CN113145239B - Superfine mill - Google Patents

Superfine mill Download PDF

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Publication number
CN113145239B
CN113145239B CN202110371687.XA CN202110371687A CN113145239B CN 113145239 B CN113145239 B CN 113145239B CN 202110371687 A CN202110371687 A CN 202110371687A CN 113145239 B CN113145239 B CN 113145239B
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grinding
cavity
coarse
ore
fine
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CN113145239A (en
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张伟晓
张济文
闾绢沙
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Lingbao Lingjin Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/1805—Monitoring devices for tumbling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/1825—Lifting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/20—Disintegrating members
    • B02C17/205—Adding disintegrating members to the tumbling mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

An ultrafine grinding machine comprises an ore feeding cavity I, a coarse grinding cavity II, a fine grinding cavity III and a grading cavity IV which are distributed in a cylinder body from bottom to top, wherein the ore grinding linear speed of the coarse grinding cavity II is smaller than that of the fine grinding cavity III, the ore grinding medium granularity of the coarse grinding cavity II is larger than that of the fine grinding cavity III, the grading cavity IV is a conical expansion section, grading is carried out by utilizing different sedimentation end speeds of coarse and fine particles, the coarse particles are settled and returned to the ore grinding, and the fine particles flow out as a product. The stirring blade adopts a disc type structure with a lifting block, on one hand, the grinding medium is lifted to be prevented from depositing, on the other hand, the grinding medium is enabled to realize high-speed rotation, and the grinding blade collides with mineral particles to generate a grinding and stripping effect. The stirring system adopts the bearing to fix the upper end and the lower end of the mill, thereby avoiding the vibration caused by high-speed rotation. By the measures, the manufacturing difficulty and equipment investment are reduced, the high-efficiency grinding of minerals is realized, the product granularity can reach 1-2 microns, and a foundation is laid for further high-efficiency treatment of refractory minerals.

Description

Superfine mill
Technical Field
The invention belongs to the technical field of mills in metallurgical mining, and particularly relates to an ultra-fine mill.
Background
Along with the gradual depletion of the resources of the easily-selected and metallurgical ores, the difficultly-selected and metallurgical ores become the main source of mineral processing. Refractory ore usually exists in micron-scale micro-fine particle form due to fine embedded particle size of target mineral, and monomer dissociation must be realized by ore grinding, which requires the realization of micron-scale ultra-fine mills. The power consumption and the steel ball consumption of the traditional crushing and grinding process are very high, so that the ore grinding cost is high, and the mine production of a plurality of refractory ores cannot be operated economically. The fineness of the product of the prior common mill is about 74 microns, the fineness of the product of the spiral stirring mill is about 37 microns, and the requirement of dissociation of refractory mineral monomers is difficult to achieve. The Issatay Mill from Netzsch, Germany, achieved a product fineness of 2 microns. The Isa mill is a horizontal high-speed stirring mill, has high processing precision requirement, complex structure and higher manufacturing cost, and is also a main reason for restricting the application of the Isa mill.
The prior art is specifically described as follows:
1. ball mill:
the ball mill is generally horizontal, the cylinder rotates, the cylinder is filled with grinding media, generally steel balls, minerals are fed from a central cylinder at one end of the cylinder, the central cylinder at the other end of the cylinder is discharged, the rotating speed is low, and the ball mill is structurally shown in figure 1 and mainly comprises a motor I101, a speed reducer I102, a gear I103, a discharge opening I104, a bearing I105, a cylinder I106, a bearing I107, a feed opening I108 and the like.
The fineness of a common grinding product is 0.1-0.2 mm, the two sections are connected in series, the product can reach 0.074-0.1 mm after closed classification, and the common grinding product is usually used for coarse grinding.
2. Vertical stirring mill:
the vertical mill generally adopts a screw as a stirring device, an ore grinding medium, generally a steel ball, is filled in a cylinder body, minerals are fed from the lower part of the cylinder body, the screw drives the minerals and the ore grinding medium to rotate at a low speed in the cylinder body, the minerals are ground by depending on the friction action between the minerals and the ore grinding medium, and the minerals are finally discharged from the upper part of the cylinder body. The structure of the device is shown in fig. 2, and the device mainly comprises a second motor 201, a second speed reducer 202, a second bearing 203, a second discharge outlet 204, a second ball adding port 205, a second stirring system 206, a second cylinder 207 and a second feed inlet 208.
The spiral rotating speed of the vertical mill is low, the linear speed of the outer edge of the spiral is generally 1-3m/s, the granularity of a ground ore product is usually 0.037-0.074 mm, and the granularity of the product can reach 0.037mm after classification.
When in fine grinding, the unit power consumption of the vertical grinder is lower than that of a common grinder, but the product granularity cannot reach 0.01mm, namely below 10 mu m, due to the limitation of the structure parameters of the equipment, and no example appears in field production.
3. An Issatchen:
the Issatay mill from Netzsch, Germany, is a horizontal high-speed stirring mill, which is modified from the stirring mill used in the pigment industry.
The structure of the device is shown in figure 3, and the device mainly comprises a motor III 301, a speed reducer III 302, a bearing III 303, a grinding disc III 304, a feeding pipe III 305, a rotor III 306 and a mill ore discharge pipe III 307, wherein an arrow A in the figure indicates the moving direction of a shell during maintenance.
The grinding machine mainly comprises 8 grinding discs III 304, wherein the grinding discs III 304 are arranged on a shaft and are driven to rotate together by a motor III 301 and a gearbox. The linear speed of the tail ends of the three 304 grinding disks is 21-23 m/s during operation, and 8 grinding chambers are substantially separated between the two three 304 grinding disks. The grinding medium is accelerated to move towards the shell along the radial direction by the driving of the three 304, the medium between the two three 304 forms circulation in each chamber of the three 304 due to different radial acceleration along the disc surface, and the ore is ground under the stirring of the medium.
As the linear speed of the tail end of the grinding disc is 21-23 m/s during operation and the grinding mill is provided with a plurality of grinding chambers, a short circuit cannot be formed from the feeding position to the discharging position of the grinding mill. Because of the multiple grinding chambers and high energy intensity, the chance of collision between the medium and the mineral particles is greatly increased, so that the superfine grinding can be realized in a true sense. In the production example, 90% of the product can be less than 5 μm.
However, the Issato mill has a single cantilever structure, the structure is complex, and the requirements on concentricity and machining precision of a running part are high, so that the processing difficulty is high, the manufacturing cost is high, and the application of the Issato mill is limited to a certain extent.
Meanwhile, the structure limits the possibility of adopting grinding media with different diameters, and sectional grinding in the machine is difficult to realize, so that the requirement on the size fraction of ore feeding is higher, and the adaptation surface is narrower.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an ultrafine grinding machine, which can realize ultrafine grinding at the micron level, greatly simplifies the mechanical structure, has wide grain size of the mineral to be ground and good adaptability, can realize self-classification of the product in the grinding machine, has narrow grain size distribution, and can grind the mineral in an open circuit.
In order to achieve the purpose, the invention adopts the technical scheme that:
an ultra-fine grinding machine comprises an ore feeding cavity I, a coarse grinding cavity II, a fine grinding cavity III and a grading cavity IV which are distributed in a cylinder body 8 from bottom to top, wherein the ore grinding linear speed of the coarse grinding cavity II is smaller than that of the fine grinding cavity III, the ore grinding medium granularity of the coarse grinding cavity II is larger than that of the fine grinding cavity III, the grading cavity IV is a conical expansion section, grading is carried out by utilizing different settling end speeds of coarse and fine particles, the coarse particles are settled and returned to the ore grinding, and the fine particles flow out as a product.
Furthermore, the feeding cavity I and the rough grinding cavity II are separated by a sieve plate 17 through which materials can pass but coarse grinding media cannot pass, the rough grinding cavity II and the fine grinding cavity III are separated by a partition plate 14 through which materials can pass but fine grinding media cannot pass, the fine grinding cavity III and the grading cavity IV are separated by a fixed disc 5 through which settled return materials can pass, and the feeding cavity I, the rough grinding cavity II, the fine grinding cavity III and the grading cavity IV share one stirring main shaft 3.
Furthermore, the partition plate 14 is provided with a central hole for the stirring main shaft 3 to pass through, a gap for materials to pass through is formed between the central hole and the stirring main shaft 3, and the outer edge of the partition plate 14 is connected with the inner wall of the cylinder 8; the fixed disk 5 is provided with a central hole for the stirring main shaft 3 to pass through, and a gap for materials to pass through is formed between the outer edge of the fixed disk 5 and the inner wall of the cylinder 8.
Furthermore, a shaft outer sleeve 6 is fixed on the stirring main shaft 3, the outer diameter of the shaft outer sleeve 6 is 1/5-4/5 of the diameter of the cylinder 8, and the outer diameter of the shaft outer sleeve 6 located in the rough grinding cavity II is smaller than that of the shaft outer sleeve 6 located in the fine grinding cavity III.
Furthermore, the inner diameter of the central hole of the partition plate 14 is 0.1-10 mm larger than the diameter of the stirring main shaft 3 or the shaft outer sleeve 6, and the mesh opening diameter of the sieve plate 17 is 1/3-95/100 of the diameter of the coarse grinding medium.
Further, the stirring main shaft 3 is installed with a lower bearing 11 at the bottom through an upper bearing 2 at the upper part of the cylinder 8, the lower end of the stirring main shaft 3 is conical and forms a detachable tight fit with a lower transmission assembly 10 which is fixed at the bottom end cover of the cylinder 8 and is in an inner conical shape, and a mechanical seal is adopted between the lower transmission assembly 10 and the bottom end cover to avoid slurry leakage.
Further, a lower blade 9 is fixed in the rough grinding cavity II on the stirring main shaft 3, an upper blade 7 is fixed in the fine grinding cavity III, the lower blade 9 and the upper blade 7 are both of a disc type structure, a through hole 18 is formed in the disc surface, and the outer diameter of the lower blade 9 is smaller than that of the upper blade 7.
Furthermore, the lower blade 9 and the upper blade 7 are both provided with a lifting block 20, the upper surface of the lifting block 20 inclines upwards, and the included angle between the upper surface of the lifting block and the horizontal plane is 0.5-45 degrees.
Furthermore, the ore grinding linear speed of the coarse grinding cavity II is 5-20 m/s, the ore grinding linear speed of the fine grinding cavity III is 10-50 m/s, the ore grinding medium granularity of the coarse grinding cavity II is 3-8 mm, and the ore grinding medium granularity of the fine grinding cavity III is 1-3 mm.
Furthermore, the feeding cavity I is connected with a feeding pipe 16, the upper parts of the rough grinding cavity II and the fine grinding cavity III are connected with a ball adding port 13, and the upper part of the grading cavity IV is provided with a mine discharging port 4.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention realizes the step-by-step ore grinding by adopting a plurality of chambers distributed from bottom to top, and both the mechanical structure and the control process are greatly simplified.
2. The invention overcomes the problems of poor fine grinding effect of large-diameter grinding media and poor coarse grain effect of small-diameter grinding media through the first-stage coarse grinding and the second-stage fine grinding, and can realize wide-grade ore feeding.
3. The invention adopts the disk with the inclined plane lifting block, so that the grinding machine realizes higher linear speed and energy intensity of the impeller to improve the superfine grinding capacity, and the manufacturing difficulty and equipment investment of the grinding machine are reduced.
4. The invention can reduce the maintenance workload of the equipment and greatly improve the operation rate, thereby greatly reducing the operation cost of the superfine grinding technology.
Drawings
Fig. 1 is a schematic diagram of a ball mill according to the prior art.
FIG. 2 is a schematic diagram of a prior art tower mill configuration.
Fig. 3 is a schematic diagram of an isamill structure in the prior art.
Fig. 4 is a schematic structural diagram of the present invention.
FIG. 5 is a schematic view of the lower drive assembly of the present invention.
FIG. 6 is a schematic view (from above) of the blade configuration of the present invention.
Fig. 7 is a schematic view of the blade structure of the present invention (central cross-sectional view).
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
As shown in FIG. 4, the present invention is an ultrafine grinding machine, the main body of which is a cylindrical body 8, and a holder 12 is welded to the outside of the cylindrical body 8 to support the whole apparatus. Four cavities, namely an ore feeding cavity I, a coarse grinding cavity II, a fine grinding cavity III and a grading cavity IV are distributed in the cylinder body 8 from bottom to top, the four cavities share one stirring main shaft 3, the stirring main shaft 3 penetrates through the ore feeding cavity I, the coarse grinding cavity II, the fine grinding cavity III and the grading cavity IV, the ore feeding cavity I is connected with an ore feeding pipe 16, the upper parts of the coarse grinding cavity II and the fine grinding cavity III are connected with a ball adding port 13, the upper part of the grading cavity IV is provided with an ore discharge port 4, certain ore grinding media (such as zirconium beads, ceramic beads or glass beads) are filled in the coarse grinding cavity II and the fine grinding cavity III, the ore grinding medium granularity of the coarse grinding cavity II is 3-8 mm, and the ore grinding medium granularity of the fine grinding cavity III is 1-3 mm.
The high-speed rotation of the stirring main shaft 3 can forcibly drive the medium balls and the materials to do multidimensional circulating rotary motion in the cylinder 8, and the mineral particles are effectively ground through friction and impact collision under the weight pressure and the extrusion force of the grinding medium. And finally, the coarse particles enter a grading cavity IV from a fine grinding cavity III, the coarse particles are settled in the grading cavity IV and return to fine grinding, and the fine particles are discharged from an ore discharge port 4 at the upper part.
In order to realize higher raw material adaptability, a sectional ore grinding mode is adopted, namely, one-section coarse grinding is carried out in the coarse grinding cavity II, the ore grinding linear speed is lower, and the ore grinding medium with larger granularity is adopted to realize the pre-grinding of coarser particles in the ore feeding. The fine grinding cavity III is a two-stage grinding cavity, the ore feeding granularity is reduced, the ore feeding granularity and the fine particles in the ore feeding enter the fine grinding cavity III, the ore grinding linear speed of the fine grinding cavity III is high (higher than that of the coarse grinding cavity II), and the ore grinding medium with smaller granularity (smaller than that of the coarse grinding cavity II) is adopted to realize superfine grinding, so that the problems of poor fine grinding effect of the large-diameter ore grinding medium and poor coarse grain effect of the small-diameter ore grinding medium are solved, and wide-grade ore feeding is realized.
And the grading cavity IV is positioned at the uppermost part and has a conical expansion section structure, and grading is performed by utilizing different settling terminal speeds of coarse and fine particles, so that coarse particles in the product are settled and returned to grinding, and fine particles flow out as the product, thereby realizing self-grading.
In the invention, the feeding cavity I and the rough grinding cavity II are separated by the sieve plate 17 through which materials can pass but rough grinding media cannot pass, generally, the aperture of the sieve plate 17 is 1/3-95/100 of the diameter of the rough grinding media, so that the leaked grinding media are prevented from entering the feeding cavity I and damaging the mechanical seal between the stirring main shaft 3 and the bottom of the cylinder 8.
The coarse grinding cavity II and the fine grinding cavity III are separated by a partition plate 14 through which materials can pass but fine grinding media cannot pass, the partition plate 14 is provided with a central hole through which the stirring main shaft 3 can pass, a gap between the central hole and the stirring main shaft 3 can be used for the materials to pass, and the outer edge of the partition plate 14 is in seamless connection with the inner wall of the cylinder 8. A wear-resistant sleeve can be additionally arranged between the stirring main shaft 3 and the partition plate 14 to protect the stirring main shaft 3, and the ore pulp flows through a gap between the stirring blade and the partition plate 14, wherein the gap is smaller than 1/2 of the diameter of the grinding medium, so that the grinding medium is prevented from leaking from the fine grinding cavity to the coarse grinding cavity. Generally, the inner diameter of the central hole of the baffle plate 14 is 0.1-10 mm larger than the diameter of the stirring main shaft 3 or the shaft outer sleeve 6. The screen plate 17 and the partition plate 14 play a role in preventing ore grinding media from leaking down and preventing the ore grinding media from entering other chambers.
The fine grinding cavity III and the grading cavity IV are separated by a fixed disk 5 through which settled return materials can pass, the fixed disk 5 is also provided with a central hole through which the stirring main shaft 3 passes, but the gap between the central hole and the stirring main shaft 3 is negligible, and the materials can pass through the gap between the outer edge of the fixed disk 5 and the inner wall of the cylinder 8.
The stirring system comprises a motor reducer 1, a stirring main shaft 3 and stirring blades, wherein the stirring main shaft 3 is arranged through an upper bearing 2 at the upper part and a lower bearing 11 at the bottom of a cylinder 8, so that the stability of a rotating part is improved, the vibration generated by high-speed rotation is reduced, and the processing difficulty is reduced. Referring to fig. 5, the lower bearing 11 is installed in a bearing seat 25, the spindle head 22 at the lower end of the mixing spindle 3 is designed to be conical, and forms a detachable tight fit with the lower transmission assembly 10 which is fixed on the bottom end cover 24 of the cylinder 8 and is in an inner conical shape, and a mechanical seal fixing disc 23 and a shaft seal 15 are adopted between the lower transmission assembly 10 and the bottom end cover 24 for mechanical sealing so as to avoid slurry leakage.
The shaft outer sleeve 6 is fixed on the stirring main shaft 3, generally, the outer diameter of the shaft outer sleeve 6 is 1/5-4/5 of the diameter of the cylinder 8, but the outer diameter of the shaft outer sleeve 6 positioned in the rough grinding cavity II is generally smaller than that of the shaft outer sleeve 6 positioned in the fine grinding cavity III.
The stirring blade comprises a lower blade 9 positioned in the rough grinding cavity II and an upper blade 7 positioned in the fine grinding cavity III, the lower blade 9 and the upper blade 7 are both fixed on the stirring main shaft 3, and the outer diameter of the lower blade 9 is generally smaller than that of the upper blade 7.
The lower blade 9 and the upper blade 7 are both discs with inclined lifting blocks, that is, both are disc-type structures, referring to fig. 6 and 7, the main body of the main body is a blade disc 19, a plurality of through holes 18 are opened on the disc surface of the blade disc 19, a plurality of lifting blocks 20 are installed, and a plurality of installation screw holes 21 are reserved. The upper surface of each lifting block 20 inclines upwards (can incline along the circumferential direction or along the tangential direction), and the included angle between the upper surface of each lifting block and the horizontal plane is 0.5-45 degrees, so that ore grinding media can be prevented from settling to the bottom of the ore grinding chamber, and ore pulp and the ore grinding media are dispersed upwards.
In the present invention, the lifting blocks 20 and the through holes 18 can be uniformly distributed at intervals, and the lifting blocks 20 can be designed to be detachable and replaceable.
By the stirring system structure, slurry can be forced to pass through a high linear velocity region between the shaft outer sleeve 6 and the cylinder body 8, so that the slurry is prevented from passing through a low linear velocity region of the shaft part, and the ore grinding efficiency is improved; and can lift the ore grinding medium from deposition; the grinding medium can also realize high-speed rotation and generate grinding and stripping effects by colliding with mineral particles.
By the measures, the manufacturing difficulty and equipment investment are reduced, the high-efficiency grinding of minerals is realized, the product granularity can reach 1-2 microns, and a foundation is laid for further high-efficiency treatment of refractory minerals.
In order to improve the energy intensity, the linear velocity of the outer end of each blade is 5-50 m/s, specifically, the linear velocity of the outer end of each underground blade 9, namely the linear velocity of ore grinding in the rough grinding cavity II, is 5-20 m/s, and the linear velocity of the outer end of each upper blade 7, namely the linear velocity of ore grinding in the fine grinding cavity III, is 10-50 m/s.
The specific working process of the invention is as follows:
referring to the attached figure 1, the prepared ore pulp enters an ore feeding cavity I from an ore feeding pipe 16, passes through a sieve plate 17, enters a coarse grinding cavity II, is stirred by a lower blade 9 for coarse grinding, coarse particles in the material are ground, pass through a gap between the lower blade 9 and an interlayer partition plate 14 together with fine particles in the material, enter a fine grinding cavity III, are stirred by an upper blade 7, collide with fine balls in the fine grinding cavity III for grinding and stripping, and are subjected to fine grinding. The finely ground materials enter the classification chamber IV through a gap between the fixed disk 5 and the cylinder 8, the materials are classified, fine-grained materials overflow from the upper part and enter the ore discharge port 4, and coarse grains return to the fine grinding chamber III.
To verify the effect of the present invention, the following specific processing examples are provided:
example 1
Gold concentrate of a certain mine in Gansu is treated, the granularity D90 (the granularity when the sieving rate is 90 percent by mass) of the gold concentrate is determined to be 85 mu m by a BT9300HT type laser granularity analyzer, and the detailed granularity composition is shown in the following table:
Figure BDA0003009537630000081
the gold concentrate is treated by the method, compared with a TW20 type spiral stirring mill with the same installed power as the method, and the fineness measurement is carried out by using a BT9300HT type laser particle size analyzer. And the power consumption calculation adopts a frequency converter to display real-time power. The specific conditions are as follows:
step 1, grinding: adding water into 3t of raw materials to prepare ore pulp with the solid-liquid mass ratio of 1: 1.5; steps 2, 3, 4, 1.85m each3(Dry ore amount 1t)
Step 2, adopting the superfine mill of the invention, the ore feeding amount is 0.15m3The power is measured in a speed/h (0.081t/h), the motor frequency is 45HZ, open circuit grinding is carried out for 5 hours, and the fineness is analyzed by sampling every hour.
Step 3, adopting the superfine mill of the invention, the ore feeding amount is 0.6m3The fineness was analyzed by sampling every 30 minutes for 3 hours at a motor frequency of 50HZ and open circuit grinding (0.33 t/h).
Step 4, adopting a certain spiral stirring mill TW20, and feeding ore quantity of 0.6m30.33t/h, motor frequency 50HZ, open circuit grinding for 3 hours, every 30 hoursMinute samples were taken for analysis of fineness.
The two devices are compared as follows:
Figure BDA0003009537630000082
the experimental result proves that the superfine mill of the invention is greatly superior to the existing common fine mill in the ore grinding effect, the unit power consumption is greatly reduced compared with that of the existing common fine mill, and the power consumption is basically equivalent to that of an Isa mill under the same fineness.
Example 2
The roasted slag of a certain smelting plant in Henan is treated, the granularity D90 of the roasted slag is determined to be 58.8 mu m by a BT9300HT type laser granularity analyzer, and the composition is shown in the following table:
Figure BDA0003009537630000091
the gold concentrate is treated by the method, compared with a TW20 type spiral stirring mill with the same installed power as the method, and the fineness measurement is carried out by using a BT9300HT type laser particle size analyzer. The specific conditions are as follows:
step 1, grinding: adding water into 1.5t of raw materials to prepare ore pulp with the solid-liquid mass ratio of 1: 1.5; step 2, 3, 4 each 0.91m3(Dry ore quantity 0.5t)
Step 2, adopting the superfine mill of the invention, the ore feeding amount is 0.15m3The power is measured in a speed/h (0.082t/h), the motor frequency is 45HZ, the ore is ground for 5 hours in an open circuit way, and the fineness is analyzed by sampling every hour.
Step 3, adopting the superfine mill of the invention, the ore feeding amount is 0.3m3The fineness is analyzed by sampling every 30 minutes, wherein the frequency of the motor is 50HZ, the ore is ground for 2 hours in an open circuit mode (0.16 t/h).
Step 4, adopting a certain spiral stirring mill TW20, and feeding ore quantity of 0.3m3The fineness is analyzed by sampling every 30 minutes, wherein the frequency of the motor is 50HZ, the ore is ground for 2 hours in an open circuit mode (0.16 t/h).
The two devices are compared as follows:
Figure BDA0003009537630000092
the experimental result proves that the superfine mill of the invention is greatly superior to the existing common fine mill in the ore grinding effect, the unit power consumption is greatly reduced compared with that of the existing common fine mill, and the power consumption is basically equivalent to that of an Isa mill under the same fineness.

Claims (3)

1. An ultrafine grinding machine is characterized by comprising an ore feeding cavity I, a coarse grinding cavity II, a fine grinding cavity III and a grading cavity IV which are distributed in a cylinder body (8) from bottom to top, wherein the ore grinding linear speed of the coarse grinding cavity II is smaller than that of the fine grinding cavity III, the ore grinding medium granularity of the coarse grinding cavity II is larger than that of the fine grinding cavity III, the grading cavity IV is a conical expansion section, grading is carried out by utilizing different settling end speeds of coarse and fine particles, the coarse particles are settled and returned to grinding, and the fine particles flow out as a product;
the feeding cavity I and the rough grinding cavity II are separated by a sieve plate (17) through which materials can pass but coarse grinding media cannot pass, the rough grinding cavity II and the fine grinding cavity III are separated by a partition plate (14) through which materials can pass but fine grinding media cannot pass, the fine grinding cavity III and the grading cavity IV are separated by a fixed disc (5) through which settled return materials can pass, and the feeding cavity I, the rough grinding cavity II, the fine grinding cavity III and the grading cavity IV share one stirring main shaft (3);
the partition plate (14) is provided with a central hole for the stirring main shaft (3) to pass through, a gap for materials to pass through is formed between the central hole and the stirring main shaft (3), and the outer edge of the partition plate (14) is connected with the inner wall of the cylinder body (8); the fixed disk (5) is provided with a central hole for the stirring main shaft (3) to pass through, and a gap for materials to pass through is formed between the outer edge of the fixed disk (5) and the inner wall of the cylinder body (8);
a shaft outer sleeve (6) is fixed on the stirring main shaft (3), the outer diameter of the shaft outer sleeve (6) is 1/5-4/5 of the diameter of the cylinder body (8), and the outer diameter of the shaft outer sleeve (6) positioned in the coarse grinding cavity II is smaller than that of the shaft outer sleeve (6) positioned in the fine grinding cavity III;
the inner diameter of a central hole of the partition plate (14) is 0.1-10 mm larger than the diameter of the shaft outer sleeve (6), and the aperture of a sieve pore of the sieve plate (17) is 1/3-95/100 of the diameter of a coarse grinding medium;
a lower blade (9) is fixed in the rough grinding cavity II on the stirring main shaft (3), an upper blade (7) is fixed in the fine grinding cavity III, the lower blade (9) and the upper blade (7) are both of a disc type structure, a through hole (18) is formed in the disc surface, and the outer diameter of the lower blade (9) is smaller than that of the upper blade (7);
lifting blocks (20) are arranged on the lower blade (9) and the upper blade (7), the upper surfaces of the lifting blocks (20) are inclined upwards, and the included angle between the upper surfaces of the lifting blocks and the horizontal plane is 0.5-45 degrees;
the ore grinding linear speed of the coarse grinding cavity II is 5-20 m/s, the ore grinding linear speed of the fine grinding cavity III is 10-50 m/s, the ore grinding medium granularity of the coarse grinding cavity II is 3-8 mm, and the ore grinding medium granularity of the fine grinding cavity III is 1-3 mm.
2. The superfine mill according to claim 1, wherein the stirring main shaft (3) is installed with a lower bearing (11) at the bottom through an upper bearing (2) at the upper part of the cylinder (8), the lower end of the stirring main shaft (3) is conical, and forms a detachable tight fit with a lower transmission assembly (10) which is fixed at the bottom end cover of the cylinder (8) and is in an inner conical shape, and a mechanical seal is adopted between the lower transmission assembly (10) and the bottom end cover to avoid slurry leakage.
3. The superfine mill according to claim 1, wherein the feeding chamber I is connected with a feeding pipe (16), the upper parts of the coarse grinding chamber II and the fine grinding chamber III are connected with a ball adding port (13), and the upper part of the grading chamber IV is provided with a discharge port (4).
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CN116851099B (en) * 2023-07-11 2023-12-08 浙江艾领创矿业科技有限公司 Small-size ring dislocation distribution's stirring structure and contain its sand mill

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CN105327743A (en) * 2015-10-28 2016-02-17 中国矿业大学 Multi-chamber vertical stirring mill
CN106902931A (en) * 2017-03-16 2017-06-30 耿志杰 A kind of tower vertical mill of two-chamber
CN107127045A (en) * 2017-06-26 2017-09-05 北矿机电科技有限责任公司 From grading plant inside a kind of vertical screw agitating mill
CN209680250U (en) * 2019-03-11 2019-11-26 浦江海威斯新材料科技有限公司 Vertical grinding machine is used in a kind of production of slurry
CN111054488A (en) * 2019-12-14 2020-04-24 安徽儒特实业有限公司 Vertical sand mill
CN111992302A (en) * 2020-08-04 2020-11-27 中冶北方（大连）工程技术有限公司 Two-section ore grinding device

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Publication number Priority date Publication date Assignee Title
CN2267858Y (en) * 1996-07-15 1997-11-19 冶金工业部秦皇岛冶金设计研究院 high-efficiency stirring tower type mill
CN200957373Y (en) * 2006-02-08 2007-10-10 泊头市远大磨料设备厂 Abrasive producer
CN102059167A (en) * 2010-11-25 2011-05-18 长沙矿冶研究院 Mining micron-sized superfine stirring ore mill
CN202460760U (en) * 2012-02-17 2012-10-03 成都大宏立机器制造有限公司 Spindle fixing structure for vertical multistage crusher
CN105327743A (en) * 2015-10-28 2016-02-17 中国矿业大学 Multi-chamber vertical stirring mill
CN106902931A (en) * 2017-03-16 2017-06-30 耿志杰 A kind of tower vertical mill of two-chamber
CN107127045A (en) * 2017-06-26 2017-09-05 北矿机电科技有限责任公司 From grading plant inside a kind of vertical screw agitating mill
CN209680250U (en) * 2019-03-11 2019-11-26 浦江海威斯新材料科技有限公司 Vertical grinding machine is used in a kind of production of slurry
CN111054488A (en) * 2019-12-14 2020-04-24 安徽儒特实业有限公司 Vertical sand mill
CN111992302A (en) * 2020-08-04 2020-11-27 中冶北方（大连）工程技术有限公司 Two-section ore grinding device

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Patentee before: Zhang Weixiao