SU1613127A1 - Cascade air classifier - Google Patents

Abstract

The invention relates to the pneumatic classification of bulk materials in ascending air streams and can be used to separate materials into two products of a grain size of 0.05-5.0 mm in the mining, chemical, metallurgical, construction and other industries. The purpose of the invention is to improve the quality of separation. The classifier contains a separation shaft 1 of rectangular cross section with pouring elements 3, made in the form of a set of parallel inclined plates (NP) 13, installed one above the other with a gap and fixed on the end walls 2 of the shaft 1. In the side wall 14 of the shaft 1, a branch pipe 4 is installed feed source material. In the lower and upper parts of the shaft 1, respectively, branch pipes for large 12 and small 5 products are located. The length of each upstream NP 13 is less than the length of the downstream. The free edges of the NP 13 are separated from the side walls 14 by an equal distance. The source material is fed to the pouring elements 3. As the elements 3 consist of several NPs 13, which have different lengths and the free edges of which are equidistant from the walls 14, the material falls on all NPs 13 at once and is poured in several streams into the separation zone, where exposure to air flow. 2 Il.

Description

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about 1

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M

316

(NP) 13, installed with a gap one above the other and fixed on the end walls 2 of the shafts 1, In the side wall 14 of the shafts 1 there is a nozzle A of the source material. S of the lower and upper parts of the shaft 1, respectively, are located the nozzles for large 12 and small 5 products. Dpina each higher NP 13 less than the length below. The free edges of the NP 13 are removed from the side windows.

The invention relates to devices for the pneumatic classification of bulk materials in ascending air streams and can be used to separate materials into two products of a boundary size of 0.05 to 5.0 mm in the mining, chemical, metallurgical, construction and other areas.

The purpose of the inventions is to increase the quality of separation.

FIG. 1 shows a classifier of the general view; in fig. 2 shows section A-A in FIG. one.

The device includes a separating shaft of rectangular cross section 1, on the end walls 2 of which the perceptive elements 3 are fastened, the source material supply nozzle 4, the fine material nozzle 5, the duct 6 for output from. air apparatus and small product cyclone 7 with a hopper 8 for trapping and collecting small prodzdsta, duct 9, valve 10 for adjusting the air flow, fan 11, pipe 12 for a large product. The filling elements 3 are made of separate plates 13, mounted one above the other with a gap of 0 along the normal, the length (area) of the above-placed plate 13 is less than the length (area) below. The free edges of the plates. 13 all the elements 3 are equidistant from the side walls 1.4 of the shaft 1. The pipe 4 is installed in the wall, the pipes 5 and 12 respectively in the upper and lower parts of the shaft 1.

.. Classifier works in the following way.

nok u at equal distance. The source material is fed to the lateral elements 3. Since elements 3 are made up of several PIs 13 that have; different length and free edges, which; If they are equidistant from walls 14, then the material gets immediately to all NP 13 and merges in several streams into the separation zone, where it is exposed to an air flow of about 2 sludge.

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five

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five

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five

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five

The raw material through pipe 4 is fed into the shaft 1 for any of the medium pouring cores 3. Since the elements 3 consist of several plates 13 that have different lengths (fruit) and whose free edges are equidistant from the side walls 14 of the shaft 1, the material immediately falls on all the plates 13 and is connected in several streams to the separation zone located between the plates 13, the end face 3 and the side 14 of the walls of the shaft 1. The air flow generated by the fan 11 sweeps the material each plate In this case, the classification process proceeds efficiently, since the material is uniformly distributed over the volume and each jet is blown by a stream of air having a constant speed over the entire height of the separation zone. Large particles separated in the first stage fall towards the air flow and fall onto the plates. 13 of the downstream element 3, where the separation process is repeated. The small fractions under the action of air flow up into the disposed section of the mine and are also subjected to additional separation. The final large product is collected in the bunker .12.-The fine product is discharged from the apparatus through the duct b, passed into the cyclone 7 and enters into the bunker 8. Purified. air through the pipeline 9 enters the suction inlet of the fan 11. Regulation of air flow when changing boundaries; section is carried out with the help of the fan 10

Since the area of the plates in the exchange element decreases in the direction.

Research institutes from bottom to top, the upper edges of the plates are located on pasHb peoc L-. x from the contiguous: side wall of the shah nd 1pcG out-lying folder, this distance is greater than the depth of the downstream. As a result, the cross section of the shaft, of the apparatus, is the truth on a number of inclined channels directed to the center of the shaft. Split zones, and directions

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r by height.

The lower edges of the plates of all elements are equidistant from the side walls of the shaft. Consequently, the space of adjacent elements does not have a through vertical section, which is not divided by plates into channels, and the material slipping down

:: L :: TZ Such a design of the pouring device makes it possible for the material to fall directly on all the plates of the element, and not only on the top, as in the prototype. The clearance of the plates along the normal is 4-10 diameters of a clump of large particles of material to be separated. This value is chosen, due to the condition that particles are jammed in the gaps and to install a sufficient number of plates. The raw material is evenly distributed over the plates, and then falls down into the main separation zone.

25

thirty

3127 and

broken (by the number of plates) on a number of streams. The air flow rate in the zone is unchanged along its height, since

5 EDGES of the plates are equidistant of the side wall of the shaft. B, the result of the classification process occurs at odi. conditions (material concentration and flow rate) throughout the entire separation zone, which allows for efficiency

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Cascade pneumatically kpassii. .-.-z

plates, installed. with a gap of one P --- s, x on butts "

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Claims (1)

Claim Cascade pneumatic classifier, including a rectangular cross-section separation shaft with bulk elements made of 20 in the form of a set of inclined parallel plates mounted with a gap one above the other and fixed on the end walls of the separation shaft, a supply pipe of raw material, charters — 25 len in the side wall separatsion. shaft, and pipes for large and small products, located respectively in the lower and upper parts of the separation shaft, from 30 l and more so that, in order to improve the quality of separation, the length of each plate upside down shorter than the length of the non-located, and the free edges of the plates are removed from the side walls at an equal distance.