RU1787545C - Apparatus for concentrating coal - Google Patents

Description

high-ash fine sludge from concentrate. .

Another disadvantage of the apparatus is the limitation of the upper limit of fineness to less than 0.074 mm of an effectively enriched material. For enriching a larger material, the cross-sectional profile of the gutter is not optimal: the slope angle of 6 g to the bottom of the gutter in the transverse section1 is insignificant, which leads to the drift of rock particles into the industrial product area, and the industrial product particles into the concentrate zone, those. enrichment products are interlocked and coal sludge separation efficiency is reduced.

The purpose of the invention is to increase the efficiency of coal separation.

This goal is achieved by the fact that in the known apparatus, including a multi-turn screw gutter, consisting of a bottom with external and internal sides, a loading device and receivers of separation products, the bottom of the gutter in a transverse section is made in the form of a broken line, the angle of inclination to the horizontal with the inner side of the bottom sections increases from the upper turn to the lower from 17 to 30 °, the angle of inclination to the horizontal of the sections of the bottom mating with the outer side is from 20 to 25 °, while the outer side of the last turn full of perforated and with a receiver for collecting sludge / Closed apparatus It differs from the prototype in that the bottom of the gutter in the cross section is made in the form of a broken line, the angle of inclination to the horizontal of the sections of the bottom connected to the inner side increases from the upper turn to the lower 17 to 30 °, the angle of inclination to the horizon of the portions of the bottom associated with the outer side is from 20 to 25 °, while the outer side of the last turn is perforated and with a receiver for collecting sludge.

In FIG. 1 shows a screw apparatus, general view; in FIG. 2 - helical groove at the last turn, cross section.

The coal enrichment apparatus comprises a loading device 1, three multi-byte screw troughs 2, each of which is equipped with receivers of separation products 3.

The multi-turn helical trough consists of an inner side 4, a rock zone 5, and a central (industrial product) zone b. concentrate zone 7, outer side 8, made at the last turn perforated and with a receiver 9 for collecting sludge. The coal enrichment apparatus operates as follows.

The initial water-coal mixture, with a solid content in the range of 400/500 g / l

fineness of 0-3 mm through the loading device 1 is distributed over three channels. The pulp moves from top to bottom along the helical groove 2 in the form of a stream unfolded into a fan.

0 Coal particles in a given stream are affected by forces: gravity, friction, hydrodynamic and centrifugal. The particles are also affected by the vertical component of the velocity of the water jet. The interaction of these forces leads to the fact that the motion of coal particles of different densities along the bottom of the helical trough occurs at different speeds. In this case, the coal particles acquire a finite (established) speed already at the first one and a half turns. Relative particles of coal with a density of more than 1800 kg / m3 move near the inner side 4 in the rock zone 5. industrial products with a density of 1400-1800

5 kg / m3 are located in the central zone 6, and light concentrate fractions with a density of less than 1400 kg / m together with high-ash fine sludge are concentrated in the concentrate zone 7

0 at the outer side 8. At the last turn, high-ash fine coal sludge with an ash content of 24-25% under the action of centrifugal force through the perforated outer side 8 enters the receiver for

5, sludge collection 9, from where it can be sent for further enrichment by flotation.

The remaining conditioning products: rock, first product and concentrate are discharged at the end of the screw channels into the receivers of separation products 3.

The present invention has the following advantages compared with the prototype. Increase efficiency

5 separation of coal due to the fact that the cross-sectional profile of the gutter provides a more complete and efficient use of the area of the helical gutter, since in this case the water-carbon flow is not offset from

0 of the inner side to the middle of the trench, and rock particles, shifting towards the inner side, move near it in the rock zone, intermediate and concentrate particles, having acquired a finite steady-state speed, move accordingly in their zones. The cross-sectional profile of the trough provides a reduction in the mutual clogging of the enrichment products. By removing from the concentrate by centrifugal forces through

the outer side of the high ash fine sludge perforated at the last turn into a sludge collection vessel, thereby improving the quality of the concentrate and partially dehydrating it.

Claims (1)

SUMMARY OF THE INVENTION A coal enrichment apparatus comprising a multi-turn helical trough, consisting of a bottom with outer and inner sides, a loading device and separation product receivers, a heater which, in order to increase the separation efficiency, the bottom of the trough in cross section is made in the form of a broken line, the angles of inclination to the horizon of the sections of the bottom mating with the inner side increase from 17 ° to 30 ° from the upper turn, and the angle of inclination to the sections of the bottom with the outer side are from 20 to 25 °, while the outer side of the last turn is perforated and with a receiver for collecting sludge.