An investigation on stability of biomass reduced manganese dioxide ore

Honglei ZHANG 1),Guocai ZHU 2),Hong YAN 1),Yuna ZHAO 2),Fangpu CHEN 2) and Wenjuan WANG 2) 1) College of Life Science and Bio-engineering,Beijing University of Technology,Beijing 100124,China 2) Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 102201,China

摘 要：In this study,how to improve the stability of reduced manganese oxide ore was discussed by investigating reoxidation conditions and kinetics mechanism in the cooling process of manganese dioxide ore reduced by biomass.The effects of the temperature and time,chip size of biomass,raw materials thickness and different additives on stability of the products were determined.The valence variation of manganese in ore and the reoxidation kinetics of reduced products were studied.The results show that decrease of reduction temperature and time,and increase of raw materials thickness and little H2SO4 additive are favorable for the stability of the reduced products.The kinetics mechanism of the reoxidation is controlled by diffusion with dynamic apparent activation energy of E1=25.10 kJ·mol-1,and conformation of manganese in the process is changed from MnO to Mn3O4.

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