CN104944814A - Low-temperature calcining technology for cement clinker - Google Patents
Low-temperature calcining technology for cement clinker Download PDFInfo
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- CN104944814A CN104944814A CN201510376662.3A CN201510376662A CN104944814A CN 104944814 A CN104944814 A CN 104944814A CN 201510376662 A CN201510376662 A CN 201510376662A CN 104944814 A CN104944814 A CN 104944814A
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- cement clinker
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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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
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Abstract
The invention discloses a low-temperature calcining technology for a cement clinker. According to the low-temperature calcining technology for the cement clinker, a control agent is used as a material component and doped in a raw material according to a certain ratio, and subjected to raw material preparation in a measuring scale; the control agent in the low-temperature calcining technology for the cement clinker disclosed by the invention is an additive needing to be added to form a small-particle clinker, and has the main functions of improving the liquid-phase surface tension of the clinker and controlling the dimensions of the clinker; the control agent is selected from natural gypsum, hard gypsum, fluorapatite, copper slag, steel slag, zinc slag, nickel slag, phosphorus slag, coal ash or the combinations thereof. The cement clinker prepared by the low-temperature calcining technology for the cement clinker provided by the invention has the beneficial effects of high quality, high yield, low consumption, low emission and the like.
Description
Technical field
The present invention relates to a kind of low temperature calcination method of cement clinker, particularly relate to the low temperature calcination method of new type dry kiln.
Background technology
Cement industry is resource, the industry of energy dependent form basic raw material.China is manufacture of cement the biggest in the world and country of consumption, within 2012, China's cement output accounts for 60% of world wide production, manufacture of cement consumes the non-renewable natural resourcess such as a large amount of Wingdales and clay, and consume a large amount of coal electricity equal energy sources, give off the waste gas such as a large amount of carbonic acid gas, sulfurous gas and oxynitrides simultaneously.The huge energy, resource consumption make the Mineral resources of China can't bear the heavy load, a large amount of exhaust gas emissions exacerbates the generation of Greenhouse effect and acid rain, severe contamination environment.The update of current domestic main attention cement technology equipment, not too payes attention to the research and development to cement material itself, still there is sinter leaching temperature high (1450 DEG C), the phenomenon that product carbon emission is high.And reach raising cement output by the Cement industry Development patterns of expanding, meet the needs of the development of the national economy, the further surplus of cement production capacity will be caused, industrial scale expands further, product homogeneity is aggravated, original competition is mainly leaned on in market, and the Sustainable development of the society and economy on China is brought totally unfavorable impact by this.
For realizing energy-saving and environmental protection in cement production process, consumption reduction, usually adopt two kinds of technical schemes: one is by improvement of production process and equipment, regulates and controls raw-material burn-ability and grindability, or reasonable admixture industrial residue; Two is the energy-saving new types of Cernent systems of research and development.At present, the former has made great progress, as the adulterant such as admixture slag, flyash in cement, or adopt Modern New dry production technology and efficient grinding technology, but this technology has gone to bottleneck, thinks to break through very difficult again.And the latter has become the study hotspot of current cement field, so it has been applied and has been subject to conventional cement industry thinking limitation, can not generally use on a large scale.
Along with progress and social environment the improving constantly noxious gas emission requirements such as energy-saving and emission-reduction and minimizing oxynitride of NSP technology.Traditional control method has been felt to be difficult to adapt to these requirements gradually.
Summary of the invention
In order to overcome the defects such as modern Cement industry high energy consumption, maximum discharge, the invention provides a kind of low temperature calcination method of cement clinker, with the cement clinker that this technology is prepared, there is the effects such as high-quality, high yield, low consumption, low emission.
The present invention is that additive ratio is for the control agent of raw material 0.1%-5% in raw material, and adopt new type dry kiln to calcine, precalcining rate controls 94% ~ 99%, and in kiln, firing temperature controls at 1100-1400 DEG C.
A low temperature calcination method for cement clinker, concrete steps are as follows:
1) control agent to be incorporated in raw material according to certain ratio as a kind of starting components to enter weigher and carry out raw material preparation;
2) raw material prepared by step 1) enter raw mill by Belt Conveying, carry out grinding, pre-homogenizing;
3) by step 2) raw material be sent to raw material homogenizing silo by e Foerderanlage and carry out abundant homogenizing;
4) the raw meal powder airlift after homogenizing is pumped to the outer suspended preheater of kiln and exterior decomposing furnace of kiln;
5) material of step 4) carries out carrying out mature calcined material in rotary kiln after preheating Sum decomposition;
6) grog is after refrigerating unit cooling, is delivered to clinker warehouse and deposits.
The low temperature calcination method of described a kind of cement clinker, in step 1), control agent refers to and coordinates the art of this patent to form small-particle grog and a kind of admixture that must add, and major function, for increasing grog liquid phase surface tension, controls clinker size.
The low temperature calcination method of described a kind of cement clinker, is characterized in that, the addition ratio of control agent is 0.1%-5% for cement slurry.
Described control agent is selected from the plaster of paris, anhydrite, fluorapatite, Copper Slag, slag, cadmia, nickel slag, phosphorus slag, flyash, or their combination.
The low temperature calcination method of described a kind of cement clinker, control agent enters into raw mill combined grinding, pre-homogenizing as a kind of starting components by weigher.
The low temperature calcination method of described a kind of cement clinker, control agent directly enters raw material homogenizing silo in proportion.
The low temperature calcination method of described a kind of cement clinker, controls the precalcining rate of raw material 94% ~ 99% in step 4).The operation of cement clinker burning system is the important process being directly connected to cement quality and cost.The core of new dry cement production technology is suspension preheating and precal cination technique.Therefore, adopt the firing system of precal cination technique, first need to ensure the normal table work of kiln tail preheater system particularly decomposing furnace.And make it play preheating Decomposition to greatest extent.Control precalcining rate 94% ~ 99%, that suitably improves decomposing furnace uses air quantity and temperature, can accelerate the burning of coal dust, improves the performance of decomposing furnace.
The low temperature calcination method of described a kind of cement clinker, in step 5), in kiln, firing temperature controls at 1100 DEG C ~ 1400 DEG C.Rate of decomposition for raw material reaches 94% ~ 99%, divides the stop that ungirds just can decompose safely for 2 minutes, the rotating speed of raising kiln that therefore can be suitable, increase the translational speed of material in kiln; And before the stable formation of essential mineral tricalcium silicate, fast to the speed of clinkering zone from kiln tail, heat-up rate also will be fast.The absorption rate of the fast calcium oxide of heat-up rate is also faster, is more conducive to the formation of tricalcium silicate.The activation energy of the new-ecology oxides such as calcium oxide and reactive behavior obtain fully and timely utilizing, and it is good that the clinker mineral that therefore temperature of clinkering zone controls to be formed at 1100 DEG C ~ 1400 DEG C ties grain.Not only can stablize and improve clinker quality and 28d intensity, and grindability is improved.Otherwise if material is excessively of a specified duration in the transitional zone residence time, temperature is too high, macrocrystal Dicalcium Phosphate (Feed Grade) can be formed too early, the phenomenons such as easy ring formation, a bulk.And Dicalcium Phosphate (Feed Grade) at high temperature overstand, compact structure, be unfavorable for that absorbing calcium oxide again to clinkering zone forms tricalcium silicate mineral, the grindability of grog also can reduce.
Compared with prior art, the invention has the advantages that:
1, after high-temperature calcination, the particle size of general purpose portland cement grog mainly concentrates on 5-50 millimeter, first fragmentation is needed to carry out grinding again, and by Portland clinker that this technology is prepared, its particle size mainly concentrates on 0.1-3 millimeter, enters abrasive particle footpath little, can delete the broken link before mill, reduce grinding stage energy consumption, energy consumption is fallen than reaching more than 5%;
2, the firing temperature of general purpose portland cement grog is more than 1450 DEG C, and by the Portland clinker that this technology adopts low temperature calcination to prepare, its firing temperature interval is 1100-1400 DEG C, can reduce to burn till coal consumption 5-15%;
3, method for calcinating of the present invention, can improve decomposing furnace ability and operation stability;
4, due to the reduction of firing temperature, nitrogen oxide emission can be effectively reduced;
5, add due to control agent the formation being conducive to various silicate minerals in clinker burning process, improve the morning of cement clinker, later strength.General purpose portland cement grog 28 days ultimate compression strength is probably in 55-58MPa scope, and the Portland clinker prepared by this technology, its 28 days ultimate compression strength can reach 58-70MPa.
Embodiment
The embodiment of the present invention is described in detail below with reference to ordinary portland cement clinker:
Embodiment 1
Adopt the raw material proportioning of general purpose portland cement, the three ratio control of cement clinker is: KH(lime saturation degree): 0.90 ± 0.02, SM (silicon rate): 2.3 ± 0.1, IM(aluminium rate): 1.5 ± 0.1.The control agent mixing 0.5% carries out raw material preparation, raw material enter homogenizing storehouse after raw mill grinding, raw meal powder after homogenizing is pumped to kiln tail suspended preheater and exterior decomposing furnace of kiln with airlift again, controlling rate of decomposition is 96%, calcine under the high temperature of 1380 DEG C again, calcining grog out enters clinker warehouse after cooling, and the physicals of grog is in table 1.
Table 1
Embodiment 2
Adopt the raw material proportioning of general purpose portland cement, the three ratio control of cement clinker is: KH(lime saturation degree): 0.90 ± 0.02, SM (silicon rate): 2.3 ± 0.1, IM(aluminium rate): 1.5 ± 0.1.The control agent mixing 1.0% carries out raw material preparation, raw material enter homogenizing storehouse after raw mill grinding, raw meal powder after homogenizing is pumped to kiln tail suspended preheater and exterior decomposing furnace of kiln with airlift again, controlling rate of decomposition is 96%, calcine under the high temperature of 1360 DEG C again, calcining grog out enters clinker warehouse after cooling, and the physicals of grog is in table 2.
Table 2
Embodiment 3
Adopt the raw material proportioning of general purpose portland cement, the three ratio control of cement clinker is: KH(lime saturation degree): 0.90 ± 0.02, SM (silicon rate): 2.3 ± 0.1, IM(aluminium rate): 1.5 ± 0.1.The control agent mixing 2.2% carries out raw material preparation, raw material enter homogenizing storehouse after raw mill grinding, raw meal powder after homogenizing is pumped to kiln tail suspended preheater and exterior decomposing furnace of kiln with airlift again, controlling rate of decomposition is 97%, calcine under the high temperature of 1340 DEG C again, calcining grog out enters clinker warehouse after cooling, and the physicals of grog is in table 3.
Table 3
Embodiment 4
Adopt the raw material proportioning of general purpose portland cement, the three ratio control of cement clinker is: KH(lime saturation degree): 0.90 ± 0.02, SM (silicon rate): 2.3 ± 0.1, IM(aluminium rate): 1.5 ± 0.1.The control agent mixing 4.0% carries out raw material preparation, raw material enter homogenizing storehouse after raw mill grinding, raw meal powder after homogenizing is pumped to kiln tail suspended preheater and exterior decomposing furnace of kiln with airlift again, controlling rate of decomposition is 97%, calcine under the high temperature of 1320 DEG C again, calcining grog out enters clinker warehouse after cooling, and the physicals of grog is in table 4.
Table 4
Embodiment 5
Adopt the raw material proportioning of general purpose portland cement, the three ratio control of cement clinker is: KH(lime saturation degree): 0.90 ± 0.02, SM (silicon rate): 2.3 ± 0.1, IM(aluminium rate): 1.5 ± 0.1.The control agent mixing 5.0% carries out raw material preparation, raw material enter homogenizing storehouse after raw mill grinding, raw meal powder after homogenizing is pumped to kiln tail suspended preheater and exterior decomposing furnace of kiln with airlift again, controlling rate of decomposition is 98%, calcine under the high temperature of 1320 DEG C again, calcining grog out enters clinker warehouse after cooling, and the physicals of grog is in table 5.
Table 5
The performance comparison of general purpose portland cement grog P1 and the art of this patent grog
Above-described is only the preferred embodiment of the present invention, it should be pointed out that for the person of ordinary skill of the art, and without departing from the concept of the premise of the invention, can make change possible in a large number, these all belong to protection scope of the present invention.
Claims (4)
1. a low temperature calcination method for cement clinker, comprises the steps:
1) control agent to be incorporated in raw material according to certain ratio as a kind of starting components to enter weigher and carry out raw material preparation;
2) raw material prepared by step 1) enter raw mill by Belt Conveying, carry out grinding, pre-homogenizing;
3) by step 2) raw material be sent to raw material homogenizing silo by e Foerderanlage and carry out abundant homogenizing;
4) the raw meal powder airlift after homogenizing is pumped to the outer suspended preheater of kiln and exterior decomposing furnace of kiln;
5) material of step 4) carries out carrying out mature calcined material in rotary kiln after preheating Sum decomposition;
6) grog is after refrigerating unit cooling, is delivered to clinker warehouse and deposits;
In above-mentioned low temperature calcination method, the precalcining rate of raw material controls 94% ~ 99%; In kiln, firing temperature controls at 1100 DEG C ~ 1400 DEG C, and wherein, the component of control agent comprises the plaster of paris, anhydrite, fluorapatite, Copper Slag, slag, cadmia, nickel slag, phosphorus slag, flyash.
2. the low temperature calcination method of a kind of cement clinker as claimed in claim 1, is characterized in that, the addition ratio of control agent is 0.1%-5% for cement slurry.
3. the low temperature calcination method of a kind of cement clinker as claimed in claim 1, is characterized in that, control agent enters into raw mill as a kind of starting components by weigher.
4. the low temperature calcination method of a kind of cement clinker as claimed in claim 1, it is characterized in that, control agent directly enters raw material homogenizing silo in proportion.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106517835A (en) * | 2016-11-14 | 2017-03-22 | 中海油天津化工研究设计院有限公司 | Sintering catalyst of cement clinker |
| CN107601924A (en) * | 2017-09-25 | 2018-01-19 | 中国葛洲坝集团水泥有限公司 | A kind of modified portland cement clinker and preparation method thereof |
| CN113800790A (en) * | 2021-10-12 | 2021-12-17 | 武汉理工大学 | Cement clinker and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101386480A (en) * | 2008-10-15 | 2009-03-18 | 华南理工大学 | Method for producing portland cement clinker using domestic waste incineration residue |
| CN101633496A (en) * | 2009-08-26 | 2010-01-27 | 李节 | Process for producing cement clinker and co-producing sulfuric acid by using phosphogypsum on outside-kiln cement decomposition system |
| CN102351444A (en) * | 2011-07-21 | 2012-02-15 | 新疆天业（集团）有限公司 | Method for producing high grade cement clinker from full waste residues through rapidly calcining at low temperature |
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2015
- 2015-07-01 CN CN201510376662.3A patent/CN104944814A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101386480A (en) * | 2008-10-15 | 2009-03-18 | 华南理工大学 | Method for producing portland cement clinker using domestic waste incineration residue |
| CN101633496A (en) * | 2009-08-26 | 2010-01-27 | 李节 | Process for producing cement clinker and co-producing sulfuric acid by using phosphogypsum on outside-kiln cement decomposition system |
| CN102351444A (en) * | 2011-07-21 | 2012-02-15 | 新疆天业（集团）有限公司 | Method for producing high grade cement clinker from full waste residues through rapidly calcining at low temperature |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106517835A (en) * | 2016-11-14 | 2017-03-22 | 中海油天津化工研究设计院有限公司 | Sintering catalyst of cement clinker |
| CN106517835B (en) * | 2016-11-14 | 2018-09-04 | 中海油天津化工研究设计院有限公司 | A kind of Cement clinker buring catalyst |
| CN107601924A (en) * | 2017-09-25 | 2018-01-19 | 中国葛洲坝集团水泥有限公司 | A kind of modified portland cement clinker and preparation method thereof |
| CN113800790A (en) * | 2021-10-12 | 2021-12-17 | 武汉理工大学 | Cement clinker and preparation method thereof |
| CN113800790B (en) * | 2021-10-12 | 2022-08-12 | 武汉理工大学 | Cement clinker and preparation method thereof |
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Application publication date: 20150930 |