Abstract
To obtain commercial product of required quantitative and qualitative parameters, hard coal must be subjected to a number of processing operations. Preliminary stone removal from run-of-mine is one of them. Methods of such removal, including the method of selective crushing are described. Design solutions for a KOMAG-type device for dry stone removal of run-of-mine are presented. The results of laboratory tests for selective crushing susceptibility of steam coal and coke are presented, and a comparative analysis of the tested types of coal is made. Possibilities of increasing the production of commercial products by using a Bradford drum crusher is analyzed from the economical point of view.
Highlights
The extracted hard coal is a mixture of grains of various sizes and shapes and with a different mineral composition
Stone removal is carried on the surface at the site of mining, the so-called feed preparation station, which is the first step in the hard coal beneficiation process
Stone removal can be carried out by the “dry” method, which uses the selective crushing method, or the “wet” method using the differences in the density of coal and waste rock [20]
Summary
The extracted hard coal is a mixture of grains of various sizes and shapes and with a different mineral composition. Minerals beneficiation is the most important process, in terms of improving the quality parameters of the processed material. The beneficiation process, depending on the grain size of the material (feed), is carried out in specialized machines and devices, including dense liquid separators (e.g., DISA), pulsating water jigs, and flotation machines. Technological and design solutions of these devices are constantly improved to increase their efficiency [4,5,6,7,8,9,10,11,12,13,14,15]
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