RU2622970C2 - Pulp conditioning device - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: pulp conditioning device includes a cylinder-conical separating chamber with a tangentially disposed pulp inlet and a discharge port for withdrawing the coarse pulp fraction located in the conical part of the separation chamber and the pulp separator, a mixing chamber disposed in the cylindrical portion of the pulp separator connected by a branch pipes to an overflow chamber, Located on the bottom of the pulp separator. The device is provided with a hollow cylinder, inside of which there is the rotative axis, consisting of the upper and lower axes connected by crosses. The lower rotative axis is fixed in the support bearing, installed on the bottom of the overflow chamber, which has the form of a truncated cone with an angle of inclination of 20-30°. In the upper part of the separation chamber cylinder, the blades which are rotatable due to the tangential flow of the pulp and assembled into the wheel are fixed on the spokes. On the outer side along the length of the cylinder, the pins are helically welded, and in the mixing and outflow chambers the screw blades are welded for mixing. The truncated cone of the outflow chamber is closed by a rotating protective casing fixed to the lower rotative axis. The branch pipe for feeding the reagent is installed with the possibility of tangential feed of the reagent in parallel with the flow of pulp feed in the lower zone of the blades assembled into the wheel.

EFFECT: increase in the contact time of the reagent with the pulp particles, uniform mixing of the pulp, decrease in energy consumption and reagent consumption.

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Description

The invention relates to the beneficiation of minerals by the flotation method, in particular, to devices for preparing pulp for the flotation process, and can be used in the processing of ore and non-metallic materials.

A known apparatus for conditioning pulp [1], including a vertically mounted cylindrical body, in the upper part of which is attached a pipe for the introduction of pulp, below which is installed a pulp distributor. A device is installed under the distributor for converting the pulp stream into a jet system. It consists of a truncated cone attached with a large base to the body, and a smaller one facing down, and several ring elements having a cross section in the form of a dihedral angle, facing upward, located at different levels in height. The radius of the ring elements decreases from top to bottom. Under the elements, a system of coaxial cylinders is installed (mounted vertically parallel to each other), equipped with inclined elements installed in the gaps between the cylinders and attached alternately in height to the walls of the cylinders and the inner surface of the housing. Guide ring elements are attached to the lower edges of the cylinders, having a cross-sectional shape of a dihedral angle facing upward. Under the elements, devices for supplying a flotation reagent in the form of an aerosol made in the form of nozzles are installed. A pulp outlet pipe is attached to the bottom of the housing, and a gas outlet pipe is attached to the cover. It is possible instead of annular guiding elements to use crescent-shaped guiding elements mounted along a helical line at the ends of the cylinders. The pulp flow distributor consists of a disk and a ring mounted under it. The outer radius of the ring is greater than the radius of the disc, and the inner radius of the ring is smaller than the radius of the disc.

The disadvantage is the complexity of the design when dividing the stream in jets.

A device for contacting a flotation pulp with reagents [2], which includes a cylindrical body with a drive shaft rotated by an electric motor with a gearbox. A mixing device made of two parts is placed on the drive shaft. The first part is located on the lower end of the drive shaft and is a helical blade made with a decreasing angle of inclination of the helix with the transition to a flat sector perpendicular to the axis of the shaft. The arc of the flat sector with which the helical blade ends is taken equal to 90 °. On the rest of the shaft, the second part of the mixing device is located, made in the form of pins made of pipes, which are arranged along a helical line with a downward slope and are welded to the shaft at an angle of 45 °. The device is equipped with a receiving pipe mounted at an angle to the housing, and a discharge device.

The disadvantage of this device is the additional energy consumption.

The closest technical solution adopted for the prototype is a device for conditioning flotation pulp [3], including a separation chamber of a cylindrical shape with a tangentially arranged pipe for supplying pulp and a discharge opening for the removal of coarse-grained pulp fractions installed in the conical part of the separation chamber, a reagent chamber, a drain chamber, located coaxially in the cylindrical part of the separation chamber, connected by a discharge drain pipe with a mixer fra pulp section with a bottom, a pulp divider located under the separation chamber, in which a pulp fraction mixer and an axisymmetric cochlear nozzle are placed, characterized in that, to increase the efficiency of the conditioning process due to the selective processing of pulp fractions of various sizes by reagents, it is equipped with a distribution cone mounted on the bottom mixer pulp fractions, the discharge drain pipe is located inside and coaxially dividing the chamber, forming an annular with the conical part of the chamber an opening for removing the coarse fraction, with its upper end inserted in the drain chamber, and a lower end coupled to an axisymmetric nozzle ulitkoobraznoy fastened on the distributor cone.

The disadvantage of this invention is the static mixing.

The objective of the invention is to increase the contact time of the reagent with pulp particles, uniform mixing of the pulp, reducing energy consumption and reagent consumption.

The solution to this problem is achieved by the fact that the device is equipped with a hollow cylinder, inside of which there is a rotation axis, consisting of upper and lower axes connected by crosses, while the lower rotation axis is fixed in the support bearing mounted on the bottom of the drain chamber, having the shape of a truncated cone with an angle tilt 20-30 °, and in the upper part of the cylinder of the separation chamber on the spokes fixed blades assembled in a wheel made with the possibility of rotation due to the tangential flow of the pulp on the outside of pins are screw-welded along the cylinder length, and screw blades for mixing in the mixing and drain chambers, while the truncated cone of the drain chamber is closed by a rotating protective casing fixed to the lower axis of rotation, and the reagent supply pipe is installed with the possibility of reagent supply parallel to the pulp feed stream lower zone of blades assembled in a wheel.

The operation of the device is illustrated in the drawing, which shows a section of a device for conditioning pulp.

The following conventions are adopted in the drawing: 1 - separation chamber, 2 - pulp supply pipe, 3 - coarse-grain fraction bypass gap, 4 - reagent supply pipe, 5 - mixing chamber, 6 - slurry divider, 7 - drain pipe, 8 - drain chamber, 9 - thrust bearing, 10 - lower axis, 11 - upper axis, 12 - bearing, 13 - hollow cylinder, 14 - spoke, 15 blade, 16 - pins, 17, 18 - screw blades, 19 - bottom of the drain chamber, 20 - outlet windows of the mixing chamber, 21 - protective casing.

The pulp under pressure of 0.1-0.3 MPa through the tangential pipe 2 enters the separation chamber 1, the pulp stream acquiring a rotational movement, acting on the blades 15, rotates it and makes the hollow cylinder 13 rotate due to the spokes 14, on the outside of which are welded along the helix, the pins 16, creating turbulence in the separation chamber 1, which prevents the rapid deposition of suspended particles, which lengthens the time of their contact with the reagent, and in the mixing 5 and drain 8 chambers screw blades 17 and 18, respectively, which accelerate t discharge chambers, as well as a protective casing 21, which protects against ingress of solid particles in the slurry thrust bearing 9.

Large particles of the pulp when exposed to the blades 15 lose energy and slide along the walls of the separation chamber 1 beyond the blades 15, where the reagent is fed tangentially parallel to the nozzle 2 through the nozzle 4, small particles are picked up by the reagent and carried up and due to centrifugal force to the center of the separation chambers, from where they fall into the hollow cylinder 3, inside of which they settle into the drain chamber 8, where they are additionally mixed by screw blades 18 with large particles and by the walls of the cones 19 and 21 are transferred to nym nozzles 7.

Large particles are mixed with the reagent and through the discharge opening 3 enter the mixing chamber 5, where they are additionally mixed with screw blades 17 and through the discharge windows 20 and / or overflow enter the drain pipes 7.

The technical result is an increase in the contact time of the reagent with the pulp particles, uniform mixing of the pulp, a decrease in energy consumption and reagent consumption.

List of sources used

1. RF patent No. 2106718. Apparatus for conditioning pulp. IPC B03D 1/14. Patent. DOAO "GINCVETMET Institute". Authors: Zhilin VV Korshunov V.V., Shestovets V.Z., Levman A.K., Chernykh S.I. Claim 01/19/2000. Publ. 05/27/2001.

2. RF patent No. 2167718. Device for contacting flotation pulp with reagents. IPC ⁵ B03D 1/14. Patent. CJSC Uryupsky GOK. Authors Konov H.K., Morozov N.A., Chernykh S.I. Claim 05/15/01. Publ. 05/10/01.

3. RF patent No. 1662050. A device for conditioning flotation pulp. IPC B 03D 1/14. Patent. KuzNII "Coal beneficiation". Authors: L.A. Antipenko, A.G. Leiger, B.C. Krasitsky et al. 04/25/88.

Claims (1)

A device for conditioning the pulp, comprising a separation chamber of a cylindrical shape with a tangentially arranged nozzle for supplying pulp and a discharge opening for discharging the coarse-grained fraction of the pulp, located in the conical part of the separation chamber and the slurry divider, a mixing chamber located in the cylindrical part of the pulp divider, connected by nozzles to a drain chamber, located on the bottom of the pulp splitter, characterized in that the device is equipped with a hollow cylinder, inside which there is a The rotation axis consisting of the upper and lower axes connected by crosses is mounted, while the lower rotation axis is fixed in a support bearing mounted on the bottom of the drain chamber, having the shape of a truncated cone with an angle of inclination of 20-30 °, and in the upper part of the cylinder of the separation chamber the blades are fixed to the spokes, assembled into a wheel made with the possibility of rotation due to the tangential flow of pulp, pins are screw-welded on the outer side along the length of the cylinder, and screw blades for mixing in the mixing and drain chambers Shivani, wherein the truncated cone overflow chamber closed rotary shroud fixed to the lower rotation axis and for supplying reactant nozzle is mounted for tangential feed reactant flow parallel feed pulp in the bottom zone of blades assembled in a wheel.

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