CN111437986A - Coal dressing process for on-line recovery of high-ash clean coal from medium coal - Google Patents
Coal dressing process for on-line recovery of high-ash clean coal from medium coal Download PDFInfo
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- CN111437986A CN111437986A CN202010233075.XA CN202010233075A CN111437986A CN 111437986 A CN111437986 A CN 111437986A CN 202010233075 A CN202010233075 A CN 202010233075A CN 111437986 A CN111437986 A CN 111437986A
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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
- B03B5/32—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions using centrifugal force
- B03B5/34—Applications of hydrocyclones
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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 discloses a coal dressing process for on-line recovery of high-ash clean coal from middlings, which is characterized in that a second-section cyclone of a two-section heavy-medium coal dressing system is replaced by a pressure three-product cyclone, raw coal is firstly separated into low-ash clean coal and medium-gangue mixture by using the pressure two-product cyclone, and the medium-gangue mixture obtains the high-ash clean coal, the medium gangue and the medium coal by using the pressure three-product cyclone, so that the whole system can simultaneously produce four products of the low-ash clean coal, the high-ash clean coal, the medium coal and the medium gangue on line, the separation precision and index are met, the recovery rate of the clean coal is improved, and scarce coal is fully recovered.
Description
Technical Field
The invention relates to the field of separation processes in coal mine coal preparation plants, in particular to a coal preparation process for on-line separation and recovery of high-ash clean coal from middlings.
Background
The traditional coal separation process, whether a jigging method or a dense medium method, generally adopts a coal separation process of a three-product medium cyclone or a two-section two-product dense medium cyclone except coal slurry, wherein the three-product dense medium cyclone adopts a set of medium system, the two-section cyclone is in a series structure, and three products, namely clean coal, middlings and gangue, are separated by utilizing a centrifugal separation principle; under the action of centrifugal force, the raw coal entering the two-product heavy medium cyclone is separated according to the physical principle of Archimedes' law, the clean coal is discharged and collected from the overflow ports of the two-product heavy medium cyclone, the bottom flow is a medium gangue mixture, the medium gangue mixture is separated again by using the two-product cyclone, the medium coal is discharged and collected from the overflow ports, and the gangue is discharged and collected from the bottom flow ports of the two-product heavy medium cyclones.
From the aspect of application, the clean coal can be divided into coking clean coal for smelting and other coking clean coal. The coking clean coal for smelting has the granularity of less than 50 mm, 80 mm and 100 mm, and ash content of less than or equal to 12.5 percent, which is called smelting clean coal for short; the other coking clean coals are also divided into three types with the granularity of less than 50 mm, 80 mm and 100 mm, and the ash content is between 12.5 percent and 16 percent, which are called other clean coals for short. The invention relates to smelting clean coal.
The existing process for selecting coal by smelting clean coal generally adopts two-section two-product dense medium cyclones, and has the problems that the content of low-density substances (-1.4 kg/L) in the produced medium coal product is higher due to lower separation density of dense media, and through analysis of medium coal screening float-sink test data, the content of materials with density grade less than 1.4 kg/L in the medium coal is up to 20% -30%, and the content of materials with density grade more than 1.8 kg/L in the medium coal is over 13%, when the content of clean coal ash is 8.5%, the content of materials with density grade less than 1.4 kg/L in the medium coal is over 11%, and the content of materials with density grade more than 1.8 kg/L is over 15%.
In order to more reasonably utilize high-quality coking coal resources, the part of the middlings should be further sorted into high-ash smelting clean coal with ash content of 10-12% and middlings products.
Object of the Invention
The invention aims to invent a process method on the basis of the existing two-section two-product heavy-medium coal separation process flow, realize three-product separation of a medium gangue mixture of two pressed products, and directly produce a separation process of high-ash clean coal, medium coal and gangue through a recleaning system on the basis of producing low-ash clean coal by a main separation system.
In order to achieve the purpose, the invention adopts the technical scheme that:
the first step is as follows: heavy-medium coal separation system with built pressure two-product cyclone and pressure three-product cyclone
The heavy medium coal separation system has the structure that: replacing a second-section cyclone of the existing two-section two-product heavy medium coal separation system with a pressure three-product cyclone, wherein the separation pressure is not lower than 0.25MPA, so that the heavy medium coal separation system formed by connecting the pressure two-product cyclone and the pressure three-product cyclone in series is established, and the processing capacity and the separation precision meet the technical requirements;
the second step is that: the method comprises the following steps of (1) carrying out coal dressing by using the established dense medium coal dressing system:
(1) raw coal is classified by a classifying screen, enters a mixing barrel, is pumped into a pressurized two-product cyclone by a mixing pump for separation, the overflow of the cyclone is subjected to medium removal and dehydration and then is used as a low-ash clean coal product, and the underflow of the cyclone is subjected to simple medium removal and dehydration and then is used as a medium gangue mixture;
(2) the medium-gangue mixture enters a re-washing mixing barrel, a pressure three-product heavy medium cyclone is driven by a mixing pump to perform separation, the cyclone overflows into a clean coal medium removal sieve for medium removal, medium coal enters a medium coal medium removal sieve for medium removal, gangue enters a gangue medium removal sieve for medium removal, the medium coal enters a medium coal transfer belt after being dehydrated by a centrifugal machine, the clean coal is collected by a scraper conveyer and then enters a centrifugal machine for dehydration, and the clean coal enters a high-ash clean coal transfer belt after being dehydrated and is transported to a product bin.
The invention has the beneficial effects that:
the invention changes the existing two-section two-product heavy medium cyclone coal separation system into a coal separation system consisting of a two-product heavy medium cyclone and a pressure three-product heavy medium cyclone, firstly uses the pressure two-product cyclone to separate raw coal into low-ash clean coal and medium gangue mixture, uses the pressure three-product cyclone to obtain high-ash clean coal, gangue and medium coal from the medium gangue mixture, realizes the on-line production of four products of low-ash clean coal, high-ash clean coal, medium coal and gangue simultaneously, meets the separation precision and index, improves the recovery rate of clean coal, and fully recovers the scarce coal.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, the drawings in the following description are only schematic diagrams of one embodiment of the present invention, and it is obvious for those skilled in the art that other similar drawings can be obtained according to the drawings.
FIG. 1 is a block diagram of a process flow according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.
The embodiment takes a certain coal preparation plant of a new mine group as an example, and the currently adopted main coal preparation process of the coal preparation plant is as follows: the method comprises the steps of desliming raw coal of 50-0mm in advance, separating clean coal and gangue mixture of 50-1mm from the raw coal of 50-1mm by using a two-product heavy medium cyclone, and separating the middlings and the gangue by using a two-product heavy medium cyclone. There are problems: the clean coal products selected by the coal preparation plant are six-grade and seven-grade smelting clean coal, the calorific value of the middlings products is up to 4500-:
the first step is as follows: pre-desliming 50-0mm of raw coal, and screening to obtain 50-1mm of raw coal;
the second step is that: after 50-1mm of raw coal enters a mixing barrel, entering a pressure two-product cyclone for separation to obtain a mixture of overflow products, namely 1# clean coal and underflow products, and medium and waste rocks;
the third step: and (3) feeding the medium-waste mixture into a re-washing mixing barrel, pumping the mixture into a pressure three-product heavy medium cyclone by a mixing pump for separation, controlling the separation pressure to be 0.25-0.34MPA, controlling the separation density to be about 1.450g/l, overflowing the mixture into a 3# clean coal de-medium screen for de-medium, feeding the medium coal into a medium coal de-medium screen for de-medium, feeding the waste rock into a waste rock de-medium screen for de-medium, dehydrating the medium coal by a centrifuge, then feeding the medium coal into a medium coal transferring belt, collecting the 3# clean coal by a scraper conveyer, then feeding the concentrated coal into a centrifuge for dehydration, feeding the dehydrated coal into a 3# clean coal transferring belt, transferring the coal to a belt and conveying the belt to a product bin, and finally obtaining the 3# clean coal with ash content of 11-12%, the medium coal with calorific value of 4500 calories/gram.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (1)
1. A coal dressing process for on-line recovery of high-ash clean coal from middlings is characterized by comprising the following steps:
the first step is as follows: heavy-medium coal separation system with built pressure two-product cyclone and pressure three-product cyclone
The heavy medium coal separation system has the structure that: replacing a second-section cyclone of the two-section two-product heavy medium coal separation system with a pressure three-product cyclone, wherein the separation pressure is not lower than 0.25MPA, so as to establish a heavy medium coal separation system consisting of the pressure two-product cyclone and the pressure three-product cyclone;
the second step is that: the method comprises the following steps of (1) carrying out coal dressing by using the established dense medium coal dressing system:
(1) raw coal is classified by a classifying screen, enters a mixing barrel, is pumped into a pressurized two-product cyclone by a mixing pump for separation, the overflow of the cyclone is subjected to medium removal and dehydration and then is used as a low-ash clean coal product, and the underflow of the cyclone is subjected to simple medium removal and dehydration and then is used as a medium gangue mixture;
(2) the medium-gangue mixture enters a re-washing mixing barrel, a pressure three-product heavy medium cyclone is driven by a mixing pump to perform separation, the overflow of the cyclone enters a clean coal medium removal sieve for medium removal, the medium coal enters a medium coal medium removal sieve for medium removal, the gangue enters a gangue medium removal sieve for medium removal, the medium coal is dehydrated by a centrifuge and then enters a medium coal transfer belt, the clean coal is collected by a scraper conveyer and then enters a centrifuge for dehydration, and the clean coal enters a high-ash clean coal transfer belt after dehydration and is transported to a product bin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010233075.XA CN111437986A (en) | 2020-03-29 | 2020-03-29 | Coal dressing process for on-line recovery of high-ash clean coal from medium coal |
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| CN202010233075.XA CN111437986A (en) | 2020-03-29 | 2020-03-29 | Coal dressing process for on-line recovery of high-ash clean coal from medium coal |
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| CN111437986A true CN111437986A (en) | 2020-07-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112371323A (en) * | 2020-09-21 | 2021-02-19 | 新汶矿业集团有限责任公司洗煤分公司 | Combined separation process of pressurized two-product and pressurized three-product cyclones |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179288A (en) * | 2010-12-21 | 2011-09-14 | 王万明 | Coal-reselecting process for heavy media coal separation |
| CN202061696U (en) * | 2010-12-21 | 2011-12-07 | 王万明 | Middlings recleaning device by adopting dense medium coal cleaning |
| CN202555423U (en) * | 2012-05-17 | 2012-11-28 | 唐山国华科技国际工程有限公司 | Non-pressurized feeding two-stage two-product dense medium cyclone special for steam coal |
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2020
- 2020-03-29 CN CN202010233075.XA patent/CN111437986A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179288A (en) * | 2010-12-21 | 2011-09-14 | 王万明 | Coal-reselecting process for heavy media coal separation |
| CN202061696U (en) * | 2010-12-21 | 2011-12-07 | 王万明 | Middlings recleaning device by adopting dense medium coal cleaning |
| CN202555423U (en) * | 2012-05-17 | 2012-11-28 | 唐山国华科技国际工程有限公司 | Non-pressurized feeding two-stage two-product dense medium cyclone special for steam coal |
Non-Patent Citations (1)
| Title |
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| 曹辉: "中煤有压再选三段重介质旋流器结构参数优化研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112371323A (en) * | 2020-09-21 | 2021-02-19 | 新汶矿业集团有限责任公司洗煤分公司 | Combined separation process of pressurized two-product and pressurized three-product cyclones |
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