Impact of hydraulic load of centrifuge and its technical parameters onto size of sorted grain

In the paper, equations connecting a height of reflux damming up in overflow window of sedimentation-filtration centrifuge and a size of sorted grain in a function of hydraulic load of centrifuge and its technical parameters were presented. The size of sorted grain has a repercussion in a content of solid phase in the reflux of centrifuge. The solid phase in the reflux is a source of inevitable losses of small quantities of coal. It is of importance to have these losses minimalized to technically possible quantities. Every decrease of solid part content in overflow brings definite economic advantages. The losses of coal in the reflux can be reduced by: -selecting suitable technical parameters of centrifuge, -diminishing the hydraulic load of centrifuge through increasing of concentration of solid parts, -improving conditions of sedimentation of solid parts in the reflux layer flowing from centrifuge by selecting suitable grain-size distribution of solid parts, as well as by use of chemical agents of aggregative or/and hydrophobizing properties. From analysis of equation obtained, it results that essential parameters, which have impact onto the size of sorted grain, is the hydraulic load and a number of turns of centrifuge. In industrial conditions, the simplest way of the sorted grain size change is a change of hydraulic load of centrifuge. The analysis was supported with a computational example.