CN114111323A - Red mud clinker calcining preparation device and method - Google Patents
Red mud clinker calcining preparation device and method Download PDFInfo
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- CN114111323A CN114111323A CN202111176440.9A CN202111176440A CN114111323A CN 114111323 A CN114111323 A CN 114111323A CN 202111176440 A CN202111176440 A CN 202111176440A CN 114111323 A CN114111323 A CN 114111323A
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- 238000001354 calcination Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 75
- 239000002994 raw material Substances 0.000 claims abstract description 43
- 238000001704 evaporation Methods 0.000 claims abstract description 24
- 230000008020 evaporation Effects 0.000 claims abstract description 24
- 239000002002 slurry Substances 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000003546 flue gas Substances 0.000 claims abstract description 14
- 239000000428 dust Substances 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 14
- 230000009471 action Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 235000012054 meals Nutrition 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 239000003245 coal Substances 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000001089 mineralizing effect Effects 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000002918 waste heat Substances 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005245 sintering Methods 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B1/00—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids
- F26B1/005—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids by means of disintegrating, e.g. crushing, shredding, milling the materials to be dried
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
- F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/02—Preheating, e.g. in a laminating line
- F27M2003/025—Drying
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/03—Calcining
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention introduces a red mud clinker calcining preparation device and a method, comprising a raw material flash evaporation drying system and a clinker calcining system; the raw material flash evaporation drying system is connected with the clinker calcining system through a vertical air pipe. In the flash evaporation drying process of the red mud slurry raw material, the grading device in the drying chamber can be used for interlocking adjustment with the feeding amount and the hot air temperature in the system, so that the high-efficiency control of the moisture, the fineness and the uniformity of the raw material fed into the kiln is realized, and the continuous automatic operation of the system is facilitated; the raw material flash evaporation drying system is used for pretreating the red mud slurry raw material, the dried raw material powder qualified through drying and sorting is fed into a kiln to be calcined, and the dried water is directly discharged out through the raw material system, so that low-efficiency heat exchange working after the wet slurry is directly fed into the kiln is avoided; waste heat flue gas generated at the tail of the kiln is used as a heat source of the raw material flash evaporation drying system, so that the waste heat flue gas is efficiently and comprehensively utilized, the heat efficiency of the system is improved, and the energy consumption of the system is reduced.
Description
Technical Field
The invention belongs to the technical field of alumina production, and relates to a red mud clinker calcining preparation device and method.
Background
The red mud is taken as solid waste discharged in the industrial production of the alumina, which is unavoidable in the production flow and has larger yield, and the statistical amount of Al is 1 ton per production2O3About 1.2 to 1 is produced.3t of red mud, the domestic red mud stacking amount is nearly 11 hundred million tons, and the storage amount is extremely remarkable. At present, the utilization rate of the red mud in China is extremely low, the produced red mud can be only stockpiled for disposal in dam building modes such as flat ground platforms, valley barrage, concave filling and the like, the method not only occupies large-area land and consumes a great amount of yard building and maintenance cost, but also causes a plurality of problems such as air pollution, alkalinized soil, polluted underground water, dam breaking accidents and the like along with the passage of time, and therefore the production problem of the red mud becomes a heavy burden for the development of the alumina industry.
The chemical components of the red mud contain about up to 30 percent of Al2O3And 10% of Na2O, the Al elements and Na alkali can be reused for the production of alumina industry, and CaO and SiO in the components2、Fe2O3The effective calcium-silicon gelled component can realize the recycling and comprehensive utilization of resources through a sintering process. However, in the existing sintering process, the red mud slurry is directly injected into a kiln for calcination, so that the preheating section of the rotary kiln is prolonged and low-efficiency heat exchange work is inevitably performed, and meanwhile, hot flue gas discharged from the kiln at about 200 ℃ cannot be discharged into the atmosphere, so that the sintering process system is low in thermal efficiency and high in energy consumption.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a red mud clinker calcining preparation device and method, so that the functions of on-line drying, sorting and collecting of red mud slurry raw materials before entering a kiln are realized, the heat efficiency utilization is effectively improved finally, and the energy consumption of a system is reduced.
The technical scheme adopted by the invention is as follows:
a red mud clinker calcining preparation device comprises a raw material flash evaporation drying system and a clinker calcining system; the raw material flash evaporation drying system is connected with the clinker calcining system through a vertical air pipe;
the raw material flash evaporation drying system comprises a main drying pipe, a feeder, a stirring and crushing system, a grading ring, a cyclone separator, a bag type dust collector, a fan and conveying equipment; the upper part of the drying main pipe is provided with an air outlet, the lower part of the drying main pipe is sequentially provided with a feed inlet and an air inlet, and the feeder is connected with the feed inlet of the drying main pipe; the upper end of the vertical air pipe is connected with an air inlet of the drying main pipe; the stirring and crushing system is arranged in the lower end of the drying main pipe at the lower side of the feeding hole; the multi-layer grading rings are uniformly arranged on the upper side inside the drying main pipe; the air inlet of the cyclone separator is connected with the air outlet of the drying main pipe; the air inlet of the bag type dust collector is connected with the air outlet of the cyclone separator, and the air inlet of the fan is connected with the air outlet of the bag type dust collector; the discharge ports at the lower ends of the cyclone separator and the bag type dust collector are connected with conveying equipment, and the outlet of the conveying equipment is introduced into the kiln tail of the rotary kiln;
the clinker calcining system comprises a combustor, a kiln head cover and a rotary kiln; the burner is inserted in the kiln hood cover, one end of the burner coal injection pipe extends into the kiln mouth of the rotary kiln, and the kiln hood cover is arranged at the head of the rotary kiln; the hot flue gas outlet of the kiln tail of the rotary kiln is connected with the lower end of the vertical air pipe.
Specifically, the bottom of the drying main pipe is of an inverted cone structure, and the stirring and crushing system is arranged at the bottom of the drying main pipe at a position corresponding to the air inlet of the drying main pipe.
Specifically, the lower part of a drying main pipe of the raw material flash evaporation drying system is also connected with an external heat source.
Specifically, the cyclone separator is in a single-stage or multi-stage series connection mode.
Specifically, the conveying equipment is a chute, a belt conveyor, a bucket conveyor, an air conveying chute or a pneumatic conveying pump.
Specifically, the clinker temperature of the kiln head cover is 800-1000 ℃.
A method for preparing red mud clinker by calcining comprises the following specific steps:
the method comprises the following steps: the red mud slurry raw material enters a drying main pipe through a feeder, is in a fluidized state under the blowing action of hot air introduced by a vertical air pipe at the bottom or an external heat source, is continuously stirred and crushed by a stirring and crushing system, is continuously dried in the drying main pipe along with the upward airflow, and enables the particle size and the moisture to meet the requirements under the action of a grading ring to form dry raw material powder;
step two: the dried raw meal powder generated in the first step enters a cyclone separator and a bag type dust collector communicated with the cyclone separator from an air outlet at the upper end of a drying main pipe along with air flow, the collected qualified dried raw meal powder is conveyed into a rotary kiln through discharge ports of the cyclone separator and the bag type dust collector by conveying equipment, and purified clean gas is discharged into the atmosphere through a fan;
step three: continuously carrying out gas-solid heat exchange on dry raw material powder in a rotary kiln through high-temperature flue gas, preheating, decomposing and mineralizing the material in the kiln, and forming finished clinker at the calcining temperature of 1200-1400 ℃; discharging the high-temperature finished clinker through a kiln hood, then entering a subsequent cooling and storing process, wherein hot flue gas generated by calcining in the rotary kiln and the material move in a convection manner relatively, and then entering a raw material flash evaporation drying system through a vertical air pipe.
Due to the adoption of the technical scheme, the invention has the following advantages:
in the flash evaporation drying process of the red mud slurry raw material, the grading device in the drying chamber can be used for interlocking adjustment with the feeding amount and the hot air temperature in the system, so that the high-efficiency control of the moisture, the fineness and the uniformity of the raw material fed into the kiln is realized, and the continuous automatic operation of the system is facilitated; the raw material flash evaporation drying system is used for pretreating the red mud slurry raw material, the dried raw material powder qualified through drying and sorting is fed into a kiln to be calcined, and the dried water is directly discharged out through the raw material system, so that low-efficiency heat exchange working after the wet slurry is directly fed into the kiln is avoided; waste heat flue gas generated at the tail of the kiln is used as a heat source of the raw material flash evaporation drying system, so that the waste heat flue gas is efficiently and comprehensively utilized, the heat efficiency of the system is improved, and the energy consumption of the system is reduced.
Drawings
Fig. 1 is an overall schematic view of the present invention.
In the figure: 1-a combustor, 2-a kiln head cover, 3-a rotary kiln, 4-a vertical air pipe, 5-a feeder, 6-a stirring and crushing system, 7-a drying main pipe, 8-a grading ring, 9-a cyclone separator, 10-a bag type dust remover, 11-a fan and 12-conveying equipment.
Detailed Description
The invention is further explained below with reference to the drawings and examples, without thereby limiting the scope of protection of the invention, which is disclosed with the aim of protecting all technical modifications within the scope of the invention.
The red mud clinker calcining preparation device shown in the attached figure 1 comprises a raw material flash evaporation drying system and a clinker calcining system; the raw material flash evaporation drying system is connected with the clinker calcining system through a vertical air pipe 4.
The raw material flash evaporation drying system comprises a main drying pipe 7, a feeder 5, a stirring and crushing system 6, a grading ring 8, a cyclone separator 9, a bag type dust collector 10, a fan 11 and conveying equipment 12; the upper part of the main drying pipe 7 is provided with an air outlet, the lower part of the main drying pipe is sequentially provided with a feed inlet and an air inlet, and the feeder 5 is connected with the feed inlet of the main drying pipe 7; the upper end of the vertical air pipe 4 is connected with an air inlet of the drying main pipe 7; the stirring and crushing system 6 is arranged in the lower end of the drying main pipe 7 at the lower side of the feeding hole; the grading ring 8 is arranged at the upper side inside the main drying pipe 7; an air inlet of the cyclone separator 9 is connected with an air outlet of the drying main pipe 7; an air inlet of the bag type dust collector 10 is connected with an air outlet of the cyclone separator 9, and an air inlet of the fan 11 is connected with an air outlet of the bag type dust collector 10; the discharge ports at the lower ends of the cyclone separator 9 and the bag type dust collector 10 are connected with a conveying device 12, and the outlet of the conveying device 12 is introduced into the kiln tail of the rotary kiln 3; and the inlets and the outlets in the raw material flash evaporation drying system are sequentially connected by non-standard pipelines.
The clinker calcining system comprises a combustor 1, a kiln head cover 2 and a rotary kiln 3; the burner 1 is inserted in the kiln hood cover 2, one end of a coal injection pipe of the burner 1 extends into the kiln mouth of the rotary kiln 3, and the kiln hood cover 2 is arranged at the head of the rotary kiln 3; the kiln tail hot smoke outlet of the rotary kiln 3 is connected with the lower end of the vertical air pipe 4.
Preferably, the bottom of the main drying pipe 7 is in an inverted cone structure, and the stirring and crushing system 6 is arranged at the bottom of the main drying pipe 7 at a position corresponding to the air inlet of the main drying pipe 7.
Preferably, the stirring and crushing system 6 is powered by a motor arranged outside the main drying pipe 7.
Preferably, the heat source of the raw material flash evaporation drying system can additionally introduce an external heat source besides the kiln tail hot flue gas.
Preferably, the conveying apparatus 12 is a chute, a belt conveyor, a bucket conveyor, an air conveying chute, or an air conveying pump.
A method for preparing red mud clinker by calcining comprises the following specific steps:
the method comprises the following steps: the red mud slurry is a slurry consisting of red mud, alkali liquor or mother liquor, limestone powder and raw coal, and the water content of the slurry is 36-42%; the red mud slurry raw material enters a drying main pipe 7 through a feeder 5, the slurry is in a fluidized state under the blowing action of hot air introduced from a bottom vertical air pipe 4 or an external heat source, the slurry is continuously stirred and crushed by a stirring and crushing system 6, the fine particle raw material is continuously dried in the drying main pipe 4 along with the upward air flow, and the particle size and the moisture meet the requirements under the action of a grading ring 8, so that the dry raw material powder is formed.
Step two: the dried raw meal powder generated in the first step enters the cyclone separator 9 and the bag-type dust collector 10 communicated with the cyclone separator 9 from the air outlet at the upper end of the drying main pipe 7 along with the air flow, the collected qualified dried raw meal powder enters the rotary kiln 3 through the cyclone separator 9 and the discharge hole of the bag-type dust collector 10 through the conveying equipment 12, and the purified clean gas is discharged to the atmosphere through the fan 11.
Step three: the dried raw material powder is subjected to continuous gas-solid heat exchange in a rotary kiln 3 through high-temperature flue gas, the materials in the kiln are subjected to preheating, decomposition and mineral combination, and finished product clinker is formed at the calcining temperature of 1200-1400 ℃; discharging finished clinker at 800-1000 ℃ through a kiln head cover 2, and then entering a subsequent cooling and storing process, wherein hot flue gas generated by calcination in a rotary kiln 3 and materials move in a convection relative manner, and then enter a raw material flash evaporation drying system through a vertical air pipe 4.
The present invention is not described in detail in the prior art.
The embodiments selected for the purpose of disclosing the invention, are presently considered to be suitable, it being understood, however, that the invention is intended to cover all variations and modifications of the embodiments which fall within the spirit and scope of the invention.
Claims (7)
1. A red mud clinker calcining preparation device is characterized in that: comprises a raw material flash evaporation drying system and a clinker calcining system; the raw material flash evaporation drying system is connected with the clinker calcining system through a vertical air pipe;
the raw material flash evaporation drying system comprises a main drying pipe, a feeder, a stirring and crushing system, a grading ring, a cyclone separator, a bag type dust collector, a fan and conveying equipment; the upper part of the drying main pipe is provided with an air outlet, the lower part of the drying main pipe is sequentially provided with a feed inlet and an air inlet, and the feeder is connected with the feed inlet of the drying main pipe; the upper end of the vertical air pipe is connected with an air inlet of the drying main pipe; the stirring and crushing system is arranged in the lower end of the drying main pipe at the lower side of the feeding hole; the multi-layer grading rings are uniformly arranged on the upper side inside the drying main pipe; the air inlet of the cyclone separator is connected with the air outlet of the drying main pipe; the air inlet of the bag type dust collector is connected with the air outlet of the cyclone separator, and the air inlet of the fan is connected with the air outlet of the bag type dust collector; the discharge ports at the lower ends of the cyclone separator and the bag type dust collector are connected with conveying equipment, and the outlet of the conveying equipment is introduced into the kiln tail of the rotary kiln;
the clinker calcining system comprises a combustor, a kiln head cover and a rotary kiln; the burner is inserted in the kiln hood cover, one end of the burner coal injection pipe extends into the kiln mouth of the rotary kiln, and the kiln hood cover is arranged at the head of the rotary kiln; the hot flue gas outlet of the kiln tail of the rotary kiln is connected with the lower end of the vertical air pipe.
2. The red mud clinker calcination preparation apparatus according to claim 1, wherein: the drying be responsible for the bottom and be the back taper structure, the broken system setting of stirring is responsible for the bottom at the drying that is responsible for the air intake corresponding position department with the drying.
3. The red mud clinker calcination preparation apparatus according to claim 1, wherein: the lower part of the drying main pipe of the raw material flash evaporation drying system is also connected with an external heat source.
4. The red mud clinker calcination preparation apparatus according to claim 1, wherein said cyclone is in the form of a single-stage or multi-stage series connection.
5. The red mud clinker calcination preparation apparatus according to claim 1, wherein: the conveying equipment is a chute, a rubber belt conveyor, a bucket conveyor, an air conveying chute or a pneumatic conveying pump.
6. The red mud clinker calcination preparation apparatus according to claim 1, wherein: and the clinker temperature of the kiln head cover is 800-1000 ℃.
7. A method of using the red mud clinker calcination preparation device according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:
the method comprises the following steps: the red mud slurry raw material enters a drying main pipe through a feeder, is in a fluidized state under the blowing action of hot air introduced by a vertical air pipe at the bottom or an external heat source, is continuously stirred and crushed by a stirring and crushing system, is continuously dried in the drying main pipe along with the upward airflow, and enables the particle size and the moisture to meet the requirements under the action of a grading ring to form dry raw material powder;
step two: the dried raw meal powder generated in the first step enters a cyclone separator and a bag type dust collector communicated with the cyclone separator from an air outlet at the upper end of a drying main pipe along with air flow, the collected qualified dried raw meal powder is conveyed into a rotary kiln through discharge ports of the cyclone separator and the bag type dust collector by conveying equipment, and purified clean gas is discharged into the atmosphere through a fan;
step three: continuously carrying out gas-solid heat exchange on dry raw material powder in a rotary kiln through high-temperature flue gas, preheating, decomposing and mineralizing the material in the kiln, and forming finished clinker at the calcining temperature of 1200-1400 ℃; discharging the high-temperature finished clinker through a kiln hood, then entering a subsequent cooling and storing process, wherein hot flue gas generated by calcining in the rotary kiln and the material move in a convection manner relatively, and then entering a raw material flash evaporation drying system through a vertical air pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111176440.9A CN114111323A (en) | 2021-10-09 | 2021-10-09 | Red mud clinker calcining preparation device and method |
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| CN202111176440.9A CN114111323A (en) | 2021-10-09 | 2021-10-09 | Red mud clinker calcining preparation device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100032385A1 (en) * | 2006-06-28 | 2010-02-11 | Taiheiyo Cement Corporation | Cement burning apparatus and method of drying high-water-content organic waste |
| CN202016883U (en) * | 2011-03-03 | 2011-10-26 | 东北大学设计研究院（有限公司） | Device for producing alumina clinker in semidry method |
| CN111874929A (en) * | 2020-09-08 | 2020-11-03 | 南京凯盛国际工程有限公司 | Alumina clinker dry calcining system and working principle thereof |
| CN112010332A (en) * | 2020-09-08 | 2020-12-01 | 南京凯盛国际工程有限公司 | Aluminum oxide clinker preparation system and process flow thereof |
| CN213713717U (en) * | 2020-11-05 | 2021-07-16 | 常州市苏力干燥设备有限公司 | Novel rotary flash evaporation dryer |
-
2021
- 2021-10-09 CN CN202111176440.9A patent/CN114111323A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100032385A1 (en) * | 2006-06-28 | 2010-02-11 | Taiheiyo Cement Corporation | Cement burning apparatus and method of drying high-water-content organic waste |
| CN202016883U (en) * | 2011-03-03 | 2011-10-26 | 东北大学设计研究院（有限公司） | Device for producing alumina clinker in semidry method |
| CN111874929A (en) * | 2020-09-08 | 2020-11-03 | 南京凯盛国际工程有限公司 | Alumina clinker dry calcining system and working principle thereof |
| CN112010332A (en) * | 2020-09-08 | 2020-12-01 | 南京凯盛国际工程有限公司 | Aluminum oxide clinker preparation system and process flow thereof |
| CN213713717U (en) * | 2020-11-05 | 2021-07-16 | 常州市苏力干燥设备有限公司 | Novel rotary flash evaporation dryer |
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