CN115072730A - Energy-saving process for calcining coal series kaolin by double kilns - Google Patents
Energy-saving process for calcining coal series kaolin by double kilns Download PDFInfo
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Abstract
The invention provides an energy-saving process for calcining coal-based kaolin in a double kiln, and relates to the technical field of preparation of coal-based kaolin. The energy-saving process for calcining coal-series kaolin by two kilns comprises the following process steps: wet grinding process and dry grinding process. According to the invention, the calcined kaolin is prepared by adopting a dry method and a wet method, the waste heat of the flue gas of the dry method calcining furnace is used as a heat source, and the slurry in the wet method calcining process is heated and dried, so that the energy gradient utilization is fully realized, and the problem of high energy consumption is solved.
Description
Technical Field
The invention relates to the technical field of coal-series kaolin preparation, in particular to an energy-saving process for calcining coal-series kaolin in a double kiln.
Background
China has large coal-series kaolin reserves, good quality and wide distribution, and almost large coal mines are associated or symbiotic with kaolin. According to incomplete statistics, the proven reserves are 16.73 hundred million t, which account for about 10% of the world kaolin proven reserves. The coal-series kaolin is a valuable natural resource and an important non-metal mineral product, has higher utilization value, has stable chemical properties such as fire resistance, electrical insulation, chemical stability, dispersibility and the like after being calcined, is an ideal filler and extender, and can be widely applied to industries such as papermaking, rubber, paint, chemical industry, building materials, metallurgy, ceramics, glass, electroceramics, petroleum and the like. Especially in recent years, the modern science and technology is rapidly developed, so that the application field of the kaolin has wider prospects, a great amount of kaolin is also used as a new material in some high and new technical fields, even in high-temperature resistant porcelain parts in atomic reactors, space shuttles and space ships, the mineral components of China coal series kaolin prepared from the kaolin are mainly kaolinite, and the kaolinite content of most coal series kaolin ores is up to more than 90%.
In industrial production, kaolin can be divided into dry process and wet process, wherein the dry process is commonly used for selecting hard kaolin, and the wet process is commonly used for selecting soft and sandy kaolin. Wherein the flow chart of the process for calcining kaolin by coal gangue-the process for superfine calcination by dry method of coal gangue is as follows: raw ore → crushing → grinding → dried ultra-fine → calcining → product. The process flow is short. The process has the defects that the product grade is difficult to improve, strict requirements are imposed on the content of molten minerals in the product, the waste heat of tail gas is wasted, the energy utilization rate is low, and the tail gas cannot be utilized in a gradient way.
The method for calcining kaolin by coal gangue-the technological process of superfine recreating by coal gangue wet method is as follows: crushing raw ore, wet grinding, drying, calcining and reducing. The process mainly adopts a wet superfine process, so that the particle size of the product can easily reach-2 mu m-90 percent, the process is reliable, and the problems of impurities such as iron, titanium and the like are easily solved. The main disadvantages of the process are long process flow and high energy consumption.
At present, the superfine calcined kaolin is prepared by a wet method in China, but the energy consumption is too high. Therefore, the coal-series kaolin decarbonization process with high efficiency, low cost and environmental protection is developed, so that a kaolin product with higher purity and more suitable for further deep processing can be obtained, the comprehensive utilization of the coal-series kaolin is realized, the resources can be saved, and the environment is protected.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an energy-saving process for calcining coal-series kaolin by two kilns, and solves the problems that the energy consumption is too high in the wet method for preparing superfine calcined kaolin, and the waste heat of tail gas generated in the dry method for preparing kaolin is wasted, the energy utilization rate is low, and the superfine calcined kaolin cannot be utilized in a gradient way in the prior art.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the energy-saving process for calcining coal-series kaolin by two kilns is characterized by comprising the following process steps;
a wet grinding process:
1) crushing the coal-series kaolin raw material and the ingredients to a particle size of less than 5mm through a coarse crushing system;
2) feeding the material subjected to the coarse crushing in the previous step into a wet ball mill for ball milling, wherein the particle size d90 of the material subjected to ball milling is less than 2 microns;
3) the ball-milled material is sent into a wet superfine mill for superfine grinding, and the particle size d90 of the ground material is less than 2 mu m;
4) the materials ground in the previous step enter a first drying tower and a second drying tower;
5) the waste heat of 60-300 ℃ is discharged from the first drying tower and enters a first material dust remover;
6) the material discharged from the first drying tower and the material filtered by the first material dust remover enter a first breaker;
dry grinding process
7) Respectively crushing the coal-series kaolin raw material and the ingredients to the particle size of less than 5mm by a coarse crushing system II;
8) feeding the raw material and the ingredients of the coal-series kaolin subjected to the coarse crushing in the previous step into a dry ball mill or a vertical mill for grinding, wherein the particle size d90 of the ground material is less than 2 mu m;
9) feeding the ball-milled materials and ingredients into a pre-kiln bin II;
10) feeding the mixed material in the bin into a dry calcining rotary kiln, reversely inputting high-temperature gas at 850-1400 ℃ from the dry calcining rotary kiln, and heating and calcining the material;
11) the calcined material enters a wall cooler II, and is cooled to obtain a finished product material II;
12) after calcination in the dry calcination rotary kiln, the waste heat at 300-900 ℃ enters a separation device, the separated material enters a second kiln front storage bin again, the waste heat at 300-900 ℃ serves as a heat source and enters a second drying tower, and the wet superfine grinding material is dried;
13) the waste heat of 60-300 ℃ is discharged from the second drying device, enters a second material dust remover, is subjected to dust removal and purification, and then reaches a desulfurization device, and is discharged after desulfurization treatment;
14) the materials discharged from the second drying tower and the materials filtered by the second material dust remover enter a second breaker;
mixing
15) Mixing the materials of the first breaker and the second breaker, and then feeding the mixture into a first kiln front storage bin;
16) the material in the first kiln front bin enters the wet calcination rotary kiln through a feeder;
17) high-temperature gas at 850-1400 ℃ is reversely input from the wet calcination rotary kiln to heat and calcine the material, and the temperature of waste heat after calcination is 300-900 ℃;
18) the calcined material enters a first wall cooler to cool the material;
19) the cooled material enters a third scattering machine and is scattered into a finished product material I;
20) after calcination, the waste heat of 300-900 ℃ enters a drying tower to dry the material in the first drying tower.
Preferably, the separation device is any one of a hot air material separation device, a cloth bag dust removal device and a multi-cyclone dust separation device.
Preferably, the materials crushed by the first coarse crushing system and the second coarse crushing system are 325-6000 meshes.
Preferably, the material distributed to the first drying tower and the second drying tower in the wet grinding process is prepared according to the weight ratio of 1: 1-3 weight ratio.
Preferably, the gas after dust removal and purification in the first material dust remover and the second material dust remover reaches the desulfurizing tower, and is discharged after desulfurization treatment.
(III) advantageous effects
The invention provides an energy-saving process for calcining coal-series kaolin in a double kiln. The method has the following beneficial effects:
in the invention, the superfine calcined kaolin and the calcined kaolin are prepared by adopting a dry-wet combined method, the waste heat of the flue gas of the dry-method calciner is used as a heat source to heat and dry the materials in the wet-method calcination process, the energy gradient utilization is fully realized, and the problem of high energy consumption is solved.
Drawings
FIG. 1 is a process flow diagram of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1, the embodiment of the present invention provides an energy-saving process for calcining coal-based kaolin in two kilns, which includes the following processes;
a wet grinding process:
1) crushing a coal-series kaolin raw material and ingredients to 325-2250 meshes through a coarse crushing system;
2) feeding the material subjected to the coarse crushing in the previous step into a wet ball mill for ball milling, wherein the particle size d90 of the ball milled material is less than 2 mu m;
3) the materials after the ball milling in the last step are sent into a wet-process superfine grinding machine for superfine grinding, and the particle size d90 of the crushed materials is less than 2 mu m;
4) the materials ground out by the wet-process superfine grinding machine are distributed into a first drying tower and a second drying tower according to the weight ratio of 1: 1;
5) the residual hot gas at 60-300 ℃ from the first drying tower enters a first material dust remover, and the gas reaches a desulfurizing tower after being subjected to dust removal and purification and then being cooled, and is discharged after desulfurization treatment;
6) the materials discharged from the first drying tower and the materials filtered by the first material dust remover enter a first breaker, and the materials in the machine body are broken up under the action of the first breaker;
dry grinding process
7) Respectively crushing the coal-series kaolin raw material and the ingredients to the particle size of less than 5mm by a coarse crushing system II;
8) feeding the coal-series kaolin raw material and the ingredients after the coarse crushing in the previous step into a dry ball mill or a vertical mill for grinding, wherein the particle size d90 of the ground coal-series kaolin raw material and the ingredients is less than 2 mu m, and the dry ball mill or the vertical mill is selected;
9) feeding the coal series kaolin raw material and the ingredients which are ground in the previous step into a pre-kiln bin II;
10) feeding the material in the kiln front bin II into a dry calcining rotary kiln, reversely inputting high-temperature gas at 850 ℃ from the dry calcining rotary kiln, and heating and calcining the material in the dry calcining rotary kiln;
11) the material calcined in the previous step enters a wall cooler I, and is cooled to form a finished product material II, wherein the finished product material II is a product which is prepared by kaolin through a dry process;
12) after calcination in the dry calcination rotary kiln, the waste heat of 500 ℃ enters a hot air material separation device along with gas, and the separated material enters a pre-kiln bin II again; the separated 490 ℃ residual heat gas is used as a heat source to enter a second drying tower to dry the wet superfine grinding material;
13) the residual hot gas at 60 ℃ from the second drying tower enters a second material dust remover, the gas after dust removal and purification reaches a desulfurizing tower, and the gas is discharged after desulfurization treatment;
14) the materials discharged from the second drying tower and the materials filtered by the second material dust remover enter a second scattering machine for scattering;
mixing
15) Mixing the materials of the first breaker and the second breaker, and then feeding the mixture into a first kiln front storage bin;
16) the material in the first kiln front bin enters the wet calcination rotary kiln through a feeder;
17) high-temperature gas at 850 ℃ is reversely input from the wet calcination rotary kiln to heat and calcine the material, and the residual heat temperature of the gas exhausted after the calcination is 300 ℃;
18) the calcined material enters a first wall cooler to cool the material;
19) the cooled material enters a third scattering machine and is scattered into a finished product material I;
20) and (4) after the calcination, the residual heat gas at 300 ℃ enters a drying tower to dry the material in the first drying device.
The ingredients in the wet grinding process and the dry grinding process are all in the prior art, and the method is suitable for the production process of the coal-series kaolin raw material and any disclosed ingredients in the prior art.
In this embodiment, the gas at 60 ℃ in the desulfurization device can be further used for waste heat utilization according to the requirement before entering the desulfurization device, and is finally discharged from the desulfurization device.
Example two:
as shown in fig. 1, the embodiment of the present invention provides an energy-saving process for calcining coal-based kaolin in two kilns, which includes the following processes;
a wet grinding process:
1) crushing the coal-series kaolin raw material and the ingredients to 3250-6000 meshes through a coarse crushing system;
2) feeding the material subjected to the coarse crushing in the previous step into a wet ball mill for ball milling, wherein the particle size d90 of the ball milled material is less than 2 mu m;
3) the materials after the ball milling in the last step are sent into a wet-process superfine grinding machine for superfine grinding, and the particle size d90 of the crushed materials is less than 2 mu m;
4) the materials ground out by the wet-process superfine grinding machine are distributed into a first drying tower and a second drying tower according to the weight ratio of 1: 3;
5) the hot gas with the temperature of 300 ℃ discharged from the first drying tower enters a first material dust remover, the gas is cooled after dust removal and purification, and then reaches a desulfurization device, and is discharged after desulfurization treatment;
6) the materials discharged from the first drying tower and the materials filtered by the first material dust remover enter a first breaker, and the materials in the machine body are broken up under the action of the first breaker;
dry grinding process
7) Respectively crushing the coal-series kaolin raw material and the ingredients to the particle size of less than 5mm by a coarse crushing system II;
8) feeding the coal-series kaolin raw material and the ingredients after the coarse crushing in the previous step into a dry ball mill or a vertical mill for grinding, wherein the particle size d90 of the ground coal-series kaolin raw material and the ingredients is less than 2 mu m, and the dry ball mill or the vertical mill is selected;
9) feeding the coal series kaolin raw material and the ingredients which are ground in the previous step into a pre-kiln bin II;
10) feeding the material in the kiln front bin II into a dry calcining rotary kiln, reversely inputting high-temperature gas at 1400 ℃ from the dry calcining rotary kiln, and heating and calcining the material in the dry calcining rotary kiln;
11) the material calcined in the previous step enters a wall cooler I, and is cooled to form a finished product material II, wherein the finished product material II is a product which is prepared by kaolin through a dry process;
12) after calcination in the dry calcination rotary kiln, the waste heat of 700 ℃ enters multi-cyclone dust separation equipment along with gas, and the materials separated in the multi-cyclone dust separation equipment enter a kiln front bin II again; the separated residual heat gas with the temperature of 680 ℃ is used as a heat source to enter a second drying device to dry the wet superfine grinding material;
13) the residual hot gas at 300 ℃ from the second drying device enters a second material dust remover, the gas after dust removal and purification reaches a desulfurizing tower, and the gas is discharged after desulfurization treatment;
14) the materials discharged from the second drying device and the materials filtered by the second material dust remover enter a second scattering machine for scattering;
mixing
15) Mixing the materials of the first breaker and the second breaker, and then feeding the mixture into a first kiln front storage bin;
16) the material in the first kiln front bin enters the wet calcination rotary kiln through a feeder;
17) high-temperature gas at 1400 ℃ is reversely input from the wet calcination rotary kiln to heat and calcine the material, and the residual heat temperature of the discharged gas after calcination is 900 ℃;
18) the calcined material enters a first wall cooler to cool the material;
19) the cooled material enters a third scattering machine and is scattered into a finished product material I;
20) and (4) introducing the residual gas of 900 ℃ after calcination into a drying tower to dry the material in the first drying device.
The ingredients in the wet grinding process and the dry grinding process are all the prior art, and the method is suitable for the production process of the coal series kaolin raw material and any disclosed ingredients in the prior art.
In this embodiment, the gas at 300 ℃ in the desulfurization device can be further used for waste heat utilization according to the requirement before entering the desulfurization device, and is finally discharged from the desulfurization device.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (12)
1. The energy-saving process for calcining coal-series kaolin by two kilns is characterized by comprising the following process steps;
a wet grinding process:
1) crushing the coal-series kaolin raw material and the ingredients through a coarse crushing system;
2) feeding the material subjected to the coarse crushing in the previous step into wet grinding equipment for grinding, and then feeding the material into wet superfine grinding equipment for superfine grinding;
3) the materials ground in the last step enter a drying device I and a drying device II;
4) gas from the first drying device enters a first dust removing device, materials from the first drying device and materials filtered by the first dust removing device enter a first scattering machine, the gas after dust removal and purification reaches a desulfurizing device, and the gas is discharged after desulfurization treatment;
dry grinding process
5) Respectively crushing the coal-series kaolin raw material and the ingredients through a coarse crushing system II;
6) feeding the raw materials and the ingredients of the coal series kaolin coarsely crushed in the last step into dry grinding equipment for grinding, and then feeding the raw materials and the ingredients into a pre-kiln bin II;
7) feeding the materials in the bin into a dry-method calcination rotary kiln, reversely inputting high-temperature gas from the dry-method calcination rotary kiln, and heating and calcining the materials;
8) the calcined material enters a second cooling device, and is cooled to obtain a second finished product material;
9) the residual heat gas after the calcination of the dry calcination rotary kiln enters a separation device, the separated material enters a second kiln front storage bin again, and the residual heat gas from the separation device is used as a heat source to enter a second drying device for drying the wet superfine grinding material;
10) the gas from the drying device II enters a dust removing device II, and the material from the drying device II and the material filtered by the dust removing device II enter a second breaker; the gas after dust removal and purification reaches desulfurization equipment, and is discharged after desulfurization treatment;
mixing
11) Mixing the materials of the first breaker and the second breaker, and then feeding the mixture into a first kiln front storage bin;
12) the method comprises the following steps that materials in a kiln front bin I enter a wet-process calcination rotary kiln through a feeder, high-temperature gas is reversely input from the wet-process calcination rotary kiln to heat and calcine the materials, and gas discharged from the wet-process calcination rotary kiln enters a drying device I to dry the materials in the drying device I;
13) the calcined material enters a first cooling device to cool the material;
14) and feeding the cooled material into a third scattering machine, and scattering to obtain a finished product material I.
2. The energy-saving process for double-kiln calcination of coal-series kaolin as claimed in claim 1, characterized in that: the temperature of the residual heat gas calcined by the dry method calcination rotary kiln in the step 9) is 300-900 ℃, and the temperature of the residual heat gas discharged from the separation device is 300-900 ℃.
3. The energy-saving process for double-kiln calcination of coal-series kaolin as claimed in claim 1, characterized in that: the separation device in the step 9) is any one of a hot air material separation device, a cloth bag dust removal device and a multi-cyclone dust separation device.
4. The energy-saving process for double-kiln calcination of coal-series kaolin as claimed in claim 1, characterized in that: and in the step 2)6), the wet grinding equipment is a ball mill, and the dry grinding equipment is a ball mill or a vertical mill.
5. The energy-saving process for double-kiln calcination of coal-series kaolin as claimed in claim 1, characterized in that: and in the step 3), the step 4), the step 9), the step 10) and the step 12), the drying equipment is a drying tower, and the dust removal equipment is a material dust remover.
6. The energy-saving process for double-kiln calcination of coal-series kaolin as claimed in claim 1, characterized in that: and 8) feeding the calcined material in the step 13) into a cooling device, wherein the cooling device is a wall cooler.
7. The energy-saving process for double-kiln calcination of coal-series kaolin as claimed in claim 1, characterized in that: and 4) the desulfurization equipment which is reached by the gas subjected to dust removal and purification in the step 10) is a desulfurization tower.
8. The energy-saving process for double-kiln calcination of coal-series kaolin as claimed in claim 1, characterized in that: and in the step 1)5), the materials crushed by the first coarse crushing system and the second coarse crushing system are 325-6000 meshes.
9. The energy-saving process for double-kiln calcination of coal-series kaolin as claimed in claim 1, characterized in that: the particle size d90 of the ball-milled material in the wet grinding process in the step 2) is less than 2 μm, the particle size d90 of the ground material after being ground by a wet superfine mill in the wet grinding process is less than 2 μm, and the particle sizes d90 of the coal-series kaolin raw material and the ingredient after being ground by a dry ball mill or a vertical mill in the dry grinding process in the step 6) are less than 2 μm.
10. The energy-saving process for double-kiln calcination of coal-series kaolin as claimed in claim 1, characterized in that: the materials distributed into the first drying equipment and the second drying equipment in the wet grinding process in the step 3) are mixed according to the weight ratio of 1: 1-3 weight ratio.
11. The energy-saving process for double-kiln calcination of coal-series kaolin as claimed in claim 1, characterized in that: the residual heat temperature of the gas entering the first material dust removal device from the first drying device in the step 4) is 60-300 ℃, and the residual heat temperature of the gas entering the second material dust removal device from the second drying device in the step 10) is 60-300 ℃.
12. The energy-saving process for double-kiln calcination of coal-series kaolin as claimed in claim 1, characterized in that: the temperature of the high-temperature gas in the dry grinding process in the step 7) is 850-1400 ℃, the temperature of the high-temperature gas in the mixing process is 850-1200 ℃, and the temperature of the residual heat of the gas which is discharged from the wet calcination rotary kiln in the mixing process in the step 12) and enters the first drying device is 300-900 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116041985A (en) * | 2023-01-04 | 2023-05-02 | 山西金宇科林科技有限公司 | Energy-saving production method of superfine calcined kaolin |
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| CN102795633A (en) * | 2012-08-28 | 2012-11-28 | 北京矿冶研究总院 | Coal-series kaolin gaseous suspension calcining method |
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| CN112897541A (en) * | 2021-03-30 | 2021-06-04 | 天津水泥工业设计研究院有限公司 | High-activity metakaolin preparation system and preparation method |
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2022
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| CN2669115Y (en) * | 2003-10-08 | 2005-01-05 | 中国科学院过程工程研究所 | Rapid circulating fluidized calcining furnace for superfine kaoline calcining |
| CN102060302A (en) * | 2010-10-29 | 2011-05-18 | 内蒙古天之娇高岭土有限责任公司 | Process for preparing superfine high-activity metakaolin by utilizing vertical high-pressure mill |
| CN102795633A (en) * | 2012-08-28 | 2012-11-28 | 北京矿冶研究总院 | Coal-series kaolin gaseous suspension calcining method |
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| CN116041985A (en) * | 2023-01-04 | 2023-05-02 | 山西金宇科林科技有限公司 | Energy-saving production method of superfine calcined kaolin |
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