Reduction of lowgrade manganese dioxide ore pelle

Authors: Honglei Zhang Guocai Zhu Hong Yan Yuna Zhao Tiancheng Li Xiujuan Feng

Publish Date: 2013/03/27

Volume: 26, Issue: 2, Pages: 167-172

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Abstract

An investigation on reducing lowgrade manganese dioxide ore pellets was carried out by using wheat stalk as reductant The main impact factors of reduction percent such as particle size biomass/ore ratio heating rate nitrogen flow rate temperature and time in reduction process were discussed The morphology and component of manganese dioxide ore particle at different stages were also analyzed by scanning electron microscopy SEM and energy dispersive Xray spectroscopy EDS The results show the increase of the reduction temperature and time biomass/ore ratio and the decrease of particle size heating rate and nitrogen flow rate can significantly enhance reduction efficiency The reduction kinetic of the manganese ore is controlled by threedimensional mass diffusion of gaseous reductive volatiles passing from the surface to the core of the ore particles The activation energy E and frequency factor A were calculated to be 2415 kJ·mol−1 and 166 min−1 respectively Biomass pyrolysis volatiles adsorbed onto the surface of the ore particle leads to serious variation of the microstructures and chemical composition of the manganese ore particles

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