CN109647609B - Initial clean treatment process for raw coal - Google Patents
Initial clean treatment process for raw coal Download PDFInfo
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- CN109647609B CN109647609B CN201910033528.1A CN201910033528A CN109647609B CN 109647609 B CN109647609 B CN 109647609B CN 201910033528 A CN201910033528 A CN 201910033528A CN 109647609 B CN109647609 B CN 109647609B
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- raw coal
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- gangue
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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
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
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- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention discloses a clean processing technology for the initial stage of raw coal, which relates to the field of raw coal processing and comprises the following steps: step 1, raw coal is fed; step 2, primary magnetic screening of raw coal; step 3, primary grading of raw coal; step 4, performing primary roughing on gangue, uniformly conveying the oversize product obtained in the step 3 on conveying equipment, and controlling a pushing device to push the gangue in the oversize product to a buffer zone in the conveying process; step 5, primary crushing; step 6, magnetic screening and grading are carried out again; and 7, crushing again. The invention has the advantages that when raw coal is fed, the raw coal is heated, dried, unfrozen and the moisture in the raw coal is removed while the uniform feeding is ensured, and the raw coal caking is broken up, thereby facilitating the subsequent screening of the raw coal; the method is more labor-saving and convenient in gangue roughing, reduces the labor intensity of workers, finally realizes two-time iron removal and two-time crushing on the raw coal by the whole process, and improves the quality of the finally crushed raw coal.
Description
Technical Field
The invention relates to the field of raw coal processing, in particular to a raw coal initial-stage cleaning treatment process.
Background
The raw coal refers to coal obtained by screening and processing crude coal mined from the ground or underground to remove gangue, pyrite and the like, and comprises natural coke and inferior coal, and does not comprise low-calorific-value coal (such as stone coal, peat, oil shale and the like); raw coal can be divided into humus coal, humus peat and humus peat according to the formation reason; it can be divided into peat, lignite, bituminous coal and anthracite according to its carbonization degree.
The raw coal usually contains impurities such as gangue, the impurities such as the gangue are usually required to be selected in the raw coal treatment process, the existing treatment basically adopts a manual operation mode to pick up the gangue impurities from a conveying belt, but the processing method has high labor intensity for workers because some gangue has large volume and large mass and the conveying belt is wide.
Disclosure of Invention
The invention aims to provide a clean treatment process for the initial stage of raw coal, which has the advantages of saving more labor and being more convenient when gangue is selected in the raw coal treatment process and reducing the labor intensity of workers.
The technical purpose of the invention is realized by the following technical scheme:
an initial cleaning treatment process for raw coal, which is characterized by comprising the following steps:
step 2, primary magnetic screening of raw coal: carrying out primary separation on iron-containing impurities in the raw coal subjected to the feeding in the step 1 through magnetic screening;
step 3, primary classification of raw coal: screening the raw coal processed in the step 2 into coarse oversize products and coarse undersize products, wherein the raw coal with the particle size of 0-50mm is the coarse undersize products, and the rest raw coal is the coarse oversize products;
step 4, performing primary rough gangue selection: uniformly conveying the oversize products obtained in the step 3 on conveying equipment, and controlling a pushing device to push the gangue in the oversize products to a buffer zone in the conveying process;
step 5, primary crushing, namely performing primary crushing on the other oversize products except the gangue in the step 4 to obtain crushed products;
step 6, carrying out secondary magnetic screening and secondary classification on the crushed material after primary crushing in the step 5, obtaining a coarse screening undersize material with the particle size of 0-50mm after secondary classification, and mixing the coarse screening undersize material obtained in the step with the coarse screening undersize material obtained after primary classification of the raw coal in the step 3 to obtain a substance A;
and 7, crushing the raw coal except the coarse screen underflow after the classification in the step 6 again, and mixing the crushed raw coal with the substance A in the step 6.
Through the technical scheme, the raw coal blocks frozen into a whole are thawed by heating before raw material feeding, then the raw coal blocks are separated by scattering, the water in the raw coal blocks is further evaporated, the subsequent screening is convenient, then the iron-containing impurities in the raw coal are preliminarily separated, the purity of the raw coal is improved, then the raw coal is classified, the raw coal with qualified particle size, namely the undersize material, is separated from the raw coal with larger particle size, namely the oversize material, the gangue in the oversize material is pushed by a pushing device, the selection and separation of the gangue in the raw coal are realized, then the oversize material is crushed, the crushed coarse screening material is subjected to magnetic screening again, the iron impurities are further removed, then the crushed material is crushed again, the iron removal is finally realized twice for the raw coal, the crushing is carried out twice, the iron impurities in the raw coal are removed more cleanly, and more raw coal with the particle size can enter the subsequent process, so that the quality of the finally crushed raw coal is improved, and the subsequent fine processing is facilitated.
The invention is further configured to: the primary conveying equipment in the step 1 comprises a conveying belt, the ground is concave up and down to form a material pouring pit, one end of the conveying belt is located in the material pouring pit, and the other end of the conveying belt is located above the heating feeding equipment.
Through above-mentioned technical scheme, during the use, directly shovel subaerial raw coal to the conveyer belt with the forklift, then raw coal heats in transporting to heating feeder equipment through the conveyer belt.
The invention is further configured to: the scattering, heating and feeding equipment in the step 1 comprises a heating cylinder, wherein an electric heating wire is wound around the outer side of the heating cylinder, one end of the heating cylinder is connected with a feeding hopper, the other end of the heating cylinder is provided with a discharging hole, and the feeding hopper is positioned below the conveying belt;
the heating cylinder internal rotation is connected with spiral conveying roller, spiral conveying roller includes roller and multisection mutual interval and follows the helix and encircle in the helical blade of roller, the one end of roller extends and wears out the feeder hopper is connected with drive roll axle pivoted actuating mechanism.
Through above-mentioned technical scheme, on throwing into the spiral conveying roller with the raw coal from the one end of cartridge heater, the electric heat wire heats the cartridge heater to can heat the raw coal, meanwhile, the raw coal advances the even conveying that carries out of spiral conveying roller, and break up through each helical blade's both ends, thereby when having realized the even material loading of raw coal, the moisture in the raw coal is unfrozen and gets rid of in the heating stoving, and breaks up the raw coal caking, the screening of the follow-up raw coal of being convenient for.
The invention is further configured to: and 4, the conveying equipment comprises a conveying belt device, the conveying belt device comprises a machine body, a conveying belt positioned on the machine body and limiting plates positioned at the edges of two sides of the conveying belt, the limiting plates are detachably connected with the machine body, and the length of each limiting plate is arranged along the length direction of the conveying belt.
Through adopting above-mentioned technical scheme, the setting of limiting plate can carry out certain the blockking to the raw coal on the conveyer belt, prevents that it breaks away from with the conveyer belt in the transportation.
The invention is further configured to: in the step 4, the pushing device comprises a buffer plate hinged with one side of the machine body, a push plate correspondingly arranged on the other side of the machine body and a push plate for driving the push plate to move towards or away from the buffer plate, wherein the push plate is connected with the driving piece, and the driving piece is connected with the machine body;
the driving piece is a hydraulic system, and the push plate is an arc-shaped plate which is close to the protrusion of the driving piece.
Through adopting above-mentioned technical scheme, the in-process of conveying raw coal on the conveyer belt, when the discovery has the waste rock on the conveyer belt, control driving piece promotes the push pedal and moves towards being close to the buffer board direction, with waste rock propelling movement to the buffer board on, the workman is direct selects the waste rock on the buffer board, then directly promotes the waste rock and falls in waste rock slide 6, whole in-process need not carry out the manual work with the waste rock on the conveyer belt and selects the transport, reduces workman's intensity of labour. The setting of arc can be more stable and accurate to the promotion of waste rock, both can reduce the promotion volume to the raw coal, can play certain limiting displacement to the waste rock in the arc moreover, reduces its possibility that breaks away from the promotion orbit. And the articulated of buffer board and organism makes and can overturn to the conveyer belt again along with the former coal that the gangue was pushed to on the buffer board, carries out follow-up operation.
The invention is further configured to: the push pedal is followed conveyer belt transmission direction's upper reaches one end is connected with stock stop, stock stop include with organism articulated first baffle and with push pedal articulated second baffle, first baffle with the second baffle slides and is connected, the push pedal is in when on the buffer board, first baffle and second baffle form the baffle and block to the material on the conveyer belt.
Through adopting above-mentioned technical scheme, the in-process that promotes the waste rock is carried out at the push pedal, the push pedal slides and drives the second baffle and slide along first baffle, the second baffle is towards being close to the motion of buffer board direction, first baffle blocks the raw coal of conveying on the conveyer belt with the second baffle, prevent promoting the baffle in-process, there is the waste rock to transport away thereupon on the conveyer belt, also can prevent that the thrust plate has waste rock or raw coal to be extruded to between push pedal and the limiting plate when sliding towards keeping away from the buffer board direction under the pneumatic cylinder effect.
The invention is further configured to: the heating temperature in step 1 is 40-55 ℃.
Through above-mentioned technical scheme, the heating temperature that sets up can reach the stoving effect of unfreezing to the raw coal and avoid the high temperature of raw coal outside.
The invention is further configured to: step 4 comprises the following steps:
a, screening the oversize material of the coarse screen into primary raw coal, secondary raw coal and tertiary raw coal in sequence according to the particle size from small to large;
and b, uniformly conveying the primary raw coal, the secondary raw coal and the tertiary raw coal respectively, and performing primary gangue rough separation operation respectively and then performing the step 5 respectively.
Through above-mentioned technical scheme, classify the coarse screen material of going up once more to the coarse picking of the waste rock of being convenient for avoids the different raw coals of particle diameter to pile up each other when the conveying, influences the selection of waste rock, guarantees the quality of coarse picking.
The invention is further configured to: in the step 4, the particle size of the primary raw coal is 50-80mm, the particle size of the secondary raw coal is 80-110mm, and the particle size of the tertiary raw coal is larger than 110 mm.
Through adopting above-mentioned technical scheme, carry out the breakage respectively with the raw coal that the particle size is different, make things convenient for broken work more.
In conclusion, the invention has the following beneficial effects:
1. the method comprises the steps of heating raw materials before feeding, unfreezing raw coal agglomerates which are frozen into a whole, then separating the raw coal agglomerates after scattering, further evaporating water in the raw coal agglomerates to facilitate subsequent screening, then primarily separating iron-containing impurities in the raw coal to improve the purity of the raw coal, then classifying the raw coal, separating raw coal with qualified particle size, namely a coarse screen underflow from raw coal with larger particle size, namely a coarse screen overflow, pushing gangue in the coarse screen overflow through a pushing device to realize selection and separation of gangue in the raw coal, reducing the labor intensity of workers in the process, crushing the coarse screen overflow, performing magnetic screening again on the crushed coarse screen overflow, further removing the iron impurities, then crushing again after classification again, finally removing iron and crushing twice on the raw coal, the iron impurities in the raw coal are removed more completely, more raw coal with the particle size can enter a subsequent process, the quality of the finally crushed raw coal is improved, and the subsequent fine processing is facilitated;
2. put into the spiral conveying roller with the raw coal on from the one end of cartridge heater, the electric heat silk heats the cartridge heater to can heat the raw coal, meanwhile, the raw coal advances the even conveying that carries on of spiral conveying roller, and breaks up through each helical blade's both ends, thereby when having realized the even material loading of raw coal, the moisture in the raw coal is unfrozen and gets rid of in the heating stoving, and breaks up the raw coal caking, the screening of the follow-up raw coal of being convenient for.
3. The coarse screen material is graded again, so that the gangue can be roughly picked conveniently, the situation that the raw coal with different particle sizes is stacked when being conveyed to influence the selection of the gangue is avoided, and the rough picking quality is guaranteed.
Drawings
FIG. 1 is a schematic structural view of a scattering heating feeder in the embodiment;
FIG. 2 is a schematic structural view of a belt conveyor embodying the embodiment;
fig. 3 is a schematic structural diagram of the stock stop device in the embodiment;
fig. 4 is a schematic diagram showing a connection relationship between the first baffle and the second baffle in the embodiment.
In the figure, 1, a heating cylinder; 11. a feed hopper; 12. a discharge port; 13. a thermal insulation sleeve; 14. heating wires; 2. a spiral conveying roller; 21. a roll shaft; 22. a helical blade; 23. a drive mechanism; 3. a conveyor means; 31. a body; 32. a conveyor belt; 4. a material pushing device; 41. a drive member; 42. pushing the plate; 5. a buffer plate; 6. a gangue slide way; 7. a material blocking device; 71. a first baffle plate; 711. a T-shaped chute; 72. a second baffle; 73. a slipping component; 731. a T-shaped slider; 8. a limiting plate; 81. a first notch; 82. a second notch.
Detailed Description
Example (b): an initial cleaning process for raw coal, as shown in fig. 1, comprises the following steps:
step 2, primary magnetic screening of raw coal: carrying out primary separation on iron-containing impurities in the raw coal subjected to the feeding in the step 1 through magnetic screening; step 3, primary classification of raw coal: the separation of different raw coals of particle size is realized through high frequency straight line sieve, and the specific operation is: screening the raw coal processed in the step 2 through a screen with the aperture of 50mm, screening the raw coal into coarse screening lower materials with the particle size of 0-50mm, and remaining coarse screening upper materials;
step 4, performing primary rough gangue selection: the method comprises the following steps:
a, sieving the oversize product obtained in the step 3 again through a screen, and dividing the oversize product into primary raw coal with the particle size of 50-80mm, secondary raw coal with the particle size of 80-110mm and tertiary raw coal with the particle size of more than 110 mm;
b, respectively putting the primary raw coal, the secondary raw coal and the tertiary raw coal on different conveying belts, uniformly paving the raw coal and slowly conveying the raw coal to finish the respective conveying, and then selecting and separating gangue in the primary raw coal, the secondary raw coal and the tertiary raw coal by controlling the material pushing device 4 to respectively perform the next step;
step 5, primary crushing, namely performing primary crushing on the other oversize products except the gangue in the step 4 to obtain crushed products;
step 6, carrying out secondary magnetic screening and secondary classification on the crushed material after primary crushing in the step 5, obtaining a coarse screening undersize material with the particle size of 0-50mm after secondary classification, and mixing the coarse screening undersize material obtained in the step with the coarse screening undersize material obtained after primary classification of the raw coal in the step 3 to obtain a substance A;
and 7, crushing the raw coal except the coarse screen underflow after the classification in the step 6 again, and mixing the crushed raw coal with the substance A in the step 6.
The primary conveying equipment in the step 1 comprises a conveying belt, the ground is concave up and down to form a material pouring pit, one end of the conveying belt is located in the material pouring pit, and the other end of the conveying belt is located above the heating feeding equipment. When the coal shoveling device is used, the forklift is directly used for shoveling the raw coal on the ground onto the conveyor belt, and then the raw coal is conveyed into the heating and feeding equipment through the conveyor belt for heating.
The scattering, heating and feeding device in the step 1 comprises a heating cylinder 1, wherein one end of the heating cylinder 1 is fixedly connected with a feed hopper 11, and the other end of the heating cylinder 1 is provided with a discharge hole 12. The internal rotation of cartridge heater 1 is connected with spiral conveying roller 2, spiral conveying roller 2 includes the roller 21 and the multisection mutual interval of 1 coaxial line with the cartridge heater and encircles in the helical blade 22 of roller 21 along the helix, helical blade 22's the equal butt in the inside wall of cartridge heater 1 in the outside, the one end of roller 21 extends to in the feeder hopper 11 and wears to establish the feeder hopper 11 and keep away from one side of cartridge heater 1, the one end that roller 21 extends feeder hopper 11 still is provided with can drive roller 21 pivoted actuating mechanism 23, actuating mechanism 23 that adopts in this embodiment is driving motor.
The outside cover of cartridge heater 1 is equipped with insulation support 13, is provided with the heater strip 14 that the cover was located the cartridge heater 1 outside between insulation support 13 and the cartridge heater 1, and the one end of heater strip 14 extends the one end and the fixedly connected with wire of insulation support 13 and cartridge heater 1, and the other end fixedly connected with power of wire. The during operation, drop into the raw coal in the hopper down, then, actuating mechanism 23 drives roller 21 and rotates, thereby it rotates to drive spiral conveying roller 2, thereby can be through helical blade 22 with the raw coal in the hopper down along even conveying in the cartridge heater 1, in the data send process, the electric heat silk heats cartridge heater 1, thereby can heat the raw coal, meanwhile, the both ends of each helical blade 22 are broken up the raw coal caking along with rotating, thereby when having realized the even material loading of raw coal, the moisture in the raw coal is unfrozen and got rid of in the heating drying, and break up the raw coal caking, the screening of the follow-up raw coal of being convenient for.
As shown in fig. 2, the conveying device in step 4 includes a conveyor belt device 3 for conveying the raw coal obtained from the high-frequency linear sieve to the crushing device, the conveyor belt device 3 includes a body 31 and a conveyor belt 32 on the body 31, in order to prevent the raw coal on the conveyor belt 32 from separating from the conveyor belt 32 and sliding off from two sides of the conveyor belt 32, limiting plates 8 for blocking the raw coal are further disposed on two sides of the conveyor belt 32, the limiting plates 8 are detachably connected to the body 31, and the length of the limiting plates 8 is set along the length direction of the conveyor belt 32. The arrangement of limiting plate 8 can carry out certain the blockking to the raw coal on conveyer belt 32, prevents that it from breaking away from with conveyer belt 32 in the transportation.
As shown in fig. 3, the material pushing device 4 in step 4 includes a buffer plate 5 hinged to one side of the machine body 31, a push plate 42 correspondingly disposed on the other side of the machine body 31, and a driving member 41 for driving the push plate 42 to move toward or away from the buffer plate 5, wherein the push plate 42 is connected to the driving member 41, and the driving member 41 is connected to the machine body 31. Buffer board 5 below is provided with the waste rock slide 6 of collecting the waste rock, and driving piece 41 is pneumatic cylinder or common hydraulic system, and the pneumatic cylinder is explained as the example to this embodiment, is close to the limiting plate 8 of buffer board 5 one side and offers and supplies the raw coal to promote the first breach 81 on the buffer board 5, and the gliding second breach 82 of piston rod that supplies the pneumatic cylinder is offered to the limiting plate 8 of keeping away from buffer board 5 one side.
The push plate 42 is fixedly connected with a piston rod of the hydraulic cylinder, and the push plate 42 is positioned above the conveyer belt 32, of course, the distance between the push plate 42 and the conveyer belt 32 is small, which neither influences the conveying of the conveyer belt 32 nor influences the pushing of the push plate 42 to the gangue on the conveyer belt 32. When the push plate 42 is a horizontal plate, if the push plate 42 is too short in the horizontal direction, the push plate 42 pushes the in-process, the gangue easily breaks away from the push plate 42, the pushing effect on the gangue is lost, if the push plate 42 is too long in the horizontal direction, the one-time conveying amount of the raw coal on the conveying belt 32 is too large, the amount of the rest of the coal except the gangue is also increased, the pushing effect is reduced, and therefore the push plate 42 is set to be an arc-shaped plate protruding towards the driving member 41.
The setting of arc can be more stable and accurate to the promotion of waste rock, both can reduce the promotion volume to the raw coal, can play certain limiting displacement to the waste rock in the arc moreover, reduces its possibility that breaks away from the promotion orbit. When the push plate 42 is the arc, move towards keeping away from 5 directions of buffer board under the pneumatic cylinder effect as the push plate 42, when the arc was most peripheral and limiting plate 8 butt, can have raw coal between arc and limiting plate 8 this moment, even when the push plate 42 was to keeping away from push plate 42 direction motion, can directly extrude part raw coal between push plate 42 and limiting plate 8, so connect stock stop 7 at push plate 42 along the upstream one end of conveyer belt 32 transmission direction, stock stop 7 includes first baffle 71 articulated with organism 31 and the second baffle 72 articulated with push plate 42, first baffle 71 slides through subassembly 73 with the second baffle 72 and is connected.
In the process that the pushing plate 42 pushes the gangue, the pushing plate 42 slides to drive the second baffle plate 72 to slide along the first baffle plate 71, the second baffle plate 72 moves towards the direction close to the buffer plate 5, the first baffle plate 71 and the second baffle plate 72 block raw coal conveyed on the conveying belt 32, the situation that the gangue is conveyed away from the conveying belt 32 along with the gangue is prevented in the pushing plate 42 pushing process, and the gangue or the raw coal is extruded between the pushing plate 42 and the limiting plate 8 when the pushing plate 42 slides towards the direction far away from the buffer plate 5 under the action of the hydraulic cylinder can also be prevented.
As shown in fig. 4, the sliding assembly 73 includes a T-shaped sliding block 731 fixedly connected to one side of the second baffle plate 72 close to the first baffle plate 71, a T-shaped sliding slot 711 for sliding the T-shaped sliding block 731 is formed in one side of the first baffle plate 71 close to the second baffle plate 72, specifically, the T-shaped sliding slot 711 includes a first sliding slot with a slot opening toward the second baffle plate 72 and a second sliding slot with a slot opening toward a bottom of the first sliding slot, and an inner diameter of the second sliding slot is greater than an inner diameter of the first sliding slot. A positioning plate for limiting the T-shaped sliding block 731 is arranged on the notch of the T-shaped sliding groove 711 at one side close to the buffer plate 5. With such an arrangement, the first baffle 71 and the second baffle 72 can slide relatively, and the second baffle 72 can be prevented from being separated from the first baffle 71 after sliding.
The buffer plate 5 is hinged to the body 31 at its edge, considering that the raw coal pushed onto the buffer plate 5 contains gangue and there is also coal that needs to be transferred to the subsequent process. So set up for along with the waste rock is pushed the remaining coal except waste rock on the buffer board 5 and can overturn to the conveyer belt 32 again, carries out follow-up operation.
The process has the advantages that: the method comprises the steps of heating raw materials before feeding, unfreezing raw coal agglomerates which are frozen into a whole, then scattering and separating the raw coal agglomerates, further evaporating water in the raw coal agglomerates to facilitate subsequent screening, then primarily separating iron-containing impurities in the raw coal to improve the purity of the raw coal, then classifying the raw coal, separating coarse screened waste, namely the coarse screened waste, with larger particle size from the raw coal, namely the coarse screened waste, pushing gangue in the coarse screened waste through a pushing device 4 to select and separate gangue in the raw coal, reducing the labor intensity of workers in the process, crushing the coarse screened waste, performing magnetic screening again on the crushed coarse screened waste, further removing iron impurities, then crushing again after classification, finally removing iron twice for the raw coal, crushing twice, and removing iron impurities from the raw coal more cleanly, and more raw coal with the particle size can enter the subsequent process, so that the quality of the finally crushed raw coal is improved, and the subsequent fine processing is facilitated.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (7)
1. An initial cleaning treatment process for raw coal, which is characterized by comprising the following steps:
step 1, raw coal feeding: conveying the raw coal into a scattering and heating feeding device through a primary conveying device, heating and scattering the raw coal, and completing conveying to realize raw coal feeding;
step 2, primary magnetic screening of raw coal: carrying out primary separation on iron-containing impurities in the raw coal subjected to the feeding in the step 1 through magnetic screening;
step 3, primary classification of raw coal: screening the raw coal processed in the step 2 into coarse oversize products and coarse undersize products, wherein the raw coal with the particle size of 0-50mm is the coarse undersize products, and the rest raw coal is the coarse oversize products;
step 4, performing primary rough gangue selection: uniformly conveying the oversize products obtained in the step 3 on conveying equipment, and controlling a material pushing device (4) to push the gangue in the oversize products to a buffer zone in the conveying process;
the conveying device in the step 4 comprises a conveying belt device (3), the conveying belt device (3) comprises a machine body (31) and a conveying belt (32) located on the machine body (31), the material pushing device (4) comprises a buffer plate (5) hinged to one side of the machine body (31), a push plate (42) correspondingly arranged on the other side of the machine body (31) and a push plate (42) driving the push plate (42) to move towards or away from the buffer plate (5), the push plate (42) is connected with a driving piece (41), and the driving piece (41) is connected with the machine body (31);
the driving part (41) is a hydraulic system, and the push plate (42) is an arc-shaped plate protruding towards the driving part (41);
one end of the push plate (42) at the upstream along the transmission direction of the conveyor belt (32) is connected with a material blocking device (7), the material blocking device (7) comprises a first baffle (71) hinged with the machine body (31) and a second baffle (72) hinged with the push plate (42), the first baffle (71) is connected with the second baffle (72) in a sliding manner, and when the push plate (42) is positioned on the buffer plate (5), the first baffle (71) and the second baffle (72) form a partition plate to block materials on the conveyor belt (32);
step 5, primary crushing, namely performing primary crushing on the other oversize products except the gangue in the step 4 to obtain crushed products;
step 6, carrying out secondary magnetic screening and secondary classification on the crushed material after primary crushing in the step 5, obtaining a coarse screening undersize material with the particle size of 0-50mm after secondary classification, and mixing the coarse screening undersize material obtained in the step with the coarse screening undersize material obtained after primary classification of the raw coal in the step 3 to obtain a substance A;
and 7, crushing the raw coal except the coarse screen underflow after the classification in the step 6 again, and mixing the crushed raw coal with the substance A in the step 6.
2. The initial cleaning treatment process of raw coal as claimed in claim 1, which is characterized in that: in the step 1, the primary conveying equipment comprises a conveying belt, the ground is concave up and down to form a material pouring pit, one end of the conveying belt is located in the material pouring pit, and the other end of the conveying belt is located above the scattering and heating feeding equipment.
3. The initial cleaning treatment process of raw coal as claimed in claim 2, which is characterized in that: the scattering, heating and feeding equipment in the step 1 comprises a heating cylinder (1), wherein an electric heating wire is wound around the outer side of the heating cylinder (1), one end of the heating cylinder (1) is connected with a feeding hopper (11), the other end of the heating cylinder is provided with a discharging hole (12), and the feeding hopper (11) is positioned below a conveying belt of the conveying equipment;
the spiral conveying roller (2) is connected to the internal rotation of cartridge heater (1), spiral conveying roller (2) include roller (21) and multisection interval each other and along helical line encircle in helical blade (22) of roller (21), the one end of roller (21) is extended and is worn out feeder hopper (11) are connected with drive roller (21) pivoted actuating mechanism (23).
4. The initial cleaning treatment process of raw coal as claimed in claim 1, which is characterized in that: the conveyer belt device (3) further comprises limiting plates (8) located at edges of two sides of the conveyer belt (32), the limiting plates (8) are detachably connected with the machine body (31), and the length of each limiting plate (8) is arranged along the length direction of the conveyer belt (32).
5. The initial cleaning treatment process of raw coal as claimed in claim 1, which is characterized in that: the heating temperature in step 1 is 40-55 ℃.
6. The initial cleaning treatment process of raw coal as claimed in claim 1, which is characterized in that: step 4 comprises the following steps:
a, screening the coarse screen material obtained in the step 3 into primary raw coal, secondary raw coal and tertiary raw coal in sequence according to the particle size from small to large;
and b, uniformly conveying the primary raw coal, the secondary raw coal and the tertiary raw coal respectively, and performing primary gangue rough separation operation respectively and then performing the step 5 respectively.
7. The initial cleaning treatment process of raw coal as claimed in claim 6, which is characterized in that: in the step 4, the particle size of the primary raw coal is 50-80mm, the particle size of the secondary raw coal is 80-110mm, and the particle size of the tertiary raw coal is larger than 110 mm.
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Citations (7)
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| EP0700875A2 (en) * | 1994-09-09 | 1996-03-13 | EVV-Vermögensverwaltungs-GmbH | Method and apparatus for continuous solubilizing of organic compounds of a flowable material containing insoluble inorganic compounds |
| RU63253U1 (en) * | 2007-01-09 | 2007-05-27 | ОАО "Машиностроительный концерн ОРМЕТО-ЮУМЗ" | PLANT FOR GRINDING BULK MATERIAL |
| CN102319619A (en) * | 2011-09-13 | 2012-01-18 | 山东新矿赵官能源有限责任公司 | Graded washing process for raw coal |
| CN202272936U (en) * | 2011-09-10 | 2012-06-13 | 鞍钢股份有限公司 | Material distributing device |
| CN204416598U (en) * | 2014-12-17 | 2015-06-24 | 天津市双象工程液压件有限责任公司 | A kind of gangue pendulum-type device for discharging |
| CN106196953A (en) * | 2016-08-25 | 2016-12-07 | 安徽纽亚达科技有限责任公司 | Mineral dehydrator |
| CN207325018U (en) * | 2017-08-01 | 2018-05-08 | 淮南矿业(集团)有限责任公司 | Group coal dividing load and carry system |
-
2019
- 2019-01-14 CN CN201910033528.1A patent/CN109647609B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0700875A2 (en) * | 1994-09-09 | 1996-03-13 | EVV-Vermögensverwaltungs-GmbH | Method and apparatus for continuous solubilizing of organic compounds of a flowable material containing insoluble inorganic compounds |
| RU63253U1 (en) * | 2007-01-09 | 2007-05-27 | ОАО "Машиностроительный концерн ОРМЕТО-ЮУМЗ" | PLANT FOR GRINDING BULK MATERIAL |
| CN202272936U (en) * | 2011-09-10 | 2012-06-13 | 鞍钢股份有限公司 | Material distributing device |
| CN102319619A (en) * | 2011-09-13 | 2012-01-18 | 山东新矿赵官能源有限责任公司 | Graded washing process for raw coal |
| CN204416598U (en) * | 2014-12-17 | 2015-06-24 | 天津市双象工程液压件有限责任公司 | A kind of gangue pendulum-type device for discharging |
| CN106196953A (en) * | 2016-08-25 | 2016-12-07 | 安徽纽亚达科技有限责任公司 | Mineral dehydrator |
| CN207325018U (en) * | 2017-08-01 | 2018-05-08 | 淮南矿业(集团)有限责任公司 | Group coal dividing load and carry system |
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|---|---|
| CN109647609A (en) | 2019-04-19 |
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