CN113102080A - Two-stage series high-pressure roller grinding-stirring grinding short-flow crushing grinding system and method thereof - Google Patents
Two-stage series high-pressure roller grinding-stirring grinding short-flow crushing grinding system and method thereof Download PDFInfo
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- CN113102080A CN113102080A CN202110423566.5A CN202110423566A CN113102080A CN 113102080 A CN113102080 A CN 113102080A CN 202110423566 A CN202110423566 A CN 202110423566A CN 113102080 A CN113102080 A CN 113102080A
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- 238000003756 stirring Methods 0.000 title claims abstract description 101
- 238000000227 grinding Methods 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 47
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 63
- 239000011707 mineral Substances 0.000 claims abstract description 63
- 239000000463 material Substances 0.000 claims abstract description 51
- 238000010494 dissociation reaction Methods 0.000 claims abstract description 16
- 230000005593 dissociations Effects 0.000 claims abstract description 16
- 239000004576 sand Substances 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 15
- 239000000178 monomer Substances 0.000 claims description 13
- 239000000919 ceramic Substances 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000001238 wet grinding Methods 0.000 claims description 2
- 238000010298 pulverizing process Methods 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 13
- 230000008901 benefit Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 7
- 238000012545 processing Methods 0.000 abstract description 4
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
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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
- 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
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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
Abstract
A two-section series high-pressure roller grinding-stirring grinding short-flow crushing grinding system and a method thereof belong to the field of mineral processing. The first-section high-pressure roller mill of the two-section series high-pressure roller mill-stirring mill short-flow crushing mill system is communicated with the first-section vibrating screen, the undersize material outlet of the first-section vibrating screen is communicated with the second-section high-pressure roller mill, the second-section high-pressure roller mill is communicated with the second-section vibrating screen, the undersize material outlet of the second-section vibrating screen is communicated with the stirring mill, and the stirring mill is connected with the grading equipment. The method comprises the steps of crushing the materials crushed and screened by the first-stage high-pressure roller mill by the second-stage high-pressure roller mill, and then grinding the materials by the stirring mill, so that the ball milling operation with high energy consumption and low ore grinding efficiency in the traditional process is cancelled, and the energy-saving advantages of the high-pressure roller mill and the stirring mill are fully exerted. The method can simplify the crushing and grinding process, greatly improve the crushing efficiency and the treatment capacity, strengthen the dissociation effect of stirring, grinding and ore grinding, improve the economic benefit of enterprises and contribute to the large-scale industrial operation of the high-pressure roller mill.
Description
Technical Field
The invention belongs to the technical field of mineral processing, and particularly relates to a two-stage series high-pressure roller mill-stirring mill short-flow crushing mill system and a method thereof.
Background
The crushing and grinding operation is a preparation operation before sorting, and the task is to provide a selected material with qualified granularity for the mineral separation operation, and the judgment standard of the qualified granularity of the selected material is that useful minerals in ores need to be fully dissociated by monomers and are crushed and slightly as possible, so that the subsequent sorting operation is facilitated. The ore crushing and grinding is the operation with the highest energy consumption in the process of processing and utilizing mineral resources, and particularly when the ultrafine grinding operation is carried out, the energy consumption of the traditional horizontal ball mill increases exponentially as the granularity of the product becomes smaller. The characteristics of poor, fine and miscellaneous mineral resources in China are gradually shown, the granularity of crushed products is reduced, more crushing and less grinding are realized, the energy utilization rate of ore grinding equipment is improved, and the method is the key for reducing the energy consumption of crushing and grinding operation. In the development of grinding equipment for decades, high-pressure roller mills and stirring mills have made breakthrough progress, are concerned about due to the high-efficiency and energy-saving grinding effect, and are gradually accepted and popularized at home and abroad.
At present, high-pressure roller mills and stirring mills in metal mines are applied to superfine grinding and regrinding processes frequently, and show good energy-saving effect. However, in each process, the proportion of the operation borne by the two devices is small, and the two devices and the common horizontal ball mill with low energy utilization rate form a crushing and grinding flow, so that the energy utilization rate of a crushing and grinding system is still low, and the energy-saving effect is limited. For example, the invention CN 102085491A provides a four-section crushing and twice-screening high-pressure roller mill crushing process, raw ores are subjected to coarse crushing and intermediate crushing and then screened, products on a screen are subjected to fine crushing, and products under the screen are subjected to high-pressure roller milling. The process reduces the crushing energy consumption to a certain extent and improves the production capacity of the mill. But has the disadvantages of complex flow and unstable index of the crushed product. Therefore, it is urgently needed to develop a grinding operation device with short flow, low energy consumption and high dissociation degree of the product and a new grinding method thereof.
Disclosure of Invention
The invention provides a two-stage series high-pressure roller grinding-stirring grinding short-flow grinding system and a method thereof, aiming at the problems of the traditional grinding operation equipment and method. The characteristics of two devices of the high-pressure roller mill and the stirring mill are combined, the two sections of high-pressure roller mills are adopted to carry out superfine grinding on ores, the stirring mill is adopted to carry out ore milling operation, the ball milling operation with high energy consumption and low ore milling efficiency in the traditional process is cancelled, and the energy-saving advantages of the high-pressure roller mill and the stirring mill are fully exerted. The application of the technology can simplify the crushing and grinding process, greatly improve the crushing efficiency and the treatment capacity, strengthen the ore dissociation effect of stirring grinding, and have important practical significance for improving the economic benefit of enterprises and the large-scale industrialized popularization and application of high-pressure roller mills.
The invention relates to a two-section series high-pressure roller mill-stirring mill short-flow crushing mill system, which comprises a first-section high-pressure roller mill, a first-section vibrating screen and a second-section high-pressure roller mill, the material outlet of the first-section high-pressure roller mill is communicated with the material inlet of the first-section high-pressure roller mill, the material outlet of the second-section high-pressure roller mill is communicated with the material inlet of the second-section high-pressure roller mill, the material outlet of the second-section high-pressure roller mill is communicated with the material outlet of the second-section high-pressure roller mill, the material outlet of the second-section vibrating screen is communicated with the material inlet of the stirring mill, the stirring mill is connected with the grading equipment, the grading equipment is provided with an overflow outlet and a settled sand outlet; wherein, the first section of high-pressure roller mill is provided with a mineral inlet, and an overflow outlet of the grading equipment is a crushed product outlet.
Further, the following of the high-pressure roller mill of the first section: the radius of the roller is 80-120 mm, and the width of the gap between the two rollers is 5-7 mm.
Further, the two-stage high-pressure roller mill comprises: the radius of the roller is 80-120 mm, and the width of the gap between the two rollers is 2-4 mm.
Further, the grading equipment is a spiral classifier or a hydrocyclone.
The invention relates to a two-section series high-pressure roller grinding-stirring grinding short-flow crushing grinding method, which comprises the following steps:
(1) adding the finely-crushed minerals into a first-stage high-pressure roller mill for first-stage crushing, screening the crushed products in a first-stage vibrating screen, and returning the oversize materials of the first-stage vibrating screen to the first-stage high-pressure roller mill for continuous crushing;
(2) feeding the undersize material of the first-stage vibrating screen into a second-stage high-pressure roller mill for crushing, feeding the crushed product into a second-stage vibrating screen for screening, and feeding the oversize material of the second-stage vibrating screen back to the second-stage high-pressure roller mill for continuous crushing;
(3) adding undersize materials, stirring mill media and water of the second-stage vibrating screen into a stirring mill, and performing ore grinding operation to obtain ore grinding ore pulp;
(4) and carrying out grading operation on the ore grinding pulp by adopting grading equipment to obtain an overflow product and a sand setting product, wherein the overflow product is a crushed grinding product.
In the step (1), the fine crushed mineral is obtained by coarse crushing, medium crushing and fine crushing of the ore, and the particle size of the fine crushed mineral is less than 12 mm.
In the step (1), the technological parameters of the first-stage high-pressure roller mill are as follows: the pressure of the roller is 15-20 MPa, and the rotating speed and linear speed of the pressing roller are 20-25 rpm.
In the step (1), the vibration frequency of the first section of vibrating screen is 15-20 Hz, and the particle size of the screen is 4-6 mm.
In the step (2), the particle size of the undersize material of the first section of vibrating screen is at least less than 6 mm.
In the step (2), the process parameters of the two-stage high-pressure roller mill are as follows: the roller pressure is 10-15 MPa, and the linear speed of the roller is 10-20 rpm.
In the step (2), the vibration frequency of the two-section vibrating screen is 15-20 Hz, and the particle size of the screen is 1mm or 0.5 mm.
In the step (3), the undersize material of the second-stage vibrating screen is less than 1mm or less than 0.5 mm.
In the step (3), the stirring and grinding medium is preferably ceramic balls, and the material-ball ratio is as follows: (0.6-0.8): 1; the stirring grinding is wet grinding, and the mass percentage concentration of the minerals in the ore grinding pulp in the minerals and water is as follows: 50% -80%; the ore grinding time of the stirring mill is 3-5 min; the volume filling rate of the stirring mill is 60-90 percent; the linear speed of the edge of the stirring and grinding is 3-6 m/s.
In the step (4), the overflow product enters the next procedure for sorting operation; and returning the settled sand product to the stirring mill for ore grinding operation.
In the method, the mass percentage concentration of the mineral substance of the overflow product of the hydrocyclone is 20 percent to 40 percent, and the mass percentage concentration of the mineral substance in the sand setting product is 60 percent to 80 percent.
By adopting the two-stage series high-pressure roller grinding-stirring grinding short-flow crushing grinding method, the monomer dissociation degree of minerals in the obtained overflow product is 65-85%, and the relative grindability is 1.3-1.5.
According to the two-section series high-pressure roller mill-stirring mill short-flow crushing mill system and the method thereof, the internal microcrack density of the ore can be remarkably increased through the high-pressure roller mill lamination crushing, the subsequent stirring mill can further improve the monomer dissociation degree of the ore grinding product, the energy consumption is saved by more than 50%, and the basic principle is as follows:
the high-pressure roller mill has the advantages of low unit energy consumption, large processing capacity, uniform crushed products, small occupied area and the like, and gradually becomes the development trend of a multi-crushing and multi-grinding technology. The high-pressure roller mill performs quasi-static pressure layer crushing, and the particles can be used as pressure transmission media. When the material layer is extruded, the particles are crushed or deformed due to the huge pressure generated by mutual extrusion of the particles, and the selective crushing effect is obvious. Compared with a ball mill, the stirring mill has the remarkable characteristics and advantages of high energy efficiency, medium saving, low carbon, environmental protection, simple installation, maintenance and operation and the like. Industrial production practices have shown that a stirred mill can save significant energy compared to a conventional ball mill, with the finer the product particle size, the more efficient the stirred mill is compared to a ball mill. The energy utilization efficiency of the stirring mill is higher due to the grinding effect, the vertical arrangement and the better medium particle size distribution. In the field of fine grinding, compared with the traditional ball mill, the stirring mill can save the energy consumption by more than 30 percent, and the medium consumption is reduced by 50 percent.
The invention relates to a two-section series high-pressure roller mill-stirring mill short-flow crushing mill system and a method thereof. After the first-stage high-pressure roller grinding product is screened, the product on the screen returns to continue to be ground, the product under the screen is fed into a second-stage high-pressure roller to be ground, and the second-stage high-pressure roller product is qualified stirring mill feeding. Based on the high-pressure roller grinding lamination crushing theory, more microcracks are formed in the ore grain boundary, the ore strength is weakened, and the relative grindability of the ore is improved. After the high-pressure roller grinding product is subjected to stirring grinding, grading operation is carried out through a hydrocyclone or a spiral classifier, and the settled sand or underflow product returns to the stirring grinding through the spiral classifier to be subjected to grinding operation.
Compared with the prior art, the invention has the advantages that: (1) the conventional crushing technology has complex flow, high energy consumption and high production cost, and the invention adopts a two-section series high-pressure roller mill-stirring mill short-flow ore grinding technology, so that the dissociation degree of the crushed product is high and the crushing flow is simplified; (2) based on the technical principle of high-pressure roller milling lamination crushing, microcracks in the crushed product are fully developed, so that the relative grindability of ores and the monomer dissociation degree are respectively improved by 15-20% and 25-30%, the ore grinding efficiency is improved, and the ore grinding energy consumption and medium consumption are obviously reduced.
Drawings
Fig. 1 is a schematic structural diagram of a two-stage series high-pressure roller mill-agitator mill short-flow ore grinding system in example 1.
Fig. 2 is a schematic process flow diagram of a two-stage series high-pressure roller mill-agitator mill short-flow ore grinding method in example 1.
In the above figures, 1 is a first-stage high-pressure roller mill, 2 is a first-stage vibrating screen, 3 is a second-stage high-pressure roller mill, 4 is a second-stage vibrating screen, 5 is a stirring mill, and 6 is a grading device;
a is a finely-divided mineral, b is a crushed product, c is an oversize material of a first-stage vibrating screen, d is an undersize material of the first-stage vibrating screen, e is a crushed product, f is an oversize material of a second-stage vibrating screen, g is an undersize material of the second-stage vibrating screen, h is a stirring and grinding medium, i is an overflow product, and j is settled sand.
Detailed Description
The present invention is described in further detail below with reference to process flow diagrams and examples, which are set forth to aid in the understanding of the present invention and should not be construed as specifically limiting the invention.
Example 1
A two-section series high-pressure roller mill-stirring mill short-flow crushing mill system is shown in a schematic structural diagram of the system in figure 1 and comprises a first-section high-pressure roller mill 1, a first-section vibrating screen 2, a second-section high-pressure roller mill 3, a second-section vibrating screen 4, a stirring mill 5 and a grading device 6 (the grading device in the embodiment is a hydrocyclone), wherein a material outlet of the first-section high-pressure roller mill 1 is communicated with the first-section vibrating screen 2, an oversize material outlet of the first-section vibrating screen 2 is communicated with an oversize material inlet of the first-section high-pressure roller mill 1, an undersize material outlet of the first-section vibrating screen 2 is communicated with a material inlet of the second-section high-pressure roller mill 3, a material outlet of the second-section high-pressure roller mill 3 is communicated with the second-section vibrating screen 4, an oversize material outlet of the second-section vibrating screen 4 is communicated with a, the stirring mill 5 is connected with the grading equipment 6, the grading equipment 6 is provided with an overflow outlet and a settled sand outlet, and the settled sand outlet is communicated with a material inlet of the stirring mill; wherein, the first section of high pressure roller mill 1 is provided with a mineral inlet, and an overflow outlet of the grading equipment 6 is a crushed product outlet.
In this example, the roller radius of the single-stage high-pressure roller mill 1 was 125mm, and the gap width between the two rollers was 7 mm. The roller radius of the two-stage high-pressure roller mill 3 is 125mm, and the gap width between the two rollers is 4 mm.
The two-section series high-pressure roller grinding-stirring grinding short-flow crushing grinding method is implemented by adopting the two-section series high-pressure roller grinding-stirring grinding short-flow crushing grinding system, the flow schematic diagram is shown in figure 2, and the method comprises the following steps:
the finely-divided mineral a is an iron ore sample with the granularity of-12 mm;
feeding the fine crushed mineral a into a first-section high-pressure roller mill for crushing, wherein the roller pressure of the first-section high-pressure roller mill is 15MPa, the rotational speed and the linear speed of a pressing roller are 20rpm, a crushed product b passes through a 5mm first-section vibrating screen, the vibration frequency is 18Hz, an oversize material c of the first-section vibrating screen returns to the first-section high-pressure roller mill for continuous crushing, and an undersize material d of the first-section vibrating screen is fed into a second-section high-pressure roller mill for crushing; the roller pressure of the two-section high-pressure roller mill is 10MPa, the rotating speed and linear speed of the pressing roller are 10rpm, a crushed product e of the two-section high-pressure roller mill is screened by a 1mm two-section vibrating screen, the vibration frequency is 18Hz, an oversize material f of the two-section vibrating screen returns to the two-section high-pressure roller mill to be continuously crushed, and an undersize material g of the two-section vibrating screen is ceramic medium stirring mill feeding.
In the process of stirring and grinding the two-section high-pressure roller grinding product, the mass concentration of the stirring and grinding ore is 50%, the volume filling rate of the stirring and grinding is 80%, the material-ball ratio is 0.8, the added stirring and grinding medium h is a ceramic ball with the diameter of 4mm, the stirring and grinding edge linear speed is 3m/s, and the ore grinding time is 5 min. After classifying the stirred mill grinding product by a hydrocyclone, the mass percentage concentration of minerals in the overflow product i is 30%, and the mass percentage concentration of minerals in the sand setting j is 70%. And (3) conveying the settled sand product into the stirring mill again for ore milling operation, wherein the mineral content of-0.074 mm in the overflow product accounts for 80% of the total mineral mass, the relative grindability of the minerals in the overflow product is 1.43, and the monomer dissociation degree is 67.03%.
Example 2
The two-stage series high-pressure roller mill-stirring mill short-flow crushing system in the embodiment 1 is adopted, and the two-stage series high-pressure roller mill-stirring mill short-flow crushing method is the same as that in the embodiment 1, and is different in that:
(1) a copper ore sample with a fine crushed mineral particle size of-12 mm; the size of a screen hole of the first section of the vibrating screen is 5mm, the mass concentration of the stirring mill grinding is 60%, the volume filling rate of the stirring mill is 70%, the material-ball ratio is 0.7, the diameter of the ceramic ball is 6mm, and the grinding time is 3 min.
(2) After the stirring mill grinding product is graded by a hydrocyclone, the mass percentage concentration of the minerals in the overflow product is 35%, and the mass percentage concentration of the minerals in the settled sand is 65%. And (3) conveying the settled sand product into the stirring mill again for ore milling operation, wherein the mineral content of-0.074 mm in the overflow product accounts for 85% of the total mineral mass, the relative grindability of the minerals in the overflow product is 1.40, and the monomer dissociation degree is 70.84%.
Example 3
The two-stage series high-pressure roller mill-stirring mill short-flow crushing system in the embodiment 1 is adopted, and the two-stage series high-pressure roller mill-stirring mill short-flow crushing method is the same as that in the embodiment 1, and is different in that:
(1) a gold ore sample with a fine crushed mineral particle size of-12 mm; the size of a screen hole of the first section of the vibrating screen is 4mm, the mass concentration of the stirring mill grinding ore is 70%, the volume filling rate of the stirring mill is 75%, the material-ball ratio is 0.85, the diameter of the ceramic ball is 10mm, and the ore grinding time is 4.5 min.
(2) After the stirring mill grinding product is graded by a hydrocyclone, the mass percentage concentration of the minerals in the overflow product is 38%, and the mass percentage concentration of the minerals in the settled sand is 62%. And (3) conveying the settled sand product into the stirring mill again for ore milling operation, wherein the mineral content of-0.045 mm in the overflow product accounts for 80% of the total mineral mass, the relative grindability of the minerals in the overflow product is 1.35, and the monomer dissociation degree is 76.32%.
Example 4
The two-stage series high-pressure roller mill-stirring mill short-flow crushing system in the embodiment 1 is adopted, and the two-stage series high-pressure roller mill-stirring mill short-flow crushing method is the same as that in the embodiment 1, and is different in that:
(1) a magnesite sample with a fine crushed mineral granularity of-12 mm; the size of a screen hole of the first section of vibrating screen is 4mm, the mass concentration of the stirring mill grinding is 65%, the volume filling rate of the stirring mill is 85%, the material-ball ratio is 0.75, the diameter of the ceramic ball is 9mm, and the grinding time is 3.5 min.
(2) After the stirring mill grinding product is graded by a hydrocyclone, the mass percentage concentration of the minerals in the overflow product is 33%, and the mass percentage concentration of the minerals in the settled sand is 67%. And (3) conveying the settled sand product into the stirring mill again for ore milling operation, wherein the mineral content of-0.074 mm in the overflow product accounts for 75% of the total mineral mass, the relative grindability of the minerals in the overflow product is 1.45, and the monomer dissociation degree is 64.39%.
Example 5
A two-stage series high-pressure roller mill-stirring mill short-flow crushing mill system, which is the same as the embodiment 1, and is different from the embodiment in that the grading device 6 is a spiral classifier.
A two-stage series high-pressure roller mill-stirring mill short-flow crushing mill method adopts the two-stage series high-pressure roller mill-stirring mill short-flow crushing mill system of the embodiment, and the method is the same as that of embodiment 1.
Comparative example 1
Compared with the embodiment 1, the two-section ball milling-stirring milling system is adopted, the ball mill is adopted to replace a high-pressure roller mill, the mineral content of 0.074mm accounts for 95% of the total mineral mass, but the energy consumption is 5-10 times that of the two-section high-pressure roller mill-stirring milling system.
Comparative example 2
Compared with the system in example 1, the system adopts the one-section high-pressure roller mill and the stirring mill, only one-section high-pressure roller mill, the mineral content of-0.074 mm in the overflow product accounts for 45 percent of the total mineral mass, the relative grindability of the mineral in the overflow product is 1.28, and the monomer dissociation degree is 50.74 percent.
Comparative example 3
Compared with the system in example 1, the system of the two-stage high-pressure roller grinding mill in series connection is adopted, no stirring mill is adopted, the content of minerals with the particle size of-0.074 mm in the ground product accounts for 25% of the total mineral mass, the relative grindability of the minerals in the overflow product is 1.25, and the monomer dissociation degree is 45.23%.
Comparative example 4
Compared with the embodiment 1, the two-stage series high-pressure roller grinding-ball grinding system is adopted, the ball grinding is adopted to replace stirring grinding, the mineral content of 0.074mm accounts for 70% of the total mineral mass, in an overflow product, the relative grindability of the mineral is 1.23, and the monomer dissociation degree is 58.62%, compared with the comparative examples 1-4 and the embodiment 1, the relative grindability of the mineral and the monomer dissociation degree of the embodiment 1 are respectively improved by 10-20% and 15-35%.
Claims (10)
1. A two-section series high-pressure roller mill-stirring mill short-flow crushing mill system is characterized by comprising a one-section high-pressure roller mill, a one-section vibrating screen, a two-section high-pressure roller mill, a two-section vibrating screen, a stirring mill and a grading device, wherein a material outlet of the one-section high-pressure roller mill is communicated with the one-section vibrating screen, an oversize material outlet of the one-section vibrating screen is communicated with an oversize material inlet of the one-section high-pressure roller mill, a undersize material outlet of the one-section vibrating screen is communicated with a material inlet of the two-section high-pressure roller mill, a material outlet of the two-section high-pressure roller mill is communicated with the two-section vibrating screen, an oversize material outlet of the two-section vibrating screen is communicated with an oversize material inlet of the two-section high-pressure roller mill, the stirring mill is connected with the grading device, the grading device is provided with an overflow outlet and a sand settling outlet, the sand setting outlet is communicated with the material inlet of the stirring mill; wherein, the first section of high-pressure roller mill is provided with a mineral inlet, and an overflow outlet of the grading equipment is a crushed product outlet.
2. The two-stage series high-pressure roller mill-stirring mill short-flow crushing mill system according to claim 1, characterized in that the roller radius of the one-stage high-pressure roller mill is 80-120 mm, and the gap width between two rollers is 5-7 mm; the roller radius of the two-section high-pressure roller mill is 80-120 mm, and the gap width between the two rollers is 2-4 mm.
3. The two-stage high-pressure roller mill-agitator mill short-flow pulverizing mill system according to claim 1, characterized in that the classifying device is a spiral classifier or a hydrocyclone.
4. A two-stage series high-pressure roller mill-stirring mill short-flow crushing mill method is characterized in that the two-stage series high-pressure roller mill-stirring mill short-flow crushing mill system of any one of claims 1 to 3 is adopted, and the method comprises the following steps:
(1) adding the finely-crushed minerals into a first-stage high-pressure roller mill for first-stage crushing, screening the crushed products in a first-stage vibrating screen, and returning the oversize materials of the first-stage vibrating screen to the first-stage high-pressure roller mill for continuous crushing;
(2) feeding the undersize material of the first-stage vibrating screen into a second-stage high-pressure roller mill for crushing, feeding the crushed product into a second-stage vibrating screen for screening, and feeding the oversize material of the second-stage vibrating screen back to the second-stage high-pressure roller mill for continuous crushing;
(3) adding undersize materials, stirring mill media and water of the second-stage vibrating screen into a stirring mill, and performing ore grinding operation to obtain ore grinding ore pulp;
(4) and carrying out grading operation on the ore grinding pulp by adopting grading equipment to obtain an overflow product and a sand setting product, wherein the overflow product is a crushed grinding product.
5. The two-stage series high-pressure roller mill-stirring mill short-flow crushing and grinding method according to claim 4, characterized in that in the step (1), the finely-divided mineral is obtained by coarsely crushing, intermediately crushing and finely crushing the ore, and the particle size of the finely-divided mineral is less than 12 mm.
6. The two-stage series high-pressure roller mill-stirring mill short-flow crushing mill method according to claim 4, characterized in that in the step (1), the process parameters of the one-stage high-pressure roller mill are as follows: the roller pressure is 15-20 MPa, and the rotational speed and linear speed of the pressing roller are 20-25 rpm; the vibration frequency of the first section of vibration sieve is 15-20 Hz, and the particle size of the sieve is 4-6 mm.
7. The two-stage series high-pressure roller mill-stirring mill short-flow crushing mill method according to claim 4, characterized in that in the step (2), the process parameters of the two-stage high-pressure roller mill are as follows: the roller pressure is 10-15 MPa, and the linear speed of the roller is 10-20 rpm; the vibration frequency of the two-section vibrating screen is 15-20 Hz, and the particle size of the screen is 1mm or 0.5 mm.
8. The two-stage series high-pressure roller mill-stirring mill short-flow crushing mill method according to claim 4, characterized in that in the step (3), the stirring mill medium is ceramic balls, and the ratio of the material to the ball is as follows: (0.6-0.8): 1; the stirring grinding is wet grinding, and the mass percentage concentration of the minerals in the ore grinding pulp in the minerals and water is as follows: 50% -80%; the ore grinding time of the stirring mill is 3-5 min; the volume filling rate of the stirring mill is 60-90 percent; the linear speed of the edge of the stirring and grinding is 3-6 m/s.
9. The two-stage series high-pressure roller mill-stirring mill short-flow crushing mill method according to claim 4, characterized in that the mass percentage concentration of minerals in the overflow product of the hydrocyclone is 20% -40%, and the mass percentage concentration of minerals in the settled sand product is 60% -80%.
10. The two-stage series high-pressure roller mill-stirring mill short-flow crushing mill method according to claim 4, characterized in that the monomer dissociation degree of minerals in the obtained overflow product is 65-85%, and the relative grindability is 1.3-1.5.
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