CN113941431A - Method and system for 3mm deep separation of power coal - Google Patents
Method and system for 3mm deep separation of power coal Download PDFInfo
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- CN113941431A CN113941431A CN202111170669.1A CN202111170669A CN113941431A CN 113941431 A CN113941431 A CN 113941431A CN 202111170669 A CN202111170669 A CN 202111170669A CN 113941431 A CN113941431 A CN 113941431A
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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
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
- B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
- B03B5/36—Devices therefor, other than using centrifugal force
- B03B5/40—Devices therefor, other than using centrifugal force of trough type
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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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Abstract
A method and system for powered coal 3mm deep sorting, the method comprising: (1) carrying out primary classification of 50mm and 3mm on the raw coal of the power coal to obtain a classified material with the particle size of more than 50mm and the particle size of 3-50mm and a slack coal product with the particle size of less than 3 mm; (2) sorting classified materials with the particle size of 3-50mm by using 3mm shallow grooves to obtain first heavy medium clean coal and first heavy medium gangue; (3) sequentially carrying out medium removal and dehydration and 25mm classification on the first heavy medium clean coal to obtain a qualified medium and a dilute medium with the grain size of less than 2mm, clean coal with the grain size of 2-25mm and a lump clean coal product with the grain size of more than 25 mm; (4) and (4) carrying out dry separation on the classified materials with the particle size larger than 50mm to obtain a block clean coal product. The system comprises a classifying screen, a narrow-size shallow-groove separator, a clean coal medium-removing screen and an intelligent dry separator. The method and the system can realize the 3mm deep separation of the power coal.
Description
Technical Field
The invention belongs to the field of coal separation, and particularly relates to a method and a system for 3mm deep separation of power coal.
Background
The lower limit of the traditional power coal separation is mainly 25/13mm, and the slack coal is not separated. When the calorific capacity can not meet the requirement, wet screening is often required, namely, raw coal full-water separation is carried out, the wet screening often causes the increase of product moisture and reduces the calorific capacity of products, so that the requirement of further washing, ash reduction and quality improvement is approached, the washing lower limit of the wet screening is often required to reach 1/0.5mm, the power coal is excessively separated, the coal slime water has large load, the environmental protection pressure is large, and the washing and selecting processing cost is high.
Disclosure of Invention
The first purpose of the invention is to provide a method for 3mm deep separation of power coal, which can realize 3mm deep separation of the power coal and quality and ash reduction of the power coal;
the second purpose of the invention is to provide a system for performing the 3mm depth separation of the power coal by using the method, the system has a simple structure, and can realize the 3mm depth separation of the power coal and the quality improvement and ash reduction of the power coal.
In order to realize the purpose of the invention, the following technical scheme is adopted:
a method for powered coal 3mm deep separation, the method comprising:
(1) sequentially carrying out primary grading on raw coal of the power coal by phi 50mm and phi 3mm to obtain a primary material with the particle size larger than 50mm as a grading material with the particle size larger than 50mm, a primary material with the particle size of 3-50mm as a grading material with the particle size of 3-50mm and a slack coal product with the particle size smaller than 3 mm;
(2) carrying out shallow slot separation with the diameter of 3mm to 3mm on the classified material with the particle size of 3mm to 50mm obtained in the step (1) to obtain first heavy medium clean coal and first heavy medium gangue;
(3) sequentially carrying out medium removal and dehydration and phi 25mm classification on the first heavy medium clean coal obtained in the step (2) to obtain qualified medium and dilute medium with the particle size of less than 2mm, clean coal with the particle size of 2-25mm and block clean coal products with the particle size of more than 25 mm;
(4) and (3) carrying out dry separation on the classified materials with the particle size larger than 50mm obtained in the step (1) to obtain large gangue and lump clean coal products.
According to the method for 3mm deep separation of the power coal, disclosed by the invention, the raw coal of the power coal is firstly subjected to primary classification of phi 50mm and phi 3mm in sequence, the part of the final coal product with the particle size of less than 3mm and the part of the classified material with the particle size of more than 50mm are separated, the part of the material is prevented from being washed and selected, only the part of the classified material with the particle size of 3-50mm is washed and selected, the 3mm deep separation of the power coal can be realized, and therefore, the quality improvement and the ash reduction of the power coal are realized; specifically, compared with the situation of full raw coal launching, the method avoids full raw coal launching of the power coal, so that the moisture of the sorted product is prevented from being increased; compared with the traditional situation that the lower limit of power coal separation is 25/13mm and slack coal is not separated, the method improves the washing proportion in a proper range, so that materials with the particle size of 3-13mm can be washed by water, and the amount of the obtained washing products is increased; compared with wet screening, the method can also avoid the over-high washing proportion, avoid the washing and the separation of materials with the particle size of 1/0.5-3mm under water, avoid the excessive separation of power coal and further reduce the water load of the coal slime.
Those skilled in the art understand that wet screening refers to whether a portion of raw coal with a particle size of <3mm is launched, if launched, then wet screening, and otherwise not.
Preferably, the primary material with the particle size of 3-50mm obtained in the step (1) is subjected to secondary classification with the particle size of 3mm before the step (2), the classification efficiency can reach at least 85 wt%, and the secondary material with the particle size of 3-50mm is obtained and is used as the classified material with the particle size of 3-50mm for the step (2) and the slack coal product with the particle size of 3mm, so that the slack coal product with the particle size of 3mm in the primary material with the particle size of 3-50mm is further separated, the water washing and the separation are avoided, the excessive separation of power coal is further avoided, and the load of coal slurry is reduced.
Preferably, the first heavy medium clean coal obtained in the step (2) is subjected to pre-medium removal treatment before the step (3) to remove qualified media, so that the dehydration and medium removal efficiency and the dehydration and medium removal effect are improved, the water content increase of the product is further limited, and the quality improvement and ash reduction of the power coal are realized.
Preferably, the system further comprises the following steps in sequence:
(5) performing medium removal and dehydration treatment on the first heavy medium gangue obtained in the step (2) to obtain qualified medium, dilute medium and heavy medium gangue serving as discharge;
(6) carrying out magnetic separation treatment on the dilute medium removed in the step (3) and the step (5) to recover the medium, so as to obtain magnetic concentrate and magnetic tailings;
(7) inputting the qualified medium removed in the step (3) and the step (5) and the magnetic separation concentrate obtained in the step (6) into a qualified medium barrel, supplementing magnetite powder into the qualified medium barrel to obtain qualified medium for replenishment, and returning the qualified medium for replenishment to the shallow groove sorting device in the step (2);
(8) dehydrating the magnetic separation tailings obtained in the step (6) to obtain a clean coal slime product and coal slime water;
(9) sequentially concentrating and filter-pressing the slime water obtained in the step (8) to obtain slime and removed liquid;
(10) and (4) adding clear water into the liquid obtained in the step (9), and then respectively returning the liquid to the grading device in the step (3), the medium removal and dehydration device in the step (5) and the qualified medium barrel in the step (7).
As understood by those skilled in the art, magnetite powder is the separation medium in the coal separation process; the density of the sorting medium in the solution is the same as the sorting density, and the solution is qualified medium; when the density of the sorting medium in the solution is less than the sorting density, the solution is a dilute medium.
Through the steps, the method is beneficial to improving the washing efficiency of the power coal product and improving the yield and the product quality of the power coal product.
Preferably, the step (3) further comprises dewatering the obtained clean coal with the particle size of 2-25mm to obtain a clean coal product with the particle size of 2-25mm, so that the water content of the clean coal product with the particle size of 2-25mm is reduced, and the quality of the clean coal product is improved.
Preferably, the dewatering treatment in the step (8) includes any one or more of concentrating cyclone dewatering, sieve bend dewatering and centrifuge dewatering, so as to carry out deep dewatering on the magnetic separation tailings, reduce the moisture of the obtained fine coal slime product and improve the quality of the fine coal slime product.
Preferably, the dehydration treatment in the step (8) sequentially comprises concentration cyclone dehydration, sieve bend dehydration and centrifuge dehydration, so that the magnetic separation tailings are better subjected to deep dehydration, the moisture of the obtained clean coal slime product is reduced, and the quality of the clean coal slime product is improved.
Preferably, the shallow slot sorting device in the step (2) is a narrow-size shallow slot sorting machine, and the aperture of the opening of the underflow plate of the narrow-size shallow slot sorting machine is phi 6 mm. The aperture of the opening of the underflow plate is phi 6mm, which means that the diameter of the opening of the underflow plate is 6 mm.
To achieve the second object of the present invention, the present invention also provides a system for 3mm deep separation of kinetic coal using the aforementioned method.
Preferably, the system comprises:
the grading screen comprises a primary grading screen which is a double-layer screen and is used for sequentially grading raw coal with the particle diameter of 50mm and the particle diameter of 3mm to obtain a primary material with the particle diameter of more than 50mm as a grading material with the particle diameter of more than 50mm, a primary material with the particle diameter of 3-50mm as a grading material with the particle diameter of 3-50mm and a slack coal product with the particle diameter of less than 3 mm;
the narrow-size-fraction shallow groove separator is connected with the classifying screen through a chute and is used for receiving classified materials with the particle size of 3-50mm from the classifying screen and performing shallow groove separation with the particle size of phi 3mm on the classified materials to obtain first heavy medium clean coal and first heavy medium gangue;
the fixed sieve is connected with the narrow-size-fraction shallow groove separator through a chute and is used for receiving the first heavy medium clean coal from the narrow-size-fraction shallow groove separator and performing pre-medium removal treatment on the first heavy medium clean coal to obtain second heavy medium clean coal serving as an oversize material and a first qualified medium serving as an undersize material;
the clean coal sculping screen is connected with the fixed screen through a chute and is used for receiving second heavy medium clean coal from the fixed screen and sequentially carrying out phi 2mm secondary sculping dehydration and phi 25mm classification on the second heavy medium clean coal to obtain a second qualified medium and a first dilute medium with the particle size of less than 2mm, third heavy medium clean coal with the particle size of 2-25mm and a lump clean coal product with the particle size of more than 25 mm;
the first centrifugal dehydrator is connected with the clean coal scumming sieve through a chute and is used for receiving third dense clean coal with the particle size of 2-25mm from the clean coal scumming sieve and centrifugally dehydrating the third dense clean coal to obtain a first centrifugate and a clean coal product with the particle size of 2-25 mm;
the gangue medium removing sieve is connected with the narrow-grade shallow groove separator through a chute and is used for receiving first heavy medium gangue from the narrow-grade shallow groove separator and performing medium removing and dewatering treatment on the first heavy medium gangue to obtain a third qualified medium, a second dilute medium and heavy medium gangue serving as discharge;
the magnetic separator is communicated with the fixed sieve, the clean coal medium removing sieve, the first centrifugal dehydrator and the gangue medium removing sieve through pipelines respectively, and a shunting structure is arranged on the pipeline from the fixed sieve to the magnetic separator; the flow dividing structure is used for dividing the first qualified medium from the fixed sieve to obtain a fourth qualified medium and a fifth qualified medium; the magnetic separator is used for receiving a first dilute medium from the clean coal medium removing sieve, a first centrifugal liquid from the first centrifugal dehydrator, a second dilute medium from the gangue medium removing sieve and a fifth qualified medium from the shunting structure, and performing medium recovery on the first dilute medium, the first centrifugal liquid, the second dilute medium and the fifth qualified medium to obtain magnetic concentrate and magnetic tailings;
the qualified medium barrel is respectively connected with the clean coal medium removing sieve, the gangue medium removing sieve, the magnetic separator, the flow dividing structure and the narrow-grade shallow slot separator through pipelines, and is used for receiving a second qualified medium from the clean coal medium removing sieve, a third qualified medium from the gangue medium removing sieve, a magnetic concentrate from the magnetic separator and a fourth qualified medium from the flow dividing structure, replenishing magnetite powder to obtain a qualified medium for replenishment, and feeding the qualified medium back to the narrow-grade shallow slot separator;
the sieve bend is connected with the magnetic separator through a pipeline and used for receiving the magnetic separation tailings from the magnetic separator and pre-dehydrating the magnetic separation tailings to obtain oversize materials and undersize slime water;
the second centrifuge is connected with the arc-shaped screen through a chute and is used for receiving oversize materials from the arc-shaped screen and centrifugally dewatering the oversize materials to obtain a dewatered clean coal slime product and a second centrifugal liquid;
the deep cone thickener is respectively connected with the arc screen and the second centrifugal machine through pipelines and is used for receiving undersize coal slime from the arc screen and second centrifugal liquid from the second centrifugal machine and concentrating the undersize coal slime to obtain second concentrated underflow and second concentrated overflow;
the filter press is connected with the deep cone thickener through a chute and is used for receiving and filter-pressing a second concentrated underflow from the deep cone thickener to obtain a coal slime product and filtrate;
the clean water tank is used for providing clean water as supplementary water;
the circulating water tank is respectively connected with the clean coal medium removing sieve, the gangue medium removing sieve, the qualified medium barrel, the deep cone thickener, the filter press and the clean water tank through pipelines, and is used for receiving a second concentrated overflow from the deep cone thickener, a filtrate from the filter press and clean water from the clean water tank and supplying the second concentrated overflow, the filtrate and the clean water back to the clean coal medium removing sieve, the gangue medium removing sieve and the qualified medium barrel;
and the intelligent dry-method separator is connected with the primary classifying screen through a chute and is used for receiving the primary material with the particle size larger than 50mm from the primary classifying screen and performing dry-method separation on the primary material to obtain a large gangue and block clean coal product.
According to the system for 3mm deep separation of the power coal, disclosed by the invention, the raw coal of the power coal can be sequentially subjected to primary classification of phi 50mm and phi 3mm, the part of the final coal product with the particle size of less than 3mm and the part of the classified material with the particle size of more than 50mm are separated, the part of the material is prevented from being washed and selected, only the part of the classified material with the particle size of 3-50mm is washed and selected, the 3mm deep separation of the power coal can be realized, and therefore, the quality improvement and the ash reduction of the power coal are realized; firstly, compared with the situation of full raw coal launching, the method avoids the full raw coal launching of the power coal, thereby avoiding the moisture increase of the sorted product; secondly, compared with the traditional situation that the lower limit of power coal separation is 25/13mm and slack coal is not separated, the method improves the washing proportion in a proper range, so that materials with the particle size of 3-13mm can be washed by water, and the amount of the obtained washing products is increased; moreover, compared with wet screening, the method and the device can also avoid the over-high washing proportion, avoid the washing and the separation of materials with the particle size of 1/0.5-3mm, avoid the excessive separation of power coal and further reduce the water load of the coal slime.
Preferably, the classifying screen further comprises a secondary classifying screen, the secondary classifying screen is a single-layer screen, the secondary classifying screen is connected with the primary classifying screen through a chute and is used for receiving the primary material with the particle size of 3-50mm from the primary classifying screen and performing secondary classification with the particle size of 3mm, the classifying efficiency can reach at least 85 wt%, and the secondary material with the particle size of 3-50mm is obtained and used as the classified material with the particle size of 3-50mm and the final coal product with the particle size of less than 3mm, so that the water content of the classified material with the particle size of 3-50mm is further reduced, and the quality of the classified material is improved.
Preferably, the system further comprises a concentration cyclone, which is disposed on a pipeline from the magnetic separator to the sieve bend and connected with the deep cone thickener through a pipeline, and is configured to receive the magnetic tailings from the magnetic separator and concentrate the magnetic tailings to obtain a first concentration underflow as the feed of the sieve bend and a first concentration overflow as the feed of the deep cone thickener.
Preferably, the diameter of the opening hole of the underflow plate of the narrow-size fraction shallow slot separator is phi 6 mm.
The invention has the beneficial effects that:
according to the method and the system for 3mm deep separation of the power coal, the slack coal product part with the particle size less than 3mm and the classified material part with the particle size more than 50mm can be separated, the part of the material is prevented from being washed and selected, only the classified material part with the particle size of 3-50mm is washed and selected, 3mm deep separation of the power coal can be realized, and therefore quality improvement and ash reduction of the power coal are realized; specifically, compared with the situation of full raw coal launching, the method avoids full raw coal launching of the power coal, so that the moisture of the sorted product is prevented from being increased; compared with the traditional situation that the lower limit of power coal separation is 25/13mm and slack coal is not separated, the method improves the washing proportion in a proper range, so that materials with the particle size of 3-13mm can be washed by water, and the amount of the obtained washing products is increased; compared with wet screening, the method can also avoid the over-high washing proportion, avoid washing and selecting the materials with the particle size of 1/0.5-3mm under water, avoid excessive separation of power coal and further reduce coal slurry water load.
Drawings
FIG. 1 is a schematic structural diagram of a system for powered coal 3mm deep sorting according to the present invention in one embodiment.
Detailed Description
The technical solution and the effects of the present invention will be further explained with reference to the accompanying drawings and the detailed description. The following embodiments are merely illustrative of the present invention, and the present invention is not limited to the following embodiments or examples. Simple modifications of the invention applying the inventive concept are within the scope of the invention as claimed.
The invention provides a method for 3mm deep separation of power coal, which comprises the following steps:
(1) sequentially carrying out primary grading on raw coal of the power coal by phi 50mm and phi 3mm to obtain a primary material with the particle size larger than 50mm as a grading material with the particle size larger than 50mm, a primary material with the particle size of 3-50mm as a grading material with the particle size of 3-50mm and a slack coal product with the particle size smaller than 3 mm;
(2) carrying out shallow slot separation with the diameter of 3mm to 3mm on the classified material with the particle size of 3mm to 50mm obtained in the step (1) to obtain first heavy medium clean coal and first heavy medium gangue;
(3) sequentially carrying out medium removal and dehydration and phi 25mm classification on the first heavy medium clean coal obtained in the step (2) to obtain qualified medium and dilute medium with the particle size of less than 2mm, clean coal with the particle size of 2-25mm and block clean coal products with the particle size of more than 25 mm;
(4) and (3) carrying out dry separation on the classified materials with the particle size larger than 50mm obtained in the step (1) to obtain large gangue and lump clean coal products.
Those skilled in the art will appreciate that the primary classification may employ a classification apparatus commonly used in the art, such as a classifying screen, preferably a double layer relaxation screen; the shallow groove sorting can adopt a shallow groove sorting device commonly used in the field, such as a narrow-grain-grade shallow groove sorting machine; the de-medialization and dehydration and the phi 25mm classification in the step (3) can adopt classification equipment commonly used in the field, such as a clean coal de-medialization sieve; the dry sorting in step (4) may adopt a dry sorting device commonly used in the art, such as an intelligent dry sorter.
According to the method for 3mm deep separation of the power coal, disclosed by the invention, the raw coal of the power coal is firstly subjected to primary classification of phi 50mm and phi 3mm in sequence, the part of the final coal product with the particle size of less than 3mm and the part of the classified material with the particle size of more than 50mm are separated, the part of the material is prevented from being washed and selected, only the part of the classified material with the particle size of 3-50mm is washed and selected, the 3mm deep separation of the power coal can be realized, and therefore, the quality improvement and the ash reduction of the power coal are realized; specifically, compared with the situation of full raw coal launching, the method avoids full raw coal launching of the power coal, so that the moisture of the sorted product is prevented from being increased; compared with the traditional situation that the lower limit of power coal separation is 25/13mm and slack coal is not separated, the method improves the washing proportion in a proper range, so that materials with the particle size of 3-13mm can be washed by water, and the amount of the obtained washing products is increased; compared with wet screening, the method can also avoid the over-high washing proportion, avoid the washing and the separation of materials with the particle size of 1/0.5-3mm under water, avoid the excessive separation of power coal and further reduce the water load of the coal slime.
Those skilled in the art understand that wet screening refers to whether a portion of raw coal with a particle size of <3mm is launched, if launched, then wet screening, and otherwise not.
In one embodiment, the primary material with the particle size of 3-50mm obtained in the step (1) is subjected to secondary classification with the particle size of 3mm before the step (2), the classification efficiency can reach at least 85 wt%, and the secondary material with the particle size of 3-50mm is obtained and is used as the classified material with the particle size of 3-50mm for the step (2) and the slack coal product with the particle size of less than 3mm, so that the slack coal product with the particle size of less than 3mm in the primary material with the particle size of 3-50mm is further separated, the water washing separation of the slack coal product is avoided, the power coal over-separation is further avoided, and the water load of coal slime is reduced.
It is understood by those skilled in the art that the secondary classification employs a classifying screen, preferably a single layer relaxation screen.
In one embodiment, the first heavy medium clean coal obtained in the step (2) is subjected to pre-medium removal treatment to remove qualified media before the step (3), so that the dehydration and medium removal efficiency and the dehydration and medium removal effect are improved, the water content of the product is further reduced, and the quality and ash reduction of the power coal are realized.
Those skilled in the art will appreciate that pre-de-mediating treatment may employ a fixed sieve.
In one embodiment, the system further comprises the following steps in sequence:
(5) performing medium removal and dehydration treatment on the first heavy medium gangue obtained in the step (2) to obtain qualified medium, dilute medium and heavy medium gangue serving as discharge;
(6) carrying out magnetic separation treatment on the dilute medium removed in the step (3) and the step (5) to recover the medium, so as to obtain magnetic concentrate and magnetic tailings;
(7) inputting the qualified medium removed in the step (3) and the step (5) and the magnetic separation concentrate obtained in the step (6) into a qualified medium barrel, supplementing magnetite powder into the qualified medium barrel to obtain qualified medium for replenishment, and returning the qualified medium for replenishment to the shallow groove sorting device in the step (2);
(8) dehydrating the magnetic separation tailings obtained in the step (6) to obtain a clean coal slime product and coal slime water;
(9) sequentially concentrating and filter-pressing the slime water obtained in the step (8) to obtain slime and removed liquid;
(10) and (4) adding clear water into the liquid obtained in the step (9), and then respectively returning the liquid to the grading device in the step (3), the medium removal and dehydration device in the step (5) and the qualified medium barrel in the step (7).
As understood by those skilled in the art, magnetite powder is the separation medium in the coal separation process; the density of the sorting medium in the solution is the same as the sorting density, and the solution is qualified medium; when the density of the sorting medium in the solution is less than the sorting density, the solution is a dilute medium.
Those skilled in the art will understand that the medium removing and dewatering treatment of step (5) can be performed by using medium removing and dewatering devices commonly used in the art, such as gangue medium removing screens; the magnetic separation treatment of the step (6) can adopt a magnetic separation device commonly used in the field, such as a magnetic separator; the dehydration treatment in the step (8) can adopt a dehydration device commonly used in the field, such as a concentration cyclone, a curved screen, a centrifugal machine and the like; the concentration treatment of step (9) may be carried out by a concentration apparatus commonly used in the art, such as a deep cone thickener, a filter press, etc.
Through the steps, the method is beneficial to improving the washing efficiency of the power coal product and improving the yield and the product quality of the power coal product.
In one embodiment, the step (3) further comprises dewatering the obtained clean coal with the particle size of 2-25mm to obtain a clean coal product with the particle size of 2-25mm, so as to reduce the water content of the clean coal product with the particle size of 2-25mm and improve the quality of the clean coal product.
In one embodiment, the dewatering treatment in the step (8) includes any one or more of concentrating cyclone dewatering, arc screen dewatering and centrifuge dewatering, so as to deeply dewater the magnetic separation tailings, reduce the water content of the obtained clean coal slime product and improve the quality of the clean coal slime product.
In an embodiment, the dewatering treatment in the step (8) sequentially comprises concentrating cyclone dewatering, sieve bend dewatering and centrifuge dewatering, so that the magnetic separation tailings are better subjected to deep dewatering, the moisture of the obtained fine coal slime product is reduced, and the quality of the fine coal slime product is improved.
In one embodiment, the shallow trench sorting device in the step (2) is a narrow-size shallow trench sorting machine, and the opening diameter of an underflow plate of the narrow-size shallow trench sorting machine is 6mm, so that sorted materials with the diameter of 3mm can pass through the narrow-size shallow trench sorting machine.
The invention also provides a system for carrying out 3mm deep separation on the power coal by using the method.
In one embodiment, the system comprises:
the grading screen comprises a primary grading screen 1, the primary grading screen 1 is a double-layer screen and is used for sequentially carrying out primary grading of phi 50mm and phi 3mm on raw coal of power coal to obtain a primary material with the particle size of more than 50mm as a grading material with the particle size of more than 50mm, a primary material with the particle size of 3-50mm as a grading material with the particle size of 3-50mm and a slack coal product with the particle size of less than 3 mm;
the narrow-size-fraction shallow groove separator 3 is connected with the classifying screen through a chute and is used for receiving classified materials with the particle size of 3-50mm from the classifying screen and carrying out shallow groove separation with the particle size of phi 3mm on the classified materials to obtain first heavy medium clean coal and first heavy medium gangue;
the clean coal medium removing sieve 5 is communicated with the narrow-size shallow groove separator 3 and is used for receiving the first heavy medium clean coal from the narrow-size shallow groove separator 3, sequentially carrying out phi 2mm secondary medium removing and dewatering and phi 25mm classification on the first heavy medium clean coal, and obtaining a second qualified medium and a first dilute medium with the particle size of less than 2mm, a third heavy medium clean coal with the particle size of 2-25mm and a lump clean coal product with the particle size of more than 25 mm;
and the intelligent dry separator 18 is communicated with the primary grading sieve 1 and is used for receiving the primary material with the particle size larger than 50mm from the primary grading sieve 1 and performing dry separation on the primary material to obtain a large gangue and block clean coal product.
In one embodiment, as shown in FIG. 1, the system comprises:
the grading screen comprises a primary grading screen 1, the primary grading screen 1 is a double-layer screen and is used for sequentially carrying out primary grading of phi 50mm and phi 3mm on raw coal of power coal to obtain a primary material with the particle size of more than 50mm as a grading material with the particle size of more than 50mm, a primary material with the particle size of 3-50mm as a grading material with the particle size of 3-50mm and a slack coal product with the particle size of less than 3 mm;
the narrow-size-fraction shallow groove separator 3 is connected with the classifying screen through a chute and is used for receiving classified materials with the particle size of 3-50mm from the classifying screen and carrying out shallow groove separation with the particle size of phi 3mm on the classified materials to obtain first heavy medium clean coal and first heavy medium gangue;
the fixed sieve 4 is connected with the narrow-size-fraction shallow groove separator 3 through a chute and is used for receiving the first heavy medium clean coal from the narrow-size-fraction shallow groove separator 3 and carrying out pre-medium removal treatment on the first heavy medium clean coal to obtain second heavy medium clean coal serving as material on the sieve and first qualified medium serving as material under the sieve; preferably, the aperture of the sieve pore of the fixed sieve 4 is 2 mm;
the clean coal medium removing sieve 5 is connected with the fixed sieve 4 through a chute and is used for receiving second heavy medium clean coal from the fixed sieve 4 and sequentially carrying out phi 2mm secondary medium removing and dewatering and phi 25mm grading on the second heavy medium clean coal to obtain a second qualified medium and a first dilute medium with the grain size of less than 2mm, third heavy medium clean coal with the grain size of 2-25mm and a lump clean coal product with the grain size of more than 25 mm;
the first centrifugal dehydrator 6 is connected with the clean coal medium removing sieve 5 through a chute, and is used for receiving third clean coal with the particle size of 2-25mm from the clean coal medium removing sieve 5 and performing centrifugal dehydration on the third clean coal to obtain a first centrifugate and a clean coal product with the particle size of 2-25 mm; preferably, the size of the screen slot/screen hole of the first centrifugal dehydrator 6 is 0.35 mm;
the gangue medium removing sieve 7 is connected with the narrow-size-grade shallow groove separator 3 through a chute, and is used for receiving the first heavy medium gangue from the narrow-size-grade shallow groove separator 3 and performing medium removing and dewatering treatment on the first heavy medium gangue to obtain a third qualified medium, a second dilute medium and heavy medium gangue serving as discharged materials; preferably, the pore diameter of the gangue medium removing sieve 7 is 0.5 mm;
the magnetic separator 8 is communicated with the fixed sieve 4, the clean coal medium removing sieve 5, the first centrifugal dehydrator 6 and the gangue medium removing sieve 7 through pipelines respectively, and a shunting structure 9 is arranged on the pipeline from the fixed sieve 4 to the magnetic separator 8; the flow dividing structure 9 is used for dividing the first qualified medium from the fixed screen 4 to obtain a fourth qualified medium and a fifth qualified medium; the magnetic separator 8 is used for receiving a first dilute medium from the clean coal medium removing sieve 5, a first centrifugal liquid from the first centrifugal dehydrator 6, a second dilute medium from the gangue medium removing sieve 7 and a fifth qualified medium from the shunting structure 9, and performing medium recovery on the first dilute medium, the first centrifugal liquid, the second dilute medium and the fifth qualified medium to obtain magnetic concentrate and magnetic tailings;
the qualified medium barrel 10 is respectively connected with the clean coal scumming screen 5, the gangue scumming screen 7, the magnetic separator 8, the flow dividing structure 9 and the narrow-size shallow groove separator 3 through pipelines, and is used for receiving a second qualified medium from the clean coal scumming screen 5, a third qualified medium from the gangue scumming screen 7, magnetic concentrate from the magnetic separator 8 and a fourth qualified medium from the flow dividing structure 9, replenishing magnetite powder to obtain a qualified replenishing medium, and feeding the qualified replenishing medium back to the narrow-size shallow groove separator 3;
the sieve bend 12 is connected with the magnetic separator 8 through a pipeline and used for receiving the magnetic separation tailings from the magnetic separator 8 and pre-dewatering the magnetic separation tailings to obtain oversize materials and undersize slime water; preferably, the aperture of the sieve pore of the arc sieve 12 is 0.35 mm;
the second centrifuge 13 is connected with the arc-shaped screen 12 through a chute and is used for receiving oversize materials from the arc-shaped screen 12 and carrying out centrifugal dehydration on the oversize materials to obtain a dehydrated fine coal slime product and a second centrifugate; preferably the screen slots/holes of the second centrifuge 13 have a size of 0.35 mm;
the deep cone thickener 14 is connected with the curved screen 12 and the second centrifuge 13 through pipelines respectively, and is used for receiving undersize coal slime from the curved screen 12 and second centrifugate from the second centrifuge 13 and concentrating the undersize coal slime to obtain a second concentrated underflow and a second concentrated overflow;
the filter press 15 is connected with the deep cone thickener 14 through a chute, and is used for receiving and filter-pressing the second concentrated underflow from the deep cone thickener 14 to obtain a coal slime product and a filtrate;
a clean water tank 16 for supplying clean water as supplementary water;
a circulating water tank 17, wherein the circulating water tank 17 is respectively connected with the clean coal scumming screen 5, the gangue scumming screen 7, the qualified medium barrel 10, the deep cone thickener 14, the filter press 15 and the clean water tank 16 through pipelines, and is used for receiving the second concentrated overflow from the deep cone thickener 14, the filtrate from the filter press 15 and the clean water from the clean water tank 16 and supplying the second concentrated overflow, the filtrate from the deep cone thickener 15 and the clean water back to the clean coal scumming screen 5, the gangue scumming screen 7 and the qualified medium barrel 10;
and the intelligent dry-method separator 18 is connected with the primary grading sieve 1 through a chute, and is used for receiving the primary material with the particle size larger than 50mm from the primary grading sieve 1 and performing dry separation on the primary material to obtain a large gangue and a lump clean coal product.
The system for 3mm deep separation of the power coal can separate a final coal product part with the particle size of less than 3mm and a grading material part with the particle size of more than 50mm, avoid water washing separation of the materials, only wash the grading material part with the particle size of 3-50mm, and realize 3mm deep separation of the power coal, thereby realizing quality improvement and ash reduction of the power coal; specifically, compared with the situation of full raw coal launching, the method avoids full raw coal launching of the power coal, so that the moisture of the sorted product is prevented from being increased; compared with the traditional power coal separation condition that the lower limit is 25/13mm and the slack coal is not separated, the method improves the washing proportion in a proper range, so that the material with the grain diameter of 3-13mm can be washed by water, and the amount of the obtained washing product is increased; compared with wet screening, the method and the device can also avoid the over-high washing proportion, avoid the washing and the separation of materials with the particle size of 1/0.5-3mm under water, avoid the excessive separation of power coal and further reduce the load of slime water.
In one embodiment, the classifying screen further comprises a secondary classifying screen 2, the secondary classifying screen 2 is a single-layer screen, the secondary classifying screen 2 is connected with the primary classifying screen 1 through a chute and is used for receiving the primary material with the grain diameter of 3-50mm from the primary classifying screen 1 and classifying the primary material with the grain diameter of 3mm for the second time, the classifying efficiency can reach at least 85 wt%, and the secondary material with the grain diameter of 3-50mm is obtained to be used as the classified material with the grain diameter of 3-50mm and the final coal product with the grain diameter of less than 3mm, so that the water content of the classified material with the grain diameter of 3-50mm is further reduced, and the quality of the classified material is improved.
In one embodiment, the primary sizing screen 1 is a double layer flip flow screen; the secondary classifying screen 2 is a single-layer relaxation screen.
In one embodiment, the system further comprises a concentrating cyclone 11, said concentrating cyclone 11 being arranged on a pipeline from the magnetic separator 8 to the curved screen 12 and being connected to the deep cone concentrator 14 by a pipeline for receiving and concentrating the magnetic tailings from the magnetic separator 8, resulting in a first concentrated underflow as feed to the curved screen 12 and a first concentrated overflow as feed to the deep cone concentrator 14. For example, the concentrating cyclone 11 has a classifying particle size of 0.35 mm.
In one embodiment, the diameter of the opening hole of the underflow plate of the narrow-size fraction shallow slot separator 3 is phi 6 mm.
It will be understood by those skilled in the art that water may be piped into the clean water basin 16 from the feed inlet of the clean water basin 16 and magnetite powder may be added to the qualified media cask 10 from the feed inlet of the qualified media cask 10.
In one embodiment, as shown in FIG. 1, the system for powered coal 3mm deep sorting of the present invention operates as follows:
(1) inputting raw coal of power coal into the primary grading sieve 1 to carry out primary grading with the diameter of 50mm and the diameter of 3mm in sequence to obtain a primary material with the particle size of more than 50mm, a primary material with the particle size of 3-50mm and a slack coal product with the particle size of less than 3 mm;
(2) inputting the primary material with the grain size of 3-50mm obtained in the step (1) into the secondary grading sieve 2 for secondary grading with the grain diameter of 3mm to obtain a secondary material with the grain size of 3-50mm and a slack coal product with the grain size of less than 3 mm;
(3) inputting the secondary material with the grain size of 3-50mm obtained in the step (2) into the narrow-grain-fraction shallow-groove separator 3 for phi 3mm shallow-groove separation to obtain first heavy medium clean coal and first heavy medium gangue;
(4) inputting the first heavy medium clean coal obtained in the step (3) into the fixed sieve 4 for pre-medium removal treatment to obtain second heavy medium clean coal serving as an oversize material and a first qualified medium serving as an undersize material;
(5) inputting the second dense medium clean coal obtained in the step (4) into the clean coal medium removing sieve 5 for carrying out phi 2mm secondary medium removing and dewatering and phi 25mm grading to obtain a second qualified medium and a first dilute medium with the particle size of less than 2mm, a third dense medium clean coal with the particle size of 2-25mm and a block clean coal product with the particle size of more than 25 mm;
(6) inputting the third dense medium clean coal obtained in the step (5) into the first centrifugal dehydrator 6 for centrifugal dehydration to obtain a first centrifugate and a clean coal product with the particle size of 2-25 mm;
(7) inputting the first heavy medium gangue obtained in the step (3) into the gangue medium removing sieve 7 for medium removing and dewatering treatment to obtain a third qualified medium, a second dilute medium and heavy medium gangue serving as discharge;
(8) shunting the first qualified medium obtained in the step (4) by the shunting structure 9 to obtain a fourth qualified medium and a fifth qualified medium;
(9) inputting the second qualified medium obtained in the step (5), the first centrifugate obtained in the step (6), the second dilute medium obtained in the step (7) and the fifth qualified medium obtained in the step (8) into the magnetic separator 8 for medium recovery to obtain magnetic concentrate and magnetic tailings;
(10) inputting the first dilute medium obtained in the step (5), the third dilute medium obtained in the step (7), the fourth qualified medium obtained in the step (8) and the magnetic separation concentrate obtained in the step (9) into the qualified medium barrel 10, supplementing magnetite powder into the qualified medium barrel to obtain qualified replenishment medium, and feeding the qualified replenishment medium back to the narrow-size-fraction shallow-slot separator 3;
(11) inputting the magnetic separation tailings obtained in the step (9) into the concentration cyclone 11 for concentration to obtain a first concentration underflow and a first concentration overflow;
(12) inputting the first concentrated underflow obtained in the step (11) into the arc-shaped screen 12 for pre-dewatering to obtain oversize material and undersize slime water;
(13) inputting the oversize material obtained in the step (12) into the second centrifuge 13 for centrifugal dehydration to obtain a clean coal slime product and a second centrifugate;
(14) inputting the first concentrated overflow obtained in the step (11), the undersize slime water obtained in the step (12) and the second centrifugal liquid obtained in the step (13) into the deep cone thickener 14 for concentration to obtain a second concentrated underflow and a second concentrated overflow;
(15) inputting the second concentrated underflow obtained in the step (14) into the filter press 15 for filter pressing to obtain a coal slime product and a filtrate;
(16) conveying the second concentrated overflow obtained in the step (14), the filtrate obtained in the step (15) and clean water from the clean water tank 16 to the circulating water tank 17, and respectively feeding the second concentrated overflow, the filtrate and the clean water back to the clean coal medium removing sieve 5, the gangue medium removing sieve 7 and the qualified medium barrel 10;
(17) and (2) inputting the primary material with the particle size larger than 50mm obtained in the step (1) into the intelligent dry-method separator 18 for dry separation to obtain a large gangue block and a block clean coal product.
Examples 1-2(S1-2) and comparative examples 1-2(D1-2)
In example 1-2(S1-2), the treatment scale of the system was 6.00Mt/a in annual treatment amount; all raw coal is from Haerhu element open-pit mine; the primary grading sieve 1 is a 3.6 multiplied by 7 double-layer tension sieve, the aperture of the upper layer sieve pore is 50mm, and the aperture of the lower layer sieve pore is 3 mm; the secondary grading sieve 2 is a 3.0 multiplied by 10 single-layer relaxation sieve, and the aperture of a sieve hole is 3 mm; the aperture of the bottom flow plate opening of the narrow-grade shallow groove separator 3 is phi 6 mm; the aperture of the sieve pore of the fixed sieve 4 is 2 mm; the size of the screen slot/screen hole of the first centrifugal dehydrator 6 is 0.35 mm; the aperture of the screen hole of the gangue medium removing screen 7 is 0.5 mm; the grading particle size of the concentration cyclone 11 is 0.35 mm; the aperture of the sieve pore of the sieve bend 12 is 0.35 mm; the screen slots/holes of the second centrifuge 13 have a size of 0.35 mm.
As shown in FIG. 1, example 1-2(S1-2) uses the aforementioned method and system shown in FIG. 1 to perform 3mm deep separation on raw coal of power coal, and comprises the following steps:
(1) inputting raw coal of power coal into the primary grading sieve 1 to carry out primary grading with the diameter of 50mm and the diameter of 3mm in sequence to obtain a primary material with the particle size of more than 50mm, a primary material with the particle size of 3-50mm and a slack coal product with the particle size of less than 3 mm;
(2) inputting the primary material with the grain size of 3-50mm obtained in the step (1) into the secondary grading sieve 2 for secondary grading with the grain diameter of 3mm to obtain a secondary material with the grain size of 3-50mm and a slack coal product with the grain size of less than 3 mm;
(3) inputting the secondary material with the grain size of 3-50mm obtained in the step (2) into the narrow-grain-fraction shallow-groove separator 3 for phi 3mm shallow-groove separation to obtain first heavy medium clean coal and first heavy medium gangue;
(4) inputting the first heavy medium clean coal obtained in the step (3) into the fixed sieve 4 for pre-medium removal treatment to obtain second heavy medium clean coal serving as an oversize material and a first qualified medium serving as an undersize material;
(5) inputting the second dense medium clean coal obtained in the step (4) into the clean coal medium removing sieve 5 for carrying out phi 2mm secondary medium removing and dewatering and phi 25mm grading to obtain a second qualified medium and a first dilute medium with the particle size of less than 2mm, a third dense medium clean coal with the particle size of 2-25mm and a block clean coal product with the particle size of more than 25 mm;
(6) inputting the third dense medium clean coal obtained in the step (5) into the first centrifugal dehydrator 6 for centrifugal dehydration to obtain a first centrifugate and a clean coal product with the particle size of 2-25 mm;
(7) inputting the first heavy medium gangue obtained in the step (3) into the gangue medium removing sieve 7 for medium removing and dewatering treatment to obtain a third qualified medium, a second dilute medium and heavy medium gangue serving as discharge;
(8) shunting the first qualified medium obtained in the step (4) by the shunting structure 9 to obtain a fourth qualified medium and a fifth qualified medium;
(9) inputting the second qualified medium obtained in the step (5), the first centrifugate obtained in the step (6), the second dilute medium obtained in the step (7) and the fifth qualified medium obtained in the step (8) into the magnetic separator 8 for medium recovery to obtain magnetic concentrate and magnetic tailings;
(10) inputting the first dilute medium obtained in the step (5), the third dilute medium obtained in the step (7), the fourth qualified medium obtained in the step (8) and the magnetic separation concentrate obtained in the step (9) into the qualified medium barrel 10, supplementing magnetite powder into the qualified medium barrel to obtain qualified replenishment medium, and feeding the qualified replenishment medium back to the narrow-size-fraction shallow-slot separator 3;
(11) inputting the magnetic separation tailings obtained in the step (9) into the concentration cyclone 11 for concentration to obtain a first concentration underflow and a first concentration overflow;
(12) inputting the first concentrated underflow obtained in the step (11) into the arc-shaped screen 12 for pre-dewatering to obtain oversize material and undersize slime water;
(13) inputting the oversize material obtained in the step (12) into the second centrifuge 13 for centrifugal dehydration to obtain a clean coal slime product and a second centrifugate;
(14) inputting the first concentrated overflow obtained in the step (11), the undersize slime water obtained in the step (12) and the second centrifugal liquid obtained in the step (13) into the deep cone thickener 14 for concentration to obtain a second concentrated underflow and a second concentrated overflow;
(15) inputting the second concentrated underflow obtained in the step (14) into the filter press 15 for filter pressing to obtain a coal slime product and a filtrate;
(16) conveying the second concentrated overflow obtained in the step (14), the filtrate obtained in the step (15) and clean water from the clean water tank 16 to the circulating water tank 17, and respectively feeding the second concentrated overflow, the filtrate and the clean water back to the clean coal medium removing sieve 5, the gangue medium removing sieve 7 and the qualified medium barrel 10;
(17) and (2) inputting the primary material with the particle size larger than 50mm obtained in the step (1) into the intelligent dry-method separator 18 for dry separation to obtain a large gangue block and a block clean coal product.
Results
The values of the parameters of the raw coal for motive coal and the various products obtained therefrom used in examples 1 to 2(S1-2) are shown in tables 1 to 2, respectively.
Values of the parameters of the raw coal of the power coal and the various products obtained therefrom as used in Table 1S 1
Values of the parameters of the raw coal of the power coal and the various products obtained therefrom as used in Table 2S 2
In tables 1 and 2, the lump clean coal product includes the lump clean coal product obtained in step (5), the clean coal product obtained in step (6), the clean coal slurry product obtained in step (13), and the lump clean coal product obtained in step (17);
the slack coal product comprises the slack coal product obtained in the step (1) and the slack coal product obtained in the step (2);
the coal slurry product comprises the coal slurry product obtained in the step (15);
the commercial coal products include, in total, clean coal products, slack coal products, and coal slurry products.
Comparative example 1
Only the following differences with respect to example 1 were observed:
the primary grading sieve 1 is a 3.0 multiplied by 6.1 double-layer banana sieve, and the aperture of the sieve pore is 50/13 mm; the secondary grading sieve 2 is a 3.6 multiplied by 7.3 banana sieve with 13mm of aperture; the aperture of the opening of the bottom flow plate of the narrow-grade shallow slot separator 3 is 13 mm.
Comparative example 2
The following differences with respect to example 2 are only:
the primary grading sieve 1 is a common grading sieve, a 3.0 multiplied by 6.1 double-layer banana sieve and has the aperture of the sieve pore of 50/6 mm; the secondary grading sieve 2 is a 3.6 multiplied by 7.3 banana sieve with 6mm of aperture; the aperture of the opening of the bottom flow plate of the narrow-grade shallow-groove separator 3 is 13 mm.
Results
The values of the parameters of the raw coal for kinetic coal and the various products obtained in comparative examples 1 to 2(D1-2) are shown in tables 3 to 4, respectively.
Values for the values of the various products obtained from the raw coal of the power coal used in Table 3D 1
Values of the parameters for the raw coal of the power coal and the various products obtained therefrom as used in Table 4D 2
In tables 3 and 4, the clean coal products include the lump clean coal product obtained in step (5), the clean coal product obtained in step (6), the clean coal slurry product obtained in step (13), and the lump clean coal product obtained in step (17);
the slack coal product comprises the slack coal product obtained in the step (1) and the slack coal product obtained in the step (2);
the coal slurry product comprises the coal slurry product obtained in the step (15);
the commercial coal products include, in total, clean coal products, slack coal products, and coal slurry products.
Economic benefits
The three commercial coal products obtained in example 1 were prepared as quasi-mixed 4300, quasi-mixed 4900 and quasi-mixed 5200 commodities, respectively, with target calorific values of 4300, 4900 and 5200Kcal/kg, respectively, and the actual calorific values, yields, unit prices and annual sales revenue of each commodity are shown in table 5.
Actual calorific value, production volume, unit price and annual sales revenue for each of the commodities formulated in Table 5S 1
Note: kt/a means ten thousand tons/year.
The commercial coal products obtained in comparative example 1 were prepared as quasi-mixed 4000, quasi-mixed 4300, quasi-mixed 4900 and quasi-mixed 5200 products, respectively, with target calorific values of 4000, 4300, 4900 and 5200Kcal/kg, respectively, and the actual calorific values, yields, unit prices and annual sales revenue of each product are shown in table 6.
Actual heating value, production volume, unit price and annual sales revenue for each commodity formulated in Table 6D 1
Note: kt/a means ten thousand tons/year.
As is clear from Table 5, in example 1, the annual yield of commercial coal was 2573.86 ten thousand tons, and the annual sales income reached 669500.81 ten thousand yuan/year;
as can be seen from Table 6, in comparative example 1, the annual output of commercial coal was 2672.76 ten thousand tons, and the annual sales income reached 659489.68 ten thousand yuan/year;
as can be seen from a comparison between table 5 and table 6, although the annual yield of commercial coal in example 1 is reduced by 98.90 ten thousand tons, the overall annual sales revenue is increased by 10011.13 ten thousand yuan.
Example 1 achieves a great economic benefit compared to comparative example 1. Therefore, the method of the present application has great economic benefits.
Claims (10)
1. A method for powered coal 3mm deep separation, the method comprising:
(1) sequentially carrying out primary grading on raw coal of the power coal by phi 50mm and phi 3mm to obtain a primary material with the particle size larger than 50mm as a grading material with the particle size larger than 50mm, a primary material with the particle size of 3-50mm as a grading material with the particle size of 3-50mm and a slack coal product with the particle size smaller than 3 mm;
(2) carrying out shallow slot separation with the diameter of 3mm to 3mm on the classified material with the particle size of 3mm to 50mm obtained in the step (1) to obtain first heavy medium clean coal and first heavy medium gangue;
(3) sequentially carrying out medium removal and dehydration and phi 25mm classification on the first heavy medium clean coal obtained in the step (2) to obtain qualified medium and dilute medium with the particle size of less than 2mm, clean coal with the particle size of 2-25mm and block clean coal products with the particle size of more than 25 mm;
(4) and (3) carrying out dry separation on the classified materials with the particle size larger than 50mm obtained in the step (1) to obtain large gangue and lump clean coal products.
2. The method according to claim 1, characterized in that the primary material with the grain size of 3-50mm obtained in step (1) is subjected to secondary classification with a grain size of 3mm before being subjected to step (2), so that the secondary material with the grain size of 3-50mm is obtained to be used as classified material with the grain size of 3-50mm in step (2), and the final coal product with the grain size of <3 mm.
3. The method according to claim 1 or 2, wherein the first dense medium clean coal obtained in step (2) is subjected to pre-medium removal treatment to remove qualified medium before being subjected to step (3).
4. A method according to any one of claims or 1-3, wherein the system further comprises the following steps in sequence:
(5) performing medium removal and dehydration treatment on the first heavy medium gangue obtained in the step (2) to obtain qualified medium, dilute medium and heavy medium gangue serving as discharge;
(6) carrying out magnetic separation treatment on the dilute medium removed in the step (3) and the step (5) to recover the medium, so as to obtain magnetic concentrate and magnetic tailings;
(7) inputting the qualified medium removed in the step (3) and the step (5) and the magnetic concentrate obtained in the step (6) into a qualified medium barrel, supplementing magnetite powder into the qualified medium barrel to obtain qualified medium for replenishment, and returning the qualified medium for replenishment to the shallow groove separation device in the step (2);
(8) dehydrating the magnetic separation tailings obtained in the step (6) to obtain a clean coal slime product and coal slime water;
(9) sequentially concentrating and filter-pressing the slime water obtained in the step (8) to obtain slime and removed liquid;
(10) and (4) adding clear water into the liquid obtained in the step (9), and then respectively returning the liquid to the grading device in the step (3), the medium removal and dehydration device in the step (5) and the qualified medium barrel in the step (7).
5. The method according to claim 4, wherein the step (3) further comprises dewatering the obtained clean coal with the particle size of 2-25mm to obtain a clean coal product with the particle size of 2-25 mm.
6. The method of claim 4 or 5, wherein the dewatering treatment in step (8) comprises any one or more of concentration cyclone dewatering, sieve bend dewatering and centrifuge dewatering;
preferably, the dehydration treatment in the step (8) sequentially comprises concentration cyclone dehydration, sieve bend dehydration and centrifuge dehydration.
7. A system for 3mm deep separation of kinetic coal using the method of any one of claims 1 to 6.
8. The system of claim 7, wherein the system comprises:
the grading screen comprises a primary grading screen (1), the primary grading screen (1) is a double-layer screen and is used for sequentially carrying out primary grading of phi 50mm and phi 3mm on raw coal of power coal to obtain a primary material with the particle size of more than 50mm as a grading material with the particle size of more than 50mm, a primary material with the particle size of 3-50mm as a grading material with the particle size of 3-50mm and a slack coal product with the particle size of less than 3 mm;
the narrow-size-fraction shallow-groove separator (3) is connected with the classifying screen through a chute and is used for receiving classified materials with the particle size of 3-50mm from the classifying screen and performing shallow-groove separation with the particle size of phi 3mm on the classified materials to obtain first heavy medium clean coal and first heavy medium gangue;
the fixed sieve (4) is connected with the narrow-size-fraction shallow groove separator (3) through a chute and is used for receiving the first heavy medium clean coal from the narrow-size-fraction shallow groove separator (3) and performing pre-medium removal treatment on the first heavy medium clean coal to obtain second heavy medium clean coal serving as an oversize material and a first qualified medium serving as an undersize material;
the clean coal medium removing sieve (5) is connected with the fixed sieve (4) through a chute and is used for receiving second medium clean coal from the fixed sieve (4) and sequentially carrying out phi 2mm secondary medium removing dehydration and phi 25mm classification on the second medium clean coal to obtain a second qualified medium and a first dilute medium with the particle size of less than 2mm, third medium clean coal with the particle size of 2-25mm and a block clean coal product with the particle size of more than 25 mm;
the first centrifugal dehydrator (6) is connected with the clean coal medium-removing sieve (5) through a chute and is used for receiving third clean coal with the particle size of 2-25mm from the clean coal medium-removing sieve (5) and performing centrifugal dehydration on the third clean coal to obtain a first centrifugate and a clean coal product with the particle size of 2-25 mm;
the gangue medium-removing sieve (7) is connected with the narrow-grade shallow groove separator (3) through a chute and is used for receiving first heavy medium gangue from the narrow-grade shallow groove separator (3) and performing medium-removing dehydration treatment on the first heavy medium gangue to obtain a third qualified medium, a second dilute medium and heavy medium gangue serving as discharged materials;
the magnetic separator (8) is communicated with the fixed sieve (4), the clean coal medium removing sieve (5), the first centrifugal dehydrator (6) and the gangue medium removing sieve (7) through pipelines respectively, and a shunting structure (9) is arranged on the pipeline from the fixed sieve (4) to the magnetic separator (8); the flow dividing structure (9) is used for dividing the first qualified medium from the fixed screen (4) to obtain a fourth qualified medium and a fifth qualified medium; the magnetic separator (8) is used for receiving a first dilute medium from the clean coal medium removing sieve (5), a first centrifugal liquid from the first centrifugal dehydrator (6), a second dilute medium from the gangue medium removing sieve (7) and a fifth qualified medium from the shunting structure (9), and recovering the mediums to obtain magnetic concentrate and magnetic tailings;
the qualified medium barrel (10) is respectively connected with the clean coal de-media screen (5), the gangue de-media screen (7), the magnetic separator (8), the flow dividing structure (9) and the narrow-grade shallow groove separator (3) through pipelines, and is used for receiving a second qualified medium from the clean coal de-media screen (5), a third qualified medium from the gangue de-media screen (7), a magnetic concentrate from the magnetic separator (8) and a fourth qualified medium from the flow dividing structure (9), replenishing magnetite powder to obtain a qualified replenishment medium, and feeding the replenishment qualified medium back to the narrow-grade shallow groove separator (3);
the arc-shaped sieve (12) is connected with the magnetic separator (8) through a pipeline and is used for receiving the magnetic separation tailings from the magnetic separator (8) and pre-dehydrating the magnetic separation tailings to obtain oversize materials and undersize slime water;
the second centrifuge (13) is connected with the curved screen (12) through a chute and is used for receiving oversize materials from the curved screen (12) and centrifugally dewatering the oversize materials to obtain a dewatered clean coal slime product and a second centrifugate;
the deep cone thickener (14) is respectively connected with the curved screen (12) and the second centrifugal machine (13) through pipelines, and is used for receiving undersize coal slime from the curved screen (12) and second centrifugal liquid from the second centrifugal machine (13) and concentrating the undersize coal slime to obtain a second concentrated underflow and a second concentrated overflow;
the filter press (15) is connected with the deep cone thickener (14) through a chute, and is used for receiving and filter-pressing a second concentrated underflow from the deep cone thickener (14) to obtain a coal slime product and a filtrate;
a clean water tank (16) for providing clean water as make-up water;
the circulating water tank (17) is respectively connected with the clean coal scumming screen (5), the gangue scumming screen (7), the qualified medium barrel (10), the deep cone thickener (14), the filter press (15) and the clean water tank (16) through pipelines, and is used for receiving a second concentrated overflow from the deep cone thickener (14), a filtrate from the filter press (15) and clean water from the clean water tank (16) and supplying the second concentrated overflow, the filtrate and the clean water back to the clean coal scumming screen (5), the gangue scumming screen (7) and the qualified medium barrel (10);
the intelligent dry-method separator (18) is connected with the primary grading sieve (1) through a chute, and is used for receiving primary materials with the particle size larger than 50mm from the primary grading sieve (1) and performing dry separation on the primary materials to obtain large gangue and block clean coal products.
9. The system according to claim 8, characterized in that the classifying screen further comprises a secondary classifying screen (2), the secondary classifying screen (2) being a single-layer screen, the secondary classifying screen (2) being connected with the primary classifying screen (1) through a chute for receiving primary material of 3-50mm particle size from the primary classifying screen (1) and performing secondary classification of 3mm diameter to obtain secondary material of 3-50mm particle size as classified material of 3-50mm particle size and a slack coal product of <3mm particle size;
preferably, the system further comprises a concentration cyclone (11), the concentration cyclone (11) is arranged on a pipeline from the magnetic separator (8) to the curved screen (12) and is connected with the deep cone thickener (14) through a pipeline, and is used for receiving the magnetic tailings from the magnetic separator (8) and concentrating the magnetic tailings to obtain a first concentration underflow as the feed of the curved screen (12) and a first concentration overflow as the feed of the deep cone thickener (14).
10. The system according to claim 8 or 9, characterized in that the underflow plate opening aperture of the narrow fraction shallow slot classifier (3) is 6 mm.
Priority Applications (1)
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