CN108918230B - Preparation method of coal brick - Google Patents
Preparation method of coal brick Download PDFInfo
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- CN108918230B CN108918230B CN201810975789.0A CN201810975789A CN108918230B CN 108918230 B CN108918230 B CN 108918230B CN 201810975789 A CN201810975789 A CN 201810975789A CN 108918230 B CN108918230 B CN 108918230B
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- 239000003245 coal Substances 0.000 title claims abstract description 77
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 239000011449 brick Substances 0.000 title abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 55
- 238000000034 method Methods 0.000 claims abstract description 24
- 239000004484 Briquette Substances 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 14
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 239000003822 epoxy resin Substances 0.000 claims description 20
- 229920000647 polyepoxide Polymers 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 19
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 239000003292 glue Substances 0.000 claims description 16
- 238000007605 air drying Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims 1
- 239000000853 adhesive Substances 0.000 abstract description 5
- 230000001070 adhesive effect Effects 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000002310 reflectometry Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 239000012257 stirred material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2866—Grinding or homogeneising
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention relates to the technical field of coal quality detection, in particular to a preparation method of a coal brick. The preparation method at least comprises the following steps: pretreating a coal sample to obtain coal particles, and mixing the coal particles with a binder to obtain a premix; defoaming the premix, and standing to obtain the briquette, wherein the defoaming process comprises the following steps: a first stage: keeping the pressure of-20 to-30 KPa for 2-3min, and recovering to the standard atmospheric pressure; repeating the first step for 2-3 times; and (2) second stage: keeping the pressure of-40 to-50 KPa for 2 to 3min, and recovering to the standard atmospheric pressure; repeating the second step 2-3 times; and a third stage: keeping the pressure of-60 to-70 KPa for 2 to 3min, and recovering to the standard atmospheric pressure; repeating the third step for 2-3 times. According to the preparation method provided by the invention, the premix is subjected to defoaming under different negative pressure conditions, so that coal particles and the adhesive are gradually and fully contacted, and no bubbles exist in the briquette.
Description
Technical Field
The invention relates to the technical field of coal quality detection, in particular to a preparation method of a coal brick.
Background
In the coal quality detection method, the metamorphic grade of coal and the optimal index of mixed coal can be judged by specular group reflectivity measurement, microscopic coal rock component quantitative measurement, coke optical tissue measurement and coke pore structure measurement of coal, wherein the mass group reflectivity index is used for coal quality monitoring in coal trade by more and more coking enterprises, the index can be observed by manufacturing a pulverized coal polished section, and the pulverized coal polished section is required to be flat and smooth and has certain reflectivity and light transmittance, so that the observation is facilitated, and therefore, the flaking quality of the pulverized coal polished section is one of the prerequisites for obtaining reliable coal quality detection results. The preparation method of the coal rock analysis sample is newly established in China in 1997 (GB/T16773-1997), and the preparation method of the coal rock analysis sample is revised again in 2008 (GB/T16773-2008), but no more detailed step is provided, and only a rough step is provided. The preparation of the pulverized coal polished section comprises two procedures of preparation of the coal brick and polishing of the coal brick, but the existing preparation method of the coal brick is long in time consumption and low in efficiency, and air bubbles are easy to exist in the coal brick, so that the follow-up experimental observation is influenced.
Disclosure of Invention
Aiming at the problems that the existing method for manufacturing the coal bricks is long in time consumption and low in efficiency and bubbles exist in the coal bricks, the invention provides a method for manufacturing the coal bricks.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
a preparation method of a briquette, which at least comprises the following steps:
step a, pretreating a coal sample to obtain coal particles, and mixing the coal particles with a binder to obtain a premix;
b, defoaming the premix, and standing to obtain the briquette, wherein the defoaming process comprises the following steps:
a first stage: keeping the pressure of-20 to-30 KPa for 2-3min, and recovering to the standard atmospheric pressure;
repeating the first step for 2-3 times;
and a second stage: keeping the pressure of-40 to-50 KPa for 2 to 3min, and recovering to the standard atmospheric pressure;
repeating the second step 2-3 times;
and a third stage: keeping the pressure of-60 to-70 KPa for 2 to 3min, and recovering to the standard atmospheric pressure;
repeating the third step for 2-3 times.
Compared with the prior art, the preparation method of the briquette provided by the invention has the following advantages:
(1) the premix is subjected to defoaming under different negative pressure conditions, bubbles in a larger gap can be pumped away when the negative pressure is lower, the bubbles in the larger gap can be pumped away when the negative pressure is higher, different negative pressures can be provided by classification, coal particles can be gradually and fully contacted with the adhesive, no bubbles exist in the coal brick, and simultaneously, the situation that boiling or sputtering of the epoxy resin is easily caused because the larger negative pressure is always adopted is prevented;
if lower negative pressure is always adopted, small bubbles in the briquettes cannot be removed; if a large negative pressure is initially applied, boiling or sputtering of the epoxy resin is likely to occur. The technical effect of removing bubbles is achieved by adopting graded negative pressure to remove bubbles and taking various factors such as graded pressure, bubble removing time, repetition times and the like into consideration.
(2) The preparation method provided by the invention has the advantages of simple process, short time and high efficiency.
Specifically, preferably, the adhesive is a cold glue obtained by mixing epoxy resin and a curing agent.
Preferably, the cold glue is obtained by uniformly stirring the epoxy resin and the curing agent along the same direction until no thread exists.
The epoxy resin and the curing agent to be mixed have two forces in the stirring process, one is the force along the stirring direction, and the other is the lateral centrifugal force generated during stirring, and under the action of the two forces, the stirred material to be mixed is stretched out as much as possible along the stirring direction, so that the epoxy resin and the curing agent are more favorably and uniformly mixed.
Preferably, the curing agent is an epoxy resin curing agent.
Preferably, the mass ratio of the epoxy resin to the curing agent is 10: 3-5.
Preferably, the coal particles and the binder are stirred along the same direction according to the mass ratio of 1:5-6 until being uniformly mixed to obtain the premix.
The coal particles and the adhesive to be mixed have two forces in the stirring process, one is a force along the stirring direction, and the other is a lateral centrifugal force generated in the stirring process, and under the two forces, the stirred material to be mixed is stretched out as much as possible along the stirring direction, so that the coal particles and the adhesive are more favorably and uniformly mixed.
Preferably, the standing temperature is 20-25 ℃ and the time is 4-6 h.
Preferably, the standing temperature is 45-55 ℃ and the standing time is 1.5-2.5 h.
Preferably, the coal sample is naturally air-dried, crushed and sieved to obtain base coal particles with the particle size of less than or equal to 1mm, the base coal particles are air-dried, and the base coal particles are reduced and divided by a cone stacking quartering method to obtain the coal particles.
Preferably, the content of the base coal particles having a particle size of less than 0.1mm in the base coal particles is not more than 10 wt%.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a photograph of a briquette provided in example 1 of the present invention;
FIG. 2 is a photograph of a briquette provided by a comparative example.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following examples are provided to better illustrate the embodiments of the present invention.
Example 1
The embodiment of the invention provides a preparation method of a briquette, which comprises the following steps:
step a, taking 1Kg of coal sample, naturally drying, repeatedly crushing and sieving to obtain base coal particles with the particle size of less than or equal to 1mm, wherein the content of the coal-based particles with the particle size of less than 0.1mm is not more than 10 wt%. Weighing 100-200g of the air drying base coal particles with the granularity less than 1mm, and dividing the particles to 10-20g for later use by a cone stacking quartering method;
uniformly stirring the epoxy resin and the epoxy resin curing agent according to the mass ratio of 10:3 along one direction until no thread exists, and obtaining cold glue;
and (2) putting 1g of the standby coal particles and the cold glue into a mold according to the mass ratio of 1:5, slowly adding 5g of the cold glue, and stirring along one direction until the mixture is uniformly mixed to obtain the premix.
B, defoaming the premix by adopting a negative pressure defoaming technology, and standing to obtain the briquette:
a first stage: maintaining at-20 KPa for 2min, discharging gas, recovering to standard atmospheric pressure, and repeating the first step for 2 times;
and a second stage: maintaining at-40 KPa for 2min, discharging gas, recovering to standard atmospheric pressure, and repeating the second step for 3 times;
and a third stage: maintaining at-60 KPa for 2min, discharging gas, recovering to standard atmospheric pressure, and repeating the third step for 2 times;
and (4) after defoaming, standing for 5 hours in a fume hood at 25 ℃ to obtain the briquette.
The photo of the briquettes obtained above is shown in fig. 1, and it can be seen from the figure that the briquettes provided by the present invention are substantially free of bubbles.
Example 2
The embodiment of the invention provides a preparation method of a briquette, which comprises the following steps:
step a, taking 1Kg of coal sample, naturally drying, repeatedly crushing and sieving to obtain base coal particles with the particle size of less than or equal to 1mm, wherein the content of the coal-based particles with the particle size of less than 0.1mm is not more than 10 wt%. Weighing 100-200g of the air drying base coal particles with the granularity less than 1mm, and dividing the particles to 10-20g for later use by a cone stacking quartering method;
uniformly stirring the epoxy resin and the epoxy resin curing agent in a mass ratio of 10:4 along one direction until no thread exists, and obtaining cold glue;
and (2) putting 1g of the standby coal particles and the cold glue into a mold according to the mass ratio of 1:6, slowly adding 6g of the cold glue, and stirring along one direction until the mixture is uniformly mixed to obtain the premix.
B, defoaming the premix by adopting a negative pressure defoaming technology, and standing to obtain the briquette:
a first stage: maintaining at-30 KPa for 3min, discharging gas, recovering to standard atmospheric pressure, and repeating the first step for 2 times;
and a second stage: maintaining at-50 KPa for 3min, discharging gas, recovering to standard atmospheric pressure, and repeating the second step for 2 times;
and a third stage: maintaining at-70 KPa for 3min, discharging gas, recovering to standard atmospheric pressure, and repeating the third step for 3 times;
and (3) after bubble removal, placing the mixture in a thermostat with the temperature of 55 ℃ for standing for 2 hours to obtain the briquette.
Example 3
The embodiment of the invention provides a preparation method of a briquette, which comprises the following steps:
step a, taking 1Kg of coal sample, naturally drying, repeatedly crushing and sieving to obtain base coal particles with the particle size of less than or equal to 1mm, wherein the content of the coal-based particles with the particle size of less than 0.1mm is not more than 10 wt%. Weighing 100-200g of the air drying base coal particles with the granularity less than 1mm, and dividing the particles to 10-20g for later use by a cone stacking quartering method;
uniformly stirring the epoxy resin and the epoxy resin curing agent in a mass ratio of 10:5 along one direction until no thread exists, and obtaining cold glue;
and (2) putting 1g of the standby coal particles and the cold glue into a mold according to the mass ratio of 1:5.5, slowly adding 5.5g of the cold glue, and stirring along one direction until the mixture is uniformly mixed to obtain the premix.
B, defoaming the premix by adopting a negative pressure defoaming technology, and standing to obtain the briquette:
a first stage: maintaining at-25 KPa for 2.5min, deflating, recovering to standard atmospheric pressure, and repeating the first step for 3 times;
and a second stage: maintaining at-45 KPa for 2.5min, deflating, recovering to standard atmospheric pressure, and repeating the second step for 2 times;
and a third stage: maintaining at-65 KPa for 2.5min, deflating, recovering to standard atmospheric pressure, and repeating the third step for 3 times;
and (4) after bubble removal, standing for 6 hours in a fume hood at the temperature of 20 ℃ to obtain the briquette.
Comparative example 1
This comparative example provides a method of making a briquette, the method comprising the steps of:
step a, taking 1Kg of coal sample, naturally drying, repeatedly crushing and sieving to obtain base coal particles with the particle size of less than or equal to 1mm, wherein the content of the coal-based particles with the particle size of less than 0.1mm is not more than 10 wt%. Weighing 100-200g of the air drying base coal particles with the granularity less than 1mm, and dividing the particles to 10-20g for later use by a cone stacking quartering method;
uniformly stirring the epoxy resin and the epoxy resin curing agent according to the mass ratio of 10:3 along one direction until no thread exists, and obtaining cold glue;
and (2) putting 1g of the standby coal particles and the cold glue into a mold according to the mass ratio of 1:5, slowly adding 5g of the cold glue, and stirring along one direction until the mixture is uniformly mixed to obtain the premix.
And b, ultrasonically defoaming the premix, and standing to obtain the briquette.
The photo of the briquette obtained in the above is shown in fig. 2, and it can be seen from the figure that the briquette provided by the present comparative example has many bubbles and large bubbles, which affects the observation of the subsequent experiment.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A preparation method of a briquette is characterized by comprising the following steps: the preparation method at least comprises the following steps:
step a, pretreating a coal sample to obtain coal particles, stirring the coal particles and a binder in a mass ratio of 1:5-6 along the same direction until the coal particles and the binder are uniformly mixed to obtain a premix, wherein the binder is a cold glue obtained by mixing epoxy resin and a curing agent;
b, defoaming the premix, and standing to obtain the briquette, wherein the defoaming process comprises the following steps:
a first stage: keeping the pressure of-20 to-30 KPa for 2-3min, and recovering to the standard atmospheric pressure;
repeating the first step for 2-3 times;
and a second stage: keeping the pressure of-40 to-50 KPa for 2 to 3min, and recovering to the standard atmospheric pressure;
repeating the second step 2-3 times;
and a third stage: keeping the pressure of-60 to-70 KPa for 2 to 3min, and recovering to the standard atmospheric pressure;
repeating the third step for 2-3 times.
2. The process for the preparation of briquettes of claim 1, wherein: the cold glue is obtained by uniformly stirring the epoxy resin and the curing agent along the same direction until no thread exists.
3. The process for the preparation of briquettes of claim 2, wherein: the curing agent is an epoxy resin curing agent.
4. The process for the preparation of briquettes of claim 3, wherein: the mass ratio of the epoxy resin to the curing agent is 10: 3-5.
5. The process for the preparation of briquettes of claim 1, wherein: the standing temperature is 20-25 ℃, and the standing time is 4-6 h.
6. The process for the preparation of briquettes of claim 1, wherein: the standing temperature is 45-55 ℃ and the standing time is 1.5-2.5 h.
7. The process for the preparation of briquettes of claim 1, wherein: the coal sample pretreatment process comprises the following steps: naturally air-drying the coal sample, crushing and sieving to obtain base coal particles with the particle size of less than or equal to 1mm, air-drying the base coal particles, and performing reduction and separation by adopting a cone stacking quartering method to obtain the coal particles.
8. The method of making a briquette as set forth in claim 7, wherein: the content of the base coal particles with the particle size of less than 0.1mm in the base coal particles is not more than 10 wt%.
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| CN201810975789.0A CN108918230B (en) | 2018-08-24 | 2018-08-24 | Preparation method of coal brick |
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| CN201810975789.0A CN108918230B (en) | 2018-08-24 | 2018-08-24 | Preparation method of coal brick |
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| CN108918230B true CN108918230B (en) | 2020-09-18 |
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| US4007112A (en) * | 1974-05-30 | 1977-02-08 | Institut Francais Du Petrole, Des Carburants Et Lubrifiants Et Entreprise De Recherches Et D'activites Petrolieres Elf | Method of controlling a distillation column for topping crude petroleum |
| CN105821491A (en) * | 2016-06-01 | 2016-08-03 | 湖南大学 | Device for removing bubbles in pitch through vacuum auxiliary temperature differential method and bubble removing method thereof |
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| CN1128047C (en) * | 2000-08-22 | 2003-11-19 | 河南恒通源实业有限公司 | Steaming-pressing technology for forming high-strength powdered coal ash bricks |
| CN200995445Y (en) * | 2006-11-21 | 2007-12-26 | 郭瑛 | Exhausting air-pressurizing brick and blank distributer |
| CN102033005B (en) * | 2009-09-30 | 2012-12-26 | 上海宝钢化工有限公司 | Preparation method of asphalt sample for microscopic analysis of reflected light |
| CN202809016U (en) * | 2012-09-13 | 2013-03-20 | 湖北金环股份有限公司 | Viscose continuous defoaming device |
| CN203403062U (en) * | 2013-05-07 | 2014-01-22 | 中海油（青岛）重质油加工工程技术研究中心有限公司 | Bubble remover for asphalt |
| CN205246408U (en) * | 2015-11-05 | 2016-05-18 | 山东信华电力科技有限公司 | Continuous preforming system appearance device of coal |
| CN105400139A (en) * | 2015-11-27 | 2016-03-16 | 本钢板材股份有限公司 | Method for preparing coal rock pulverized coal polishing sheet |
| CN108947374A (en) * | 2016-07-28 | 2018-12-07 | 宁波高新区起兴机电有限公司 | A kind of method of multistage compacting flyash brick green body |
| CN206038396U (en) * | 2016-10-08 | 2017-03-22 | 中国地质科学院水文地质环境地质研究所 | Soil depressimeter pot clay end preprocessing device |
| CN107476192A (en) * | 2017-08-01 | 2017-12-15 | 傅国锋 | One kind, which has, vacuumizes function bridge concrete casting method |
| CN108254236B (en) * | 2018-01-26 | 2019-07-16 | 中国科学院武汉岩土力学研究所 | A kind of preparation method of geotechnical model test gassiness soil sample |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4007112A (en) * | 1974-05-30 | 1977-02-08 | Institut Francais Du Petrole, Des Carburants Et Lubrifiants Et Entreprise De Recherches Et D'activites Petrolieres Elf | Method of controlling a distillation column for topping crude petroleum |
| CN105821491A (en) * | 2016-06-01 | 2016-08-03 | 湖南大学 | Device for removing bubbles in pitch through vacuum auxiliary temperature differential method and bubble removing method thereof |
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Effective date of registration: 20210526 Address after: Zhai Shan, south suburb of Xuzhou City, Jiangsu Province Patentee after: China University of Mining and Technology Patentee after: HEBEI University OF ENGINEERING Address before: South Street, Hanshan District bright 056038 Hebei province Handan City No. 199 Patentee before: HEBEI University OF ENGINEERING |
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