APPARATUS FOR DRY SEPARATION OF HEAVY MATERIALS OFF MIXTURE OF GRANULATED MATERIALS WITH DIFFERENT DENSITY VALUES Russian patent published in 1995 - IPC

FIELD: apparatus for gold separation. SUBSTANCE: apparatus has the housing 1 with a large number of chambers 4, being open from upwards, forming an annular configuration and having the grid 23, on which the rings 24, 25 are arranged. The rings 24, 25 from grid compartments 46. A scraper structure, having a large number of scraping strips 40, 41, radially extending from the sleeve 34, 35 respectively, is arranged over the compartments 46. Pressurized air is being fed successively and cyclically into chambers 4 with the aid of the spool valve 7, arranged in a center of the annular chamber configuration. A rock material is being fed from upwards into the sleeves 34, 35, and it is being swept outwards from the compartments on the grid 23 by the scraping strips. With use of air jets the rock material is being swept from adjacent chambers 4, providing a possibility for gold and other heavy minerals to be deposited on a bottom of the compartments 46. In the result of gravitational separation small heavy particles are being passed through the grid 23, and then through the discharging openings they are poured on bottom of the chambers. EFFECT: enhanced efficiency. 13 cl, 11 dwg