CN100366535C - Method for calcining kaolin by rotary calcining kiln and rotary calcining kiln thereof - Google Patents
Method for calcining kaolin by rotary calcining kiln and rotary calcining kiln thereof Download PDFInfo
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- CN100366535C CN100366535C CNB021594201A CN02159420A CN100366535C CN 100366535 C CN100366535 C CN 100366535C CN B021594201 A CNB021594201 A CN B021594201A CN 02159420 A CN02159420 A CN 02159420A CN 100366535 C CN100366535 C CN 100366535C
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Abstract
A method for calcining kaolin by a rotary calcining kiln and the rotary calcining kiln thereof are characterized in that an internal heating type rotary calcining kiln is adopted for calcining, calcined materials are calcined in calcining areas with different temperatures, the temperature of a material feeding end of the rotary calcining kiln is controlled to be 600 ℃, and the time of the materials passing through the temperature area of 600 ℃ to 950 ℃ for uniform temperature rise in the kiln is controlled to be 70-80 minutes; controlling the material to pass through the temperature range of 950-1030 ℃ in the kiln for 15-25 minutes; the materials are discharged out of the kiln body after passing through the temperature area of 800-850 ℃ for 10-20 minutes. A rotary calcining kiln for calcining kaolin comprises a rotary kiln body, a kiln head box and a kiln tail box. The internal heating type rotary calcining kiln has low manufacturing cost and longer service life. Greatly reduces the investment and production cost of kaolin calcining equipment, and is suitable for large-scale industrial production of calcined kaolin.
Description
Technical field
A kind of with rotary calciner calcined kaolin method and rotary calciner thereof, relate to the high-quality calcined kaolin that a kind of production papermaking, coating and other industry are used, particularly adopt the method and the employed rotary calciner thereof of internal heat type rotary calciner calcined kaolin.
Background technology
Calcined kaolin is an industrial raw material important in the national economy.Major clay minerals in the kaolin is a kaolinite, and kaolinite when calcining is along with following chemical reaction takes place variation of temperature:
400 ℃～900 ℃: Al
2O
32SiO
22H
2O=Al
2O
32SiO
2+ 2H
2O (metakaolinite)
925 ℃～1050 ℃: 2Al
2O
32SiO
2=2Al
2O
33SiO
2(aluminium silicon spinel)+SiO
2(amorphous)
～1100 ℃: 3Al
2O
33SiO
2=2 (Al
2O
3SiO
2) (false mullite)+SiO
2
～1300 ℃: 3 (Al
2O
3SiO
2)=3Al
2O
32SiO
2(mullite)+SiO
2(cristobalite)
Its physicochemical change process is: 100 ℃～110 ℃ machineries are adsorbed on around material surface, the particle or hygroscopic water in the gap and free water eliminating.So low temperature heat absorption paddy when 100 ℃ of left and right sides, can occur.110 ℃～400 ℃ interlayer planar water are got rid of.This part water was mainly deviate from the past at 250 ℃, and its heat absorption paddy is before 250 ℃.400 ℃～450 ℃ water of constitution begin slow discharge.Two hydroxyls this moment (OH) become a water molecules (H
2O), stay next oxygen (O), begin to form metakaolinite.450 ℃～500 ℃ water of constitution are discharged rapidly, strong heat absorption paddy of corresponding appearance.550 ℃～800 ℃ dehydrations slowly.800 ℃～900 ℃ residual water eliminatings finish.925 ℃～1050 ℃ recrystallizations form aluminium silicon spinel, strong exothermic peak of corresponding appearance.1100 ℃～1200 ℃ aluminium silicon spinels begin to be converted into false mullite.1200 ℃～1300 ℃ false mullites are converted into and cristobalite.
The high-quality calcined kaolin that production papermaking, coating and other industry are used is to utilize above kaolinic differential thermal character, control meets the temperature curve and the calcination atmosphere of the physicochemical change of kaolinite when heating, the control top temperature is lower than 1050 ℃, produces the calcined kaolin products that essential mineral is the sial spinel.
Present kaolin calcined equipment generally has static and half dynamic two class calciners.
Static incinerating exemplary apparatus such as tunnel furnace.This kind method is contained in material to place on the kiln car in the saggar and calcines in tunnel furnace, and in addition, flame-guiding kiln, pushed bat kiln etc. also belongs to this kind equipment.This kind equipment is because static calcining manners inherent limitation, product contamination is serious, throughput is low, handles raw ore 0.3～0.5 ten thousand ton, energy consumption height in general year, the production cost height, floor space is big, and producers are many, and labour intensity is big, coarse grained low grade products can only be produced, the requirement of modernized scale operation can not be adapted to.
Half dynamic calcining equipment mainly contains two kinds, and a kind of is shaft kiln calcination equipment.As countries such as the U.S. and France, adopt this equipment abroad.The shaft kiln profile diameter is generally 6m～8m, high 20m, and the body of heater refractory liner is built into the several layers plate from top to bottom in the stove, have inspection window on every side.The vertical tubular shaft in useful chilled air cools axle center, body of heater center is equipped with scraper plate that along continuous straight runs rotates with axle to promote material, about 0.5～0.6 rev/min of the speed of mainshaft on the axle.Solar oil or Sweet natural gas enter directly burning heating in the stove by the body of heater side, discharge useless flue gas from furnace roof portion.On material is added to fixedly plate from the shaft kiln top, the about 30～50mm of thickness, scraper plate is pushed the material of last layer to the second layer by the center, and the scraper plate of the second layer is pushed material to the 3rd layer by periphery again, and circulation is carried out successively, successively falls and discharges calcination product up to the bottom.This equipment capacity is big, and general yearly capacity can reach 6～100,000 tons, and the control degree height can be produced the fine calcined kaolin products automatically.Also has a kind of vertical furnace calciner at present, this equipment class is similar to the lime calcining vertical kiln equipment, the basic process of production is that calcining materials is pressed into external diameter 50mm earlier, in through 20mm, the hollow annular piece of high 50mm feeds shaft kiln from the top of kiln, warm air enters from the shaft kiln bottom, artificial bottom discharge from kiln, and then, become the finished product with the broken ore grinding of bulk product.Block calcining can't obtain high-quality calcined kaolin, and the calcining difficulty of post-processing is bigger.
Another kind of half dynamic calcining equipment is rotary calciner, the rotary calciner that uses at present is the external-heating revolving calcining kiln, the cylindrical shell of this rotary kiln is by high high temperature steel manufacturing, inside is equipped with and is lifted the poplar plate, except that kiln head box, do not use refractory materials, the kiln body is operation and large span support at high temperature for a long time, requires quite high to cylinder material.When being calcining, the calcining manners of external-heating rotary kiln four heating zone are arranged along cylindrical shell outside axis direction, totally 10 burning craters, fuel is in the cylindrical shell indirect heating, calcining materials moves in inner barrel, stack gas and calcining materials are spaced from each other, the character of stack gas generally can not exert an influence to calcining materials, and fuel can also make electricity consumption or solar oil except that using coal gas.The characteristics of this equipment are to calcine the material of fine diffusing shape, and temperature curve and kiln atmosphere are easy to control, can produce high-quality calcined kaolin.But this equipment manufacturing cost costliness, because fuel in cylindrical shell external firing, conducts heat to the material of inside by barrel wall, so thermo-efficiency is relatively low, because the kiln body is operation and large span support at high temperature for a long time, be affected work-ing life, occurs problems such as kiln body crack easily.
At a large amount of internal heat type rotary calciners that adopt of calcining mineral, its thermo-efficiency height has obtained using widely in metallurgical industry and Cement industry at present.But because it can only can not satisfy the interior warm area of kiln and form the temperature distribution environment requirement that meets calcination-temperature profile in the end heating of kiln.And the refractory materials of kiln body can cause the pollution to material, is difficult to satisfy the requirement of calcining high grade kaolinite and is not applied.
Summary of the invention
Purpose of the present invention is exactly in order to overcome the deficiency that above-mentioned prior art exists, requirement and the kiln cost of a kind of effective reduction to kiln body material is provided, effectively improve kiln body work-ing life, improve Energy efficiency, a kind of rotary calciner calcined kaolin method and rotary calciner thereof used that burning quality is high.
The objective of the invention is to be achieved through the following technical solutions.
A kind of with rotary calciner calcined kaolin method, it is characterized in that it being to adopt the internal heat type rotary calciner to calcine, calcining materials feeds from kiln one end material feeding end, discharge through the other end burner end from kiln after the calcination area of differing temps, material is in the kiln body that to revolve the direction of heat flow that shape rollover states uniform motion direction and burner produce opposite, and material feeding end is a strong oxidizing atmosphere, oxygenous volume is than being 15%-17% in the atmosphere, discharge end is a weakly reducing atmosphere, and containing the carbon monoxide volume ratio in the coal gas is 24%-27%; The pressure-controlling of kiln is little negative pressure, the temperature of the warm area in the control rotary calciner kiln and the time that material passes through each warm area of rotary calciner:
A. controlling rotary calciner material material feeding end kiln temperature is 600 ℃;
B. controlling material is 70-80 minute in the time of kiln by 600 ℃ to 950 ℃ temperature province of even intensification;
C. controlling material is 15-25 minute at kiln by 950 ℃ of-1030 ℃ of temperature provinces;
D. control material and after kiln is 10-20 minute by 800 ℃ of-850 ℃ of temperature provinces, discharge the kiln body.
A kind of calcined kaolin rotary calciner, this equipment comprises:
Rotary kiln body-this kiln body is the cylinder-shaped steel structure, internal heat type rotary calciner thermal insulation layer and with thermal insulation layer be that plate is raised in integrally-built act, the external wall of kiln is equipped with kiln body blower fan and the power supply slip-ring device that rotates with the kiln body, the high temperature resistant airduct that is connected with air outlet of blower fan passes the kiln body and stretches in the kiln to regulate temperature and the atmosphere in the kiln, be axially arranged with the slip-ring device of 3-6 point for measuring temperature and transmission signal at the external wall of kiln along it, the external wall postmedian of kiln is provided with the transmission mechanism master wheel, by motor via reducer and the rotation of gear driven kiln body, before the external wall of kiln, in, the rear portion is established the roller circle and is supported on the bearing support by carrying roller, the kiln body axis becomes the inclination angle with level, and kiln height end height value is 1%-3% with the ratio of kiln axon line length ";
Kiln head box-this kiln head box is installed on the discharge end of kiln body, adopts labyrinth seal to be connected between inner lining refractory and kiln body, and internal-mixing rotating paddle combustion unit and discharge device are installed on the kiln head box end face;
Adopt labyrinth seal to be connected between kiln boot-the be installed on material feeding end of kiln body, liner material and kiln body, kiln boot end face is equipped with spiral feeding device.
Method of the present invention adopts the internal heat type rotary calciner, material and stack gas are in the same space, material and the operation of warm air adverse current, and the kiln body is by the plain carbon stool manufacturing, inner lining refractory also is equipped with the act poplar plate that stirs material, and the kiln body is equipped with the kiln body blower fan of regulating kiln atmosphere.During rotary kiln work, calcining materials feeds from the kiln tail, after the calcining of differing temps zone, discharge from kiln hood, warm air enters from kiln hood, discharges from the kiln tail, regulate the amount of feeding of kiln head heat air and pressure and other parameter of kiln tail stack gas, temperature distribution and atmosphere in the may command kiln.
Internal heat type rotary calciner of the present invention can use coal gas or solar oil, during fuel combustion, combustion flame can directly not contact with calcining materials, penetrating direct heating by the width of cloth calcines, flue gas direct heating material is with the thermo-efficiency height, with the situation of external-heating revolving calcining kiln same treatment ability under, fuel consumption is generally 60%～70% of external-heating rotary kiln, the raw meal particle size of processing is the kaolin of fine (45 μ m) and ultra tiny (2 μ m＞90%).
Internal heat type rotary calciner cost of the present invention is low, and when reaching the technical indicator identical with the external-heat calcination rotary kiln, its cost has only 1/4～1/5 of external-heating revolving calcining kiln, and work-ing life is long.Reduced the investment and the production cost of calcined kaolin equipment significantly, the equipment operation condition is stable, and system is easy to control, the efficiency of energy utilization height, and production management is convenient, and operation life is long, is suitable for the large-scale commercial production calcined kaolin.
The refractory materials material of internal heat type rotary calcining kiln lining of the present invention is the phosphate-combined high-aluminium brick, and the common kiln lining of effective elimination of its high-quality performance is to the influence of quality product.
Internal heat type rotary calciner brick masonary of the present invention has whole material delivering plate form structure, can carry out mandatory stirring to the little material of frictional coefficient, obtains more uniform heat transfer and better technology calcining performance.
On the internal heat type rotary calciner kiln body of the present invention gas blower is installed, air is sent in the kiln, can regulate the temperature and the atmosphere of any section in the kiln, satisfy different processing requirements by high-temperature resistant tube.
The rotation of kiln body is by the gear-wheel gear-ring transmission.Primover reaches the purpose that the kiln body turns round through multipole deceleration, and primover is an electromagnetic variable speed motor, and speed adjustable range is big, and speed governing is steadily reliable.
The rotary kiln that method of the present invention is used is selected a kind of low-temperature concretion, wear-resistant stripping, anticorrosive, the high-intensity refractory materials liner as rotary kiln for use, with the influence of thorough elimination kiln lining to quality product.Adjusting is installed on the kiln body blower fan on the kiln body, to control temperature distribution and the calcination atmosphere in the kiln as required; Regulate the flow and the pressure of burner fuel, with the control flue-gas temperature.Regulate the velocity of rotation of rotary kiln, with the calcination time of control material in kiln.Regulate feed and discharge device, with the throughput of control rotary kiln.By coordinating the various processing parameters and the thermal regulation of whole calcination system,, thereby finish calcination process continuously, production high-quality calcined kaolin (whiteness＞94) with the control dust rate.
The internal heat type rotary calciner is used for temperature (＜1050 ℃) or low temperature (＜700 ℃) calcining hard kaoline or soft kaolin, product is a kind of functional pigment of high porosity, in order to coating and the filler and the preparation high purity aluminium oxide of production papermaking, paint, catalyzer and rubber and plastics.Its working process is: feed through the kaolin of processing of ultra-fine (45 μ m) or ultra tiny delaminating (2 μ m＞90%) and drying (water ratio＜3%) end (kiln tail) from rotary kiln, through preheating section, temperature rise section and calcining section, discharge by the other end (kiln hood) of rotary kiln.Because the revolution of kiln and the inclination of kiln axis, make kaolin raise under the drive of plate in kiln shape tumbling motion in the shape of a spiral in a kind of act of particular design, and this direction of motion is opposite with the high temperature gas flow direction that is produced by burner, in this process, owing to taked special combustion technology, high-temperature flue gas not with kiln in kaolin directly contact, but make kaolin and high-temperature flue gas by radiation, conduction, forms such as convection current are carried out sufficient heat exchange, fuel can be producer gas, Sweet natural gas or solar oil, owing to adopt the direct heating mode, so efficiency of utilization is than higher.
Description of drawings
Fig. 1 is an internal heat type rotary calciner structural representation of the present invention.
Fig. 2 is an internal heat type rotary calciner structure A-A diagrammatic cross-section of the present invention.
Embodiment
A kind of with rotary calciner calcined kaolin method, it is characterized in that it being to adopt the internal heat type rotary calciner to calcine, calcining materials feeds from kiln one end material feeding end, discharge through the other end burner end from kiln after the calcination area of differing temps, material is in the kiln body that to revolve the direction of heat flow that shape rollover states uniform motion direction and burner produce opposite, and material feeding end is a strong oxidizing atmosphere, oxygenous volume is than being 15%-17% in the atmosphere, discharge end is a weakly reducing atmosphere, and containing the carbon monoxide volume ratio in the coal gas is 24%-27%; The pressure of kiln is little negative pressure, and it is 600 ℃ that the temperature of the warm area in the control rotary calciner kiln and material are controlled rotary calciner material material feeding end kiln temperature by the time of each warm area of rotary calciner: a.; B. controlling material is 70-80 minute in the time of kiln by 600 ℃ to 950 ℃ temperature province of even intensification; C. controlling material is 15-25 minute at kiln by 950 ℃ of-1030 ℃ of temperature provinces; D. control material and after kiln is 10-20 minute by 800 ℃ of-850 ℃ of temperature provinces, discharge the kiln body.
A kind of calcined kaolin rotary calciner, it is characterized in that this equipment comprises: rotary kiln body (4)-this kiln body is the cylinder-shaped steel structure, the inner lining refractory thermal insulation layer and with thermal insulation layer be integrally-built act poplar plate, the external wall of kiln is equipped with kiln body blower fan (5) and the power supply slip-ring device (7) that rotates with the kiln body, the high temperature resistant airduct that is connected with air outlet of blower fan passes the kiln body and stretches in the kiln to regulate temperature and the atmosphere in the kiln, be axially arranged with the slip-ring device of 3-6 point for measuring temperature (6) and transmission signal at the external wall of kiln along it, the external wall postmedian of kiln is provided with the transmission mechanism master wheel, drive the rotation of kiln body by motor via reducer and gear (8), before the external wall of kiln, in, the rear portion is established the roller circle and is supported on the bearing support by carrying roller (3), and the kiln body axis becomes 1%～3% inclination angle with level.Kiln head box (2)-this kiln head box is installed on the discharge end of kiln body, adopts labyrinth seal to be connected between inner lining refractory and kiln body, and internal-mixing rotating paddle combustion unit (1) and discharge device (11) are installed on the kiln head box end face; Adopt labyrinth seal to be connected between kiln boot (9)-the be installed on material feeding end of kiln body, liner and kiln body, kiln boot end face is equipped with spiral feeding device (10).
Embodiment
With granularity is that the kaolin calcined material of fine (45 μ m) and ultra tiny (2 μ m＞90%) feeds from kiln one end material feeding end, it is strong oxidizing atmosphere that control kiln body fan delivery makes the interior material feeding end of kiln, oxygenous volume is than being 10%-14% in the atmosphere, discharge end is a weakly reducing atmosphere, and containing the carbon monoxide volume ratio in the coal gas is 25%-27%; Regulate the flow and the pressure of burner fuel, with the control flue-gas temperature.It is 600 ℃ that control combustion unit quantity combusted and air quantity make rotary calciner material material feeding end kiln temperature; The control material is 80 minutes in the time of kiln by 600 ℃ to 950 ℃ temperature province of even intensification; The control material is 20 minutes at kiln by 950 ℃ of-1030 ℃ of temperature provinces; D. control material and after kiln is 10 minutes by 800 ℃ of-850 ℃ of temperature provinces, discharge the kiln body.Finish calcination process continuously, production high-quality calcined kaolin (whiteness＞94).
Claims (1)
1. one kind with rotary calciner calcined kaolin method, it is characterized in that it being to adopt the internal heat type rotary calciner to calcine, calcining materials feeds from kiln one end material feeding end, discharge through the other end burner end from kiln after the calcination area of differing temps, material is in the kiln body that to revolve the direction of heat flow that shape rollover states uniform motion direction and burner produce opposite, and material feeding end is a strong oxidizing atmosphere, oxygenous volume is than being 15%-17% in the atmosphere, discharge end is a weakly reducing atmosphere, and containing the carbon monoxide volume ratio in the coal gas is 24%-27%; The pressure-controlling of kiln is little negative pressure, the temperature of the warm area in the control rotary calciner kiln and the time that material passes through each warm area of rotary calciner:
A. controlling rotary calciner material material feeding end kiln temperature is 600 ℃;
B. controlling material is 70-80 minute in the time of kiln by 600 ℃ to 950 ℃ temperature province of even intensification;
C. controlling material is 15-25 minute at kiln by 950 ℃ of-1030 ℃ of temperature provinces;
D. control material and after kiln is 10-20 minute by 800 ℃ of-850 ℃ of temperature provinces, discharge the kiln body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021594201A CN100366535C (en) | 2002-12-31 | 2002-12-31 | Method for calcining kaolin by rotary calcining kiln and rotary calcining kiln thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021594201A CN100366535C (en) | 2002-12-31 | 2002-12-31 | Method for calcining kaolin by rotary calcining kiln and rotary calcining kiln thereof |
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|---|---|
| CN1417114A CN1417114A (en) | 2003-05-14 |
| CN100366535C true CN100366535C (en) | 2008-02-06 |
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| CN102564110A (en) * | 2010-12-07 | 2012-07-11 | 中铝国际技术发展有限公司 | Lime rotary kiln |
| CN103848223B (en) * | 2012-11-30 | 2016-01-13 | 咸阳华清设备科技有限公司 | The technological process of powder sintering saggar automated handling material complete equipment |
| US9982947B2 (en) | 2013-06-04 | 2018-05-29 | Sichuan Ko Chang Technology Co., Ltd. | Rotary kiln for reducing phosphate ore in kiln phosphoric acid process and method for solving ring forming in kiln tail in kiln phosphoric acid process |
| CN104211032B (en) * | 2013-06-04 | 2015-12-02 | 四川玖长科技有限公司 | Reduce in kiln-process phosphoric acid technique Rock Phosphate (72Min BPL) rotary kiln and solve the method for kiln-process phosphoric acid process kiln caudal knot circle |
| CN103911506B (en) * | 2014-04-18 | 2016-10-12 | 长沙有色冶金设计研究院有限公司 | The method of wind concurrent heating roasting decarburization is adjusted in a kind of Carbonaceous gold ore lifting |
| CN103979550B (en) * | 2014-05-29 | 2016-09-21 | 内蒙古超牌建材科技有限公司 | Metakaolin method for calcinating and prepared metakaolin |
| CN105540599B (en) * | 2015-12-22 | 2018-03-09 | 山西晋坤矿产品股份有限公司 | A kind of method that efficient calcining of gangue oxygenation prepares high grade kaolinite |
| CN107218801A (en) * | 2017-06-12 | 2017-09-29 | 南京新中磁电技术工程有限公司 | A kind of novel energy-conserving internal heat type wet process rotary kiln |
| CN108571887A (en) * | 2017-08-16 | 2018-09-25 | 江苏安必信环保设备有限公司 | A kind of interior heat pipe rotary calciner |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1249279A1 (en) * | 1985-01-11 | 1986-08-07 | Всесоюзный Научно-Исследовательский И Проектный Институт "Теплопроект" | Method of heat treatment of lump materials and device for effecting same |
| JPH02250060A (en) * | 1989-03-23 | 1990-10-05 | Kanzaki Paper Mfg Co Ltd | Electrostatic recording material |
| CN1059745A (en) * | 1991-01-11 | 1992-03-25 | 潘德富 | Process for roasting kaolin |
| CN1367365A (en) * | 2001-09-19 | 2002-09-04 | 冯建明 | Rotary kiln with resistor furnace for heating and calcining kaolin |
-
2002
- 2002-12-31 CN CNB021594201A patent/CN100366535C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1249279A1 (en) * | 1985-01-11 | 1986-08-07 | Всесоюзный Научно-Исследовательский И Проектный Институт "Теплопроект" | Method of heat treatment of lump materials and device for effecting same |
| JPH02250060A (en) * | 1989-03-23 | 1990-10-05 | Kanzaki Paper Mfg Co Ltd | Electrostatic recording material |
| CN1059745A (en) * | 1991-01-11 | 1992-03-25 | 潘德富 | Process for roasting kaolin |
| CN1367365A (en) * | 2001-09-19 | 2002-09-04 | 冯建明 | Rotary kiln with resistor furnace for heating and calcining kaolin |
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