Reductive Leaching Of Low Grade Manganese Ore Using Bamboo Saw Dust
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Date
2014-02
Authors
Ismail, Suhaina
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Extraction of manganese (Mn) from low grade manganese ore (LGMO)
through reductive leaching was studied in this research work. The reductive leaching
process was done in acidic medium (H2SO4) and bamboo sawdust (BSD) was used as
reducing agent. Mineral phase characterization on LGMO showed that the ore
consist of phases of pyrolusite, α-quartz and goethite. Meanwhile, the biomass
composition of BSD used in this work contains 38.96% cellulose, 26.95%
hemicellulose and 25.86% lignin. In determination of optimum Mn recovery, design
of experiment through a sequenced response surface method (RSM) was done. It was
observed that the most significant variable on the leaching of LGMO is temperature,
followed by concentration of H2SO4 and mass of BSD. Extraction of Mn above 95%
with low dissolutions of Fe (<30%) and Al (<10%) was achieved at leaching
temperature between the range of 90oC≤T≤110 oC; H2SO4 concentration of
1.5M≤H2SO4≤ 2.5M and BSD mass of 7.5g. The reaction kinetics of this leaching
process was determined, and it was observed to fit the model of 1
1
with Ea of 69.3kJ/mol. The reaction rate for LGMO leaching using
BSD was found to be diffusion through inert layer. Characterization on LGMO leach
residue showed that are acid soluble component were dissolved during the leaching,
with cellulose and hemicellulose in BSD residue were ravelled. Hence, it can be
concluded that bamboo saw dust (BSD) can be used as an alternative reducing agent
in the extraction of Mn from low grade manganese ore.
Description
Keywords
Low Grade Manganese , Bamboo Saw Dust