CN112156885B - Process for recycling coarse slime in qualified medium - Google Patents
Process for recycling coarse slime in qualified medium Download PDFInfo
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- CN112156885B CN112156885B CN202010822998.9A CN202010822998A CN112156885B CN 112156885 B CN112156885 B CN 112156885B CN 202010822998 A CN202010822998 A CN 202010822998A CN 112156885 B CN112156885 B CN 112156885B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004064 recycling Methods 0.000 title description 3
- 239000003245 coal Substances 0.000 claims abstract description 85
- 239000006148 magnetic separator Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000012141 concentrate Substances 0.000 claims abstract description 8
- 238000005188 flotation Methods 0.000 claims abstract description 7
- 230000018044 dehydration Effects 0.000 claims abstract description 6
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 3
- 239000002609 medium Substances 0.000 description 41
- 238000000926 separation method Methods 0.000 description 16
- 239000000203 mixture Substances 0.000 description 8
- 239000002956 ash Substances 0.000 description 4
- 238000007885 magnetic separation Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 208000005156 Dehydration Diseases 0.000 description 3
- 239000002245 particle Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000012736 aqueous medium Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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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
-
- 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
-
- 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
-
- 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
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
Landscapes
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
本发明提供一种回收合格介质中粗煤泥的工艺：包括以下步骤：原煤经过重介旋流器分选后精煤给入弧形筛和直线振动筛脱水脱介；弧形筛筛下与直线振动筛一段筛下成为合格介质；精煤合格介质采用弧形筛分级分为筛上物和筛下物；筛上物和循环水进入磁选机分为精矿和尾矿；磁选机尾矿进入高频筛分为筛上物和筛下物；高频筛筛上物给入煤泥离心机脱水；脱水后的产物掺入精煤；弧形筛筛下物和磁选机精矿合并进入合格介质桶；高频筛筛下物和煤泥离心机离心液进入浮选环节。本发明利用重介旋流器下限低的特点，采用分级方法直接回收合格介质中的粗煤泥，减少合格介质中的煤泥循环，降低粗煤泥处理环节压力。
The invention provides a process for recovering coarse slime in a qualified medium, which comprises the following steps: raw coal is sorted by a heavy medium cyclone, and the clean coal is fed into an arc screen and a linear vibrating screen for dehydration and deintermediation; The first stage of the linear vibrating screen becomes qualified medium; the qualified medium of clean coal is classified into oversize and undersize by arc sieve; oversize and circulating water enter the magnetic separator to be divided into concentrate and tailings; magnetic separator The tailings enter the high-frequency sieve and are divided into oversize and undersize; the oversize of the high-frequency sieve is fed into the slime centrifuge for dehydration; the dehydrated product is mixed with clean coal; the undersize of the arc sieve and the magnetic separator are refined. The ore is merged into the qualified medium barrel; the high-frequency screen and the centrifugal liquid of the slime centrifuge enter the flotation process. The invention utilizes the feature of the low lower limit of the heavy medium cyclone, adopts the classification method to directly recover the coarse slime in the qualified medium, reduces the circulation of the slime in the qualified medium, and reduces the pressure of the coarse slime treatment link.
Description
Technical Field
The invention belongs to the field of coal reselection, relates to a coarse coal slime recovery process, and particularly relates to a process for recovering coarse coal slime in a qualified medium.
Background
The coarse coal slime is raw coal with the granularity between the lower reselection limit and the upper flotation limit, the granularity ranges from 0.25mm to 3mm, the coarse coal slime is developed from simple recovery to fine separation along with the reduction of the quality of the raw coal and the popularization of a large-diameter dense medium cyclone, and a plurality of new devices and processes are generated.
The raw materials of the existing coarse slime separation process generally come from screen underflow of a desliming screen and magnetic separation tailings of clean coal, coking coal generally adopts a TBS aqueous medium separation process, and power coal generally adopts a spiral separator separation process. And because the qualified clean coal medium is usually returned to the qualified medium barrel and then fed into the dense medium cyclone for recycling, coarse coal slime in the qualified clean coal medium is always circulated in the dense medium system. On one hand, the coarse slime generates secondary slime circularly, and the treatment pressure of slime water is increased. On the other hand, coarse slime is lost and enters flotation, and the flotation production cost is high, so that the separation cost is increased. In addition, the coarse coal slime is a component of the dense medium suspension, and theoretically, the maximum particle size of particles in the suspension is above 1/5 of the separation lower limit of the dense medium cyclone, so that the stability of the suspension is deteriorated due to excessive coarse coal slime in the dense medium suspension, and the separation effect is influenced.
Many scholars have investigated the properties of each sample in the separation process of the dense medium cyclone, and point out that the separation lower limit of the dense medium cyclone is about 0.25mm generally, and the coarse coal slime ash content in the qualified medium can meet the requirement of clean coal ash content generally. In the existing dense-medium coal separation process, the coarse coal slime is passively discharged into a coarse coal slime separation link only by continuously adding raw materials. Obviously, the part of the coal slime is repeatedly sorted, and the sorting precision of the water medium is lower, so that the coarse coal slime which can be directly mixed with clean coal is lost to a certain degree.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a process for recovering coarse coal slime from qualified media, which can directly recover coarse coal slime from qualified media of clean coal of a dense medium cyclone and mix the coarse coal slime into the clean coal.
In order to achieve the purpose, the invention adopts the following technical scheme:
a process for recovering coarse slime from qualified media of power coal comprises the following steps:
step 1: separating raw coal into clean coal, middlings and gangue products after being sorted by a dense medium cyclone;
step 2: the cleaned coal enters a first sieve bend and a linear vibrating screen for medium removal, and qualified medium sections below the first sieve bend and the linear vibrating screen are mixed to serve as qualified media;
and step 3: the qualified medium of clean coal enters a second arc-shaped sieve to be classified into oversize products and undersize products;
and 4, step 4: mixing oversize products of the second sieve bend and circulating water, and feeding the mixture into a magnetic separator to separate the mixture into concentrate and tailings;
and 5: the tailings of the magnetic separator enter a high-frequency screening mode to be screened into oversize products and undersize products;
step 6: feeding the oversize material of the high-frequency sieve into a coal slime centrifugal machine for dewatering;
and 7: mixing the product of the coal slime centrifuge with clean coal;
and 8: combining the undersize of the second sieve bend and the concentrate of the magnetic separator and feeding the mixture into a qualified medium barrel;
and step 9: and (4) enabling undersize products of the high-frequency sieve and centrifugal liquid of the coal slime centrifugal machine to enter a flotation link.
Preferably: the mixing ratio of the oversize material of the second sieve bend and the circulating water is 1: 9-3: 7
Preferably: the diameter of the raw coal dense medium cyclone is 800-1200 mm.
Preferably: and (3) screen holes for medium removal of the first arc-shaped screen and the linear vibrating screen in the step (2) are 1-2 mm.
Preferably: and in the step 3, the sieve hole of the second sieve bend is 0.2mm-0.35 mm.
Has the advantages that: coarse coal slime in qualified clean coal media of the dense medium cyclone has good quality, and the coarse coal slime is not timely recovered in the prior art, so that repeated separation and clean coal resource loss are caused. The scheme utilizes a core process of grading-magnetic separation to directly recycle and mix the coarse slime into clean coal. The treatment pressure of the subsequent coarse slime separation link is reduced, the stability of qualified media is improved, and the treatment of slime water is facilitated.
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 first sieve bend; b, a linear vibrating screen; c-a second sieve bend; d-a magnetic separator; e-high frequency screening; f-clean coal slime centrifuge; g-qualified medium barrel; an H-slurry preparer.
Detailed Description
In order to make the technical method of the invention easily understood, the technical scheme of the invention is described by using specific examples with reference to the attached drawings. It should be noted that the embodiments described herein are only some embodiments of the present invention, and not all implementations of the present invention, and the purpose of the embodiments is only to provide the examiner and the public with a more intuitive and clear understanding of the present invention, and not to limit the technical solutions of the present invention. All other embodiments, as well as other simple substitutions and various changes to the technical solutions of the present invention, which can be made by those skilled in the art without inventive work, are within the scope of the present invention without departing from the spirit of the present invention.
The process of the present invention is further described below with reference to the accompanying drawings:
the invention comprises a fine coal qualified medium grading link, a magnetic separation medium removing link and a coarse coal slime dehydration link.
FIG. 1 is a schematic flow chart of the method of the present invention, in which raw coal is separated into clean coal, middlings and gangue products after heavy media separation; the clean coal is respectively treated by a first sieve bend A and a linear vibrating screen B;
mixing qualified medium sections below the sieve A of the first arc-shaped sieve and the sieve B of the linear vibrating sieve to be used as qualified media;
the qualified medium of clean coal enters a second sieve bend C, oversize products of the second sieve bend C and circulating water are mixed and enter a magnetic separator D to be divided into concentrate and tailings;
the tailings of the magnetic separator D enter a high-frequency sieve E for primary dehydration, and a coal slime centrifuge F is fed on the sieve for secondary dehydration and then is doped with clean coal;
combining undersize of the second sieve C and concentrate of the magnetic separator D, and feeding the mixture into a qualified medium barrel G;
and (4) enabling undersize products of the high-frequency sieve E and centrifugal liquid of the coal slime centrifugal machine F to enter a pulp preparer H.
Fig. 2 is a flow chart of a partial coal preparation process according to an embodiment of the present invention, the coal preparation plant is a 3.0Mt/a power coal preparation plant, raw coal enters 2 heavy medium cyclones with 1200/850 diameters for separation and separation of clean coal, medium coal and gangue products, wherein the ash content of the clean coal is required to be less than 5%.
The cleaned coal sieve bend and the straight line medium removing sieve anterior segment are qualified medium, through the coal slime sample analysis to the qualified medium bucket of cleaned coal, obtain the coal slime granularity and constitute as shown in table 1:
TABLE 1 coal slime size composition in clean coal qualified media
As can be seen from the above table, the content of the +0.25mm part in the qualified medium is up to 87.41%, and the ash content is 4.05%, so that the qualified medium meets the requirement of the ash content serving as clean coal, and the qualified medium is prevented from being circulated and recovered as soon as possible.
Based on the method, the factory feeds qualified media into an arc screen with the screen hole diameter of 0.25mm, a magnetic separation feeding barrel is fed on the sieve of the arc screen, and circulating water is added into the barrel and is regulated to reduce the pulp concentration to 200 g/l; then pumping to a roller magnetic separator for medium removal; dewatering tailings of the magnetic separator by a high-frequency sieve and a coal slime centrifugal machine, and then adding clean coal; combining the undersize of the sieve with the concentrate of the magnetic separator and returning the mixture to the qualified medium barrel; and (4) enabling the undersize of the high-frequency sieve and the centrifugal liquid of the coal slime centrifugal machine to enter a pulp preparer and enter the next flotation link.
By adopting the scheme, coarse coal slime in qualified media is recovered in time, and the on-site total clean coal yield is improved by about 5%.
Claims (1)
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| CN202010822998.9A CN112156885B (en) | 2020-08-17 | 2020-08-17 | Process for recycling coarse slime in qualified medium |
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| CN202010822998.9A CN112156885B (en) | 2020-08-17 | 2020-08-17 | Process for recycling coarse slime in qualified medium |
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| CN112156885B true CN112156885B (en) | 2021-11-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113877717B (en) * | 2021-09-03 | 2024-10-15 | 华北科技学院(中国煤矿安全技术培训中心) | Fine coal dense medium separation and floatation combined separation method |
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