Method for enrichment of heavy fine-fractional concentrates

摘要

The invention relates to the enrichment of heavy fine-fractional concentrates with the aim of extracting loose conditioned non-chemically combined minerals, for instance gold and platinum. The inventive method consists in pre-grading a mined rock; mixing it with water and supplying it by means of a pump to a multichannel volute arranged above a grading screen of a hydraulic picker; and equalizing the mixture in the channels of the volute on the surface of the screen. The grading can be carried out in one or several steps i.e. using several hydraulic pickers fitted with screens having grading orifices of different diameters in order to "strain" the mined rock when a fine pulp passes along the surface of the screen. A through product is fed from the last (n-th) picker to an "alveolate" discharge pipe (made of several honeycombed tubes). Several cutters fitted with a device for regulating the flow rate of a mixture arising from the pulp are arranged inside each tube. When enriching an initial mined rock having a large specific mass, a vibrator having a variable power pulse array and a power pulse and oscillation frequency control valve is mounted in front of each cutter in the alveolate discharge pipe at a variable angle alpha .