CN114602629B - Efficient method for magnetic ore full-size-fraction preselection - Google Patents
Efficient method for magnetic ore full-size-fraction preselection Download PDFInfo
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- CN114602629B CN114602629B CN202210385351.3A CN202210385351A CN114602629B CN 114602629 B CN114602629 B CN 114602629B CN 202210385351 A CN202210385351 A CN 202210385351A CN 114602629 B CN114602629 B CN 114602629B
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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
- B02C21/00—Disintegrating plant with or without drying of the material
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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
- B02C1/00—Crushing or disintegrating by reciprocating members
- B02C1/02—Jaw crushers or pulverisers
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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
- 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
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/025—High gradient magnetic separators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING 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
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a high-efficiency method for full-size-fraction preselection of magnetic ores, which comprises the following steps: A. coarse crushing-sieving: coarse crushing raw ore by a jaw crusher, sieving the coarse crushed material by a bar screen, feeding the sieved raw ore into the jaw crusher for medium crushing, sieving the medium crushed material by a first linear vibrating screen, and merging the bar screen and the products sieved by the linear vibrating screen into the next operation; B. and (3) screening and classifying: sequentially feeding the crushed materials into a second linear vibrating screen and a third linear vibrating screen, and screening the materials into a first material, a second material and a third material; C. bulk preselection: and conveying the first material to an intelligent XRD separator I through a belt conveyor. The method for separating the magnetic minerals has the advantages of strong operability, remarkable tailing discarding effect and capability of greatly reducing the beneficiation cost of a beneficiation plant, and has wide application prospect in the beneficiation field of the magnetic minerals.
Description
Technical Field
The invention relates to the technical field of mineral separation, in particular to a high-efficiency method for full-size-fraction preselection of magnetic ores.
Background
The ore is used as non-renewable resources, the resources are gradually depleted along with the increase of the mining years, and 3-20% of surrounding rock is mixed in the mining process, so that the grinding and selecting grade of the ore is lower and lower, for example, the ore is directly connected into the grinding and selecting operation, the equipment processing capacity of the grinding and selecting operation is increased, the consumption of consumables in the grinding and selecting operation process is increased, the production and management cost is increased, the service life of a tailing pond is shortened due to the discharge of the selected fine tailings, the ore is pre-selected and thrown, the ore grade is enriched, the waste rock entering the ball milling and selecting stages is reduced as much as possible, and the method is the most direct and most effective mode for reducing the selecting cost, and is also the ore selecting principle of 'early loss' advocated in ore dressing.
At present, a strong magnetic pre-selection technology is mainly adopted for pre-selection of magnetic ores, and the strong magnetic pre-selection has good sorting effect on fine particle fraction, but has higher requirements on the dryness of materials and the thickness of a feeding layer, as the particle fraction of the materials increases, the inertia force of waste stones rotating along with a magnetic roller is larger than the attraction force of a magnetic field on the ores, and the effect of the strong magnetic separation is rapidly reduced, so that the pre-selection cannot be realized.
Disclosure of Invention
The invention aims to provide an efficient method for full-size-fraction pre-selection of magnetic ores, so as to solve the problems in the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions: an efficient method for full size fraction preselection of magnetic ores, the method comprising the steps of:
A. coarse crushing-sieving: coarse crushing raw ore by a jaw crusher, sieving the coarse crushed material by a bar screen, feeding the sieved raw ore into the jaw crusher for medium crushing, sieving the medium crushed material by a first linear vibrating screen, and merging the bar screen and the products sieved by the linear vibrating screen into the next operation;
B. and (3) screening and classifying: sequentially feeding the crushed materials into a second linear vibrating screen and a third linear vibrating screen, and screening the materials into a first material, a second material and a third material;
C. bulk preselection: conveying the first material to an intelligent XRD separator I through a belt conveyor for separation to obtain a first product and a first tailing;
D. preselection of middle blocks: conveying the second material to an intelligent XRD separator II through a belt conveyor for separation to obtain a second product and a second tailing;
E. finely crushing: after the product I and the product II are combined, feeding the product I and the product II into fine crushing equipment through a belt conveyor to carry out fine crushing operation, classifying the fine crushed materials through a fourth linear vibration sieve, returning the materials on the surface of the fourth linear vibration sieve to the fine crushing equipment, and combining the screened materials and the screened materials III into a product III to enter the next operation;
F. pulping-magnetic separation: adding water into the third product to prepare ore pulp with the mass concentration of 15-20%, carrying out coarse pre-magnetic separation on the ore pulp through a CTS type cylinder magnetic separator, scavenging the magnetic tailings by a large-particle vertical-ring pulsating high-gradient magnetic separator, combining the magnetic minerals of the coarse pre-magnetic separation and the magnetic tailings, enabling the tailings of the large-particle vertical-ring pulsating high-gradient magnetic separator to be tailings, concentrating the tailings, and dehydrating the tailings by a vibrating screen to obtain the sand aggregate.
Preferably, the screen mesh size of the bar screen in the step a is 80mm×80mm, and the screen mesh size of the first linear vibrating screen is 80mm×80mm.
Preferably, the screen size of the second linear vibration screen in the step B is 40mm×40mm, and the screen size of the third linear vibration screen is 5mm×5mm.
Preferably, the first material in the step B has a size of 40-80 mm, the second material has a size of 5-40 mm, and the third material has a size of 0-5 mm.
Preferably, the block preselection range in the step C is 40-80 mm, the block preselection range in the step D is 5-40 mm, and the screen mesh size of the fourth linear vibrating screen in the step E is 5mm×5mm.
Compared with the prior art, the invention has the following beneficial effects:
the invention performs primary preselection before fine crushing, embodies the ore dressing principle of 'lost early', reduces the ore entering amount of fine crushing operation, adopts a grading preselection method, namely, the materials are classified into two particle sizes before fine crushing for grading separation, avoids the phenomenon that the materials are pressed into small blocks in a large block in the separation process, ensures the intelligent separation effect, adopts the grading magnetic separation, namely, adopts a CTS permanent magnet drum type magnetic separator for rough separation to preselect the mechanically iron and the minerals with strong magnetism, adopts a large-particle vertical ring pulse high-gradient magnetic separator for scavenging, adopts the grading operation, and adopts the large-particle vertical ring pulse high-gradient magnetic separator as the preselection equipment with the particle size of 0-5 mm, so that the weak magnetic minerals can select different background magnetic fields, the strong magnetic minerals can select low background magnetic fields, and the adaptability to the minerals is stronger, the tailings (first tailings and second tailings and third tailings) generated in the process are subjected to scavenging operation, the two devices have the advantages of being applied to the large-scale ore dressing operation, the ore dressing process is greatly reduced, the ore dressing cost is greatly reduced, and the ore dressing cost is greatly reduced, the ore dressing cost is greatly reduced by the large-scale ore dressing operation of the ore dressing process is greatly, and the ore dressing process is greatly reduced.
Description of the embodiments
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, 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.
An efficient method for full size fraction preselection of magnetic ores, the method comprising the steps of:
A. coarse crushing-sieving: coarse crushing raw ore by a jaw crusher, sieving the coarse crushed material by a bar screen, feeding the sieved raw ore into the jaw crusher for medium crushing, sieving the medium crushed material by a first linear vibrating screen, and merging the bar screen and the products sieved by the linear vibrating screen into the next operation;
B. and (3) screening and classifying: sequentially feeding the crushed materials into a second linear vibrating screen and a third linear vibrating screen, and screening the materials into a first material, a second material and a third material;
C. bulk preselection: conveying the first material to an intelligent XRD separator I through a belt conveyor for separation to obtain a first product and a first tailing;
D. preselection of middle blocks: conveying the second material to an intelligent XRD separator II through a belt conveyor for separation to obtain a second product and a second tailing;
E. finely crushing: after the product I and the product II are combined, feeding the product I and the product II into fine crushing equipment through a belt conveyor to carry out fine crushing operation, classifying the fine crushed materials through a fourth linear vibration sieve, returning the materials on the surface of the fourth linear vibration sieve to the fine crushing equipment, and combining the screened materials and the screened materials III into a product III to enter the next operation;
F. pulping-magnetic separation: adding water into the third product to prepare ore pulp with the mass concentration of 15-20%, carrying out coarse pre-magnetic separation on the ore pulp through a CTS type cylinder magnetic separator, scavenging the magnetic tailings by a large-particle vertical-ring pulsating high-gradient magnetic separator, combining the magnetic minerals of the coarse pre-magnetic separation and the magnetic tailings, enabling the tailings of the large-particle vertical-ring pulsating high-gradient magnetic separator to be tailings, concentrating the tailings, and dehydrating the tailings by a vibrating screen to obtain the sand aggregate.
The screen mesh specification of the bar screen in the step A is 80mm multiplied by 80mm, the screen mesh specification of the first linear vibrating screen is 80mm multiplied by 80mm, the screen mesh specification of the second linear vibrating screen in the step B is 40mm multiplied by 40mm, the screen mesh specification of the third linear vibrating screen is 5mm multiplied by 5mm, the size of the first material in the step B is 40-80 mm, the size of the second material is 5-40 mm, the size of the third material is 0-5 mm, the bulk preselection range in the step C is 40-80 mm, the bulk preselection range in the step D is 5-40 mm, and the screen mesh specification of the fourth linear vibrating screen in the step E is 5mm multiplied by 5mm.
The comparison of the production indexes of the method and the traditional sorting method when treating certain hematite is shown in the following table:
| name of the name | Yield (%) | Compared with the prior art | Grade (%) | Compared with the prior art | Recovery (%) | Compared with the prior art |
| Raw ore | 100 | - | 27.68 | 27.68 | - | - |
| Preselection tail throwing | 31.59 | +31.59 | 6.37 | - | 7.27 | - |
| Grinding mineral | 68.41 | -31.59 | 37.52 | +9.84 | 92.73 | -0.09 |
According to the invention, under the condition of ensuring the metal recovery rate, the qualified tailings accounting for 31.59% of the total ore feeding can be discarded before the ore is subjected to grinding by adopting the method, the tailings can be sold as sand aggregate or directly backfilled on site, the pressure of a tailings warehouse is reduced, the grinding grade of the ore is improved by 9.84 percent, the subsequent grinding and the selected ore feeding amount are greatly reduced, and the selecting, the power consumption, the medicine consumption and the occupied area of subsequent equipment can be reduced, thereby greatly reducing the ore dressing cost of subsequent operation.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. An efficient method for full-size pre-selection of magnetic ores is characterized in that: the method comprises the following steps:
A. coarse crushing-sieving: coarse crushing raw ore by a jaw crusher, sieving the coarse crushed material by a bar screen, sieving the sieved raw ore by the jaw crusher, sieving the medium crushed material by a first linear vibrating screen, merging the bar screen and the product sieved by the linear vibrating screen into the next operation, wherein the screen size of the bar screen is 80mm multiplied by 80mm, and the screen size of the first linear vibrating screen is 80mm multiplied by 80mm;
B. and (3) screening and classifying: sequentially feeding the crushed materials into a second linear vibrating screen and a third linear vibrating screen, and screening the materials into a first material, a second material and a third material, wherein the screen mesh of the second linear vibrating screen is 40mm multiplied by 40mm, the screen mesh of the third linear vibrating screen is 5mm multiplied by 5mm, the size of the first material is 40-80 mm, the size of the second material is 5-40 mm, and the size of the third material is 0-5 mm;
C. bulk preselection: conveying the first material to an intelligent XRD separator I through a belt conveyor for separation to obtain a first product and a first tailing, wherein the large pre-selection range is 40-80 mm;
D. preselection of middle blocks: conveying the second material to an intelligent XRD separator II through a belt conveyor for separation to obtain a second product and a second tailing, wherein the preselection range of the middle block is 5-40 mm;
E. finely crushing: after the product I and the product II are combined, feeding the product I and the product II into fine crushing equipment through a belt conveyor to carry out fine crushing operation, classifying the fine crushed materials through a fourth linear vibrating screen, returning the materials on the surface of the fourth linear vibrating screen to the fine crushing equipment, and combining the screened materials and the materials III into a product III to enter the next operation, wherein the screen mesh specification of the fourth linear vibrating screen is 5mm multiplied by 5mm;
F. pulping-magnetic separation: adding water into the third product to prepare ore pulp with the mass concentration of 15-20%, carrying out coarse pre-magnetic separation on the ore pulp through a CTS type cylinder magnetic separator, scavenging the magnetic tailings by a large-particle vertical-ring pulsating high-gradient magnetic separator, combining the magnetic minerals of the coarse pre-magnetic separation and the magnetic tailings, enabling the tailings of the large-particle vertical-ring pulsating high-gradient magnetic separator to be tailings, concentrating the tailings, and dehydrating the tailings by a vibrating screen to obtain the sand aggregate.
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