CN111570064B - 2mm fine fraction dry powder preparation system and powder preparation process thereof - Google Patents
2mm fine fraction dry powder preparation system and powder preparation process thereof Download PDFInfo
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- CN111570064B CN111570064B CN202010472402.7A CN202010472402A CN111570064B CN 111570064 B CN111570064 B CN 111570064B CN 202010472402 A CN202010472402 A CN 202010472402A CN 111570064 B CN111570064 B CN 111570064B
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- conveying belt
- pressure roller
- roller mill
- fine fraction
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- 239000000843 powder Substances 0.000 title claims abstract description 59
- 238000002360 preparation method Methods 0.000 title description 9
- 230000003068 static effect Effects 0.000 claims abstract description 39
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 37
- 239000011707 mineral Substances 0.000 claims abstract description 37
- 239000000428 dust Substances 0.000 claims abstract description 26
- 238000007599 discharging Methods 0.000 claims abstract description 19
- 239000004576 sand Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 32
- 238000003860 storage Methods 0.000 claims description 9
- 238000009837 dry grinding Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000010298 pulverizing process Methods 0.000 abstract description 12
- 238000000926 separation method Methods 0.000 abstract description 11
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000001035 drying Methods 0.000 abstract 1
- 238000005065 mining Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000010419 fine particle Substances 0.000 description 7
- 238000012216 screening Methods 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 239000011362 coarse particle Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
- B02C21/002—Disintegrating plant with or without drying of the material using a combination of a roller mill and a drum mill
- B02C21/005—Disintegrating plant with or without drying of the material using a combination of a roller mill and a drum mill the roller mill having cooperating rollers
-
- 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
-
- 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
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/20—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating
- B02C23/22—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating with recirculation of material to crushing or disintegrating zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/42—Driving mechanisms; Roller speed control
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Disintegrating Or Milling (AREA)
- Crushing And Grinding (AREA)
Abstract
The invention discloses a fine fraction dry powder making system, which comprises a static powder selecting machine, a high-pressure roller mill, a first conveying belt, a second conveying belt, a bucket elevator, a dust remover and a ball mill; the static powder selecting machine comprises a mixture inlet, a primary air opening, a discharging air duct and a sand outlet, wherein a first hopper and a second hopper are correspondingly arranged above the mixture inlet and below the sand outlet respectively, and the discharging air duct is connected with the dust remover; the high-pressure roller mill is arranged below the second hopper, a first conveying belt is arranged below the high-pressure roller mill, and a bucket elevator is arranged at the upper end part of the first conveying belt; the upper part of the bucket elevator is provided with a second conveying belt, and the other end of the second conveying belt corresponds to the inlet of the upper part of the first hopper; the discharge port of the dust remover is connected with the feed port of the ball mill through a conveying device. The invention also discloses a fine fraction dry-process pulverizing process, which is used for realizing the dry-type separation of the two-millimeter fineness mineral aggregate in the mining industry for the first time, greatly improving the stability and reliability of a pulverizing system, reducing the energy consumption and improving the practicability of the pulverizing system.
Description
Technical Field
The invention belongs to the technical field of mine mill powder selection and preparation, and particularly relates to a fine-particle dry powder preparation system and a powder preparation process thereof, which are suitable for 2mm fine-particle dry powder preparation.
Background
At present, the traditional grinding and selecting powder process of mines generally adopts the steps that mineral aggregate is crushed by a high-pressure roller mill (cone crusher) and then is screened by a vibrating screen, the screened qualified materials are sent into a ball mill for crushing, and the unqualified materials are returned to the high-pressure roller mill again for crushing, so that circulation is realized. The traditional pulverizing process has a plurality of defects:
(1) The screening granularity of the vibrating screen is limited by equipment, dry screening can be selected only when the grain size is more than 5mm, and mineral materials with the grain size smaller than 5mm are screened by the vibrating screen because the meshes of the vibrating screen are too small and are easily blocked by minerals, so that a wet screening method is needed, namely water is needed to be added for flushing during the vibrating screen, a large amount of water resources are needed to be consumed, and meanwhile, the method is difficult to be implemented in water-deficient areas.
(2) After mineral materials are screened by adopting a wet screening method, the subsequent process is often complicated, because reasonable fine-particle-grade minerals and water enter a subsequent ball mill in the form of ore pulp, a buffer bin is not arranged in the middle, the ball mill is started for 24 hours generally, the whole system is required to continuously and stably feed for a long time, and once a certain link of a crushing system is in a problem, the whole production line is stopped, so that the process has high requirements on equipment stability. In addition, when routine maintenance is required for crushing equipment, winnowing equipment and the like, the whole production line must be stopped in a short time, and the production can be influenced to a certain extent.
(3) In the running process of the ball mill, the larger the particle size is, the larger the energy consumed by the ball mill is, and the production cost is increased.
Disclosure of Invention
Aiming at the defects of the existing wet powder process in the background technology, the invention creatively provides a fine-fraction dry powder process system and a powder process, which realize the dry separation of two-millimeter fineness mineral aggregate in the mine industry for the first time, greatly improve the stability and reliability of the powder process system, reduce the energy consumption and improve the practicability of the powder process system.
The technical scheme for solving the technical problems is as follows:
the invention relates to a fine fraction dry powder making system which is characterized by comprising a static powder selecting machine, a high-pressure roller mill, a first conveying belt, a bucket elevator, a second conveying belt, a dust remover and a ball mill; the static powder selecting machine comprises a mixture inlet, a primary air opening, a discharging air cylinder and a sand outlet, wherein a first hopper and a second hopper are respectively and correspondingly arranged above the mixture inlet and below the sand outlet, and the discharging air cylinder is connected with the dust remover; the high-pressure roller mill is arranged below the second hopper, a first conveying belt is arranged below the high-pressure roller mill, and a bucket elevator is arranged at the upper end part of the first conveying belt; the upper part of the bucket elevator is provided with the second conveying belt, and the other end of the second conveying belt corresponds to the upper inlet of the first hopper; the discharge port of the dust remover is connected with the feed port of the ball mill through a conveying device.
As a further improvement of the technical scheme of the invention, the dust remover further comprises a storage bin, and the discharge port of the dust remover is connected with the storage bin through a conveying device.
As a further improvement of the technical scheme of the invention, the secondary air port is arranged on the discharging air duct.
As a further improvement of the technical scheme of the invention, the included angle between the discharging air duct and the vertical direction is 45 degrees.
As a further improvement of the technical scheme of the invention, the wear-resistant steel plate is paved on the inner bin wall of the static powder concentrator.
As a further improvement of the technical scheme of the invention, the high-pressure roller mill is a hydraulic single-transmission high-pressure roller mill.
The invention discloses a fine fraction dry powder process, which is based on the fine fraction dry powder process system in the technical scheme, and comprises the following steps:
1. feeding the new mineral feed into a high-pressure roller mill for crushing, and then feeding the crushed material into a static powder selecting machine through a first conveying belt, a bucket elevator and a second conveying belt for winnowing;
2. fine-size ore materials selected by a static powder selecting machine are discharged through a dust remover and sent to a ball mill for crushing, and meanwhile, the selected coarse-size ore materials and new ore materials are sent to a high-pressure roller mill again for crushing, so that the circulation is realized.
As a further improvement of the technical scheme of the invention, after the fine-fraction mineral aggregate selected by the static powder concentrator is discharged by a dust remover, one path of mineral aggregate is sent to a ball mill for crushing, and the other path of mineral aggregate is sent to a storage bin.
As a further improvement of the technical scheme of the invention, the particle size of the fine fraction ore selected by the static powder concentrator is 2mm.
Compared with the prior art, the floating feeding device of the roller press has the following advantages:
1. the fine fraction dry powder preparation system is novel and reasonable in design, compact in structure, convenient to install and set, capable of being quickly put into use and relatively small in occupied area;
2. the static powder concentrator is used for replacing a vibrating screen in the traditional process, the static powder concentrator is added into the mine powder concentrating process for the first time, and the separation of the 2mm fine fraction ore materials is carried out by wind force, so that the separation of the 2mm fine fraction ore materials can be effectively realized, the dry separation of the 2mm fine fraction ore materials in the mine industry is realized for the first time, a water source is not required to be added in the whole separation process, the reliability and the practicability of the system are greatly improved, and meanwhile, the realization of the dry separation of the 2mm fine fraction ore materials can be thoroughly changed, the separation of the traditional mine powder concentrating process by wet screening is also avoided, and meanwhile, the complexity of the subsequent process is avoided;
3. the conventional static powder concentrator is mostly used for removing finely-divided minerals from sand aggregates, the selected coarse particle products are finished products, the coarse particle products are finely divided into impurities, and the materials which are generally below 0.5mm are required to be removed from coarse particle production openings; the static powder concentrator changes the conventional use method of the static powder concentrator, circularly feeding the separated coarse-grain mineral materials into a high-pressure roller mill for crushing again, and obtaining fine-grain minerals discharged from a dust remover, namely the finished products required in the powder process; in addition, the fine particle minerals are less than 2mm, the particle size ratio to be selected is more than 4 times that of the conventional powder selection, and the conventional static classifier is difficult to classify, the static classifier is optimally designed, a secondary air port is added on a discharging air duct for increasing the air quantity, meanwhile, the included angle between the discharging air duct and the vertical direction is adjusted to 45 degrees from 60 degrees of the conventional static classifier, so that the classification of mineral materials with the fine particle size of 2mm is facilitated, in addition, the abrasion resistance of impact is increased due to the increase of the classification particle size, and therefore, the abrasion-resistant structure of the bin wall of the air classifier is optimized, and the stability and the service life of equipment are improved by paving abrasion-resistant steel plates;
4. the qualified fine-fraction minerals and water in the traditional process enter the subsequent ball mill together in the form of ore pulp, so that no buffer bin is formed, and the ball mill is started up for 24 hours, so that the whole pulverizing system is continuously and stably fed for a long time, and once the crushing system has a problem, the whole pulverizing system is stopped; in addition, the fine-fraction mineral materials passing through the static winnowing machine can be sent into a storage bin, and when the crushing equipment is in a problem or routine maintenance, the fine-fraction mineral materials can be sent into the ball mill from the storage bin to realize buffering so as to ensure normal production;
5. the invention adopts the hydraulic single-transmission high-pressure roller mill, reduces the energy consumption of the system, and saves energy by about 30 percent compared with the conventional equipment.
Drawings
FIG. 1 is a schematic diagram of a fine fraction dry milling system according to the present invention;
FIG. 2 is a schematic diagram of the static powder concentrator and dust collector of the present invention;
FIG. 3 is a flow chart of the fine fraction dry milling process of the present invention;
in the figure: 1-bucket elevator; 2-high pressure roller mill; 3-a first conveyor belt; 4-a static powder selecting machine; 41-a mixture inlet; 42-primary tuyere; 43-a discharging air duct; 44-a sand outlet; 45-secondary air ports; 5-a second conveyor belt; 6-a dust remover; 7-a first hopper; 8-a second hopper; 9-a storage bin; 10-ball mill.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The present invention is not described in detail in the present application, and is well known to those skilled in the art.
Example 1:
as shown in fig. 1 and 3, the fine fraction dry pulverizing system of the present invention comprises a static classifier 4, a high pressure roller mill 2, a first conveyor belt 3, a bucket elevator 1, a second conveyor belt 5, a dust remover 6 and a ball mill 10; the static powder concentrator 4 comprises a feed mixture inlet 41, a primary air opening 42, a discharge air duct 43 and a sand outlet 44, wherein a first hopper 7 and a second hopper 8 are correspondingly arranged above the feed mixture inlet 41 and below the sand outlet 44 respectively, and the discharge air duct 43 is connected with the dust remover 6; the high-pressure roller mill 2 is arranged below the second hopper 8, a first conveying belt 3 is arranged below the high-pressure roller mill, and a bucket elevator 1 is arranged at the upper end part of the first conveying belt 3; the second conveyor belt 5 is arranged at the upper part of the bucket elevator 1, and the other end of the second conveyor belt 5 corresponds to the upper inlet of the first hopper 7; the discharge opening of the dust collector 6 corresponds to or communicates with the inlet opening of the ball mill 10 (not shown in fig. 1) through a conveying device (such as a belt conveyor, etc.). In this embodiment, the fine-fraction dry pulverizing system has a reasonable and compact structural design, changes the conventional usage of the static powder concentrator 4, discharges fine-fraction mineral materials discharged by the discharge air duct 43 to the dust remover 6 again to be used as finished products, and sends the finished products into the ball mill 10 to realize dry separation of mineral materials with fineness of 2mm in the mine industry, so that energy loss caused by conventional wet screening separation and complexity of subsequent processes are avoided, and meanwhile, coarse-fraction mineral materials discharged by the sand outlet 44 are sent to the high-pressure roller mill 2 together with new mineral materials again to be crushed again, so that the circulation is realized.
In this embodiment, the device further includes a bin 9 (not shown in fig. 1), where the discharge opening of the dust remover 6 corresponds to or is communicated with the feed opening of the bin 9 through a conveying device, and the bin 9 is used to store the fine mineral aggregate dry-sorted by the static powder concentrator 4, so that when the system is far away, the system can be used as a buffer bin, and when the crushing device fails or needs routine maintenance, the fine mineral aggregate can be taken out from the bin 9 and provided to the ball mill 10 for crushing operation, so as to ensure uninterrupted and orderly production.
In this embodiment, in order to effectively improve the dry-type sorting effect of the 2mm fineness mineral aggregate of the static powder concentrator 4, the secondary air port 45 is arranged on the discharging air duct 43 to improve the air quantity, in addition, the included angle between the discharging air duct 43 and the vertical direction is 45 degrees, the conventional 60-degree included angle setting between the discharging air duct of the traditional static powder concentrator and the vertical direction is changed, and the sorting effect of the fine-particle mineral aggregate is improved.
In this embodiment, wear-resistant steel plates are paved on the inner bin wall of the static powder concentrator 4, when the grain size of the sorted mineral aggregate reaches 2mm, the wear on the inner bin wall of the static powder concentrator 4 is large, and the stability and the service life of the static powder concentrator can be effectively improved by additionally arranging the wear-resistant steel plates.
In this embodiment, the high-pressure roller mill 2 is a hydraulic single-transmission high-pressure roller mill, so that the energy consumption is further reduced, and compared with the conventional equipment, the energy can be saved by about 30%.
Example 2:
the invention relates to a fine fraction dry powder process, which is carried out based on a fine fraction dry powder process system described in an embodiment 1, and comprises the following steps:
1) Feeding the new ore feed into a high-pressure roller mill for crushing, and feeding the crushed material into a static powder selecting machine through a first conveying belt, a bucket elevator and a second conveying belt for winnowing;
2) And discharging the fine-particle ore materials selected by the static powder selector through a dust remover, conveying the fine-particle ore materials to a ball mill for crushing, and conveying the selected coarse-particle ore materials and the new ore materials to a high-pressure roller mill for crushing again, thereby recycling.
In this embodiment, after the fine-fraction mineral aggregate selected by the static powder separator is discharged through the dust remover, one path of the fine-fraction mineral aggregate can be sent to the ball mill for crushing, and the other path of the fine-fraction mineral aggregate is sent to the storage bin, so that when equipment such as a high-pressure roller mill malfunctions or needs routine maintenance, the fine-fraction mineral aggregate can be directly sent to the ball mill from the storage bin for crushing, thereby ensuring normal production.
In the embodiment, the particle size of the fine fraction ore selected by the static powder concentrator is 2mm, and the particle size is realized by adopting a dry winnowing mode for the first time in the mine industry, so that the subsequent process flow is greatly optimized.
The fine fraction dry pulverizing system and pulverizing process change the traditional wet screening mineral aggregate in mine industry and enter the following process flow of pulverizing by the ball mill in the form of ore pulp, realize the dry separation of the fine fraction mineral aggregate of 2mm for the first time, effectively reduce the complexity of the following process flow, promote the stability, reliability and integrity of the whole pulverizing system, avoid the loss of water resources and other energy consumption, greatly reduce the process difficulty compared with the traditional process, have very good economic benefit and social benefit, and are particularly suitable for water-deficient areas to use, and have very good practicability.
Claims (4)
1. The 2mm fine fraction dry powder making system is characterized by comprising a bucket elevator (1), a high-pressure roller mill (2), a first conveying belt (3), a static powder selector (4), a second conveying belt (5), a dust remover (6) and a ball mill (10); the static powder concentrator (4) comprises a feeding mixture inlet (41), a primary air opening (42), a discharging air cylinder (43) and a sand outlet (44), a first hopper (7) and a second hopper (8) are correspondingly arranged above the mixture inlet (41) and below the sand outlet (44), the discharging air cylinder (43) is connected with the dust remover (6), and the included angle between the discharging air cylinder (43) and the vertical direction is 45 degrees; the high-pressure roller mill (2) is arranged below the second hopper (8), a first conveying belt (3) is arranged below the high-pressure roller mill, and a bucket elevator (1) is arranged at the upper end part of the first conveying belt (3); the upper part of the bucket elevator (1) is provided with the second conveying belt (5), and the other end of the second conveying belt (5) corresponds to the upper inlet of the first hopper (7); the discharge port of the dust remover (6) is connected with the feed port of the ball mill (10) through a conveying device; a secondary air port (45) is arranged on the discharging air duct (43); a wear-resistant steel plate is paved on the inner bin wall of the static powder concentrator (4); the high-pressure roller mill (2) is a single-transmission high-pressure roller mill.
2. A 2mm fine fraction dry milling system according to claim 1, further comprising a silo (9), wherein the discharge opening of the dust separator (6) is connected to the silo (9) by means of a transport device.
3. A 2mm fine fraction dry milling process, characterized in that it is based on a 2mm fine fraction dry milling system according to claim 1 or 2, comprising the steps of:
1) Feeding the new ore feed into a high-pressure roller mill for crushing, and feeding the crushed material into a static powder selecting machine through a first conveying belt, a bucket elevator and a second conveying belt for winnowing;
2) And discharging the fine-size-fraction ore materials selected from the discharging air duct of the static powder concentrator through a dust remover to obtain a finished product of the fine-size-fraction ore materials with the size of 2mm, and simultaneously, feeding the selected coarse-size-fraction ore materials and the new ore materials into a high-pressure roller mill again for crushing, thereby circulating.
4. A 2mm fine fraction dry milling process according to claim 3, wherein the fine fraction mineral material selected by the static classifier is discharged by a dust collector, and one of the fine fraction mineral material is sent to a ball mill, and the other fine fraction mineral material is sent to a storage bin.
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| CN202010472402.7A CN111570064B (en) | 2020-05-29 | 2020-05-29 | 2mm fine fraction dry powder preparation system and powder preparation process thereof |
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| CN202010472402.7A CN111570064B (en) | 2020-05-29 | 2020-05-29 | 2mm fine fraction dry powder preparation system and powder preparation process thereof |
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| CN111570064B true CN111570064B (en) | 2024-01-26 |
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