Abstract:
Manganese ore coming from Pringsewu district of Lampung province belongs to
manganiferous ore. Containing approximately 32.27% Mn and 14.87% Fe, this
Pringsewu manganese ore is classified into low grade manganese ore
(Mn<40%). Processing by hydrometallurgy technique has some shortcomings,
and one of them is expensive additional cost for reprocessing used chemical
materials. The objective of this research was to process low grade manganese
ore by using composite pellets followed with pyrometallurgy process. The first
process was started by milling, sieving, stirring, and composite pellet making. The
next process was composite pellet reduction by using hot blast cupola and
induction furnace into pig iron with manganese containing, and this was usually
called as spiegeleisen. Reduction process by using hot blast cupola produced
spiegeleisen with the following compositions: 16.98% Mn; 5.02% C; 75.64% Fe;
0.87% Si; 0.072% P; 0.028% S; while reduction process by using induction
furnace produced spiegeleisen with the following compositions: 9.36% Mn; 4.85%
C; 86.03% Fe; 0.21% Si; 0.01% P; 0.02% S
