In the hydrometallurgy process of extracting vanadium and nickel products from oil-fired fly ash, a large amount of unburned carbon remains as a by-product. Because of insufficient knowledge of the physical and chemical properties and related applications of the unburned carbon, the residue has been disposed to landfill or incinerated. In order to explore the utilization of unburned carbon, this preliminary study analyzed its morphology, particle size distribution, specific surface area, pore size distribution, density and chemical composition. The results indicate that the chemical composition is 73-91 percent carbon, 5-19 percent ash, 2.5-11.5 percent volatile substances, and 0.7-1.9 percent water, it consists of porous spherical particles and some crumbled particles with particle sizes mainly in the range 1-100 mu m, the specific surface area is 16-33 m~2/g, the pore size ranges between 0.02 and 10 mu m, the real density is about 2.05-2.16 g/cm~3, the apparent density about 0.15 g/cm~3 and it can be characterized as a puffy, readily wind-blown powder.
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