Abstract
We conducted a study into concentration of Donetsk coal with varying degrees of coalification – anthracite and grade G – by the method of oil aggregation. We determined the character of impact of the following factors on the results of oil aggregation of coal: the ash content of original coal, pulp agitation duration, pulp density, consumption and type of reagent-binder. The research demonstrated a possibility of effective preparation of finely- and thinly dispersed Donetsk coal the size of 0–0.1; 0–1(2) mm and ash content from 10–15 % to 65–70 % by the method of oil aggregation. In this case, it was established that with an increase in the ash content of original coal, the process of oil aggregation displays a capacity of self-leveling. By reducing the speed of aggregation, it is possible to attain practically stable technological results over the entire examined range of ash content of original coal – from 10–15 % to 65–70 %. Obtained results substantiate the possibility of employing the process of oil aggregation for the re-preparation of waste, in particular, waste of flotation and gravitation separation of coal preparation
Highlights
Modern advanced mechanized techniques of coal mining predetermine content of finely dispersed fractions the size of 0–1mm in ordinary coal at the level of 3.2–40 %
Results revealed that at concentration of coal in slurry of 11.1 % and consumption of oil 12.5 %, the ash content can be reduced from 32 % to 2.8 %, ash content in waste amounts to 93.0 %
By conducting research into effect of the ash content of original coal on the results of oil aggregation, it was established that at an increase in the ash content from 10–15 % to 65–70 %, aggregation rate decreases by times
Summary
Modern advanced mechanized techniques of coal mining predetermine content of finely dispersed fractions the size of 0–1mm in ordinary coal at the level of 3.2–40 %. Industrial testing showed high efficiency of preparation of coal the size of 0–0.15 (0.2) mm, including ultra-thin grade of 0–0.05 mm, by selective oil flocculation (the process “OVZUMS”), by implementing oil agglomeration and granulation [4, 5], selective latex flocculation [6]. In this case, it should be emphasized that the scope of practical application of selective aggregation of thin coal includes both the sludge of preparation factory (water-sludge system) and aged coal-containing material of preparation waste in sludge accumulators [7]. The actual task is to examine the application of this method for preparation the Donetsk coal of varying degrees of coalification and to establish character of the impact of main variation parameters on the results of oil aggregation of coal
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