METHOD FOR GRADING OF LUMP MINERAL MATERIALS AND DEVICE FOR ITS REALIZATION Russian patent published in 1998 - IPC

FIELD: may be used in mineral concentration, in particular, concentration of ores of nonferrous, rare and noble metals. SUBSTANCE: method consists in that the lumps of mineral mass are placed in registration cells installed on rotating disc where they are exposed to radiation, and physical effect from each lump is registered with accumulation of results. Before use of separation unit, error is evaluated and compared with the set value. Each lump is rotated until measurement error becomes less than the set value, and then average content of useful component in lump is calculated, and on the basis of results, separation is conducted. Grading by activation method is carried out by exposure to radiation of all lumps from common source through individual collimators, and registration is carried out by separate detector when collimator is closed by shutoff shield. The device for realization of the method has measuring and separating cell which consists of two spring-loaded caps clamping the graded lump and system of rockers, tie-rods and gear wheels rotating lump and moving radiation source and detector over it. Here are installed trippers and guide troughs for separation into four grades. All cells are installed on rotating disc. Located under disc over circumference are separating platforms with cams which control disposal of lumps into respective circular bin. The device has conveying distributor with automatic manipulator which places individually each lump between spring-loaded caps. Besides, it may place and take off reference lump models for their repeated use. The device has unit for removal and installation of measuring-separating cells consisting of lever-rack mechanism mounted on transportation car moving over curved guides with the help of carrier connected with electric motor. Unit adjacent to disc pushes catchers and pulls base with measuring-separating cells onto car and stops. EFFECT: higher quality of lump concentration due to reduced measurement error of each graded lump without decrease of productivity. 8 cl, 13 dwg