CN110508393B - Method for reducing medium carrying of products of heavy medium coal separation plant - Google Patents
Method for reducing medium carrying of products of heavy medium coal separation plant Download PDFInfo
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- CN110508393B CN110508393B CN201910788434.5A CN201910788434A CN110508393B CN 110508393 B CN110508393 B CN 110508393B CN 201910788434 A CN201910788434 A CN 201910788434A CN 110508393 B CN110508393 B CN 110508393B
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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
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
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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
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/005—General arrangement of separating plant, e.g. flow sheets specially adapted for coal
Abstract
The invention provides a method for reducing medium carrying of products of a heavy medium coal separation plant, which comprises the following steps: the heavy medium sorted product is subjected to primary dehydration and medium removal through an arc screen and a linear vibrating screen; then enters an ore washing tank with an involute-type cross section; spraying the dilute medium section magnetic separation tailings of the primary linear vibrating screen along the tangential direction of the involute of the cross section of the ore washing groove and forming downstream flow with a solid product; feeding a medium and fine coal slime adhered to the surface of the solid product into a secondary linear vibrating screen under the impact of high-pressure circulating water; the front section of the secondary linear vibrating screen is added with water spray, the rear section is not provided with water spray, and the screen is fed into dewatering equipment to form a final product. The part under the front section sieve is fed into a special magnetic separator, and the part under the rear section sieve is fed into a thickener; the concentrate of the special magnetic separator returns to the qualified medium barrel, and the tailings enter the slime water treatment process. The invention utilizes the method of combining vibration medium removal and ore washing to re-pulp and secondarily sieve the heavy medium products, so that the heavy medium sorted products are fully separated from the medium, and the medium amount lost due to product carrying is effectively reduced.
Description
Technical Field
The invention belongs to the field of dense-medium coal separation, relates to a medium recovery process in a dense-medium coal separation process, and particularly relates to a method for reducing medium carrying capacity of products in a dense-medium coal separation plant.
Background
The dense medium coal separation method is a mainstream method for the existing coal processing, the medium consumption is the main cost of a dense medium coal separation plant, the dense medium consumption is an important technical index for examining the dense medium coal separation in the production of the dense medium coal separation plant, and the ton coal consumption of the medium directly influences the economic benefit of the coal separation plant. Due to the complexity of medium composition and the lack of pertinence of the production process of the coal preparation plant, many coal preparation plants have the problem of high medium consumption.
The technical medium consumption of the coal preparation plant mainly comprises two parts, namely a final product and a medium carried away by tailings of a magnetic separator. In the long-term production and research process, researchers have conducted a great deal of research on media taken away by tailings of a magnetic separator, and various solutions such as magnetic separator feeding control, multiple magnetic separation and control shunting are provided.
The countermeasures for reducing the medium carried away by the end product are mainly focused on ways of increasing the effect of the water spray and increasing the residence time of the material on the screen surface. If some coal preparation plants reform the feeding elbow of the sieve bend into a box-type integral chute, a turbulent flow plate is added in the chute, the materials are uniformly fed along the whole width of the sieve bend, impurities in the fed materials can be timely cleaned, the blockage of a feeding pipeline is avoided, the condition that the material is not mixed on the surface of the sieve is ensured, and the one-time medium removing efficiency is greatly improved. In order to improve the water spraying effect, on the premise of ensuring the water spraying pressure, 3 paths of parallel water spraying pipelines are additionally arranged in some coal preparation plants, and a front row and a rear row of crossed flat shovel type fan-shaped nozzles are arranged and used in each pipeline. In some coal preparation plants, the medium removing sieve plate is replaced by a sieve plate with a weir plate, so that the advancing speed of the material is reduced, the retention time of the material on the sieve surface is prolonged, and the quantity of media taken away by coal flow is reduced.
With the deepening of the energy-saving and consumption-reducing requirements of the coal preparation plant, the existing heavy-medium coal preparation plant has a relatively single medium mode for reducing the medium taken away by the final product, and how to deeply reduce the medium carrying amount of the heavy-medium product from the aspect of process strengthening means needs to be further researched.
Disclosure of Invention
The invention provides a method for reducing medium carried by products of a heavy-medium coal separation plant, aiming at the problem that the quantity of medium carried by clean coal products is higher in the existing heavy-medium coal separation process.
The method comprises the following steps:
a method for reducing the carrying media of products in a heavy medium coal separation plant comprises the following steps:
(1) heavy medium separation products (clean coal, middlings or gangue) of a coal preparation plant are respectively dewatered and medium removed through respective arc sieves and a primary linear vibrating screen;
(2) combining the qualified medium sections under the sieve of the arc sieve and the sieve of the primary linear vibrating sieve, then feeding the combined sections into a flow dividing device for flow dividing, feeding one part of the combined sections into a qualified medium barrel, and combining the other part of the combined sections with the dilute medium section under the sieve of the primary linear vibrating sieve and feeding the combined sections into a magnetic separator;
(3) feeding materials on a primary linear vibrating screen into an ore washing tank with an involute-type cross section;
(4) feeding the concentrate of the magnetic separator into a qualified medium barrel, spraying the magnetic separation tailings through a high-pressure nozzle along the tangential direction of the involute of the cross section of the ore washing tank and forming a downstream flow with the material on the primary linear vibrating screen;
(5) under the impact of high-pressure circulating water, fully dispersing media and fine coal slime adhered to the surface of a solid product in the ore washing tank, and then feeding the medium and the fine coal slime into a secondary linear vibrating screen under the action of inertia;
(6) adding water spray at the front section of the secondary linear vibrating screen, and further removing the medium and fine mud to enter the part below the screen; the rear section is not provided with water spray, and the screen is fed into dewatering equipment to form a final product;
(7) feeding the undersize part at the front section of the secondary linear vibrating screen into a special magnetic separator, and feeding the undersize part at the rear section of the secondary linear vibrating screen into a thickener; the concentrate of the special magnetic separator returns to the qualified medium barrel, and the tailings enter the slime water treatment process.
Preferably, the cross section of the ore washing tank is in a circular involute shape, the end with a large involute slope is a feeding end, and the end with a small involute slope is a discharging end. The involute-type ore washing tank has smooth material flow and no material accumulation.
Preferably, the base radius of the involute is 20 cm.
Preferably, the inclination angle of the screen surface of the primary linear vibrating screen is positive, namely the discharge end is lower than the feeding end, and the primary linear vibrating screen can automatically flow on the screen to enter the ore washing tank.
Preferably, the inclination angle of the screen surface of the secondary linear vibrating screen is a negative value, namely the discharging end is higher than the feeding end.
Preferably, the screen surface inclination is 5-10 °.
Preferably, the amplitude and frequency of the secondary linear vibrating screen are higher than those of the primary linear vibrating screen by at least 50%.
Preferably, the screen hole of the secondary linear vibrating screen is 0.5 mm.
Preferably, the magnetic separation equipment for feeding the product below the secondary linear vibrating screen is a strong magnetic separator, preferably a double-roller magnetic separator, and the magnetic field intensity is 1800-2000 GS.
Preferably, the front section is 2/3 part before the secondary linear vibration screen, and the rear section is 1/3 part after the secondary linear vibration screen.
Has the advantages that: the heavy medium product is subjected to primary medium removal screening treatment and then fed into an ore washing tank for secondary pulp making. The medium and the fine coal slime adsorbed on the surface of the product are fully overturned, desorbed and desorbed from the surface of the product under the dilution and impact action of high-pressure circulating water, and enter flowing ore pulp. And screening by using a secondary linear vibrating screen, and deeply removing water entering the screen under the action of 2/3 flushing water in front of the secondary linear vibrating screen. And the 1/3 part behind the secondary linear vibrating screen is not added with water spray, so that the product moisture is further reduced, and the treatment pressure of subsequent dehydration equipment is reduced. The scheme is based on the mode of combining pulping, diluting and multiple times of vibration dewatering, ensures that the product takes away the deep removal of the medium, can effectively reduce the medium carrying amount of the product in the reselection process, reduces the whole medium consumption of the coal preparation plant, and ensures the quality of the clean coal product.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a flow chart of a coal preparation process according to an embodiment of the method of the present invention;
reference numbers in the figures: a-a curved screen; b, primary linear vibrating screen; c-washing the ore tank; d-secondary linear vibrating screen; e-qualified medium barrel; f, a coal slime barrel; g-a magnetic separator; h-special magnetic separator; i-a dewatering device; a J-splitter; k-thickener
Detailed Description
As shown in figure 1 of the drawings, in which,
dewatering and medium removing are carried out on the heavy medium sorted product through an arc screen A and a primary linear vibrating screen B;
automatically flowing on the primary linear vibrating screen B into an ore washing tank C with an involute cross section;
combining qualified medium sections under the sieve of the arc sieve A and the sieve of the primary linear vibrating sieve B, then entering a flow dividing device J for flow dividing, entering a qualified medium barrel E by a part, and combining the part and a dilute medium section under the sieve of the primary linear vibrating sieve B and feeding the combined part to a magnetic separator G;
feeding magnetic concentrate of the magnetic separator G into the qualified medium barrel E, and feeding magnetic tailings into the ore washing tank C and materials on the primary linear vibrating screen B to form concurrent flow through a pressure pump along the tangential direction of the involute of the cross section of the ore washing tank C;
under the impact of high-pressure circulating water, fully dispersing a medium and fine coal slime adhered to the surface of a material on a screen of the primary linear vibrating screen B, feeding the medium and the fine coal slime into a secondary linear vibrating screen D under the action of inertia, and feeding the medium and the fine coal slime on the screen into dewatering equipment I to obtain a final product;
and water spray is added to the 2/3 part in front of the secondary linear vibrating screen D, and the medium and the fine mud are further removed to enter the screen below and are fed into a special magnetic separator H. The rear 1/3 part is not provided with water spray, and is fed into a thickener K under a screen;
and (4) feeding the magnetic concentrate of the special magnetic separator H into the qualified medium barrel E, and feeding the magnetic tailings into the coal slime barrel F.
As shown in figure 1, the feeding end of the ore washing tank is the intersection point of the horizontal diameter of the involute base circle and the involute, the discharging end of the ore washing tank is the intersection point of the tangent line at the lower end of the involute base circle and the involute, materials enter the ore washing tank from a section with a larger involute slope and are discharged from the ore washing tank from a section with a smaller involute slope. The height difference exists between the feeding end and the discharging end of the ore washing tank, and the height difference is the radius of the base circle. The feeding section of the ore washing tank is connected with the discharging end of the primary linear vibrating screen, and the discharging end of the ore washing tank is connected with the feeding end of the secondary linear vibrating screen.
FIG. 2 is a flow chart of a coal preparation process according to an embodiment of the method of the present invention.
The coal preparation plant is a 4.0Mt/a coking coal preparation plant, raw coal directly enters 2 3GDMC1200/850 model pressure three-product heavy medium cyclones and is divided into three products of clean coal, middlings and gangue.
The original process of the plant comprises the following steps: the heavy medium separation product is dehydrated and de-medium by an FH1520 type arc sieve (phi is 0.5mm) and a ZKS3075 type linear vibrating sieve (phi is 0.5mm), and then is fed into a WZL1400 horizontal vibrating centrifuge for dehydration to form a final product, the process is simple, and the content of magnetic substances in the material on the sieve of the de-medium sieve is high.
After passing through the flow dividing device, one part of qualified media under the screen of the linear vibrating screen is fed into the qualified media barrel, the other part of the qualified media and undersize dilute media are combined and fed into a 2CTXN1030 roller magnetic separator with the magnetic field intensity of 1500GS, magnetic concentrate is fed into the qualified media barrel, and magnetic tailings are fed into the coal slime barrel.
The technology after technical transformation comprises the following steps: the heavy medium separation product is dehydrated and medium removed once by an FH1520 type sieve bend (phi is 0.5mm) and a ZKS3075 type linear vibration sieve (phi is 0.5mm), and then automatically flows into an ore washing tank with an involute cross section, and the radius of an involute base circle is 20 cm. 10 flat nozzle spray heads with the minimum distance of 10mm are arranged at the upper part of the ore washing tank for spraying water, and the water spraying pressure is 0.1 MPa. Under the impact of high-pressure circulating water, the medium and fine coal slime adhered to the surface of the heavy medium separation product are fully dispersed and fed into a ZKS3075 type secondary linear vibration sieve (phi is 0.5mm) for secondary dehydration and medium removal under the action of inertia. The discharge end of the secondary linear vibrating screen is higher than the feed end, and the inclination angle of the screen surface is 5 degrees upwards. 3 water sprays are arranged at the front 2/3 part of the secondary linear vibrating screen, and no water spray is arranged at the rear 1/3 part.
After passing through a flow dividing device, one part of qualified medium under the screen of the primary linear vibrating screen is fed into a qualified medium barrel, the other part of the qualified medium and undersize dilute medium are combined and fed into a 2CTXN1030 roller magnetic separator with the magnetic field intensity of 1500GS, magnetic concentrate is fed into the qualified medium barrel, and magnetic tailings are fed into a washing tank through a pressure pump.
Feeding the oversize products of the secondary linear vibrating screen into a WZL1400 horizontal vibrating centrifuge for dehydration to form final products, feeding 2 XCTN-1024 double-roller magnetic separator with the magnetic field intensity of 2000GS to recover media under the screen of the front 2/3 part, feeding magnetic concentrate into a qualified medium barrel, feeding magnetic tailings into a coal mud barrel, and feeding the undersize products of the rear 1/3 part into a thickener.
After the operation of the technical transformation system is stable, the CXG-90A type magnetic separation tube is used by the plant to detect the content of the magnetic substances in the materials on the secondary linear vibrating screen, and the magnetic separation tube is compared with the materials before the technical transformation. The results are shown in Table 1.
TABLE 1 Sieve material belt medium experiment table (maximum value) for medium-removing sieve
As can be seen from Table 1, after the scheme is implemented, the content of the magnetic substances in the heavy medium separation product on the medium removing sieve is reduced to below 1%, wherein the content of the magnetic substances in clean coal is reduced by 38.39%, the content of the magnetic substances in middlings is reduced by 39.83%, and the content of the magnetic substances in gangue is reduced by 43.62%. The scheme guarantees the product quality and effectively reduces the medium consumption.
Claims (10)
1. A method for reducing the carrying media of products in a heavy medium coal separation plant is characterized by comprising the following steps:
(1) the heavy medium separation product of the coal preparation plant is dehydrated and medium removed through an arc screen and a primary linear vibrating screen;
(2) qualified medium sections under the sieve of the arc sieve and the sieve of the primary linear vibrating sieve enter a flow dividing device for flow dividing, one part of the qualified medium enters a qualified medium barrel, and the other part of the qualified medium enters a magnetic separator together with a dilute medium section under the sieve of the primary linear vibrating sieve;
(3) feeding the materials on the primary linear vibrating screen into an ore washing tank;
(4) feeding the concentrate of the magnetic separator into a qualified medium barrel, and feeding the magnetic separation tailings into a washing tank;
(5) under the impact of high-pressure circulating water, fully dispersing media and fine coal slime adhered to the surface of a solid product in the ore washing tank, and then feeding the medium and the fine coal slime into a secondary linear vibrating screen under the action of inertia;
(6) adding water spray at the front section of the secondary linear vibrating screen, and further removing the medium and fine mud to enter the part below the screen; the rear section is not provided with water spray, and the screen is fed into dewatering equipment to form a final product;
(7) feeding the undersize part at the front section of the secondary linear vibrating screen into a special magnetic separator, and feeding the undersize part at the rear section of the secondary linear vibrating screen into a thickener; the concentrate of the special magnetic separator returns to the qualified medium barrel, and the tailings enter the slime water treatment process.
2. The method of claim 1, wherein the cross-sectional shape of the sluice is an involute of a circle, and the end with a large involute slope is a feeding end and the end with a small involute slope is a discharging end.
3. The method of claim 2, wherein the base radius of the involute is 20 cm.
4. The method of claim 2, wherein the tailings of the magnetic separator are injected through the high pressure nozzle in a tangential direction of the involute of the cross section of the launder and form a concurrent flow with the material on the primary linear vibrating screen.
5. The method of claim 1, wherein the secondary linear vibrating screen has a negative screen surface inclination, i.e., the discharge end is higher than the feed end.
6. The method of claim 4, wherein the screen face angle is 5-10 °.
7. The method of claim 1, wherein the secondary linear vibrating screen has a higher amplitude and frequency than the primary linear vibrating screen.
8. The method for reducing the carrying medium of the products of the heavy-medium coal separation plant according to claim 1, wherein the screen hole of the secondary linear vibrating screen is 0.5 mm.
9. The method for reducing the carrying amount of the medium in the products of the heavy-medium coal separation plant as claimed in claim 1, wherein the magnetic separation equipment for feeding the products under the secondary linear vibrating screen is a strong magnetic separator, and the magnetic field strength is 1800-.
10. The method of claim 1, wherein the front section is a front 2/3 part of the secondary linear vibrating screen, and the rear section is a rear 1/3 part of the secondary linear vibrating screen.
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- 2019-08-26 CN CN201910788434.5A patent/CN110508393B/en active Active
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| CN1212906A (en) * | 1998-10-16 | 1999-04-07 | 詹尼塞斯研究公司 | Coal cleaning process |
| CN102553703A (en) * | 2012-01-12 | 2012-07-11 | 中国矿业大学 | Coal slime treatment process for deslimed dense-medium coal separation |
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