SU1660714A1 - Thin-film thickener - Google Patents

Abstract

The invention relates to devices for the separation of suspensions, can be used in the chemical, mining and other industries and can increase productivity, improve the quality of the finished product and reduce its loss. The thin layer thickener contains a tank 1 with sloped plates 3 placed inside, a device 2, 4 for withdrawing condensed sediment and a clarified solution, respectively, 4, a suspension inlet device made in the form of a set of tubes 5 located between the plates 3 with outlet nozzles 6 directed downwards at an angle 40 - 60 degrees to the plates 3 at a distance of 0.2 - 0.6 of the length of the plates 3 from their lower edge. The plates 3 are located at different angles to the vertical, increasing from the center to the periphery by the angle between the adjacent plates, determined from the condition δ = 2 (90 ° - 90) / N + 1 ≤ 8 °, where deg: N is the number of sloping plates. 1 il.

Description

The invention relates to devices for the separation of suspensions and can be used in chemical, mining and other industries.

The aim of the invention is to increase productivity, improve the quality of the finished product and reduce its losses.

i The drawing shows a thin layer thickener, a general view,

A thin layer thickener contains a capacitor Bone 1, which narrows in the lower part and ends with a condensed sludge 2 output device. Inside the container 1 there is a package of inclined plates 3 placed symmetrically relative to the central axis, and the plates 3 are located at different angles to the vertical increasing from the center to the iberiphery by an angle of inclination 6 between adjacent plates, determined from the condition

(5 2 (90Р-а) / п,

Additional cleaning of the clarified solution in the upper part of the tank 1 is based on the use of some features of the hydrodynamics of precipitation movement and

liquid phases. The implementation of the inclined plates 3 with different angles to the vertices is associated with the formation of channels that expand along the motion of the liquid phase, and with the interaction of flows at the exit of the channels. Expansion of the channels provides an increase in the residence time of the particles in them, which, in the laminar mode, contributes to the intensification of the separation process. In this case, the angle of inclination d between two

adjacent plates 3 impose two limitations. The first of these is due to the fact that the loss of stability of the flow, which worsens the condition for the deposition of solid particles, occurs at. increasing angle

slope q between plates 3 more than 8 °.

Another limitation is the need to maintain the angle of inclination of each plate 3 larger than the angle of repose of the solid sediment. This condition is equivalent to the requirement

thirty

de a-angle-natural slope sediment, glad;

n is the number of inclined plates.

In the upper part of the tank 1, there is a device for outputting the clarified opening 4. In the space between the inclined plates 3 an input device is placed Suspension, made in the form of a set of pipes $ with outlet nozzles 6 directed downwards at an angle of 40-60 ° to the plates. The discharge nozzles 6 are located at a distance of 0.2-0.6 of the length of the plates 3 from their lower edge.

The device works as follows, .40

The initial suspension is fed through pipes 5 and enters the thickener through bypass nozzles 6. A coarsely dispersed part of the solid particles is deposited on the plates 3 under the action of gravity, and the sediment moves along the plates 3 in the direction of the device for the extraction of the thickened sediment 2. The bulk of the solid particles are deposited on the surface of the inclined plates 3 above the level of the nozzles 6, and as they move downward, the sediment formed by them crosses this level. The clarified solution with an insignificant amount of the fine product enters the upper part of the tank 1 where Ov is cleaned further, and then the solution is removed from the device through the device for removing the clarified solution 4.

0

°

0

v

(90р-а) / п +1,

where d is the angle of inclination between adjacent plates, hail;

a - angle of repose sediment, hail;

n is the number of inclined plates.

The angle of inclination d between adjacent plates 3 is determined by the smaller of the above values.

In addition, expansion of the channel also has an effect on the process of additional cleaning of the solution at the exit of the channels between the plates 3. In a parallel flow, all particles removed from the channels between the plates 3 are entrained in the solution. The expansion of the channels leads to the creation of curvilinear flows that form unstable vortices with the backward motion of solid particles. At appropriate opening angles, part of the solid material is returned to the upper part of the channel, where they are deposited on the surface of the inclined plate 3. The proposed device ensures a reduction in the loss of the finished product.

Claims (1)

Claims of the Invention A thin layer thickener containing a container with inclined plates placed inside, devices for injecting a suspension, withdrawing a thickened precipitate and a clarified solvent, distinguishing so that, in order to increase the production and distance the quality of the finished 0.2-0.6 lengths of plates from their lower product and reduce its losses, gadgets, while the plates are located introduction of suspensions is made in the form of a set of different angles to the vertical, uvelitrub, located between the inclined 5 from the center to the periphery on plates, with exhaust nozzles, on the angle of inclination d between adjacent plastipravlennymi down at an angle of 40-60 ° to the planes, equal to 2-8 °.