CN114713382A - A strong mixing shearing device and method suitable for fine-grained mineral flotation - Google Patents

Abstract

The invention relates to a strong mixing and shearing device and a method suitable for fine-grained mineral flotation, belonging to the technical field of mineral flotation stirring and pulping equipment, and solving the problem that the single structure of the stirring and pulping device in the prior art is difficult to meet the needs of fine-grained minerals and flotation. The problem of high dispersion and high collision requirements between selected agents. The present invention includes a sizing bucket, the sizing bucket is sequentially composed of a first-stage strong mixing zone, a second-stage strong shearing zone, and a third-stage strong conveying zone from bottom to top, and the pulp enters the first-stage strong mixing zone from the bottom of the sizing bucket After passing through the second-stage strong shearing zone, it is output from the third-stage strong conveying zone. The strong mixing and shearing device of the invention has good stirring effect and high pulp mixing quality.

Description

A powerful mixing shearing device and method suitable for fine-grained mineral flotation

technical field

The invention relates to the technical field of mineral flotation stirring and pulping equipment, in particular to a strong mixing shearing device and method suitable for fine-grained mineral flotation.

Background technique

Flotation is the most economical and effective separation method for minerals and coal resources, especially for the large-scale recovery of valuable components in low-quality strategic mineral resources such as fine particles and fine particles. The flotation process is carried out according to the surface and interface properties of the particles. The particles with good surface hydrophobicity are easily attached to the air bubbles and float up as concentrates, while the hydrophilic gangue particles remain in the slurry and are discharged as tailings. With the widespread application of mechanized mining and heavy-medium beneficiation processes, problems such as a large amount of flotation fine mud, a large content of fine particles and conjoined organisms, and a narrow effective separation range have become increasingly prominent, which puts forward higher requirements for the mineral flotation process. The flotation equipment and process of some coal preparation plants are difficult to cope with the deterioration of mineral resources, and they are forced to sacrifice the processing capacity to ensure that the flotation index is qualified, resulting in the loss of a large number of high-quality mineral resources. Therefore, the development of high-performance flotation equipment is to solve the problem of clean coal utilization. key move.

Slurry mixing is one of the important links in the flotation process. Its main purpose is to reduce the content of fine mud on the surface of mineral particles, improve the dispersion, collision and adhesion of mineral particles and chemicals, increase the surface and interface properties between different mineral particles, and promote Flotation for efficient separation. Therefore, high-efficiency slurry mixing is a prerequisite for the flotation separation of fine-grained and fine-grained minerals. Since the fine-grained minerals have the characteristics of low density and high specific surface area at the same time, they are easy to adhere to the surface of the target mineral particles during the flotation process, reducing the interaction between the target mineral particles and the flotation reagent, and affecting the surface properties of the target mineral. The traditional stirring and slurry mixing device and method mainly based on a single structure design cannot meet the technical requirements of high dispersion and high collision between fine-grained minerals and flotation reagents. The mixing and shearing device is in urgent need of development and research.

SUMMARY OF THE INVENTION

In view of the above analysis, the embodiments of the present invention aim to provide a strong mixing and shearing device and method suitable for fine-grained mineral flotation, so as to solve the problem that the single structure of the existing stirring and pulping device is difficult to meet the gap between fine-grained minerals and flotation reagents. problems with high dispersion and high collision requirements.

In one aspect, the present invention provides a strong mixing and shearing device suitable for flotation of fine-grained minerals, comprising a pulping barrel, wherein from bottom to top, the pulping barrel is sequentially composed of a first-stage intensive mixing zone, a second-stage strong shearing zone and Three-stage strong conveying zone, the pulp enters the first-stage strong mixing zone from the bottom of the pulp mixing barrel, and is output from the third-stage strong conveying zone after passing through the second-stage strong shearing zone.

Further, an annular baffle is arranged horizontally in the pulping barrel, and two annular baffles are arranged, and the two annular baffles divide the pulping barrel into three sections of structured pulping area from bottom to top. , which are the first-stage strong mixing zone, the second-stage strong shearing zone, and the third-stage strong conveying zone.

Further, there are also sawtooth disk turbo shears in the mixing barrel, and two sawtooth disk turbo shears are provided, and the two sawtooth disk turbo shears are respectively connected with the two serrated disk turbo shears. The annular baffles are flush.

Further, a gap is left between the sawtooth disk turbine shear and the annular baffle.

Further, a baffle plate is installed on the inner wall of the pulp mixing barrel, and the baffle plate is arranged vertically and is provided with a plurality of baffle plates.

Further, it also includes a power unit, the power unit includes a power transmission mechanism, a motor and a main shaft, one end of the main shaft is connected to the motor through the power transmission mechanism, and the other end of the main shaft is connected to the pulp mixing barrel. The barrel is cantilevered.

Further, a semi-circular tube type disc turbine agitator is arranged in the first section of intensive mixing zone, and the semi-circle tube type disc turbine agitator is arranged on the main shaft.

Further, a semi-circular tubular disc turbine agitator is arranged in the second-stage strong shearing zone, and the semi-circular tubular disc turbine agitator is arranged on the main shaft.

Further, a reverse oblique blade disk turbine agitator is arranged in the three-stage strong conveying area, and the reverse oblique blade disk turbine agitator is arranged on the main shaft.

On the other hand, the present invention provides a strong mixing and shearing method suitable for fine-grained mineral flotation, using the above-mentioned strong mixing and shearing device suitable for fine-grained mineral flotation, and the steps include:

Step S1: close the accident discharge pipe and start the motor;

Step S2: Open the pulp discharge pipe, the pulp feed pipe and the dosing pipe in turn, and inject the pulp and chemicals into the pulp mixing barrel;

Step S3: the ore pulp in the first-stage strong mixing zone enters the second-stage strong shearing zone through the annular baffle and the sawtooth disc turbo shear on the lower layer of the pulping barrel;

Step S4: the pulp in the second-stage strong shearing zone is reinforced by shearing and pulping and enters the third-stage strong conveying zone through the upper annular baffle and the sawtooth disc turbo shear;

Step S5: The ore pulp entering the three-stage strong conveying area is driven by the reverse inclined blade disc turbine agitator, and is discharged along the tangential discharge pipe.

Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

(1) The strong mixing and shearing device of the present invention has the technical characteristics of clear equipment structure, interlocking process of pulp mixing, safe and reliable practical application, and the adopted three-stage structural design can meet the functionalization of different stages of pulp mixing process. need. The strong mixing zone of the present invention adopts the combination of the reverse tangential swirling material and the stirring of the semi-circular tubular disc turbine agitator, which improves the suspension dispersion, collision and adhesion of the mineral particles and the agent in the pulp, and helps the mineral surface to stick to the surface. The attached fine mud is stripped, which avoids the influence of mudification on the selectivity of the chemical, and realizes the full contact between the slurry and the chemical. The shear strengthening of the slurry in the radial and axial directions reduces the adverse effect of fine-grained minerals on the stripping of fine mud due to the movement of the surrounding flow, and further enhances the dispersion, collision and adhesion of mineral particles and chemicals; three-stage strong conveying area Through the combination of the reverse inclined-blade disc turbine agitator and the cis-tangential discharge, the rapid discharge of the conditioned pulp is realized, which helps to prevent the adverse effect of over-conditioning on the subsequent flotation, and is a good solution for low-quality pulp. The advanced utilization of mineral materials provides the basis.

(2) The strong mixing and shearing device of the present invention adopts a combination of a semi-circular tubular disc turbine agitator and a reverse inclined-blade disc turbine agitator, which reduces the stirring process while meeting the functional requirements of different stages of the slurry mixing process. Energy consumption and improved pulp mixing efficiency. Compared with the propeller-type stirrer in the common stirring and pulping device, the turbine stirrer adopted in the present invention has high circulation rate and high shear strength, and can reduce the wear and power consumption of the stirrer. At the same time, it is equipped with a sawtooth disc turbine shear, which can maximize the turbulence of the slurry during the stirring process, reduce the adverse effect of fine-grained minerals on the stripping of fine mud due to the movement of the surrounding flow, and enhance the dispersion and collision of mineral particles and chemicals. with adhesion.

(3) The strong mixing shearing device of the present invention adopts the combined design of sawtooth disc turbine shears, shearing grids and vertical baffles, which realizes the shear strengthening of the pulp in the radial and axial directions and reduces the fineness of the pulp. Due to the adverse effect of the surrounding flow motion on the exfoliation of the fine mud, the granular minerals further enhance the dispersion, collision and adhesion between the mineral particles and the agent. The serrated disc turbo shears and the second shearing openings on the surface of the shearing grids are alternately serrated rolling edges design, which maximizes the turbulence of the pulp. At the same time, according to the nature of the incoming material and the needs of on-site production, the shearing effect of the pulp can be adjusted by changing the number of vertical baffles and shear bars, which helps to improve the flexibility and accuracy of the system and avoids the need for material properties. The impact of non-uniform changes on actual production.

(4) The strong mixing shearing device of the present invention is different from the shearing device with the traditional integrated structure design. The structural partition design can improve the energy utilization rate of the stirring process, and is more suitable for the discontinuous change of materials in the actual production process. The first-stage strong mixing zone realizes the suspension dispersion, collision and adhesion of mineral particles and chemicals in the pulp, which is the basic link for processing low-quality difficult-to-pulp mineral particles; the second-stage strong shear zone realizes the radial and axial direction of the pulp. Shear strengthening is the key link in the treatment of low-quality refractory mineral particles; the three-stage strong conveying area realizes the rapid processing of the completed sizing pulp, and is the final link in the treatment of low-quality refractory mineral particles. At the same time, the structural design also facilitates the replacement and maintenance of key components inside the equipment, improving the service life of the equipment.

In the present invention, the above technical solutions can also be combined with each other to achieve more preferred combination solutions. Additional features and advantages of the invention will be set forth in the description which follows, and some of the advantages may become 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 means of particularly pointed out in the description and drawings.

Description of drawings

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

Fig. 1 is the structural representation of the strong mixing shearing device of a specific embodiment;

2 is a schematic diagram of the vertical distribution of shear bars in a specific embodiment;

3 is a schematic diagram of the horizontal distribution of shear bars in a specific embodiment;

4 is a schematic structural diagram of a reverse oblique blade disk turbine agitator of a specific embodiment;

5 is a schematic structural diagram of a semicircular tubular disc turbine agitator according to a specific embodiment;

FIG. 6 is a schematic structural diagram of a sawtooth disk turbo shear according to a specific embodiment.

Reference number:

1- Power transmission structure; 2- Motor; 3- Bearing bracket; 4- Barrel cover plate; 5- Discharge pipe; 6- Reverse inclined blade disc turbine agitator; 7- Main shaft; 8- Vertical baffle ; 81-first shearing port; 9-shearing grid; 91-shearing plate; 92-second shearing port; 93-first shearing tooth; 10-annular partition plate; 11-accident discharge pipe ; 12-semi-circular tubular disc turbine agitator; 13-serrated disc turbine shear; 131-disc main body; 132-second shear teeth; 133-third shear mouth; 14-dosing pipe; 15-feeding pipe;

100-first-stage strong mixing zone; 200-second-stage strong shearing zone; 300-third-stage strong conveying zone.

Detailed ways

The preferred embodiments of the present invention are specifically described below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention, and together with the embodiments of the present invention, are used to explain the principles of the present invention, but not to limit the scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified and limited, the term "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection , which can be mechanical connection, electrical connection, direct connection, or indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

The terms "top," "bottom," "above," "under," and "over" as used throughout the description are relative positions with respect to components of a device, such as top and bottom substrates inside the device relative position. It is understood that the devices are multifunctional regardless of their orientation in space.

Example 1

A specific embodiment of the present invention, as shown in Figure 1, discloses a strong mixing and shearing device suitable for fine mineral flotation (hereinafter referred to as "strong mixing and shearing device"), including a sizing bucket, a sizing bucket From bottom to top, there are a first-stage strong mixing zone 100, a second-stage strong shearing zone 200, and a third-stage strong conveying zone 300. The pulp enters the first-stage strong mixing zone 100 from the bottom of the mixing barrel, and passes through the second-stage strong shearing zone 200. Three-stage strong conveying area 300 outputs. The fine-grained mineral is preferably coal.

Compared with the prior art, the strong mixing shearing device provided in this embodiment is different from the shearing device with the traditional integrated structure design. The structured partition design can improve the energy utilization rate of the stirring process, and is more suitable for materials in the actual production process. Through the structural partition design, the functional conversion of energy in the pulping process is realized, the efficiency of the pulping process is enhanced, the material adaptability and product stability of the equipment are improved, and the non-uniform change in material properties is avoided. The impact of actual production is especially suitable for mixing and slurry mixing before flotation of low-quality fine-grained minerals with high ash and fine mud content.

As shown in Figure 1, the mixing barrel is a cylindrical structure, and the upper end of the mixing barrel is provided with a barrel cover 4. One is to seal the mouth of the mixing barrel to prevent the slurry from overflowing from the mouth of the mixing barrel. Provide space for the power unit.

As shown in FIG. 1 , the power unit includes a power transmission mechanism 1 , a motor 2 and a main shaft 7 . One end of the power transmission mechanism 1 is connected to the output shaft of the motor 2 , and the other end is connected to the upper end of the main shaft 7 to transmit the power of the motor 2 to the main shaft 7 . The power transmission mechanism may be a gear transmission mechanism, a sprocket transmission mechanism or a belt transmission mechanism, preferably, the power transmission mechanism is a belt transmission mechanism.

In this embodiment, the motor 2 transmits the power to the main shaft 7 through the belt transmission mechanism. Compared with the meshing transmission, the belt transmission mechanism has a simple structure, low manufacturing cost, and convenient installation and maintenance. The strong mixing and shearing device runs smoothly during the pulp mixing process and reduces the noise during operation.

Motor 2 is a variable frequency motor, and rotates at a non-uniform speed. The speed is uniformly reciprocated from 600r/s to 800r/s to form a time-uniform flow field, which strengthens the stirring and dispersing of the medicine and increases the energy transmission and distribution gradient, saving electricity.

In order to facilitate the placement of the main shaft 7 , as shown in FIG. 1 , the power unit further includes a bearing bracket 3 , and the bearing bracket 3 is vertically arranged on the barrel cover 4 . It is understood that a through hole is provided in the middle of the barrel cover 4 , the bearing bracket 3 is a cylindrical structure, and bearings are provided at both ends of the bearing bracket 3. The upper end of the main shaft 7 is connected to the bearing in the bearing bracket 3 through the through hole on the barrel cover 4, and the lower end of the main shaft 7 is located in the adjustment in the pulp barrel.

As shown in Figure 1, the upper end of the mixing barrel is provided with a discharge port, and the discharge port is connected with a discharge pipe 5. The discharge pipe 5 is in tangential communication with the mixing barrel, and the discharge direction of the discharge pipe 5 The rotation direction of the main shaft 7 is the same, that is to say, the discharge pipe 5 discharges the material tangentially. It should be noted that the cis-type mentioned in this embodiment means that the pulp discharged from the discharge pipe 5 is discharged along the tangential direction of the pulp mixing barrel and is consistent with the rotation direction of the main shaft 7. The formula is discharged from the discharge pipe 5.

As shown in Figure 1, the lower end of the mixing barrel is provided with a feeding port, and the feeding port is connected with a feeding pipe 15. The feeding pipe 15 is in tangential communication with the mixing barrel, and the feeding direction of the feeding pipe 15 is the same as that of the feeding pipe 15. The rotation direction of the main shaft 7 is opposite, that is to say, the feed pipe 15 feeds the material counter tangentially. It should be noted that the reverse type mentioned in this embodiment means that the feeding direction of the feeding pipe 15 is opposite to the rotation direction of the main shaft 7, and the slurry rotates from the feeding pipe 15 along the tangential direction of the mixing barrel against the main shaft 7. direction into the mixing barrel.

In this embodiment, the main shaft 7 is located in the center of the mixing barrel through the barrel cover 4, and the distance between the bottom end of the main shaft 7 and the bottom of the mixing barrel is 1/4 to 3/4 of the diameter of the feeding pipe 15, preferably , the distance between the bottom end of the main shaft 7 and the bottom of the mixing barrel is 1/2 of the diameter of the feeding pipe 15 .

Considering that the equipment may fail during the mixing process, as shown in Figure 1, the lower end of the mixing barrel is provided with an accident discharge port, and the accident discharge port is connected with an accident discharge pipe 11. The accident discharge pipe 11 and the pulp mixing The barrels are connected tangentially, and the discharge direction of the accident discharge pipe 11 is the same as the rotation direction of the main shaft 7 , that is, the accident discharge pipe 11 discharges material tangentially. The ore pulp is discharged from the accident discharge pipe 11 along the tangential direction of the pulp mixing barrel along the rotation direction of the main shaft 7 .

It is worth noting that, as shown in Figure 1, the discharge pipe 5 and the feed pipe 15 are located on the same side of the mixing barrel, and the accident discharge pipe 11 and the feeding pipe 15 are located on both sides of the mixing barrel.

As shown in FIG. 1 , there are annular partitions 10 horizontally arranged in the mixing bucket, and two annular partitions 10 are provided, and the two annular partitions 10 divide the mixing bucket into three sections of structured mixing areas from bottom to top. , which are a first-stage strong mixing zone 100 , a second-stage strong shearing zone 200 and a third-stage strong conveying zone 300 . The height ratio of the three-stage pulp mixing zone is 1:1:1 or 1:2:1. Preferably, the height ratio of the first-stage intensive mixing zone 100, the second-stage strong shearing zone 200 and the third-stage intensive conveying zone 300 is 1 :1:1.

In this embodiment, the first-stage strong mixing zone 100 realizes the suspension, dispersion, collision and adhesion of mineral particles and chemicals in the pulp, which is the basic link for processing low-quality and difficult-to-pulp mineral particles; the second-stage strong shear zone 200 realizes the mineral pulp Shear strengthening in the radial and axial directions is the key link in the treatment of low-quality refractory mineral particles; the three-stage strong conveying zone 300 realizes rapid treatment of the completed slurried ore pulp, which is the key to processing low-quality refractory mineral particles. The final link of the pellet.

As shown in Figure 1 and Figure 3, a baffle 8 is installed on the inner barrel wall of the mixing barrel, the baffle 8 is vertically arranged, and there are multiple baffles 8, and the plurality of baffles 8 are annular along the horizontal interface of the mixing barrel. Distribution, the number of baffles 8 is 4-8, preferably, the number of baffles 8 is 8.

In order to enhance the shearing effect on the ore pulp, as shown in FIG. Understandably, the number of the first shearing openings 81 on the baffle plate 8 can be controlled to adjust the shearing effect on the ore pulp. The greater the number of the first shearing openings 81, the better the shearing effect on the ore pulp.

As shown in FIG. 1 and FIG. 5 , a section of intensive mixing zone 100 is provided with a semi-circular tubular disc turbine agitator 12 . The diameter of the semi-circular tubular disc turbine agitator 12 is 1/3 to 2/3 of the diameter of the mixing barrel, preferably, the diameter of the semi-circular tubular disk turbine agitator 12 is 1/3 of the diameter of the mixing bucket.

In this embodiment, the first section of strong mixing zone 100 adopts the combination of reverse tangential swirling inflow material and semi-circular tubular disc turbine agitator 12 to improve the dispersion, collision and adhesion between mineral particles and chemicals in the slurry, and there are It helps to remove the fine mud adhering to the surface of the target mineral, and avoids the influence of the mudding phenomenon on the selectivity of the agent.

As shown in Fig. 1, Fig. 2, Fig. 5, the second-stage strong shearing zone 200 is provided with a shearing grid 9 and a semi-circular tubular disc turbine agitator 12, and the shearing grid 9 is in the second-stage strong shearing zone 200 is evenly distributed in a ring shape, and is fixed on the annular partition plate 10 by bolts, that is, the upper and lower ends of the shear bar 9 are respectively connected with the two annular partition plates 10 arranged in the mixing barrel. The number of shear bars 9 is generally 4 to 8. Preferably, there are 8 shear bars 9 in the second-stage strong shear zone 200 . It is worth noting that, as shown in FIG. 3 , the shear bars 9 are located in front of the baffle 8 and are arranged corresponding to the baffle 8 .

Further, as shown in FIG. 2 , the shearing grid 9 includes a shearing plate 91 . The shearing plate 91 is provided with a second shearing opening 92 , and the second shearing opening 92 is provided along the length direction of the shearing plate 91 . There are multiple first shearing teeth 93 on both sides of the shearing plate 91 , the first shearing teeth 93 on both sides of the shearing plate 91 are triangular, and the first shearing teeth 93 on both sides of the shearing plate 91 are connected It has a zigzag shape, and the adjacent first shearing teeth 93 are bent alternately with the shearing plate 91 as the interface, forming a zigzag-shaped winding blade structure. The bending angle of the first shearing teeth 93 ranges from 30° to 60°, preferably 50°.

As shown in FIG. 1 and FIG. 5 , in the second-stage strong shearing zone 200 , the semi-circular tubular disc turbine agitator 12 is arranged on the main shaft 7 and is rotated under the driving of the motor 2 . The diameter of the semi-circular tubular disc turbine agitator 12 is 1/3 to 2/3 of the diameter of the mixing barrel, preferably, the diameter of the semi-circular tubular disk turbine agitator 12 is 1/3 of the diameter of the mixing bucket.

As shown in FIG. 1 , there is also a sawtooth disk turbine shear 13 in the mixing barrel, and two sawtooth disk turbine shears 13 are provided, and the two sawtooth disk turbine shears 13 are respectively connected with two annular The baffle plate 10 is arranged flush, and a gap is left between the sawtooth disk turbine shear 13 and the annular baffle plate 10 . The size of the gap is 1/20-1/15 of the diameter of the pulping barrel, and preferably, the gap between the sawtooth disk turbine shear 13 and the annular partition 10 is 1/20 of the size of the pulping barrel. The diameter of the sawtooth disk turbo shears 13 is 1/3 to 2/3 of the diameter between the sizing buckets, preferably, the diameter of the sawtooth disk turbo shears 13 is 1/3 of the diameter between the sizing buckets.

As shown in FIG. 6 , the sawtooth disc turbo shear 13 includes a disc main body 131 and a second shearing tooth 132. The second shearing tooth 132 is provided on the circumferential edge of the disc main body 131, and the adjacent second shearing teeth 132 The cutting teeth 132 are bent alternately with the disc main body 131 as the interface, that is, one connected second cutting tooth 132 is curved toward the upper surface of the disc main body 131 , and the other is curved toward the lower surface of the disc main body 131 . The bending angle of the second shearing teeth 132 ranges from 15° to 75°, preferably 45°.

It is worth noting that the curved curved surface of the second shearing teeth 132 is an oblique surface, rather than being curved tangentially to the disc body 131 , so that the second shearing teeth 132 can push the pulp to stir.

In order to enhance the shearing effect of the sawtooth disk turbo shear 13, as shown in FIG. 6, the sawtooth disk turbo shear 13 is further provided with a third cutting opening 133, and the third cutting opening 133 surrounds the main body of the disk 131 has a central annular distribution. Preferably, the third cutting opening 133 is a rectangular opening, the sheet material cut from the third cutting opening 133 is vertically welded on the bottom surface of the disc main body 131, and is located at the third cutting opening 133 and the sawtooth disc turbine shear The cutter 13 is turned to the opposite side, so that the pulp passes through the third cutting opening 133 under the blocking of the sheet.

In this embodiment, the sawtooth disk turbo shears 13 and the shearing grids 9 are both provided with cutting openings, and the edges are alternately arranged with a sawtooth-like winding blade structure, which can realize the shearing of the pulp in the radial and axial directions. Cut strengthening to maximize pulp turbulence.

In this embodiment, the combination of the shear grating 9 and the sawtooth disk turbine shear 13 realizes the shear strengthening of the pulp in the radial and axial directions, and reduces the effect of the fine-grained minerals on the exfoliation of the fine mud due to the movement of the surrounding flow. The adverse effect further enhances the dispersion, collision and adhesion of the target mineral and the agent.

As shown in Figures 1 and 4, the three-stage strong conveying area 300 is provided with a reverse inclined blade disk turbine agitator 6, and the reverse inclined blade disk turbine agitator 6 is arranged on the main shaft 7, and is driven by the motor 2. turn down. The diameter of the reverse inclined-blade disc turbine agitator 6 is 1/3 to 2/3 of that between the mixing barrels. /3.

In this embodiment, the three-stage strong conveying area 300 is combined with the cis tangential discharge through the reverse inclined blade disc turbine agitator 6, so as to realize the rapid discharge of the conditioned pulp, which is helpful to prevent overshooting. The adverse effect of pulp on subsequent flotation provides a basis for the intensive upgrading and utilization of low-quality mineral materials.

It should be noted that the feeding pipe 15 is connected with the dosing pipe 14, and the discharge pipe 5, the slurry feeding pipe 15 and the dosing pipe 14 are provided with numerical control electromagnetic valves, and the discharge pipe 5 and the pulp are controlled by the numerical control electromagnetic valve. The opening and closing of the feeding tube 15 and the dosing tube 14.

Example 2

A specific embodiment of the present invention discloses a strong mixing and shearing method suitable for fine-grained mineral flotation (hereinafter referred to as "strong mixing and shearing method"), using the strong mixing and shearing device of Example 1, and the steps include:

Step S1 : close the accident discharge pipe 11 and start the motor 2 .

Before stirring and mixing, the accident discharge pipe 11 is closed in advance through the numerical control electromagnetic valve, and then the motor 2 is started; The turbine agitator 12 and the sawtooth disc turbine shear 13 rotate.

Step S2: After the slurry mixing barrel runs stably, open the pulp discharge pipe 5, the pulp feed pipe 15 and the dosing pipe 14 in sequence through the numerically controlled electromagnetic valve. The pulp enters a section of strong mixing zone 100 at the bottom of the pulp mixing barrel tangentially through the pulp feeding pipe 15 to form a swirling flow, and forms a countercurrent collision with the rotating semi-circular tubular disc turbine agitator 12 . Negative pressure is formed when the ore slurry passes through the dosing pipe 14, and the collector and foaming agent in the dosing pipe 14 are self-absorbed into the ore slurry under the action of pressure, and are rotated by the high-speed semi-circular tubular disc turbine agitator 12. Suspended dispersion.

Wherein the collector selects kerosene, diesel oil or pine oil, preferably diesel oil; the dosage is 0.5～4kg/t, preferably 0.5kg/t; the foaming agent selects sec-octanol, methyl isobutyl methanol, methyl amyl alcohol or ten Dialkyltrimethylammonium bromide, preferably sec-octanol; the dosage is 0.2-2kg/t, preferably 0.2kg/t.

The first section of strong mixing zone 100 adopts the structure design of reverse tangential swirling material and semi-circular tubular disc turbine agitator 12, which improves the suspension, dispersion, collision and adhesion of mineral particles and chemicals in the pulp, which is beneficial to the surface of the target mineral. The adhered fine particles are peeled off, which avoids the influence of sliming phenomenon on the selectivity of the chemical, and realizes the full contact between the slurry and the chemical.

Step S3: The pulp in the first-stage strong mixing zone 100 enters the second-stage strong shearing zone 200 through the annular baffle 10 and the serrated disk turbo shear 13 on the lower layer of the pulping barrel, and the ring-shaped serrated disk turbo shear 13 is opened on the surface. The shearing port (the third shearing port 133 is surrounded by) and the serrated winding edge with alternating up and down edges (the second shearing teeth 132 are alternately bent and formed) form a strong shearing effect on the passing ore pulp.

Step S4 : the pulp in the second-stage strong shearing zone 200 passes through the shearing grid 9 between the two annular partitions 10 under the stirring of the semi-circular tubular disc turbine agitator 12 , and the second shearing grid on the surface of the shearing grid 9 . The notch 91 and the serrated winding edge (formed by the first shear teeth 93) further shear strengthen the pulp. At the same time, the vertical baffle plate 8 on the wall of the mixing barrel also forms an obstacle to the rotating pulp, which helps to improve the turbulence of the pulp. The ore pulp after intensive shearing and pulping enters the three-stage strong conveying area 300 through the upper annular partition 10 and the sawtooth disk turbine shear 13 .

The combined design of the shear grid 9 and the sawtooth disc turbine shear 13 in the second-stage strong shear zone 200 realizes the shear strengthening of the pulp in the radial and axial directions, and reduces the impact of fine-grained minerals due to the movement of the surrounding flow. The adverse effect of fine mud stripping further enhances the dispersion, collision and adhesion between the mineral particles and the agent, which is a key link in the treatment of low-quality mineral particles that are difficult to adjust.

Step S5: The ore pulp entering the three-stage strong conveying area 300 is driven by the reverse inclined blade disc turbine agitator 6, and is discharged along the tangential discharge pipe 5, so as to realize the rapid processing of the completed sizing slurry, It helps to prevent the adverse effects of excessive sizing on subsequent flotation, and is the final link in the treatment of low-quality difficult-to-sizing mineral particles.

It should be noted that, according to the nature of the incoming material and the needs of on-site production, the regulation of the shearing effect of the pulp can also be achieved by changing the number of the baffles 8 and the shearing grids 9 . When the nature of the mineral particles is complex and the fine mud content is large (difficult to flotation), the number of baffles 8 and shear bars 9 can be increased to enhance the shear slurry mixing effect; when the mineral particles are uniform in nature and the fine mud content is low (easy to float). During flotation), the number of vertical baffles 8 and shear bars 9 can be reduced, the throughput of ore pulp can be increased, and the processing capacity of the equipment can be increased. When the equipment fails or is overhauled, the ore pulp in the mixing barrel can be released through the accident discharge pipe 11 for overhaul operations. At the same time, the structural design is also conducive to the adjustment, replacement and maintenance of key components, and improves the service life of the equipment.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Substitutions should be covered within the protection scope of the present invention.

Claims (10)

1. The strong mixing and shearing device is characterized by comprising a pulp mixing barrel, wherein the pulp mixing barrel is sequentially provided with a first strong mixing area (100), a second strong shearing area (200) and a third strong conveying area (300) from bottom to top, ore pulp enters the first strong mixing area (100) from the bottom of the pulp mixing barrel and is output from the third strong conveying area (300) after passing through the second strong shearing area (200).

2. The strong mixing and shearing device for the flotation of fine minerals is characterized in that two annular partition plates (10) are horizontally arranged in the mixing barrel, and the two annular partition plates (10) divide the mixing barrel into three sections of structured mixing zones from bottom to top, namely the first section of strong mixing zone (100), the second section of strong shearing zone (200) and the third section of strong conveying zone (300).

3. The powerful mixing and shearing device for flotation of fine minerals as claimed in claim 2, wherein two serrated disc turbine cutters (13) are arranged in the mixing barrel, and the two serrated disc turbine cutters (13) are respectively arranged flush with the two annular partition plates (10).

4. A strong mixing and shearing device suitable for the flotation of fine minerals according to claim 3, characterised in that a gap is left between said serrated disk turbine shears (13) and said annular partition (10).

5. The intensive mixing and shearing device for the flotation of fine minerals as claimed in any one of claims 1 to 4, wherein the inner wall of the mixing barrel is provided with a baffle (8), and the baffle (8) is vertically arranged and provided with a plurality of baffles.

6. The powerful mixing and shearing device for flotation of fine minerals is characterized by further comprising a power unit, wherein the power unit comprises a power transmission mechanism (1), a motor (2) and a main shaft (7), one end of the main shaft (7) penetrates out of the size mixing barrel and is connected with the motor (2) through the power transmission mechanism (1), and the other end of the main shaft is in a cantilever shape in the size mixing barrel.

7. The intensive mixing and shearing device for fine mineral flotation according to claim 6, wherein a semicircular tubular disk turbine agitator (12) is arranged in the section of intensive mixing zone (100), and the semicircular tubular disk turbine agitator (12) is arranged on the main shaft (7).

8. The powerful mixing and shearing device for flotation of fine minerals as claimed in claim 6, wherein a semi-circular tubular disk turbine agitator (12) is arranged in the two-stage powerful shearing zone (200), and the semi-circular tubular disk turbine agitator (12) is arranged on the main shaft (7).

9. The powerful mixing and shearing device for flotation of fine minerals as claimed in claim 6, wherein a reverse pitched blade disc turbine agitator (6) is arranged in the three sections of powerful conveying zones (300), and the reverse pitched blade disc turbine agitator (6) is arranged on the main shaft (7).

10. An intensive mixing and shearing method suitable for the flotation of fine minerals, which is characterized by adopting the intensive mixing and shearing device suitable for the flotation of fine minerals, as claimed in claims 1 to 9, and comprising the following steps:

step S1: closing the accident discharging pipe (11) and starting the motor (2);

step S2: opening an ore pulp discharging pipe (5), an ore pulp feeding pipe (15) and a chemical adding pipe (14) in sequence, and injecting ore pulp and a chemical into the pulp mixing barrel;

step S3: the ore pulp in the first-stage strong mixing zone (100) enters a second-stage strong shearing zone (200) through an annular partition plate (100) at the lower layer of the pulp mixing barrel and a sawtooth disc turbine shearing device (13);

step S4: the ore pulp in the second-section powerful shearing zone (200) enters a third-section powerful conveying zone (300) through an upper-layer annular partition plate (10) and a sawtooth disc turbine shearer (13) after being subjected to reinforced shearing and pulp mixing;

step S5: the ore pulp entering the three-section strong conveying area (300) is driven by a reverse inclined blade disc turbine stirrer (6) to be discharged along the tangential discharging pipe (5) in a cis-form manner.

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