RU2262986C2 - Hydraulic separator - Google Patents

Abstract

FIELD: separating solid materials.

SUBSTANCE: hydraulic separator comprises cylindrical housing with the lid and conical bottom, supplying sleeve, branch pipes for supplying suspension and discharging classified product, and drain. The hydraulic separator is also provided with mixing device and branch pipes for supplying washing fluid to the conical bottom. The mixing device is made of a vertical shaft arranged along the axis of the hydraulic separator whose bottom section is secured to the blades of the mixing device arranged in several rows with a spaced relation to the surface of the conical bottom. The supplying sleeve is made of a trancated cone whose greater base is directed upward to decrease the area of the cross-section of the top part of the hydraulic separator. The disk with the blades underlies the supplying sleeve and is mounted on the shaft common to that of the mixing device.

EFFECT: enhanced efficiency of the separator.

1 cl, 1 dwg

Description

The invention relates to equipment for the production of aluminum hydroxide and alumina and can be used in other industries where classification by size of the polydisperse solid phase of various suspensions is required.

A known apparatus for classifying particles by size (French Patent No. 2511894 from 08.31.81), comprising a vertical column in which horizontal perforated partitions are installed, devices for supplying the initial suspension, washing liquid and removing the treated suspension, as well as a pulsation device. The perforation coefficient of the plates is calculated based on the performance of the apparatus.

The disadvantages of the apparatus include:

- high specific energy intensity of the pulsating device;

- design complexity;

- the impossibility of processing suspensions of supersaturated solutions with the ability to precipitate on the inner surfaces of the classifier.

The closest in technical essence and the achieved effect to the claimed solution is an apparatus for classifying a suspension of aluminum hydroxide - hydroseparator (Handbook of non-ferrous metals. Production of alumina. M., "Metallurgy", 1970, p.266).

The hydraulic separator consists of a cylindrical body with a conical bottom and a flat cover. The suspension, directed to the classification, enters the apparatus through a supply cup mounted in the upper part along its axis.

The classified product is taken through the “discharge” pipe located at the bottom of the conical bottom, and the discharge through the pipe at the top of the cylindrical body. The disadvantages of this design of the hydroseparator should include a low degree of classification by size of the solid phase of the suspension.

This leads to the fact that in order to obtain the required amount of large particles in the classified product, it is necessary to reduce the selection of the suspension through the discharge pipe, i.e., ultimately, to reduce the performance of the hydraulic separator. In addition, a large number of small particles “aggregated” with large particles of aluminum hydroxide are carried away to the lower zone, to the discharge port.

The objective of the invention is to increase the classification ability of the hydroseparator and its productivity.

The technical result is achieved in that the hydroseparator for classifying particles of aluminum hydroxide suspension by size, including a cylindrical body with a cover and a conical bottom, a feeding cup, nozzles for supplying a suspension, draining the classified product and draining, is equipped with a mixing device and nozzles for supplying washing liquid to the conical the bottom, while the mixing device is made in the form of a vertical shaft mounted along the axis of the hydraulic separator, to the bottom of which with a gap to the surface These conical bottoms in several rows are fixed to the blades of the mixing device, and the supply cup is made in the form of a truncated cone, facing up with a large base to reduce the cross-sectional area of the upper part of the hydroseparator.

A disk with blades is mounted under the feed cup on a common shaft with a mixing device.

The drawing shows a diagram of the apparatus.

The hydraulic separator consists of a cylindrical body 1 with a flat cover 2 and a conical bottom 3. On the axis of the apparatus on its cover 2 is a drive 4 connected by a coupling 5 to the shaft 6. Elements 7 of a multi-row mixer are attached to the bottom of the shaft 6 with a clearance to the surface of the conical bottom 3 .

The suspension is supplied to the hydroseparator through a pipe 8 connected to a supply glass 9.

The supply cup 9 has the shape of a truncated cone, facing down with a smaller base. A disk 10 with blades 11 is mounted under the feed cup 8 on the shaft 6 of the multi-row mixer.

The classified suspension is removed through the pipe 12, draining through the pipe 13.

Between the planes of the arrangement of the elements 7 of the multi-row mixer, at least one pipe 14 for supplying liquid is cut into the conical bottom 3.

Simultaneously with the suspension being fed into the hydroseparator, the drive 4 connected to the multi-row mixer is switched on.

Disk 10 with blades 11, the suspension is distributed over the cross section of the cylindrical part of the hydraulic separator 11.

Large particles of the solid phase, the speed of which is higher than the speed of the upward flow of the continuous phase, settle down and accumulate in the lower part of the apparatus. At the same time, liquid is introduced into the conical part of the hydroseparator through the nozzle 14, which, with the help of the elements of the 7 multi-row mixer, is evenly distributed over its section and, moving upward, increases the speed of the ascending suspension current. This allows you to additionally "wash out" from the layer of condensed suspension, which accumulates in the lower zone of the hydroseparator, limited by the surface of the conical bottom 3, small particles of aluminum hydroxide and at the same time to widely control the speed of the upward flow.

The suspension, containing mainly small particles of the solid phase, moves upward to the discharge pipe 13. Moreover, as it moves upward, its speed continuously increases. This is due to a gradual decrease in the cross-sectional area of the upper part of the hydroseparator due to the configuration of the supply cup 9, made in the form of a truncated cone, facing down with a smaller base.

The classified suspension, containing mainly large particles of aluminum hydroxide, is removed from the apparatus through the pipe 12.

Claims (2)

1. A hydraulic separator for classifying particles of an aluminum hydroxide suspension by size, including a cylindrical body with a lid and a conical bottom, a feeding cup, nozzles for supplying the suspension, draining the classified product and draining, characterized in that it is equipped with a mixing device and nozzles for supplying washing liquid to the conical bottom, while the mixing device is made in the form of a vertical shaft mounted along the axis of the hydroseparator, to the lower part of which, with a gap to the surface of the conical bottom looking in several rows fixed blades of the mixing device, and the supply glass is made in the form of a truncated cone, facing up with a large base to reduce the cross-sectional area of the upper part of the hydraulic separator. 2. The hydraulic separator according to claim 1, characterized in that a disk with blades is mounted under the supply cup on a common shaft with a mixing device.