RU2547872C1 - Device for pumping froth product of flotation processing - Google Patents

Abstract

FIELD: mining operations.

SUBSTANCE: device for pumping froth product of flotation processing comprises a sump and a pump. The sump is made in the form of a conical container with tangential inlet of froth product and an outlet of pulp into the pump and is provided with nozzles for input of froth product and for connecting to the pump. The bottom of the conical container is its smaller base. In the centre of the container bottom there is a truncated cone, mounted with the smaller base upwards. On the inner side surface of the conical container the lining is located, having protrusions, made of wear-resistant material. The lower side of the lining is located at the level of the upper base of the truncated cone located in the centre of the sump bottom, and on the centre of the sump, at a distance from the bottom, equal to 0.5÷0.7 the height of the sump, an open paddle wheel is mounted, with the upper and lower paddle arrangement. The direction of rotation of the paddle wheel coincides with the direction of rotation of the pulp flow. The nozzle for input of froth product is located above the lower edges of the wheel paddles. The protrusions have a variable width in height of the lateral surface of the conical container of the sump, at that the width of the protrusion in the upper part is 3÷5 times greater than the width in its lower part.

EFFECT: increased efficiency, productivity of operation of the device for pumping the froth product for flotation processing, and reduction of energy consumptions.

2 cl, 3 dwg

Description

The invention relates to the field of mineral processing and can be used in the flotation of non-ferrous, ferrous, rare and noble metals, as well as non-metallic minerals. It is known that when foam flotation is present in the manufacturing process, one has to deal with such a problem as transportation of flotation foam.

Flotation foam is a three-component system in the form of resistant to destruction of bubbles, which consists of particles of ore, water and air. When bubbles pass through the pump, they are destroyed and air accumulates in the region of the impeller. Thus, an air cavity is formed, as a result of which the contact of the surface of the impeller with the pulp is reduced.

Pump performance gradually decreases, the pulp level in the supply tank rises, and the pressure at the suction port of the pump rises, until it becomes sufficient to push the air plug.

Such a cyclic mode of operation can lead to overfilling of the supply tank, and therefore, to the loss of a valuable component or its contamination, as well as to a decrease in pump performance, which can disrupt the process.

The presence of air in the pulp creates difficulties in choosing the appropriate size of pumping equipment and engine power. To eliminate these difficulties, a number of special methods have been developed for calculating the reduction in the nominal performance of the pumps, depending on the amount of air in the pulp. However, the use of even such techniques in calculations is not a guarantee that the equipment is correctly selected. Sometimes it is possible to find out only after the pumping equipment is already installed and put into operation. In the best case, the equipment will work with reduced performance indicators; in the worst case, it will be necessary to replace the equipment with a new one.

A device for pumping a foam product containing a sump and a pump is known, the sump is equipped with nozzles for introducing a foam product and for connecting to a pump (RU, Patent No. 225,564, class B03D 1/02, 2003).

The known device is placed in the technological scheme for flotation concentration of minerals.

A disadvantage of the known device is the low efficiency of its operation, due to air bubbles entering the pump with the foam product and the resulting instability of pressure, which leads to a decrease in its performance and the possibility of breakage, as well as to overflow of the foam product over the edge of the sump, and therefore, loss of valuable component or its contamination, which will also lead to loss of productivity and increased energy consumption to maintain the health of the device.

Ultimately, these shortcomings lead to disruption of the entire process in which this device is involved.

The closest in technical essence and the achieved result is a device for pumping the foam product of the flotation redistribution, containing a sump and a pump, the sump is made in the form of a conical tank with tangential inlet of the foam product and the discharge of pulp into the pump and is equipped with nozzles for introducing the foam product and for connecting to the pump , the bottom of the conical tank is its smaller base, and in the center of the bottom of the tank is a truncated cone installed with the smaller base up (RU, application for invention No. 2014103407 / ....... (005278), dated January 31, 2014, CL B03D 1/02, 2003).

A disadvantage of the known device is the low efficiency of its operation, due to the low kinetic energy of the foam product stream and, as a result, the effect of the destruction of air bubbles, which reduces the pump performance for pumping the foam product and can lead to its breakdown.

The technical result to which the present invention is directed is to increase the operating efficiency and increase the service life of the device for pumping the foam product due to the fact that the small kinetic energy of the pulp stream is communicated with additional rotational movement inside the conical container, which increases the flow energy and contributes to a more efficient the destruction of air bubbles, which in turn allows to increase the productivity of the pump for pumping foam product.

The specified technical result is achieved by the fact that in the device for pumping the foam product of the flotation redistribution, containing a sump and a pump, the sump is made in the form of a conical tank with tangential inlet of the foam product and the discharge of pulp into the pump and is equipped with nozzles for introducing the foam product and for connecting to the pump, the bottom of the conical tank is its smaller base, and in the center of the bottom of the tank there is a truncated cone installed with the smaller base up, according to the invention, on the inner side surface a lining with protrusions, made of wear-resistant material, the lower side of the lining is located at the level of the upper base of the truncated cone located in the center of the bottom of the sump, and in the center of the sump, at a distance from the bottom of 0.5 ÷ 0.7 height sump, an open impeller is installed with an upper and lower arrangement of blades, while the direction of rotation of the impeller coincides with the direction of flow of the pulp, and the pipe for introducing the foam product is located above the lower edges molasses wheel.

In addition, the specified technical result is achieved in that the protrusions can have a variable width along the height of the lateral surface of the conical capacity of the sump, while the width of the protrusion in the upper part is 3 ÷ 5 times greater than the width in its lower part.

Figure 1 shows a vertical section of a device for pumping foam product flotation redistribution.

Figure 2 shows a top view of a device for pumping foam product flotation redistribution.

Figure 3 shows a section B-B of a device for pumping a foam product flotation redistribution.

A device for pumping the foam product of the flotation redistribution contains a sump 1 with a nozzle 2 for introducing a foam product and a nozzle 3 for connecting to a pump 4. The sump 1 is made in the form of a conical tank with a tangential inlet of the foam product and discharge of pulp into the pump 4, bottom 5 of the conical capacity of the sump 1 is a smaller base. In the center of the bottom 5 is a truncated cone 6, installed a smaller base up. The presence of a truncated cone 6 allows you to create a zone for uniform distribution of solid particles in the pulp for pumping. On the inner side surface of the conical tank of the sump 1 there is a plate lining 7 with protrusions 8 made of wear-resistant material, for example, elastomer (rubber, etc.), and the lower edge of the lining 7 is placed at the level of the upper base of the truncated cone 6 mounted on the bottom sump 1, which allows the flow of pulp to move freely to the pipe 3 for connection with the pump 4 (suction pipe), without creating deposits of solid particles. In the center of the sump 1, at a distance from the bottom equal to 0.5 ÷ 0.7 of the height of the sump 1, an open impeller 9 is installed with an upper and lower arrangement of the blades 10. The impeller 9 is connected to the intermediate shaft 11, which is attached to the drive unit 12 The torque of the impeller 9 is transmitted from the electric motor 13 via a V-belt drive. A pipe 2 for introducing a foam product is located above the lower edges of the blades 10 of the wheel 9.

The pipe 3 for connecting to the pump 4 (suction pipe) is located in the lower part of the conical tank of the sump 1 along the pulp stream, below the upper base of the truncated cone 6, which ensures the stability of the pulp flows at the inlet to the suction pipe 3 of the pump 4.

A device for pumping a foam product flotation redistribution works as follows.

Foam product flotation redistribution enters the pipe 2, installed tangentially forming the surface of the conical capacity of the sump 1.

Due to the conversion of the potential energy of the flow into kinetic, the foam product is twisted, and the rotary open wheel 9, rotating in the direction of flow, increases the speed of rotation of the flow. Air bubbles carrying particles of useful minerals are discarded under the action of centrifugal force to the internal surface of the sump 1 with a lining 7 with protrusions 8 located on its lateral surface, creating vortex cavitation flows that destroy air bubbles. The lining 7 with the protrusions 8 is made of a wear-resistant material, for example, from an elastomer (rubber, etc.).

Particles of useful minerals under the action of gravity sink to the bottom of sump 1.

With the destruction of the foam, two phases are formed. The liquid phase with mineral particles, the flow of pulp is directed to the suction tangentially installed pipe 3 of the horizontal pump 4.

The gas phase is removed from the open surface of the sump 1.

The presence of a truncated cone 6 at the bottom of the sump 1 allows you to create a zone for uniform distribution of solid particles in the pulp for pumping.

The choice of installing an open impeller with an upper and lower location of the blades at a distance from the bottom equal to 0.5 ÷ 0.7 of the height of the sump is due to the fact that the foam product rotates relative to the vertical axis of the sump with a constant and identical angular velocity for all its parts, forming parabolic open upper surface. The height of the paraboloid of surface rotation does not exceed 0.5 ÷ 0.7 of the depth of the paraboloid of the open surface. In this case, the impeller will always work in the environment of the foam product and further destroy the foam bubbles.

The placement of the pipe 2 for introducing the foam product above the lower edges of the blades of the wheel 9 is due to the fact that the peripheral flow rate increases by the flows formed by the rotating impeller 9.

The presence of the lining 7 with the protrusions 8 provides the creation of vortex cavitation flows, contributing to the most efficient destruction of air bubbles, which in turn allows to increase the productivity of the pump for pumping foam product and prevent its breakdown, which in turn provides increased productivity and efficiency of the device and increases the life service. The lining of wear-resistant material also allows to increase the service life of the device.

Thus, the proposed device for pumping the foam product of the flotation redistribution, using the kinetic energy of the foam product stream and the energy of the stream formed by the rotating impeller 9, allows more efficient removal of air bubbles from the foam product and stabilizes the horizontal pump by preventing air bubbles from entering the pump , which in turn will help stabilize the pressure, prevent the loss of a valuable product due to overflows over the edge of the sump and reduce sweat eblenie power and hence increase the efficiency, reliable operation of the device and increase its life by preventing the breakage of the pump.

A device for pumping the foam product of flotation redistribution can be installed in any technological scheme for flotation concentration of minerals in which foam flotation is used to reduce energy consumption, increase productivity, increase reliability and improve its performance by preventing a decrease in productivity or even pump failure , which will lead to disruption of the entire process.

Claims (2)

1. A device for pumping foam product flotation redistribution, containing a sump and a pump, the sump is made in the form of a conical tank with a tangential inlet of the foam product and the discharge of pulp into the pump and is equipped with nozzles for introducing the foam product and for connection with the pump, while the bottom of the conical tank is its smaller base, and in the center of the bottom of the tank there is a truncated cone installed with the smaller base up, characterized in that a lining with protrusions is placed on the inner side surface of the conical container made of wear-resistant material, while the lower side of the lining is located at the level of the upper base of the truncated cone located in the center of the bottom of the sump, and an open impeller is installed in the center of the sump, at a distance from the bottom equal to 0.5 ÷ 0.7 of the height of the sump with the upper and lower arrangement of the blades, while the direction of rotation of the impeller coincides with the direction of rotation of the flow of pulp, and the pipe for introducing the foam product is located above the lower edges of the blades of the wheel. 2. The device for pumping the foam product of the flotation redistribution according to claim 1, characterized in that the protrusions have a variable width along the height of the lateral surface of the conical capacity of the sump, while the width of the protrusion in the upper part is 3 ÷ 5 times the width in its lower part.

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