Sustainable Mining and Metallurgy

To oxidize Fe²⁺in Ga and Ge leaching solution to Fe³⁺, industrial oxidants such as sodium persulfate, manganese ore powder and hydrogen peroxide were used for oxidation. The effects of oxidant addition, reaction temperature and reaction time on the oxidation rate of Fe²⁺in Ga and Ge leaching solution were investigated respectively. The results show that the mass concentration of Fe²⁺in Ga and Ge leaching solution oxidized by industrial oxidants sodium persulfate, manganese ore powder and hydrogen peroxide is ≤0.03g/L, which can meet the production control standard of less than 0.05g/L, and the oxidation rate of Fe²⁺is more than 99.75%. When manganese ore powder is used as oxidant, the oxidized solution cannot be separated during re extraction. The cost of using industrial grade hydrogen peroxide as oxidant is the lowest. According to the actual situation of industrial production and the comprehensive consideration of production cost, it is more appropriate to select industrial hydrogen peroxide as the oxidant. The optimal oxidation process conditions are: rotational speed of 500r/min, hydrogen peroxide addition amount of theoretical chemical reaction molar ratio of 4.0, reaction temperature of 45℃, and reaction time of 20min. Under these conditions, the oxidation rate of Fe²⁺in Ga and Ge leaching solution reached 99.82%. In industrial applications, the corresponding safety storage devices required on site and the safe use specifications shall be implemented, so as to ensure production safety.