidic condition were carried out, with cheap pyrite and bagasse as the reductant respectively. The results show that in proper technical conditions, both methods can obtain a manganese leaching rate higher than 95%. Manganese sulfate and manganese carbonate were prepared by purifying the two pregnant solutions from the above leaching tests, with both satisfying the requirements for qualified industrial products. The study on the leaching kinetics of both processes indicates that the pyrite leaching process is controlled by the chemical reaction on the particle surface; and the bagasse hydrolysis leaching process is controlled jointly by chemical reaction and diffusion in the early period and by diffusion in the late period.

Key words: Manganese oxide slime, Pyrite, Bagasse, Hydrolysis, Reduction leaching, Leaching kinetics