AU656209B2 - Production method of high-concentration coal-water slurry from coal preparation sludge - Google Patents
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- AU656209B2 AU656209B2 AU20996/92A AU2099692A AU656209B2 AU 656209 B2 AU656209 B2 AU 656209B2 AU 20996/92 A AU20996/92 A AU 20996/92A AU 2099692 A AU2099692 A AU 2099692A AU 656209 B2 AU656209 B2 AU 656209B2
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- 239000003245 coal Substances 0.000 title claims description 127
- 239000002002 slurry Substances 0.000 title claims description 91
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 89
- 238000002360 preparation method Methods 0.000 title claims description 61
- 239000010802 sludge Substances 0.000 title claims description 51
- 238000004519 manufacturing process Methods 0.000 title claims description 20
- 238000000034 method Methods 0.000 claims description 24
- 239000002270 dispersing agent Substances 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 16
- 238000010298 pulverizing process Methods 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 13
- 238000005243 fluidization Methods 0.000 claims description 5
- 239000003945 anionic surfactant Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000002736 nonionic surfactant Substances 0.000 claims 1
- 239000000047 product Substances 0.000 description 16
- 239000011362 coarse particle Substances 0.000 description 8
- 239000002994 raw material Substances 0.000 description 7
- 238000010790 dilution Methods 0.000 description 6
- 239000012895 dilution Substances 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 241000196324 Embryophyta Species 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 239000012467 final product Substances 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000004062 sedimentation Methods 0.000 description 4
- 239000004094 surface-active agent Substances 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000537371 Fraxinus caroliniana Species 0.000 description 1
- 235000010891 Ptelea trifoliata Nutrition 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011899 heat drying method Methods 0.000 description 1
- 239000001023 inorganic pigment Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
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- Liquid Carbonaceous Fuels (AREA)
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Description
r 656209 AUSTRAL IA* Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT Applicant(s): JAPAN CON CO., LTD.
O Invention Title: PRODUCTION METHOD OF HIGH-CONCZNTRATION COAL-WATER C' SLURRY FROM COAL PREPARATION SLUDGE.
The following stzatement is a full description of this invention, including the best method of performing it known to me/us:
IF)°
SPECIFICATION
Title of the Invention Production ::ethod of High-Concentration Coal-Water Slurry from Coal Preparation Sludge Field of the Invention This invention relates to a production method of a high-concentration coal-water slurry from low-grade coal, that is, high water-content, high ash-content fine coal particles, released from a coal preparation plant.
0oo a 0c Description of the Prior Art In coal mines, run-of-mine coal is subjected to adjustment of ash content and removal of foreign substances 0 9 at a coal preparation plant to obtain high-grade clean coal 00 which is shipped. At the coal preparation plant, high ash- 0. content, low-grade coal is released in association with this coal preparation. Depending on the coal preparation method, such low-grade coal includes coarse particles ot high water-content fine porticles or the like. Currently, of the low-grade coal, fine coal particles which have high water and ash contents (hereinafter referred to as "coal preparation sludge") are thrown away into a pit near the coal preparat 4 n plant, and allowed to stand as is.
Recently, however, this has become a problem in view of effective utilization of resources and environmental pollution.
Furthermore, coal has recently been reconsidered as an energy source, but coal is solid and thus hard to handle in transportation and storage. To overcome such disadvantages of coal, a coal-water slurry (CWM) te'chnology is being developed, in which coal is pulverized and dispersed in water with a small amount of dispersant, which can be han dled as a liquid.
S0 If the coal-water slurry technology can be applied to the above coal preparation sludge to use it as a fluidized 9999 fuel, the sludge will be transported by a puwp, and can be used, as is, as a fuel for power plants, leading to effective utilization of unused resources and eliminating environmental pollution problems.
Prior art production methods of coal-water slurry are broadly divided into a dry process and a wet process. In the dry process, coal is pulverized, as is, then mixed with water and kneaded to obtain a high-concentration coal-water 9 9 slurry. As the wet process, there have been known a lowconcentration pulverization method, in which coal and water are pulverized at a low concentration and then dewatered to obtain a high-concentration coal-water slurry, and a high concentration pulverization method, in which coal is 2kI~7 N o C *000 0 0 0 00 0 0 C~ 0*00 4 00 0*0* 0 00 0004 pulverized at a high concentration to obtain a highconcentration coal-water slurry. However, when coal preparation sludge is used as a raw material, since the sludge comprises fine coal particles with high contents of water and ash, it is difficult to produce a coal-water slurry by a conventional production method of coal-water slurry which uses ordinary coal as a raw material.
Specifically, production of a coal-water slurry from high water content coal preparation sludge by the dry process requires drying of the coal preparation sludge, which requires large amounts of heat energy, disadvantageous in view of economy, and involves a problem of surface oxidation of coal during drying, resulting in coal-water slurry products with deteriorated quality. In -the lowconcentration pulverization method of wet process, dewatering tends to be insufficient due -to -the effect of fine ash particles contained in -the coal preparation sludge, and a high concentration of 'the coal-water Slurry cannot be achieved. Furthermore, coal preparation sludge comprises fine particles with a high water content, it is difficult -to handle, and when -the above coal-water slurry production method is applied, as is, a predetermined amount of cannot be continuously supplied uniformly to the pulverizer in the continuous production, and it is impossible -to produce a homogeneous coal-water slurry smoothly and efficiently.
j -3 a stable production method of a high-concentration, highquality coal-water slurry from coal preparation sludge.
Summary of the Invention The inventors have conducted intensive studies to solve the above problems in the production of a coal-water slurry from coal preparation sludge and, as a result, it has been found that a coal-water slurry can be stably produced by mixing the coal preparation sludge with a dispersant, and water for dilution as needed, under stirring to fluidise the mixture, and supplying it to a high-concentration pulveriser.
.o o 0 o..r Thus, according to the present invention there is provided 15 a method of producing a high-concentration coal-water a b slurry from fine coal particles having a high water content o 0 and a high ash content discarded from a coal preparation plant during coal preparation, comprising adding a dispersing agent to said fine coal particles to form a 20 mixture, stirring the mixture to fluidise the mixture, and oo0 feeding the mixture to a pulveriser for pulverisation to o form the high-concentration coal-vater slurry.
*0000 *0 The production method accordi-Q to the present invention will now be described in detail with reference to the S00.
25 diagrams. Fig. 1 is a block diagram showing an example of the coal-water slurry production apparatus according to stafrindleep/pat20996 9 2 8.11 r -the present invention. Coal preparation sludge S, with a dispersant D, is put into a mixer 1. The coal preparation sludge S is mixed by stirring in the mixer 1 for a predetermined time to be fluid ized.
When a coal-water slurry is produced from coal preparation sludge alone, concentration of the coal sludge at mixing is to be higher -than the final concentration of the coal-water Slurry. When -the coal preparation sludge is low in water content and is -thus difficu~lt to be fluidized, dilution water W may be added to reduce -the viscosity 00 P considering the coal concentration of -the high-concentration P 0coal-wiat Slurry as the final product When the sludge is high in viscosity and is -thus difficult -to be fluidized, part of -the coal-water Slurry as the final product may be returned to -the mixer 1 and the above procedure be repeated to obtain a low-viscosity coal-water slurry. The amount of the coal-water slurry final product is preferably equal to as' o or less -than the amount of 'the coal preparation sludge put %o00 in-to -the mixer.
The coal preparation Sludge, fluidized by stirring, is transferred to a slurry feed tank 3. A classification screen 2 may be disposed between -the mixer 1 and the slurry feed -tank 3 to remove foreign materials and the like. It is preferably that the slurry feed 'tank 3 is provided with a stirrer to .prevent sedimentation of coal particles. The fluidized coal preparation Sludge is then fed through a line from the Slurry feed 3 to a pulverizer 6, where wet pulverization is carried ouit -to a desired particle size. It is preferable 'to use a line 4 for self -recirculation -to prevent sedimentation of coal particles when the supply from the slurry feed tank 3 is temporarily discontinued.
The coal-water slurry, obtained by wet pulverization in the pulverizer 6, is fed to a st-rainer 7 where the slurry is screened, coarse particles are returned through a coarse particle return line 8 to -the pulverizer, and fine particle slurry is sent -through a product line 9 -to a product tank 0 where -the product is stored. In order to reduce the o ooviscosity to facilitate storage anid -transportation, it is preferable to provide an agitator to apply a shearing force -to the coal-water slurry and the slurry is agitated to 0D 00* obtain the product. Numeral 12 indicates a product return line, showing a process 'to add part of the product -to the coal preparation Slu~dge to fluidize.
0) 0 coal preparation Sludge, which is high in wate otn n ash content, comprises fine particles, and is thus very difficult -to handle, is added a dispersant, mixed by stirring, and fed 'to the Pulverizer, it is always possible -to continuously supply the pulverizer with a constant amount of -the sludge, -thereby smoothly and efficiently producing a -6 S-7 coal-water slurry of consistent quality.
Depending on the application, the coal-water slurry is required to have a high calorific value, for example, for use as a power plant fuel. Coal preparation slurry has been stored over a long period of time and, depending on the releasing location, includes various types such as those which contain higher amounts of water than that of the coal-water slurry and those which have not a required calorific value due to a high ash content. In the present invention, it is possible to add run-of-mine coal in the oo fluidization and/or pulverization step of the coal preparation sludge, thereby producing a coal-water slurry ro with improved quality from the coal preparation sludge.
0 0 Furthermore, storage stability can also be improved by adding run-of-mine coal.
Fig.2 is a block diagram of the case in which run-ofmine coal is added at the pulverization step. In the figure, numeral 11 indicates a run-of-mine coal hopper, and other numerals are the same as in Fig.l. Run-of-mine coal is continuously supplied at a constant rate from the hopper 11 to the pulverizer 6. By the supply of run-of-mine coal, a coal-water slurry of improved quality can be obtained.
SThe run-of-mine coal may be added to the mixer 1. With the method shown in Fig.2, since run-of-mine coal having a lower water content than the coal preparation sludge is supplied 7 coal is added, it is possible to adjust the ash content and i calorific value of the final product depending on the mixing I 1 by a separate system, concentration in the mixer 1 to obtain ratio, thereby easily obtainingjective coal-water slurry concenation ca be set toable for the purpose. Mixing ratio of the run-of-mine coal can be flexibly controlled but, in view of economy, it is a lower v alue by addin-of-mine coal in an amoun t equal to orates fluidizatihat of the coal preparation sludge. The run-ofmineWith the above method, sin-prodced coal or clean coalf coal is added, i is possible to adju the ash content andprocess.
calorific value of the present final product depending on the xingdispersant used fluidize the coai preparation sludge is preferably one which is usedtio, thereby easily production obtaining a coal-water slurry tabland/or one for the purpose. Mixing ratio of trganic pigments of paints or be flexibly controlled but, in view of economy, it is surfactants which are generally used, preferably anionic surfactants. Furthermore, the dispersant may be used in combination with an alkaline substance as a pH value radjusting agent. These surfactants cian added in an amount equal to or less than that of *the coal preparation sludge. The run-ofmine coal can be either as-produced coal or clean coal treated by the coal preparation process.
In the present invention, the dispersant used to Sfluidi the coaby wreparation sludight, preferably 0.2 to 1.5% by one which is used in the productioonents of the coal-water slurry a nd/or one 8 which is used for dispersing inorganic pigments of paints or the like. The dispersant can be nonionic or anionic 0 surfactants which are generally used, preferably anionic surfactants. Furthermore, the dispersant may be used in combination with an alkaline substance as a pH value LY. adjusting agent. These surfactants can added in an amount of 0.1 to 3.0% by weight, preferably 0.2 to 1.5% by weight, based on the solid components of the coal-water slurry final !i i ir product. If the amount of the dispersant is smaller than the above value, a high-concentration coal-water slurry cannot be obtained, or if the amount of the dispersant is greater than the above value, it will be disadvantageous in view of economy. In the present invention, the dispersant may cnly be added at the fluidization step of the coal preparation sludge, or part of the dispersant may be added at the pulverization step.
Brief ?escription of the Drawings 6 0 oFig.l is a block diagram showing an example of -the 000 0 ca-ae lrypouto paau codn t h Fig. I is a block diagrami showing anote example of the 00 coal-water slurry production apparatus according to the *600 6 present invention.
Fig. 2 is a block diagram showing another example of the coal-water slurry production apparatus according to the 0 0 present invention.
*0 0 In the figures, numeral 1 indicates a mixer, numeral 2 609. 0l
I
indicates a classifier, numeral 3 indicates a slurry feed tank, numeral 4 indicates a recirculation line, numeral indicates a production line, numeral 6 indicates a 6 pulverizer, numeral 7 indicates a strainer, numeral 8 indicates a coarse particle return line, numeral 9 indicates a product line, numeral 10, indicates a product tank, numeral 11 indicates a run-of-mine coal hopper, and numeral 12 indicates a product return ii..a -9i- fe 1 *O 40
>C)
Dctcription of Preferred Embodiments Prior to describing preferred embodiments of the present invention, measurement methods of the properties of coal-water slurry used in the embodiments will be described.
Measurement of coal concentration Coal concentration was measured by a heat drying method according to JIS M8812.
Measurement of viscosity Viscosity was measured by means of Harke double cylinder viscometer at a temperature of 25°C and a shear rate of 100S- 0 c Measurement of standing s Lability 0 0 0\ Coal-water slurry in an amount of 400g was charged in a 500-ml plastic vessel and allowed to stand in an air bath at 250C. 14 days after the beginning of standing, the coalwater slurry was poured out from the vessel, and the amount of the slurry remaining in the vessel was measured.
In Examples, coal preparation sludge and run-of-mine coal were used as raw mat'.rials. The run-of-min3 coal was 1 j crushed by a hammer crusher or the like into smaller than S0approximately 3mm in size before use.
1.
10 p.-
I
Table I Coal Analysis item Total water Calorific value(kcal/kg) Inherent water Ash Volatiles Fixed carbon Fuel ratio Coal preparation sludge A-I A-2 A-3 29.0 32.5 31.4 5560 5320 4790 3.8 2.9 3.1 28.8 33.2 39.9 24.8 22.9 20.6 42.6 41.0 36.4 1.72 1.79 1.77 Run-of-mine coal B-i 11.5 6930 3.9 12.4 33.6 50.1 1.49 o 00 4 0 o 40 00 0 0 0 0040 40 0 40 00 4 4 40 0 00 00 0 00 0 o 0 0000 00 4 0 0 0
UOOOQO
4 Examples 1-2 Coal preparation sludges and in Table 1 were used as raw materials to produce coal-water slurries by the production test process shown in Fig.l. Dilution water to obtain a desired concentration and a dispersant were charged into the mixer 1. Each coal preparation sludge was added and stirred for 10 minutes. The coal preparation sludge became a completely fluidized condition. The slurry of the fluidized coal preparation sludge was filtered through the classification screen 2 to remove foreign substances and stored in the slurry feed tank 3. In the slurry feed tank 3, stirring and recirculation by the line 4 were carried out to prevent sedimentation of coal particles and to homogenize. A ball mill used as the pulverizer 6.
11 When producing a coal-water slurry by wet pulverization, the line 5 was selected to feed coal preparation sludge in the slurry feed tank 3 to the pulverizer 6. At this moment, dilution water was added to obtain a target concentration of the product. In the pulverizer 6, the ball amount and rotation speed were controlled to obtain a viscosity required for boiler combustion. In the pulverizer 6, stirring was also carried out along with pulverization to produce a low-viscosity coal-water slurry. The coal-water slurry was 'then fed to the strainer 7 where coarse particles were removed. The removed coarse particles were returned 0 through a line 8 to the inlet port of -the pulverizer 6 to be re-pulverized. The coarse particle-removed coal-water slurry was further stirred by a continuous shearing agitator. Properties of the thus obtained products are shown in Table 2, at the Examples 1-2 columns. A coal-water slurry with a low viscosity and good storage stability was produced from either raw material composition.
Q oExamples 8 Coal preparation sludges and and run-of-mine coal in Table 1 were used as raw materials in ratios as shown in Table 2 to produce coal-water slurries by the production I.st process shown in Fig.2. Dilution water to obtain a desired concentration and a dispersant 12- Scharged into -the mixer 1 and stirred. Each coal preparation sludge was added and stirred for 10 minutes, The coal preparation sludge became a completely fluicdized condition. The slurry of the fluidized coal preparation sludge was filtered -through the classification screen 2 -to rei.iove foreign subs tances and stored in -the slurry feed -tank 3. In the slurry feed -tank 3, stirring and recirculat ion by the line 4 were carried out to prevent sedimentation of coal particles and to homogenize. A ball mill used as the pulverizer 6. When producing a coal-water slurry by wet pulverization, -the line 5 was selected 'to feed coal preparation Sludge in the slurry feed -tank 3 to the pulverizer 6. Also, run-of-mine coal, crushed to smaller than 3 mm by a hammer crusher or the like was fed from 'the run-of-mine coal hopper 11 -through a constant amount coal feeder -to -the Pulverizer 6.
The coal preparation sludge slurry arid -the crushed run-of-mine coal were simultaneously fed -to -the Pulverizer 6. At -this moment, dilution water was added -to obtain a desired concentration of the product. In the pulverizer 6, -ithe ball amount and rotation speed were controlled to obtain a viscosity required for boiler combustion. In the pulverizer 6, stirring was also carried out along with pulverization to produce a low-viscosity coal-water slurry.
The coal-water slurry was then fed to -the strainer 7 where 13 coarse particles were removed. The removed coarse particles were returned through a line 8 to the inlet port, of the pulverizer 6 to be re-pulverized. The coarse particleremoved coal-water slurry was further kneaded by a continuous shearing agitator. Properties of the thus obtained products are shown in Table 2, at the Examples columns. It was found that a coal-water slurry with a low viscosity and good storage stability could be produced from any of the raw material compositions. Furthermore, it can be seen from comparison with Examples 1-2 that when high ash-content coal preparation sludges and are used, storage stability is also improved by the addition of run-of-mine coal.
Table 2 4) 0 0 Raw material Coal prepa- Run-of-i ration mine coal sludge Test apparatus Properties of product Coal Visco- Stability conc. sity (cp) Example I A-2 (100) Fig.l 61.1 1020 20.4 Example 2 A-3 (100) Fig.l 60.3 980 29.0 Example 3 A-i (67) B-l (33) Fig.2 66.8 770 8.7 Example 4 A-2 (67) B-I (33) Fig.2 65.9 880 10.8 Example 5 A-3 (50) B-i (50) Fig.2 66.0 900 9.2 The present invention has the following Coal preparation sludge is difficult to is high in water content and ash content and effects: handle since it comprises fine 14
J
particles, but in the present invention, coal preparation sludge can be subjected to pretreatment comprising addition of a dispersant and stirring to fluidize, and the result can be fed at a constant rate to the pulverizer, thereby producing a uniform coal-water slurry stably and continuously.
In the present invention, run-of-mine coal can be added in the production process of coal-water slurry from coal preparation sludge, thereby producing coal-water slurry of even higher calorific value and quality.
o< The present invention produces coal-water slurry, which *O can be used as a power station fuel, from coal preparation 000Q 0 6 sludge being discarded and allowed to stand, providing effective utilization of unused resources and solution of pollution problems.
1 1.5
Claims (9)
1. A method of producing a high-concentration coal- water slurry from fine coal particles having a high water content and a high ash content discarded from a coal preparation plant during coal preparation, comprising adding a dispersing agent to said fine coal particles to form a mixture, stirring the mixture to fluidise the mixture, and feeding the mixture to a pulveriser for pulverisation to form the high-concentration coal-water slurry.
2. The method of claim 1 further comprising adding a portion of the high-concentration coal-water slurry to the 9 mixture during the stirring for fluidisation of the mixture step.
3. The method of claim 1 or claim 2 further comprising adding run-of-mine coal to the mixture at the stirring and/or pulverisation step.
4. The method of any preceding claim in which the dispersing agent is a nonionic or anionic surfactant.
5. The method of any preceding claim in which the *09 dispersing agent is added in an amount of 0.1 to 3.0% by 4" weight based on the weight of the solid components of the coal-water slurry.
6. The method of claim 5 in which the dispersing agent is added in an amount of 0.2 to 1.5% by weight.
7. The method of any preceding claim in which the dispersing agent is added at or prior to the fluidisation step or a part of the dispersing agent is added at the 44\ statlfidi/keopaJ20996.92 8.11 ~7 i~1 i ct t n i I 17
8. The method of any preceding claim in which the high-concentration coal-water slurry has a coal concentration of 60% or more.
9. A method of producing a high-concentration coal- water slurry as hereinbefore described and with reference to the accompanying examples. A method of producing a high-concentration coal- water slurry as hereinbefore described and with reference to the accompanying drawings. oa a e a 00 0 0 0 o~o l 0 a o 0e 0o 0000 0 09 o a a *000 0 0 0 ao 0 00 o o0 6 o saDo 0 0000 *ro *t o Dated this 8th day of November, 1994 JAPAN COM CO., LTD. By Its Patent Attorney GRIFFITH HACK CO Fellows Institute of Patent Attorneys of Australia staWiriddkeep/pat/20996.92 8.11 ff~~ 1 Abstract of the Disclosure 00 o 00 0 t 0001 000 0 44 S06 6e o 0 1* *a o e a 1* a* 01 ft 0 0 4 A continuous and stable production method of a uniform, high-concentration coal-water slurry from coal preparation sludge released from a coal preparation plant, discarded, and allowed to stand, which is high in water content and ash content and includes fine coal particles, in which fine coal particles are mixed with a dispersant, stirred and mixed to fluidize, and fed to a pulverizer to be pulverized into a high-concentration coal-water slurry. Due to the fluidization, coal preparation sludge can be continuously fed at a constant rate to the pulverizer, thereby stably producing a product of consistent quality. i/ 'ii
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27046091A JPH0578676A (en) | 1991-09-24 | 1991-09-24 | Production of high-concentration coal-water slurry from coal dressing slurry |
| JP3-270460 | 1991-09-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2099692A AU2099692A (en) | 1993-03-25 |
| AU656209B2 true AU656209B2 (en) | 1995-01-27 |
Family
ID=17486607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU20996/92A Ceased AU656209B2 (en) | 1991-09-24 | 1992-08-13 | Production method of high-concentration coal-water slurry from coal preparation sludge |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH0578676A (en) |
| CN (1) | CN1071192A (en) |
| AU (1) | AU656209B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9096269B2 (en) | 2010-09-06 | 2015-08-04 | Toray Industries, Inc. | Structure for passenger vehicle interior, and manufacturing method therefor |
| CN102862826A (en) * | 2012-10-18 | 2013-01-09 | 中煤科工集团武汉设计研究院 | Ground coal supply device of long-distance pipeline coal slurry preparing system |
| CN105542901B (en) * | 2015-12-21 | 2017-11-28 | 神华集团有限责任公司 | A kind of method for reducing coal ash melting temperature |
| CN111389299A (en) * | 2020-04-23 | 2020-07-10 | 西安煤科动力科技有限公司 | Distributed pulping machine for filter-pressing coal slime |
| CN113249149A (en) * | 2021-05-24 | 2021-08-13 | 江苏秋林特能装备股份有限公司 | Process for preparing derivative biochar pulp from semi-coke wastewater organic concentrated solution |
| CN114350420B (en) * | 2022-01-17 | 2023-04-28 | 神华准格尔能源有限责任公司 | Preparation method and application of low-cost coal slime-based coal water slurry |
| CN114891544A (en) * | 2022-04-29 | 2022-08-12 | 天津博诺环保技术有限公司 | Treatment method for preparing sludge coal water slurry by two-stage modification of sludge |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU543002B2 (en) * | 1981-12-03 | 1985-03-28 | Electic Power Dev | High concentration coal-water slurry |
| AU562941B2 (en) * | 1984-11-20 | 1987-06-25 | Electric Power Development Co. Ltd. | 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
- 1991-09-24 JP JP27046091A patent/JPH0578676A/en active Pending
-
1992
- 1992-08-13 AU AU20996/92A patent/AU656209B2/en not_active Ceased
- 1992-09-07 CN CN 92110288 patent/CN1071192A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU543002B2 (en) * | 1981-12-03 | 1985-03-28 | Electic Power Dev | High concentration coal-water slurry |
| AU562941B2 (en) * | 1984-11-20 | 1987-06-25 | Electric Power Development Co. Ltd. | 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2099692A (en) | 1993-03-25 |
| CN1071192A (en) | 1993-04-21 |
| JPH0578676A (en) | 1993-03-30 |
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