Characterization and its implication on beneficiation of low grade iron ore by gravity separation

Kumar, Vinod and Jadhav, G N and Khosla, N K and Chattoraj, U S and Singh, Ratnakar and Bhagat, R P and Nayak, B and Mohanta, M K and Bhattacharyya, K K and Mehrotra, S P (2007) Characterization and its implication on beneficiation of low grade iron ore by gravity separation. In: Advanced Gravity Separation, Aug 30 - Sept 1, 2007, NML Jamshedpur.



Studies were undertaken on low grade iron ore sample from Noamundi iron ore mines. The objective of this study was to examine the possibility of the physical beneficiation of low grade iron ore sample by physical methods for the blast furnace route of iron production. The present investigation relies on petrography and ore mineralogical characterization, ore textures (primary, secondary, metamorphic), liberation characters and its impact on the mineral beneficiation methods to produce quality concentrate. The geological characters, alteration mineralogy, morphometric variation, ore microscopy (using model microscope with transmitted and reflected light) and thereby understanding the genesis has given proper insight into the occurrence of various minerals. In addition to this, representative samples were employed for detailed investigation by using XRD, SEM-EDS and cathodoluminescence (CL) studies for confirmation of major as well as minor ore minerals and associated gangue minerals. Investigations suggest that lateritic iron ore samples obtained from the study area are composed of hematite (two generations), goethite (two generations) and limonitic material (younger generation) in association with major gangue minerals such as clay minerals (kaolinite, illite), bauxitic minerals(gibbsite, boehmite and diaspore), cryptocrystalline silica(japer, chert) and crystalline quartz as well as apatite and collophane. Fair liberation obtained below 74 micron size. It was interesting to find that inspite of the complex mineralogy of iron ore, beneficiation results using gravity separation like multi gravity separator (MGS), particularly in finer size ranges was encouraging. The result of ore-gangue mineralogical studies were found quite useful in evaluating the separation efficacy of gravity separation process. The process mineralogical data corroborated well with beneficiation results.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:Iron Ore, Characterisation, Beneficiation, Gravity separation.
Divisions:Mineral Processing
ID Code:1340
Deposited By:Dr. A K Sahu
Deposited On:29 Jul 2010 10:30
Last Modified:12 Dec 2011 15:39
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