Journal
ENERGIES
Volume 14, Issue 23, Pages -Publisher
MDPI
DOI: 10.3390/en14238158
Keywords
coal; coking; grindability; Hardgrove index; GrH; HGI
Categories
Funding
- Research Subsidy of the AGH University of Science and Technology for the Faculty of Energy and Fuels [16.16.210.476]
- Faculty of Civil Engineering and Resource Management [16.16.100.215]
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This study investigated the relationship between the Hardgrove grindability index and the physicochemical properties of coal, finding a clear positive correlation with calorific value, smaller positive correlations with moisture content and free swelling index, and a slight negative correlation with sulfur content.
A very important aspect of proper preparation of the coal mixture for the coking process is its appropriate grinding. One of the parameters describing the energy input required for grinding is the Hardgrove index. This research was undertaken to determine the dependence of the Hardgrove grindability index on selected physicochemical properties of coal. The Hardgrove grindability index was determined using the available methods described in the standards, and the dependence on selected parameters was examined. A clear positive correlation with calorific value and smaller (also positive) correlations with moisture content and free swelling index was obtained. A slight negative correlation was also obtained with sulfur content.
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