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An Evaluation of the Coking Characteristics of Polish Coking Coals for Cokemaking with Non-coking Nigerian Coals

Author(s): A.O. Adeleke | R.S. Makan | S.A. Ibitoye

Journal: Petroleum and Coal
ISSN 1337-7027

Volume: 49;
Issue: 1;
Start page: 1;
Date: 2007;
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Keywords: Coal | Coking | Blends | G-value

The proximate analysis and laboratory coking properties of Nigerian Enugu, Okaba, Lafia and Bellview coals A and B imported from Poland were determined. For the Nigerian coals, ash contents (db) of 7.89%, 8.80%., 25.99%, volatile matter (daf) of 54.63%, 64.69%, 31.00%, sulphur (db) of 0.44%., 0.70% 2.34% were determined for Enugu, Okaba and Lafia coals, respectively. For the Polish coals, ash contents (db) of 5.80%, 6.10%, volatile matter (daf) of 31.80%, 31.30%, sulphur (db) of 0.60%, 0.70% were analyzed for Bellview A and B, respectively. Furthermore, for Nigerian coals free swelling index (FSI) of 0,0,6 were determined for Enugu, Okaba and Lafia coals, respectively. For the Polish coals, FSI values of 2.5, 2.5, Gieseler maximum fluidity of 48 ddpm, 38 ddpm and G-coking capacity of 0.97, 0.93 were determined for Bellview A and B, respectively. The Nigerian Enugu and Okaba coals are thus non-caking sub-bituminous coals, while Lafia coal is a medium coking coal with intolerably high ash and sulphur contents. The Bellview coals are medium volatile coking coals of ISO codes 523 and 522, respectively. The relatively high G-value for Bellview A indicates that the coal may be self coking, but it may not accommodate the non-caking Enugu and Okaba coals and the high ash and high sulphur Lafia coals in blends for cokemaking. Blend calculations showed that up to 26.38% of the high ash, high sulphur Lafia coal can blend with 24.98% Bellview A and 48.64% prime coking UK Ogmore coal.
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