CN114405663A - Wet easily-argillized power coal wide-size-fraction selected coal slime non-quantitative process - Google Patents
Wet easily-argillized power coal wide-size-fraction selected coal slime non-quantitative process Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 385
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000000843 powder Substances 0.000 claims abstract description 87
- 238000001035 drying Methods 0.000 claims abstract description 65
- 230000018044 dehydration Effects 0.000 claims abstract description 42
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 42
- 238000002156 mixing Methods 0.000 claims abstract description 23
- 238000012216 screening Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000003250 coal slurry Substances 0.000 claims abstract description 13
- 238000000926 separation method Methods 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 239000000047 product Substances 0.000 claims description 96
- 208000005156 Dehydration Diseases 0.000 claims description 41
- 239000010410 layer Substances 0.000 claims description 35
- 239000000463 material Substances 0.000 claims description 33
- 238000013139 quantization Methods 0.000 claims description 15
- 239000002562 thickening agent Substances 0.000 claims description 14
- 239000006148 magnetic separator Substances 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 6
- 239000002356 single layer Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 239000012141 concentrate Substances 0.000 claims description 4
- 239000000706 filtrate Substances 0.000 claims description 4
- 238000007885 magnetic separation Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 238000004062 sedimentation Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims 2
- 238000002360 preparation method Methods 0.000 abstract description 10
- 230000008901 benefit Effects 0.000 abstract description 7
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 2
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- 238000010586 diagram Methods 0.000 description 6
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- 230000001404 mediated effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/005—General arrangement of separating plant, e.g. flow sheets specially adapted for coal
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- 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
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
Abstract
The invention belongs to the technical field of power coal separation and coal slime non-quantification, and discloses a coal slime non-quantification process for wide-size grading selection of wet easily-argillized power coal. The invention comprises the following steps: the system comprises a coal flow direction, and is characterized in that six modules, namely a raw coal screening and crushing module, a raw coal deep powder removing module, a raw coal sorting module, a coal slime dehydration module, a drying module and a blending module, are sequentially arranged along the coal flow direction. The method can effectively realize the wide-size classification and the dry deep powder removal of the raw coal, reduce the lower limit of the classification, improve the raw coal dressing rate and the clean coal yield, and reduce the load of a coal slurry water system of a coal preparation plant. The coal slime is mixed, distributed and sold, so that the problems of difficult sale and environmental pollution of the coal slime are solved, the added value of a coal slime product is improved, the non-quantitative production of the coal slime of a coal preparation plant and the maximization of social, environmental and economic benefits are realized, and the realization of a double-carbon target is facilitated.
Description
Technical Field
The invention belongs to the technical field of power coal separation and coal slime non-quantization, and particularly relates to a coal slime non-quantization process for wide-size grading selection of wet easily-argillized power coal.
Background
At present, the problems of low raw coal flotation rate, high lower separation limit, narrow flotation size fraction and the like generally exist in the field of power coal separation in China, and meanwhile, the coal slime of a power coal separation plant is high in water content, low in calorific value, low in coal slime selling price, difficult to sell and easy to cause environmental pollution. The wet method powder removal is adopted in most power coal preparation plants, the particle size of the powder removal is high, and particularly when the moisture content of the selected raw coal is high and the selected raw coal is easy to argillize, the wet method powder removal easily causes the load of a coal slime water system of the coal preparation plant to be large and influences the separation precision of a separation system, and the economic benefit of the coal preparation plant is seriously influenced.
Disclosure of Invention
The invention provides a non-quantization process for coal slime selected by wet easily-argillized power coal wide-size fractions to make up the defects of the prior art. The method adopts 100 (or 80) mm classification of raw coal, 100 (or 80) mm crushing and 2 (or 1) mm dry-method deep powder removal, and 1-100 mm wide-size-fraction raw coal is selected, so that the raw coal selection rate and the selection precision are improved, the selection lower limit and the load of a slime water system are reduced, and the clean coal yield is improved. Meanwhile, the <2 (or 1) mm fine coal, the coarse coal slime and the fine coal slime are dried and then mixed with clean coal products for sale or directly serve as the fine coal for sale, so that the problems of high water generation, low heat productivity and difficulty in sale of the coal slime are solved, the added value of the coal slime products is improved, the non-quantitative production of the coal slime of a coal preparation plant and the maximization of social, environmental and economic benefits are realized, and the realization of a double-carbon target is facilitated.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a wet easy argillization power coal wide size fraction coal slime non-quantization technology of entering is selected, sets gradually six modules of raw coal screening and crushing module, raw coal degree of depth desliming module, raw coal sorting module, coal slime dehydration module, drying module, blending module along the coal stream trend, and specific process flow is as follows:
raw coal screening and crushing module: raw coal is classified by a raw coal classifying screen, materials larger than the size of a screen hole become oversize materials, materials smaller than the size of the screen hole become undersize materials, the oversize materials enter a crusher to be crushed, and crushed products and undersize materials of the raw coal classifying screen enter a raw coal deep powder removing module.
A raw coal deep powder removing module: firstly, enabling crushed products obtained by a raw coal screening and crushing module and undersize of a raw coal classifying screen to enter a primary desliming screen for desliming, wherein the undersize of the primary desliming screen is pulverized coal and enters a drying module or is directly sold; oversize products of the primary powder removing sieve enter a secondary powder removing sieve for secondary powder removing, undersize products of the secondary powder removing sieve enter a drying module or are directly sold, and oversize products of the secondary powder removing sieve enter a raw coal sorting module.
Raw coal sorting module: the oversize product of the secondary powder removing sieve obtained by the raw coal deep powder removing module enters raw coal sorting equipment for sorting, the light product obtained by sorting enters a clean coal medium removing sieve for dehydration and medium removal, the oversize product of the clean coal medium removing sieve enters a clean coal centrifuge for dehydration, the dehydrated product is a clean coal product, and the centrifugate enters a coal slime dehydration module; the heavy product obtained by sorting enters a gangue medium removing sieve for dehydration and medium removal, and the oversize product of the gangue medium removing sieve obtains a gangue product; undersize dilute media of the clean coal medium removing sieve and the gangue medium removing sieve enter a magnetic separator for medium recovery, and undersize qualified media of the clean coal medium removing sieve and the gangue medium removing sieve enter a qualified medium barrel; magnetic concentrate of the magnetic separator enters the qualified medium barrel, and magnetic tailings enter the coal slime dehydration module.
Coal slime dehydration module: the centrifugal liquid and the magnetic separation tailings from the raw coal sorting module enter a hydrocyclone for concentration and classification, the underflow part of the hydrocyclone enters a high-frequency sieve or an arc sieve for primary dehydration, oversize products enter a coal slime centrifuge for secondary dehydration to obtain coarse coal slime, and the coarse coal slime enters a drying module for drying; the overflow part of the hydrocyclone, undersize of the high-frequency sieve or the sieve bend and the centrifugate of the coal slime centrifuge enter a thickener for sedimentation, the underflow of the thickener enters a filter press for filter pressing and dehydration to obtain fine coal slime, and the fine coal slime enters a drying module for drying; the overflow of the thickener and the filtrate of the filter press are used as circulating water for repeated use in the production process.
A drying module: fine coal from a raw coal deep powder removing module, coarse coal slime and fine coal slime from a coal slime dewatering module enter a drying module for drying, and a dried product enters a blending module;
blending a module: the material from the drying module is transported by belt, blended into clean coal products, or sold directly as pulverized coal.
Preferably, the raw coal classifying screen in the raw coal screening and crushing module uses a single-layer screen surface or a double-layer screen surface;
when the raw coal classifying screen is a single-layer screen surface, the screen surface is a rigid screen surface or a rigid-flexible coupling elastic screen surface, and the size of the screen hole of the raw coal classifying screen can be selected from 100mm or 80 mm;
when the raw coal classifying screen is a double-layer screen surface, the upper layer screen surface is a rigid screen surface or a rigid-flexible coupling elastic screen surface, the lower layer screen surface is a relaxation screen surface, the size of the screen hole of the upper layer screen surface is 100mm or 80mm, and the size of the screen hole of the lower layer screen surface is 2mm or 1 mm.
The crusher is a double-toothed roller crusher or a grading crusher.
Preferably, in the raw coal screening and crushing module, when the raw coal classifying screen is a double-layer screen surface, the raw coal is classified by the raw coal classifying screen, the oversize material on the first layer of screen surface enters the crusher, and the undersize material enters the second layer of screen surface for fines removal; oversize products on the second layer of screen surface enter a raw coal deep powder removal module, undersize products are pulverized coal, and the undersize products enter a drying module or are directly sold; and returning the product of the crusher to a raw coal grading sieve for grading and removing the powder.
Preferably, in the raw coal deep powder removing module, the two powder removing modes are dry powder removing; the screen mesh size of the primary dry powder removing screen and the secondary dry powder removing screen is 2mm or 1 mm; the screen surfaces of the primary dry powder removing screen and the secondary dry powder removing screen are both flip screen surfaces.
Preferably, in the raw coal screening and crushing module and the raw coal deep powder removing module, when the raw coal classifying screen is a double-layer screen surface, the material entering the raw coal deep powder removing module is oversize material of the two-layer screen surface of the raw coal classifying screen.
Preferably, in the raw coal sorting module, the raw coal sorting equipment is a shallow slot dense medium sorting machine, and the raw coal of 1-100 mm wide size fraction is sorted by adopting the shallow slot dense medium sorting machine.
Preferably, in the coal slime dehydration module, a hydrocyclone is used for concentrating and grading coal slime water, and the grading granularity is 0.25 mm; the coarse coal slime is dewatered by a high-frequency sieve or a sieve bend and a coal slime centrifugal machine, and the fine coal slime is dewatered by a thickener and a filter press.
Preferably, in the drying module, the coarse coal slime, the fine coal slime and the pulverized coal are respectively dried, or the coarse coal slime and the pulverized coal are dried together, and the fine coal slime is independently dried.
Preferably, in the drying module, when the moisture content of the pulverized coal is low, the pulverized coal can be directly sold or blended as a product without being dried; the drying apparatus employed by the drying module is one of a rotary-wing dryer or a tumble dryer.
Preferably, in the blending module, coarse coal slime, fine coal slime and pulverized coal from the drying module are respectively transported by a belt and blended into a clean coal product; or the coarse coal slime and the fine coal slime are mixed into the pulverized coal for sale as the pulverized coal; or blending the fine coal slime into clean coal to be used as a clean coal product, and blending the coarse coal slime into pulverized coal to be used as a pulverized coal product.
Compared with the prior art, the invention has the following beneficial effects:
1) according to the invention, the relaxation sieve is adopted to perform 2 (or 1) mm dry-method powder removal on the raw coal twice, and the wide size fraction sorting is performed on 1-100 mm, so that the lower limit of the powder removal is reduced, the process flow is simplified, the lower limit of the raw coal sorting is reduced, the raw coal entering rate is improved, the load of a coal slurry water system of a coal preparation plant is reduced, and the economic benefit of the coal preparation plant is increased.
2) According to the invention, the coarse coal slime, the fine coal slime and the pulverized coal are respectively dried according to the coal quality condition, so that the drying process is optimized, the drying effect is improved, and the blending of the coal slime and the pulverized coal is facilitated.
3) The invention mixes the coal slime and the pulverized coal into the clean coal product for sale or directly uses the clean coal product for sale, solves the problems of high water generation, low heat productivity and difficult sale of the coal slime, improves the added value of the coal slime product, realizes the non-quantitative production of the coal slime of a coal preparation plant and the maximization of social, environmental and economic benefits, and is beneficial to the realization of double-carbon targets.
In conclusion, the wet easily-argillized coal slime non-quantization process for wide-size-fraction coal selection provided by the invention has the advantages that the classification of raw coal by 100 (or 80) mm, the crushing by >100 (or 80) mm and the deep powder removal by a dry method of 2 (or 1) mm are adopted, the wide-size-fraction selection of the raw coal by 1-100 mm is realized, the raw coal selection rate and the selection precision are improved, the selection lower limit and the coal slime water system load are reduced, and the clean coal yield is improved. Meanwhile, the <2 (or 1) mm fine coal, the coarse coal slime and the fine coal slime are dried and then mixed with clean coal products for sale or directly serve as the fine coal for sale, so that the problems of high water generation, low heat productivity and difficulty in sale of the coal slime are solved, the added value of the coal slime products is improved, the non-quantitative production of the coal slime of a coal preparation plant and the maximization of social, environmental and economic benefits are realized, and the realization of a double-carbon target is facilitated.
Drawings
FIG. 1 is a block diagram of a process flow of the present invention;
FIG. 2 is a flow diagram of a specific process of the present invention;
FIG. 3 is a flow diagram of a raw coal screening and crushing module, a-single layer screen mode, b-double layer screen mode;
FIG. 4 is a deep raw coal fines removal module, a-single layer screen mode, b-double layer screen mode;
FIG. 5 is a flow diagram of a raw coal sorting module;
FIG. 6 is a flow diagram of a coal slurry dewatering module; FIG. 7 is a flow diagram of a drying module;
FIG. 8 is a flow chart of a blending module.
Detailed Description
The invention will be further described with reference to examples and drawings, but the invention is not limited to the examples listed, and equivalent modifications and variations of the technical solution defined in the claims attached to the present application are intended to be included therein.
The invention relates to a wet easily-argillized power coal wide-size-fraction selected coal slime non-quantization process, which is divided into six modules along the coal flow direction as shown in figure 1: the system comprises a raw coal screening and crushing module, a raw coal deep powder removing module, a raw coal sorting module, a coal slime dehydration module, a drying module and a blending module.
The specific process flow is shown in figure 2, after raw coal is classified by a 100 (or 80) mm classifying screen, the raw coal with the size larger than 100 (or 80) mm on the screen enters a crusher to be crushed, and the raw coal with the size smaller than 100 (or 80) mm below the screen enters a raw coal deep powder removal module. The raw coal deep powder removing module carries out dry powder removing for 2 (or 1) mm twice on raw coal with the particle size of less than 100 (or 80) mm, oversize products of a primary powder removing sieve enter a secondary powder removing sieve, and undersize products enter a drying module or are directly sold as products; and oversize products of the secondary powder removing sieve enter a raw coal sorting module, and undersize products enter a drying module or are directly sold. The raw coal sorting module is used for sorting 1-100 mm raw coal by adopting a shallow slot heavy medium sorting machine, a heavy product is dehydrated and de-mediated by a gangue de-mediating sieve to form a gangue product, and a light product is dehydrated and de-mediated by a clean coal de-mediating sieve and a clean coal centrifuge to form a fine clean coal product; undersize dilute media of the clean coal medium removing sieve and the gangue medium removing sieve enter a magnetic separator for medium recovery, and undersize qualified media of the clean coal medium removing sieve and the gangue medium removing sieve enter a qualified medium barrel; magnetic concentrate of the magnetic separator enters the qualified medium barrel, and magnetic tailings and centrifugal liquid of the centrifugal machine enter the coal slime dehydration module. Concentrating and grading the magnetic separation tailings and the centrifugal liquid entering the coal slime dehydration module through a hydrocyclone, then enabling underflow of the hydrocyclone to enter a high-frequency sieve or an arc sieve for primary dehydration, enabling oversize products to enter a coal slime centrifugal machine for secondary dehydration, and enabling coarse coal slime dehydrated by the coal slime centrifugal machine to enter a drying module; the overflow of the cyclone, undersize of a high-frequency sieve or a sieve of a sieve bend and the centrifugate of the coal slime centrifugal machine enter a thickener for sedimentation, the underflow of the thickener enters a filter press for filter pressing and dehydration, and the dehydrated fine coal slime enters a drying module; the overflow of the thickener and the filtrate of the filter press are used as circulating water for repeated use in the production process. The material entering the drying module enters the blending module after being dried. In the blending module, the dried product is blended into a clean coal product or sold as pulverized coal according to the quality requirement of commercial coal.
More specific embodiments are as follows:
example 1
Raw coal screening and crushing module: as shown in fig. 3(a), raw coal is classified by 100mm through a raw coal classifying screen, materials larger than the size of the screen hole become oversize products, materials smaller than the size of the screen hole become undersize products, the oversize products enter a crusher to be crushed, and the crushed products and undersize products of the raw coal classifying screen enter a raw coal deep powder removing module. The screen surface of the raw coal classifying screen can be a rigid screen surface or a rigid-flexible coupling elastic screen surface, and the crusher can be a double-geared roller type crusher or a classifying crusher.
A raw coal deep powder removing module: as shown in fig. 4(a), the material entering the module is raw coal with a size of less than 100mm below the screen of the raw coal classifying screen, the raw coal with a size of less than 100mm firstly enters a primary dry powder removing screen for powder removal, and the undersize of the primary dry powder removing screen is pulverized coal which enters a drying module or is directly sold; oversize products of the primary dry-method powder removing sieve enter a secondary dry-method powder removing sieve for secondary powder removing, undersize products of the secondary dry-method powder removing sieve enter a drying module or are directly sold, and oversize products of the secondary powder removing sieve enter a raw coal sorting module. The size of the sieve pore of the primary dry powder removing sieve is selected to be 2mm, and the size of the sieve pore of the secondary powder removing sieve is selected to be 1 mm; the screen surfaces of the primary dry powder removing screen and the secondary powder removing screen are both flip screen surfaces.
Raw coal sorting module: as shown in fig. 5, the material entering the module is raw coal with a size of 1-100 mm on a screen of a secondary dry method powder removing screen, the raw coal with a size of 1-100 mm enters raw coal sorting equipment for sorting, a light product obtained by sorting enters a clean coal medium removing screen for dehydration and medium removal, a product on the screen enters a clean coal centrifuge for dehydration, the product after dehydration is a clean coal product, and a centrifugate enters a coal slime dehydration module; the heavy product obtained by sorting enters a gangue medium removing sieve for dehydration and medium removal, and the product on the sieve obtains a gangue product; undersize dilute media of the clean coal medium removing sieve and the gangue medium removing sieve enter a magnetic separator for medium recovery, and undersize qualified media of the clean coal medium removing sieve and the gangue medium removing sieve enter a qualified medium barrel; magnetic concentrate of the magnetic separator enters the qualified medium barrel, and magnetic tailings enter the coal slime dehydration module. The raw coal sorting equipment is a shallow slot heavy medium sorting machine.
Coal slime dehydration module: as shown in fig. 6, the centrifugate and the magnetic separation tailings from the raw coal separation module enter a hydrocyclone for concentration and classification, the underflow of the hydrocyclone enters a high-frequency sieve or a sieve bend for primary dehydration, the oversize product enters a coal slime centrifuge for secondary dehydration to obtain coarse coal slime, and the coarse coal slime enters a drying module for drying. The overflow of the hydrocyclone, the undersize of the high-frequency sieve or the sieve of the sieve bend and the centrifugal liquid of the coal slime centrifuge enter a thickener for sedimentation, the underflow of the thickener enters a filter press for filter pressing and dehydration to obtain fine coal slime, and the fine coal slime enters a drying module for drying. The overflow of the thickener and the filtrate of the filter press are used as circulating water for repeated use in the production process.
A drying module: as shown in fig. 7(a), the pulverized coal from the raw coal deep fines removal module, the coarse coal slurry and the fine coal slurry from the coal slurry dehydration module respectively enter the drying module for independent drying, and the dried product enters the blending module. When the moisture content of the pulverized coal is low, the pulverized coal can be directly sold or blended as a product without being dried; the drying device used by the drying module may be one of a rotary-wing dryer and a rotary-drum dryer.
Blending a module: as shown in fig. 8(a), the material from the drying module is transported by belt and blended into clean coal for sale as a clean coal product.
Example 2
The difference between the embodiment and the embodiment 1 is that the raw coal screening and crushing module and the raw coal deep powder removing module are the same as the embodiment 1. The raw coal screening and crushing module in the embodiment adopts a double-layer grading screen, and the specific implementation mode is as follows:
raw coal screening and crushing module: as shown in fig. 3(b), raw coal is classified by a raw coal classifying screen, oversize materials on the first layer of screen surface enter a crusher, and undersize materials enter the second layer of screen surface for fines removal. Oversize products on the second layer of screen surface enter a raw coal deep powder removal module, undersize products are pulverized coal, and the undersize products enter a drying module or are directly sold. And returning the product of the crusher to a raw coal grading sieve for grading and removing the powder. The upper layer screen surface of the raw coal classifying screen can be a rigid screen surface or a rigid-flexible coupling elastic screen surface, the lower layer screen surface is a relaxation screen surface, the size of the screen hole of the upper layer screen surface is 80mm, and the size of the screen hole of the lower layer screen surface is 2 mm. The crusher can be a double-toothed roller crusher or a grading crusher.
A raw coal deep powder removing module: as shown in fig. 4(b), the material of the raw coal deep powder removing module is oversize material on the two-layer screen surface of the raw coal classifying screen, and firstly enters a primary dry powder removing screen for powder removal, and undersize material of the primary dry powder removing screen is pulverized coal which enters a drying module or is directly sold; oversize products of the primary dry-method powder removing sieve enter a secondary dry-method powder removing sieve for secondary powder removing, undersize products of the secondary dry-method powder removing sieve enter a drying module or are directly sold, and oversize products of the secondary powder removing sieve enter a raw coal sorting module. The size of the sieve pore of the primary dry powder removing sieve is 1mm, and the size of the sieve pore of the secondary powder removing sieve is 1 mm; the screen surfaces of the primary dry powder removing screen and the secondary powder removing screen are both flip screen surfaces.
Example 3
The difference between this embodiment and embodiments 1 and 2 is the drying module, and the other modules are the same as embodiments 1 and 2, and the specific implementation manner is as follows:
a drying module: as shown in fig. 7(b), the pulverized coal from the raw coal deep fines removal module and the coarse coal slurry from the coal slurry dehydration module enter a drying device together for drying; the fine coal slime of the coal slime dehydration module is crushed and then independently dried, and the dried product enters the blending module. The drying device used by the drying module may be one of a rotary-wing dryer and a rotary-drum dryer.
Example 4
The difference between this embodiment and embodiments 1, 2, and 3 is that the module is doped, and the other modules are the same as embodiments 1, 2, and 3, and the specific implementation manner is as follows:
blending a module: blending coarse coal slurry and fine coal slurry from the drying module into pulverized coal for sale as pulverized coal, as shown in fig. 8 (b); the fine coal slurry can also be blended into clean coal as a clean coal product and the coarse coal slurry can be blended into pulverized coal as a pulverized coal product, as shown in fig. 8 (c).
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Not all embodiments are exhaustive. All obvious changes or modifications of the technical solution of the present invention are within the spirit of the present invention.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A non-quantization process for coal slime selected from wet easily-argillized power coal in wide size fractions is characterized by comprising the following steps of: set gradually six modules of raw coal screening and crushing module, raw coal degree of depth deliquescing module, raw coal sorting module, coal slime dehydration module, dry module, blending module along the coal stream trend, specific process flow is as follows:
raw coal screening and crushing module: raw coal is graded by a raw coal grading sieve, materials larger than the size of a sieve pore become oversize materials, materials smaller than the size of the sieve pore become undersize materials, the oversize materials enter a crusher to be crushed, and crushed products and undersize materials of the raw coal grading sieve enter a raw coal deep powder removal module;
a raw coal deep powder removing module: firstly, enabling crushed products obtained by a raw coal screening and crushing module and undersize of a raw coal classifying screen to enter a primary desliming screen for desliming, wherein the undersize of the primary desliming screen is pulverized coal and enters a drying module or is directly sold; oversize products of the primary powder removing sieve enter a secondary powder removing sieve for secondary powder removing, undersize products of the secondary powder removing sieve enter a drying module or are directly sold, and oversize products of the secondary powder removing sieve enter a raw coal sorting module;
raw coal sorting module: the oversize product of the secondary powder removing sieve obtained by the raw coal deep powder removing module enters raw coal sorting equipment for sorting, the light product obtained by sorting enters a clean coal medium removing sieve for dehydration and medium removal, the oversize product of the clean coal medium removing sieve enters a clean coal centrifuge for dehydration, the dehydrated product is a clean coal product, and the centrifugate enters a coal slime dehydration module; the heavy product obtained by sorting enters a gangue medium removing sieve for dehydration and medium removal, and the oversize product of the gangue medium removing sieve obtains a gangue product; undersize dilute media of the clean coal medium removing sieve and the gangue medium removing sieve enter a magnetic separator for medium recovery, and undersize qualified media of the clean coal medium removing sieve and the gangue medium removing sieve enter a qualified medium barrel; magnetic concentrate of the magnetic separator enters a qualified medium barrel, and magnetic tailings enter a coal slime dehydration module;
coal slime dehydration module: the centrifugal liquid and the magnetic separation tailings from the raw coal sorting module enter a hydrocyclone for concentration and classification, the underflow part of the hydrocyclone enters a high-frequency sieve or an arc sieve for primary dehydration, oversize products enter a coal slime centrifuge for secondary dehydration to obtain coarse coal slime, and the coarse coal slime enters a drying module for drying; the overflow part of the hydrocyclone, undersize of the high-frequency sieve or the sieve bend and the centrifugate of the coal slime centrifuge enter a thickener for sedimentation, the underflow of the thickener enters a filter press for filter pressing and dehydration to obtain fine coal slime, and the fine coal slime enters a drying module for drying; the overflow of the thickener and the filtrate of the filter press are used as circulating water for repeated use in the production process;
a drying module: fine coal from a raw coal deep powder removing module, coarse coal slime and fine coal slime from a coal slime dewatering module enter a drying module for drying, and a dried product enters a blending module;
blending a module: the material from the drying module is transported by belt, blended into clean coal products, or sold directly as pulverized coal.
2. The wet easily-argillized power coal wide-size-fraction coal slime non-quantization process as claimed in claim 1, wherein the raw coal classifying screen in the raw coal sieving and crushing module uses a single-layer screen surface or a double-layer screen surface,
when the raw coal classifying screen is a single-layer screen surface, the screen surface is a rigid screen surface or a rigid-flexible coupling elastic screen surface, and the size of the screen hole of the raw coal classifying screen is selected from 100mm or 80 mm;
when the raw coal classifying screen is a double-layer screen surface, the upper layer screen surface is a rigid screen surface or a rigid-flexible coupling elastic screen surface, the lower layer screen surface is a relaxation screen surface, the size of the screen hole of the upper layer screen surface is 100mm or 80mm, and the size of the screen hole of the lower layer screen surface is 2mm or 1 mm;
the crusher is a double-toothed roller crusher or a grading crusher.
3. The wet easy-argillization power coal wide-size-fraction selected coal slime non-quantization process as claimed in claim 2, wherein in the raw coal screening and crushing module, when the raw coal classifying screen is a double-layer screen surface, the raw coal is classified by the raw coal classifying screen, the oversize material on the first layer screen surface enters the crusher, and the undersize material enters the second layer screen surface for fines removal; oversize products on the second layer of screen surface enter a raw coal deep powder removal module, undersize products are pulverized coal, and the undersize products enter a drying module or are directly sold; and returning the product of the crusher to a raw coal grading sieve for grading and removing the powder.
4. The wet easily-argillized power coal wide-size-fraction selected coal slime non-quantization process according to claim 1, characterized in that in the raw coal deep-desilting module, the modes of two times of desilting are dry-method desilting; the screen mesh size of the primary dry powder removing screen and the secondary dry powder removing screen is 2mm or 1 mm; the screen surfaces of the primary dry powder removing screen and the secondary dry powder removing screen are both flip screen surfaces.
5. The wet easy-argillization coal slurry non-quantization process for wide-size-fraction coal entering of power coal as claimed in claim 2 or 4, wherein in the raw coal sieving and crushing module and the raw coal deep powder removing module, when the raw coal classifying screen is a double-layer screen surface, the material entering the raw coal deep powder removing module is oversize material of the two-layer screen surface of the raw coal classifying screen.
6. The non-quantitative coal slime process for wet easily-argillized power coal wide size fraction entering as claimed in claim 1, wherein in the raw coal separation module, the raw coal separation equipment is a shallow slot dense medium separator, and the raw coal with a wide size fraction of 1-100 mm is separated by the shallow slot dense medium separator.
7. The wet easily-argillized power coal wide-size-fraction selected coal slime non-quantization process as claimed in claim 1, wherein in the coal slime dehydration module, a hydrocyclone is used for concentrating and grading coal slime water, and the grading particle size is 0.25 mm; the coarse coal slime is dewatered by a high-frequency sieve or a sieve bend and a coal slime centrifugal machine, and the fine coal slime is dewatered by a thickener and a filter press.
8. The wet easily-argillized power coal wide-size-fraction beneficiation coal slime non-quantization process according to claim 1, wherein in the drying module, coarse coal slime, fine coal slime and pulverized coal are respectively dried, or the coarse coal slime and the pulverized coal slime are dried together, and the fine coal slime is independently dried.
9. The wet easily-argillized power coal wide-size-fraction coal slime non-quantization process as claimed in claim 8, wherein in the drying module, when the moisture content of the pulverized coal is low, the pulverized coal is not dried and is directly sold as a product or blended; the drying equipment adopted by the drying module is one of a rotary wing dryer and a rotary drum dryer.
10. The wet easily-argillized power coal wide-size-fraction coal slime non-quantization process as claimed in claim 1, wherein in the blending module,
coarse coal slime, fine coal slime and pulverized coal from the drying module are respectively transported by a belt and blended into clean coal products;
or the coarse coal slime and the fine coal slime are mixed into the pulverized coal for sale as the pulverized coal;
or blending the fine coal slime into clean coal to be used as a clean coal product, and blending the coarse coal slime into pulverized coal to be used as a pulverized coal product.
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