| Aimed at elimination of environmental pollution caused by waste ferric residue heaping as far as possible, and elimination of destructive damage of soil and groundwater caused by nonferrous metallurgy waste residue, and value-added utilization of iron resource in high acid leaching residue, and recovery of other valued metals, the study of high-purity ferric oxide making from high acid leaching residue was proposed in the paper, using the process of "cure and leaching-purification impurity deep desilication-separate zinc and iron in autoclave". Deep desilication and iron precipitation in autocalve using two oxidants were researched intensively. The results have an important meaning of the application and promotion of the new process.The results of deep desilication show that the scheme of desilication through adsorption by hydrogen ferric oxide is feasible.Through the single-factor experiment,the optimum conditions were chosed as reaction temperature60℃,pH5.5,oxidant amount2mL for200mL purified liquid,reaction time60min,flocculation A dosage0.1g/L.Under the optimum conditions, the content of Si is about lppm and desilication yield is higher than90%;the content of Fe is about30g/L,which can be for making ferrite;the content of Zn is about100g/LFerric oxide sedimenting in autoclave using oxygen and hydrogen peroxide respectively as oxidant all can reach the standard of above YHT5.The ferric oxide sedimenting in autoclave using hydrogen peroxide as oxidant can make low power consumption manganese zinc soft magnetic ferrite close to BM40and high magnetic conductance manganese zinc soft magnetic ferrite close to DN40.Through the single-factor experiment of iron sedimentation using oxygen as oxidant in autoclave, the optimum conditions were chosed as stirring rate800r/min, reaction time3h, reaction temperature210℃,oxygen pressure2.4MPa. Under the optimum conditions,the precipitation rate of Fe can reach92.94%. |
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