The centrifugal concentrator’s operating principle can be formulated as the forced separation of the processed material into two fractions: a "heavy" and "light" in a centrifugal field. Separation of the material into fractions takes place by the interaction of the flushing water flow, centrifugal forces and the gravitational field acting on a particle in an inclined or horizontal rotating rotor. The intensity of the separation process is increased by the density fluctuations mineral layer caused by the inclined or horizontal position of the rotor.
The processed material is fed into the spinning rotor, in which it is accelerated to an angular velocity close to the speed of the rotor. At the same time, the rotor is supplied with wash water at a predetermined pressure. Due to the horizontal or inclined (non-vertical) position of the rotor’s axis of rotation by gravity the weak fluctuations of mineral layer are created in radial and axial directions and with the rotor’s frequency of rotation As a result, particles of a material with greater proportion of a certain value ("heavy" fraction) under the action of centrifugal forces move toward the walls of the rotor, against the flow of the washing water and are deposited on its walls. Particles of a material with lower specific weight ("light" fraction) are displaced to the inner surface of the cone and the stream of water goes on the plum through the rotor’s edge. Gradually, due to the replacement of the light particles by heavy ones there is a change of sediment's structure and the accumulation of the heavy fraction. The process efficiency depends on the angular velocity, the washing water pressure, size grade and liquid / solid ratio in concentrator’s feed.
EFFICIENCY OF GOLD EXTRACTION
Below are the results of industrial tests to determine the degree of extraction of free particles of gold, conducted on different types of ground ore, gold sand, dredging wastes and heavy concentrate finishing tailings.
EFFICIENCY OF GOLD EXTRACTION FROM RAW MATERIALS WITH FLOTATION FINENESS
Removing free gold from ore as raw material is carried out with high efficiency. The extraction level depends on the quality of the preliminary grinding operations, disintegration and classification.