AU659236B2 - Production method of ash-removed high-concentration coal-water slurry - Google Patents
Production method of ash-removed high-concentration coal-water slurry Download PDFInfo
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- AU659236B2 AU659236B2 AU28471/92A AU2847192A AU659236B2 AU 659236 B2 AU659236 B2 AU 659236B2 AU 28471/92 A AU28471/92 A AU 28471/92A AU 2847192 A AU2847192 A AU 2847192A AU 659236 B2 AU659236 B2 AU 659236B2
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- coal
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- 239000002002 slurry Substances 0.000 title claims description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 51
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000003245 coal Substances 0.000 claims description 109
- 239000011362 coarse particle Substances 0.000 claims description 58
- 239000002245 particle Substances 0.000 claims description 52
- 238000005188 flotation Methods 0.000 claims description 28
- 239000010419 fine particle Substances 0.000 claims description 26
- 238000002360 preparation method Methods 0.000 claims description 19
- 238000003801 milling Methods 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000010298 pulverizing process Methods 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 8
- 239000010802 sludge Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 230000000052 comparative effect Effects 0.000 claims description 4
- 101000720079 Stichodactyla helianthus DELTA-stichotoxin-She4a Proteins 0.000 claims 1
- 101150093411 ZNF143 gene Proteins 0.000 claims 1
- 239000003250 coal slurry Substances 0.000 claims 1
- 238000000034 method Methods 0.000 description 19
- 239000002270 dispersing agent Substances 0.000 description 11
- 239000000047 product Substances 0.000 description 10
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000006260 foam Substances 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011802 pulverized particle Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
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Description
6592361pB
AUSTRALIA
Patents Act 1990 COMPLETE SPECIFICTION~ STANDARD PATENT St
C.
Applicant(s): JAPAN COM CO., LTD.
itt C, (CC C C C St C S SSt*t C Invention Title: PRODUCTION METHOD OF ASH-REMOVED HIGH-CONCENTRATION COAL-WATER SLURRY The following statement is a full description of this invention, including the best method of performing it known to me/us:
SPECIFICATION
Title of the Invention Production Method of Ash-Removed High-Concentration Coal- Water Slurry Field of the Invention This invention relates to a production method of a high-concentration coal-water slurry comprising pulverized ^coal dispersed in water with a dispersant, more a° specifically, to a production method of a low-ash, highconcentration coal-water slurry including an ash-removing process.
Description of the Prior Art Heretofore, with the aim of facilitating transportation, storage, and handling of coal, pulverized I coal has been dispersed in water to produce a coal-water slurry. The coal-water slurry is required to have a high concentration to enhance the combustion efficiency, and to I have a low viscosity to facilitate transportation and handling.
In general, coal contains incombustible constituents (ash). The ash tends to damage the combustion nozzle and walls of the boiler during combustion, and involves problems in disposal after combustion. To solve such problems, there have been developed production processes for a coal-water slurry incorporating an ash-removing process. For example, there have been known a method in which raw material coal is divided into low-ash coal and medium-ash coal, and the medium-ash coal is pulverized to produce a coal-water slurry, which is then subjected to flotation to obtain an ash-removed slurry, whereas the low-ash coal is pulverized a and mixed with the ash-removed slurry to produce an ashremoved high-concentration coal-water slurry (Japanese 0 0 Patent Laid-open Publication 59-215391/1984), and a method in which high-density coal is removed from coarse crushed raw material coal, only the remaining low-density coal is converted into a coal-water slurry which is ash-removed by flotation, and then kneaded in the presence of a dispersant to produce a high-concentration coal-water slurry (Japanese Patent Laid-open Publication 60-203697/1985).
I With these prior art methods, it is possible to obtain an ash-removed coal-water slurry, however, it is difficult to obtain a high-concentration slurry, and the resulting i slurry is insufficient in stability. Furthermore, these prior art methods require use of a dewatering machine consuming a large amount of power, thus involve complex processes, and are low in efficiency.
2 1_ Object of the Invention With a view to eliminate such prior art problems, it is a primary object of the present invention to provide an efficient, stable production method of an ash-removed highconcentration coal-water slurry having a good stability.
Summary of the Invention The inventors have conducted intensive studies on the reasons that the above prior art methods are difficult to f obtain high-concentration coal-water slurry having a high stability, and found the following. Since ash content of pulverized coal particles increases as the size of the coal particles becomes smaller, a greater amount of small-sized coal particles are removed during the ash removal by flotation. Furthermore, ultra-fine coal particles decrease in recovery rate during flotation, increasing the amount of flowing loss. Moreover, when a dewatering machine is provided after flotation, finer coal particles tend to have increased rate of flowing loss. Therefore, the resulting coal-water slurry is insufficient in the content of fine particles to form a close-packed condition, is difficult to obtain a high concentration, and inferior in dispersibility and stability.
Furthermore, since the processing amount ratio of jig cleaning or dense medium cyclone preparation and flotation f S-3- 1 s I 1 depends upon the preparation condition and the ash content, in the above-proposed, prior art methods in which two types of clean coal obtained by the above two methods are put into a single mill, the particle size distribution of the coalwater slurry product at the mill outlet tends to vary because the particle size distribution of the raw material at the mill inlet varies. The inventors have found that when the particle size of the product varies, due to the *properties specific to coal-water slurry, the concentration tends to fluctuate and it is difficult to obtain a product having a desired constant concentration.
The inventors have further found that when the portion obtained by jig cleaning or dense medium cyclone preparation is supplied, as is, to a pulverizer, but the froth portion from flotation is once milled by a tower mill and then t supplied to the pulverizer, the portion of fine particles can be supplemented and the particle size distribution of coal supplied to the pulverizer can be made constant even when the coal preparation condition and the ash content of run-of-mine coal vary, thus achieving the present invention.
In accordance with the present invention, there.is provided a production method of an ash remtoe highconcentration coal-water slurry comprising the steps of: crushing run-of-mine coal; classifying the crushed run-of-mine coal into a ;y 4 I ,Q I V4o W:ILY /w coarse particle coal having a particle diameter of 0.5 mm or more and a fine particle coal having a particle diameter of less than about 0.5 mm; subjecting the coarse particle coal obtained in the classification step to jig cleaning or dense medium cyclone preparation for separating the coarse particle coal into a low-ash coarse particle coal and a high-ash coarse particle coal; pulverizing the high-ash coarse particle coal obtained in the separation step to fine coal particles having a particle diameter of about 0.5 mm or less, combining with the fine particle coal obtained in the separation step and subjecting to flotation for separating into froth and sink sludge; concentrating the froth from the flotation and milling the concentrated froth by a tower mill to obtain a finely pulverized slurry; and i pulverizing the low-ash coarse coal obtained in the separation step and the finely pulverized slurry obtained in the milling step in a pulverizer to obtain a high-concentration coal-water slurry.
The present invention will now be described in detail with reference to a process flow chart in Fig.l showing an embodiment of the present invention.
Run-of-mine coal is first crushed by a crusher into i 5 a particle diameter of 50 mm or less, preferably 30 mm or less.
The crushed run-of-mine coal is classified by a classifier. The fraction passed through the sieve preferably has a particle diameter of about 0.5 mm in view of the subsequent flotation step. That is, the crushed run-of-mine coal is classified by the classification step into the coarse particle coal having a particle diameter of K i about 0.5 mm or more and the fine particle coal having particle diameter of less than about 0.5 mm.
St, The coarse particle coal having a particle diameter of about 0.5 mm or more separated by the classification is subjected to jig cleaning or dense medium cyclone preparation. The coarse particle coal is divided into a low-ash coarse particle coal (coarse particle clean coal) and a high-ash coarse particle coal (coarse particle sink).
The principle of the preparation is to divide the coarse particle coal into the coarse particle clean coal having a low density and a coarse particle sink having a high density utilizing a difference in density due to a difference in the ash content. The jig cleaning or the dense medium cyclone preparation is simple in operation and low in cost compared to the flotation. Thus, it is one of the specific features of the present invention that the classification step and the jig cleaning or dense medium cyclone preparation step I1 1L S I .7 4i t
,I
t 444 t 4C~ .4( are used, and only part of the run-of-mine coal is subjected to the complex flotation step.
The coarse particle clean coal is supplied, as is, to a pulverizer to form a coal-water slurry. Separately, the high-ash coarse particle sink is pulverized by a coarse pulverizer to a particle size suitable for flotation, that is, a particle diameter of about 0.5 mm or less. The pulverized coarse particle sink is combined with the fine particle coal having h particle diameter of about 0.5 mm or less from the classification step, and is subjected to the flotation method. The flotation method can be a conventional one known in the art. For example, a collector and a frother are mixed, and foam is generated mechanically or by air injection causing coal to attach to the foam, which is collected. By the flotation method, low-ash coal fine particles are recovered as froth, and so-called sink sludge of high ash content is separated and discarded, or reused as a raw material of another low-grade coal-water slurry.
The froth collected here is concentrated in view of a concentration required for milling by the tower mill and for supplying to the pulverizer. It is preferable to concentrate the froth by a thickener, because this method does not require large power. The concentrated low-ash coal fine particles are milled by the tower mill into fine 7 it r pulverized particles and supplied to the pulverizer. In the treatment by the tower mill, it is preferable to add a dispersant.
In the present invention, since fine coal particles are formed by the milling in the tower mill, amounts of fine particles lost during the flotation and concentration steps are supplemented, thereby enabling a close-packed condition of particles and obtaining a stable high-concentration coal-water slurry. Furthermore, since, even if the preparation ratio, preparation condition, and the ash content of coal in the jig cleaning, dense medium cyclone preparation, or flotation step fluctuate to some extent, the particle size at the outlet of the tower mill can be controlled by adjusting the treatment conditions (rotation speed, ball amount, and passing concentration) of the tower mill, thereby making constant the particle size distribution of fine particles supplied to the pulverizer. That is, quality of the product can be made constant independent of variations in operation condition.
The low-ash coarse particle clean coal obtained in the separation step and the low-ash coal fine particles obtained by milling in the tower mill of step above are supplied to the pulverizer and pulverized. During the pulverization, water and a dispersant may be mixed as !i needed. A coal-water slurry is formed by the pulverization.
8
I:
The resulting coal-water slurry is an ash-removed, low-ash product, and has a high concentration and a low viscosity, with improved stability.
As described above, since, in the present invention, the low-ash coarse particle clean coal and the low-ash fine particles obtained by milling in the tower mill are supplied to the pulverizer and converted into a slurry, by adjusting the ratio of the coarse particle clean coal and the fine I u, particles, the slurry particles at the pulverizer outlet can be controlled to be suitable for close-packed condition, and a high-concentration, low-viscosity, stable coal-water slurry can be efficiently obtained. Furthermore, this process is simple and efficient since it does not require a J" dewatering step.
Brief Description of the Drawing Fig.l is a process flow chart showing an example the present invention.
Description of Preferred Embodiments Example 1 1,000 kg (hereinafter based on dry coal) of run-of-mine coal having an ash content of 9% was crushed by a roll crusher. The crushed product was classified by a vibrating sieve with a mesh size of 0.5 mm. As a result, the crushed -9 I /0 product was divided into 866 kg of coarse particle coal having a particle diameter of 0.5 mm or more and 134 kg of fine particle coal having a particle diameter of less than mm. The coarse particle coal had an ash content of and the fine particle coal had an ash content of 18.7% The coarse particle coal was prepared by dense medium cyclone preparation to obtain 693 kg of coarse particle clean coal as a low-density fraction having an ash content Jof 4.2% and 173 kg of coarse particle sink as a high-density f fraction having an ash content of 20.7%. The low-ash coarse particle clean coal was supplied, as was, to a pulverizer.
The high-ash coarse particle sink was further roughly pulverized by a ball mill to a particle diameter of 0.5 mm or less. The roughly-pulverized coarse particle sink and the fine particle coal obtained by the above classification were mixed, and the mixture (307 kg, ash content: 19.8%) was treated by flotation. By the flotation, the mixture was separated to 230 kg of froth (ash content: 10.0%) and 77 kg of preparation sludge (ash content: 49.2%).
The froth was allowed to stand, the supernatant layer was removed and concentrated to a concentration of 50% by weight. The concentrated product was mixed with a dispersant and milled by a tower mill (brandname: TOWER MILL) to yield a finely pulverized slurry (228 kg, ash content: having an average particle diameter .of 7.2#gm.
10 693 kg of the above coarse particle clean coal, 228 kg of the finely pulverized slurry, and 161 kg of water were put into a pulverizer with a dispersant, and pulverized into a slurry. As a result, 1,395 kg of a coal-water slurry having an ash content of coal of a concentration of 66.0%, a viscosity of 530 cp, an average particle diameter of 17/m, and a weight ratio of particle diameter of 1m or less of 7.0% was obtained. A concentration of this coalo water slurry corresponding to 1,000 cp was 67.7%.
Comparative Example 1 After the froth from flotation in Example 1 was allowed to stand and concentrated to 50% by weight, without I, subjecting to a tower mill, the concentrated froth was mixed, as was, with 693 kg of the coarse particle clean coal, 161 kg of water, and a dispersant, and pulverized by a pulverizer to an average particle diameter of 17gm. The resulting coal-water slurry had a concentration of 66.0%, a viscosity of 1,756 cp, a concentration corresponding to 1,000 cp of 65.0%, and was inferior in properties compared to the coal-water slurry obtained in Example 1. The weight ratio of particle diameter of 1im or less was 5.8%.
Comparative Example 2 After the froth from flotation in Example 1 was 'allowed ii SI h 1 to stand and concentrated to 50% by weight, without subjecting to a tower mill, the concentrated froth was mixed with 693 kg of the coarse particle clean coal, 161 kg of water, and a dispersant, and pulverized by a pulverizer to a weight ratio of particle diameter of glm or less of The resulting coal-water slurry had a concentration of 66.0%, a viscosity of 1,088 cp, a concentration corresponding to 1,000 cp of 65.8%, and was inferior in properties compared to the coal-water slurry obtained in Example 1. The coal-water slurry had an average particle diameter of 14/m.
Example 2 1,000 kg (hereinafter based on dry coal) of run-of-mine coal having an ash content of 13.6% and a water content of gi g 9.1% was crushed by a roll crusher. The crushed product was classified by a vibrating sieve with a mesh size of 0.5 mm into 815 kg of coarse particle coal having a particle diameter of 0.5 mm or more and 185 kg of fine particle coal having a particle diameter of less than 0.5 mm. The coarse particle coal had an ash content of 12.6% and the fine particle coal had an ash content of 18.0%.
The coarse particle coal was treated by jig preparation to obtain 554 kg of coarse particle clean coal as a lowdensity fraction having an ash content of 7.5% and 261 kg of 12 I 3 coarse particle sink as a high-density fraction having an ash content of 23.5%. The low-ash coarse particle clean coal was supplied, as was, to a pulverizer. The high-ash coarse particle sink was further roughly pulverized by a ball mill to a particle diameter of 0.5 mm or less. The rough-pulverized coarse particle sink and the fine particle coal obtained by the above classification were mixed, and the mixture (446 kg, ash content: 21.2%) was treated by flotation. By the flotation, the mixture was separated to 280 kg of froth (ash content: and 166 kg of preparation sludge (ash content: 41.4%).
The froth was allowed to stand, the supernatant layer was removed and concentrated to a concentration of 50% by weight. The concentrated product was mixed with a dispersant and milled by a tower mill (brandname: TOWER MILL) to yield a finely pulverized slurry (278 kg, ash content: having an average particle diameter of 7.2g m.
554 kg of the above coarse particle clean coal, 278 kg of the finely pulverized slurry, 40 kg of water and a dispersant were put into a pulverizer, and pulverized into a slurry. As a result, 1,184 kg of a coal-water slurry having an ash content of coal of a concentration of 68.0%, a viscosity of 958 cp, an average particle diameter of 14.6gm, and a weight ratio of particle diameter of 1,am or it i~4 13 less of 7.9% was obtained.
Comparative Example 3 After the froth from flotation in Example 2 was allowed to stand and concentrated to 50% by weight, without subjecting to a tower mill, the concentrated froth was mixed, as was, with 554 kg of the coarse particle clean coal, 77 kg of water, and a dispersant, and pulverized under the same condition as in Example 2. The resulting coalwater slurry had a concentration of 66.0%, a viscosity of 1,171 cp, and so was low in concentration and high in viscosity compared to the coal-water slurry obtained in Example 2.
lEr With the present invention, since part of coal particles cleaned for ash-removing is milled by a tower mill, and then pulverized with coarse particle coal to form a coal-water slurry, the ratio of the coarse particle coal
C'
and the fine particles can be adjusted to be suitable for close-packed condition, and a stable, high-concentration coal-water slurry with consistent quality can be produced by a simple, stable, and efficient process, because the particle size can be adjusted in the milling by a tower mill even if the particle size of the fine particles varies due to variations in preparation condition and the like.
14
Claims (3)
1. A production method of a low ash high- concentration coal-water slurry comprising the steps of: crushing run-of-mine coal; classifying the crushed run-of-mine coal into a coarse particle coal having a particle diameter of mm or more and a fine particle coal having a particle diameter of less than 0.5 mm; subjecting the coarse particle coal obtained in the classification step to jib cleaning or dense medium cyclone preparation for separating the coarse particle coal into a low-ash coarse particle coal and a high-ash coarse particle coal; pulverizing the high-ash coarse particle coal obtained in the separation step to fine coal particles having a particle diameter of 0.5 mm or less, combining with the fine particle coal obtained in the separation step and subjecting the mixtures to flotation for separating into froth and sink sludge; 20 concentrating the froth from the flotation step and milling the concentrated froth by a tower i mill to obtain a finely pulverized slurry; and pulverizing the low-ash coarse coal obtained in the separation step and the finely 25 pulverized slurry obtained in the milling step in a I slurry. l
2. A production method of a low ash high- concentration coal-water slurry substantially as herein t*tt 30 before described with reference to the accompanying drawing. statahleokeepI28471.92.speci'.rc 20.2 W' p- x 4 v^ -16
3. A production method of a low ash high- concentration coal-water slurry substantially as herein before described with reference to any one of the foregoing examples apart from the comparative examples. DATED THIS 20TH DAY OF FEBRUARY 1.995 JAPAN COM CO LTD By its Patent Attorneys: GRIFFITH HACK CO Fellows Institute of Patent Attorneys of Australia 0t* *4Ss I *1 I I~ 'I C C I It CS C C St I St tt 1'~ 7 staf~ahleet~keep/2S471.92.speci~jmS 20.2 Abstract A production method of a high-concentration coal-water slurry includes a step for classifying crushed run-of- mine coal into coarse particle coal and fine particle coal, a step for subjecting the coarse particle coal to jig cleaning or dense medium cyclone preparation to separate the coarse particle coal to a low-ash coarse particle clean coal and a high-ash coarse particle sink, a step for pulverizing the coarse particle sink into fine coal particles, and subjecting the fine coal particles with the fine particle coal of step to flotation for separation into froth and sink sludge, a step for concentrating the froth and milling by a tower mill into a fine particle coal 944* slurry, and a step for pulverizing the coarse particle i clean coal and the fine particle coal slurry in a pulverizer into a coal-water slirry, whereby a constant-quality, stable, ash-removed high-concentration coal-water slurry can be produced simply ahd efficiently. I
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34590291A JPH0711268A (en) | 1991-12-27 | 1991-12-27 | Production of deashed high-concentration coal-water slurry |
| JP3-345902 | 1991-12-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2847192A AU2847192A (en) | 1993-07-01 |
| AU659236B2 true AU659236B2 (en) | 1995-05-11 |
Family
ID=18379771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU28471/92A Ceased AU659236B2 (en) | 1991-12-27 | 1992-11-19 | Production method of ash-removed high-concentration coal-water slurry |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH0711268A (en) |
| CN (1) | CN1073757A (en) |
| AU (1) | AU659236B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106669961A (en) * | 2016-06-20 | 2017-05-17 | 中国矿业大学 | Process for recycling fine coal from middlings |
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| CN100547299C (en) * | 2003-07-31 | 2009-10-07 | 北京光慧晓明声能技术研究所 | Hydrodynamic sonic energy coal-water slurry preparation system |
| CN100432534C (en) * | 2006-10-27 | 2008-11-12 | 佛山市南海洁能燃料有限公司 | Cleaning technology of coarse particles on grinder outlet in water coal slurry manufacturing technology |
| CN101144042B (en) * | 2007-10-19 | 2013-04-10 | 张绍龙 | Technique for procuring desulfurization type water-solubility instant coal powder |
| CN101245918B (en) * | 2008-03-21 | 2010-07-21 | 广州大华德盛科技有限公司 | A new pulping method of ultra-fine coal-water slurry |
| CN101368734B (en) * | 2008-09-23 | 2010-10-13 | 贵州大学 | Desulfurizing recycle method for high sulfur medium-tail coal |
| CN101362966B (en) | 2008-10-14 | 2011-07-06 | 西北化工研究院 | A preparation method of multi-component slurry for producing syngas and multi-component slurry obtained by said method |
| CN101559404B (en) * | 2009-06-05 | 2013-04-17 | 唐山国华科技国际工程有限公司 | Middlings crushing and sorting technique |
| CN101956992B (en) * | 2010-09-06 | 2011-09-21 | 江苏秋林重工股份有限公司 | Low rank coal fuel coal water slurry and gasified coal water slurry complete production unit |
| CN102847606A (en) * | 2012-09-01 | 2013-01-02 | 山东科技大学 | Coarse slime separation process |
| CN103206718B (en) * | 2013-04-09 | 2015-04-15 | 陕煤集团神木张家峁矿业有限公司 | System and method for improving slurry property of low order coal slurry |
| US20160082446A1 (en) | 2014-09-24 | 2016-03-24 | Omnis Mineral Technologies, Llc | Flotation separation of fine coal particles from ash-forming particles |
| CN105642431B (en) * | 2014-10-13 | 2020-07-28 | 重庆永润新材料有限公司 | Method for gravity separation of sulfur concentrate from sulfur-containing coal gangue |
| CN105419891B (en) * | 2015-12-29 | 2018-06-29 | 江西省科学院能源研究所 | A kind of preparation method of the low grey environment protecting coal-water fluid of energy-saving low-sulfur |
| CN105950238A (en) * | 2016-07-18 | 2016-09-21 | 中国矿业大学(北京) | System for preparing coal water slurry |
| CN107727543B (en) * | 2017-10-17 | 2020-06-05 | 佛山市南海港能燃料物料有限公司 | Coal water slurry slurrying test method |
| CN109718944B (en) * | 2019-03-08 | 2019-11-29 | 中国矿业大学 | A kind of aqueous medium underground coal preparation technique |
| CN110479479B (en) * | 2019-07-18 | 2023-03-17 | 太原理工大学 | Technological method for macro separation of microconstituent concentrate from raw material coal |
| CN113262874B (en) * | 2021-05-12 | 2022-02-08 | 乌海市广源洗煤有限责任公司 | Coal re-extraction process in coking coal |
| CN115851330A (en) * | 2022-12-23 | 2023-03-28 | 国能神东煤炭集团有限责任公司 | Preparation method of gasified coal water slurry |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU1351583A (en) * | 1983-04-14 | 1984-10-18 | Electric Power Development Co. Ltd. | Preparing high solid concentration coal-water slurry |
| EP0183479A2 (en) * | 1984-11-20 | 1986-06-04 | Electric Power Development Co., Ltd | Preparation of deashed high solid concentration coal-water slurry |
| AU8787991A (en) * | 1990-12-21 | 1992-06-25 | Japan Com Co., Ltd. | Production method of high-concentration coal-water slurry |
-
1991
- 1991-12-27 JP JP34590291A patent/JPH0711268A/en active Pending
-
1992
- 1992-11-19 AU AU28471/92A patent/AU659236B2/en not_active Ceased
- 1992-12-24 CN CN 92114845 patent/CN1073757A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU1351583A (en) * | 1983-04-14 | 1984-10-18 | Electric Power Development Co. Ltd. | Preparing high solid concentration coal-water slurry |
| EP0183479A2 (en) * | 1984-11-20 | 1986-06-04 | Electric Power Development Co., Ltd | Preparation of deashed high solid concentration coal-water slurry |
| AU8787991A (en) * | 1990-12-21 | 1992-06-25 | Japan Com Co., Ltd. | Production method of high-concentration coal-water slurry |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106669961A (en) * | 2016-06-20 | 2017-05-17 | 中国矿业大学 | Process for recycling fine coal from middlings |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1073757A (en) | 1993-06-30 |
| JPH0711268A (en) | 1995-01-13 |
| AU2847192A (en) | 1993-07-01 |
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