CN114713382A - Strong mixing and shearing device and method suitable for fine mineral flotation - Google Patents
Strong mixing and shearing device and method suitable for fine mineral flotation Download PDFInfo
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- CN114713382A CN114713382A CN202111403460.5A CN202111403460A CN114713382A CN 114713382 A CN114713382 A CN 114713382A CN 202111403460 A CN202111403460 A CN 202111403460A CN 114713382 A CN114713382 A CN 114713382A
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- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
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Abstract
The invention relates to a strong mixing and shearing device and a strong mixing and shearing method suitable for fine-grained mineral flotation, belongs to the technical field of mineral flotation stirring and size mixing equipment, and solves the problem that a stirring and size mixing device in the prior art is single in structure and cannot meet the requirements of high dispersion and high collision between fine-grained minerals and flotation reagents. The invention comprises a pulp mixing barrel which is sequentially provided with a first section of strong mixing area, a second section of strong shearing area and a third section of strong conveying area from bottom to top, wherein ore pulp enters the first section of strong mixing area from the bottom of the pulp mixing barrel and is output from the third section of strong conveying area after passing through the second section of strong shearing area. The strong mixing and shearing device has good stirring effect and high pulp mixing quality.
Description
Technical Field
The invention relates to the technical field of mineral flotation stirring and size mixing equipment, in particular to a strong mixing and shearing device and method suitable for fine mineral flotation.
Background
Flotation is the most economic and effective separation method for mineral and coal resources, and particularly has outstanding contribution to large-scale recovery of valuable components in low-quality strategic mineral resources such as fine particles, micro-fine particles and the like. The flotation process is carried out according to the surface interface property of particles, the particles with good surface hydrophobicity are easy to attach with bubbles to float as concentrate, and hydrophilic gangue particles are left in ore pulp to be discharged as tailings. With the common application of mechanized mining and dense medium beneficiation processes, the problems of large amount of floating fine mud, large content of fine particles and intergrowths, narrow effective separation range and the like are increasingly highlighted, and higher requirements are put forward for the mineral flotation process. Some flotation equipment and processes in coal preparation plants are difficult to cope with the deterioration of mineral resources, and are forced to ensure that flotation indexes are qualified by sacrificing treatment capacity, so that a large amount of high-quality mineral resources are lost, and therefore, the development of high-performance flotation equipment is a key measure for solving the problem of clean utilization of coal.
Size mixing is one of the important links of the flotation process, and the main purposes of the size mixing are to reduce the content of fine mud on the surfaces of mineral particles, improve the dispersion, collision and adhesion of the mineral particles and medicaments, increase the surface interface property difference among different mineral particles and promote the efficient separation of flotation. Therefore, efficient size mixing is a prerequisite for the flotation separation of fine and micro-fine minerals. Because the micro-fine particle minerals have the characteristics of low density and high specific surface area, the micro-fine particle minerals are easily adhered to the surface of target mineral particles in the flotation process, the interaction between the target mineral particles and the flotation reagent is reduced, and the influence is generated on the surface properties of the target mineral. The traditional stirring and size mixing device and method mainly designed by a single structure are difficult to meet the technical requirements of high dispersion and high collision between fine-grained minerals and flotation reagents, so a strong mixing and shearing device suitable for flotation of fine-grained and fine-grained minerals needs to be developed and researched urgently.
Disclosure of Invention
In view of the above analysis, the embodiments of the present invention are directed to provide a strong mixing and shearing apparatus and method suitable for fine mineral flotation, so as to solve the problem that the existing stirring and size mixing apparatus has a single structure and is difficult to meet the requirements of high dispersion and high collision between fine minerals and flotation reagents.
On one hand, the invention provides a strong mixing and shearing device suitable for fine mineral flotation, which comprises a pulp mixing barrel, wherein the pulp mixing barrel is sequentially provided with a first strong mixing area, a second strong shearing area and a third strong conveying area from bottom to top, and ore pulp enters the first strong mixing area from the bottom of the pulp mixing barrel and is output from the third strong conveying area after passing through the second strong shearing area.
Furthermore, the inside of the size mixing barrel is horizontally provided with two annular partition plates, and the two annular partition plates divide the size mixing barrel into three sections of structured size mixing zones from bottom to top, namely the first section of strong mixing zone, the second section of strong shearing zone and the third section of strong conveying zone.
Furthermore, a saw-tooth disc turbine shears are further arranged in the size mixing barrel, the number of the saw-tooth disc turbine shears is two, and the two saw-tooth disc turbine shears are respectively flush with the two annular partition plates.
Further, a gap is left between the serrated disc turbine cutter and the annular partition plate.
Further, the baffle is installed to the inner wall of size mixing bucket, the baffle is vertical to be set up, and is equipped with a plurality ofly.
Further, still include power pack, power pack includes power transmission mechanism, motor and main shaft, the one end of main shaft is worn out the size mixing bucket pass through power transmission mechanism with the motor is connected, and the other end is in be cantilever shape in the size mixing bucket.
Furthermore, a semicircular pipe type disc turbine stirrer is arranged in the strong mixing area and is arranged on the main shaft.
Furthermore, a semicircular tubular disc turbine stirrer is arranged in the two-section strong shearing area and is arranged on the main shaft.
Furthermore, a reverse oblique blade disc turbine stirrer is arranged in the three-section powerful conveying area and is arranged on the main shaft.
In another aspect, the present invention provides a strong mixing and shearing method suitable for fine mineral flotation, which uses the above strong mixing and shearing device suitable for fine mineral flotation, and includes the steps of:
step S1: closing the accident discharging pipe and starting the motor;
step S2: opening an ore pulp discharging pipe, an ore pulp feeding pipe and a chemical adding pipe in sequence, and injecting ore pulp and a chemical into the pulp mixing barrel;
step S3: the ore pulp in the first-section powerful mixing zone enters a second-section powerful shearing zone through an annular partition plate at the lower layer of the pulp mixing barrel and the sawtooth disc turbine shears;
step S4: the ore pulp in the second-section powerful shearing area enters a third-section powerful conveying area through an upper-layer annular partition plate and a sawtooth disc turbine shearer after being subjected to reinforced shearing and size mixing;
step S5: and the ore pulp entering the three-section powerful conveying area is discharged in a cis-form manner along the tangential discharge pipe under the driving of a reverse inclined blade disc turbine stirrer.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
(1) the powerful mixing and shearing device has the technical characteristics of clear equipment structure layers, annular buckling in the size mixing process and safe and reliable practical application, and the adopted three-section structural design can meet the functional requirements of different stages in the size mixing process. According to the invention, the reverse tangential rotational flow feeding and the stirring of the semicircular tubular disc turbine stirrer are combined in the first section of the strong mixing area, so that the suspension dispersion, collision and adhesion of mineral particles and a medicament in the ore pulp are improved, the fine mud adhered to the surface of the mineral is favorably stripped, the influence of the argillization phenomenon on the medicament selectivity is avoided, and the full contact between the ore pulp and the medicament is realized; the shearing bar grids and the sawtooth disc turbine shears additionally arranged in the two-section powerful shearing area realize the shearing strengthening of the ore pulp in the radial direction and the axial direction, reduce the adverse effect of the fine-grained minerals on the fine mud stripping due to the streaming motion, and further enhance the dispersion, collision and adhesion of mineral particles and medicaments; the three sections of powerful conveying areas are combined with cis-form tangential discharging through the reverse inclined blade disc turbine stirrer, so that the pulp after size mixing is quickly discharged, the adverse effect of over size mixing on subsequent flotation is favorably prevented, and a foundation is provided for fine and deep upgrading and utilization of low-quality mineral materials.
(2) The powerful mixing and shearing device disclosed by the invention adopts the combination of the semicircular tubular disc turbine stirrer and the reverse inclined blade disc turbine stirrer, so that the energy consumption in the stirring process is reduced and the pulp mixing efficiency is improved while the functional requirements of different stages in the pulp mixing process are met. Compared with a propeller type stirrer in a common stirring and size mixing device, the turbine stirrer adopted by the invention has high circulation rate and high shearing strength, and can reduce the abrasion and power consumption of the stirrer. Meanwhile, the serrated disc turbine shear is matched to improve the pulp turbulence degree in the stirring process to the maximum extent, reduce the adverse effect of the fine-grained minerals on fine mud stripping due to the streaming motion, and enhance the dispersion, collision and adhesion of mineral particles and medicaments.
(3) The powerful mixing and shearing device disclosed by the invention adopts the combined design of the saw-tooth disc turbine shears, the shearing bar grids and the vertical baffle plate, so that the shearing reinforcement of the ore pulp in the radial direction and the axial direction is realized, the adverse effect of the streaming motion of fine-grained minerals on the fine mud stripping is reduced, and the dispersion, collision and adhesion between mineral particles and medicaments are further enhanced. The design of the sawtooth disc turbine shears and the alternative sawtooth edge curling of the second shearing opening and the edge on the surface of the shearing bar grid improves the pulp turbulence degree to the maximum extent. Meanwhile, according to the feeding property and the field production requirement, the regulation and control of the ore pulp shearing action can be realized by changing the number of the vertical baffles and the shearing bars, the system flexibility and accuracy can be improved, and the influence on the actual production caused by the non-uniform change of the material property is avoided.
(4) The powerful mixing and shearing device is different from a shearing device with a traditional integrated structure design, is structurally and sectionally designed to improve the energy utilization rate in the stirring process, and is more suitable for the discontinuous change of materials in the actual generation process. The first-stage strong mixing zone realizes suspension dispersion, collision and adhesion of mineral particles and medicaments in the ore pulp, and is a basic link for treating low-quality mineral particles difficult to size mixing; the two-stage strong shearing area realizes the shearing strengthening of the ore pulp in the radial direction and the axial direction, and is a key link for processing low-quality mineral particles difficult to size mixing; the three sections of strong conveying areas realize the rapid treatment of the pulp which is finished with size mixing, and are the final link for treating low-quality mineral particles which are difficult to be mixed. Meanwhile, due to the structural design, the key parts in the equipment can be conveniently replaced and maintained, and the service life of the equipment is prolonged.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic diagram of an embodiment of an intensive mixing and shearing device;
FIG. 2 is a schematic view of a vertical distribution of a shear bar grid according to an embodiment;
FIG. 3 is a schematic diagram of a horizontal distribution of shear bars according to an embodiment;
FIG. 4 is a schematic diagram of a reverse pitched blade disc turbine agitator configuration according to an exemplary embodiment;
FIG. 5 is a schematic view of a semi-circular tubular disk turbine agitator according to an exemplary embodiment;
FIG. 6 is a schematic diagram of a serrated disk turbine cutter in accordance with an exemplary embodiment.
Reference numerals:
1-a power transmission structure; 2, a motor; 3-a bearing support; 4-a cover plate of the barrel body; 5, a discharge pipe; 6-reverse inclined blade disc turbine stirrer; 7-a main shaft; 8-vertical baffles; 81-a first shear port; 9-shearing the bar grating; 91-a shear plate; 92-a second shear port; 93-first cutting teeth; 10-an annular partition; 11-accident discharge pipe; 12-a semi-circular tubular disk turbine agitator; 13-a serrated disk turbine cutter; 131-a disc body; 132-second cutting tooth; 133-third shear orifice; 14-a medicine feeding pipe; 15-a feeding pipe;
100-a section of intensive mixing zone; 200-two sections of strong shearing zones; 300-three sections of powerful conveying areas.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention and not to limit its scope.
In the description of the embodiments of the present invention, it should be noted that the term "connected" is to be understood broadly, and may be, for example, fixed, detachable, or integrally connected, and may be mechanically or electrically connected, and may be directly or indirectly connected through an intermediate medium, unless otherwise specifically stated or limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The terms "top," "bottom," "above … …," "below," and "on … …" as used throughout the description are relative positions with respect to components of the device, such as the relative positions of the top and bottom substrates inside the device. It will be appreciated that the devices are multifunctional, regardless of their orientation in space.
Example 1
One embodiment of the present invention, as shown in fig. 1, discloses a strong mixing and shearing device (hereinafter referred to as "strong mixing and shearing device") suitable for fine mineral flotation, which comprises a size mixing barrel, wherein the size mixing barrel is sequentially provided with a first strong mixing zone 100, a second strong shearing zone 200 and a third strong conveying zone 300 from bottom to top, and ore pulp enters the first strong mixing zone 100 from the bottom of the size mixing barrel and is output from the third strong conveying zone 300 after passing through the second strong shearing zone 200. The fine grained mineral is preferably coal.
Compared with the prior art, the powerful mixing and shearing device provided by the embodiment is different from a shearing device with a traditional integrated structure design, is structurally and sectionally designed to improve the energy utilization rate in the stirring process, and is more suitable for the discontinuous change of materials in the actual generation process; the functional conversion of the energy of the size mixing process is realized through the structural partition design, the efficiency of the size mixing process is enhanced, the material adaptability and the product stability of equipment are improved, the influence on the actual production due to the non-uniform change of the material properties is avoided, and the method is particularly suitable for stirring and size mixing before the flotation of low-quality fine-grained minerals with high ash and fine mud content.
As shown in fig. 1, the size mixing barrel is of a cylindrical structure, and a barrel cover plate 4 is arranged at the upper end of the size mixing barrel, so that firstly, the opening of the size mixing barrel is sealed, the ore pulp is prevented from overflowing from the opening of the size mixing barrel, and secondly, a placing space is provided for a power unit.
As shown in fig. 1, the power unit includes a power transmission mechanism 1, a motor 2 and a main shaft 7, wherein one end of the power transmission mechanism 1 is connected to an output shaft of the motor 2, and the other end is connected to an upper end of the main shaft 7, so as to transmit the power of the motor 2 to the main shaft 7. The power transmission mechanism can be a gear transmission mechanism, a chain wheel transmission mechanism or a belt transmission mechanism, and preferably, the power transmission mechanism is a belt transmission mechanism.
In this embodiment, motor 2 passes through belt drive mechanism and gives main shaft 7 with power transmission, compares with the meshing transmission, and belt drive mechanism simple structure, low in manufacturing cost, installation maintenance is convenient, because the belt is rich in elasticity, can alleviate impact and vibration for powerful mixed shearing mechanism operates steadily at the size mixing in-process, reduces the during operation noise.
The motor 2 is a variable frequency motor and rotates at a non-uniform speed, the speed is uniformly changed from 600r/s to 800r/s in a reciprocating mode to form a time-nonuniform flow field, the stirring and dispersing of the medicament are enhanced, the energy transmission and distribution gradient is increased, and the electricity consumption is saved.
In order to facilitate the placement of the main shaft 7, as shown in fig. 1, the power unit further includes a bearing support 3, the bearing support 3 is vertically disposed on the barrel cover plate 4, understandably, a through hole is disposed in the middle of the barrel cover plate 4, the bearing support 3 is of a cylindrical structure, bearings are disposed at two ends of the bearing support 3, the upper end of the main shaft 7 penetrates through the through hole on the barrel cover plate 4 to be connected with the bearings in the bearing support 3, and the lower end of the main shaft 7 is located in the size mixing barrel.
As shown in fig. 1, a discharge port is arranged at the upper end of the size mixing barrel, a discharge pipe 5 is connected to the discharge port, the discharge pipe 5 is in tangential communication with the size mixing barrel, and the discharge direction of the discharge pipe 5 is consistent with the rotation direction of the main shaft 7, that is, the discharge pipe 5 discharges tangentially in cis. In this embodiment, the slurry discharged from the discharge pipe 5 is discharged in a direction tangential to the surge tank and in the same direction as the rotation direction of the main shaft 7, and the slurry stirred in this configuration is discharged from the discharge pipe 5 in a straight-line manner.
As shown in fig. 1, a feeding port is arranged at the lower end of the size mixing barrel, a feeding pipe 15 is connected to the feeding port, the feeding pipe 15 is communicated with the size mixing barrel in a tangent manner, and the feeding direction of the feeding pipe 15 is opposite to the rotating direction of the main shaft 7, that is, the feeding pipe 15 feeds materials in an inverse tangential manner. It should be noted that, the reverse type 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 enters the mixing barrel from the feeding pipe 15 along the tangential direction of the mixing barrel against the rotation direction of the main shaft 7.
In the embodiment, the main shaft 7 penetrates through the barrel cover plate 4 and is located at the center of the pulp mixing barrel, the distance from the bottom end of the main shaft 7 to the bottom of the pulp mixing barrel is 1/4-3/4 of the diameter of the feeding pipe 15, and preferably, the distance from the bottom end of the main shaft 7 to the bottom of the pulp mixing barrel is 1/2 of the diameter of the feeding pipe 15.
Considering that the equipment may be out of order in the slurry mixing process, as shown in fig. 1, the lower end of the slurry mixing barrel is provided with an accident discharging opening, the accident discharging opening is connected with an accident discharging pipe 11, the accident discharging pipe 11 is communicated with the slurry mixing barrel in a tangential manner, and the discharging direction of the accident discharging pipe 11 is the same as the rotating direction of the main shaft 7, that is, the accident discharging pipe 11 discharges materials in a cis-form tangential manner. The ore pulp is discharged along the direction of the rotation of the main shaft 7 along the tangential direction of the size mixing barrel from an accident discharging pipe 11.
It should be noted that, as shown in fig. 1, the discharging pipe 5 and the feeding pipe 15 are located on the same side of the size mixing barrel, and the emergency discharging pipe 11 and the feeding pipe 15 are located on both sides of the size mixing barrel.
As shown in fig. 1, two annular partition plates 10 are horizontally arranged in the size mixing barrel, and the two annular partition plates 10 divide the size mixing barrel into three structured size mixing zones from bottom to top, namely a first strong mixing zone 100, a second strong shearing zone 200 and a third strong conveying zone 300. The height ratio of the three size mixing areas is 1: 1: 1 or 1: 2: 1, preferably, the ratio of the heights of the primary intensive mixing zone 100, the secondary intensive shearing zone 200 and the tertiary intensive conveying zone 300 is 1: 1: 1.
in the embodiment, the first-stage strong mixing zone 100 realizes the suspension dispersion, collision and adhesion of mineral particles and medicaments in the ore pulp, and is a basic link for treating low-quality mineral particles difficult to pulp; the two-stage strong shearing zone 200 realizes the shearing strengthening of the ore pulp in the radial direction and the axial direction, and is a key link for processing low-quality mineral particles difficult to size mixing; the three-stage strong conveying area 300 realizes the rapid treatment of the pulp which is subjected to size mixing and is the final link for treating low-quality mineral particles which are difficult to size mixing.
As shown in fig. 1 and 3, a baffle 8 is installed at the inner barrel wall of the size mixing barrel, the baffle 8 is vertically arranged, the baffles 8 are arranged in a plurality, the baffles 8 are annularly distributed along the horizontal interface of the size mixing barrel, the number of the baffles 8 is 4-8, and preferably, the number of the baffles 8 is 8.
In order to enhance the shearing effect on the slurry, as shown in fig. 1, the baffle 8 is provided with a first shearing opening 81, and the first shearing opening 81 is provided in plurality along the length direction of the baffle 8. Understandably, the number of the first shearing mouths 81 arranged on the baffle plate 8 can be controlled to regulate and control the shearing effect on the ore pulp, and the more the number of the first shearing mouths 81 is, the better the shearing effect on the ore pulp is.
As shown in fig. 1 and 5, a semicircular tubular disk turbine agitator 12 is disposed in the first strong mixing area 100, and the semicircular tubular disk turbine agitator 12 is disposed on the main shaft 7 and driven by the motor 2 to rotate. The diameter of the semicircular tubular disk turbine stirrer 12 is 1/3-2/3 of the diameter of the mixing barrel, and preferably, the diameter of the semicircular tubular disk turbine stirrer 12 is 1/3 of the diameter of the mixing barrel.
In this embodiment, the reverse tangential cyclone feeding and the mixing of the semicircular tubular disk turbine stirrer 12 are combined in the strong mixing area 100, so that the dispersion, collision and adhesion between mineral particles and reagents in the ore pulp are improved, the fine mud removal of the adhesion on the surface of the target mineral is facilitated, and the influence of the argillization phenomenon on the selectivity of the reagents is avoided.
As shown in fig. 1, 2 and 5, a shearing bar grating 9 and a semi-circular tubular disc turbine stirrer 12 are arranged in the two-stage strong shearing area 200, the shearing bar grating 9 is uniformly distributed in the two-stage strong shearing area 200 in an annular shape, and is fixed on an annular partition plate 10 through bolts, that is, the upper end and the lower end of the shearing bar grating 9 are respectively connected with two annular partition plates 10 arranged in the size mixing barrel. The number of the shearing bars 9 is generally 4-8, and preferably, 8 shearing bars 9 are arranged in the two-stage strong shearing area 200. It is noted that, as shown in fig. 3, the shearing bar 9 is located in front of the baffle plate 8, and is disposed in correspondence with the baffle plate 8.
Further, as shown in fig. 2, the cutting bar 9 includes a cutting plate 91, a second cutting opening 92 is provided on the cutting plate 91, the second cutting opening 92 is provided with a plurality of cutting teeth 93 along the length direction of the cutting plate 91, the two sides of the cutting plate 91 are provided with first cutting teeth 93, the first cutting teeth 93 on the two sides of the cutting plate 91 are triangular, the first cutting teeth 93 on the two sides of the cutting plate 91 are connected to form a saw-tooth shape, and the adjacent first cutting teeth 93 are bent in a staggered manner by using the cutting plate 91 as an interface, so as to form a saw-tooth-shaped blade rolling structure. The bending angle of the first cutting tooth 93 is between 30 ° and 60 °, preferably 50 °.
As shown in fig. 1 and 5, in the two-stage strong shearing area 200, a semi-circular tubular disc turbine agitator 12 is disposed on the main shaft 7 and is driven by the motor 2 to rotate. The diameter of the semicircular tubular disk turbine stirrer 12 is 1/3-2/3 of the diameter of the mixing barrel, and preferably, the diameter of the semicircular tubular disk turbine stirrer 12 is 1/3 of the diameter of the mixing barrel.
As shown in fig. 1, two serrated disc turbine cutters 13 are further arranged in the size mixing barrel, the two serrated disc turbine cutters 13 are respectively flush with the two annular partition plates 10, and a gap is reserved between the serrated disc turbine cutters 13 and the annular partition plates 10. The size of the gap is 1/20-1/15 of the diameter of the size mixing barrel, and preferably, the gap between the sawtooth disc turbine cutter 13 and the annular partition plate 10 is 1/20 of the size mixing barrel. The diameter of the serrated disc turbine cutter 13 is 1/3-2/3 between the size mixing barrels, and preferably, the diameter of the serrated disc turbine cutter 13 is 1/3 between the size mixing barrels.
As shown in fig. 6, the serrated disk turbo cutter 13 includes a disk body 131 and second cutting teeth 132, the second cutting teeth 132 are provided at the circumferential edge of the disk body 131, and adjacent second cutting teeth 132 are alternately curved with the disk body 131 as a boundary surface, i.e., one of the connected second cutting teeth 132 is curved toward the upper surface of the disk body 131 and the other is curved toward the lower surface of the disk body 131. The bending angle of the second cutting tooth 132 is between 15 deg. and 75 deg., preferably 45 deg..
It should be noted that the curved surface of the second shearing tooth 132 is an oblique curved surface, rather than a tangential curved surface with the disk main body 131, so that the second shearing tooth 132 can push the slurry to stir.
In order to enhance the shearing effect of the serrated disc turbo cutter 13, as shown in fig. 6, the serrated disc turbo cutter 13 is further provided with third shearing ports 133, and the third shearing ports 133 are annularly distributed around the center of the disc body 131. Preferably, the third shearing port 133 is a rectangular port, and the slab cut from the third shearing port 133 is welded vertically on the bottom surface of the disc main body 131 and on the opposite side of the third shearing port 133 from the direction of rotation of the serrated disc turbine cutter 13, so that the slurry passes through the third shearing port 133 under the blockage of the slab.
In this embodiment, the serrated disc turbine shears 13 and the shearing bar 9 are provided with shear openings, and the edges of the serrated disc turbine shears adopt serrated edge rolling structures which are alternately arranged, so that the shearing reinforcement of ore pulp in the radial direction and the axial direction can be realized, and the turbulence degree of the ore pulp is improved to the maximum extent.
In the embodiment, the combination of the shearing bar grating 9 and the serrated disc turbine shear 13 realizes the shearing reinforcement of the ore pulp in the radial direction and the axial direction, reduces the adverse effect of the fine-grained minerals on the fine mud stripping due to the streaming motion, and further enhances the dispersion, collision and adhesion of the target minerals and the medicament.
As shown in fig. 1 and 4, a reverse oblique blade disc turbine stirrer 6 is arranged in the three-stage strong conveying area 300, and the reverse oblique blade disc turbine stirrer 6 is arranged on the main shaft 7 and is driven by the motor 2 to rotate. The diameter of the reverse inclined blade disc turbine stirrer 6 is 1/3-2/3 between the pulping barrels, and preferably, the diameter of the reverse inclined blade disc turbine stirrer 6 is 1/3 between the pulping barrels.
In this embodiment, the three-stage powerful conveying area 300 combines the reverse inclined blade disc turbine agitator 6 with the cis-form tangential discharge, so that the pulp after size mixing is quickly discharged, the adverse effect of the over-size mixing on the subsequent flotation is favorably prevented, and a foundation is provided for the deep upgrading and utilization of low-quality mineral materials.
It should be noted that the feed pipe 15 is communicated with the dosing pipe 14, the discharge pipe 5, the pulp feed pipe 15 and the dosing pipe 14 are provided with a numerical control electromagnetic valve, and the discharge pipe 5, the pulp feed pipe 15 and the dosing pipe 14 are controlled to be opened and closed by the numerical control electromagnetic valve.
Example 2
The invention discloses a specific embodiment of a strong mixing and shearing method (hereinafter referred to as the "strong mixing and shearing method") suitable for fine mineral flotation, which adopts the strong mixing and shearing device of embodiment 1 and comprises the following steps:
step S1: the accident discharging pipe 11 is closed and the motor 2 is started.
Before stirring and size mixing are started, the accident discharging pipe 11 is closed in advance through a numerical control electromagnetic valve, and then the motor 2 is started; the motor 2 drives the reverse inclined blade disc turbine stirrer 6, the semi-circular tube type disc turbine stirrer 12 and the sawtooth disc turbine cutter 13 on the main shaft 7 to rotate through the power transmission mechanism 1.
Step S2: after the operation of the size mixing barrel is stable, the ore pulp discharging pipe 5, the ore pulp feeding pipe 15 and the chemical adding pipe 14 are opened in sequence through the numerical control electromagnetic valve. The ore pulp enters a section of strong mixing area 100 at the bottom of the size mixing barrel through an ore pulp feeding pipe 15 along the tangential direction to form rotational flow, and forms counter-current collision with a rotating semi-circular tubular disc turbine stirrer 12. The ore pulp forms negative pressure when passing through the dosing pipe 14, and the collecting agent and the foaming agent in the dosing pipe 14 enter the ore pulp by self-absorption under the action of pressure and are suspended and dispersed by the semicircular tubular disc turbine stirrer 12 rotating at high speed.
Wherein the collecting agent is selected from kerosene, diesel oil or pine oil, preferably diesel oil; the dosage is 0.5-4 kg/t, preferably 0.5 kg/t; the foaming agent is sec-octanol, methyl isobutyl carbinol, methyl amyl alcohol or dodecyl trimethyl ammonium bromide, preferably sec-octanol; the amount is 0.2-2 kg/t, preferably 0.2 kg/t.
One section powerful mixing zone 100 adopts the structural design of reverse tangential whirl pan feeding and semicircle tubular disc turbine agitator 12, has improved the suspension dispersion, collision and the adhesion of mineral particle and medicament in the ore pulp, helps the fine particle of purpose mineral surface adhesion to peel off, has avoided the influence of argillization phenomenon to medicament selectivity, has realized the abundant contact of ore pulp and medicament, is the basic link of handling the difficult size mixing mineral particle of low-quality.
Step S3: the ore pulp in the first strong mixing zone 100 enters the second strong shearing zone 200 through the annular partition plate 10 and the serrated disc turbine cutter 13 on the lower layer of the size mixing barrel, and an annular shearing opening (formed by enclosing a third shearing opening 133) formed in the surface of the serrated disc turbine cutter 13 and serrated rolling edges (formed by alternately bending second shearing teeth 132) with the edges alternating up and down form a strong shearing action on the passing ore pulp.
Step S4: the slurry in the two-stage strong shearing zone 200 is further sheared and strengthened by the shearing bar 9 between the two annular partition plates 10, the second shearing opening 91 and the serrated edge (formed by the first shearing teeth 93) on the surface of the shearing bar 9 under the stirring of the semi-circular tube type disc turbine stirrer 12. Meanwhile, the vertical baffle 8 at the barrel wall of the size mixing barrel also forms a barrier to the rotating ore pulp, and is beneficial to improving the turbulence degree of the ore pulp. The pulp after enhanced shearing and pulp mixing enters a three-section powerful conveying area 300 through an upper annular partition plate 10 and a sawtooth disc turbine cutter 13.
The combined design of the shearing bar grating 9 and the sawtooth disc turbine shears 13 in the two-section strong shearing area 200 realizes the shearing strengthening of the ore pulp in the radial direction and the axial direction, reduces the adverse effect of the streaming motion of fine-grained minerals on the peeling of fine mud, further enhances the dispersion, collision and adhesion between mineral particles and medicaments, and is a key link for processing low-quality mineral particles difficult to pulp.
Step S5: the ore pulp entering the three-section powerful conveying area 300 is driven by the reverse inclined blade disc turbine stirrer 6 to be discharged in a cis form along the tangential discharge pipe 5, so that the rapid treatment of the pulp mixing is realized, the adverse effect of excessive pulp mixing on subsequent flotation is prevented, and the method is a final link for treating low-quality mineral particles difficult to mix.
It should be noted that the control of the pulp shearing action can also be achieved by changing the number of baffles 8 and shearing bars 9 according to the feeding properties and the on-site production needs. When the mineral particles are complex in nature and high in fine mud content (difficult to float), the number of the baffle plates 8 and the shearing bar grids 9 can be increased, and the shearing and pulp mixing effect is enhanced; when the mineral particles are uniform in property and low in content of fine mud (easy to float), the number of the vertical baffle plates 8 and the number of the shearing bars 9 can be reduced, the throughput of ore pulp is improved, and the processing capacity of equipment is increased. When equipment breaks down or overhauls, accessible accident row material pipe 11 emits the ore pulp in the size mixing bucket and overhauls the operation, and the structural design also is favorable to the adjustment of key part and changes the maintenance simultaneously, has improved the life of equipment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the 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.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111403460.5A CN114713382B (en) | 2021-11-19 | 2021-11-19 | Strong mixing and shearing device and method suitable for fine mineral flotation |
| PCT/CN2022/131073 WO2023088162A1 (en) | 2021-11-19 | 2022-11-10 | Powerful mixing and shearing device and method suitable for fine-particle flotation of minerals |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111403460.5A CN114713382B (en) | 2021-11-19 | 2021-11-19 | Strong mixing and shearing device and method suitable for fine mineral flotation |
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| CN114713382A true CN114713382A (en) | 2022-07-08 |
| CN114713382B CN114713382B (en) | 2023-03-14 |
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| WO (1) | WO2023088162A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023088162A1 (en) * | 2021-11-19 | 2023-05-25 | 中国矿业大学 | Powerful mixing and shearing device and method suitable for fine-particle flotation of minerals |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117018942B (en) * | 2023-10-09 | 2023-12-26 | 烟台鑫海矿业研究设计有限公司 | Full-automatic quantitative mixing equipment of flotation reagent |
| CN118142408B (en) * | 2024-05-13 | 2024-07-05 | 洛阳昶威机械制造安装有限公司 | Stirring tank, stirring method and application of stirring tank and stirring method in field of mineral flotation |
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| WO2023088162A1 (en) | 2023-05-25 |
| CN114713382B (en) | 2023-03-14 |
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