SU1153419A1 - Device for separating crystals from parent solution - Google Patents

Description

The invention relates to the field of separation of heterogeneous liquid systems, namely, devices and apparatuses for separating suspensions, and can be used in chemical, microbiological, food and other related industries * A device for separating suspensions is known, which contains a cylindrical part of the body with a tangentially located branch pipe for introduction of suspensions, conical bottom and nozzles for the withdrawal of the clarified liquid and sludge *

The disadvantages of this device are incomplete extraction of the solid phase from the liquid and high moisture content in the sludge, which leads to low efficiency of the separation process *

The closest in technical essence and the achieved effect%

described is a device for separating crystals from the mother liquor, containing a perforated ¹ shell with a pipe for introducing the suspension and a continuous shell with a pipe—. lump for outputting the liquid phase, coaxially placed in the housing wheel with blades mounted for rotation, and a pipe.

The known device has the following disadvantages * Since during the operation the gas flow is not distributed over the entire height of the perforated ’shell, there is practically no separation of crystals from the mother liquor in its lower part. In addition, a zone is formed at the wall of the pipe that is not affected by the gas flow, and drops of the solution that fall on the external surface of the pipe flow down and are removed together with the crystals * All this leads to an incomplete

Sign 1153419

3

four

the separation of crystals from the mother liquor, which reduces the efficiency of the device operation *

The aim of the invention is to increase efficiency by reducing the humidity of the crystals *

This del is achieved by the fact that the known device for separating the crystals ^{of the} cooling solution ⁴ , comprising a housing with perforated and solid shells coaxially placed therein and branch pipes for introducing the suspension, removing the liquid phase and the crystals, is provided with a drum with a perforated side surface and the holes in the bottom end mounted concentrically inside the perforated shell with the possibility of rotation.

The drawing schematically shows the proposed device, the cut.

The device contains a perforated flap 1, ending in the lower part with a solid nozzle 2, in the upper part of which a conical shell 3 is fixed with a lid 4 and a nozzle 5 for introducing the suspension. In the lid 4c, an engine “6” is mounted, which drives a hollow perforated drum 7 with holes in the bottom end: 8 * A continuous shell 9 is attached to the inner perforated side wall and both of them are enclosed in the upper body 10 and the bottom side cover 12. To the bottom cover 12 is attached * tapered pipe 13 for unloading crystals. The removal of the mother liquor through the nozzle 14.

Device for separating crystals from the mother liquor works as follows.

The original suspension through the nozzle 5 45 is fed into the conical shell 3 and flows by gravity into the gap between the inner perforated shell 1 and the rotating perforated drum:? · The air is twisted by the rotating perforated drum _ 7 and passing through the holes in the shell 1, picks up the suspension, ~ Toraya also acquires a swirling vortex motion. Forming

ten

20

25

thirty

1153419 '

the centrifugal force during the rotation of the gas-liquid flow creates an increased pressure at the wall of the shell 1, due to which the liquid phase is forced through the holes, is collected in the barrier 9, from where it is discharged through the fitting 14. As the drum 7 rotates, there are no stagnant zones at its surface , falling on it, breaks down and discarded to the perforated shell 1, and does not flow down. Due to the fact that the drum 7 is perforated, the gas output goes through its entire height. Since the drum 7 rotates and the gas is released throughout its height, the separation of the liquid phase from the crystals is also carried out along its entire height. As a result, the humidity of the final product decreases. Part of the air passes along with the liquid through the inner perforated shell 1, getting into the shell 9, then goes out in the upper part of the shell 9 and enters the space between its wall and the walls of the core 10 and the covers 11, 12. Hence the air through the passage between the lower cover 12 and the nozzle 2 of the perforated shell is sucked through the holes in the lower end 8 into the drum and then twists again. Another part of the air flow passes between the perforated shell 1 and the drum ‘7 and is sucked inside the drum 7 through the holes in the bottom end: 8. The air flow closes. The separated crystals slide down along the walls of the perforated shell 1 and are discharged through the conical parapipe 12, and the mother liquor is removed through the nozzle 13.

The use of the invention allows to increase the efficiency of the process of separation of crystals from the mother liquor. In a laboratory model of the device with a perforated drum diameter of 80 mm and a perforated shell diameter of 120 mm, the flow rate of the clarified mother liquor is

• • put 600 l / h, and the moisture content of potassium salt crystals was not higher than 2.5% (in the prototype 6%). Initial
• • solid phase concentration of 10 wt.%.

35

40

50

55

1 153419

I

Crystals

Claims (1)

A device for separating crystals from the mother solution, comprising a housing with perforated and solid shells coaxially placed in it and branch pipes for introducing slurry, draining the liquid phase and crystals, in order to increase the efficiency of operation by reducing the humidity of the crystals, the device is equipped with a drum with a perforated side surface and holes in the lower side of it, mounted concentrically inside the perforated shell rotatably *