Acta Montanistica Slovaca (Dec 2006)
Preparation of low-ash products from Slovak lignitic coals – material balance
Abstract
A preparation of low-ash coal products was performed with the aim to obtain asuitable charge for the extraction following processes of organic substances. Thus, for this purpose, the coal feeds from two collieries, namely Záhorie and Nováky were washed in the water-only cyclone with a diameter of 150 mm. The vortex finder and apex diameters were 68 mm and 14.6 mm, respectively. The cone consisting of three angle sections 135°-75°-20° was applied. The products obtained on the overflow of the cyclone were decantated to remove the rests of slurries. In such a way, washed coals with the ash content in the dry matter of 5.44 was prepared from lignite of Záhorie. Similarly, as to coal from Nováky the ash content of 9.21 % was achieved.
