SU1694242A1 - Arrangement for screening asbestos ores - Google Patents

Abstract

The invention relates to a technique for separating bulk materials and improves the quality of asbestos fiber. The device contains an oscillating screening surface made of a sieve 9 and a separation surface (PR) 10 adjoining it. In this case, the PR 10 has projections 11 in the form of spherical segments that are evenly distributed over it. Above PR 10, a device for air suction 2 is installed. The superlattice product in the PR 10 zone during movement between spherical segments and under the influence of vibrations (vibrations) is more intensively loosened and delaminated, which improves fiber extraction and the quality of the fractions obtained. 1 hp f-ly, 2 ill. w YO about h 4 Yu 4 Yu figure 1

Description

This invention relates to a technique for separating bulk materials and can be used to enrich asbestos

RUD

% The purpose of the invention is to improve the quality of asbestos fiber.

FIG. 1 shows a device, a longitudinal section; in fig. 2 — separation surface in suction view,

The device contains a screen 1 and a device for sucking air, an air inlet 2 with a hinged wing 3 attached to its end walls. Screen 1 includes deck 4, loading nozzle 5 and discharge nozzles b and 7, respectively, for the oversize product (descent) and an undersize, oscillator 8, a screening surface made of a sieve 9 and a separation surface 10 adjoining it. On the surface of the separation 10, protrusions 11 are made in the form of spherical segments that are uniformly distributed over it. In this case, the protrusions 11 are arranged parallel to the axis of the suction slit 12 of the air intake 2 and in staggered order, the air intake 2 is installed above the surface 10. The distance (0 between the bases of the segments is not less than the maximum particle size in the oversize product, the height of the spherical segments ( h) at least the height of the layer of the oversize product on the separation surface. The wings 3 of the air inlet 2 are fixed along the suction slit 12 and are designed to control the extraction of the light fraction (asbestos fiber) from the area syvani. The width of the suction zone somewhat higher (15 to 20 mm) of the distance between the free (unfixed) ends of the wings 3.

From oscillator 8, deck 4, circular oscillations are associated with the separation surface. The starting material, for example, an asbestos-containing product, is fed through the loading nozzle 5 to the sieve 9 and moves along it towards the discharge end of deck 4 along the path in the form of a cycloid. When moving along the sieve, it is divided into the above-sieve and under-sieve products. The undersize product is discharged through the pipe 7, the oversize product is stratified when moving along the movement. At the same time, asbestos fiber and part of small rock particles float to the upper layer, and large rock particles concentrate in the lower layer. When the oversized product enters the surface zone 10-where the protrusions 11 are made in the form of spherical segments, it is loosened. Loosening of the oversized product occurs

when moving between the protrusions with simultaneous exposure to vibrations (oscillations) of screen 1, which contributes to an additional ascent of the fiber that did not fall into the upper layer when moving along the sieve 9. The spherical surface of the protrusions 11 promotes a smooth flow around them with a non-shear product during movement, which prevents the formation of stagnant sections. When the oversized product moves in the surface zone 10, its further separation occurs: the asbestos fiber moves along the convex part of the spherical segments due to the higher specific surface and higher coefficient of friction, and small particles with a smaller specific surface and lower coefficient of friction move along the spherical surface segments in the layer of large rock particles. In the zone of action of the air jet of the air intake 2, the fiber is most concentrated on spherical segments with some part of small rock particles and dust, the fiber is practically

It is absent in the lower layer of large rock particles (in the rumble of the rumble) and is lifted by aerodynamic lifting force from the surface of spherical segments. The uniform distribution of the projections 11 on

the separation surface (the protrusions are equidistant from one another) contributes to a uniform concentration of the fiber along their spherical surface over the entire area, which ensures uniform extraction

fibers from the entire surface area 10. When the protrusions are placed in 11 rows parallel to the axis of the suction slit 12 and in a checkerboard pattern, the oversize product moves between them along a zigzag path, thus loosening and separating it more intensively, which improves the suction conditions of the light fraction and the quality the resulting fractions.

Claims (2)

Claim 1. A device for screening asbestos ores, including an oscillating screen surface, loading and unloading nozzles, air suction device, characterized in that, in order to improve the quality of asbestos fiber, the device is provided with a separation surface interfaced with a screening surface made with spherical segments evenly spaced on it, air suction is located above the surface of the separation. 2. The device according to claim 1, characterized in that the protrusions are arranged in a checkerboard pattern and are rows parallel to the axis suction gap of air suction device. i / 71 Fig2