Abstract
Two Nigerian coals, Lafia-Obi and Chikila were blended in the mass ratio of 70:30 with imported American and Polish coking coals. Proximate analysis, free swelling index, Ruhr dilatometer and Gieseler plastometer were used in assessing the coking qualities of both the single coals and the blends. The results show that the blends are lower in moisture and ash contents; higher in volatile matter and fixed carbon than the single Nigerian coals. The rheological parameters revealed superiority in thermo-plastic properties of the blends over the unblended local coals. Lafia-Obi/Foreign coals blends possess lower ash and better rheological properties compared to Chikila/Foreign coal composites which have high ash and poor rheological properties. These together suggest that amongst the two Nigerian coals, Lafia-Obi is superior for blending with the foreign ones in metallurgical coke production.
Highlights
The importance of coal in the energy mix of Nigeria and the entire world cannot be underestimated
This paper reports the blending and quality assessment of some Nigerian coals with American and Polish coking coals
A reduction in moisture and ash contents of the blends compared to the single Nigerian coals was observed
Summary
The importance of coal in the energy mix of Nigeria and the entire world cannot be underestimated. Coal was first discovered in Nigeria near Udi, by the Mineral Survey of Southern Nigeria in 1909 and its belt spans through a considerable part of the country [1]. The actual production commenced in 1916 with 24 000 tons for that year and recorded a cumulative output of 22.9 million tons by 1967 when production ceased as a result of the Nigerian Civil War [2]. The only exploited coal deposits are those of Okaba, Onyeama, Okpara and Okwukpa which are mainly used for combustion purposes [3].
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