SU1430056A1 - Thin-layer thickener - Google Patents

Abstract

The invention relates to the separation of suspensions and can be used in the enrichment of minerals, in the chemical industry and in the treatment of waste water from mechanical impurities. The purpose of the invention is to increase the degree of clarification of the liquid during continuous operation of the thickener - due to the fact that the thickener includes a housing 1 with a device 2 for distributing water, nozzles 4 and 6, respectively, for withdrawing sediment and clarified water; inside the case there are hollow sloped shelves 7 with precipitating platforms 8, interconnected perforated plates 9, covered with a porous material. The proposed implementation of inclined plates significantly reduces the likelihood of driving a porous material and creates conditions for the continuous operation of the thickener. 2 Il.

Description

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The invention relates to the separation of suspensions and can be used in the enrichment of minerals, in the chemical industry and in the treatment of wastewater 4 tons of mechanical impurities.

The purpose of the invention is to increase the degree of clarification of the liquid during continuous operation of the thickener.

FIG. 1 shows the proposed device, a vertical section; in fig. 2 — node I in FIG. one.

i The thin layer thickener comprises a housing 1, a receiving switchgear 2, a silo 3 for sludge with a discharge pipe 4, a drain chute 5 with a pipe 6, hollow inclined shelves 7 with sedimentary platforms 8 connected together between a perforated plate and 9, porous material 10 (filter fabric), collector 11, separating inclined shelves 12 and discharge pockets 13 for sludge.

Thin layer thickener works as follows.

The original pulp through the receiving distributing device 2, made in the form of a perforated pipe, enters the channels between the inclined hollow shelves 7. Solids under the influence of gravity are deposited on the upper surface of the inclined shelves 7, consisting of separate precipitation platforms 8. On the shelves, the sediment layer moves downwards, moving along the precipitation platforms. In this case, zones filled with liquid released from the sediment layer are formed near the porous plates 9. The liquid from these zones is filtered through a porous material placed on the plates 9 due to the difference in hydrostatic pressures on both sides of the porous material, due to the difference in the densities of water inside the hollow shelves and the slurry in the inter shelf space. A similar process takes place on the lower perforated surface of the inclined shelves, which is also covered with a porous material. The fluid passing through the porous material moves upward inside the hollow shelves and

output through the collector 11 to the clarification zone and then through the drain threshold into the chute 5. Sediment from the inclined shelves through the pockets 13 is discharged into the storage hopper 3 and withdrawn from it through the nozzle 4. to prevent the slurry being discharged from the shelves from flowing with the initial pulp. separating shelves 12 mated to the pockets 13. In the proposed device, compared with the prototype, a higher degree of clarification of the liquid is achieved during its continuous operation. This is due to the fact that the porous material works as a filter septum equally effectively on both sides of the inclined shelves. In particular, the effective operation of the porous material on the upper surfaces is achieved by placing it on perforated partitions having a slope opposite to the slope of the shelves. As a result, solid particles do not precipitate directly on the porous material and do not move downward along it, which significantly reduces the likelihood of driving the porous material and creates conditions for continuous

work thickener.

A thin layer of thickener, all other things being equal, allows an increase in the degree of clarification of water by 2-3% compared with existing types of such devices.

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Claims (1)

Invention Formula 0 A thin layer thickener, comprising a housing with an inlet distributor for the initial suspension, branch pipes for withdrawing the condensed product and a clarified liquid, hollow inclined shelves arranged in the housing, the lower surface of which is made perforated and covered with a porous material, characterized by hem. the walls of the clarification of the liquid during the continuous operation of the thickener, the upper surface of the inclined shelves is made of separate platforms installed stepwise and interconnected tinami, wherein the perforated plate and covered with a porous material. // jo eight GO CPUS. 2