CN1059745A - Process for roasting kaolin - Google Patents
Process for roasting kaolin Download PDFInfo
- Publication number
- CN1059745A CN1059745A CN91100180A CN91100180A CN1059745A CN 1059745 A CN1059745 A CN 1059745A CN 91100180 A CN91100180 A CN 91100180A CN 91100180 A CN91100180 A CN 91100180A CN 1059745 A CN1059745 A CN 1059745A
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- CN
- China
- Prior art keywords
- kiln
- widely different
- different rotary
- flue gas
- rotary kiln
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
A kind of novel process of roasting kaolin, characteristics are with the fluidized bed type fluidizing furnace, combustion technology is introduced rotary kiln burning system, the high-temperature smoke roasting kaolin that utilizes fluidizing furnace to produce, the kaolin burn-off phenomenon of having avoided traditional direct injection in kiln or Coal powder spray burning to produce because of kiln temperature is too high.Adopt material and flue gas countercurrent flow mode, heat exchange is more perfect, the thermo-efficiency height, and the continuity of production is good, and the combustionproperty that the particularly important is the fluidizing furnace excellence can use low calorific value coal to make fuel, and production cost is greatly descended.
Description
The invention belongs to the industrial chemicals field
The present technology of the roasting kaolin that adopts, a kind of is that the kaolin raw material are packed in the closed kiln, through heating, insulation, cooling, kiln discharge again, that is to say and adorn kiln raw material that go out a kiln grog, production is discontinuity, therefore, the utilization ratio of heat energy is lower, and productivity is not high yet.Another kind is as shown in Figure 1: (1) is widely different rotary kiln, and (2) are nozzles, and (3) are raw material, and (4) are grogs.In widely different rotary kiln, pass through nozzle (2) direct injection or coal dust, direct roasting material in kiln from kiln hood.Though this method has realized the continuity of producing, but owing to adopt oil or fat coal, the price height, transportation is difficulty also, production cost is increased, and oil, directly its temperature of combustion of burning is higher in kiln for coal, often surpasses the upper limit (about 930 ℃) of roasting kaolin temperature, thereby the generation burn-off phenomenon.Kaolin after the burning lacks active, does not have industrial utilization to be worth.
The invention provides a kind of can continuous production, can adopt the novel process of low calorific value coal (for example coal gangue, the hard coal that small coal mine is produced etc.) roasting kaolin again.
Its technological process as shown in Figure 2.
1, raw material equipment technology
The kaolin ore enters crusher (2) from feed bin (1) through hopper and carries out fragmentation, sends into bank (4) through vertical elevator (3) again and stores (the bank capacity is determined by industrial scale).
Ore in the bank (4) enters ball mill (5) by screw feeder and pulverizes, and enters high hopper (8) through worm conveyor (6) and vertical elevator (7) again.
2, sinter process
Roasting is carried out in horizontal widely different rotary kiln (10).
Widely different rotary kiln body is a garden tubular steel construction, and inwall is lined with the thermal insulation layer of refractory materials, the thickness of thermal insulation layer kiln body diameter 5%～10% between, be generally 5～20 centimetres; There is gear ring at the middle part of the external wall of kiln, with the toothing of speed reduction unit output terminal, is rotated by driven by motor; The two supports of kiln is on bearing support.There is the inclination angle of 2～5 degree on the axis of kiln and ground during installation.
The high-temperature flue gas that roasting relies on fluidizing furnace to produce is finished.
Binding between fluidizing furnace and the widely different rotary kiln as shown in Figure 3.
Among Fig. 3, (10) widely different rotary kiln, (11) fluidizing furnace, (12) grog hopper, (13) water cooler, (17) coal bunker, (18) gas blower, (19) air outlet.
The pressurized air that gas blower (18) comes is gone out from the air outlet (19) of fluidizing furnace bottom, and the coal that coal bunker (17) is sent into is in the suspended state burning.Because the combustionproperty of the excellence of fluidized-bed, so the hard coal of industrial general no low grade coal of employing such as local small coal mine, coal gangue etc. are made fuel.The high-temperature flue gas that the burning back produces is introduced in the widely different rotary kiln from furnace roof is tangential.
Obviously, the coal that enters in the stove is many more, and the wind that blasts is big more, and then burning is prosperous more, and the temperature of flue gas is also high more.The amount of inserting of control coal, control gas blower induced exhaust valve opening degree, the i.e. temperature of may command flue gas.For kaolin, consider thermosteresis, at kiln hood T
1The flue-gas temperature at place is advisable at 1000 ℃～1050 ℃.
In widely different rotary kiln, high-temperature flue gas and kaolinic heat exchange are the combined processes that has radiation, conduction, convection current concurrently.Kaolin is in kiln, because spiral helicine tumbling motion is being carried out in the effect that widely different commentaries on classics of kiln and kiln axis tilt.This motion is opposite with the flow direction of high-temperature flue gas, thereby heat exchange is comparatively perfect.
The T of widely different rotary kiln
1End is called kiln hood; T
2End is in the kiln; T
3Be the kiln tail.T
1-T
2Section is the roasting stage, T
1The end temperature at 950～1050 ℃, T
2The temperature at place is at 700～750 ℃, and kaolin is at T
1-T
2The time of institute's warp is no less than 25 minutes, is not more than 40 minutes.This depends primarily on the widely different rotary speed of kiln and the setting angle of kiln.Widely different rotary speed is fast more, and then material is descending fast more; The kiln axis tilts more, and then material is descending also fast.The rotating speed of the widely different rotary kiln of kaolin roasting should be at 0.3～1.5 rev/min, and the axis of kiln and ground angle are between 2～5 degree.
T
2-T
3Section is kaolinic pre-heating stage.Its temperature province is at 400 ℃～700 ℃.
3, the cooling of finished product is stored and technology of the package
Kaolin after burning till from widely different commentaries on classics flows out from kiln hood, enters in the receiving hopper (12), enters water cooler (13) cooling again, enters finished product bin (15) by lift (14), flows into wrapping machine (16) packing again.
Claims (5)
1, a kind of kaolin sinter process is made up of raw material crushing, pulverizing, storage and technologies such as roasting maturation, cooling, it is characterized in that its roasting carries out in horizontal widely different rotary kiln; The high-temperature flue gas that is produced by fluidizing furnace is as thermal source; Raw material in kiln motion and the motion of high-temperature flue gas be reverse, carry out continuously.
2, by the described widely different rotary kiln of claim 1, the angle of its axis and horizontal plane is 2～5 degree; The kiln inwall has the thermal insulation layer of refractory materials lining cutting; Its thickness is not less than 5 centimetres, and the widely different rotary speed of widely different rotary kiln is that per minute 0.3～1.5 changes.
3, by the described fluidizing furnace of claim 1, be installed on widely different rotary kiln discharge end, its high-temperature flue gas directly imports widely different rotary kiln.
4, by claim 1 and 3 described high-temperature flue gas, the temperature when going into kiln is at 900～1050 ℃.
5, by the described raw material roasting process of claim 1, the time of institute's warp is between 25～40 minutes in 700～900 ℃ of temperature ranges.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91100180A CN1059745A (en) | 1991-01-11 | 1991-01-11 | Process for roasting kaolin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91100180A CN1059745A (en) | 1991-01-11 | 1991-01-11 | Process for roasting kaolin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1059745A true CN1059745A (en) | 1992-03-25 |
Family
ID=4904486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN91100180A Pending CN1059745A (en) | 1991-01-11 | 1991-01-11 | Process for roasting kaolin |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1059745A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1096416C (en) * | 1996-09-09 | 2002-12-18 | 金文汉 | Activated kaolin powder compound for mixing with cement and method of preparing the same |
| CN100366535C (en) * | 2002-12-31 | 2008-02-06 | 北京矿冶研究总院 | Method for calcining kaolin by rotary calcining kiln and rotary calcining kiln thereof |
| CN108087869A (en) * | 2017-12-27 | 2018-05-29 | 杨松 | A kind of recirculating fluidized bed calcination activation turns round coproduction stove |
| CN110220386A (en) * | 2019-06-04 | 2019-09-10 | 苏州中材非金属矿工业设计研究院有限公司 | A kind of kaolin powder pre-heating system and kaolin powder calcination system and method for calcinating comprising it |
| CN113387367A (en) * | 2021-06-29 | 2021-09-14 | 厦门欣意盛新材料科技有限公司 | Method for preparing kaolin by resource utilization of residue soil of urban building engineering |
-
1991
- 1991-01-11 CN CN91100180A patent/CN1059745A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1096416C (en) * | 1996-09-09 | 2002-12-18 | 金文汉 | Activated kaolin powder compound for mixing with cement and method of preparing the same |
| CN100366535C (en) * | 2002-12-31 | 2008-02-06 | 北京矿冶研究总院 | Method for calcining kaolin by rotary calcining kiln and rotary calcining kiln thereof |
| CN108087869A (en) * | 2017-12-27 | 2018-05-29 | 杨松 | A kind of recirculating fluidized bed calcination activation turns round coproduction stove |
| CN108087869B (en) * | 2017-12-27 | 2019-03-12 | 杨松 | A kind of recirculating fluidized bed calcination activation revolution coproduction furnace |
| CN110220386A (en) * | 2019-06-04 | 2019-09-10 | 苏州中材非金属矿工业设计研究院有限公司 | A kind of kaolin powder pre-heating system and kaolin powder calcination system and method for calcinating comprising it |
| CN113387367A (en) * | 2021-06-29 | 2021-09-14 | 厦门欣意盛新材料科技有限公司 | Method for preparing kaolin by resource utilization of residue soil of urban building engineering |
| CN113387367B (en) * | 2021-06-29 | 2022-08-12 | 厦门欣意盛新材料科技有限公司 | Method for preparing kaolin by resource utilization of residue soil of urban building engineering |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |