CN101445248A - Fluidized calcining technology of high-activity metakaolin - Google Patents
Fluidized calcining technology of high-activity metakaolin Download PDFInfo
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- CN101445248A CN101445248A CNA2008101879650A CN200810187965A CN101445248A CN 101445248 A CN101445248 A CN 101445248A CN A2008101879650 A CNA2008101879650 A CN A2008101879650A CN 200810187965 A CN200810187965 A CN 200810187965A CN 101445248 A CN101445248 A CN 101445248A
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Abstract
The invention provides a fluidized calcining technology of high-activity metakaolin. The problems of unstable product quality, high energy consumption, huge investment and high production cost exist in the existing calcining technology. The calcining technology provided in the invention comprises a device system consisting of a counterflow fluidized calcining furnace, a raw-material preheat and afterheat utilization system, a wrought material cooling system and an air heating furnace system. Powered material of kaolin is fed in the furnace from the peak of the calcining furnace through a spreading machine after being preheated; and hot smoke gas produced by the air heating furnace enters the bottom of the calcining furnace and upwardly flows at a speed of 1-2.5m/s so that crystal water is quickly dewatered at a temperature of 560 DEG C to 750 DEG C when the materials and the host smoke gas are in the state of counterflow, thereby forming the high-activity metakaolin. The absorption value of Ca(OH)2 of finished products in the invention can reach 1000mg/g or more and the screen analysis D50 can reach about 2 microns; and the technology has the beneficial effects of stable quality, energy saving, low production cost and less investment.
Description
Technical field
The present invention relates to the method for calcinating of material, particularly the calcining process of silicate compound.
Background technology
Metakaolin is the amorphous anhydrous aluminium silicate that forms after kaolin dewaters under proper temperature.Heat-treat between 600-850 ℃ when kaolin, be present in the OH between silicon-oxy tetrahedron and alumina octahedral structural sheet in the kaolin
-Base is sloughed, this OH that only sloughs
-The kaolin of base, though still can keep original laminate structure, bigger dislocation has taken place in its interatomic arrangement, having formed with amorphous transition phase is the material of feature, promptly calls metakaolin.This metakaolin is the thermodynamics steady state that is situated between, and therefore has high reaction activity and high.In recent years, active day by day to the research of metakaolin characteristic and application in the world, in view of its calcining temperature lower, CO
2Discharge lessly, generally believe, metakaolin, particularly accurately machined have a highly active metakaolin, is expected to become the green novel material that has DEVELOPMENT PROSPECT in a plurality of industries.As be used to make inorganic polymer-ground polymers cement with three-dimensional network-like structure; Be used for high-strength high-performance concrete and make mineral additive; Be used to make the 4A zeolite, be used for consolidating heavy metal and nuke rubbish etc.
The reactive behavior of metakaolin is not only relevant with the virgin state of ore, and main is relevant with calcining process and calcining temperature.Temperature is on the low side, or too short in the following residence time of decomposition temperature, decomposes not exclusively, and is active on the low side; Temperature drift, or under decomposition temperature overstand, amorphous degree reduces, activity is also along with reduction.At present, be accustomed to adopting the technical indicator of following two requirements in the world as high-activity metakaolin:
(1), every gram metakaolin absorbs Ca (OH)
2Amount should be greater than 1000mg.
(2), the distribution of particle sizes of metakaolin: D
50Be about 2 μ m.
The existing calcining technology of metakaolin has the static calcining of fixed-bed type, as down-draft kiln, shuttle kiln, tunnel furnace, shaft furnace etc., the temperature field of these traditional kilns is inhomogeneous, pellet, material base, material piece internal and external reasons conducts heat bad and has tangible temperature head, cause unstable product quality, inaccessible high-activity metakaolin index.Another kind of calcining technology is the calcined by rotary kiln technology, the kaolin powder is fed in direct-fired or internal combustion type or the flame-insulating type rotary kiln, carry out the rolling type calcining, this calcining manners has very much progress than fixed-bed type, rate of heat transfer obviously improves, quality product can reach the high reactivity level, but still existence is poor because of the gas-solid contact, the problem of unstable product quality.On the other hand, kiln process also exists heat energy utilization insufficient, energy consumption height, production cost height; Shortcomings such as specific investment is big.
The comparatively advanced method of calcining pulverulent material is a fluidizing calcination, but does not find as yet so far to be specifically designed to the calcining metakaolin, particularly calcines the report of the fluidizing calcination method of high-activity metakaolin.
Be used for the calcined kaolin of coating such as the filler of plastics, rubber, papermaking etc. and papermaking, building, automobile, the multinomial patent of invention that relates to fluidizing calcination has been arranged.Raw material roasting assembly described in the ZL03154421.5 " the Rapid Cycle fluidizing calcination method and apparatus of ultrafine kaolin " has used circulating fluidized bed calcinator, material is under the situation of limit circulation limit discharging, the old and new's material mixes, be difficult to evenly control the residence time of material in stove, therefore, for requiring product to have for the highly active metakaolin, difficult quality reaches and stablizes; Application number is in 200510004574.7 " fast fluidized calcining process " above-mentioned circulating fluidized bed calcinator to be improved, and has used blaze insulating fluidized forge furnace and flame-proof moving bed calcination device two cover facilities, and technology is too complicated, and investment is big.ZL200610153358.3 " technique of fluidized instant calcinations of kaolin in coal series " the middle pipeline fluidizing calcination technology that adopted, flue-gas temperature 850-1000 ℃, flow velocity is 15-40m/s, too high temperature and too fast speed are difficult to satisfy the calcining requirement of high-activity metakaolin, in addition, heat recuperation to tail gas in this technology is perfect inadequately, has only used the one-level cyclone preheater, and thermosteresis can be bigger.
Summary of the invention
Purpose of the present invention is stablized fluidized calcining technology and equipment good, energy-conservation, the simple high-activity metakaolin of equipment for a kind of suitable quality of production is provided.
The technical scheme that realizes the foregoing invention purpose is as follows:
Kaolinic fluidized calcining technology, this technology comprises the kaolin powder material preheating as raw material, the cooling of mature calcined material and grog, raw material through preheating feed the stove by the top of spreading device from calcining furnace, the hot flue gas that is produced by hotblast stove enters from the below of calcining furnace, flue-gas temperature is 800-1000 ℃, the speed of flue gas in stove is the 1-2.5 meter per second, heat and mass transfer takes place in material and hot flue gas under the adverse current state, when the kaolin powder temperature reaches 560-750 ℃, slough crystal water rapidly, formation is as the high-activity metakaolin of grog, and grog draws off from furnace bottom, enters the water cooler cooling.
The fineness of powder material is the 180-320 order on the high mountain range.
Carry out preheating in preheating that the preheating of raw material is made up of two one-level cyclone preheaters and secondary cyclone preheater and the bootstrap system.
The grog cooling is cooled off in the cooling system of composition by the spiral conveyer of one-level cooling cyclone and band water jacket.
Below the technical program is described further.
(1), reverse-flow fluidized calcinator, providing hot flue gas through mixing section temperature to be transferred to 800-1000 ℃ by hotblast stove, enter in the stove from the calcining furnace bottom, is the 180-320 order through the powdery kaolin fineness of secondary cyclone preheater preheating, enter in the stove by the top of spreading device from calcining furnace, the hot flue gas adverse current of material and rising meets, and heats up rapidly, reaches 560-750 ℃, finish the dehydration back and arrive the stove bottom, enter water cooler by dumper.Whether the activity index of kaolinic degree of dehydration and metakaolin meets the requirements, and can control by sectional wind velocity and the hot stream temperature regulated in the calcining furnace.Sectional wind velocity is the 1-2.5 meter per second, because wind speed is lower, flue gas and material are again countercurrent movements, therefore relatively is fit to the dehydration and the activation treatment of metakaolin.
(2), the preheating of raw material and the bootstrap system of flue gas, form by two one-level whirlwind tubes and a secondary whirlwind tube, and directly and reverse-flow calcining furnace join, on the one hand, can reach the dual purpose of heating raw material and UTILIZATION OF VESIDUAL HEAT IN, on the other hand, the raw material through heating enter calcining furnace, help kaolin and better finish dehydration in calcining furnace, facts have proved, the quality of metakaolin is improved have material impact.
(3), the cooling system of grog also has sensible heat recovery effect, the clinker temperature that goes out calcining furnace is generally 400-500 ℃, logical charge tube enters cooling cyclone, with the rapid heat exchange of the fresh air that enters water cooler, the combustion air that heated air acts as a fuel enters burner, and the grog that is cooled, logical charge tube enter the spiral conveyer warehouse-in of band water jacket.
(4), providing the fuel of hot blast to hotblast stove and temperature adjustment mixing section can be geseous fuel, as Sweet natural gas, and liquefied gas, producer gas etc.; It also can be liquid fuel; Can be solid fuel also, as coal dust, particulate coal etc.Fuel is by burner and make combustion air by the hot blast that cooling cyclone provides and produce burning, forms hot gas flow, and enters the mixing section that the cold wind variable valve is housed and adjust temperature and send into calcining furnace then to 800-1000 ℃.
The present invention compares with traditional technology and has the following advantages:
1, can obtain high-quality high-activity metakaolin, its Ca (OH)
2Absorption value is more than 1000mg/; Size distribution D
50About 2 μ m.And product quality stability is good.
2, energy-saving effect is obvious, and with the metakaolin grog of explained hereafter of the present invention, unit consumption of energy is about 400-500kcal/kg, and the unit consumption of energy of internal combustion type rotary kiln, generally more than 1000kcal/kg.
3, processing unit is simple, saves investment, is convenient to enlarge scale production.
Description of drawings
Fig. 1 is a high-activity metakaolin fluidized calcining technology synoptic diagram.
The name of each sequence number is called among the figure:
1-raw material pipe, 2-one-level preheater, 3-secondary preheater, 4-are expected pipe, 5-1,5-2-airduct, 6-spreading device, the reverse-flow calcining furnace of 7-, 8-grog pipe, the 9-exhaust duct, 10-dust-precipitator, 11-exhaust blower, 12-dust, the 13-combustion chamber, 14-burner, 15-cold wind mouth, the 16-air lift mud pump, 17-cooling cyclone, 18-combustion air, the 19-induced draft fan, 20-worm conveyor, 21-clinker warehouse → logistics direction
The kaolin powder material by air lift mud pump, enters the regenerator section of fluidization calcining system by tremie pipe 1, immediately by The hot waste gas that secondary preheater 3 is discharged is brought in two one-level preheaters 2 and is carried out heat exchange, through the thing of one-level preheater preheating Material, logical charge tube 4 enter in the hot waste gas pipe 5 of being discharged by reverse-flow calcining furnace 7, and enter rapidly in the secondary preheater 3 The row secondary preheating, the material that again is preheated enters reverse-flow calcining furnace 7 by dispersion device 6 and calcines. Fuel is by combustion Burn device 14, burning produces thermal current in combustion chamber 13, and carries out temperature adjustment by cold wind mouth 15, combustion air 18 be by Cooling cyclone 17, air-introduced machine 19, the grog that calcining furnace is discharged by material pipe 8 and 16 enter carry out heat exchange in the cooler and Obtain. Through the material of cooling, carry warehouse-in by the conveying worm 20 with water cold sleeve again. The fluidization of whole system is all by row Blower fan 11 drives, and system's mode of operation is negative pressure, and hot flue gas enters reverse-flow calcining furnace by hot-blast stove, finish the calcining task after, Tail gas enters secondary whirlwind preheater by airduct 5-1, divides two the tunnel to enter respectively the preheating of two one-level whirlwind by airduct 5-2 again Device, finish the preheating to raw material after, enter dust-precipitator 10 by exhaust duct 9, enter atmosphere by exhaust blower at last, by gathering dust The dust that device is accepted is sent raw material storage to and is still done the raw material use.
Specific embodiment
Embodiment 1, adopt 180 purpose kaolin powder material, be pumped in the technical process as Fig. 1, when the hot flue-gas temperature of hotblast stove output is 800 ℃ with airlift, the cross-sectional flow of reverse-flow calcining furnace is 1 meter per second, and the metakaolin performance that obtains is: distribution of particle sizes D behind the grinding
50=1,89 μ m, Ca (OH)
2Absorption value 1280mg/g.
Embodiment 2, adopt 320 purpose kaolin powder material, be pumped in the technical process as Fig. 1,1000 ℃ of the hot flue-gas temperatures of hotblast stove output with airlift, the cross-sectional flow of reverse-flow calcining furnace is 2.5 meter per seconds, and the metakaolin performance that obtains is: distribution of particle sizes D behind the grinding
50=2.36 μ m, Ca (OH)
2Absorption value 1250mg/g.
Embodiment 3, adopt 320 purpose kaolin powder material, be pumped in the technical process as Fig. 1,950 ℃ of the hot flue-gas temperatures of hotblast stove output with airlift, the cross-sectional flow of reverse-flow calcining furnace is 2.0 meter per seconds, and the metakaolin performance that obtains is: distribution of particle sizes D behind the grinding
50=2.03 μ m, Ca (OH)
2Absorption value 1325mg/g.
Claims (4)
1, the fluidized calcining technology of high-activity metakaolin, this technology comprises the kaolin powder material preheating as raw material, the cooling of mature calcined material and grog, it is characterized in that feeding the stove by the top of spreading device from calcining furnace through the raw material of preheating, the hot flue gas that is produced by hotblast stove enters from the below of calcining furnace, flue-gas temperature is 800-1000 ℃, the speed of flue gas in stove is the 1-2.5 meter per second, heat and mass transfer takes place in material and hot flue gas under the adverse current state, when the kaolin powder temperature reaches 560-750 ℃, slough crystal water rapidly, formation is as the high-activity metakaolin of grog, and grog draws off from furnace bottom, enters the water cooler cooling.
2, the fluidized calcining technology of high-activity metakaolin according to claim 1, the fineness that it is characterized in that the kaolin powder material is the 180-320 order.
3, carry out preheating in preheating that the fluidized calcining technology of the described high-activity metakaolin of claim 1, the preheating that it is characterized in that raw material are made up of two one-level cyclone preheaters and secondary cyclone preheater and the bootstrap system.
4, the fluidized calcining technology of high-activity metakaolin according to claim 1 is characterized in that: the grog cooling is cooled off in the cooling system of composition by the spiral conveyer of one-level cooling cyclone and band water jacket.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832712A (en) * | 2010-05-19 | 2010-09-15 | 广东莱雅化工有限公司 | Method and device thereof for calcining minerals by using electric radiation |
| CN102288044A (en) * | 2011-07-22 | 2011-12-21 | 湖南天水蓝能源科技有限公司 | Pipeless heat exchanger and residual-heat recovery system |
| CN104990418A (en) * | 2015-06-13 | 2015-10-21 | 河北瞳鸣环保有限公司 | Hot alkaline recycling device of calcining furnace |
| CN107062902A (en) * | 2017-05-03 | 2017-08-18 | 南京凯盛国际工程有限公司 | A kind of calcination of minerals apparatus and method |
| CN108046750A (en) * | 2017-12-12 | 2018-05-18 | 瑞泰科技股份有限公司 | A kind of preparation method of calcined kaolin superfine powder |
| CN108046282A (en) * | 2017-12-12 | 2018-05-18 | 瑞泰科技股份有限公司 | A kind of method for calcinating of kaolin superfine powder |
| CN108083816A (en) * | 2017-12-12 | 2018-05-29 | 瑞泰科技股份有限公司 | A kind of preparation method of high bauxite clinker powder |
| CN109468136A (en) * | 2018-12-29 | 2019-03-15 | 浙江中地净土科技有限公司 | A kind of stabilizer of heavy metal lead pollution and preparation method thereof |
| CN109485056A (en) * | 2018-12-29 | 2019-03-19 | 中国矿业大学 | A kind of quick decrystallized method of flash heating organic kaolin |
| CN109502596A (en) * | 2018-12-29 | 2019-03-22 | 中国矿业大学 | The method that kaolin prepares metakaolin is forged in a kind of sudden strain of a muscle of prompt drop |
| CN109877144A (en) * | 2019-04-16 | 2019-06-14 | 四川海沛环保科技有限公司 | The cement calcination raw material and its preparation process of a kind of alternative traditional quick lime and application |
| 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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2008
- 2008-12-31 CN CNA2008101879650A patent/CN101445248A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832712A (en) * | 2010-05-19 | 2010-09-15 | 广东莱雅化工有限公司 | Method and device thereof for calcining minerals by using electric radiation |
| CN102288044A (en) * | 2011-07-22 | 2011-12-21 | 湖南天水蓝能源科技有限公司 | Pipeless heat exchanger and residual-heat recovery system |
| CN104990418A (en) * | 2015-06-13 | 2015-10-21 | 河北瞳鸣环保有限公司 | Hot alkaline recycling device of calcining furnace |
| CN107062902A (en) * | 2017-05-03 | 2017-08-18 | 南京凯盛国际工程有限公司 | A kind of calcination of minerals apparatus and method |
| CN108046750A (en) * | 2017-12-12 | 2018-05-18 | 瑞泰科技股份有限公司 | A kind of preparation method of calcined kaolin superfine powder |
| CN108046282A (en) * | 2017-12-12 | 2018-05-18 | 瑞泰科技股份有限公司 | A kind of method for calcinating of kaolin superfine powder |
| CN108083816A (en) * | 2017-12-12 | 2018-05-29 | 瑞泰科技股份有限公司 | A kind of preparation method of high bauxite clinker powder |
| CN109468136A (en) * | 2018-12-29 | 2019-03-15 | 浙江中地净土科技有限公司 | A kind of stabilizer of heavy metal lead pollution and preparation method thereof |
| CN109485056A (en) * | 2018-12-29 | 2019-03-19 | 中国矿业大学 | A kind of quick decrystallized method of flash heating organic kaolin |
| CN109502596A (en) * | 2018-12-29 | 2019-03-22 | 中国矿业大学 | The method that kaolin prepares metakaolin is forged in a kind of sudden strain of a muscle of prompt drop |
| CN109877144A (en) * | 2019-04-16 | 2019-06-14 | 四川海沛环保科技有限公司 | The cement calcination raw material and its preparation process of a kind of alternative traditional quick lime and application |
| 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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