Effects of Stamped Charging on the Strength of Coke from the Weakly Caking Australian Agro-Allied Coal Blend Mixed with Coke Breeze

A.B. Adahama, A.O Adeleke, A.O. Olulana, S.A. Ibitoye

Dept. of Materials Science & Engineering,Obafemi Awolowo University, Ile-Ife. Nigeria..
National Metallurgical Development Centre (NMDC),P.M.B 2116, Jos. Nigeria..

DOI: 10.4236/jmmce.2008.74027                

Abstract

The weakly caking Australian Agro-Allied coal sample mixed with 7% un-reactive coke breeze was subjected to stamped charging prior to carbonization for 22 hours in a 250kg pilot plant to improve the resulting coke strength. The coal was carbonized with a bulk density of 1,000kg/m³ and heating flue temperature of 1,340℃. The screen distribution analysis and the micum tests conducted on the coke gave M₁₀ and M₄₀ of 15.90% and 73.20%, respectively. These results show that the Agro-Allied coke produced is inferior to the coke from a normal top charged counterpart with M₁₀ and M₄₀ indices of 15.40% and 78.20%, respectively and do not satisfy the requirements for the blast furnace ironmaking process. These results thus suggest that the stamped charging coking improvement method designed for high caking, high volatile coals may not be able to improve the strength of coke resulting from a weakly caking, medium volatile coal mixed with coke breeze.

Keywords

coal, caking, stamped, carbonization, coke, micum

Conflicts of Interest

The authors declare no conflicts of interest.

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