SU1563760A1 - Laminated classifier - Google Patents

Abstract

This invention relates to a hydraulic classification of materials. The goal is to increase the efficiency of classification and performance. In an inclined housing (NK) 1, separation plates (RPs) 2 are installed, located in a bunker 3 installed in the lower part of NK 1. NK 1 has a distribution manifold 4 for supplying the classifying fluid. Parallel pulsation chambers (PCs) 12 installed evenly along the cross sectional area of the classifier in parallel to RP 2 12. A compressed air source 14 with a collector 13 is connected to a PC with 12 nozzles 15. Valves 16 are installed at nozzles 15. A collector 4 communicates with PC 12 nozzles . On top of the PC 12 are closed with covers 18. Under the PC 12 along their entire length there are bump stops installed. The distribution manifold 4 and the collector 13 are located above the PC 12. The inlet pipe 5 and the collector 4 are made in the form of high resistance pipelines. The original slurry enters through conduit 5 and is distributed through channels between RP 2. Through the collector 4, the classifying fluid enters the apparatus and is distributed through PC 12, where pneumatic pulses are generated from source 14. The oscillations are transmitted to the pulp located in the channels between RP-2. The classifying liquid leaves PC 12 and moves upward through the channels between RP-2. Large particles settle on RP-2, slide into the hopper 3 and unload through the nozzles 11. Thin particles are discharged through the holes 7 and inclined bottom 8 drainage trays 6, pockets 9 and fitting 10. Buffers prevent the erosion of large particles in the hopper 3. 3 Il., 3 tab.

Description

The invention relates to the means for classifying finely divided solid materials and can be used in the technique of enrichment of ore raw materials in the mining, hydrometallurgical and chemical industries.

The purpose of the invention is to improve the classification efficiency and productivity of the plate classifier.

FIG. 1 shows the device, a general view; in fig. 2 - the same plan view; in fig. 3 shows section A-A in FIG. one.

The classifier includes an inclined body 1 with separation plates 2 installed in it. Pyramidal bins 3 are installed in the lower part of the inclined body 1. The inclined body 1 is fitted with an inclined body 1 in the form of a distribution manifold 4. In the upper part of the inclined body 1 inlet pipe 5 of the original pulp. A device for removal of fine particles is installed in the upper part of the device, including perforated overflow drain trays 6 with openings.

7 and inclined bottoms 8, pockets 9 and fitting 10 for removal of fine particles. In the lower part of the inclined body 1 there are fittings 11 for removal of large particles.

An inclined housing 1 parallel to the separation plates 2 are installed evenly distributed across the cross-sectional area of the classifier flat pulsation chambers 12. The collector 13 is in communication with the source 14 of compressed air and connected to the flat pulsation chambers 12 by nozzles 15. The nozzles 15 are fitted with valves 16. communicated with pulsation chambers 12 with additional nozzles 17. The pulsation chambers 12 are covered with lids on top 18. Under the pulsation chambers 12, they are mounted along the entire length of their pulsation iki 19. The distribution manifold 4 and a collector 13 are located above the pulsation chamber 12. The inlet conduit 5 and initial pulp distributing manifold 4 are made in the form of pipelines of high resistance.

Lamellar classifier works as follows.

The initial pulp enters the apparatus through the high-resistance inlet conduit 5 into the upper part of the inclined housing 1 and is evenly distributed throughout the area of the apparatus into the channels formed by the inclined separation plates 2. The classifying liquid enters the apparatus through the distribution manifold 4 and evenly distributes around the pulse. chambers 12. From the source 14 of compressed air through the collector 13 in the pulsation chambers 12, pneumatic pulses of a certain power are generated,

vibrating fluid and suspended solids; If a pulsator is used as a source of compressed air, the oscillation frequency (pulsation) is governed by the number of revolutions and the number of openings of the pneumatic pulsator through windows, and the amplitude by the pressure of compressed air. The reciprocating oscillatory movements of the fluid in the pulsation chambers 12 are transferred to the pulp (liquids and precipitating solid polydisperse particles), which are located in the channels formed by the separation plates 2. enters the lower parts of the parallel channels. The solid material entering the channels is classified under the action of upward fluid flow and the application of reciprocating oscillations. The coarse solids are deposited on the separation plates 2 and under the action of gravity they slide into the bunker 3, the fine particles - sludge are transferred with an upward flow of fluid into the upper part of the apparatus. The solid particles deposited in the bunker are concentrated and removed from the apparatus through nozzles 11 in a known manner. In the upper part of the apparatus, the pulp containing fine particulate matter is removed by gravity through the openings 7 of the drainage trays 6, the pockets 9 and the fitting 10. The bump stops 19 installed under pulsation chambers 12 prevent the pulp condensing in the hoppers from washing out due to the change in

5 directions of pulses coming from the pulsator. Using the fans 16 installed on the nozzles 15, the compressed air is uniformly distributed through the pulsation chambers 12 to equalize the amplitudes of the oscillations.

 Example. The classification process is subjected to pulp, the sieve characteristic of which is presented in Table. one.

The initial pulp having a density of 1405 kg / m3 (ratio, 1: 1) is fed into a plate thickener with a flow rate of 57 m3 / h. The mirror area of the thickener discharge is 10.9 m2 (mirror size is 3.5 x 3.12 m). The apparatus contains 150 plates, the distance between which is 50 mm. Plate angle

0 55 °. The device is made in three sections, the size of the plates is 1X2 m. The device is equipped with a spool-distributing device - a pulsator - to provide reciprocating oscillations. In the apparatus evenly over the entire cross-sectional area

. The apparatus has four pulsation chambers having a width of 100 mm. Pulsation chambers are mounted parallel to inclined plates. The amplitude of oscillations in the pulsation chamber is 500 mm, respectively, the amplitudes of pulp oscillations in the working part of the settling channels are 25 mm. The oscillation frequency in the apparatus is 30 count / min. In order to achieve higher rates of classification, a classifying fluid is supplied through a distribution manifold, the flow rate of which is regulated depending on the density meter indicators installed in the upper part of the apparatus and measuring the density of the pulp - the top product of the classification. If it is necessary to classify the pulp according to a thinner boundary mirror, the flow rate of the classifying liquid increases accordingly, which leads to a large dilution of the upper drain and precipitation of the finer classes of particles into the bottom product.

Since the density of the original pulp varies within certain limits, the flow rate of the classifying fluid also varies between 73-86 m3 / h. The speed of the ascending channel in the channels averages 12.3 m / h. The density of the overhead classification product is about 1170 kg / m3 (ratio, 2: 1). The lower product of the classification, having a density of 1920 kg / m3 (ratio, 3: 1), is discharged from the pyramidal bunkers with the aid of airlifts with an additional supply of "transport water". The load on the solid product, referred to the cross-sectional area of the apparatus, is 73.2 tons / m2 day. The specific consumption of the classifying liquid is about 2.4 m3 / t solid. The sieve characteristics of the top and bottom classification products are presented in table. 2 and 3.

From the data table. 2 and 3 it follows that in a lamellar thickener equipped with four pulsation chambers, when applying reciprocating oscillations to the flow with the parameters described above

the process achieves high technological parameters of the classification process. The top product contains almost no particles of class +0.074 mm, and the bottom pro f. The product contains only the minimum number of particles of a class - 0.074 mm. The classification efficiency in the proposed apparatus is calculated by the formula:

YuMr-AMa-c) L-a- (100-csMP c)

“J4- (95.24-72.37). (72.37-5.27) IC, in / 72.37 (100-72.37) - (95.24-5.27) wherea.r.v - the content of one or another small class in the original diet, 5slive and in the lower product .

Claims (1)

Invention Formula Lamellar classifier, including inclined body with installed 0 there are dividing plates located in the lower part of the sloped bunker body, conjugated with the internal space of the sloping body, a device for feeding the classifying 5 fluid and the inlet pipe of the original pulp, a device for removing fine particles installed in the upper part of the inclined body and fittings located in the lower part of the inclined body for removing large particles; 0 by the fact that, in order to increase the efficiency of classification and productivity, it is provided with dividing plates installed parallel to the separation plate and placed evenly across the classifier’s cross-sectional area 5 flat pulsation chambers communicated with a compressed air source by a collector and connecting pipes to the collector with the pulsation chambers, moreover, the device for supplying the classifying liquid is designed as 0 distribution manifold with additional connections, and collectors located above the pulsation chambers. Table 1 table 2 +0.25 +0.1 +0.074 -0.074 42.68 40.74 11.31 5.27 3  gt W. 14 Classifying fluid Aa 3 Fig. 3 Table 3 / 7 72 72 Sl8 FIG. one tfxai cw0 / J7ffe0 ffosfyxa  ffxod original pulp 12