CN119114257B - Coal gangue sand and gravel aggregate production system and production method - Google Patents
Coal gangue sand and gravel aggregate production system and production method Download PDFInfo
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- CN119114257B CN119114257B CN202411625222.2A CN202411625222A CN119114257B CN 119114257 B CN119114257 B CN 119114257B CN 202411625222 A CN202411625222 A CN 202411625222A CN 119114257 B CN119114257 B CN 119114257B
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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
- 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
- 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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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Food Science & Technology (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The invention belongs to the technical field of solid waste treatment, and discloses a gangue sandstone aggregate production system and a production method, wherein the gangue sandstone aggregate production system comprises a crushing treatment device and a multi-stage separation device, a material outlet of the multi-stage separation device comprises a low-heat value coal product output end, a coal product output end and a plurality of gangue aggregate output ends, the low-calorific-value coal product output end is connected with a coal washing system, one gangue aggregate output end is connected with a sand making device, the machine-made sand product output end of a material outlet of the sand making device is connected with a sand washing system, and the waste water output ends of the coal washing system and the sand washing system are connected with a waste water treatment system. The gangue sand stone aggregate production method comprises the steps of carrying out preliminary treatment on gangue raw materials through a plurality of crushing and screening links, separating coal products and a plurality of coarse aggregate products, obtaining required machine-made sand products through sand making crushing and sand making screening links, and producing coal slime byproducts through wastewater treatment, so that efficient treatment and full utilization of the gangue raw materials are realized.
Description
Technical Field
The invention belongs to the technical field of gangue solid waste treatment, and relates to a gangue sand stone aggregate production system and a production method.
Background
The gangue is the solid waste discharged in the production process of the coal mine, accounts for 10% -20% of the yield of raw coal, and is one of the solid waste with the largest discharge in China. The gangue mainly contains inorganic matters and a small amount of organic matters, wherein the main components of the inorganic matters are SiO 2、Al2O3, caO and the like, and the largely piled gangue has large hazard and can cause environmental problems such as soil pollution, water pollution, air pollution and the like while occupying a large amount of land. However, from resource attribute analysis, coal gangue is a precious secondary resource, so that the resource utilization of the coal gangue is a necessary measure for reducing environmental pollution, and the method has important significance for realizing green development, recycling of solid wastes and sustainable development of coal industry in China.
At present, in the civil engineering construction field such as buildings, highways, railways and the like, machine-made sand aggregates used for concrete construction are mostly machine-made sand and coarse aggregates which are obtained by processing mine sand and river exploited sand through screening, crushing and other processes and meet the national construction standards. However, the cost of the ordinary mine sand and the river exploitation sand is high, and the large-scale exploitation can also have serious influence on the natural environment.
Therefore, by combining the two reasons, at present, a production process for consuming the coal gangue piled up on a large scale and utilizing the gravel aggregate required by the coal gangue production engineering construction is urgently required by coal enterprises.
Disclosure of Invention
The invention aims to provide a gangue sand aggregate production system and a production method, which solve the problems of large occupation of land and environmental pollution caused by accumulation and storage of gangue solid wastes in the prior art, and realize the efficient and full utilization of the existing large amount of gangue resources.
According to the technical scheme, the gangue sand stone aggregate production system comprises a crushing treatment device, wherein a material outlet of the crushing treatment device is connected with a multi-stage separation device, the material outlet of the multi-stage separation device comprises a low-heat-value coal product output end, a coal product output end and a plurality of gangue aggregate output ends, one gangue aggregate output end is also connected with a sand making device, and the material outlet of the sand making device comprises a machine-made sand product output end.
The low-calorific-value coal product output end is connected with a coal washing system, the machine-made sand product output end is connected with a sand washing system, the material outlets of the coal washing system and the sand washing system comprise a solid material output end and a waste water output end, and the waste water output ends of the coal washing system and the sand washing system are connected with a waste water treatment system together.
The invention is also characterized in that the crushing treatment device comprises a coarse crushing discharging bin, a coarse crushing crusher and a medium and fine crushing crusher which are sequentially connected, wherein the discharging outlet of the coarse crushing discharging bin is connected to the feeding inlet of the coarse crushing crusher, and the discharging outlet of the coarse crushing crusher is connected to the feeding inlet of the medium and fine crushing crusher through a conveying mechanism.
The multi-stage sorting device comprises a first screening device, a sorting device and a second screening device. The discharge port of the medium and fine crushing crusher is connected to the feed port of the first screening device through a conveying mechanism, the discharge port of the first screening device comprises a first large granule outlet, a first medium granule outlet and a first small granule outlet, the first large granule outlet is connected to the feed port of the medium and fine crushing crusher through the conveying mechanism, the first medium granule outlet is connected to the feed port of the sorting device through the conveying mechanism, and the output end of the low-calorific-value coal product is arranged at the first small granule outlet.
The material outlet of sorting facilities is provided with two, and coal product output sets up in one of them material outlet, and coal product output is connected with coal product heap canopy through conveying mechanism, and another material outlet is connected to the feed inlet of second screening equipment through conveying mechanism.
The gangue aggregate output end is arranged at a discharge port of the second screening device, the discharge port of the second screening device comprises a second large aggregate outlet, a second medium aggregate outlet and a second small aggregate outlet, wherein the second large aggregate outlet is connected with a finished aggregate bin I through a conveying mechanism, the second medium aggregate outlet is connected with a finished aggregate bin II through a conveying mechanism, the second small aggregate outlet comprises two connecting ends, and one connecting end is connected with a finished aggregate bin III through the conveying mechanism.
The sand making device comprises a sand making crusher and sand making screening equipment, wherein a feed inlet of the sand making crusher is connected with the other connecting end of the second small granule outlet through a conveying mechanism, and a discharge outlet of the sand making crusher is connected to the feed inlet of the sand making screening equipment through the conveying mechanism.
The discharge port of the sand making screening device comprises a third large granule outlet, a third medium granule outlet and a third small granule outlet, wherein the third large granule outlet is connected to the feed port of the sand making crusher through a conveying mechanism, the third medium granule outlet comprises two connecting ends, one connecting end is connected to the feed port of the sand making crusher through a conveying mechanism, and the machine-made sand product output end is arranged at the other connecting end of the third medium granule outlet and the third small granule outlet.
The invention is also characterized in that water spraying devices are arranged above the first screening equipment and the sand making screening equipment.
The coal washing system is positioned below the first screening equipment and comprises a first spiral sand washer and a first fine sand recycling machine which are sequentially connected, a feed inlet of the first spiral sand washer is communicated with the lower part of a first small granule outlet of the first screening equipment, a solid material output end of the coal washing system is arranged at a discharge outlet of the first fine sand recycling machine, and the discharge outlet of the first fine sand recycling machine is connected with a low-heat-value coal stacking shed through a conveying mechanism;
The sand washing system is positioned below the sand making screening equipment and comprises a second spiral sand washer and a second fine sand recycling machine which are sequentially connected, a feed inlet of the second spiral sand washer is communicated with the lower part of a third small granule outlet of the sand making screening equipment and is simultaneously communicated with the other connecting end of the third medium granule outlet, a solid material output end of the sand washing system is arranged at a discharge port of the second fine sand recycling machine, and the discharge port of the second fine sand recycling machine is connected with a machine-made sand stacking shed through a conveying mechanism;
The waste water output end of the coal washing system is arranged at the waste water outlets of the first spiral sand washer and the first fine sand recycling machine, and the waste water output end of the sand washing system is arranged at the waste water outlets of the second spiral sand washer and the second fine sand recycling machine.
The invention is also characterized in that the wastewater treatment system comprises a wastewater tank, a water inlet of the wastewater tank is communicated with wastewater outlets of the first spiral sand washer, the first fine sand recycling machine, the second spiral sand washer and the second fine sand recycling machine, a water outlet of the wastewater tank is connected to a water inlet of the thickener, a water outlet of an upper layer of the thickener is connected to a water inlet of the clean water tank, a slurry pump is connected to a slurry outlet at the bottom of the thickener and is connected to a feed inlet of a filter press through the slurry pump, and a water outlet of the filter press is also connected to the water inlet of the clean water tank;
the water inlet of the water spraying device is communicated with the clean water tank.
The sand production screening device is further characterized in that the first screening device is provided with two screens with the screening size controlled, namely a 5mm screen and a 31.5mm screen, the second screening device is provided with two screens with the screening size controlled, namely a 10mm screen and a 20mm screen, and the sand production screening device is provided with two screens with the screening size controlled, namely a 3mm screen and a 5mm screen.
The invention is also characterized in that the jaw crusher is selected as the coarse crusher, the impact crusher is selected as the middle and fine crusher, the vertical shaft crusher is selected as the sand making crusher, the circular vibrating screen is selected as the first screening device, the second screening device and the sand making screening device, the intelligent photoelectric separator is selected as the sorting device, and the belt conveyor is adopted as the conveying mechanism.
The invention adopts another technical scheme that the gangue sand stone aggregate production method adopts the gangue sand stone aggregate production system, and comprises the following production steps:
Step 1, crushing treatment
Continuously conveying the gangue raw materials to a crushing treatment device for crushing, and then outputting to a multi-stage sorting link;
Step 2, multistage screening
Screening the medium and fine crushed materials, on one hand, screening out relatively large-particle materials, conveying the materials back to a crushing treatment link for cyclic crushing, on the other hand, screening out relatively moderate-particle materials, further sorting out coal products and gangue aggregates, further screening the gangue aggregates into a plurality of categories of coarse aggregate products, and conveying part of the coarse aggregate products as sand making raw materials to a sand making link;
step 3, sand making
Firstly, sand making and crushing are carried out on coarse aggregate products, then sand making and screening are carried out, on one hand, materials with relatively large particles are screened out, and are conveyed and returned to a sand making and crushing link for circular crushing, on the other hand, materials with relatively small particles are screened out and are used as machine-made sand products for processing treatment, on the other hand, materials with relatively moderate particles are screened out and are separated into two parts for output, one part of the materials with relatively medium particles and the materials with relatively large particles are conveyed and returned to the sand making and crushing link for circular crushing, and the other part of the materials with relatively small particles and the materials with relatively small particles are used as machine-made sand products for processing treatment.
The invention is also characterized in that:
step 1 comprises the following subdivision steps:
step 1.1, transferring the coal gangue raw materials piled up in an unloading field to a coarse crushing discharging bin, and continuously feeding the coal gangue raw materials to a coarse crushing crusher through the coarse crushing discharging bin for coarse crushing;
And 1.2, conveying the coarsely crushed materials to a medium and fine crushing machine for medium and fine crushing by a conveying mechanism, and outputting the medium and fine crushed materials by the conveying mechanism.
Step2 comprises the following subdivision steps:
step 2.1, conveying the finely crushed materials to first screening equipment for screening, and outputting the screened materials from a first large granule outlet, a first medium granule outlet and a first small granule outlet respectively according to screening conditions of the first screening equipment;
And 2.2, respectively treating the materials output from the first large granule outlet, the first medium granule outlet and the first small granule outlet by adopting the following methods:
A. The materials output by the first large granule outlet are returned to the medium fine crushing machine through the conveying mechanism to be subjected to medium fine crushing again, a closed circuit is formed between the first large granule outlet and the medium fine crushing machine, and large coal gangue is circularly crushed;
B. the material output by the first medium grain outlet is conveyed to sorting equipment for sorting through a conveying mechanism, the sorted product comprises coal products and gangue aggregates, the coal products are conveyed to a coal product stacking shed for storage and delivery through the conveying mechanism, and the gangue aggregates are processed through the step 2.3;
C. the material output from the first small granule outlet enters a coal washing system for treatment;
step 2.3, conveying the separated gangue aggregate to second screening equipment for screening by a conveying mechanism, and outputting the screened materials from a second large granule outlet, a second medium granule outlet and a second small granule outlet respectively according to screening conditions of the second screening equipment;
And 2.4, respectively treating the materials output from the second large granule outlet, the second medium granule outlet and the second small granule outlet by adopting the following methods:
A. The material output by the second large aggregate outlet is used as coarse aggregate product, and is conveyed to a finished aggregate bin through a conveying mechanism for storage and delivery;
B. the material output by the second middle grain outlet is used as coarse aggregate product, and is conveyed to a second storage and delivery of a finished aggregate bin through a conveying mechanism;
C. the material output from the second small aggregate outlet is divided into two parts, one part is taken as coarse aggregate product, and is conveyed to a finished aggregate bin three for storage and delivery by a conveying mechanism, and the other part is taken as sand making raw material and is output by the conveying mechanism.
Step3 comprises the following subdivision steps:
step 3.1, firstly, conveying coarse aggregate products serving as sand making raw materials to a sand making crusher for sand making crushing;
Step 3.2, conveying the crushed sand-making materials to sand-making screening equipment for screening by a conveying mechanism, and outputting the screened materials from a third large granule outlet, a third medium granule outlet and a third small granule outlet respectively according to screening conditions of the sand-making screening equipment;
and 3.3, respectively treating the materials output from the third large granule outlet, the third medium granule outlet and the third small granule outlet by adopting the following methods:
A. returning the materials output from the third large granule outlet to the sand making crusher through the conveying mechanism to perform sand making crushing again;
B. The material output by the grain material outlet in the third step is divided into two parts, one part returns to the sand making crusher through the conveying mechanism to make sand again and crush, and the other part enters the sand washing system to be treated;
C. And the materials output from the third small granule outlet enter a sand washing system for treatment.
The invention is also characterized in that:
In the screening process of the step 2.1 and the step 3.2, water spraying is carried out by adopting a water spraying device;
In the step 2.1, the screening condition of the first screening equipment is that the materials with the grain diameter of more than or equal to 31.5mm are output from a first large grain outlet, the materials with the grain diameter of less than or equal to 5mm are output from a first medium grain outlet, and the materials with the grain diameter of less than or equal to 31.5mm are output from a first small grain outlet;
in the step 2.3, the screening condition of the second screening device is that the material with the particle size of less than or equal to 20mm is output from a second large granule outlet, the material with the particle size of less than or equal to 10mm is output from a second medium granule outlet, and the material with the particle size of less than or equal to 5mm is output from a second small granule outlet;
in the step 3.2, the screening condition of the sand making screening device is that the material with the grain diameter of more than or equal to 5mm is output from a third large grain outlet, the material with the grain diameter of less than or equal to 3mm is output from a third medium grain outlet, and the material with the grain diameter of less than or equal to 3mm is output from a third small grain outlet;
The invention is also characterized in that the coal washing system carries out the following treatment steps:
Step a1, sequentially processing materials output from a first small granule outlet through a first spiral sand washer and a first fine sand recycling machine to produce low-calorific-value coal with the particle size of 0-5mm, and discharging wastewater discharged from the first spiral sand washer and the first fine sand recycling machine into a wastewater treatment system for treatment;
and a2, conveying the low-heat-value coal to a low-heat-value coal stacking shed for storage and shipment through a conveying mechanism.
The sand washing system carries out the following treatment steps:
step b1, treating part of materials output by a third medium grain outlet and materials output by a third small grain outlet sequentially by a second spiral sand washer and a second fine sand recycling machine to produce machine-made sand products with the grain diameter of 0-5mm, and discharging wastewater discharged by the second spiral sand washer and the second fine sand recycling machine into a wastewater treatment system for treatment;
And b2, conveying the machine-made sand products to a machine-made sand stacking shed for storage and shipment through a conveying mechanism.
The wastewater treatment system carries out the following treatment steps:
Step c1, delivering wastewater generated by the coal washing system and the sand washing system into a wastewater pool through self-flowing, and delivering the wastewater to a thickener for sedimentation separation treatment;
Step c2, conveying clear water at the upper layer of the thickener to a clear water tank, pumping thick slurry at the bottom of the thickener to a filter press workshop through a slurry pump to further remove water, conveying mud cakes produced by the filter press to a coal mud stacking shed for storage or delivery, and conveying clear water discharged by the filter press to the clear water tank;
and step c3, supplying water to the water spraying device by the clean water tank to realize the cyclic utilization of water resources.
The invention is also characterized in that the coarse crusher 2 adopts a crushing method of open circuit crushing for crushing.
The invention has the beneficial effects that the gangue sand aggregate production system and the gangue sand aggregate production method are a full-process production system which combines devices such as gangue crushing, gangue sorting, gangue screening, coal washing, sand washing, wastewater treatment and the like together and is matched with each other, and a full-process production process which processes and produces gangue raw materials into various high-quality sand aggregates and coal products, can provide a large-scale absorption means for stockpiling gangue, and can realize high-quality and high-efficiency production of products such as the gangue sand aggregates.
The gangue sand stone aggregate production system and the gangue sand stone aggregate production method provided by the invention can be used for producing 5-10 mm, 10-20 mm and 20-31.5 mm gangue coarse aggregate, 0-5mm gangue machine-made sand, low-calorific-value coal, products such as coal, coal slime and the like, are various in product types and wide in application range, can realize high-efficiency and full utilization of gangue resources, reduce dust pollution in the production process, and are favorable for natural environment protection and sustainable development of coal industry.
Drawings
FIG. 1 is a schematic diagram of a gangue sand aggregate production system in accordance with the present invention;
FIG. 2 is a process flow diagram of the gangue sand aggregate production method of the invention.
In the figure, 1, a coarse crushing discharging bin, 2, a coarse crushing crusher, 3, a medium crushing crusher, 4, a first screening device, 5, a sorting device, 6, a second screening device, 7, a sand making crusher, 8, a sand making screening device, 9, a water spraying device, 10, a first spiral sand washer, 11, a first fine sand recycling machine, 12, a second spiral sand washer, 13, a second fine sand recycling machine, 14, a coal product stacking shed, 15, a low-heat value coal stacking shed, 16, a finished product first, 17, a finished product second, 18, a finished product third, 19, a machine-made sand stacking shed, 20, a coal slime stacking shed, 21, a wastewater pool, 22, a thickener, 23, a filter press, 24 and a clean water pool.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
Example 1:
as shown in fig. 1, the gangue sand aggregate production system comprises a coarse crushing discharging bin 1, a coarse crushing crusher 2, a medium fine crushing crusher 3, a first screening device 4, a sorting device 5, a second screening device 6, a sand making crusher 7 and a sand making screening device 8 which are sequentially communicated, and further comprises a coal product stacking shed 14, a low heat value coal stacking shed 15, a finished product aggregate bin I16, a finished product aggregate bin II 17, a finished product aggregate bin III 18 and a machine-made sand stacking shed 19;
The coal gangue raw materials to be crushed are input from a feed inlet of a coarse crushing discharging bin 1, a discharging outlet of the coarse crushing discharging bin 1 is connected with a feed inlet of a coarse crushing crusher 2, a discharge outlet of the coarse crushing crusher 2 is connected to a feed inlet of a medium-fine crushing crusher 3 through a conveying mechanism, and a discharge outlet of the medium-fine crushing crusher 3 is connected to a feed inlet of a first screening device 4 through a conveying mechanism.
The first screening device 4 is provided with three material outlets, namely a first large granule outlet, a first medium granule outlet and a first small granule outlet, wherein the first large granule outlet is connected to the feed inlet of the medium and fine crushing machine 3 through a conveying mechanism, the first medium granule outlet is connected to the feed inlet of the sorting device 5 through a conveying mechanism, and the first small granule outlet is connected with a coal washing system and is connected to the low heat value coal pile shed 15 through the coal washing system.
The sorting device 5 is provided with two material outlets, one material outlet being connected to the coal product stacking shed 14 by means of a conveyor mechanism and the other material outlet being connected to the second screening device 6 by means of a conveyor mechanism.
The second screening device 6 is also provided with three material outlets, namely a second large granule outlet, a second medium granule outlet and a second small granule outlet, wherein the second large granule outlet is connected to the first finished aggregate bin 16 through a conveying mechanism, the second medium granule outlet is connected to the second finished aggregate bin 17 through a conveying mechanism, the second small granule outlet is connected to the third finished aggregate bin 18 and the feed inlet of the sand making crusher 7 through a conveying mechanism, and the discharge outlet of the sand making crusher 7 is connected to the feed inlet of the sand making screening device 8 through a conveying mechanism.
The sand making screening device 8 is also provided with three material outlets, namely a third large granule outlet, a third medium granule outlet and a third small granule outlet, wherein the third large granule outlet is connected to the feed inlet of the sand making crusher 7 through a conveying mechanism, the third small granule outlet is connected with a sand washing system and is connected to the machine-made sand stacking shed 19 through the sand washing system, and the third medium granule outlet is connected to the feed inlet of the sand making crusher 7 and the feed inlet of the sand washing system through a conveying mechanism.
By adopting the technical scheme, the devices such as gangue crushing, gangue sorting, gangue screening, coal washing, sand washing, wastewater treatment and the like are combined together and matched with each other, so that a full-flow gangue sand stone aggregate production system can be obtained, a large-scale means for storing the gangue is provided, products such as high-quality gangue sand stone aggregate and the like can be directly produced from gangue raw materials, and high-quality and high-efficiency production of the products such as the gangue sand stone aggregate and the like is realized.
In this embodiment, the coal washing system is located below the first screening device 4, the coal washing system includes a first spiral sand washer 10 and a first fine sand recycling machine 11 that connect gradually, a feed inlet of the first spiral sand washer 10 is communicated below a first small granule outlet of the first screening device 4, and a discharge outlet of the first fine sand recycling machine 11 is connected to a low-calorific-value coal pile shed 15 through a conveying mechanism.
The sand washing system is located below the sand making screening device 8, and comprises a second spiral sand washer 12 and a second fine sand recycling machine 13 which are sequentially connected, wherein a feed inlet of the second spiral sand washer 12 is communicated below a third small granule outlet of the sand making screening device 8 and is simultaneously communicated with an output port of the third medium granule outlet, and a discharge port of the second fine sand recycling machine 13 is connected to a machine-made sand stacking shed 19 through a conveying mechanism.
Water spraying devices 9 are arranged above the first screening device 4 and the sand making screening device 8. The wastewater outlets of the first spiral sand washer 10 and the first fine sand recoverer 11, and the second spiral sand washer 12 and the second fine sand recoverer 13 are all connected to a wastewater treatment system.
By adopting the technical scheme, water is sprayed in the first screening and sand making screening processes, and the spiral sand washer and the fine sand recycling machine are utilized to treat undersize materials, so that coal slime can be effectively separated, the quality of coal products and sand stone aggregate products is improved, and coal slime byproducts can be produced.
In this embodiment, the wastewater treatment system includes a wastewater tank 21, a water inlet of the wastewater tank 21 is communicated with wastewater outlets of the first spiral sand washer 10, the first fine sand recoverer 11, the second spiral sand washer 12 and the second fine sand recoverer 13, a water outlet of the wastewater tank 21 is connected to a water inlet of a thickener 22, a water outlet of an upper layer of the thickener 22 is connected to a water inlet of a clean water tank 24, a slurry outlet of a bottom of the thickener 22 is connected with a slurry pump, and is connected to a feed inlet of a filter press 23 through the slurry pump, and a water outlet of the filter press 23 is also connected to a water inlet of the clean water tank 24.
The water inlet of the water spraying device 9 is communicated with the clean water tank 24.
By adopting the technical scheme, the production water of the gangue sand stone aggregate can be recycled through the wastewater treatment system, so that the discharge of production wastewater is reduced, and even zero discharge of wastewater is realized.
Example 2:
On the basis of embodiment 1, in this embodiment, the first screening apparatus 4 is provided with two screens of controlled screening size, 5mm size and 31.5mm size, respectively, the second screening apparatus 6 is provided with two screens of controlled screening size, 10mm size and 20mm size, respectively, and the sand making screening apparatus 8 is provided with two screens of controlled screening size, 3mm size and 5mm size, respectively.
In the embodiment, the jaw crusher is selected as the coarse crusher 2, the impact crusher is selected as the fine crusher 3, and the vertical shaft crusher is selected as the sand making crusher 7. The first screening device 4, the second screening device 6 and the sand making screening device 8 are all circular vibrating screens. The sorting equipment 5 selects an intelligent photoelectric sorting machine, and specifically, the intelligent photoelectric sorting machine can select a T108 horizontal throwing type intelligent sorting machine or a CN3000 intelligent sorting machine. The conveying mechanisms are all belt conveyors.
Example 3:
the gangue raw materials are generally piled up in a large quantity on an unloading site, and the gangue raw materials on the unloading site are treated by using the gangue sand aggregate production method provided by the invention.
As shown in fig. 2, the gangue sand aggregate production method, using the gangue sand aggregate production system proposed in example 1 or 2, comprises the following production steps:
Step1, crushing treatment, which specifically comprises the following subdivision steps:
And 1.1, transferring the gangue raw materials piled up in an unloading site to a coarse crushing discharging bin 1 through a self-unloading vehicle, and enabling the gangue raw materials to enter a coarse crushing crusher 2 through the coarse crushing discharging bin 1, wherein the coarse crushing crusher 2 adopts a jaw crusher to crush in an open-circuit crushing mode. In the step, the coarse crushing discharging bin 1 is used for directly receiving the gangue raw materials in the unloading field so as to achieve the purpose of continuously feeding the coarse crushing crusher 2.
Step 1.2, conveying the coarsely crushed materials to a medium and fine crushing machine 3 through a belt conveyor to enter a medium and fine crushing link, wherein the medium and fine crushing machine 3 adopts an impact crusher, and the medium and fine crushed materials are output through a conveying mechanism;
Step 2, multistage screening, specifically comprising the following subdivision steps:
Step 2.1, conveying the finely crushed materials to a first screening device 4 through a belt conveyor to enter a screening step, wherein the first screening device 4 adopts a circular vibrating screen, the screen control size is 5mm and 31.5mm, the screened materials are respectively output from a first large granule outlet, a first medium granule outlet and a first small granule outlet, and a water spraying device 9 is used for spraying water in the screening process, so that dust pollution is reduced, and pulverized coal is collected;
And 2.2, respectively treating the materials output from the first large granule outlet, the first medium granule outlet and the first small granule outlet by adopting the following methods:
A. the materials with the grain diameter of more than or equal to 31.5mm are output from a first large grain outlet, returned to the medium fine crushing machine 3 through the belt conveyor to enter a medium fine crushing link again, form a closed circuit with the medium fine crushing link, and circularly crush the coal gangue with larger blocks;
B. The materials with the grain diameter less than or equal to 5mm and less than 31.5mm are output from a first middle grain outlet and are conveyed to a sorting device 5 through a belt conveyor to enter a sorting link, the sorting device 5 selects an intelligent photoelectric sorting machine, the sorted products comprise coal products and gangue aggregates, the coal products are conveyed to a coal product stacking shed 14 through the belt conveyor to be stored and transported, and the gangue aggregates are processed through the step 2.3;
C. Outputting materials with the particle size of less than 5mm from a first small particle outlet, and feeding the materials into a coal washing system below the circular vibrating screen for treatment;
In the step, an intelligent photoelectric separator is selected for separating the coal gangue, the intelligent photoelectric separator is based on X-ray perspective, other visible spectrums are fused, mineral structures and substance components are detected in a multi-dimensional mode, advanced AI algorithm is adopted for real-time identification and accurate classification, and the accurate separation of coal products and gangue aggregates can be realized by matching with a customized injection mode, wherein the coal rate in the gangue aggregates after separation is less than 2%, and the separation precision and efficiency are high.
Step 2.3, conveying the sorted gangue aggregates to a second screening device 6 through a belt conveyor to enter a second screening link, wherein the second screening link mainly screens finished aggregate products, the second screening device 6 adopts a circular vibrating screen, the screen control size is 10mm and 20mm, and the screened materials are output from a second large granule outlet, a second medium granule outlet and a second small granule outlet respectively;
And 2.4, respectively treating the materials output from the second large granule outlet, the second medium granule outlet and the second small granule outlet by adopting the following methods:
A. The material with the grain diameter of less than or equal to 20mm and less than 31.5mm is taken as coarse aggregate product, and is output from a second large aggregate outlet and is conveyed to a first 16-storage and delivery finished aggregate bin through a belt conveyor;
B. The material with the grain diameter of less than or equal to 10mm and less than 20mm is taken as coarse aggregate product, and is output from a second middle grain outlet and is conveyed to a second 17 finished aggregate bin through a belt conveyor for storage and delivery;
C. The material with the grain diameter of less than or equal to 5mm and less than 10mm is output from the second small grain outlet and then is divided into two parts, wherein one part is used as coarse aggregate product, the coarse aggregate product is conveyed to a third 18 finished aggregate bin through a belt conveyor for storage and delivery, and the other part is used as sand-making raw material to be output through the belt conveyor;
In the step, the dividing ratio of the two parts of materials after the materials with the particle size of 5mm or less and the particle size of 10mm are output from the second small particle outlet is determined according to the yield plan or the product target of the coarse aggregate product and the machine-made sand product to be actually produced. If necessary, the production of coarse aggregate products with the particle size of 5mm or less and grade of <10mm can be stopped, or the production of machine-made sand products can be stopped.
Step 3, sand making, which specifically comprises the following subdivision steps:
Step 3.1, conveying coarse aggregate products serving as sand making raw materials to a sand making crusher 7 to enter a sand making crushing link, wherein the sand making crusher 7 is a vertical shaft type crusher;
Step 3.2, conveying the crushed sand-making materials to a sand-making screening device 8 through a belt conveyor to enter a three-screening step, which can also be called a sand-making screening step, wherein the sand-making screening device 8 adopts a circular vibrating screen, the screen control size is 3mm and 5mm, the screened materials are respectively output from a third large granule outlet, a third medium granule outlet and a third small granule outlet, and water spraying devices 9 are also used for spraying water in the screening process, so that dust pollution is reduced on one hand, and pulverized coal is collected on the other hand;
and 3.3, respectively treating the materials output from the third large granule outlet, the third medium granule outlet and the third small granule outlet by adopting the following methods:
A. Outputting the materials with the grain diameter of more than or equal to 5mm from a third large grain outlet, returning the materials to the sand making crusher 7 through a belt conveyor, and re-entering a sand making crushing link;
B. The material with the grain diameter of less than or equal to 3mm and less than 5mm is output from a third middle grain outlet and then is divided into two parts, one part returns to the sand making crusher 7 through the belt conveyor to enter a sand making crushing link again, and the other part enters a sand washing system below the circular vibrating screen for treatment;
C. And outputting the material with the particle size of less than 3mm from a third small particle outlet, and feeding the material into a sand washing system below the circular vibrating screen for treatment.
In the step, the third large granule outlet and the third medium granule outlet form a closed circuit with the sand making crushing link, and the materials with relatively large granules are circularly crushed.
In the step, a technological process of combining sand making crushing and sand making screening is set, a third medium grain outlet and a third small grain outlet output machine-made sand products together, so that the regulation function of machine-made sand grain composition is realized, and the product quality of coal gangue machine-made sand is effectively ensured. Specifically, the dividing ratio of the two parts of materials after the materials with the particle size of 3mm or less and the particle size of 5mm are output from the third middle particle outlet is also determined according to the product requirement of the machine-made sand product to be actually produced.
In this embodiment, the steps of the coal washing system are as follows:
Step a1, materials with the grain diameter smaller than 5mm output from a first small grain outlet are sequentially processed by a first spiral sand washer 10 and a first fine sand recycling machine 11 to produce low-heat-value coal with the grain diameter of 0-5mm, and wastewater discharged by the first spiral sand washer 10 and the first fine sand recycling machine 11 is discharged into a wastewater treatment system for treatment;
step a2, conveying the low-calorific-value coal to the low-calorific-value coal stacking shed 15 through a belt conveyor for storage and shipment.
In this embodiment, the steps of the sand washing system are as follows:
Step b1, the part of the material with the grain diameter less than or equal to 3mm and less than or equal to 5mm output from a third medium grain outlet and the material with the grain diameter less than 3mm output from a third small grain outlet are sequentially processed by a second spiral sand washer 12 and a second fine sand recycling machine 13 to produce machine-made sand products with the grain diameter of 0-5mm, and wastewater discharged by the second spiral sand washer 12 and the second fine sand recycling machine 13 is discharged into a wastewater treatment system for treatment;
And b2, conveying the machine-made sand products to a machine-made sand stacking shed 19 through a belt conveyor for storage and shipment.
In this embodiment, the steps of the wastewater treatment system are as follows:
step c1, after wastewater generated by the coal washing system and the sand washing system enters a wastewater pool 21 through self-flowing, the wastewater is conveyed to a thickener 22 for sedimentation separation treatment;
step c2, conveying clear water at the upper layer of the thickener 22 to a clear water tank 24, pumping thick slurry at the bottom of the thickener 22 to a filter press workshop through a slurry pump to further remove water, conveying mud cakes produced by the filter press 23 to a coal mud stacking shed 20 for storage or delivery, and conveying clear water discharged by the filter press 23 to the clear water tank 24;
And step c3, the clean water tank 24 supplies water for the water spraying device 9, so that water resources are recycled.
In the above technical solution, in the first screening device 4 and the sand making screening device 8, a small amount of waste water may be generated in the process of screening materials, and the waste water may also enter the waste water tank 21 for treatment together through self-flowing.
According to the working principle of the embodiment, the coal gangue sand stone aggregate production method comprises the steps of carrying out preliminary treatment on coal gangue raw materials through a coarse crushing link, a medium fine crushing link, a first screening link and a sorting link, further separating coal products and gangue aggregate products, synchronously carrying out cyclic crushing in the sorting link, improving the production efficiency and the product quality of the coal products and the gangue aggregate products, classifying the gangue aggregate through a second screening link to obtain various high-quality coarse aggregate products, treating part of coarse aggregate through a sand making crushing link and a sand making screening link to obtain required machine-made sand products, and simultaneously adopting a technological process of combining sand making crushing and sand making screening to improve the production efficiency and the product quality of the machine-made sand products, and realizing the regulation function of the grain grading of the machine-made sand products.
In addition, the invention reduces dust pollution in the production process by spraying water in the screening process of the first screen and the sand production, simultaneously collects coal dust, adopts a coal washing system and a sand washing system to treat undersize materials, further improves the quality of coal and sand aggregate products, simultaneously can produce coal slime byproducts, and realizes the efficient and full utilization of coal gangue resources.
Claims (9)
1. The gangue sand stone aggregate production system is characterized by comprising a crushing treatment device, wherein a material outlet of the crushing treatment device is connected with a multi-stage separation device, the material outlet of the multi-stage separation device comprises a low-heat-value coal product output end, a coal product output end and a plurality of gangue aggregate output ends, one gangue aggregate output end is also connected with a sand making device, and the material outlet of the sand making device comprises a machine-made sand product output end;
The coal washing system is characterized in that the output end of the low-calorific-value coal product is connected with a coal washing system, the output end of the machine-made sand product is connected with a sand washing system, the material outlets of the coal washing system and the sand washing system comprise a solid material output end and a waste water output end, and the waste water output ends of the coal washing system and the sand washing system are connected with a waste water treatment system together;
The crushing treatment device comprises a coarse crushing discharging bin (1), a coarse crushing crusher (2) and a medium fine crushing crusher (3) which are sequentially connected, wherein a discharging outlet of the coarse crushing discharging bin (1) is connected to a feeding port of the coarse crushing crusher (2), and a discharging port of the coarse crushing crusher (2) is connected to a feeding port of the medium fine crushing crusher (3) through a conveying mechanism;
The multistage sorting device comprises a first screening device (4), a sorting device (5) and a second screening device (6), wherein a discharge port of the medium and fine crushing machine (3) is connected to a feed port of the first screening device (4) through a conveying mechanism, the discharge port of the first screening device (4) comprises a first large granule outlet, a first medium granule outlet and a first small granule outlet, the first large granule outlet is connected to the feed port of the medium and fine crushing machine (3) through a conveying mechanism, the first medium granule outlet is connected to the feed port of the sorting device (5) through a conveying mechanism, and the output end of the low-calorific-value coal product is arranged at the first small granule outlet;
The two material outlets of the sorting equipment (5) are arranged, the coal product output end is arranged at one of the material outlets, the coal product output end is connected with a coal product stacking shed (14) through a conveying mechanism, and the other material outlet is connected to a feed inlet of the second screening equipment (6) through the conveying mechanism;
The gangue aggregate output end is arranged at a discharge port of the second screening device (6), the discharge port of the second screening device (6) comprises a second large aggregate outlet, a second medium aggregate outlet and a second small aggregate outlet, the second large aggregate outlet is connected with a finished aggregate bin I (16) through a conveying mechanism, the second medium aggregate outlet is connected with a finished aggregate bin II (17) through a conveying mechanism, the second small aggregate outlet comprises two connecting ends, and one connecting end is connected with a finished aggregate bin III (18) through the conveying mechanism;
The sand making device comprises a sand making crusher (7) and sand making screening equipment (8), wherein a feed inlet of the sand making crusher (7) is connected with the other connecting end of the second small granule outlet through a conveying mechanism, and a discharge outlet of the sand making crusher (7) is connected to the feed inlet of the sand making screening equipment (8) through the conveying mechanism;
The discharge gate of system sand screening equipment (8) includes big granule export of third, well granule export of third and the export of little granule of third, and wherein big granule export of third is connected to through conveying mechanism the feed inlet of system sand breaker (7), and well granule export of third includes two link, and one of them link is connected to through conveying mechanism the feed inlet of system sand breaker (7), mechanism sand product output set up in another link of granule export in the third, and the export of little granule of third.
2. The gangue sand aggregate production system as claimed in claim 1, wherein water spraying devices (9) are arranged above the first screening device (4) and the sand making screening device (8);
The coal washing system is located below the first screening device (4), the coal washing system comprises a first spiral sand washer (10) and a first fine sand recycling machine (11) which are sequentially connected, a feed inlet of the first spiral sand washer (10) is communicated with a first small granule outlet of the first screening device (4), a solid material output end of the coal washing system is arranged at a discharge outlet of the first fine sand recycling machine (11), and a discharge outlet of the first fine sand recycling machine (11) is connected with a low-heat-value coal stacking shed (15) through a conveying mechanism;
The sand washing system is positioned below the sand making screening device (8), the sand washing system comprises a second spiral sand washer (12) and a second fine sand recycling machine (13) which are sequentially connected, a feed inlet of the second spiral sand washer (12) is communicated with a third small granule outlet of the sand making screening device (8) and the other connecting end of a third medium granule outlet, a solid material output end of the sand washing system is arranged at a discharge outlet of the second fine sand recycling machine (13), and the discharge outlet of the second fine sand recycling machine (13) is connected with a machine-made sand stacking shed (19) through a conveying mechanism;
The waste water output end of the coal washing system is arranged at the waste water outlets of the first spiral sand washer (10) and the first fine sand recycling machine (11), and the waste water output end of the sand washing system is arranged at the waste water outlets of the second spiral sand washer (12) and the second fine sand recycling machine (13).
3. The gangue sand aggregate production system as claimed in claim 2, wherein the wastewater treatment system comprises a wastewater tank (21), wherein the water inlet of the wastewater tank (21) is communicated with the wastewater outlets of the first spiral sand washer (10), the first fine sand recycling machine (11), the second spiral sand washer (12) and the second fine sand recycling machine (13), the water outlet of the wastewater tank (21) is connected to the water inlet of a thickener (22), the upper water outlet of the thickener (22) is connected to the water inlet of a clean water tank (24), the bottom slurry outlet of the thickener (22) is connected to a slurry pump, and is connected to the feed inlet of a filter press (23) through the slurry pump, and the water outlet of the filter press (23) is also connected to the water inlet of the clean water tank (24);
the water inlet of the water spraying device (9) is communicated with the clean water tank (24).
4. A gangue sand aggregate production system as claimed in any one of claims 1-3, wherein the first screening apparatus (4) is provided with two screens of controlled screening size, a 5mm gauge screen and a 31.5mm gauge screen, respectively;
The second screening device (6) is provided with two screens for controlling the screening size, namely a screen with the specification of 10mm and a screen with the specification of 20 mm;
The sand making screening device (8) is provided with two screens for controlling screening size, namely a screen with the specification of 3mm and a screen with the specification of 5mm.
5. The gangue sand and stone aggregate production system as claimed in claim 4, wherein the coarse crusher (2) is a jaw crusher, the medium fine crusher (3) is an impact crusher, and the sand making crusher (7) is a vertical shaft crusher;
The first screening device (4), the second screening device (6) and the sand making screening device (8) are all round vibrating screens;
the sorting equipment (5) is an intelligent photoelectric sorting machine;
the conveying mechanisms are all belt conveyors.
6. A method for producing gangue sand aggregate, characterized in that the gangue sand aggregate production system as claimed in any one of claims 3-5 is used, comprising the following steps:
Step 1, crushing treatment
Continuously conveying the gangue raw materials to a crushing treatment device for crushing, and then outputting to a multi-stage sorting link;
Step 2, multistage screening
Screening the medium and fine crushed materials, on one hand, screening out relatively large-particle materials, conveying the materials back to a crushing treatment link for cyclic crushing, on the other hand, screening out relatively moderate-particle materials, further sorting out coal products and gangue aggregates, further screening the gangue aggregates into a plurality of categories of coarse aggregate products, and conveying part of the coarse aggregate products as sand making raw materials to a sand making link;
step 3, sand making
Firstly, sand making and crushing are carried out on coarse aggregate products, then sand making and screening are carried out, on one hand, materials with relatively large particles are screened out, and are conveyed and returned to a sand making and crushing link for circular crushing, on the other hand, materials with relatively small particles are screened out and are used as machine-made sand products for processing treatment, on the other hand, materials with relatively moderate particles are screened out and are separated into two parts for output, one part of the materials with relatively medium particles and the materials with relatively large particles are conveyed and returned to the sand making and crushing link for circular crushing, and the other part of the materials with relatively small particles and the materials with relatively small particles are used as machine-made sand products for processing treatment.
7. The method for producing gangue sand aggregate as claimed in claim 6, wherein:
step 1 comprises the following subdivision steps:
Step 1.1, transferring the coal gangue raw materials piled up in an unloading field to a coarse crushing unloading bin (1), and continuously feeding the coal gangue raw materials to a coarse crushing crusher (2) through the coarse crushing unloading bin (1) for coarse crushing;
Step 1.2, conveying the coarsely crushed materials to a medium and fine crushing machine (3) for medium and fine crushing through a conveying mechanism, and outputting the medium and fine crushed materials through the conveying mechanism;
step2 comprises the following subdivision steps:
step 2.1, conveying the finely crushed materials to first screening equipment (4) for screening, and outputting the screened materials from a first large granule outlet, a first medium granule outlet and a first small granule outlet respectively according to screening conditions of the first screening equipment (4);
And 2.2, respectively treating the materials output from the first large granule outlet, the first medium granule outlet and the first small granule outlet by adopting the following methods:
A. The materials output by the first large granule outlet are returned to the medium and fine crushing crusher (3) through the conveying mechanism to be subjected to medium and fine crushing again, a closed circuit is formed between the first large granule outlet and the medium and fine crushing crusher (3), and large coal gangue is circularly crushed;
B. the material output by the first medium grain outlet is conveyed to a sorting device (5) for sorting through a conveying mechanism, the sorted product contains coal products and gangue aggregates, the coal products are conveyed to a coal product stacking shed (14) for storage and delivery through the conveying mechanism, and the gangue aggregates are processed through the step 2.3;
C. the material output from the first small granule outlet enters a coal washing system for treatment;
Step 2.3, conveying the separated gangue aggregate to second screening equipment (6) for screening, and outputting the screened materials from a second large granule outlet, a second medium granule outlet and a second small granule outlet respectively according to screening conditions of the second screening equipment (6);
And 2.4, respectively treating the materials output from the second large granule outlet, the second medium granule outlet and the second small granule outlet by adopting the following methods:
A. The material output by the second large aggregate outlet is used as coarse aggregate product, and is conveyed to a first finished aggregate bin (16) for storage and delivery through a conveying mechanism;
B. the material output by the second middle grain outlet is used as coarse aggregate product, and is conveyed to a second finished aggregate bin (17) for storage and delivery through a conveying mechanism;
C. the material output from the second small aggregate outlet is divided into two parts, one part is taken as coarse aggregate product, and is conveyed to a finished aggregate bin III (18) for storage and delivery by a conveying mechanism, and the other part is taken as sand making raw material and is output by the conveying mechanism;
step3 comprises the following subdivision steps:
step 3.1, firstly, conveying coarse aggregate products serving as sand making raw materials to a sand making crusher (7) for sand making crushing;
Step 3.2, conveying the crushed sand-making materials to a sand-making screening device (8) for screening, and outputting the screened materials from a third large granule outlet, a third medium granule outlet and a third small granule outlet respectively according to screening conditions of the sand-making screening device (8);
and 3.3, respectively treating the materials output from the third large granule outlet, the third medium granule outlet and the third small granule outlet by adopting the following methods:
A. returning the materials output from the third large granule outlet to a sand making crusher (7) through a conveying mechanism to perform sand making crushing again;
B. the material output by the grain material outlet in the third step is divided into two parts, one part returns to the sand making crusher (7) through the conveying mechanism to make sand again for crushing, and the other part enters the sand washing system for treatment;
C. And the materials output from the third small granule outlet enter a sand washing system for treatment.
8. The method for producing gangue sand aggregate as claimed in claim 7, wherein:
In the screening processes of the step 2.1 and the step 3.2, water spraying is carried out by adopting a water spraying device (9);
In the step 2.1, the screening condition of the first screening equipment (4) is that the materials with the grain diameter of more than or equal to 31.5mm are output from a first large grain outlet, the materials with the grain diameter of less than or equal to 5mm are output from a first medium grain outlet, and the materials with the grain diameter of less than or equal to 31.5mm are output from a first small grain outlet;
In the step 2.3, the screening condition of the second screening equipment (6) is that the material with the particle size of less than or equal to 20mm is output from a second large granule outlet, the material with the particle size of less than or equal to 10mm is output from a second medium granule outlet, and the material with the particle size of less than or equal to 5mm is output from a second small granule outlet;
In the step 3.2, the screening condition of the sand making screening device (8) is that the material with the grain diameter of more than or equal to 5mm is output from a third large grain outlet, the material with the grain diameter of less than or equal to 3mm is output from a third medium grain outlet, and the material with the grain diameter of less than or equal to 3mm is output from a third small grain outlet.
9. The method for producing gangue sand aggregate as claimed in claim 8, wherein:
The coal washing system comprises the following steps of:
Step a1, sequentially treating materials output from a first small granule outlet through a first spiral sand washer (10) and a first fine sand recovery machine (11) to produce low-calorific-value coal with the particle size of 0-5mm, and discharging wastewater discharged from the first spiral sand washer (10) and the first fine sand recovery machine (11) into a wastewater treatment system for treatment;
Step a2, conveying the low-calorific-value coal to a low-calorific-value coal stacking shed (15) through a conveying mechanism for storage and delivery;
The sand washing system comprises the following steps of:
Step b1, part of materials output by a third medium grain outlet and materials output by a third small grain outlet are sequentially processed by a second spiral sand washer (12) and a second fine sand recycling machine (13) to produce machine-made sand products with the grain diameter of 0-5mm, and wastewater discharged by the second spiral sand washer (12) and the second fine sand recycling machine (13) is discharged into a wastewater treatment system for treatment;
Step b2, conveying the machine-made sand products to a machine-made sand stacking shed (19) for storage and delivery through a conveying mechanism;
the wastewater treatment system comprises the following treatment steps:
Step c1, after wastewater generated by the coal washing system and the sand washing system enters a wastewater pool (21) through self-flow, the wastewater is conveyed to a thickener (22) for sedimentation separation treatment;
Step c2, conveying clear water on the upper layer of the thickener (22) to a clear water tank (24), pumping thick slurry at the bottom of the thickener (22) to a filter press workshop through a slurry pump to further remove water, conveying mud cakes produced by a filter press (23) to a coal mud stacking shed (20) or shipping from a factory, and conveying clear water discharged by the filter press (23) to the clear water tank (24);
And step c3, supplying water to the water spraying device (9) by the clean water tank (24) to realize the cyclic utilization of water resources.
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| CN116099595A (en) * | 2023-03-06 | 2023-05-12 | 成都市新力设备制造有限责任公司 | Technological system for preparing sand from coal gangue |
| CN117282536A (en) * | 2023-11-14 | 2023-12-26 | 海南星界和光科技有限公司 | Comprehensive utilization method of coal gangue |
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| CN113245200A (en) * | 2021-06-16 | 2021-08-13 | 许泽胜 | Method for preparing sandstone aggregate by selective crushing of coal gangue |
| CN115445741A (en) * | 2022-05-31 | 2022-12-09 | 福建工程学院 | A method for producing machine-made sand with high yield from rock waste |
| CN118022969A (en) * | 2024-03-26 | 2024-05-14 | 太原理工大学 | Method for classifying and classifying coal gangue |
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| CN116099595A (en) * | 2023-03-06 | 2023-05-12 | 成都市新力设备制造有限责任公司 | Technological system for preparing sand from coal gangue |
| CN117282536A (en) * | 2023-11-14 | 2023-12-26 | 海南星界和光科技有限公司 | Comprehensive utilization method of coal gangue |
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