SU1507419A1 - Apparatus for countercurrent flushing of slurry and filter cakes - Google Patents

Abstract

The invention relates to devices for washing precipitates and can be used in the chemical, food, hydrometallurgical and other industries to wash sediments from mother liquors. The purpose of the invention is to simplify the scheme of countercurrent washing of seepage sediments and increase productivity. The apparatus contains a vertical column consisting of filter sections 6 interconnected by hollow tangs 7, and having a cover 1 and a bottom 3. The column is equipped with supply nozzles 9 and outlet 2 of sludge, supply 8 and outlet 4 of the washing liquid and nozzle 5 for connection to pulsator The filter section consists of a package of rectangular frames 11 and 12 with filter cloth 13 installed between them, fastened with supporting and pressure plates 10. Inclined plates 17 are installed inside the frames. The frames 14 have through one on the upper side and nozzles 15 on the lower side and 16. The suspension enters through the nozzles 15 and 16 in the cavities of frames 11 and 12, from where it passes between the inclined plates 17, is filtered through the fabric 13, and the filtrate enters the cavity of frame 12, from where the suspension goes through channel 14. In the same way, the washing process comes from above way down. 3 il.

Description

The invention relates to devices for washing precipitates and can be used in chemical, food, H-adromethographic and other areas of extraction to remove sediments from mother liquors.

The purpose of the invention is the simplification of the scheme - we are the FLOW RINSE of filtering sediments and increasing productivity.

FIG. 1 shows an apparatus, a vertically-apy section, FIG. 2 and 3

315

filter section, vertical section, (in FIG. 2, the arrows indicate the phase of the pulsation of the medium in the apparatus upward, and on phi1. 3 - В1Шз).

The apparatus contains a krppka 1 with a nozzle 2 for removing the suspension of the washed sludge, the bottom I) with the nozzles 4 for withdrawing the filtrate and 5 connecting to the pulsator, filter sections 6 and drum 7. ). The upper side has a pipe 8 for the supply of industrial liquid, and the bottom pipe has a pipe 9 for feeding the washed precipitate.

The filter section (Figs. 2 and 3) is a packet sandwiched by thrust and pressure plates 10, assembled according to one of two frames 11 and 12, with which the filter cloth 13 is installed. Paivti 12 contain vertical channels in the upper part ; 14, connecting the cavity of the frame with the cavity of the overlying tsargi

7 and nozzles 15 expanding downwards. The frames 11 have opposite nozzles 15 in the lower part of the nozzle 16. Inside the frames, a row of inclined bent strattes 17 is installed close to the filter fabric and the side plates, and the direction of the plates on the sides of the planes facing away from the fabric - the bride nozzle on the lower sides of the frames.

The bag is sandwiched between the support and pressure plates 10 through the gaskets 18.

The device works as follows.

The precipitate intended for washing is fed into the apparatus through the pipe 9, the solid phase is pulsated through the nozzles 15 and the channels 14 moves upwards and passes into the suspension with a high content of particles through the pipe 2. The pulsation of the medium in the device is communicated by the pulsator through the pipe 5 the pipe 2 is connected to the expansion vessel to ensure the volume of the apparatus is filled with medium, and the pipes 2

8.9 and 4 have a significantly smaller section compared with nozzles 5

and 2 to reduce the effect of damping the pulsations of the medium in the apparatus.

Industrial fluid is supplied through the pipe 8, moves through the channels 14,

five

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0 5

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five

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45 50

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through the nozzles 15 and 16 and through the filter weel 13 to the bottom of the apparatus and in the form of a suspension with a low content of solids (filtrate) withdrawn / out of the apparatus through the nozzle 4. The washed sediment from the nozzle 2 is withdrawn through the expansion tank to the washing liquid compartment (for example on the filter or in the drying unit), and the slurry is promoted to separate the sediment impurities on the filter, returning the filter cake to the nozzle 9 of the apparatus for washing.

The countercurrent transport of the solid phase and the liquid in the apparatus is provided by the filter sections 6 in the following manner.

During the pulsation phase upwards (Fig. 2), the suspension from the underlying cortis 7 flows through nozzles 15 and

16 in the cavities of frames 11 and 12. From the cavity of frames 11, the suspension passes between the inclined plates 17, is filtered through the fabric 13, the filtrate also enters the cavity of the frame 12, from where the suspension leaves through channel 14 into the cavity of the overlying tsarga 7 in the amount of M (in the diagram - KaNM shows the direction of movement of the suspension, and linear - the movement of the filtrate). At the same time, the amount of suspension that passed during the pulse time — up to 1 through the nozzle 15, is M, through the nozzle 16 — M, and the filtrate volume Mt.

During the pulse, pulsat1: and down (Fig. 3), the suspension enters from the upper Carga 7 through channels 14 in the amount M in the cavity of frame 12, from where it moves between the inclined plates

17 to the filter cloth 13, as well as through the nozzle 15 into the lower bar 7. The amount of the filtrate from the cloth 13 enters the cavity paNmi 1 1 and the slot nozzle 16 also enters the cavity of the lower door 7. The amount of suspension passing through the nozzle 15 is this M, and through a nozzle 16 - M.

Of the working conditions of the pulsator, the amounts of medium pressed in different phases are equal, i.e. M M.

Since through the nozzle 15, during the pulsation cycle, more M of the suspension passes upward than M downward, the medium during the pulsation cycle will bring to the top of the filter section some

the amount of solid phase under the section. From the bottom of the filter section, this amount of solid phase is compensated by a certain amount of filtrate, since different hydraulic resistance of the nozzles and flaky perforations of the sheets 7 cause the amount of filtrate through the fabric 13 to exceed when pulsating down M over the filtrate when pulsing up

m ;.

Thus, the filtering section separates the suspension.

sediment with a high solids content, in the lower part - the bottom with a filtrate drainage pipe with a low solids content and a branch pipe, through which the column is connected to the pulsator, and in the middle part - filter sections interconnected by hollow tsars; supply of industrial liquid, in the lower side there is a pipe for supplying sludge, each filter section being made in the form of a bag of sandwiched between

I transported a solid phase from below 15 remote control with two plates of vertical rectangular frames, between which filter fabric sheets were installed along the entire plane of the frames, and vertical channels were made in the upper plates, midway up, and liquid - from top to bottom, regardless of the degree of dispersion of the solid phase and the density difference phases. The surface of the filter is developed (per unit volume) which provides, by the effect of which, l section sections, the combined capacity of the apparatus. oh, characterized in that, in order to simplify the scheme of countercurrent washing of filtration sediment and productivity 25, the bottom plates

The sections are fitted with nozzles, the frames are a series of curved inclined plates adjacent to the filter fabric on both sides, while the nozzles 30 are then expanding, then tapering down and are arranged in turn. The design of the apparatus is essentially a scheme of countercurrent washing of filtering sediments and slurries, replacing the filter cascade , tanks with agitators and pumps.

Claims (1)

Invention Formula Apparatus for countercurrent washing of slurries and filtration sediments, consisting of a rectangular vertical column, having in its upper part a cover with a branch pipe washed out 35 It is horizontal across and along the height of the column, and the direction of inclination of the plates facing away from the fabric coincides with the direction of the constriction of the nozzle. 7 JH rfp: S | Mt i & J L n J k J f 4 K- t; Mito " .. llTSW . LMiLiJiaLiLi sH-yjkVh t R.j dSiT TTrat coal frames, between which filter filter sheets are installed along the entire plane of the frames, and in the upper plates, vertical channels are made, through which l ortruyuyuschie sections are connected between co. oh, different35 It is horizontal across and along the height of the column, and the direction of inclination of the plates facing away from the fabric coincides with the direction of the constriction of the nozzle. 7th . G7 - 13 . ff 11 1 Ft one. sixteen Thebes