Jatau, B.S.Amoka, I.S.Fadele, S.I.2023-12-142023-12-142013-03-01America Society for Testing and Material 2002. Annual Book of Standards 2000 V.05, 06, 650P. Adeleke A.O., 1997: Numerical computations for coal blend optimization M.SC. Mathematics Thesis, Jos, Nigeria. Adeleke A.O. and P. Onumanyi 2007, Numerical computations to produce cokoable coal blends at the Ajaokuta steel Plant, Nigeria. Journal of Minerals and Materials Characterization of Engineering Vol. 6 No. 2 PP121-134, 2007. Ayode, J.O. and Oyebande, B.L. 1976. A Geography of Nigerian Development. Heineman Educational Books(Nig.) Ltd, Edited by J.S.Oguntiyinbo, O.O Areola and M.Filani pp71-87. Bujnowska, B., and Collin, G.,1992, “Coal tar pitch for improving coking prpoperties of coal”, In Proc.2nd International cokemaking congress, London,1992. pp.142-146. Cratchley, G.R. and Jones, G.P. 1965. An interpretation of the geology and gravity anomalies of the Benue Valley, Nigeria Oversea Geol.Sury. Geophs. Paper I pp 26. Falconer, J.D. 1911. The geology and geography of Northern Nigeria, Macmallian, London. Jatau B.S., Amoka I.S., and Bola 2009, Petrological and Proximate analysis of Lafia-coal deposit, Nasarawa state, Central Nigeria. Nigerian Mining Journal Vol.9 No.1 pp41-45. Ndaji, F.E., Marshi,Marsh,H.A.1987.Laboratory Scale assessment of the utilization potential of subbituminous Nigerian coals as components of coking blends”.,FuelProcesssing Technology, Vol.17, 131-143. Moitra A.K., Banerjee, N. G. Shrinkhandle K. Y., Sing, K. Raja, K.and Banerjee, S.1972. Studies on coal carbonization in India, 1st edn. Central Fuel Research Institute Publication, Calcutta. Proos, A. 1992. “Future requirements for blast furnace coke quality.”Cokemaking International, Vol..4, 29-30. Raw Material and products specification for foreign government steel companies 1994.1st Edition, Abuja, Nigeria. Skerl, G.E., 1988.”Automatic coal blend optimization for cokemaking”. Iron and steel Engineer, USA, July edn. pp.39-43. Task force on the Maximum utilization of Nigeria coals at the Ajaokuta Steel plant, 1987, Abuja Nigeria. Usaini M.N.S. and Ndanusa I.A.A 2010, Determination of Optimal Conditions for the flotation of Lafia-Obi coal using locally demand reagents. Nigerian Mining Journal Vol. 8 No. 1 pp 11-16 Wills. B.A. 2007, Minerals processing Technology Seven Edition.https://keffi.nsuk.edu.ng/handle/20.500.14448/5645Washability and froth flotation tests on Lafia-Obi Coal deposit Nasarawa State North-Central Nigeria were carried out on samples of the coal deposit obtained from seams 30, 13 and 12 after size reduction using hammer and jaw crush respectively. This is a follow-up research of the proximate analysis conducted with the same samples in the same study area Heavy liquids used for the washability test were carbon tetrachloride CCl4, tannile C6C5 – NH2 nitro benzene C6H5NO3 and Bromoform CHBr3 1.18 to 0.6 micro screened size fractions were adopted for the washability test. 355-600 micro size fractions were used for the trial flotation and +180 to 355 micro size fractions were used for the second trial flotation. From the washability test assuming ash content of 5.7% is acceptable a separating density of 1.6 and a yield of 80% will be obtained. Froth flotation at Ph7 of the coal gave an average ash content of the total float to be 6.64% with the higher ash content reporting in the first float being10.29%. The sulphur, moisture and volatile matter are same as in the raw coal. Froth flotation at Ph9 of the coal gave an average ash content of6.95% with the fine coal reporting first with less ash content of 3.42%. This difference could be probably due to the presence of pyrite which might have been depressed at Ph9. These results support the mediumcoking characteristic of the coal deposit.enWashability, Heavy liquids, Froth flotation, Metallurgical coke or coking coal, upgrading or beneficiation and blending.Article