Automatic defoaming device for flotation concentrate

Abstract

The utility model relates to the technical field of coal washing, in particular to an automatic defoaming device for flotation concentrate, which comprises a concentrate barrel and a main pipeline, an electromagnetic valve is arranged on the main pipeline, the tail end of the main pipeline is connected with two branch pipes through a three-way pipe, the tail ends of the two branch pipes are connected with two vertical pipes through elbows, and the two vertical pipes are inserted into the concentrate barrel. A plurality of groups of water outlet holes are formed in the vertical pipe from top to bottom, each group of water outlet holes comprises four sub water outlet holes located in the same cross section of the vertical pipe, a liquid level meter is installed in the concentrate barrel and electrically connected with a controller, and the controller is electrically connected with the electromagnetic valve. According to the defoaming device, manual flushing and defoaming are not needed, the amount of water brought by manual flushing is reduced, meanwhile, compared with mechanical stirring type defoaming, the defoaming effect is good, and the production operation cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal washing, in particular to an automatic defoaming device for flotation concentrate. Background Art

[0002] Flotation technology is widely used in coal slime flotation and fly ash flotation. After the flotation pulp, air and reagents are fully mixed and mineralized, the concentrate is selected by the action of bubbles and reagents. The flotation concentrate carries a large number of microbubbles into the concentrate collection tank and flows into the concentrate barrel by gravity. When any of the parameters such as the amount of raw coal entering the washing, the amount of circulating water, and the amount of sanitary water changes, the concentration of the flotation pulp will change instantly. When the flotation reagent is not adjusted in time, the flotation concentrate often carries a large number of large bubbles into the concentrate collection tank and flows into the concentrate barrel by gravity. These microbubbles and large bubbles are difficult to break by themselves in the concentrate barrel, and some of them are combined into larger bubbles, resulting in more and more bubbles in the concentrate barrel, and even overflow, which brings troubles to the subsequent processing: the slurry conveying pump is prone to dust cavitation and severe wear; the filter press has a long feeding time, low filtration efficiency, and high moisture content in the filter cake.

[0003] Common defoaming methods in concentrate barrels in the prior art include: manual defoaming and mechanical stirring defoaming.

[0004] Manual defoaming: When the operator finds that the concentrate barrel has too much foam or is about to overflow, he will use a large amount of high-pressure water to wash the foam above the concentrate barrel. The shortcomings of this method are: (1) Manual defoaming is labor-intensive and inefficient; (2) It reduces the concentration of the flotation concentrate, and the filter press feed time is long and the efficiency is low.

[0005] Mechanical stirring defoaming: adding a motor, a reducer, and a main shaft above the concentrate barrel, and installing several horizontal defoaming rods perpendicular to the main shaft at a certain interval below the main shaft. The defoaming rods rotate at high speed and collide with the bubbles to achieve the purpose of defoaming. The shortcomings of this method are: (1) low defoaming efficiency and incomplete defoaming; (2) increased energy consumption and maintenance costs. Utility Model Content

[0006] In view of the technical problems of low defoaming efficiency and incomplete defoaming in the prior art, the utility model provides an automatic defoaming device for flotation concentrate, which does not require manual flushing and defoaming, reduces the amount of water brought in by manual flushing, and has a good defoaming effect compared with mechanical stirring defoaming, saving production operation costs.

[0007] The utility model provides an automatic defoaming device for flotation concentrate, which comprises a concentrate barrel and a main pipeline. An electromagnetic valve is arranged on the main pipeline. The end of the main pipeline is connected to two branch pipes through a tee. The ends of the two branch pipes are connected to two vertical pipes through elbows. The two vertical pipes are inserted into the inside of the concentrate barrel. A plurality of groups of water outlet holes are arranged on the vertical pipes from top to bottom. Each group of water outlet holes comprises four sub-water outlet holes located on the same cross-section of the vertical pipe. A liquid level gauge is installed inside the concentrate barrel. The liquid level gauge is electrically connected to a controller, and the controller is electrically connected to the electromagnetic valve.

[0008] Further, the distance between two adjacent groups of water outlet holes is 20 mm. Further still, the four sub-water outlet holes are evenly distributed on the same cross-section of the vertical pipe, and the diameter of the sub-water outlet holes is 3 mm. The function is to increase the water outlet coverage range and improve the defoaming effect.

[0009] Further, the bottoms of the two vertical pipes are blocked by plugging heads. The function is to prevent the defoaming water from flowing out at the bottom of the vertical pipes, increase the water outlet pressure of the horizontal defoaming water when there are more horizontal foams, and improve the defoaming effect.

[0010] Further, a water pump is arranged on the main pipeline. The function is to increase the inlet pressure of the defoaming water and break the foam with the water flow under a relatively large pressure.

[0011] Further, "horn"-shaped nozzles are connected to the bottoms of the two vertical pipes, and a plurality of evenly distributed spray holes are arranged at the bottoms of the nozzles. The function is to spray water downward when there are more foams at the lower part. The "horn"-shaped nozzles help to increase the water spraying area and improve the defoaming effect.

[0012] Further, a metal mesh is fixed on the inner wall of the concentrate barrel. The metal mesh is located above the branch pipes, and the main pipeline passes through the metal mesh. The function is that when the liquid level rises, the rising large bubbles can be pre-crushed by the cutting action of the metal mesh grid, and the defoaming effect is improved.

[0013] The beneficial effects of the utility model are as follows:

[0014] (1) For the automatic defoaming device for flotation concentrate provided by the utility model, the two vertical pipes are inserted into the inside of the concentrate barrel. A plurality of groups of water outlet holes are arranged on the vertical pipes from top to bottom. After water is passed through the main pipeline, it is sprayed horizontally from the vertical pipes, impacting and crushing the concentrate foam in the concentrate barrel, thus achieving the defoaming effect.

[0015] (2) For the automatic defoaming device for flotation concentrate provided by the utility model, a plurality of groups of water outlet holes are arranged on the vertical pipes from top to bottom. Each group of water outlet holes comprises four sub-water outlet holes located on the same cross-section of the vertical pipe. The function is to form a scattered water curtain by spraying water through the water outlet holes, which can cover the entire cross-section of the pulp in the concentrate barrel, achieving a three-dimensional defoaming effect, further improving the defoaming effect, and defoaming thoroughly.

[0016] (3)The automatic defoaming device for flotation concentrate provided by the present utility model has a liquid level gauge installed inside the concentrate barrel. The liquid level gauge is electrically connected to a controller, and the controller is electrically connected to a solenoid valve, realizing the linkage between the liquid level gauge and the solenoid valve. When the liquid level in the barrel rises to the preset upper limit value, the solenoid valve is controlled to open for water defoaming to prevent the material liquid from overflowing. At the same time, when the liquid level drops below the upper limit value, the solenoid valve closes, reducing the water consumption for defoaming. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of Embodiment 1 of the specific embodiment of the present utility model.

[0019] Figure 2 It is a cross-sectional view of the vertical pipe 1 in the figure.

[0020] Figure 3 It is a liquid control system diagram of Embodiment 1 of the specific embodiment of the present utility model.

[0021] Figure 4 It is a schematic structural diagram of Embodiment 2 of the specific embodiment of the present utility model.

[0022] Figure 5 It is a bottom view of the nozzle in Embodiment 2 of the specific embodiment of the present utility model.

[0023] Figure 6 It is a partial view of the metal mesh in Embodiment 2 of the specific embodiment of the present utility model.

[0024] In the figure, 1 - concentrate barrel, 2 - elbow, 3 - solenoid valve, 4 - main pipeline, 5 - branch pipe, 6 - vertical pipe, 61 - sub - water outlet hole, 7 - tee, 8 - nozzle, 81 - spray hole, 9 - water pump, 10 - metal mesh, 11 - liquid level gauge. SPECIFIC EMBODIMENTS

[0025] In order to enable those skilled in the art to better understand the technical solutions in the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] Embodiment 1

[0027] like Figure 1 The utility model provides an automatic defoaming device for flotation concentrate, comprising a concentrate barrel 1, a main pipeline 4, a solenoid valve 3 is arranged on the main pipeline 4, the end of the main pipeline 4 is connected to two branch pipes 5 through a tee pipe 7, the ends of the two branch pipes 5 are connected to two vertical pipes 6 through an elbow 2, the two vertical pipes 6 are two meters long and inserted into the concentrate barrel 1, the vertical pipe 6 is provided with a plurality of groups of water outlet holes from top to bottom, and the distance between two adjacent groups of water outlet holes is 20 mm, such as Figure 2 As shown, each group of water outlet holes includes four sub-water outlet holes 61 located on the same cross section of the vertical pipe 6. The sub-water outlet holes 61 are evenly distributed on the same cross section. The aperture of the sub-water outlet holes 61 is 3 mm. The bottom ends of the two vertical pipes 6 are blocked by plugging heads to increase the lateral water spray pressure.

[0028] like Figure 3 , shows a schematic diagram of a liquid level control system of a liquid level meter 11 and a solenoid valve 3. The utility model installs a liquid level meter 11 inside the concentrate barrel 1, and the liquid level meter 11 is electrically connected to the controller, and the controller is electrically connected to the solenoid valve 3. The controller is preset with an upper limit value of the liquid level. When the liquid level in the barrel rises, it indicates that the foam is formed too quickly. The liquid level meter 11 gives a liquid level signal to the solenoid valve 3. When the liquid level reaches the upper limit value, the controller controls the solenoid valve to open water to defoam. When the liquid level drops below the upper limit value, the controller controls the solenoid valve to close, avoiding the problem of continuous replenishment of defoaming water at low liquid level causing the subsequent filter press to reduce working efficiency.

[0029] The method of using the utility model is:

[0030] The main pipeline 4 is connected to the water supply device. At this time, the solenoid valve 3 is in a closed state. During the coal slime flotation, the flotation concentrate carries a large amount of microbubbles into the concentrate collecting tank and flows into the concentrate barrel 1. When one of the parameters such as the amount of raw coal entering the washing, the amount of circulating water, and the amount of sanitary water changes, the concentration of the flotation slurry will change instantaneously. When the flotation reagent is not adjusted in time, the flotation concentrate often carries a large amount of large bubbles into the concentrate collecting tank and flows into the concentrate barrel 1. At this time, the liquid level of the concentrate barrel 1 rises, and the liquid level meter 11 transmits the liquid level value signal in the barrel to the controller. When the controller determines that the liquid level value reaches the upper limit value, the controller controls the solenoid valve 3 to open, and the water flows into the two vertical pipes 6 and sprays out horizontally at the four sub-water outlets 61 to form a scattering water curtain, which can cover the entire cross-section of the slurry in the concentrate barrel 1, achieving a three-dimensional defoaming effect, and the defoaming is thorough. When the liquid level value in the barrel drops below the upper limit value after defoaming, the controller controls the solenoid valve 3 to close, and realizes automatic defoaming control.

[0031] Example 2

[0032] The difference between Example 2 and Example 1 is that Figure 4, a water pump 9 is provided on the main pipeline 4 to increase the water passing pressure. At the same time, "horn"-shaped nozzles 8 are connected to the bottoms of both vertical pipes 6. As Figure 5 , a number of spray holes 81 are evenly distributed at the bottom of the nozzle 8. The function is that when there is more foam at the lower part of the barrel, water is sprayed downward. The "horn"-shaped nozzle 8 helps to increase the water spraying area and improve the defoaming effect.

[0033] To further improve the defoaming effect, a metal mesh 10 is fixed on the inner wall of the concentrate barrel 1. As Figure 6 , a partial view of the metal mesh 10 grid is shown. The metal mesh 10 is located above the branch pipe 5, and the main pipeline 4 passes through the metal mesh 10. The function is that when the liquid level rises, the rising large air bubbles can be pre-crushed through the cutting action of the metal grid, improving the defoaming effect.

[0034] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, those of ordinary skill in the art can make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions should all be within the scope of the present invention. / Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, and they should all be covered within the protection scope of the present invention.

Claims

1. An automatic defoaming device for flotation concentrate, comprising a concentrate barrel, characterized in that: It also includes a main pipeline, which is provided with a solenoid valve. The end of the main pipeline is connected to two branch pipes through a tee pipe, and the ends of the two branch pipes are connected to two vertical pipes through elbows. The two vertical pipes are inserted into the concentrate barrel. The vertical pipes are provided with a plurality of groups of water outlet holes from top to bottom, and each group of water outlet holes includes four sub-water outlet holes located on the same cross section of the vertical pipe. A liquid level meter is installed inside the concentrate barrel, the liquid level meter is electrically connected to a controller, and the controller is electrically connected to the solenoid valve.

2. The automatic defoaming device for flotation concentrate according to claim 1, characterized in that: The distance between two adjacent groups of water holes is 20 mm, and the diameter of the water holes is 3 mm.

3. The automatic defoaming device for flotation concentrate according to claim 1, characterized in that: The bottom ends of the two vertical pipes are blocked by plugging heads.

4. The automatic defoaming device for flotation concentrate according to claim 1, characterized in that: A water pump is provided on the main pipeline.

5. The automatic defoaming device for flotation concentrate according to claim 1, characterized in that: The bottom ends of the two vertical pipes are connected to a "trumpet" shaped nozzle, and a number of evenly distributed spray holes are provided at the bottom of the nozzle.

6. The automatic defoaming device for flotation concentrate according to claim 1, characterized in that: A metal mesh is fixed on the inner wall of the concentrate barrel, the metal mesh is located above the branch pipe, and the main pipe passes through the metal mesh.

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