Abstract
Flotation of coal after multistage addition of frother was found to yield coal fractions with significantly lower ash content as compared to the feed. Ignition and combustion characteristics of different coal fractions were evaluated using a differential thermal analyzer (DTA). A correlation between low ash content, low specific gravity, and high reactivity of coal was observed. It is suggested that in the ignition stage, removal of mineral matter enhances reactivity through the physical changes brought about by ash removal. A detailed analysis of pre-ignition kinetics indicated the possible effect of bulk density of coal in terms of resistance to volatile release and effective (available) surface area of coal. In the char combustion stage, mineral matter seems to influence reactivity through catalytic activity of surface concentrations of metal ions, ratio of combustible/non-combustible material, internal pore structure, and surface roughness.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
SME preprint 84–148, SME-AIME Annual Meeting, Los Angeles, CA, February 1984. MMP paper 84–638. Discussion of this paper must be submitted, in duplicate, prior to Jan. 31, 1988.
Rights and permissions
About this article
Cite this article
Moudgil, B.M., Adiga, K.C. & Shah, D.O. Ignition and combustion characteristics of successively floated coal fractions. Mining, Metallurgy & Exploration 4, 223–225 (1987). https://doi.org/10.1007/BF03402697
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF03402697