METHOD AND DEVICE FOR DRESSING GRAVELS OF PLACER DEPOSITS OF PRECIOUS METALS Russian patent published in 2020 - IPC B03B7/00 B03B9/00 

FIELD: mining.

SUBSTANCE: proposed group of inventions relates to ore mining and processing equipment, namely to methods and devices for separation of bulk materials by size, and can be used in dressing of alluvial deposits of precious metals. Method of beneficiating sand deposits of alluvial deposits of precious metals, initially, the direction of rotation of the vibration engine is set to set the direction of the vector of the driving force of the vibratory engine relative to the center of mass of the vibration screen and the angle of inclination of the stencils of the sluice. Preliminary disintegration of initial material is carried out in loading hopper. Obtained pulp from loading bunker at angle of 5 to 15°, providing optimum speed and uniformity of feed flow of pre-disintegrated pulp, supplied to vibrating screen and its final disintegration. Classification of the washed material is carried out on a vibration screen installed at angle from 5 to 15°, preferably 10°, which provides uniform movement of pulp along sieves of vibration screen under action of gravity and excitation force of vibration motor and optimum time for disintegration and screening on fractions of +55 mm and -55 mm with removal of fraction of +55 mm into waste, -55 mm and +28 mm with removal of fraction of +28 mm into waste and -28 mm. At the final stage separate separation of pulp with fraction with size of 28 to 0.2 mm is performed with separation into concentrate and tails in inclined from 8° up to 12° sluice with pitch of riffles of not more than 0.1 m at height of flutes from 1.5 to 2.5 sizes of negative fraction. In addition to loading hopper with a disintegrating device, a vibration screen and a sluice, the device for carrying out the method additionally contains an unloading hopper and an unloading tray. Loading hopper contains a tray part entering into a dimension of a vibration screen. To reduce wear of the upper screen, the sluice comprises a head and a drag portion. Drape carpets and stencils are mounted at the bottom of the drag portion. Stencils ribbons are made in the form of non-equilateral angles, which lower shelves are mounted at angle of 65° up to 85°, preferably 75°, in relation to the bottom of the drag part towards the pulp motion, and upper shelves at angle of 125° up to 145°, preferably 135° relative to lower shelves. Disintegrating devices are mounted above the trough part of the loading hopper, in front and behind the vibrating screen outlets. Bottom of tray part, gate of lock, unloading hopper, unloading tray, binding beams, supports and unloading plates are lined with protective coating. Edges of lining of tray part are made in the form of wedge-shaped cutouts with possibility of reduction of impact load to upper sieve without loss of its working length during screening. Unloading bin of unloading hopper and inlet end of vibration screen are equipped with aprons with possibility of protection against abrasive wear and prevention of pulp leak through gaps of device elements.

EFFECT: increased specific volume of production of precious materials from placer deposits.

19 cl, 20 dwg