CN113351362A - System and method for removing impurities from raw coal - Google Patents
System and method for removing impurities from raw coal Download PDFInfo
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- CN113351362A CN113351362A CN202110670888.XA CN202110670888A CN113351362A CN 113351362 A CN113351362 A CN 113351362A CN 202110670888 A CN202110670888 A CN 202110670888A CN 113351362 A CN113351362 A CN 113351362A
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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
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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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
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Abstract
The embodiment of the invention provides a system and a method for removing impurities from raw coal, wherein the system comprises: a pre-impurity removal device; the classifying screen is communicated with the pre-impurity removal device; the lump coal impurity removal device is communicated with the grading sieve; and the inspection impurity removal device is communicated with the grading sieve and the lump coal impurity removal device. The embodiment of the invention realizes the intellectualization and automation of impurity removal of the raw coal, has better pertinence to the treatment of impurities, is easy to ensure the impurity removal effect, has simple operation and maintenance process and low operation cost.
Description
Technical Field
The invention relates to the technical field of raw coal impurity removal, in particular to a system and a method for removing raw coal impurities.
Background
It is known that in the process of underground coal mining, a large amount of light impurities such as wood, rubber, woven bags and the like and iron impurities such as anchor rods, metal nets, steel bar ladders and the like are often mixed. After the impurities enter a production system of a coal preparation plant, the impurities not only cause the blockage of the system to influence the production, but also influence the quality of the final clean coal product. At present, iron sundries are treated by a plurality of treatment equipment and processes and are relatively mature, but light sundries in coal are treated by special treatment equipment rarely, and a coal separation plant is still provided with a manual selection belt at present and relies on manual selection to select and remove the light sundries. Such impurity removal mode is inefficient, staff intensity of labour is big, factor of safety is low, and still often there is the incomplete problem of debris processing, and this has seriously influenced the intelligent process of coal preparation plant.
Disclosure of Invention
The invention provides a system and a method for removing impurities from raw coal. The intelligent and automatic impurity removal of the raw coal is realized, the impurity removal effect is easy to guarantee, the operation and maintenance process is simple, and the operation cost is low.
To solve the above technical problem, an embodiment of the present invention provides the following solutions:
the invention provides a system for removing impurities from raw coal, which comprises:
a pre-impurity removal device;
the classifying screen is communicated with the pre-impurity removal device;
the lump coal impurity removal device is communicated with the grading sieve;
and the inspection impurity removal device is communicated with the grading sieve and the lump coal impurity removal device.
Optionally, the pre-impurity removal device includes:
the raw coal belt conveyor is provided with a raw coal feeding hole and a raw coal discharging hole;
and the first iron remover is fixedly connected with the upper part of the raw coal discharge hole, and a first sundry discharge hole is arranged below the first iron remover.
Optionally, the classifying screen comprises:
a classifying screen body;
a classifying screen feeding port arranged on the classifying screen body;
an oversize material outlet arranged on the classifying screen body;
and the screen underflow discharge port is arranged on the classifying screen body.
Optionally, the lump coal impurity removing device includes:
the shallow groove separator is provided with a feeding port, a light product discharge port, a heavy product discharge port and a water inlet;
the sundry dewatering screen is fixedly connected with a light product discharge port of the shallow groove separator, and a second sundry discharge port and a first screen water outlet are formed in the sundry dewatering screen;
the lump coal dewatering screen is fixedly connected with the heavy product discharge port of the shallow groove separator, and is provided with a lump coal discharge port and a second screen water outlet;
the circulating water bucket is fixedly connected with a first undersize water outlet of the sundry dewatering screen and a second undersize water outlet of the lump coal dewatering screen, and a clear water inlet, an undersize water inlet, a shunt outlet and a circulating water outlet are formed in the circulating water bucket;
one end of the slurry pump is fixedly connected with a circulating water outlet of the circulating water bucket, and the other end of the slurry pump is fixedly connected with a water inlet of the shallow slot separator.
Optionally, the size of the screen seam of the impurity dewatering screen and the lump coal dewatering screen is smaller than the grading particle size of the grading screen.
Optionally, the inspection impurity removing device includes:
the raw coal belt conveyor is fixedly connected with a screen underflow discharge port of the grading screen and a lump coal discharge port of the lump coal dewatering screen, and a raw coal feed port and a raw coal discharge port are formed in the raw coal belt conveyor;
and the second iron remover is fixedly connected with the upper part of the raw coal discharge hole, and a third sundry discharge hole is arranged below the second iron remover.
The invention provides a method for removing impurities from raw coal, which comprises the following steps:
obtaining raw coal to be purified;
performing primary treatment on the raw coal to be subjected to impurity removal sequentially through a pre-impurity removal device and a classifying screen to obtain first iron impurities, oversize products and undersize products;
sending the oversize products into a lump coal impurity removal device for secondary treatment to obtain dehydrated light impurities and dehydrated lump coal;
and sending the undersize products and the dehydrated lump coal into an inspection impurity removal device for three-stage treatment to obtain second iron impurities and raw coal.
Optionally, the coarse coal to be subjected to impurity removal is sequentially subjected to primary treatment through a pre-impurity removal device and a classifying screen to obtain first iron impurities, oversize products and undersize products, and the method comprises the following steps:
conveying the crude coal to be subjected to impurity removal into a first iron remover through a crude coal belt conveyor for iron removal treatment to obtain crude coal subjected to iron removal and first iron impurities, and discharging the first iron impurities through a first impurity discharge hole;
and sending the crude coal after iron removal into a classifying screen for classification treatment to obtain oversize products and undersize products, wherein the oversize products are output to a lump coal impurity removal device through an oversize product discharge port, and the undersize products are output to an inspection impurity removal device through an undersize product discharge port.
Optionally, the oversize material is sent into a lump coal impurity removal device for secondary treatment to obtain dehydrated light impurities and dehydrated lump coal, and the method comprises the following steps:
providing pulse water flow to the shallow slot separator through a slurry pump, and carrying out light impurity treatment on oversize products to obtain non-dehydrated light impurities and non-dehydrated lump coal;
dehydrating the non-dehydrated light impurities through an impurity dehydrating screen to obtain dehydrated light impurities and first screened water; and dehydrating the undehydrated lump coal through a lump coal dehydration sieve to obtain dehydrated lump coal and second screen water.
Optionally, the undersize material and the dehydrated lump coal are sent to an inspection impurity removal device for tertiary treatment to obtain a second iron impurity and raw coal, including:
feeding the undersize product and the dehydrated lump coal into a raw coal belt conveyor;
and sending the undersize product and the dehydrated lump coal into a second iron remover for iron removal treatment through the raw coal belt conveyor to obtain second iron impurities and raw coal.
The scheme of the invention at least comprises the following beneficial effects:
the above scheme of the present invention includes: a pre-impurity removal device; the classifying screen is communicated with the pre-impurity removal device; the lump coal impurity removal device is communicated with the grading sieve; and the inspection impurity removal device is communicated with the grading sieve and the lump coal impurity removal device. Light impurities are treated by using a water medium separation device, and iron impurities are treated by arranging iron removers at the head and the tail of a system for removing impurities from raw coal, so that the treatment of the impurities is more targeted, and the impurity removal effect is easy to ensure; the impurity removal and separation precision is easy to guarantee by using main selection equipment commonly used in coal preparation plants, the separation density is low, impurity separation can be realized without weighting a medium, a secret control system is not required, the operation and maintenance are simple, and the operation cost is low; the manual hand-picking and impurity-picking of the common coal preparation plant in the prior art are replaced by mechanization, so that the automation and the intellectualization of the coal preparation plant are realized.
Drawings
FIG. 1 is a schematic structural diagram of a raw coal impurity removal system according to an embodiment of the invention;
FIG. 2 is a schematic flow chart of a method for removing impurities from raw coal according to an embodiment of the invention;
description of reference numerals:
1-a pre-impurity removal device; 2-grading sieve; 3-lump coal impurity removal device; 4-checking and impurity removing devices; 11-a raw coal belt conveyor; 12-a first de-ironing separator; 21-a classifying screen body; 22-a classifying screen feeding port; 23-oversize discharge port; 24-undersize discharge port; 31-shallow slot sorting machine; 32-impurity dewatering screen; 33-lump coal dewatering screen; 34-a circulating water tank; 35-a slurry pump; 41-raw coal belt conveyor; 42-a second iron remover; 111-raw coal feed inlet; 112-raw coal discharge port; 121-a first sundry discharge port; 311-a feeding port; 312-light product outlet; 313-heavy product discharge port; 314-water inlet; 321-a second sundry discharge port; 322-first screen outlet; 331-lump coal discharge port; 332-a second undersize water outlet; 341-clear water inlet; 342-inlet for sifting water; 343-a partial flow outlet; 344-circulating water outlet; 411-raw coal feed inlet; 412-raw coal discharge; 421-a third sundry discharge port.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in FIG. 1, the invention provides a system for removing impurities from raw coal, comprising:
a pre-impurity removal device 1;
the classifying screen 2 is communicated with the pre-impurity removal device 1;
the lump coal impurity removal device 3 is communicated with the grading sieve 2;
and the inspection impurity removal device 4 is communicated with the grading sieve 2 and the lump coal impurity removal device 3.
In this embodiment, in advance edulcoration device 1 is arranged in carrying the raw coal to classifying screen 2 in grades, wherein in advance edulcoration device 1 can realize the first deironing of raw coal and handle, the iron debris after handling can recycle, the raw coal that gets into classifying screen 2 can be graded, oversize passes through lump coal edulcoration device 3 and handles into lump coal and light debris, wherein light debris can recycle or abandonment, lump coal joins at inspection edulcoration device 4 with classifying screen undersize, carry out the deironing of second time in inspection edulcoration device 4, the iron debris after handling can recycle, finally obtain the raw coal after the edulcoration.
As shown in fig. 1, in an alternative embodiment of the present invention, the pre-impurity removal device 1 includes:
a raw coal belt conveyor 11, wherein a raw coal feed port 111 and a raw coal discharge port 112 are arranged on the raw coal belt conveyor 11;
and a first iron remover 12 fixedly connected with the upper part of the raw coal discharge port 112, and a first sundry discharge port 121 is arranged below the first iron remover 12.
In this embodiment, the preliminary impurity removal device 1 includes a raw coal belt conveyor 11 and a first iron remover 12, raw coal enters through a raw coal feed port 111 in the raw coal belt conveyor 11, the first iron remover 12 is fixedly connected above a raw coal discharge port 112 of the raw coal belt conveyor 11, when the raw coal is conveyed to the raw coal discharge port 112 through the raw coal belt conveyor 11, iron impurities are removed through the first iron remover 12, and then the raw coal enters the classifying screen 2, wherein the iron impurities removed by the first iron remover 12 can be recycled or discarded;
it should be noted that the first iron remover 12 preferably includes an electromagnetic iron remover and a permanent magnet iron remover.
In an alternative embodiment of the present invention, as shown in fig. 1, the classifying screen 2 includes:
a classifying screen body 21;
a classifying screen feeding port 22 arranged on the classifying screen body 21;
an oversize material outlet 23 arranged on the classifying screen body 21;
and a screen underflow outlet 24 provided on the classifying screen body 21.
In this embodiment, the classifying screen 2 includes a classifying screen body 21, a classifying screen feeding port 22, an oversize discharging port 23 and an undersize discharging port 24, the coarse coal after the first deironing treatment by the first deironing device 12 enters the classifying screen body 21 through the classifying screen feeding port 22 for classifying treatment, the coarse coal is classified by the classifying screen body 21 to obtain oversize and undersize, wherein the oversize is conveyed to the lump coal impurity removing device 3 through the oversize discharging port 23, the oversize is treated into lump coal and light impurities through the lump coal impurity removing device 3, and the undersize and lump coal of the classifying screen are merged and are subjected to secondary iron impurity removal treatment through the inspection impurity removing device 4.
It should be noted that a sorting system may be preferably provided between the classifying screen 2 and the inspection and impurity removal device 4, undersize products after the classifying treatment by the classifying screen 2 may be preferably sent to the sorting system, and undersize products after the processing by the sorting system and lump coal after the processing by the lump coal impurity removal device 3 are merged and sent to the inspection and impurity removal device 4 for processing.
In an alternative embodiment of the present invention, as shown in fig. 1, the lump coal impurity removing device 3 includes:
the shallow groove separator 31 is provided with a feeding port 311, a light product discharge port 312, a heavy product discharge port 313 and a water inlet 314 on the shallow groove separator 31;
the sundries dewatering screen 32 is fixedly connected with the light product discharge port 312 of the shallow slot separator 31, and a second sundries discharge port 321 and a first screened water outlet 322 are arranged on the sundries dewatering screen 32;
the lump coal dewatering screen 33 is fixedly connected with the heavy product discharge port 313 of the shallow slot separator 31, and a lump coal discharge port 331 and a second screened water outlet 332 are arranged on the lump coal dewatering screen 33;
a circulating water tank 34 fixedly connected with the first undersize water outlet 322 of the sundries dewatering screen 32 and the second undersize water outlet 332 of the lump coal dewatering screen 33, wherein the circulating water tank 34 is provided with a clean water inlet 341, an undersize water inlet 342, a diversion outlet 343 and a circulating water outlet 344;
and a slurry pump 35, one end of which is fixedly connected with the circulating water outlet 344 of the circulating water barrel 34, and the other end of which is fixedly connected with the water inlet 314 of the shallow groove separator 31.
In this embodiment, the lump coal impurity removal device 3 includes a shallow slot separator 31, an impurity dewatering screen 32, a lump coal dewatering screen 33, a circulating water tank 34, and a slurry pump 35, and it should be noted that the lump coal impurity removal device 3 may preferably further include a jigger;
specifically, the shallow groove separator 31 is provided with a feeding port 311, a light product discharge port 312, a heavy product discharge port 313 and a water inlet 314; materials on the screen of the classifying screen enter the shallow groove separator 31 through the material inlet 311 for impurity separation, the materials realize the separation of light impurities under the action of pulsating water flow provided by the slurry pump 35, wherein the pulsating water flow is preferably coal slime water, the pulsating water flow provided by the slurry pump 35 enters the shallow groove separator 31 through the water inlet 314, and the separated light impurities overflow out of the shallow groove separator 31 to the impurity dewatering screen 32 through the light product discharge port 312;
the overflowed light impurities are dehydrated through an impurity dehydrating screen 32 to obtain dehydrated light impurities and first screened water, and the dehydrated light impurities are discharged through a second impurity discharging port 321, wherein the dehydrated light impurities can be preferably discarded or recycled; the first screen water returns to the circulating water tank 34 through the first screen water outlet 322 for reuse;
discharging the material from which the light impurities are separated into a lump coal dewatering screen 33 through a heavy product discharge port 313 for dewatering treatment, and obtaining lump coal and second screen water after dewatering treatment, wherein the lump coal is discharged out of the lump coal dewatering screen 33 through a lump coal discharge port 331, and the second screen water returns to the circulating water tank 34 through a second screen water outlet 332 for reuse;
specifically, the screen seam size of the sundry dewatering screen 32 and the lump coal dewatering screen 33 is smaller than the classification particle size of the classifying screen 2.
In this embodiment, the classifying screen 2 preferably includes a vibrating screen, a fixed screen, a roller screen, and a fly-over screen, the impurity dewatering screen 32 preferably includes an impurity arc screen, a planar linear vibrating screen, and a fixed screen, and the lump coal dewatering screen 33 preferably includes an arc screen, a planar vibrating screen, and a banana screen, wherein the size of the screen gaps of the impurity dewatering screen 32 and the lump coal dewatering screen 33 is smaller than the classifying particle size of the classifying screen 2.
In a specific embodiment, the grading size of the grading screen 2 in the raw coal impurity removal system is 6mm to 50mm, and the size of the screen seam of the impurity dewatering screen 32 and the lump coal dewatering screen 33 is 0.5mm to 6 mm.
The circulating water bucket 34 is provided with a clean water inlet 341, a screen water inlet 342, a shunt outlet 343 and a circulating water outlet 344, wherein the circulating water outlet 344 conveys the slime water in the circulating water bucket 34 to the slurry pump 35, and the slurry pump 35 provides pulsating water flow to the shallow slot separator 31; the water inlet 342 for sieve receives the first sieve water discharged from the sundries dewatering screen 32 and the second sieve water discharged from the lump coal dewatering screen 33, and the clear water inlet 341 is used for replenishing clear water and/or purified circulating water; the diversion outlet 343 is used for delivering the slime water and/or the first undersize water and the second undersize water in the circulating water bucket 34 to the slime water treatment link, and the slime water concentration in the shallow slot separator 31 can be ensured to be in a proper range by adjusting the supplement amount of the clean water inlet 341 and the output amount of the diversion outlet 343;
it is noted that the suitable concentration of the slime water in the circulating water tank 34 is preferably less than and/or equal to 100 g/L.
In an alternative embodiment of the present invention, as shown in fig. 1, the inspection and impurity removal device 4 includes:
the raw coal belt conveyor 41 is fixedly connected with the undersize discharge port 24 of the classifying screen 2 and the lump coal discharge port 331 of the lump coal dewatering screen 33, and a raw coal feed port 411 and a raw coal discharge port 412 are arranged on the raw coal belt conveyor 41;
and the second iron remover 42 is fixedly connected with the raw coal discharge port 412, and a third impurity discharge port 421 is arranged on the second iron remover 42.
An embodiment of the invention comprises: a pre-impurity removal device 1; the classifying screen 2 is communicated with the pre-impurity removal device 1; the lump coal impurity removal device 3 is communicated with the grading sieve 2; and the inspection impurity removal device 4 is communicated with the grading sieve 2 and the lump coal impurity removal device 3. The intelligent and automatic impurity removal of the raw coal is realized, the impurity removal effect is easy to guarantee, the operation and maintenance process is simple, and the operation cost is low.
As shown in FIG. 2, the invention provides a method for removing impurities from raw coal, which comprises the following steps:
and step 14, sending the undersize products and the dehydrated lump coal into an inspection impurity removal device 4 for three-stage treatment to obtain second iron impurities and raw coal.
In the embodiment, the coarse coal to be subjected to impurity removal is subjected to primary treatment through a pre-impurity removal device 1 and a classifying screen 2 to obtain oversize products, the oversize products are sent to a lump coal impurity removal device 3 to be subjected to secondary treatment to obtain dehydrated light impurities and dehydrated lump coal, and then the dehydrated light impurities and the dehydrated lump coal enter an inspection impurity removal device 4 to be subjected to tertiary treatment to finally obtain treated raw coal; the intelligent and automatic impurity removal of the raw coal is realized, the impurity removal effect is easy to guarantee, the operation and maintenance process is simple, and the operation cost is low.
Specifically, step 12 includes:
and step 122, sending the raw coal subjected to iron removal into a classifying screen 2 for classification treatment to obtain oversize products and undersize products, wherein the oversize products are output to a lump coal impurity removal device 3 through an oversize product discharge port 23, and the undersize products are output to an inspection impurity removal device 4 through an undersize product discharge port 24.
As shown in fig. 1, in this embodiment, raw coal to be processed enters a pre-impurity removal device 1, and is sent into a first iron remover 12 through a raw coal belt conveyor 11 for iron removal, so as to obtain iron-removed raw coal and first iron impurities, where the first iron impurities can be recycled or discarded; the raw coal after iron removal is sent into a classifying screen 2 for classification treatment to obtain oversize products and undersize products, the oversize products are conveyed to a lump coal impurity removal device 3 through an oversize product discharge port 23, and the undersize products are conveyed to an inspection impurity removal device 4 through an undersize product discharge port 24.
131, providing pulse water flow to the shallow slot separator 31 through a slurry pump 35, and performing light impurity treatment on oversize products to obtain non-dehydrated light impurities and non-dehydrated lump coal;
step 132, dehydrating the non-dehydrated light impurities through an impurity dehydrating screen 32 to obtain dehydrated light impurities and first screened water; and (3) dehydrating the undehydrated lump coal through a lump coal dehydration sieve 33 to obtain dehydrated lump coal and second screen drainage.
As shown in fig. 1, in the embodiment, oversize products and undersize products obtained after being processed by the classifying screen 2 enter the shallow slot separator 31 in the lump coal impurity removing device 3, the slurry pump 35 provides a pulse water flow to the shallow slot separator 31, the light impurities overflow out of the shallow slot separator 31 through the pulse water flow, and the oversize products which do not overflow out are the lump coal which is not dehydrated; the non-dehydrated light impurities are dehydrated through an impurity dehydrating screen 32 to obtain first undersize water and dehydrated light impurities, wherein the light impurities can be discarded and/or recycled, and the first undersize water can be discharged out of the impurity dehydrating screen 32 to a circulating water tank 34 so as to be recycled; the lump coal not dehydrated is dehydrated by the lump coal dehydration screen 33 to obtain second undersize water which can be discharged out of the impurity dehydration screen 32 into the circulation water tank 34 so as to be used for circulation and dehydrated lump coal.
As shown in fig. 1, the process of providing the pulse water flow by the slurry pump 35 is described herein, the circulation water tank 34 is provided with a clean water inlet 341, a screen water inlet 342, a diversion outlet 343 and a circulation water outlet 344, the circulation water tank 34 includes the slurry water, the screen water inlet 342 receives the first screen water and the second screen water, the clean water inlet 341 feeds the clean water and/or the purified circulation water into the circulation water tank 34, when the concentration of the slurry water in the circulation water tank 34 needs to be adjusted, the slurry water in the circulation water tank 34 can be diverted to the slurry water treatment link through the diversion outlet 343 or the clean water and/or the purified circulation water can be fed into the circulation water tank 34 to ensure that the concentration of the slurry water is within a proper range; the slurry in the circulating water tank 34 flows into the slurry pump 35 through the circulating water outlet 344, and the slurry pump 35 provides pulse power to the slurry and delivers the pulse water flow to the shallow slot separator 31.
step 141, delivering undersize products of the grading sieve and the dehydrated lump coal to a raw coal belt conveyor 41;
and 142, conveying the undersize products of the grading sieve and the dehydrated lump coal into a second iron remover 42 for iron removal treatment through the raw coal belt conveyor 41 to obtain second iron impurities and raw coal.
As shown in fig. 1, in this embodiment, the undersize of the classifying screen and the dehydrated lump coal are merged and sent to the raw coal belt conveyor 41 of the inspection and impurity removal device 4, a second iron remover 42 is fixedly connected above the raw coal discharge port 412 of the raw coal belt conveyor 41, and iron removal is performed by the second iron remover 42 to obtain second iron impurities and raw coal after iron removal, wherein the second iron impurities can be recycled, and the raw coal after impurity removal is the raw coal after treatment by the inspection and impurity removal device 4.
The method comprises the steps of obtaining raw coal to be subjected to impurity removal; performing primary treatment on the raw coal to be subjected to impurity removal sequentially through a pre-impurity removal device 1 to obtain first iron impurities and pre-impurity-removed materials; feeding the pre-impurity-removed material into a grading sieve 2 for grading to obtain oversize products and undersize products; sending the oversize products of the grading sieve into a lump coal impurity removal device 3 for secondary treatment to obtain dehydrated light impurities and dehydrated lump coal; and (3) conveying the undersize products of the classifying screen and the dehydrated lump coal into an inspection impurity removal device 4 for three-stage treatment to obtain second iron impurities and raw coal. The intelligent and automatic impurity removal of the raw coal is realized, the impurity removal effect is easy to guarantee, the operation and maintenance process is simple, and the operation cost is low.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A system for removing impurities from raw coal, comprising:
a pre-impurity removal device (1);
the classifying screen (2), the classifying screen (2) is communicated with the pre-impurity removal device (1);
the lump coal impurity removal device (3), the lump coal impurity removal device (3) is communicated with the classifying screen (2);
and the inspection impurity removal device (4) is communicated with the grading sieve (2) and the lump coal impurity removal device (3).
2. A system for impurity removal of raw coal according to claim 1, characterized in that the pre-impurity removal device (1) comprises:
the raw coal belt conveyor (11) is provided with a raw coal feeding hole (111) and a raw coal discharging hole (112);
and a first iron remover (12) is fixed above the raw coal discharge port (112), and a first sundry discharge port (121) is arranged below the first iron remover (12).
3. A system for removing impurities from raw coal according to claim 1, wherein the classifying screen (2) comprises:
a classifying screen body (21);
a classifying screen feeding port (22) arranged on the classifying screen body (21);
an oversize material outlet (23) arranged on the classifying screen body (21);
and a screen underflow discharge port (24) provided on the classifying screen body (21).
4. A raw coal impurity removal system according to claim 3, wherein the lump coal impurity removal device (3) comprises:
the shallow groove separator (31), the shallow groove separator (31) is provided with a feeding port (311), a light product discharge port (312), a heavy product discharge port (313) and a water inlet (314);
the sundries dewatering screen (32) is fixedly connected with a light product discharge port (312) of the shallow slot separator (31), and a second sundries discharge port (321) and a first screened water outlet (322) are arranged on the sundries dewatering screen (32);
the lump coal dewatering screen (33) is fixedly connected with the heavy product discharge port (313) of the shallow slot separator (31), and a lump coal discharge port (331) and a second screen water outlet (332) are arranged on the lump coal dewatering screen (33);
a circulating water barrel (34) fixedly connected with a first undersize water outlet (322) of the sundries dewatering screen (32) and a second undersize water outlet (332) of the lump coal dewatering screen (33), wherein a clean water inlet (341), an undersize water inlet (342), a shunt outlet (343) and a circulating water outlet (344) are arranged on the circulating water barrel (34);
and the slurry pump (35) is fixedly connected with one end of the circulating water outlet (344) of the circulating water bucket (34) and the other end of the circulating water outlet of the circulating water bucket is fixedly connected with the water inlet (314) of the shallow groove separator (31).
5. A raw coal impurity removal system according to claim 4, wherein the screen slot sizes of the impurity dewatering screen (32) and the lump coal dewatering screen (33) are smaller than the classification grain size of the classification screen (2).
6. A system for impurity removal of raw coal according to claim 4, wherein the inspection impurity removal device (4) comprises:
the raw coal belt conveyor (41) is fixedly connected with the undersize material outlet (24) of the classifying screen (2) and the lump coal outlet (331) of the lump coal dewatering screen (33), and a raw coal inlet (411) and a raw coal outlet (412) are formed in the raw coal belt conveyor (41);
and a second iron remover (42) is fixedly connected above the raw coal discharge port (412), and a third sundry discharge port (421) is arranged below the second iron remover (42).
7. A method for removing impurities from raw coal, which is characterized by comprising the following steps:
obtaining raw coal to be purified;
performing primary treatment on the raw coal to be subjected to impurity removal sequentially through a pre-impurity removal device (1) and a classifying screen (2) to obtain first iron impurities, oversize products and undersize products;
sending the oversize products into a lump coal impurity removal device (3) for secondary treatment to obtain dehydrated light impurities and dehydrated lump coal;
and (3) conveying the undersize product and the dehydrated lump coal into an inspection impurity removal device (4) for three-stage treatment to obtain second iron impurities and raw coal.
8. The method for removing impurities from raw coal according to claim 7, wherein the raw coal to be subjected to impurity removal is subjected to primary treatment sequentially through a pre-impurity removal device (1) and a classifying screen (2) to obtain first iron impurities, oversize products and undersize products, and the method comprises the following steps:
the raw coal to be subjected to impurity removal is sent into a first iron remover (12) through a raw coal belt conveyor (11) for iron removal treatment to obtain the raw coal subjected to iron removal and first iron impurities, and the first iron impurities are discharged through a first impurity discharge hole (121);
and (3) sending the raw coal after iron removal into a classifying screen (2) for classification treatment to obtain oversize products and undersize products, wherein the oversize products are output to a lump coal impurity removal device (3) through an oversize product discharge port (23), and the undersize products are output to an inspection impurity removal device (4) through an undersize product discharge port (24).
9. The method for removing impurities from raw coal according to claim 7, wherein the oversize product is sent to a lump coal impurity removal device (3) for secondary treatment to obtain dehydrated light impurities and dehydrated lump coal, and the method comprises the following steps:
pulse water flow is provided for the shallow groove separator (31) through a slurry pump (35), and light sundries treatment is carried out on oversize products to obtain non-dehydrated light sundries and non-dehydrated lump coal;
dehydrating the non-dehydrated light impurities through an impurity dehydrating screen (32) to obtain dehydrated light impurities and first screened water; and (3) dehydrating the undehydrated lump coal through a lump coal dehydration sieve (33) to obtain dehydrated lump coal and second sieve water.
10. The method for removing impurities from raw coal according to claim 7, wherein the undersize product and the dehydrated lump coal are sent to an inspection and impurity removal device (4) for three-stage treatment to obtain a second iron impurity and raw coal, and the method comprises the following steps:
feeding the undersize and the dehydrated lump coal into a raw coal belt conveyor (41);
and (3) sending the undersize products and the dehydrated lump coal into a second iron remover (42) for iron removal treatment through the raw coal belt conveyor (41) to obtain second iron impurities and raw coal.
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