Reduction of Iron Ore with Non Coking Coal
K M K Sinha1, T.Sharma2, D D Haldar3
1K M K Sinha, Central Institute of Mining and Fuel Research, Dhanbad, India.
2T.Sharma,  Indian School of Mines Dhanbad India.
3D D Haldar,  Central Institute of Mining and Fuel Research, Dhanbad, India.
Manuscript received on January 25, 2014. | Revised Manuscript received on February 13, 2014. | Manuscript published on February 28, 2014. | PP: 30-33  | Volume-3, Issue-3, February 2014. | Retrieval Number:  C2530023314/2013©BEIESP

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Abstract: During the past century, many efforts were made to develop processes for producing iron for steel making without the use of coke. This becomes vital where country like India has limited reserve of coking coal. Coke making is extremely problematic from environmental point of view. The reduction of iron ore with non coking coal or gas below the melting point of the iron produced is classified as Direct Reduction process and product referred to as Direct Reduced Iron (DRI) .The iron making reactions in iron oxide plus carbon involve the disappearance of two solid phases (iron oxide and carbon) and formation of two phases ( metallic iron and gases).The location of the regions where the production of DRI is concentrated is determined by two factors : the availability of cheap natural gas or non coking coal plus the availability of high quality iron bearing raw material ( 65% Fe content or more). In the present investigation an attempt has been made to study the direct reduction behaviour of iron ore fines with non-coking coal fines .For this purpose the effect of reduction time ,temperature and Fe2O3 : C ratio on degree of reduction has been studied. It is observed that degree of reduction increases with increase in Fe2O3 : C ratio, temperature and time. The value of activation energy in the temperature range 1173-1323 K is 203.2 KJ, mole.
Keywords: Degree of reduction, Fe2O3. C ratio, Activation energy.