SU1022720A1 - Radial thickener - Google Patents

Description

The invention relates to the field of mineral enrichment, namely, radial thickeners, and can be used in the mining, chemical, coal and other industries. Known radial thickener, STATUS1 of a cylindrical tank with a conical bottom, a movable load and distribution device with annular and radial grooves, with unloading sediment at the bottom of the thickener from radial grooves, rowing mechanism, devices for removing sediment and draining Li. the essence and the achieved result of the invention is a radial thickener containing a tub of a cylindrical shape with a conical bottom, a movable loading and distribution device with ring and radial grooves, a rowing mechanism attached to the plate strokes with holes communicating with the radial grooves, devices for removing sediment and draining f2. The disadvantage of these radial thickeners is that when the product is fed from the radial grooves to the bottom of the thickener, air contained in the starting product is trapped in the lower part of the thickener, resulting in turbulent flows when air bubbles float, which disrupts the particle deposition process. degrades the separation efficiency and reduces the performance of the thickener. As a result of the movement of air bubbles from the bottom to the liquid mirror, flotation of small particles occurs, and Jena is formed on the liquid mirror, including a valuable component. When liquid is destroyed by the foam, additional perturbing flows are formed, which violate the stability of the flows in the thickener, adversely affect the deposition process and, thereby, increase the loss of the valuable component with the discharge. In addition, a slight cross-section of the pipes prevents the thickener from feeding the product at DNIC6 at low speeds, which leads to sedimentation of sediment at the bottom of the thickener and, thus, worsens the separation process. It should be noted that the frontal resistance of the pipes during their movement in the thickener creates disturbing flows, which also worsen the conditions for the deposition of particles and reduce the productivity of the thickener as a whole. The aim of the invention is to improve the conditions for the deposition of particles and to increase the efficiency of the use of the radial thickener due to the preliminary release of air from the original product and stabilization of the flow in the thickener. The goal is achieved by the fact that the thickener is provided with foamy chutes attached to the annular chute and to both sides of the radial chutes, while the overflow edges of the latter are located above the overflow edges of the annular and radial chutes. In addition, the distributor tubes are made in the form of hollow pylons that have a cross section shape streamlined wing. At the same time, in order to prevent foam from penetrating into the central bearing of the drive of the comb-frame, the thickener is also provided with a cylindrical shell attached to the bottom of the annular groove, the lower end of which is located below the overflow edge of the collecting tray. FIG. G shows a radial thickener, longitudinal section; in fig. 2 - the mobile loading and distributing device with the collection of foam, top view; in fig. 3 is a section A-A in FIG. 2; in fig. A - possible embodiments of the pylon cross section; in fig. 5 is a point where pylons connect with plates in perspective view. The radial thickener consists of a tub 1 of cylindrical shape with a conical bottom, a movable loading and distributing device with annular and radial grooves 2 and 3, respectively, rows 4, attached to the strokes of plates 5 with holes 6, foamy grooves -7 located on both sides of the radial gutters 3, and the annular chamber 8 communicated with them for collecting the foam formed by the cylindrical shell 9 and the annular chute 2, the diameter of which is larger than the diameter of the ring ring. The lower end of the cylindrical shell 9 is located below the level of the overflow board to drain the drain. The outer wall of the annular groove 2 and the inner wall 10 of the radial grooves 3 are provided below the level of the outer walls of the foam grooves 7 and the inner wall of the annular groove. The cavities under the plates 5 through the holes 6 communicate with radial and foam chutes by hollow pylons 11, having a streamlined shape in cross section, for example, in the form of a streamlined wing. The cross-sectional shape of the pylons may be of another streamlined shape (FIG.). On the bottom of the annular gutter 2, the annular shell 12 is concentrically reinforced, the lower end of which is located below the level of the overflow board for draining. Devices 13 and 1 are provided for the withdrawal of sediment and drain, and a device for radial foaming of the foam in the annular chamber 8 is provided. The radial thickener works as follows. The source product is fed into the annular chute 2, spreads over the radial chutes 3 and enters the pylons 11. A sufficiently large cross section of the pylons reduces the flow rates of the original product, causing the air contained in it to move upwards, capturing fine particles of solid material that leads to the formation of foam, which is passed over into the foam chutes 7 and further into the annular chamber 8. The foam that forms in the annular and radial grooves, rolls over the outer wall of the annular chute 2 and the inner walls 10 for the sake of The gutters also enter the annular chamber 8, where it is irrigated with liquid midway through device 15. The liquid droplets destroy the foam, as a result of which partial materials separated from the foam are deposited in the central zone of the thickener, in which there are no ascending streams. After the release of air in the pylons 11, the product enters through the holes 6 under the plates 5 and is evenly distributed over the bottom of the thickener, while the pylons 11, having a streamlined shape in cross-section, perform the functions of flow stabilizers throughout the thickener, which also improves the conditions of particle deposition . The paddles k transport the sediment formed on the bottom of the thickener to the sludge extraction device 13, and the discharge is discharged through the device H ,. An advantage of the invention is to increase the efficiency of using a radial thickener, to improve the conditions for particle sedimentation by stabilizing the flows in the thickener while reducing losses with the discharge of the valuable component due to pre-release of air from the original product, before feeding the latter to the bottom of the thickener. At the same time, the occurrence of turbulent flows that form when bubbles bubble up is eliminated, which significantly improves the conditions for the deposition of particles. In the annular chamber, the collected foam is irrigated with Liquid, as a result of which Foam is destroyed and small particles containing,., EC in it,. the h-central zone of the thickener, not the upflows. At the same time, there is no effect on the deposition of particles coming from the loading device to the bottom of the thickener, and, therefore, the loss of the valuable component with the discharge decreases. In addition, due to the large cross section of the pylons, the initial product enters the bottom of the thickener at lower flow rates, which is cKa3bH3aet with good on the process of sedimentation of particles. The streamlined profile of the pylons allows the latter to perform the functions of flow stabilizers in the thickener along its volume, which also improves the conditions for the deposition of particles, increases the productivity of the thickener, and increases the efficiency of its use as a whole. The invention can be used in radial thickeners used to separate various suspensions, for example, a flotation concentrate of phosphate ores.

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Claims (3)

(577 1. THICKENER, comprising a cylindrical conical bottom housing, a rotating source fluid distributor with annular and radial grooves and pipes, a rowing mechanism, a collection tray for draining and a sediment removal unit, characterized in that, in order to increase the efficiency of use due to preliminary air separation from the initial product and stabilization of currents in the thickener, it is equipped with foam ¹ gutters attached to the annular groove and to both sides of the radial grooves, while the overflow edges of the latter they are located above the overflow edges of the annular and radial grooves. 2. The thickener by π. 1, with the fact that the distributor pipes are made in the form of hollow pylons having a streamlined shape in cross section, for example, a streamlined wing. 3. The thickener according to claim 1, which is distinguished by the fact that it is equipped with a coaxially located attached. to the bottom of the annular groove with a cylindrical shell, the lower end of which. located below the overflow edge of the collecting tray.