CN106669982A - Foam scraping device for flotation column and flotation column - Google Patents

Abstract

The invention relates to a bubble scraping device and a flotation column of a flotation column. The bubble scraping device includes a bubble scraping group with a plurality of scraping boards (5) and is used to guide the scraping group along the flotation column ( 3) the support platform (2) that the axis is installed on the top of the flotation column (3); wherein the foam scraping plate (5) has a logarithmic spiral plate structure on the side, and the plurality of foam scraping plates ( 5) Rotate along the axis of the flotation column (3) with the logarithmic spiral side as the scanning edge, so that the foam in the dead zone of the foam will move radially outwards, wherein the direction of rotation is based on the logarithmic spiral The end of the line with smaller curvature is the center, facing the curvature center of the logarithmic spiral; the flotation column has the above-mentioned scraping device. The foam scraping device can generate a radially outward force on the foam in the foam dead zone, so that the foam in the foam dead zone can be removed in time, and the flotation efficiency can be improved.

Description

Bubble scraping device and flotation column for a flotation column

technical field

The invention relates to the technical field of flotation mineral equipment, in particular to a bubble scraping device for a flotation column and the flotation column.

Background technique

Compared with flotation machines, flotation columns have more advantages in fine particle and fine particle beneficiation, so they are more widely used. In the field of coal preparation, the application of flotation columns is becoming more and more important as the amount of fine particle materials increases and customers' requirements for product quality increase. The flotation column has the advantages of less investment, less floor space, low energy consumption and beneficial separation effect of fine particle materials.

With the large-scale development of mineral processing equipment, in order to increase the processing capacity, the flotation column gradually develops to a large cross-sectional area. However, the large cross-sectional area also brings some problems to the flotation of the flotation column. A froth dead zone is formed mainly in the top center portion of the flotation column. The foam dead zone mainly comes from two aspects. One aspect is that in terms of aeration performance, the enlargement of the flotation column will easily lead to uneven inflation, so that it will be difficult for the foam to overflow at the center of the top of the flotation column, thus forming a foam dead zone. On the other hand, due to the high floating rate of minerals in the flotation column and the good separation effect, the foam layer is too thick and the amount of overflow foam becomes larger. Due to the poor self-flowing ability of the foam in the middle, it generally cannot flow out, thus forming a foam dead zone.

Because the foam in the middle of the flotation column cannot flow out in time, the foam dead zone of the flotation column makes the target minerals float repeatedly in the flotation column, resulting in flotation energy consumption and cost. important question.

Contents of the invention

In view of the above analysis, the present invention aims to provide a scraping device and a flotation column of a flotation column, the scraping device can generate a radially outward force on the foam in the foam dead zone, so that the foam in the foam dead zone The foam is removed in time to improve the flotation efficiency.

The purpose of the present invention is mainly achieved through the following technical solutions: on the one hand, the present invention provides a scraping device for a flotation column, including a scraping group with a plurality of scraping plates and a The axis of the flotation column is installed on the support platform at the top of the flotation column; wherein the plurality of scraping boards are plate-like structures with logarithmic spiral sides, and the scraping boards have logarithmic spiral sides. The side is scanning and rotating along the axis of the flotation column, so that the foam in the dead zone of the foam moves radially outwards, wherein the direction of rotation is centered on the end of the logarithmic spiral with a smaller curvature and towards the direction of the logarithmic spiral. center of curvature.

Further, the foam scraping device further includes a transmission rod coaxial with the flotation column, and the foam scraping plate is fixed on the transmission rod.

Further, the plurality of foam scraping plates are evenly distributed on the transmission rod along the circumferential direction, and it is ensured that the side scanning surfaces of the plurality of foam scraping plates are on the same horizontal plane.

The foam scraping device also includes a motor that drives the plurality of foam scraping plates to rotate, and the motor is connected to the plurality of foam scraping plates through a transmission rod.

Further, the foam scraping group has four foam scraping plates.

Further, the support platform includes a vertical part and a horizontal part, the vertical part is fixed on the side wall of the flotation column, and the horizontal part is horizontally supported and fixed by the vertical part.

Further, the motor is fixed on the upper side of the horizontal part, and one end of the transmission rod is fixed on the lower side of the horizontal part.

Further, the logarithmic spiral formula is: Among them: α and k are constants, is the polar angle, ρ is the polar diameter, and e is the base of the natural logarithm.

Another aspect of the present invention also provides a flotation column, which has the above-mentioned bubble scraping device.

The beneficial effects of the present invention are as follows:

The side of the foam scraping board of the present invention adopts a logarithmic spiral shape. When the foam scraping board rotates, the side with the logarithmic spiral is the scanning surface for scanning. When the foam is in contact with the foam, the foam is cut by the contact point. The force in the direction of the normal line, due to the particularity of the logarithmic spiral, the normal line points to the radially outward direction of the flotation column, thereby driving the foam to the radially outward direction, thereby scraping the foam out to avoid Foam dead zone; in addition, the logarithmic spiral shape can cleverly realize the shortest radial movement of foam to the overflow weir, which solves the problem of repeated flotation of target minerals in the flotation column and improves flotation efficiency.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The drawings are for the purpose of illustrating specific embodiments only and are not to be considered as limitations of the invention, and like reference numerals refer to like parts throughout the drawings.

Fig. 1 is the front view of the bubble scraping device of the flotation column of embodiment;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is the top view of Fig. 1;

Among them: 1-motor, 2-support platform, 3-flotation column, 4-overflow weir, 5-scraping foam plate, 6-transmission rod.

detailed description

Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and are used together with the embodiments of the present invention to explain the principle of the present invention.

The embodiment of the present invention provides a scraping device for a flotation column and a flotation column using the scraping device. As shown in FIG. The target minerals with lower density float up under the action of the gas, and finally overflow from the top of the flotation column 3 and flow into the overflow weir 4, and then achieve the purpose of separating the target minerals. If the mineral floating rate is too high, the foam layer will be too thick, and some foam in the center of the flotation column will not overflow in time, forming a foam dead zone. The flotation will increase the cost and energy consumption of flotation. Therefore at the top of the flotation column, a foam scraping device is set to drive out the foam in the foam dead zone, as shown in Fig. 1, Fig. 2 and Fig. , scraping foam group, motor 1 and transmission rod 6.

The foam scraping group includes a foam scraper 5, the foam scraper 5 has a plate-like structure, and the side of the foam scraper 5 is in a logarithmic spiral shape, and the formula of the logarithmic spiral is: Among them: α and k are constants, is the polar angle, ρ is the polar diameter, e is the base of natural logarithm, k can be 0.84-0.85, the size of α determines the strength and stiffness of the blade, and its value depends on the flotation column installed in the scraping device. Diameter, generally take 20%-25% of the diameter of the flotation column, the above value is the optimal range obtained by taking coal slime as an example under laboratory conditions, but the specific values of k and α will vary depending on the type of mineral and the foam load Quantities fluctuate. The scraper 5 rotates along the axis of the flotation column with the side of the logarithmic spiral as the scanning surface, and the side with the logarithmic spiral forms a scanning surface covering the cross-section of the flotation column as it rotates. When the foam contacts, a force is formed to drive the foam away. The direction of rotation is centered on the smaller end of the logarithmic spiral and rotates toward the center of curvature of the logarithmic spiral. The installation direction of the foam scraper 5 is shown in Figure 3 As shown, the corresponding direction of rotation is counterclockwise. Due to the special shape of the logarithmic spiral, when the foam in the foam dead zone in the center of the flotation column contacts with the scraper 5, it will be subjected to the force of the scraper 5 in the normal direction of the tangent surface of the contact point, and the normal direction points to the flotation The radial direction of the column is outward, so that the foam moves outward along the shortest radial distance, thereby forcing the foam out, avoiding the foam dead zone, and improving the flotation efficiency.

The foam scraping group may have multiple scraping boards 5, and when the foam scraping group has multiple scraping boards 5, the preferred installation method is that the multiple scraping boards 5 are evenly distributed along the axis of the flotation column. As shown in Figure 3, the foam scraping group of the embodiment of the present invention has four foam scraping plates 5, which are evenly distributed along the axis of the flotation column, and ensure that the scanning edges with logarithmic spiral sides are on the same level , to ensure that the scanning surfaces formed by the plurality of foam scraping plates 5 are at the same horizontal plane when they are rotating.

The foam scraping plate 5 is driven to rotate by the motor 1, and the motor 1 drives the rotation of the foam scraping plate 5 through the transmission rod 6. The motor 1 is fixed on one end of the transmission rod 6, and the other end of the transmission rod is evenly fixed around the transmission rod 6. A foam scraper 5, so that the motor 1 drives the transmission rod 6 to rotate, and the transmission rod 6 drives the foam scraper 5 fixed on the transmission rod 6 to rotate. The motor 1 and the transmission rod 6 can also be replaced by other transmission mechanisms well known in the art, as long as the purpose of driving the foam scraper to rotate can be achieved.

The bubble scraping group is fixed on the top of the flotation column through the support platform 2. The support platform 2 includes a vertical part and a horizontal part. As shown in Figure 1, Figure 2 and Figure 3, the vertical part is an upright plate structure fixed on On the side wall of the flotation column, there are two vertical parts, which are symmetrically fixed on the side wall of the flotation column, and the horizontal part is a strip plate, which is supported by the two vertical parts and hangs horizontally on the The air above the flotation column, and then fix the bubble scraping group on the horizontal part, so that the bubble scraping group forms a suspended state relative to the flotation column. The way that the concrete scraper group is fixed on the horizontal part is that the motor 1 is fixed on the upper side of the horizontal part, and one end of the transmission rod 6 is fixed on the lower side of the level. Of course, there can also be more than 2 vertical parts. When there are more than 2 vertical parts, a plurality of vertical parts are evenly distributed on the side wall of the flotation column, and the corresponding horizontal part can be used by all vertical parts. Supported plank structure. The structure of the supporting table 2 can be replaced by other well-known supporting structures in the art, as long as the purpose of supporting the scraping bubble group and suspending the scraping bubble group above the flotation column can be achieved.

To sum up, the embodiment of the present invention provides a bubble scraping device for a flotation column and a flotation column, wherein the side of the bubble scraper is designed in a logarithmic spiral shape, and the bubbles are rotated to make the foam radially outward And move outward with the shortest distance to force mechanically drive the foam in the foam dead zone, thereby reducing the formation of the foam dead zone, avoiding the repeated flotation of the target mineral in the flotation column, thereby improving the flotation efficiency.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention.

Claims (9)

1. a kind of float skimming device of flotation column, it is characterised in that include with it is multiple scrape bubble plate (5) scrape bubble group and for by institute State and scrape the supporting table (2) that bubble group is arranged at the top of flotation column (3) along flotation column (3) axis；Wherein it is the plurality of scrape bubble plate (5) be Side has the platy structure of logarithmic spiral-shaped, and bubble plate (5) of scraping is floated with the side with logarithmic spiral-shaped to scan edge Select post (3) axis to rotate, catch up with the foam in foam dead band to move in a radially outer direction to arrange, wherein direction of rotation is with described right Centered on the less one end of number helical curvature, towards the center of curvature of logatithmic spiral.

2. the float skimming device of flotation column according to claim 1, it is characterised in that the float skimming device also includes and flotation column (3) coaxial drive link (6), bubble plate (5) of scraping is fixed on the drive link (6).

3. the float skimming device of flotation column according to claim 2, it is characterised in that the plurality of to scrape bubble plate (5) circumferentially side To being evenly distributed on the drive link (6), and ensure the plurality of side scanning plane for scraping bubble plate (5) in same level On.

4. the float skimming device of flotation column according to claim 3, it is characterised in that the float skimming device also includes driving described Multiple motors (1) for scraping bubble plate (5) rotation, the motor (1) connects the plurality of scraping and steeps plate (5) by drive link (6).

5. according to the float skimming device of the arbitrary flotation column of claim 1-4, it is characterised in that the bubble group of scraping is with four institutes State and scrape bubble plate (5).

6. according to any one of claim 5 flotation column float skimming device, it is characterised in that the supporting table (2) is including perpendicular Straight portion and horizontal part, the vertical portion is fixed on the wall of flotation column (3) side, and the horizontal part is flatly supported by the vertical portion It is fixed.

7. the float skimming device of flotation column according to claim 6, it is characterised in that the motor (1) is fixed on the level Portion upside, described drive link (6) one end is fixed on the horizontal part downside.

8. the float skimming device of flotation column according to claim 1, it is characterised in that the logatithmic spiral formula is：Wherein：α and k is constant,It is polar angle, ρ is polar diameter, and e is the bottom of natural logrithm.

9. a kind of flotation column, it is characterised in that the float skimming device with the flotation column as described in claim 1-8 is arbitrary.