Manganese ore 400 mesh, which was obtained from Sumbawa, West Nusa Tenggara, Indonesia, was used as the starting material. According to the elemental analysis, the main element of this ore is 87.8 wt.% of Mn, while the balance consists of impurities such as Fe, Si, Al, and minor impurities, such as Ti, Co, Zr, V, Zn, Ni, and Mo.Our previous results showed that …
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