Abstract
Hard coal remains a valuable power raw material, especially in aspect of clean technology application. The first stage of these technologies is to prepare coal concentrate of low ash content. The paper illustrates the quantitative growth of production value of good quality concentrate by means of concentrate re-preparation using two jig system. Jigs separation curves present the shape that diverge from perfect curve; this fact causes that incorrect grains appear during gravity separation process. Secondary preparation in jigs improves the shape of resultant separation curves. Due to this fact, in two jig system, at the same demanded ash content of final concentrate it is possible to gain the significantly greater production value than in case of single jig – especially in case of small demanded ash content. Increase of production value is especially meaningful in case of hard-dressed coal. If there are more jigs in preparation plant, thus the purposeful operation is to use them properly by means of economically profitable secondary preparation utilization. During secondary preparation it is possible to gain concentrate of lower ash content than in case of a single jig.
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