Mineralogy, liberation and leaching characteristics of iron oxide phases in an Indian diaspore sample

作     者：Danda Srinivas RAO Swagat S.RATH Nilima DASH Swagatika MOHANTY Surendra K.BISWAL Danda Srinivas RAO;Swagat S. RATH;Nilima DASH;Swagatika MOHANTY;Surendra K. BISWAL

作者机构：Council of Scientific and Industrial Research Institute of Minerals and Materials Technology 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2018年第28卷第8期

页      面：1640-1651页

核心收录：

学科分类：080602[工学-钢铁冶金] 08[工学] 0806[工学-冶金工程] 

基　　金：Institute of Minerals and Materials Technology Central Mechanical Engineering Research Institute, Council of Scientific and Industrial Research 

主　　题：diaspore liberation mineralogy leaching magnetic separation 

摘      要：The removal of iron from an Indian diaspore sample was studied using magnetic separation and leaching techniques aided by an in-depth mineralogical characterization study involving quantitative mineralogical evaluation by scanning electron microscope（QEMSCAN）, electron probe micro-analyzer（EPMA） and X-ray diffraction（XRD）. The characterization studies indicate that extremely fine-sized hematite grains are associated with several other mineral phases in a complex manner with around 60% of the hematite not liberated even below the size of 38 μm limiting the scope of physical separation processes to remove the iron. Wet high intensity magnetic separation（WHIMS） studies reveal that only 49% of iron can be removed. Further, leaching studies using oxalic acid suggest that around 76% of the iron can be removed under conditions such as a solid to liquid ratio of 0.05：1, a temperature of 90 ℃ a time period of 120 min and an acid concentration of 1 mol/L. The dissolution of iron in oxalic acid is found to be controlled by chemical reaction and the activation energy is calculated as 35.15 k J/mol.