Publication: Reductive leaching of local manganese ore
Loading...
Date
2009-05-01
Authors
Loo, Peir Ling
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Reductive leaching of manganese from a low-grade ore (22.07% Mn) from Sungai Temau, Pahang was investigated using hydrochloric acid in the presence and absence of hydrogen peroxide as a reducing agent. Sample characterization by XRD showed the presence of a variety of manganese minerals including Ramsdelite, syn- MnO2, Akhtenskite, syn-epsilon-MnO2, Ramsdelite, syn-gamma-MnO2, Pyrolusite, syn- beta-MnO2. The presence of iron mineral only hematite, syn-Fe2O3 was observed in the sample, as well as silica minerals like Silicon Oxide, alpha-SiO2, Quartz Low, dauphine-twinned-SiO2, Silicon Oxide, Si96O192. The presence of aluminium mineral is Aluminium Oxide, kappa-Al2O3. For tetravalent manganese, it was necessary to use H2O2 as reducing agent. The effects of concentration of hydrochloric acid and hydrogen peroxide, ratio of HCl / H2O2 concentration, leaching temperature as well as reaction time were discussed. The relevant leaching factors were optimized as 2M of HCl, 0.4M of H2O2, solid / liquid ratio of 1:10 and the ratio of 5:1 for HCl / H2O2 at 80°C for 3 hours leaching time using 75µm ground manganese ore.