CN111822129A - Iron ore dry grinding and dressing device and process - Google Patents

Iron ore dry grinding and dressing device and process Download PDF

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Publication number
CN111822129A
CN111822129A CN202010709886.2A CN202010709886A CN111822129A CN 111822129 A CN111822129 A CN 111822129A CN 202010709886 A CN202010709886 A CN 202010709886A CN 111822129 A CN111822129 A CN 111822129A
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China
Prior art keywords
grinding
powder
ore
magnetic
fine
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CN202010709886.2A
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Chinese (zh)
Inventor
宋留庆
聂文海
徐达融
刘洋
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Sinoma Tianjin Powder Technology & Equipment Co ltd
Tianjin Cement Industry Design and Research Institute Co Ltd
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Sinoma Tianjin Powder Technology & Equipment Co ltd
Tianjin Cement Industry Design and Research Institute Co Ltd
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Priority to CN202010709886.2A priority Critical patent/CN111822129A/en
Publication of CN111822129A publication Critical patent/CN111822129A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00Disintegrating plant with or without drying of the material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00Magnetic separation
    • B03C1/02Magnetic separation acting directly on the substance being separated
    • B03C1/30Combinations with other devices, not otherwise provided for
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B9/00Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • B07B9/02Combinations of similar or different apparatus for separating solids from solids using gas currents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C2015/002Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier

Abstract

The invention belongs to the technical field of metal ore grinding processes, and particularly relates to an iron ore dry-method ore grinding and dressing device and process, which can realize that raw ore is processed into ore with the size of below 80mm through coarse crushing, pre-tailing discarding and the like of a gyratory crusher, a cone crusher, a magnetic separator and other equipment, then a vertical roller mill is adopted to replace conventional multistage ore grinding equipment to crush the raw ore, a giant micro powder sieve machine and a plurality of magnetic separators are matched to form a closed-loop circulating grinding and magnetic separation system, the ore is crushed to the size of P80 which is less than or equal to 2mm, the magnetic ore is highly dissociated with tailings, the dressing percentage is greatly improved, and finally concentrate and tailings are obtained in the working section; and then, the closed-loop circulating fine grinding system is used for finishing the rich ore fine grinding of the fine grinding section, the fineness can reach P80 which is 200-400 meshes, the fineness can be flexibly adjusted on line by adjusting parameters such as vertical grinding roll pressure, fan air volume, powder concentrator rotating speed and the like, the specific fineness is determined according to the concentration rate and grade of valuable components, and the high-grade iron ore concentrate can be conveniently obtained by mixing and stirring with water for wet magnetic separation in the later stage.

Description

Iron ore dry grinding and dressing device and process
Technical Field
The invention belongs to the technical field of metal ore grinding processes, and particularly relates to an iron ore dry-method ore grinding and dressing device and process.
Background
Iron ore resources in China are rich, but the method mainly has the characteristics of more lean ores, less rich ores, more types of associated ores, complex components and the like. The ore fine grinding is an effective method for improving the mineral separation efficiency, but the fine grinding consumes more energy consumption and increases the equipment operation and maintenance cost, the existing ore fine grinding method mainly adopts the ball mill wet grinding, the process has long history, the technology is mature and stable, but a large amount of water resources are consumed, the environment is poor, the grain diameter difference of the finished product of the ball mill is large, the energy consumption and the consumption of a grinding body are large, and the construction investment and the production cost are huge.
In recent years, a crushing system of a high-pressure roller mill is widely popularized in the mineral separation industry, and after the high-pressure roller mill crushes to below 3mm for magnetic separation, a wet closed-circuit grinding system consisting of a ball mill and a vortex powder separator or a ball mill, a tower mill and a vortex powder separator and the like grinds ores. However, the high-pressure roller mill in the whole ore grinding section only grinds 40mm coarse ore to be less than 3mm, the process power consumption is only 3-4kw.h/t, the energy-saving effect is not obvious, and the purposes of saving energy, saving water and reducing consumption of an ore system can be achieved only by enabling energy-saving and high-efficiency dry grinding equipment to participate in the downstream fine grinding section. The mined raw ore needs to pass through a gyratory crusher, an inertia cone crusher, a conveying belt machine, a screening machine and the like to form a closed-loop circulating crushing system for circulating crushing, so that the requirement of the high-pressure roller mill on the ore feeding granularity can be met, and the complex process has large investment.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a large-yield low-production-cost iron ore dry-method ore grinding and dressing device and process.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows:
a dry grinding and dressing device for iron ore comprises an original ore material, a coarse crushing and magnetic separation system, a closed cycle coarse grinding and magnetic separation system and a closed cycle fine grinding system;
the rough crushing and magnetic separation system comprises a gyratory crusher, a conveying belt, a cone crusher and a magnetic separator which are connected in sequence; the closed-cycle coarse grinding and magnetic separation system comprises a raw material conveying belt, a coarse grinding vertical roller mill, a grinding belt outlet machine, a giant micro powder screening machine, a feed back belt conveyor and a plurality of magnetic separators, wherein an oversize coarse material outlet of the micro powder screening machine is connected with an inlet of a first magnetic separator, and the first magnetic separator comprises a first magnetite outlet and a first tailing outlet; the first magnetite outlet is connected with a feed back belt conveyor; the undersize fine material outlet of the micropowder screening machine is connected with the inlet of a second magnetic separator, and the second magnetic separator comprises a second magnetic ore outlet and a second tailing outlet; the second magnetic ore outlet is connected with the inlet of a third magnetic separator; the third magnetic separator comprises a lean ore outlet and a rich ore outlet, the lean ore outlet is connected with the feed back belt conveyor, and the rich ore outlet is communicated with the fine grinding section;
the closed-cycle fine grinding system comprises a fine grinding vertical roller mill, a lifter, a combined powder concentrator and an iron ore powder gas-solid separation system which are sequentially connected.
In a further technical scheme, the gas-solid separation system comprises a cyclone, a circulating fan, a dust collector, a tail exhaust fan, a powder belt and an exhaust chimney.
In a further technical scheme, the gas-solid separation system comprises a dust collector, a circulating fan, a powder belt and an exhaust chimney. In a further technical scheme, the vertical mill comprises a vertical mill shell, a feeding port, a feeding chute, a frame, a driving device, a grinding roller, a grinding disc, a material blocking ring, a material scraping plate, an air chamber and a discharge port; the driving device comprises an oil cylinder and a motor.
In a further technical scheme, the feeding port is communicated with a feeding chute fixed at the center of the top of the shell, and the grinding roller can rotate in the grinding disc device and keeps a safe distance from the grinding disc; the materials enter the mill from the feeding port and reach the millstone through the feeding chute, the grinding roller applying pressure through the oil cylinder is matched with the millstone driven by the motor to rotate so as to finish the grinding of the materials on the millstone, and the ground materials slide to the edge of the millstone under the action of the rotating centrifugal force of the millstone, reach the edge of the millstone and fall into the air chamber below the millstone through the material stop ring; and a certain number of scraping plates are arranged in the air chamber at equal intervals along the circumferential direction of the grinding disc body, and the scraping plates are used for scraping all materials falling into the air chamber to a discharge port for discharge.
In a further technical scheme, the edge of the grinding disc is provided with a material blocking ring, and the height of the material blocking ring is 2% -4% of the diameter of the grinding disc.
In a further technical scheme, the number of the scraping plates is more than one time that of the scraping plates of a conventional vertical mill, and the distance between the installation position and the bottom plate of the air chamber is 20-40 mm, and the distance between the installation position and the side wall of the air chamber is 70-120 mm.
In a further technical scheme, the invention also discloses a mineral separation process of the iron ore dry-method grinding and mineral separation device, which comprises the following steps:
s1, firstly, preparing the original mineral aggregate into ore A with the granularity less than or equal to 80mm through a coarse crushing and magnetic separation system;
s2, performing a coarse grinding process on the ore A by using a closed-loop circulating coarse grinding and magnetic separation system: feeding ores A with the granularity less than or equal to 80mm into a coarse grinding vertical roller mill through a raw material conveying belt, grinding the ores A by a grinding roller and a grinding disc, discharging the ores A out of the mill, conveying the ores A into a micro powder screening machine through a grinding belt machine, feeding coarse materials on a screen of the micro powder screening machine into a first magnetic separator for magnetic separation and tailing removal, returning the coarse materials to the coarse grinding vertical roller mill for grinding again until the granularity is qualified; feeding the sieved material with the fineness P80 of less than or equal to 2mm into a second magnetic separator for strong magnetic dry separation, and feeding the magnetic ore into a third magnetic separator for weak magnetic dry separation to obtain rich ore and lean ore; the lean ore of the third magnetic separator returns to the feed back belt conveyor and enters the coarse grinding vertical roller mill for grinding again until the granularity is qualified; the rich ore of the third magnetic separator enters a fine grinding section; the tailings of the first magnetic separator and the second magnetic separator are discharged to a specified tailings storage yard;
s3, implementing a fine grinding section by a closed-loop circulating fine grinding system; feeding the rich ore and the materials discharged from the fine grinding vertical roller mill into a combined type powder concentrator through a lifter for wind power separation, wherein the combined type powder concentrator comprises a dynamic powder concentrator arranged at the upper part and a V-shaped static powder concentrator arranged at the lower part; the material firstly enters the V-shaped powder concentrator at the lower part for air separation, fine particles and powder are carried by air to enter the dynamic powder concentrator at the upper part for fine powder separation, and fine powder meeting the fineness requirement enters the gas-solid separation system to realize the separation of mineral aggregate and air flow.
In a further technical scheme, most of fine powder separated by the upper dynamic powder separator in the step S3 is collected by a cyclone cylinder connected with the dynamic powder separator, and a small amount of fine powder is collected and purified by a dust collector connected with an air outlet of a circulating fan and is discharged into a chimney through a tail exhaust fan; coarse powder enters the fine grinding vertical roller mill from a discharge port of the V-shaped powder concentrator for continuous grinding, is discharged outside the fine grinding vertical roller mill after being adhered and ground by a grinding roller and a grinding disc, and is fed into the combined powder concentrator by a lifter again for wind power separation until the coarse powder completely meets the fineness requirement; and the powder belt takes away the mineral aggregate discharged by the cyclone and the dust collector to carry out the next wet magnetic separation process.
In a further technical scheme, all fine powder separated by the upper dynamic powder concentrator in the step S3 is collected and purified by a dust collector connected with an air outlet of the circulating fan and is discharged into a chimney through a tail exhaust fan; coarse powder enters the fine grinding vertical roller mill from a discharge port of the V-shaped powder concentrator for continuous grinding, is discharged outside the fine grinding vertical roller mill after being adhered and ground by a grinding roller and a grinding disc, and is fed into the combined powder concentrator by a lifter again for wind power separation until the coarse powder completely meets the fineness requirement; and the powder belt takes away the mineral aggregate discharged by the cyclone and the dust collector to carry out the next wet magnetic separation process.
Has the advantages and positive effects that:
according to the invention, raw ores are processed into ores with the size below 80mm through coarse crushing, pre-tailing discarding and the like of a gyratory crusher, a cone crusher, a magnetic separator and other equipment, then the vertical roller mill is adopted to replace conventional ore grinding equipment to crush the ores, a giant micro powder sieve and a plurality of magnetic separators are matched to form a closed cycle coarse grinding and magnetic separation system, the ores are crushed to the size P80 of less than or equal to 2mm, the magnetic ores and tailings are highly dissociated, the beneficiation efficiency is greatly improved, and finally concentrate and tailings are obtained in the working section; and then the closed-loop circulating fine grinding system is used for finishing the rich ore fine grinding of the fine grinding section, the fineness can reach P80 ═ 200-. In a word, the process flow of the invention has simple design, high automation degree, environmental protection, small occupied area, less water consumption for mineral separation, high ore dressing rate, high grade of the obtained iron ore concentrate, low construction investment and low production energy consumption.
Drawings
FIG. 1 is a process flow diagram in example 1 of the present invention;
FIG. 2 is an enlarged view of a portion of the three magnetic separators of FIGS. 1 and 2;
FIG. 3 is a schematic view of the rough grinding vertical roller mill of the present invention;
FIG. 4 is an enlarged view of the scraper plate and plenum position of the present invention;
FIG. 5 is a process flow diagram in example 2 of the present invention.
Wherein:
1. a coarse breaking and magnetic separation system; 2-1, a raw material conveying belt; 2-2, discharging the belt grinding machine; 2-3, a feed back belt conveyor; 3. coarsely grinding the vertical roller mill; 31. vertically grinding the shell; 32. a feeding port; 33. a feeding chute; 34. a grinding disc; 35. grinding the roller; 36. an air chamber; 37. a discharge outlet; 38. a material blocking ring; 39. a scraping plate; 4. a micro powder screening machine; 5-1, a first magnetic separator; 5-1a, a first magnetite outlet; 5-1b, a first tailing outlet; 5-2, a second magnetic separator; 5-2a, a second magnetic ore outlet; 5-2b, a second tailing outlet; 5-3, a third magnetic separator; 5-3a, a lean ore outlet; 5-3b, a rich ore outlet; 6. a hoist; 7. a combined powder concentrator; 7-1, dynamic powder selecting machine; 7-2, V-shaped powder selecting machine; 8. finely grinding the vertical roller mill; 9. a cyclone; 10. a circulating fan; 11. a dust collector; 12. a tail exhaust fan; 13. a powder belt; 14. and (4) a chimney.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
example 1
As shown in FIGS. 1-4, the invention discloses a dry grinding and beneficiation process for iron ore, which comprises the following steps:
s1, firstly, preparing the original mineral aggregate into ore A with the granularity less than or equal to 80mm through a coarse crushing and magnetic separation system 1; the rough crushing and magnetic separation system 1 comprises a gyratory crusher, a conveying belt, a cone crusher and a magnetic separator which are connected in sequence;
s2, performing a coarse grinding process on the ore A by using a closed-loop circulating coarse grinding and magnetic separation system: the closed-cycle coarse grinding and magnetic separation system comprises a raw material conveying belt 2-1, a coarse grinding vertical roller mill 3, a grinding belt discharging machine 2-2, a giant micro powder screening machine 4, a feed back belt conveyor 2-3 and a plurality of magnetic separators; an oversize coarse material outlet at the bottom of the micro powder sieving machine 4 is connected with an inlet of a first magnetic separator 5-1, and the first magnetic separator 5-1 comprises a first magnetite outlet 5-1a and a first tailing outlet 5-1 b; the first magnetite outlet 5-1a is connected with a feed back belt conveyor 2-3; a fine material outlet under the sieve on one side of the micro powder sieving machine 4 is connected with an inlet of a second magnetic separator 5-2, and the second magnetic separator 5-2 comprises a second magnetic ore outlet 5-2a and a second tailing outlet 5-2 b; the second magnetic ore outlet 5-2a is connected with the inlet of a third magnetic separator 5-3; the third magnetic separator 5-3 comprises a lean ore outlet 5-3a and a rich ore outlet 5-3b, the lean ore outlet 5-3a is connected with the feed back belt conveyor 2-3, and the rich ore outlet 5-3b leads to a fine grinding section; specifically, ore A with the particle size of less than or equal to 80mm is fed into a coarse grinding vertical roller mill 3 through a raw material conveying belt 2-1, is ground by a grinding roller and a grinding disc and then is discharged out of the mill, is conveyed into a micro powder screening machine 4 through a grinding belt discharging machine 2-2, and is returned to the coarse grinding vertical roller mill 3 for grinding again after the oversize coarse material on the micro powder screening machine enters a first magnetic separator 5-1 for magnetic separation and tailing discarding treatment until the particle size is qualified; feeding the sieved material with the fineness P80 of less than or equal to 2mm into a second magnetic separator 5-2 for strong magnetic dry separation, feeding the magnetic ore into a third magnetic separator 5-3 for weak magnetic dry separation, and obtaining rich ore and lean ore; the lean ore of the third magnetic separator 5-3 returns to the feed back belt conveyor 2-3 and enters the coarse grinding vertical roller mill 3 for grinding again until the granularity is qualified; the rich ore of the third magnetic separator 5-3 enters a fine grinding section; the tailings of the first magnetic separator 5-1 and the second magnetic separator 5-2 are discharged to a specified tailings storage yard;
s3, implementing a fine grinding section by a closed-loop circulating fine grinding system; the closed-cycle fine grinding system comprises a fine grinding vertical roller mill 8, a lifter 6, a combined powder concentrator 7 and a gas-solid separation system which are connected in sequence; the gas-solid separation system comprises a cyclone cylinder 9, a circulating fan 10, a dust collector 11, a tail exhaust fan 12, a powder belt 13 and an exhaust chimney 14; materials of the rich ore and the fine grinding vertical roller mill are fed into a combined type powder concentrator 7 through a lifter 6 for wind separation, and the combined type powder concentrator 7 comprises a dynamic powder concentrator 7-1 arranged at the upper part and a V-shaped powder concentrator 7-2 arranged at the lower part; the materials firstly enter a V-shaped powder separator 7-2 at the lower part for winnowing, coarse powder enters a fine grinding vertical roller mill from a discharge port at the bottom of the V-shaped powder separator for continuous grinding, is discharged outside the fine grinding vertical roller mill after being adhered and ground by a grinding roller and a grinding disc, and is fed into a combined powder separator by a lifter again for wind separation until the fineness requirement is completely met; the fineness of the mineral aggregate can reach P80 ═ 200-; the powder belt takes away the mineral aggregate discharged by the cyclone and the dust collector to carry out the next wet magnetic separation process; fine particles and powder are carried by air to enter an upper dynamic powder concentrator to complete fine powder separation, most of the fine powder separated by the upper dynamic powder concentrator is collected by a cyclone cylinder connected with the dynamic powder concentrator, a small amount of fine powder is collected by a dust collector connected with an air outlet of a circulating fan, and purified clean air is discharged into a chimney through a tail exhaust fan; the dust concentration of the tail exhaust fan meets the environmental protection emission standard; the fine powder meeting the fineness requirement enters a gas-solid separation system to realize the separation of mineral aggregate and air flow;
preferably, the vertical mill comprises a vertical mill shell 31, a feeding port 32, a frame, a driving device, a feeding chute 33, a grinding disc 34, a grinding roller 35, an air chamber 36, a discharge port 37, a material blocking ring 38 and a scraper plate 39. The grinding roller can rotate on the grinding disc device and keeps a safe distance with the grinding disc; the driving device comprises an oil cylinder and a motor; the materials enter the mill from the feeding port and reach the millstone through the feeding chute, the grinding roller applying pressure through the oil cylinder is matched with the millstone driven by the motor to rotate so as to finish the grinding of the materials on the millstone, and the ground materials slide to the edge of the millstone under the action of the rotating centrifugal force of the millstone, reach the edge of the millstone and fall into the air chamber below the millstone through the material stop ring; the scraping plates are arranged in the air chamber at equal intervals along the circumferential direction of the grinding disc body and used for scraping all materials falling into the air chamber to a discharge port to be discharged, and the materials are conveyed to the micro-powder sieve and the magnetic separator through belts to complete sieving, magnetic separation and tailing discarding.
Preferably, the number of the grinding rollers 37 can be 2, 3, 4 or 6, the specific number is determined according to the specification of the vertical roller mill 3, each grinding roller 37 is independently pressurized by a hydraulic system, the vibration value of the operation of the mill can be reduced, the pressure of the grinding rollers 37 is regulated and controlled by the hydraulic system, the materials are ground by the pressure and the friction force of the grinding rollers 37, the grinding rollers 37 are not directly contacted with the grinding disc 36, the energy loss is small, wear-resistant ceramic materials are adopted for roller sleeves of the grinding rollers 37 and lining plates of the grinding disc 36, the problem of large abrasiveness of iron ores is well solved, and the service life of the grinding rollers is prolonged by 2-3 times compared with common surfacing materials.
The wind speed of the wind guide blade gap of the powder concentrator 34 is more than 18m/s, the linear speed of a rotor of the powder concentrator 34 is 11-16m/s, the wind speed and the linear speed of the rotor are designed according to the performance of iron ore and the fineness of finished products, the powder concentration efficiency is high, and the over-grinding phenomenon can be avoided.
The material blocking ring 311 is arranged along the circumferential edge of the grinding disc 36, the height of the material blocking ring 311 is generally 3.5-5.5% of the diameter of the grinding disc 36, the stability of a material bed can be ensured, water spraying can be increased when necessary, and the vibration of the grinding machine is reduced.
The number of the scraping plates 310 is more than one time than that of the conventional vertical mill, the distance between the scraping plates 310 and the bottom plate of the air chamber is 20-40 mm, and the distance between the scraping plates 310 and the side wall of the air chamber is 70-120 mm, so that enough material layers are ensured to be arranged at the bottom and the outer side of the scraping plates 310 during the operation of the vertical roller mill 3, and the shell mill leakage is avoided.
The structure of the fine grinding vertical roller mill is the same as that of the rough grinding vertical roller mill, and the detailed description is omitted here. Compared with the traditional mineral processing technology, the vertical roller mill has simple technological process, energy-saving and high-efficiency crushing and grinding processes, can reduce mineral processing production cost and improve resource utilization rate. The metering steady flow bin can store raw materials with 30 percent of hourly output of the vertical roller mill, so that a feeding system can continuously and stably feed the raw materials, and the bin-promoted shutdown is not needed when the raw material conveying system fails.
Example 2
As shown in fig. 5, the present embodiment is different from embodiment 1 in that the gas-solid separation system in S3 includes a dust collector 11, a circulating fan 10, a powder belt 13, and an exhaust stack 14; rich ore and milled materials are fed into a combined type powder concentrator 7 through a lifter 6 for wind power separation, and the combined type powder concentrator 7 comprises a dynamic powder concentrator 7-1 arranged at the upper part and a V-shaped powder concentrator 7-2 arranged at the lower part; the material enters the V-shaped powder selector 7-2 at the lower part for air separation, fine particles and powder are carried by air to enter the dynamic powder selector at the upper part for fine powder selection, all fine powder selected by the dynamic powder selector at the upper part is collected by a dust collector connected with an air outlet of a circulating fan, and purified clean air is discharged into a chimney through a tail exhaust fan; the dust concentration of the tail exhaust fan meets the environmental protection emission standard; the fine powder meeting the fineness requirement enters a gas-solid separation system to realize the separation of mineral aggregate and air flow.
Example 2 differs from example 1 in terms of cost: under the condition of consistent processing air volume, the embodiment 1 can meet the use requirement by using a dust collector with small specification due to the addition of the cyclone; the total investment cost of the embodiment is low and the occupied area is small because the cost of the cyclone is low; in the embodiment 2, a large-size dust collector with higher cost needs to be matched, so the total cost is higher than that of the embodiment 1; and (3) equipment abrasion: in the embodiment 1, the unclean fine powder collected by the cyclone cylinder can enter the circulating fan and cause scouring abrasion to the fan blades; and the dust collector with large specification in the embodiment 2 collects the fine powder more cleanly, the air entering the circulating fan is very clean, and the abrasion to the fan blade is small, so that the circulating fan in the embodiment 2 has long service life.
The invention completely replaces a wet grinding system consisting of a ball mill and a cyclone classifier in the prior art through a fine grinding section, thereby saving the electricity consumption, the abrasion and the water consumption; the vertical roller mill is adopted to replace the conventional ore grinding equipment to grind ores with the diameter less than 80mm, then the ores are ground to the diameter P80 less than or equal to 2mm in a closed-loop circulating coarse grinding and magnetic separation system, the magnetic minerals and tailings are separated at equal height, the dressing rate is greatly improved, and finally concentrate and tailings are obtained in the working section; and then, completing the ore-rich fine grinding of the preorder fine-crushing section by a closed-loop circulation fine grinding system, wherein the fineness can reach P80 ═ 200-. The process flow is simple in design, high in automation degree, environment-friendly, small in occupied area, low in water consumption for mineral separation, high in ore dressing rate, high in grade of obtained iron ore concentrate, low in construction investment and low in production energy consumption.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The utility model provides an iron ore dry process ore grinding ore dressing device which characterized in that: the method comprises the steps that the original mineral aggregate passes through a coarse crushing and magnetic separation system, a closed-loop circulating coarse grinding and magnetic separation system and a closed-loop circulating fine grinding system;
the rough crushing and magnetic separation system comprises a gyratory crusher, a conveying belt, a cone crusher and a magnetic separator which are connected in sequence; the closed-cycle coarse grinding and magnetic separation system comprises a raw material conveying belt, a coarse grinding vertical roller mill, a grinding belt outlet machine, a giant micro powder screening machine, a feed back belt conveyor and a plurality of magnetic separators, wherein an oversize coarse material outlet of the micro powder screening machine is connected with an inlet of a first magnetic separator, and the first magnetic separator comprises a first magnetite outlet and a first tailing outlet; the first magnetite outlet is connected with a feed back belt conveyor; the undersize fine material outlet of the micropowder screening machine is connected with the inlet of a second magnetic separator, and the second magnetic separator comprises a second magnetic ore outlet and a second tailing outlet; the second magnetic ore outlet is connected with the inlet of a third magnetic separator; the third magnetic separator comprises a lean ore outlet and a rich ore outlet, the lean ore outlet is connected with the feed back belt conveyor, and the rich ore outlet is communicated with the fine grinding section;
the closed-cycle fine grinding system comprises a fine grinding vertical roller mill, a lifter, a combined powder concentrator and an iron ore powder gas-solid separation system which are sequentially connected.
2. The iron ore dry grinding and dressing apparatus according to claim 1, characterized in that: the gas-solid separation system comprises a cyclone cylinder, a circulating fan, a dust collector, a tail exhaust fan, a powder belt and an exhaust chimney.
3. The iron ore dry grinding and dressing apparatus according to claim 1, characterized in that: the gas-solid separation system comprises a dust collector, a circulating fan, a powder belt and an exhaust chimney.
4. The iron ore dry grinding and dressing apparatus according to claim 1, characterized in that: the vertical mill comprises a vertical mill shell, a feeding port, a feeding chute, a frame, a driving device, a grinding roller, a grinding disc, a material blocking ring, a scraping plate, an air chamber and a discharge port; the driving device comprises an oil cylinder and a motor.
5. The iron ore dry grinding and beneficiation plant according to claim 4, wherein: the grinding roller can rotate in the grinding disc device and keeps a certain safe distance from the grinding disc; the materials enter the mill from the feeding port and reach the millstone through the feeding chute, the grinding roller applying pressure through the oil cylinder is matched with the millstone driven by the motor to rotate so as to finish the grinding of the materials on the millstone, and the ground materials slide to the edge of the millstone under the action of the rotating centrifugal force of the millstone, reach the edge of the millstone and fall into the air chamber below the millstone through the material stop ring; the scraping plates are arranged in the air chamber at equal intervals along the circumferential direction of the grinding disc body and used for scraping all materials falling into the air chamber to a discharge port to be discharged, and the materials are conveyed to the micro-powder sieve and the magnetic separator through belts to complete sieving, magnetic separation and tailing discarding.
6. The iron ore dry grinding and beneficiation plant according to claim 4, wherein: the edge of the grinding disc of the vertical mill is provided with a material blocking ring, and the height of the material blocking ring is 2% -4% of the diameter of the grinding disc.
7. The iron ore dry grinding and beneficiation plant according to claim 4, wherein: the number of the scraping plates is more than one time than that of the conventional vertical mill, and the distance between the installation position and the bottom plate of the air chamber is 20-40 mm, and the distance between the installation position and the side wall of the air chamber is 70-120 mm.
8. The beneficiation process of the iron ore dry grinding beneficiation plant according to claim 2 or 3, characterized by comprising the steps of:
s1, firstly, preparing the original mineral aggregate into ore A with the granularity less than or equal to 80mm through a coarse crushing and magnetic separation system;
s2, performing a coarse grinding process on the ore A by using a closed-loop circulating coarse grinding and magnetic separation system: feeding ores A with the granularity less than or equal to 80mm into a coarse grinding vertical roller mill through a raw material conveying belt, grinding the ores A by a grinding roller and a grinding disc, discharging the ores A out of the mill, conveying the ores A into a micro powder screening machine through a grinding belt machine, feeding coarse materials on a screen of the micro powder screening machine into a first magnetic separator for magnetic separation and tailing removal, returning the coarse materials to the coarse grinding vertical roller mill for grinding again until the granularity is qualified; feeding the sieved material with the fineness P80 of less than or equal to 2mm into a second magnetic separator for strong magnetic dry separation, and feeding the magnetic ore into a third magnetic separator for weak magnetic dry separation to obtain rich ore and lean ore; the lean ore of the third magnetic separator returns to the feed back belt conveyor and enters the coarse grinding vertical roller mill for grinding again until the granularity is qualified; the rich ore of the third magnetic separator enters a fine grinding section; the tailings of the first magnetic separator and the second magnetic separator are discharged to a specified tailings storage yard;
s3, implementing a fine grinding section by a closed-loop circulating fine grinding system; feeding the rich ore and the materials discharged from the fine grinding vertical roller mill into a combined type powder concentrator through a lifter for wind power separation, wherein the combined type powder concentrator comprises a dynamic powder concentrator arranged at the upper part and a V-shaped static powder concentrator arranged at the lower part; the material firstly enters the V-shaped powder concentrator at the lower part for air separation, fine particles and powder are carried by air to enter the dynamic powder concentrator at the upper part for fine powder separation, and fine powder meeting the fineness requirement enters the gas-solid separation system to realize the separation of mineral aggregate and air flow.
9. The beneficiation process of the iron ore dry grinding beneficiation device according to claim 8, wherein: most of fine powder separated by the dynamic powder separator at the middle upper part of the S3 is collected by a cyclone cylinder connected with the dynamic powder separator, a small amount of fine powder is collected by a dust collector connected with an air outlet of a circulating fan, and purified clean air is discharged into a chimney through a tail exhaust fan; coarse powder enters a fine grinding vertical roller mill from a discharge port at the bottom of the V-shaped powder separator to be continuously ground, is discharged outside the fine grinding vertical roller mill after being adhered and ground by a grinding roller and a grinding disc, and is fed into the combined powder separator by a lifter again to be separated by wind power until all the coarse powder meets the fineness requirement; and the powder belt takes away the mineral aggregate discharged by the cyclone and the dust collector to carry out the next wet magnetic separation process.
10. The beneficiation process of the iron ore dry grinding beneficiation device according to claim 8, wherein: the fine powder separated by the upper dynamic powder concentrator in the step S3 is collected and purified by a dust collector connected with an air outlet of the circulating fan, and the purified clean air is discharged into a chimney through a tail exhaust fan; coarse powder enters the fine grinding vertical roller mill from a discharge port of the V-shaped powder concentrator for continuous grinding, is discharged outside the fine grinding vertical roller mill after being adhered and ground by a grinding roller and a grinding disc, and is fed into the combined powder concentrator by a lifter again for wind power separation until the coarse powder completely meets the fineness requirement; and the powder belt takes away the mineral aggregate discharged by the cyclone and the dust collector to carry out the next wet magnetic separation process.
CN202010709886.2A 2020-07-22 2020-07-22 Iron ore dry grinding and dressing device and process Withdrawn CN111822129A (en)

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Application publication date: 20201027