SU1662623A1 - Apparatus for dewatering of suspensions - Google Patents

Abstract

This invention relates to a technique for dewatering slurries and highly moist particulate materials. The purpose of the invention is to intensify the dewatering process. The purpose of the invention is achieved in that the rollers of the apparatus are perforated and covered with a porous-elastic material. Inside the rollers there are hollow conical elements with radial-spiral blades on their outer surface and radial partitions on the inside, with holes in the place of attachment of the radial-spiral blades, and pressure rollers are installed under the rollers. 2 Il.

Description

The invention relates to a technique for the separation of heterogeneous media and can be used in the chemical and related industries of the industry for dewatering suspensions.

The purpose of the invention is to intensify the process of dehydration

FIG. 1 shows a slurry dewatering apparatus, a cross-sectional view; FIG. 2 is a section A-A in FIG. one

The apparatus consists of cylindrical perforated rollers 1 and 2 provided with a drive for counter-rotation, covered with an elastic porous material 3 and placed between the end walls, one of the rollers being mounted horizontally to adjust the force of pressing the rollers against each other.

The porous material 3 can be covered with protective fabric 4 resistant to abrasive forces.

In the cavity of the rollers 1 and 2 are placed conical elements 5, to the outer surface of which are attached radial-spiral blades 6, installed in such a way that the other end they are fixed on the inner surface of the rollers 1 and 2

In the place of attachment of the blades 6 in the conical elements 5 are made holes 7.

In the inner cavity of the conical elements 5 are placed radial partitions 8

The apparatus is equipped with nip rollers 9 mounted under the rollers, the rollers being installed with the ability to move towards the central axis of the corresponding roller to provide the necessary clamping force to it, liquid phase collectors 10 located under the rollers 9, and solid phase collector 11 located under the roller joint .

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The device is also equipped with a feeder 12 and pullers 13 products.

The device works as follows.

Moving roller 2 to roller 1 sets the necessary clamping force between them, by moving rollers 9 the latter also pressing against rollers 1 and 2, after which the rollers are rotated. An initial suspension, located in a kind of bath, is fed to the joint between the rollers from the feeder 12. The liquid phase of the suspension is absorbed by the porous material 3, and the solid product is captured by the rotating rollers 1 and 2 and is moved between them.

As the product (particles) reaches a common horizontal axis of rollers 1 and 2, the porous material 3, shrinking more and more, reduces its pore space. The product particles are introduced into material 3, and the liquid phase is squeezed out of it both over the pores, moving upward against the direction of rotation, and passing through the perforations of the rollers.

1 and 2, after which, a stack along a radial-helix blade 6 m. Enters through the holes 7 into the inside of the conical elements 5, from where it is led out of the apparatus. At the same time, the radial partitions 8 prevent the penetration of moisture to the lower openings 7 of the elements 5 and thus help to remove moisture from the latter.

As can be seen from FIG. 1, the greatest pressing force of the product particles is reached when they pass a point located on the common horizontal axis of rollers 1 and 2. Subsequently, when particles pass below this axis, a particularly significant dewatering effect is achieved: the porous material 3 begins to expand, the pore space is restored in it, moreover, initially in the form of capillaries and pores of very small diameter, and therefore, with

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high capillary potential. A film of the liquid phase, preserved on the particles of the product, is extremely intensively absorbed by the capillaries and vapors of the material 5 (the blotter effect), after which the dehydrated product, leaving contact with the rollers 1 and 2, is poured into the collection 11.

To detach from the surface of the rollers of the adhering particles, pullers are provided 13. made in the form of brushes with stiff short bristles.

Moisture, moving with the pores of the material 3 from the loading, pressing and expanding zones, is pressed by the rolls 9 and drained into collections 10.

Thus, in the proposed apparatus, the dewatering of suspensions to low final humidities is ensured by decanting excess free moisture, squeezing free moisture and removing film moisture from the particles by capillary absorption. Due to the sequential application of these three stages, the processing in the apparatus of high-moisture dispersed materials and suspensions intensifies the dewatering process, improves the quality of the product.

Claims (1)

The invention of the apparatus for dewatering suspensions containing parallel perforated coated with a porous elastic material rollers, feeder, collection dehydrated material, characterized by the fact. that, in order to intensify the dewatering process, it is equipped with pressure rollers mounted under the rollers, hollow conical elements with radial-spiral blades on the outer surface and radial partitions on the inner, and holes are made in the place of attachment of the radial-spiral blades. at ; i i; ; i i i t stLL. / Tg 1A-A fi & 2