Vibration grid device capable of improving flotation column concentrate quality

Abstract

The invention relates to the technical field of micro-fine particle mineral flotation, in particular to a vibration grid device capable of improving the quality of flotation column concentrate. The device is applied to a foam separation section of a flotation column, two groups of grids are symmetrically arranged on two sides of an inner cavity of the flotation column, the grids are positioned on the upper section of an ore pulp liquid level of the flotation column, grid surfaces of the grids are vertically arranged, and the two grids are driven by a reciprocating driving structure and do synchronous reciprocating approaching and separating actions in the radial direction of the flotation column. The structure of the separation section of the flotation column is optimized, weak-hydrophobicity non-target fine mineral particles on the surfaces of bubbles are promoted to be desorbed from the surfaces of the bubbles, and the fine particle flotation concentrate grade of the flotation column is improved.

Description

Technical Field

[0001] The invention relates to the technical field of micro-particle mineral flotation, in particular to a vibrating grid device capable of improving the quality of flotation column concentrate. Background Art

[0002] The rapid advancement of industrialization has accelerated the consumption of high-quality resources. Available primary mineral resources and secondary resources such as tailings and waste residues are becoming increasingly depleted, complex, and refined. The separation of fine-grained, especially micro-grained, embedded mineral resources is becoming increasingly important. Flotation is the most effective and widely used method for recovering fine minerals. It separates valuable minerals from gangue minerals based on differences in surface hydrophobicity.

[0003] Most existing mineral flotation devices, as described in a document titled "A Mineral Flotation Device" with Chinese Patent Publication No. CN205361673U, utilize a bubble generator to generate bubbles within a flotation column. The bubbles carry fine minerals and overflow from the top opening of the flotation column into a foam collection tank for collection, thereby achieving flotation of fine minerals.

[0004] However, in actual implementation, due to problems such as fine particle coagulation, reagent effect, and entrainment in the flotation process of fine minerals, the phenomenon of non-target minerals floating to the concentrate recovery foam layer during the flotation process is common, which in turn leads to unsatisfactory concentrate grade of fine mineral flotation, and therefore needs to be solved urgently. Summary of the Invention

[0005] In order to avoid and overcome the technical problems existing in the prior art, the present invention provides a vibrating grid device that can improve the quality of flotation column concentrate, optimize the internal structure of the flotation column, promote the desorption of weakly hydrophobic non-target fine mineral particles on the bubble surface from the bubble surface, and improve the grade of fine particle flotation concentrate in the flotation column.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A vibrating grid device for improving the quality of flotation column concentrates is used in flotation columns. Two sets of grids are symmetrically arranged on either side of the column's inner cavity. The grids are located above the column's slurry level, with their surfaces arranged vertically. Both grids are driven by a reciprocating drive structure and perform synchronous reciprocating movements toward and away from each other along the column's radial direction. The device characterizes the improvement in concentrate grade achieved by the flotation column by predicting the desorption probability P of fine, non-target minerals.

[0008]

[0009] Where, P is the probability of desorption of non-target minerals, dimensionless;

[0010] M is the center distance of the grille holes, in mm;

[0011] f is the reciprocating frequency of the grid, in Hz;

[0012] a is the one-way stroke of the reciprocating motion of the grille, in mm;

[0013] d p is the particle size of the minerals in the slurry to be floated, in μm;

[0014] θ is the contact angle of weakly hydrophobic non-target minerals, in degrees;

[0015] g is the acceleration due to gravity, in m / s 2 .

[0016] As a further solution of the present invention: the reciprocating drive structure includes two slide rails distributed on both sides of the flotation column, the length direction of the slide rails is distributed along the radial direction of the flotation column, and a linear slider driven by the power unit slides on the slide rails. The linear slider is connected to the grid by a slide rod that slides through the flotation column, and the flotation column is sealed with the flotation column at the penetration point of the slide rod.

[0017] As a further solution of the present invention: the power unit includes two servo motors respectively arranged on both sides of the flotation column, the two servo motors are synchronously driven by a synchronous controller, and a crank connecting rod is installed between the servo motor and the linear slider on the same side to drive the linear slider to perform reciprocating sliding motion.

[0018] As a further solution of the present invention: the power unit includes a driving screw rod that forms a screw rod slider structure with the two linear sliders. The driving screw rod is driven to rotate by a motor, and the thread directions of the screw rod and the two linear sliders are opposite at the threaded connection.

[0019] As a further solution of the present invention: As a further solution of the present invention: the grid is an arc-shaped structure arranged to fit the inner wall of the flotation column, the inner diameter and length of the flotation column are 60 mm and 630 mm respectively, the slurry level height in the grid is 580 mm, the length and width of the grid projected along its sliding direction are both 41 mm, the width and thickness of the grid bars are both 3 mm, the grid holes are square structures with a center distance of 13 mm; the reciprocating motion one-way stroke of the grid is 10 mm.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The grid tail flow and the grid hole jet effect generate a uniform turbulent separation flow field. By controlling the frequency of the grid's reciprocating approach and separation action, the flow field intensity is regulated. During the flotation process of fine-grained minerals, the weakly hydrophobic fine non-target mineral particles adhering to the bubbles are desorbed from the bubbles due to the action of the turbulent field. This improves the concentrate grade recovered by fine-grained flotation while maintaining a high recovery rate.

[0022] 2. The reciprocating motion of the grid not only causes the desorption of non-target minerals, but may also cause the desorption of target minerals, and the greater the grid movement frequency, the greater the probability of particle desorption, which will obviously lead to a longer final fine particle flotation time. This application sets a calculation model for the desorption probability of fine non-target mineral particles in flotation by a flotation column. When the particle size of the minerals in the slurry to be floated and the contact angle of the weakly hydrophobic non-target minerals change, the appropriate reciprocating motion frequency of the grid can be quickly obtained, so that the calculated desorption probability of non-target minerals meets the required requirements without excessively extending the fine particle flotation time, thereby shortening the flotation time and optimizing the concentrate recovery rate and grade.

[0023] 3. There are two implementation options for the power unit that drives the reciprocating motion of the grille. The first employs a crank slider structure, which offers the advantages of efficient and stable transmission. The second employs a screw slider mechanism, which not only offers high synchronization but also reduces costs and facilitates adjustment of the linear slider's sliding stroke, providing hardware technical support for subsequent operations with different sliding strokes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the top view of the flotation column in the present invention.

[0025] Figure 2 It is a structural schematic diagram of the connection between the flotation column and the grid in the present invention.

[0026] Figure 3 It is a structural schematic diagram of the present invention.

[0027] Figure 4 It is a structural schematic diagram of a comparison diagram of fitting data and experimental data in the present invention.

[0028] In the figure: 10, flotation column; 20, reciprocating drive structure; 21, slide rail; 22, linear slider; 23, slide rod; 24, crank-connecting rod; 25, servo motor; 26, synchronous controller; 30, grid; 40, peristaltic pump; 50, electromagnetic flowmeter; 60, air compressor; 70, porous ceramic bubble generator; 80, collecting tank; 81, concentrate outlet; 90, slurry circulation pipeline. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] For ease of understanding, the specific structure and working mode of the present invention are further described below with reference to the accompanying drawings:

[0031] The specific structure of the present invention refers to Figure 1-4 As shown, its main structure includes a flotation column 10 and two groups of grids 30 symmetrically arranged on both sides of the inner cavity of the flotation column 10. The grids 30 are located in the upper section of the slurry level in the flotation column 10, and the grid surface of the grids 30 is arranged vertically, which has little effect on the flow area during the flotation of the foam. In addition, the two grids 30 are driven by the reciprocating drive structure 20 and perform synchronous reciprocating movement in the radial direction of the flotation column 10. The tail flow of the grids 30 and the hole jet effect of the grids 30 are used to generate an isotropic turbulent separation flow field. In the flotation column 10, in the upper section of the slurry level in the flotation column 10, the mineralized bubbles are stable and dense in this area, which makes the grids 30 cause greater disturbance to the foam-dense area. During use, the frequency of the reciprocating approach and separation of the grid 30 is controlled to regulate the flow field intensity, so that during the flotation process of fine particles, due to the action of the turbulent flow field, the weakly hydrophobic non-target minerals adhering to the bubbles are desorbed from the bubbles, thereby improving the grade of the concentrate while maintaining a high recovery rate as much as possible.

[0032] In order to verify the effect of the above-mentioned grid 30 structure on improving the grade of fine particle flotation concentrate, the applicant conducted multiple tests.

[0033] First, a fine particle flotation test system using the above-mentioned grid device was built. Figure 3 As shown, the inner cavity of the lower tube body of the flotation column 10 constitutes a slurry storage chamber. The flotation column 10 also includes a slurry circulation pipeline 90. Both ends of the slurry circulation pipeline 90 of the flotation column 10 are connected to the slurry circulation pipeline 90, and a peristaltic pump 40 is installed on the slurry circulation pipeline 90. By starting the peristaltic pump 40, the slurry in the flotation column 10 can be kept in a continuous circulating flow state, enhancing the fluidity of the slurry, making the movement of fine mineral particles and bubbles more active, increasing the collision frequency, and thus improving the recovery rate.

[0034] Further, such as Figure 3As shown, the bubble generation structure includes an air compressor 60 and a porous ceramic bubble generator 70 connected to the output of the air compressor 60. This produces dense small bubbles, which rise slowly, extending their contact time with particles, facilitating the adsorption of hydrophobic minerals and improving recovery rates. Furthermore, the output of the porous ceramic bubble generator 70 is connected to the output of the slurry circulation pipeline 90, further enhancing the movement of mineral particles and bubbles, thereby improving recovery rates.

[0035] like Figure 3 As shown, an electromagnetic flowmeter 50 is installed on the slurry circulation pipeline 90. The electromagnetic flowmeter 50 can measure the flow rate of the slurry in the slurry circulation pipeline 90. By observing the value of the electromagnetic flowmeter 50, the gas flow of the air compressor 60 can be adjusted accordingly.

[0036] On the basis of the above, if Figure 3 As shown, a collecting trough 80 with an upward notch is provided on the outer periphery of the top of the flotation column 10, so that the bubbles overflowing from the top of the flotation column 10 will be collected by the collecting trough 80, and the bottom of the collecting trough 80 is arranged inclined, and a concentrate outlet 81 is provided at the lower inclined part of the bottom of the trough, so as to realize the directional discharge of the concentrate from the concentrate outlet 81.

[0037] On the basis of the above, the grid 30 is an arc-shaped structure arranged to fit the inner wall of the flotation column 10. The inner diameter and length of the flotation column 10 are 60 mm and 630 mm respectively. The slurry level in the grid 30 is 580 mm. The length and width of the grid 30 projected along its sliding direction are both 41 mm. The width and thickness of the bars of the grid 30 are both 3 mm. The grid holes of the grid 30 are square structures with a center distance of 13 mm. The reciprocating one-way stroke of the grid 30 is 10 mm.

[0038] Based on the fine particle flotation test system constructed above, experimental verification was carried out.

[0039] Specifically, in Experiment 1, five pulp samples with the same working conditions were obtained, each with a particle size of 45 μm, a contact angle of 83°, and an original ash content of 29.05% in the mineral to be floated. These samples were placed in the flotation column 10 of the present application in sequence, and flotation operations were performed under working conditions where the grid 30 had a reciprocating frequency of 0 Hz, 2 Hz, 3 Hz, 4 Hz, and 5 Hz, respectively. The reciprocating frequency of 0 Hz indicates that the grid 30 structure is not in operation. The turbulent dissipation rate of the flotation column 10 pulp in the experiment, the grayness of the final flotation concentrate, and the desorption probability of fine non-target mineral particles in the final flotation concentrate were obtained for the four samples under working conditions where the grid 30 had a reciprocating frequency of 2 Hz, 3 Hz, 4 Hz, and 5 Hz. The ash content of the flotation concentrate when the grid 30 had a reciprocating frequency of 0 Hz was also obtained. The experimental results of Experiment 1 are shown in Table 1 below:

[0040] Table 1

[0041]

[0042] From Table 1 above, we can see that:

[0043] As the reciprocating frequency of the grid 30 gradually increases, the turbulent dissipation rate formed is proportional to the frequency, that is, the intensity of the turbulent field can be controlled by the reciprocating frequency of the grid 30, and the relationship is proportional.

[0044] The ash content of the recovered pulp in the experiment was lower than the original ash content of the pulp. However, it is clear that when the grid 30 reciprocates (when the frequency is not 0 Hz), the ash content of the final flotation concentrate is less than the ash content of the flotation concentrate when the grid 30 is not operating. Obviously, when the grid is operating at 30, the flotation concentrate grade is higher (in flotation, the ash content reflects the separation effect of the target mineral and gangue minerals; the higher the ash content, the more impurities in the concentrate, and the lower the grade may be). In addition, the higher the frequency, the lower the ash content of the flotation concentrate, and the higher the grade of the flotation concentrate.

[0045] In addition, based on the fact that the movement of the above-mentioned grid 30 will reduce the ash content of the concentrate recovered by flotation (i.e., improve the grade), the ash content of the concentrate obtained from the flotation experiment when the grid 30 is not working is the original value. The ratio of the reduction in the ash content of the concentrate relative to the original value under the movement of the grid 30 to the original value is the desorption probability of the non-target minerals in the flotation. Obviously, the higher the desorption probability of the non-target minerals in the flotation, the higher the grade of the flotation concentrate. This application uses the desorption probability of fine non-target mineral particles as a quantitative value to show that the flotation concentrate grade is improved when the grid 30 structure is running, so as to more intuitively show the improvement of the flotation concentrate grade. As can be seen from Table 1 above, the desorption probability of the non-target minerals in the final flotation when the grid 30 is moving is increased relative to that when the grid 30 is not running, which means that the less non-target mineral content in the final flotation concentrate, the higher the grade of the flotation concentrate. In addition, the higher the frequency, the smaller the non-target mineral content recovered by flotation, and the higher the grade of the flotation concentrate.

[0046] In Experiment 2, five pulp samples with the same operating conditions were obtained, each with a particle size of 60 μm, a contact angle of 60°, and an initial ash content of 45.03%. Flotation operations were performed under the operating conditions of the grid 30 reciprocating frequency of 0 Hz, 2 Hz, 3 Hz, 4 Hz, and 5 Hz, respectively. The reciprocating frequency of 0 Hz indicates that the grid 30 structure is not in operation. The turbulent dissipation rate of the flotation column 10 pulp during the experiment, the ash content of the final flotation concentrate, and the desorption probability of non-target minerals in the final flotation concentrate were obtained for the four samples under the operating conditions of the grid 30 reciprocating frequency of 2 Hz, 3 Hz, 4 Hz, and 5 Hz. The ash content of the flotation concentrate when the grid 30 reciprocated at 0 Hz was also obtained. The experimental results of Experiment 2 are shown in Table 2 below:

[0047] Table 2

[0048]

[0049]

[0050] From Table 2 above, we can see that:

[0051] As the reciprocating frequency of the grid 30 gradually increases, the turbulent dissipation rate formed is proportional to the frequency, that is, the intensity of the turbulent field can be controlled by the reciprocating frequency of the grid 30, and the relationship is proportional.

[0052] The ash content of the recovered slurry in the experiment was lower than the original ash content of the slurry. However, it is clear that when the grid 30 reciprocates, the ash content of the final floated concentrate is lower than that of the concentrate floated when the grid 30 is not operating. Clearly, the grade of the floated concentrate is higher when the grid 30 is operating. In addition, although the ash content of the floated concentrate increases at frequencies of 3Hz and 4Hz, combined with Experiment 1, this may be due to experimental error. However, the general conclusion is that the higher the frequency, the lower the ash content of the floated concentrate, and the higher the grade of the floated concentrate.

[0053] Furthermore, the probability of desorption of non-target minerals in the final flotation increases when the grid 30 is operating compared to when the grid 30 is not operating. This indicates that the content of non-target minerals in the final flotation concentrate is lower. Clearly, when the grid is operating at 30, the flotation concentrate grade is higher. Furthermore, although the probability of desorption of non-target minerals in the flotation increases at frequencies of 3 Hz and 4 Hz, this may be due to experimental error, as shown in Experiment 1. However, the general conclusion is that the higher the frequency, the lower the content of non-target minerals in the flotation, and the higher the flotation concentrate grade.

[0054] Specifically, in order to achieve rapid prediction of the desorption probability of non-target minerals in the flotation column 10 under different working conditions, the present application also provides a calculation formula for predicting the desorption probability P of non-target minerals in the flotation column 10:

[0055]

[0056] Where, P is the probability of desorption of non-target minerals, dimensionless;

[0057] M is the center distance of the grid holes of the grid 30, in mm;

[0058] f is the reciprocating frequency of the grid 30, in Hz;

[0059] a is the one-way stroke of the reciprocating motion of the grid 30, in mm;

[0060] d p is the particle size of the minerals in the slurry to be floated, in μm;

[0061] θ is the contact angle of weakly hydrophobic non-target minerals, in degrees;

[0062] g is the acceleration due to gravity, in m / s 2 .

[0063] First, since the desorption of fine mineral particles in the turbulent field is caused by factors such as inertia, particle movement on the bubble surface, bubble surface oscillation deformation, and bubble coalescence, and these factors are related to the particle characteristics, bubble characteristics, and liquid phase environment, the isotropic flow field generated by the grid 30 structure is applied to the fine mineral flotation recovery system. The controllable parameters are: the center distance M of the grid holes of the grid 30, the reciprocating motion frequency f of the grid 30, the one-way stroke a of the reciprocating motion of the grid 30, and the particle size d of the minerals in the slurry to be floated. p and the mineral contact angle θ. Three dimensionless numbers are constructed using the dimensional analysis method, where the turbulent flow field characteristics are characterized by grid-related parameters as dimensionless vibration acceleration. The particle size and contact angle parameters can be expressed as the dimensionless cosine of the half-angle of the contact angle. dimensionless numbers related to size

[0064] The test above employed an arc-shaped grid 30 that conforms to the inner wall of the flotation column 10. The inner diameter and length of the flotation column 10 are 60 mm and 630 mm, respectively. The slurry level within the grid 30 is 580 mm. The length and width of the grid 30 projected along its sliding direction are both 41 mm. The bars of the grid 30 are both 3 mm wide and thick, and the grid holes of the grid 30 are square with a center-to-center spacing of 13 mm. The reciprocating stroke of the grid 30 is 10 mm. The desorption probability of particles in the flow field is then correlated with the above parameters to establish the following prediction relationship for the desorption probability P of non-target minerals:

[0065]

[0066] Combined with the flotation data results, the fitting coefficients were calculated using Matlab R2014 software. The logarithm of the above prediction relationship was taken, and the coefficients of the above prediction relationship were fitted and calculated using the nlinfit function combined with the robust fitting method. The comparison between the fitting data and the experimental data is shown in the figure below. Figure 4 The calculation formula for the desorption probability of non-target minerals flotated by the flotation column 10 of the present application is obtained as follows:

[0067]

[0068] In order to further verify the accuracy of the above-mentioned formula for calculating the desorption probability of non-target minerals flotated by the flotation column 10, the applicant conducted the following experiment 3.

[0069] In Experiment 3, five pulp samples with the same working conditions were obtained, in which the particle size of the minerals in the pulp to be floated was 30 μm, the contact angle was 22°, and the original ash content of the pulp was 65.09%. The samples were placed in the flotation column 10 of the present application in sequence, and flotation operations were performed under the working conditions of the reciprocating frequency of the grid 30 being 0 Hz, 2 Hz, 3 Hz, 4 Hz, and 5 Hz, respectively, where the reciprocating frequency of 0 Hz indicates that the grid 30 structure is not operating. The desorption probability of non-target minerals in the final floated concentrate of the five samples at different operating frequencies of the grid 30 was obtained. At the same time, the predicted probability value under the above working conditions was calculated using the calculation formula for the desorption probability of non-target minerals. The experimental results of Experiment 3 and the calculated prediction structure are shown in Table 3 below:

[0070] Table 3

[0071] Frequency (Hz) Prediction probability value Experimental probability value 2 0.0157 0.0138 3 0.0234 0.0236 4 0.0311 0.0335 5 0.0387 0.0453 0 / /

[0072] It can be seen from Table 3 above that the relative errors between the predicted probability value calculated by the non-target mineral desorption probability calculation formula of the present application and the experimental probability value obtained in the experiment are 13.77%, 0.85%, 7.16%, and 14.58% when the reciprocating motion frequency of the grid 30 is 2Hz, 3Hz, 4Hz, and 5Hz, respectively, and the average relative error is 9.09%. It is obvious that the predicted non-target mineral desorption probability value calculated by the non-target mineral desorption probability calculation formula of the present application is more accurate.

[0073] The reciprocating motion of the grid 30 not only causes the desorption of fine non-target mineral particles, but may also cause the desorption of target minerals. Furthermore, the greater the frequency of grid 30 motion, the greater the probability of desorption. This obviously prolongs the final flotation time. Therefore, in actual implementation, the appropriate reciprocating motion frequency of the grid 30 can be adjusted by varying the particle size and contact angle of the minerals in the slurry to be floated. This allows the calculated desorption probability of non-target minerals to meet the desired requirements without excessively extending the flotation time of the fine particles. This shortens the flotation time and optimizes the concentrate recovery rate and grade.

[0074] Specifically, such as Figure 2As shown, the reciprocating drive structure 20 includes two slide rails 21 distributed on both sides of the flotation column 10. The length direction of the slide rails 21 is distributed along the radial direction of the flotation column 10, and a linear slider 22 driven by a power unit slides on the slide rails 21. The linear slider 22 is connected to the grille 30 by sliding a slide rod 23 that slides through the flotation column 10. The flotation column 10 is sealed with the flotation column 10 at the point where the slide rod 23 penetrates the flotation column 10. Specifically, the sealing can be achieved by performing a packing seal at the point where the slide rod 23 penetrates the flotation column 10 to prevent the flotation column 10 from leaking at the slide rod 23. The form of the slide rod 23 penetrating the side wall of the flotation column 10 does not require the top space of the flotation column 10. Based on the above-mentioned power unit driving the linear slider 22 to slide on the slide rail 21 to drive the grille 30 to reciprocate, it can be ensured that the grille 30 maintains a stable sliding action along the radial direction of the flotation column 10.

[0075] Based on the above, the power unit can have multiple implementation methods:

[0076] Example 1, as Figure 2 As shown, the power unit includes two servo motors 25, one on each side of the flotation column 10. The two servo motors 25 are synchronously driven by a synchronous controller 26. A crank connecting rod 24 is installed between the servo motors 25 on the same side and the linear slider 22, driving the linear slider 22 to slide back and forth. The synchronous controller 26 ensures the synchronization of the two servo motors 25, and the crank connecting rod 24 is used to achieve linkage with the linear slider 22. By adjusting the speed of the servo motors 25, the linear slider 22 can perform continuous reciprocating sliding motion under a fixed reciprocating stroke, thereby achieving the advantages of efficient and stable transmission.

[0077] In Example 2, not shown in the accompanying drawings, the power unit includes a drive screw that forms a screw-slider structure with the two linear sliders 22. The drive screw is driven to rotate by a motor, and the threaded connection between the screw and the two linear sliders 22 has opposite thread directions. As a result, when the screw rotates, the sliding directions of the two linear sliders 22 are opposite to each other, thereby achieving synchronous approaching and separating movements of the two linear sliders 22. In this embodiment, using a single motor as the driving power source for the two linear sliders 22 not only achieves high synchronization and low cost, but also facilitates adjustment of the sliding stroke of the linear sliders 22, providing hardware technical support for subsequent operations with different sliding strokes.

[0078] Of course, it will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, but also encompasses the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and it is intended that all variations that fall within the meaning and range of equivalents of the claims be encompassed within the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0079] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0080] The technology, shape, and structure not described in detail in the present invention are all well-known technologies.

Claims

1. A vibrating grid device for improving the quality of flotation column concentrate, used in a flotation column (10), characterized in that: Two groups of grids (30) are symmetrically arranged on both sides of the inner cavity of the flotation column (10). The grids (30) are located at the upper part of the slurry level of the flotation column (10), and the grid surfaces of the grids (30) are arranged vertically. The two grids (30) are driven by a reciprocating drive structure (20) and perform synchronous reciprocating movement of approaching and separating along the radial direction of the flotation column (10). The device characterizes the improvement effect of the concentrate grade of the flotation column (10) by predicting the desorption probability P of fine non-target minerals. Where, P is the probability of desorption of non-target minerals, dimensionless; M is the center distance of the grid holes of the grid (30), in mm; f is the reciprocating frequency of the grid (30), in Hz; a is the one-way stroke of the reciprocating motion of the grid (30), in mm; d p is the particle size of the minerals in the slurry to be floated, in μm; θ is the contact angle of weakly hydrophobic non-target minerals, in degrees; g is the acceleration due to gravity, in m / s 2 .

2. A vibrating grid device for improving the quality of flotation column concentrate according to claim 1, characterized in that: The reciprocating drive structure (20) comprises two slide rails (21) distributed on both sides of the flotation column (10), the length direction of the slide rails (21) being distributed along the radial direction of the flotation column (10), and a linear slider (22) driven by a power unit sliding on the slide rails (21), the linear slider (22) being connected to the grid (30) by a slide rod (23) sliding through the flotation column (10), and the flotation column (10) is sealed with the flotation column (10) at the penetration point of the slide rod (23).

3. A vibrating grid device for improving the quality of flotation column concentrate according to claim 2, characterized in that: The power unit comprises two servo motors (25) respectively arranged on both sides of the flotation column (10). The two servo motors (25) are synchronously driven by a synchronous controller (26). A crank connecting rod (24) for driving the linear slider (22) to perform a reciprocating sliding motion is installed between the servo motor (25) and the linear slider (22) on the same side.

4. A vibrating grid device for improving the quality of flotation column concentrate according to claim 2, characterized in that: The power unit includes a driving screw rod that forms a screw rod and slider structure with the two linear sliders (22). The driving screw rod is driven to rotate by a motor, and the thread directions of the screw rod and the two linear sliders (22) are opposite at the thread connection.

5. A vibrating grid device for improving the quality of flotation column concentrate according to claim 1, 2, 3 or 4, characterized in that: The grid (30) is an arc-shaped structure arranged to fit the inner wall of the flotation column (10). The inner diameter and length of the flotation column (10) are 60 mm and 630 mm respectively. The slurry level in the grid (30) is 580 mm. The length and width of the grid (30) projected along its sliding direction are both 41 mm. The width and thickness of the bars of the grid (30) are both 3 mm. The grid holes of the grid (30) are square structures with a center-to-center distance of 13 mm. The reciprocating one-way stroke of the grid (30) is 10 mm.

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