基于两矿法的某进口锰矿浸出效果及其动力学研究OA

The main component of an imported manganese ore is FeMn2O4,the valence of Mn is+3,and it is dis-proportionated into+2 and+4 valence under acidic conditions.However,Mn4+cannot enter the leaching solution directly,and it needs to be reduced to soluble Mn2+by adding a reducing agent.In this paper,the effects of sulfuric acid concentration,pyrite content,reaction temperature and reaction time on manganese leaching rate were investiga-ted by using pyrite as reducing agent,and the leaching kinetics was studied.The results show that the optimum lea-ching conditions are liquid-solid ratio of 5:1,acid concentration of 2 mol/L,pyrite content of 30％,reaction tempera-ture of 90℃and reaction time of 6 h.Under these conditions,the leaching rate of manganese is as high as 96.83％.The liquid-solid unreacted shrinking core model was used to analyze the leaching process.It was found that the reaction rate was controlled by chemical reaction,and the activation energy was 42.232 8 kJ/mol.The research results can provide technical reference for the efficient utilization of manganite spinel.