CN110220386A - A kind of kaolin powder pre-heating system and kaolin powder calcination system and method for calcinating comprising it - Google Patents
A kind of kaolin powder pre-heating system and kaolin powder calcination system and method for calcinating comprising it Download PDFInfo
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- CN110220386A CN110220386A CN201910481699.0A CN201910481699A CN110220386A CN 110220386 A CN110220386 A CN 110220386A CN 201910481699 A CN201910481699 A CN 201910481699A CN 110220386 A CN110220386 A CN 110220386A
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- kaolin
- temperature
- powder
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- preheating
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/36—Silicates having base-exchange properties but not having molecular sieve properties
- C01B33/38—Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
- C01B33/40—Clays
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- 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
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
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- 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
- F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
- F27D15/02—Cooling
- F27D15/0206—Cooling with means to convey the charge
- F27D15/028—Cooling with means to convey the charge comprising a rotary drum
-
- 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
- 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
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
- F27D2013/007—Apparatus for preheating charges; Arrangements for preheating charges using a rotary furnace
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- 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
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The present invention provides a kind of kaolin powder pre-heating system and comprising its kaolin powder calcination system and method for calcinating, the kaolin powder pre-heating system includes passing through the sequentially connected feed unit of smoke-exhaust pipeline and dust removing units；The dust removing units include sequentially connected cyclone dust collectors and bag filter according to the flow direction of material of kaolin powder.Pre-heating system provided by the invention is preheated especially for 325 mesh kaolin powders, cooperation subsequent calcination workshop section realizes the direct contact heat transfer of kaolin original powder and high-temperature flue gas, not only increase heat exchange efficiency, large-scale redevelopment is carried out without to existing calcination system, pre-heating system provided by the invention is not particularly limited the kiln type of subsequent calcination kiln simultaneously, and volume production and calcining unit consumption are also significantly better than industry mainstream.
Description
Technical field
The invention belongs to calcining technology fields, are related to a kind of pre-heating system and calcination system and method for calcinating comprising it,
More particularly to a kind of kaolin powder pre-heating system and kaolin powder calcination system and method for calcinating comprising it.
Background technique
Kaolin is a kind of mixture of inorganic non-metallic, and kaolin is exactly sintered to by calcined kaolin in calcining furnace
Certain temperature and time makes its physical and chemical performance generate certain variation, to meet certain requirement.Kaolin is one
The mixture of kind inorganic non-metallic, calcined kaolin is exactly that kaolin is sintered to certain temperature and time in calcining furnace,
Its physical and chemical performance is set to generate certain variation, to meet certain requirement.
The average annual consumption figure of Chinese kaolin is about 3,000,000 tons, and there are about 70% kaolin to be used for ceramic material, specific to be distributed
For building, bathroom, daily and other ceramics, proportion is respectively 40%, 30%, 20% and 10%.325 mesh calcined kaolins
It is mainly used for various ceramic glazes, calcining mainly uses tunnel oven or rotary kiln.There are upper and lower temperature differences for tunnel oven greatly, product
Unstable quality；It is low using artificial handling saggar and kiln car, the degree of automation；Kiln car and saggar accumulation of heat loss are big, overall thermal
The inherent defects such as low efficiency belong to the kiln type that is gradually eliminated, just gradually replace tunnel oven to calcine 325 mesh using rotary kiln in industry
Kaolin.
CN102060302A discloses a kind of technique that ultrafine high activity metakaolin is prepared using vertical high pressure mill, first will
Kaolin raw ore is crushed to 325 ± 30 mesh, then by obtaining granular size after the mill grinding of vertical high pressure is 2~2.5 μm ultra-fine
This ultrafine kaolin is transmitted to rotary kiln charging system by blower afterwards by kaolin powder material, will by automatic charging equipment
Ultrafine kaolin is added into rotary kiln, after in rotary kiln through 600~900 DEG C of high-temperature calcinations, calcination time is 1~4 hour,
The ultra-fine metakaolin product prepared.
CN108046750A discloses a kind of alukalin raw powder's production technology, by kaolin starting material in dry Vertical Mill
Middle progress grinding homogenizing preheats cylinder into three-level, and after completing flash calcining into calcining furnace, high temperature powder is separated with thermal current
Cylinder separation, micro mist enter cartridge type cooler via pipeline, and First air is cooling by high temperature material block in cartridge type cooler and incites somebody to action in kiln tail
Expect that block is collected, the material after collection levigate can be made≤micro mist of 0.044mm fine powder or≤0.010mm.
CN105347838A discloses a kind of method using electroplating sludge production light ceramic, comprising the following steps: (1)
Raw material is provided by weight ratio；(2) by electroplating sludge wet-milling to 150~200 mesh, by municipal sludge, decomposed rock, mud, clay
Or kaolin is dry grinded to 100~150 mesh, and anthracite is dry grinded to 100~150 mesh, and iron oxide or bloodstone are dry grinded to 100~
150 mesh；(3) various raw materials are carried out uniformly mixed；(4) mixed material is subjected to depth refinement, pottery is squeezed by pelletizer
Grain raw material；(5) by Dual-barrel rotary kiln by the preheating of haydite raw material, be sintered into light ceramic, discharging, it is cooling after obtain haydite at
Product.
Existing calcined by rotary kiln technique has the following technical problems:
(1) rotary kiln high-temperature flue gas lacks low-cost high-efficiency Utilization plan
Ceramics are calcined with 325 mesh calcined kaolins using dry-process rotory kiln, 400-600 DEG C of rotary kiln high-temperature flue-gas,
For this part high-temperature flue gas, current in industry there are mainly two types of Land use systems.
Mode one: rotary kiln high-temperature tail gas is passed through in indirect heat exchanger, is used for warm-up combustion-supporting air, combustion-supporting after preheated
Air return combustion system is combustion-supporting, and high-temperature tail gas enters subsequent dust-removing process after heat transfer cooling.In this way, exhaust gas heat
Can utilization rate be only 30% or so, and in use, kaolin powder is easily accumulated, bonding with inside heat exchanger, into one
Step reduces its heat exchange efficiency.Indirect type heat exchanger is made of common heat resisting steel, and anti-corrosion capability is poor, harmful gas in rotary kiln exhaust gas
Body will cause corrosion, the lost of life inside heat exchanger.
Mode two: using the multistage cyclone pre-heating system similar with cement kiln, realizes tail gas and contacts with the direct of material
Heat transfer, heat exchanger effectiveness is high, the thermal energy of tail gas is taken full advantage of, and in preheating precalcining can occur for material, by knot therein
Brilliant water evaporates in advance, shortens calcination time, improves production efficiency.But such method equipment investment is big, land occupation is big, to production
Line change is also larger, is only suitable for large-scale production [1].
(2) kiln discharge high-temperature material sensible heat can not efficiently use
For kiln discharge temperature of charge at 900-1000 DEG C, material sensible heat accounts for the 20%-25% of whole heat consumption, main in industry at present
Using air cooling way, that is, a large amount of cold wind are used, while conveying material, material is cooled to 30-50 DEG C, but cooling wind preheats
Temperature only has 100-150 DEG C, can not efficiently use, and causes a large amount of wastes.
(3) raw ore adaptability is bad
Existing calcined by rotary kiln technique, because heat-supplying mode and kilneye material limit, firing temperature is no more than 1200 DEG C；
Means are efficiently utilized because kiln exit gas lacks, exhaust gas temperature is unsuitable excessively high, and at 400-600 DEG C, this results in existing general control
Firing system is bad to raw ore adaptability, be only suitable for calcine loss on ignition it is low, the low part raw ore of carbon content is big for loss on ignition,
The high most of raw ores of carbon content, the decline of the indexs such as yield and firing whiteness are obvious.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide a kind of kaolin powder pre-heating system, packet
Containing its kaolin powder calcination system and method for calcinating, the present invention is used complete by improving to kiln tail pre-heating system
New firing system, improves heat exchange efficiency in kiln, using the material sensible heat of kiln discharge, significantly reduces exhaust gas temperature.
To achieve this purpose, the present invention adopts the following technical scheme:
In a first aspect, the present invention provides a kind of kaolin powder pre-heating system, the kaolin powder pre-heating system
Including passing through the sequentially connected feed unit of smoke-exhaust pipeline and dust removing units.
The dust removing units include that sequentially connected cyclone dust collectors and cloth bag remove according to the flow direction of material of kaolin powder
Dirt device.
Pre-heating system provided by the invention is preheated especially for 325 mesh kaolin powders, and cooperates subsequent calcination work
Section realizes the direct contact heat transfer of kaolin original powder and high-temperature flue gas, heat exchange efficiency is not only increased, without to existing
Calcination system carries out large-scale redevelopment, while pre-heating system provided by the invention does not have special limit to the kiln type of subsequent calcination kiln
System, volume production and calcining unit consumption are also significantly better than industry mainstream.
Specifically, one of the advantage of kaolin powder pre-heating system provided by the invention is, the present invention is by kaolin
Original powder is fed directly into the smoke-exhaust pipeline of calciner plant, so that kaolin original powder is directly contacted with high-temperature flue gas, heat exchange efficiency is high
Heat exchange and de- crystallization water process can be completed in (temperature difference is big, flow velocity is fast), 2s or so, this set pre-heating system heat exchange efficiency is high, discharges fume
Temperature is low, small to the change of existing calcining production line, and improvement cost is low, is suitble to the scrap build and grassroot project of medium-sized and small enterprises.
In addition to this, the two of the advantage of kaolin powder pre-heating system provided by the invention are, in traditional calcining system
It is the returning charge amount (general control is within 5%) for reducing calcining kiln in system, wind speed and material raising in kiln in kiln need to be controlled
Overturning rate causes heat exchange efficiency in kiln low.Using kaolin powder calcination system provided by the invention, due to kaolin original powder sheet
Body will feed calcining kiln by smoke-exhaust pipeline, even if original powder material, which is blown off back kiln tail, to return kiln by smoke-exhaust pipeline
It is interior, therefore, the returning charge amount limitation of calcining kiln can substantially be relaxed (control is within 20%), wind speed and material are in kiln in kiln
Raising overturning rate can also correspondingly increase, and heat exchange efficiency in kiln not only can be improved, but also the exhaust gas temperature of kiln tail can also greatly improve,
The yield of calcining kiln and there is different degrees of raising to the adaptability of raw ore in this way.
Those skilled in the art is it is to be understood that pre-heating system provided by the invention needs that calcination system is cooperated to make
With, but the present invention does not specially require subsequent workshop section using the calcination system of which kind of form or kiln type, need to be ensured that, preheats
The high-temperature flue gas that heat in system should be generated from subsequent calcination kiln kiln tail, by the way that high-temperature flue gas is passed through the preheating system
In the smoke-exhaust pipeline of system, realize by and using high-temperature flue gas that kiln tail generates to the pre-heat treatment of kaolin original powder, as long as can
To realize that any one calcination system of above-mentioned technical proposal can be used cooperatively with pre-heating system provided by the invention.
As a preferred technical solution of the present invention, it is provided with conveying device below the discharge port of the dust removing units,
The conveying device is used to accepting and transmitting the kaolin powder after preheating.
Preferably, feed inlet, discharge port and gas outlet are provided on the shell of the cyclone dust collectors.
Preferably, feed inlet, discharge port and gas outlet are provided on the shell of the bag filter.
Preferably, conveying device is provided with below the discharge port of the discharge port of the cyclone dust collectors and bag filter.
Preferably, the feed inlet of the cyclone dust collectors connects the outlet end of the smoke-exhaust pipeline.
Preferably, the gas outlet of the cyclone dust collectors connects the feed inlet of the bag filter.
Preferably, the gas outlet of the bag filter connects tail gas air-introduced machine.
Preferably, the cyclone dust collectors are four cyclone dust collectors.
Preferably, the conveying device is screw conveyor.
As a preferred technical solution of the present invention, the feed unit includes the storage bin and discharging dress of connection
It sets.
Preferably, feed inlet is provided on the smoke-exhaust pipeline, the discharge port connection smoke-exhaust pipeline of the device for discharging
Feed inlet.
Preferably, the device for discharging is Star-like unloader.
Second aspect, the present invention provides a kind of kaolin powder pre-heating means, using kaolin described in first aspect
Powder pre-heating system preheats kaolin original powder.
The pre-heating mean includes: that kaolin original powder is delivered in smoke-exhaust pipeline by feed unit, is produced with rotary kiln
Raw high-temperature flue gas contact, after being fully warmed-up, via being discharged after cyclone dust collectors and bag filter dedusting.
As a preferred technical solution of the present invention, the pre-heating mean includes: the kaolin original powder in storage bin
It is sent into smoke-exhaust pipeline through device for discharging, the high-temperature flue gas generated with rotary kiln contacts, and the kaolin after being fully warmed-up is via rotation
Wind deduster and bag filter dedusting heel row go out to fall into conveying device, and flue gas is emptied via tail gas air-introduced machine after preheating.
Preferably, the temperature of the high-temperature flue gas is 550~900 DEG C, such as can be 550 DEG C, 600 DEG C, 650 DEG C, 700
DEG C, 750 DEG C, 800 DEG C, 850 DEG C or 900 DEG C.
Preferably, the kaolin powder temperature being discharged after the cyclone dust collectors dedusting is 300~350 DEG C, such as can be with
It is 300 DEG C, 305 DEG C, 310 DEG C, 315 DEG C, 320 DEG C, 325 DEG C, 330 DEG C, 335 DEG C, 340 DEG C, 345 DEG C or 350 DEG C.
Preferably, the kaolin powder temperature being discharged after the bag filter dedusting is 60~90 DEG C, such as be can be
60 DEG C, 62 DEG C, 64 DEG C, 66 DEG C, 68 DEG C, 70 DEG C, 72 DEG C, 74 DEG C, 76 DEG C, 78 DEG C, 80 DEG C, 82 DEG C, 84 DEG C, 86 DEG C, 88 DEG C or
90℃。
Preferably, the temperature of the kaolin powder after kaolin powder pre-heating system preheating is 270~320
DEG C, such as can be 270 DEG C, 275 DEG C, 280 DEG C, 285 DEG C, 290 DEG C, 295 DEG C, 300 DEG C, 305 DEG C, 310 DEG C, 315 DEG C or 320
℃。
Preferably, the emptying temperature of flue gas is 250~300 DEG C after the preheating, such as can be 250 DEG C, 255 DEG C, 260
DEG C, 265 DEG C, 270 DEG C, 275 DEG C, 280 DEG C, 285 DEG C, 290 DEG C, 295 DEG C or 300 DEG C.
The third aspect, the present invention provides a kind of kaolin powder calcination system, the kaolin powder calcination system
Including sequentially connected preheating unit, calcining unit and cooling unit.
The preheating unit is using kaolin powder pre-heating system as described in relation to the first aspect.
The exhanst gas outlet of the smoke-exhaust pipeline input end connection calcining unit of the preheating unit.
One of the advantage of calcination system provided by the invention is: limiting smaller, volume production to the kiln type of calcining kiln
It is apparently higher than industry mainstream, for the raw ore low for loss on ignition, mainstream volume production is 19-20kg/m in industry3H, and
The volume production of calcination system provided by the invention is up to 22.8kg/m3H promotes amplitude 10% or more.For loss on ignition
High raw ore, the calcination system in industry is not used to always the kaolinic calcine technology of 325 mesh, and calcining provided by the invention is
System successfully calcines out 325 qualified mesh products using 48m length rotary kiln, and volume production can also reach 14.2kg/m3。
The two of the advantage of calcination system provided by the invention are: being also significantly better than industry mainstream in terms of calcining unit consumption
Calcination system calcines 325 mesh kaolin, and for low loss on ignition raw ore, calcining unit consumption is generally 950- in industry
1000kcal/kg product, using calcination system provided by the invention, according to Shandong production line scheduling and planning measured result table
Bright, calcining unit consumption is 824kcal/kg product, 15% or more energy conservation.
As a preferred technical solution of the present invention, the calcining unit includes sequentially connected calciner plant and confession
Thermal.
Preferably, the calciner plant is rotary kiln.
Preferably, the rotary kiln is provided with exhanst gas outlet close to one end of preheating unit, and the exhanst gas outlet connects institute
State the input end of smoke-exhaust pipeline.
Preferably, the rotary kiln is additionally provided with feed component close to the side of preheating unit.
Preferably, the feed component includes the constant-current stabilizer and drawing-in device of connection, and the constant-current stabilizer is for accepting
The flow of kaolin powder and stable kaolin powder after the preheating that conveying device transmission comes, the drawing-in device is for controlling height
The calcining inlet amount of ridge soil powder.
Preferably, the rotary kiln is provided with discharge port far from the side of preheating unit.
Preferably, the rotary kiln is additionally provided with heating plant far from the side of preheating unit, and the heating plant is used for
Calcining required temperature is provided into rotary kiln.
Preferably, the heating plant is fuel gas hot-blast stove.
Preferably, the air inlet of the fuel gas hot-blast stove is separately connected with warm blower and combustion fan.
As a preferred technical solution of the present invention, the cooling unit includes cooling device.
Preferably, the cooling device is single cylinder cooling machine.
Preferably, one end of the single cylinder cooling machine is provided with feed inlet, and the other end is provided with air inlet and discharge port, institute
The discharge port of feed inlet connection rotary kiln is stated, the air inlet connects cooling blower, the road of discharge nozzle locating for the discharge port
It is provided with outlet valve.
Preferably, adjusting is provided on the connecting line of the feed inlet of the single cylinder cooling machine and the rotary kiln discharge port
Device.
Preferably, the regulating device is gas material channel adjuster.
Preferably, the outlet valve is double flap valves.
Preferably, cooling medium spray equipment is additionally provided with above the cooling device.The high temperature kaolin powder of kiln discharge
After body enters cooling device, the cold wind blasted with cooling blower carries out sufficient heat exchange, it is heated after cold wind pass through gas material
Channel adjuster is again introduced into kiln, and the drop temperature of cooling device is adjusted by outer wall chilling spray water water, meanwhile, it is
Ensure system stability, cold wind can be bypassed after a set of heating is added in the feed end side of cooling device, to adjust cooling dress
Set interior negative pressure.Using such mode, kiln discharge material sensible heat can utilize 20%-40%.
Fourth aspect, the present invention provides a kind of kaolin powder method for calcinating, using kaolin described in the third aspect
Powder calcination system calcines kaolin original powder, and the method for calcinating includes:
Feeding calcining unit, is sent into after high-temperature calcination after kaolin original powder is preheated to 270~320 DEG C by preheating unit
Cooling unit cooling obtains calcined kaolin.
As a preferred technical solution of the present invention, the method for calcinating includes:
(I) preheat: the kaolin original powder in storage bin is sent into smoke-exhaust pipeline through device for discharging, the height generated with rotary kiln
Warm smoke contacts, the kaolin after being fully warmed-up go out to fall into conveying dress via cyclone dust collectors and bag filter dedusting heel row
It sets, flue gas is emptied via tail gas air-introduced machine after preheating；
(II) calcine: the kaolin powder after preheating is sent into constant-current stabilizer by conveying device, passes through drawing-in device after current stabilization
It is delivered in calciner plant and carries out high-temperature calcination, heating plant provides calcining required temperature into calciner plant；
(III) cooling: the kaolin powder after high-temperature calcination is sent into cooling device by regulating device, in cooling blower
The kaolin powder after high-temperature calcination is cooled down to obtain calcined kaolin under the action of cooling medium spray equipment.
Preferably, the temperature of high-temperature flue gas described in step (I) be 550~900 DEG C, such as can be 550 DEG C, 600 DEG C,
650 DEG C, 700 DEG C, 750 DEG C, 800 DEG C, 850 DEG C or 900 DEG C.
Preferably, the kaolin powder temperature being discharged after cyclone dust collectors dedusting described in step (I) is 300~350 DEG C,
Such as it can be 300 DEG C, 305 DEG C, 310 DEG C, 315 DEG C, 320 DEG C, 325 DEG C, 330 DEG C, 335 DEG C, 340 DEG C, 345 DEG C or 350 DEG C.
Preferably, the kaolin powder temperature being discharged after bag filter dedusting described in step (I) is 60~90 DEG C, example
It such as can be 60 DEG C, 62 DEG C, 64 DEG C, 66 DEG C, 68 DEG C, 70 DEG C, 72 DEG C, 74 DEG C, 76 DEG C, 78 DEG C, 80 DEG C, 82 DEG C, 84 DEG C, 86
DEG C, 88 DEG C or 90 DEG C.
Preferably, described in step (I) preheat after flue gas emptying temperature be 250~300 DEG C, such as can be 250 DEG C,
255 DEG C, 260 DEG C, 265 DEG C, 270 DEG C, 275 DEG C, 280 DEG C, 285 DEG C, 290 DEG C, 295 DEG C or 300 DEG C.
Preferably, the temperature of the kaolin powder after step (II) described preheating is 270~320 DEG C, such as can be 270
DEG C, 275 DEG C, 280 DEG C, 285 DEG C, 290 DEG C, 295 DEG C, 300 DEG C, 305 DEG C, 310 DEG C, 315 DEG C or 320 DEG C.
Preferably, step (II) the calcining required temperature be 900~1350 DEG C, such as can be 900 DEG C, 950 DEG C,
1000 DEG C, 1050 DEG C, 1100 DEG C, 1150 DEG C, 1200 DEG C, 1250 DEG C, 1300 DEG C or 1350 DEG C, it is further preferred that described forge
Burning required temperature is 1250~1300 DEG C.
Numberical range of the present invention not only includes enumerated point value, further includes the above-mentioned numerical value not included
Arbitrary point value between range, as space is limited and for concise consideration, range described in the present invention no longer exclusive list includes
Specific point value.
The system refers to device systems, apparatus system or process units, belongs to the product on patent law purposes.
Compared with prior art, the invention has the benefit that
(1) kaolin original powder is fed directly into the smoke-exhaust pipeline of calciner plant by the present invention, so that kaolin original powder and height
Warm flue gas directly contacts, and heat exchange and de- crystallization water process can be completed in heat exchange efficiency height (temperature difference is big, flow velocity is fast), 2s or so, this
It is low to cover pre-heating system heat exchange efficiency height, exhaust gas temperature, small to the change of existing calcining production line, improvement cost is low, is suitble to medium and small
The scrap build and grassroot project of enterprise.
(2) it is the returning charge amount (general control is within 5%) for reducing calcining kiln in traditional calcination system, kiln need to be controlled
Interior wind speed and material raise overturning rate in kiln, cause heat exchange efficiency in kiln low.Using kaolin powder provided by the invention
Calcination system, since kaolin original powder inherently will feed calcining kiln by smoke-exhaust pipeline, even if original powder material is blown off back kiln
Tail can also be returned in kiln by smoke-exhaust pipeline, therefore, the limitation of the returning charge amount of calcining kiln can substantially be relaxed (control 20% with
It is interior), wind speed and material raising overturning rate and can also correspondingly increase in kiln, not only can be improved heat exchange efficiency in kiln in kiln, but also
The exhaust gas temperature of kiln tail can also greatly improve, and the yield of such calcining kiln and have different degrees of mention to the adaptability of raw ore
It is high.
(3) the kiln type limitation of calcine technology and calcination system rotary kiln provided by the invention is smaller, and volume production is also obvious
Higher than industry mainstream, for the raw ore low for loss on ignition, mainstream volume production is 19-20kg/m in industry3H, and this hair
The volume production of the calcination system of bright offer is up to 22.8kg/m3H promotes amplitude 10% or more.For loss on ignition plateau
Mine, the calcination system in industry is not used to always the kaolinic calcine technology of 325 mesh, and calcination system provided by the invention is sharp
325 qualified mesh products are successfully calcined out with 48m length rotary kiln, and volume production can also reach 14.2kg/m3。
(4) there is also clear superiorities in terms of calcining unit consumption for calcination system provided by the invention, the calcining with industry mainstream
Technique is compared, and calcine technology provided by the invention can save energy 15% or more.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the kaolin powder pre-heating system that a specific embodiment of the invention provides；
Fig. 2 is the structural schematic diagram for the kaolin powder calcination system that a specific embodiment of the invention provides；
Wherein, 1- storage bin；2- device for discharging；3- cyclone dust collectors；4- bag filter；5- tail gas air-introduced machine；6- is defeated
Send device；7- drawing-in device；8- rotary kiln；9- heating plant；10- matches Wen Fengji；11- combustion fan；12- regulating device；13-
Cooling device；14- cooling blower；15- outlet valve.
Specific embodiment
To further illustrate the technical scheme of the present invention below with reference to the accompanying drawings and specific embodiments.
In one group of specific embodiment, the present invention provides a kind of kaolin powder pre-heating system as shown in Figure 1, institutes
The kaolin powder pre-heating system stated includes by the sequentially connected feed unit of smoke-exhaust pipeline and dust removing units, the dedusting list
Member includes sequentially connected cyclone dust collectors 3 and bag filter 4 according to the flow direction of material of kaolin powder.
Conveying device 6 is provided with below the discharge port of dust removing units, the conveying device 6 is for after accepting and transmitting preheating
Kaolin powder.Feed inlet, discharge port and gas outlet are provided on the shell of the cyclone dust collectors 3, bag filter 4
Feed inlet, discharge port and gas outlet are provided on shell.Under the discharge port of cyclone dust collectors 3 and the discharge port of bag filter 4
Side is provided with conveying device 6, and conveying device 6 is screw conveyor, the outlet of the feed inlet connection smoke-exhaust pipeline of cyclone dust collectors 3
End, the feed inlet of the gas outlet connection bag filter 4 of cyclone dust collectors 3, the gas outlet of bag filter 4 connects tail gas air inducing
Machine 5.
Feed unit includes the storage bin 1 and device for discharging 2 of connection, and device for discharging 2 is Star-like unloader, the smoke exhaust pipe
Road is provided with feed inlet, the feed inlet of the discharge port connection smoke-exhaust pipeline of device for discharging 2.
In addition, the present invention also provides a kind of kaolin powder pre-heating mean, the pre-heating mean specifically includes as follows
Step:
Kaolin original powder in storage bin 1 is sent into smoke-exhaust pipeline through device for discharging 2, the high temperature cigarette generated with rotary kiln 8
Gas contact, the kaolin after being fully warmed-up go out to fall into conveying device 6 via cyclone dust collectors 3 and 4 dedusting heel row of bag filter,
Flue gas is emptied via tail gas air-introduced machine 5 after preheating.
The temperature of high-temperature flue gas is 350~400 DEG C, and the kaolin powder temperature being discharged after 3 dedusting of cyclone dust collectors is 300
~350 DEG C, the kaolin powder temperature being discharged after 4 dedusting of bag filter is 60~90 DEG C, pre- by kaolin powder
The temperature of kaolin powder after hot systems preheating is 270~320 DEG C, and the emptying temperature of flue gas is 250~300 DEG C after preheating.
In another group of specific embodiment, the present invention provides a kind of kaolin powder calcination system, the kaolinites
Native powder calcination system is as shown in Fig. 2, include sequentially connected preheating unit, calcining unit and cooling unit.The preheating is single
The kaolin powder pre-heating system that member is provided using first group of specific embodiment, the smoke-exhaust pipeline input end of the preheating unit
The exhanst gas outlet of connection calcining unit.
Calcining unit includes sequentially connected calciner plant and heating plant 9, and calciner plant is rotary kiln 8, and rotary kiln 8 leans on
One end of nearly preheating unit is provided with exhanst gas outlet, and exhanst gas outlet connects the input end of smoke-exhaust pipeline.Rotary kiln 8 is single close to preheating
The side of member is additionally provided with feed component, and feed component includes the constant-current stabilizer and drawing-in device 7 of connection, and constant-current stabilizer is for holding
It connects conveying device 6 and transmits the flow of kaolin powder and stable kaolin powder after the preheating come, drawing-in device 7 is for controlling height
The calcining inlet amount of ridge soil powder.Rotary kiln 8 is provided with discharge port and heating plant 9, the confession far from the side of preheating unit
Thermal 9 is used to provide calcining required temperature into rotary kiln 8, and the heating plant 9 is fuel gas hot-blast stove, the gas hot-air
The air inlet of furnace is separately connected with warm blower 10 and combustion fan 11.
Cooling unit includes cooling device 13, and cooling device 13 is single cylinder cooling machine.One end of single cylinder cooling machine is provided with
Feed inlet, the other end are provided with air inlet and discharge port, and feed inlet connects the discharge port of rotary kiln 8, and air inlet connects cooling wind
Machine 14, the road of discharge nozzle locating for discharge port are provided with outlet valve 15, and outlet valve 15 is double flap valves, the charging of single cylinder cooling machine
Mouthful be provided with regulating device 12 on the connecting line of 8 discharge port of rotary kiln, regulating device 12 is gas material channel adjuster.It is cooling
Cooling medium spray equipment is additionally provided with above device 13.
In addition, the present invention also provides a kind of kaolin powder method for calcinating, the method for calcinating specifically includes as follows
Step:
(I) preheat: the kaolin original powder in storage bin 1 is sent into smoke-exhaust pipeline through device for discharging 2, is generated with rotary kiln 8
High-temperature flue gas contact, kaolin after being fully warmed-up goes out to fall into defeated via cyclone dust collectors 3 and 4 dedusting heel row of bag filter
Device 6 is sent, flue gas is emptied via tail gas air-introduced machine 5 after preheating；
(II) calcine: the kaolin powder after preheating is sent into constant-current stabilizer by conveying device 6, passes through drawing-in device after current stabilization
7 are delivered in calciner plant and carry out high-temperature calcination, and heating plant 9 provides calcining required temperature into calciner plant；
(III) cooling: the kaolin powder after high-temperature calcination is sent into cooling device 13 by regulating device 12, in cooling
The kaolin powder after high-temperature calcination is cooled down under the action of blower 14 and cooling medium spray equipment to obtain calcining kaolinite
Soil；
Wherein, the temperature of high-temperature flue gas described in step (I) is 550~900 DEG C, is discharged after 3 dedusting of cyclone dust collectors
Kaolin powder temperature is 300~350 DEG C, and the kaolin powder temperature being discharged after 4 dedusting of bag filter is 60~90 DEG C, in advance
The emptying temperature of flue gas is 250~300 DEG C after heat；The temperature of kaolin powder after step (II) described preheating is 270~320
DEG C, calcining required temperature is 900~1350 DEG C.
Embodiment 1
A kind of kaolin powder method for calcinating is present embodiments provided, system is calcined using kaolin powder as shown in Figure 2
System carries out high-temperature calcination to 325 mesh kaolin original powders, and the method for calcinating specifically comprises the following steps:
(I) preheat: 325 mesh kaolin original powders in storage bin 1 are sent into smoke-exhaust pipeline through device for discharging 2, with rotary kiln 8
The 550 DEG C of high-temperature flue gas generated contact, after the kaolin after being fully warmed-up is via 4 dedusting of cyclone dust collectors 3 and bag filter
Discharge falls into conveying device 6, and the kaolin powder temperature being discharged after 3 dedusting of cyclone dust collectors is 300 DEG C, and bag filter 4 removes
The kaolin powder temperature being discharged after dirt is 60 DEG C, and the flue gas cool-down after preheating is emptied to 250 DEG C via tail gas air-introduced machine 5；
(II) calcine: the kaolin powder of above two different temperatures is sent into constant-current stabilizer by conveying device 6, is preheated to
270 DEG C of kaolin powder is delivered to 900 DEG C of high-temperature calcinations of progress, heat supply in calciner plant by drawing-in device 7 after current stabilization
Device 9 provides calcining required temperature into calciner plant；
(III) cooling: the kaolin powder after high-temperature calcination is sent into cooling device 13 by regulating device 12, in cooling
The kaolin powder after high-temperature calcination is cooled down under the action of blower 14 and cooling medium spray equipment to obtain calcining kaolinite
Native finished product.
Kaolin powder sample and finished product materials sample after not preheating kaolin original powder sample, preheating are taken, is detected respectively
Its loss on ignition, the results are shown in Table 1.
Embodiment 2
A kind of kaolin powder method for calcinating is present embodiments provided, system is calcined using kaolin powder as shown in Figure 2
System carries out high-temperature calcination to 325 mesh kaolin original powders, and the method for calcinating specifically comprises the following steps:
(I) preheat: 325 mesh kaolin original powders in storage bin 1 are sent into smoke-exhaust pipeline through device for discharging 2, with rotary kiln 8
The 700 DEG C of high-temperature flue gas generated contact, after the kaolin after being fully warmed-up is via 4 dedusting of cyclone dust collectors 3 and bag filter
Discharge falls into conveying device 6, and the kaolin powder temperature being discharged after 3 dedusting of cyclone dust collectors is 320 DEG C, and bag filter 4 removes
The kaolin powder temperature being discharged after dirt is 70 DEG C, and the flue gas cool-down after preheating is emptied to 260 DEG C via tail gas air-introduced machine 5；
(II) calcine: the kaolin powder of above two different temperatures is sent into constant-current stabilizer by conveying device 6, is preheated to
290 DEG C of kaolin powder is delivered to 1000 DEG C of high-temperature calcinations of progress, heat supply in calciner plant by drawing-in device 7 after current stabilization
Device 9 provides calcining required temperature into calciner plant；
(III) cooling: the kaolin powder after high-temperature calcination is sent into cooling device 13 by regulating device 12, in cooling
The kaolin powder after high-temperature calcination is cooled down under the action of blower 14 and cooling medium spray equipment to obtain calcining kaolinite
Native finished product.
Kaolin powder sample and finished product materials sample after not preheating kaolin original powder sample, preheating are taken, is detected respectively
Its loss on ignition, the results are shown in Table 1.
Embodiment 3
A kind of kaolin powder method for calcinating is present embodiments provided, system is calcined using kaolin powder as shown in Figure 2
System carries out high-temperature calcination to 325 mesh kaolin original powders, and the method for calcinating specifically comprises the following steps:
A kind of kaolin powder method for calcinating is present embodiments provided, system is calcined using kaolin powder as shown in Figure 2
System carries out high-temperature calcination to 325 mesh kaolin original powders, and the method for calcinating specifically comprises the following steps:
(I) preheat: 325 mesh kaolin original powders in storage bin 1 are sent into smoke-exhaust pipeline through device for discharging 2, with rotary kiln 8
The 800 DEG C of high-temperature flue gas generated contact, after the kaolin after being fully warmed-up is via 4 dedusting of cyclone dust collectors 3 and bag filter
Discharge falls into conveying device 6, and the kaolin powder temperature being discharged after 3 dedusting of cyclone dust collectors is 330 DEG C, and bag filter 4 removes
The kaolin powder temperature being discharged after dirt is 80 DEG C, and the flue gas cool-down after preheating is emptied to 280 DEG C via tail gas air-introduced machine 5；
(II) calcine: the kaolin powder of above two different temperatures is sent into constant-current stabilizer by conveying device 6, is preheated to
300 DEG C of kaolin powder is delivered to 1200 DEG C of high-temperature calcinations of progress, heat supply in calciner plant by drawing-in device 7 after current stabilization
Device 9 provides calcining required temperature into calciner plant；
(III) cooling: the kaolin powder after high-temperature calcination is sent into cooling device 13 by regulating device 12, in cooling
The kaolin powder after high-temperature calcination is cooled down under the action of blower 14 and cooling medium spray equipment to obtain calcining kaolinite
Native finished product.
Kaolin powder sample and finished product materials sample after not preheating kaolin original powder sample, preheating are taken, is detected respectively
Its loss on ignition, the results are shown in Table 1.
Embodiment 4
A kind of kaolin powder method for calcinating is present embodiments provided, system is calcined using kaolin powder as shown in Figure 2
System carries out high-temperature calcination to 325 mesh kaolin original powders, and the method for calcinating specifically comprises the following steps:
(I) preheat: 325 mesh kaolin original powders in storage bin 1 are sent into smoke-exhaust pipeline through device for discharging 2, with rotary kiln 8
The 900 DEG C of high-temperature flue gas generated contact, after the kaolin after being fully warmed-up is via 4 dedusting of cyclone dust collectors 3 and bag filter
Discharge falls into conveying device 6, and the kaolin powder temperature being discharged after 3 dedusting of cyclone dust collectors is 350 DEG C, and bag filter 4 removes
The kaolin powder temperature being discharged after dirt is 90 DEG C, and the flue gas cool-down after preheating is emptied to 300 DEG C via tail gas air-introduced machine 5；
(II) calcine: the kaolin powder of above two different temperatures is sent into constant-current stabilizer by conveying device 6, is preheated to
320 DEG C of kaolin powder is delivered to 1350 DEG C of high-temperature calcinations of progress, heat supply in calciner plant by drawing-in device 7 after current stabilization
Device 9 provides calcining required temperature into calciner plant；
(III) cooling: the kaolin powder after high-temperature calcination is sent into cooling device 13 by regulating device 12, in cooling
The kaolin powder after high-temperature calcination is cooled down under the action of blower 14 and cooling medium spray equipment to obtain calcining kaolinite
Native finished product.
Kaolin powder sample and finished product materials sample after not preheating kaolin original powder sample, preheating are taken, is detected respectively
Its loss on ignition, the results are shown in Table 1.
Table 1
| Original powder is not preheated | Powder after preheating | Finished product materials | Kaolin theoretical value | |
| Embodiment 1 | 15.46 | 3.59 | 0.07 | 13.96 |
| Embodiment 2 | 16.87 | 4.63 | 0.05 | 13.96 |
| Embodiment 3 | 17.86 | 4.87 | 0.10 | 13.96 |
| Embodiment 4 | 20.18 | 5.86 | 0.12 | 13.96 |
Application Example
325 mesh kaolin are calcined using kaolin powder calcination system provided by the invention, the calciner
Skill has been successfully applied in the transformation of Shandong and Shanxi production line, and Shandong production line uses Shuozhou area Huiyuan mine as original
Material, Shandong production line use Shuozhou area Huiyuan mine as raw material, and Shanxi production line directly uses locality Baode mine as raw material,
Two kinds of original ore properties are as shown in table 2.
Table 2
| SiO2[%] | Al2O3[%] | Fe2O3[%] | TiO2[%] | LOI [%] | |
| Hun Yuankuang | 45.59 | 38.20 | 0.24 | 0.57 | 15.28 |
| Baode mine | 40.54 | 37.25 | 0.23 | 0.78 | 21.54 |
The major parameter in Shandong, Shanxi production line capital equipment and production line debugging is as shown in table 3.
Table 3
The kaolin powder material after preheating is detected according to live thermocouple and temperature-measuring gun, material preheating temperature
It can be high after Commissioning field takes and do not preheat kaolin original powder sample, preheating to 270~320 DEG C, to further appreciate that pre-heat effect
Ridge soil powder sample and finished product materials sample, detect its loss on ignition and angle of repose respectively, the results are shown in Table 4.
Table 4
| Original powder is not preheated | Powder after preheating | Finished product materials | Kaolin theoretical value | |
| Loss on ignition/% | 15.03 | 3.86 | 0.08 | 13.96 |
| Angle of repose/° | 43 | 32 | —— | —— |
As can be seen from Table 4, not preheated original powder (Hun Yuankuang), which is burnt, loses 15.03%, a little higher than kaolin theoretical value
13.96%, after the preheating of 46m smoke-exhaust pipeline (preheating time 2-3s), burns mistake and be reduced to 3.86%, illustrate in warm,
Kaolin powder is stripped of most of crystallization water, and the removing crystallization water is a large amount of endothermic reactions, exhaust gas temperature can be greatly reduced, simultaneously
Increase rotary kiln yield.Powder has removed most of crystallization water after preheating, and mobility is significantly increased, can be intuitively anti-from angle of repose
It answers, does not preheat 43 ° of original powder angle of repose, preheated rear powder angle of repose is reduced to 32 °.To not preheating kaolin original powder sample, pre-
The apparent colour of kaolin powder sample and finished product materials sample compares discovery after heat, does not preheat kaolin original powder sample
In black gray expandable, kaolin powder sample gray after preheating, finished product materials sample is white, has proved new process from the appearance
Pre-heat effect.
The kiln type limitation of calcine technology and calcination system rotary kiln provided by the invention is smaller, and volume production is also apparently higher than
Industry mainstream, is in particular in:
(1) raw ore low for loss on ignition, by taking the mine of Huiyuan as an example, mainstream volume production is 19-20kg/ in industry at present
m3H, after calcination system provided by the invention, even the kiln type of this draw ratio very little of 2.8 × 37m of Φ, can forge
Qualified products are burnt, and volume production reaches 22.8kg/m3H promotes amplitude 10% or more.
(2) for fire loss volume raw ore, by taking Baode mine as an example, because loss on ignition is big and carbon content is high, it is not used to 325 always
The kaolinic calcining of mesh is only applicable to low granularity product calcining (more than 1250 mesh), and yield is extremely low, to the length of rotary kiln
It requires, it is general to require in 56m or more.After calcination system provided by the invention, by taking the production line of Shanxi as an example, utilize
48m length rotary kiln successfully calcines out 325 qualified mesh products, and volume production can also reach 14.2kg/m3。
In addition, there is also clear superiorities in terms of calcining unit consumption for calcination system provided by the invention, 325 mesh kaolinites are calcined
Soil, for low loss on ignition raw ore, calcining unit consumption is generally 950-1000kcal/kg product in industry, is mentioned using the present invention
The calcination system of confession, according to Shandong production line scheduling and planning, the result of actual measurement shows that, calcining unit consumption is 824kcal/kg product,
15% or more energy conservation.
The Applicant declares that the foregoing is merely a specific embodiment of the invention, but protection scope of the present invention not office
It is limited to this, it should be clear to those skilled in the art, any to belong to those skilled in the art and take off in the present invention
In the technical scope of dew, any changes or substitutions that can be easily thought of, and all of which fall within the scope of protection and disclosure of the present invention.
Claims (10)
1. a kind of kaolin powder pre-heating system, which is characterized in that the kaolin powder pre-heating system includes passing through smoke evacuation
The sequentially connected feed unit of pipeline and dust removing units；
The dust removing units include sequentially connected cyclone dust collectors and bag filter according to the flow direction of material of kaolin powder.
2. kaolin powder pre-heating system according to claim 1, which is characterized in that under the discharge port of the dust removing units
Side is provided with conveying device, and the conveying device is used to accepting and transmitting the kaolin powder after preheating；
Preferably, feed inlet, discharge port and gas outlet are provided on the shell of the cyclone dust collectors；
Preferably, feed inlet, discharge port and gas outlet are provided on the shell of the bag filter；
Preferably, conveying device is provided with below the discharge port of the discharge port of the cyclone dust collectors and bag filter；
Preferably, the feed inlet of the cyclone dust collectors connects the outlet end of the smoke-exhaust pipeline；
Preferably, the gas outlet of the cyclone dust collectors connects the feed inlet of the bag filter；
Preferably, the gas outlet of the bag filter connects tail gas air-introduced machine；
Preferably, the cyclone dust collectors are four cyclone dust collectors；
Preferably, the conveying device is screw conveyor.
3. kaolin powder pre-heating system according to claim 1 or 2, which is characterized in that the feed unit includes
The storage bin and device for discharging of connection；
Preferably, feed inlet, the charging of the discharge port connection smoke-exhaust pipeline of the device for discharging are provided on the smoke-exhaust pipeline
Mouthful；
Preferably, the device for discharging is Star-like unloader.
4. a kind of kaolin powder pre-heating mean, which is characterized in that use the described in any item kaolin powders of claim 1-3
Pre-heating system preheats kaolin original powder；
The pre-heating mean includes: that kaolin original powder is delivered in smoke-exhaust pipeline by feed unit, is generated with rotary kiln
High-temperature flue gas contact, after being fully warmed-up, via being discharged after cyclone dust collectors and bag filter dedusting.
5. kaolin powder pre-heating mean according to claim 4, which is characterized in that the pre-heating mean includes: storage
Kaolin original powder in feed bin is sent into smoke-exhaust pipeline through device for discharging, and the high-temperature flue gas generated with rotary kiln contacts, sufficiently pre-
Kaolin after heat goes out to fall into conveying device via cyclone dust collectors and bag filter dedusting heel row, and flue gas is via tail after preheating
The emptying of gas air-introduced machine；
Preferably, the temperature of the high-temperature flue gas is 550~900 DEG C；
Preferably, the kaolin powder temperature being discharged after the cyclone dust collectors dedusting is 300~350 DEG C；
Preferably, the kaolin powder temperature being discharged after the bag filter dedusting is 60~90 DEG C；
Preferably, the temperature of the kaolin powder after kaolin powder pre-heating system preheating is 270~320 DEG C；
Preferably, the emptying temperature of flue gas is 250~300 DEG C after the preheating.
6. a kind of kaolin powder calcination system, which is characterized in that the kaolin powder calcination system includes being sequentially connected
Preheating unit, calcining unit and cooling unit；
The preheating unit uses the described in any item kaolin powder pre-heating systems of claim 1-3；
The exhanst gas outlet of the smoke-exhaust pipeline input end connection calcining unit of the preheating unit.
7. kaolin powder calcination system according to claim 6, which is characterized in that the calcining unit includes successively
The calciner plant and heating plant of connection；
Preferably, the calciner plant is rotary kiln；
Preferably, the rotary kiln is provided with exhanst gas outlet close to one end of preheating unit, and the exhanst gas outlet connects the row
The input end on smoke pipe road；
Preferably, the rotary kiln is additionally provided with feed component close to the side of preheating unit；
Preferably, the feed component includes the constant-current stabilizer and drawing-in device of connection, and the constant-current stabilizer is for accepting conveying
The flow of kaolin powder and stable kaolin powder after the preheating that device transmission comes, the drawing-in device is for controlling kaolin
The calcining inlet amount of powder；
Preferably, the rotary kiln is provided with discharge port far from the side of preheating unit；
Preferably, the rotary kiln is additionally provided with heating plant far from the side of preheating unit, and the heating plant is used for returning
Calcining required temperature is provided in rotary kiln；
Preferably, the heating plant is fuel gas hot-blast stove；
Preferably, the air inlet of the fuel gas hot-blast stove is separately connected with warm blower and combustion fan.
8. kaolin powder calcination system according to claim 6 or 7, which is characterized in that the cooling unit includes
Cooling device；
Preferably, the cooling device is single cylinder cooling machine；
Preferably, one end of the single cylinder cooling machine is provided with feed inlet, and the other end is provided with air inlet and discharge port, it is described into
Material mouth connects the discharge port of rotary kiln, and the air inlet connects cooling blower, and the road of discharge nozzle locating for the discharge port is arranged
There is outlet valve；
Preferably, adjusting dress is provided on the connecting line of the feed inlet of the single cylinder cooling machine and the rotary kiln discharge port
It sets；
Preferably, the regulating device is gas material channel adjuster；
Preferably, the outlet valve is double flap valves；
Preferably, cooling medium spray equipment is additionally provided with above the cooling device.
9. a kind of kaolin powder method for calcinating, which is characterized in that use the described in any item kaolin powders of claim 6-8
Calcination system calcines kaolin original powder, and the method for calcinating includes:
Feeding calcining unit, is sent into cooling after high-temperature calcination after kaolin original powder is preheated to 270~320 DEG C by preheating unit
Unit cooling obtains calcined kaolin.
10. kaolin powder method for calcinating according to claim 9, which is characterized in that the method for calcinating includes:
(I) preheat: the kaolin original powder in storage bin is sent into smoke-exhaust pipeline through device for discharging, the high temperature cigarette generated with rotary kiln
Gas contact, the kaolin after being fully warmed-up go out to fall into conveying device via cyclone dust collectors and bag filter dedusting heel row, in advance
Flue gas is emptied via tail gas air-introduced machine after heat；
(II) calcine: the kaolin powder after preheating is sent into constant-current stabilizer by conveying device, is conveyed after current stabilization by drawing-in device
High-temperature calcination is carried out into calciner plant, heating plant provides calcining required temperature into calciner plant；
(III) cooling: kaolin powder after high-temperature calcination is by regulating device feeding cooling device, in cooling blower and cold
But the kaolin powder after high-temperature calcination is cooled down to obtain calcined kaolin under the action of medium spray equipment；
Preferably, the temperature of high-temperature flue gas described in step (I) is 550~900 DEG C；
Preferably, the kaolin powder temperature being discharged after cyclone dust collectors dedusting described in step (I) is 300~350 DEG C；
Preferably, the kaolin powder temperature being discharged after bag filter dedusting described in step (I) is 60~90 DEG C；
Preferably, the emptying temperature of flue gas is 250~300 DEG C after preheating described in step (I)；
Preferably, the temperature of the kaolin powder after step (II) described preheating is 270~320 DEG C；
Preferably, step (II) the calcining required temperature is 900~1350 DEG C, it is further preferred that temperature needed for the calcining
Degree is 1250~1300 DEG C.
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| CN112939002A (en) * | 2021-01-28 | 2021-06-11 | 天津水泥工业设计研究院有限公司 | Flexibly-adjustable high-activity metakaolin preparation system and preparation method |
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Application publication date: 20190910 |