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- Title
MATHEMATICAL OPTIMIZATION OF NON-COKING COAL INCLUSION IN COKING BLEND FORMULATIONS.
- Authors
Adeleke, A. A.; Onumanyi, P.; Ibitoye, S. A.
- Abstract
Blend formulation to maximize the inclusion of non-coking coals with the scarce and expensive coking coals is an essential practice in the steel industry. This study demonstrated the use of Microsoft Excel based on a blending model to obtain probable cokeable blends between sample prime coking coals and non-coking Nigerian Lafia-Obi and Okaba coals; having high ash/sulphur and high volatile, respectively. The results obtained showed that optimal binary, ternary and quaternary probable cokeable blends are possible. A cokeable binary blend of 64.51% low volatile, high vitrinite reflecting Western Canada prime coking coal and 35.49% Okaba coal with a cost reduction per ton of $61.56 was obtained. Also, a ternary blend of 74.04% medium volatile prime coking UK Ogmore coal produced an optimal cokeable blend including 19.22 and 6.74 percents of Lafiia-Obi concentrate and Okaba (as-received); respectively with a saving in cost per ton of $39.05. Furthermore, a quaternary blend comprising 40.35, 23.17, 23.17 and 13.30 percents of low volatile Canada, medium volatile Ogmore, Lafiia-Obi concentrate and Okaba (as-received); respectively with a saving in cost per ton of $56.06 was realized. The results obtained showed that vitrinite reflectance, coal beneficiation to reduce ash and sulphur contents and the use of a high volatile coal as a blend component are critical factors in obtaining probable cokeable blends. If the lowest cost binary blend proves cokeable in confirmatory tests, the significant cost reduction of about 29.31% achievable will make cokemaking more economical and sustainable.
- Publication
Petroleum & Coal, 2011, Vol 53, Issue 3, p212
- ISSN
1335-3055
- Publication type
Academic Journal