Experimental investigation for conversion of hematite to magnetite with high ash Jhama Coal

Sau, D C and Banerjee, A and Kumar, Manoj and Kumar, Rakesh (2015) Experimental investigation for conversion of hematite to magnetite with high ash Jhama Coal. Journal of Metallurgy and Materials Science, 57(2) . pp. 83-91.

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In the present investigation, an attempt has been made to study the simultaneous effects of the major processing variables on the extent of reduction of hematite particles surrounded by coal fines in an externally heated cylindrical steel container, referred to here as the work tube, (diameter 70mm and height 300 mm) placed in a pot furnace. Jhama coal was used as a solid reductant with a size of -100 mesh. The effect of variables such as carbon/Fe O molar ratio of the mixture, pot furnace 2 3 temperature and reduction time were investigated. Hematite powder had a particle size of 27 μm approximately and Jhama coal was sieved in a 100 mesh sized sieve prior to the experiment. The objective was to investigate the degree of reduced magnetite with the final intention of using it in heavy media separation for coal beneficiation. The reduction of Hematite fines (27 μm) was done at temperatures 7000C, 7500C and 8000C in an inert gas atmosphere (preferably Nitrogen or Argon) to study the reduction of hematite powder to magnetite by Jhama coal. The percentage (degree) of reduction of Hematite fines was calculated at 30, 60 and 90 minutes, respectively after the furnace reached the predetermined reduction temperature. The experiments were statistically designed such that the effect of each variable can be quantitatively assessed and compared. At 8000C furnace temperature, a reduction degree of >80% is achieved.

Item Type:Article
Official URL/DOI:http://www.nmlindia.org/7404
Uncontrolled Keywords:Hematie, High ash, Jhama coal, Magnetite, Pot furnace.
Divisions:Material Science and Technology
ID Code:7404
Deposited By:Sahu A K
Deposited On:26 Feb 2016 17:35
Last Modified:26 Feb 2016 17:35
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