CN111847929A - Method for producing sulphoaluminate cement clinker by novel dry predecomposition kiln - Google Patents
Method for producing sulphoaluminate cement clinker by novel dry predecomposition kiln Download PDFInfo
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- CN111847929A CN111847929A CN201911362778.6A CN201911362778A CN111847929A CN 111847929 A CN111847929 A CN 111847929A CN 201911362778 A CN201911362778 A CN 201911362778A CN 111847929 A CN111847929 A CN 111847929A
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- fine powder
- kiln
- gypsum
- clinker
- bauxite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/32—Aluminous cements
- C04B7/323—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
Abstract
The invention discloses a method for producing sulphoaluminate clinker by a novel dry kiln, which relates to the technical field of building material preparation and comprises the following steps: s100, uniformly mixing limestone, gypsum and bauxite to obtain a mixed raw material; s200, grinding the mixed raw materials into fine powder; s300, homogenizing the fine powder, then putting the fine powder into a predecomposition kiln outside the kiln for calcination, and taking the fine powder out of the kiln for quenching to obtain the sulphoaluminate clinker. Compared with the prior art, the method can effectively enlarge the productivity and can achieve the output of 2500t per day; (2) the cement clinker produced by the method is more stable; (3) the method can reduce the energy consumption of the produced cement clinker in unit time and reduce the energy consumption cost of enterprises.
Description
Technical Field
The invention relates to the technical field of building material preparation, in particular to a method for producing sulphoaluminate cement clinker by a novel dry predecomposition kiln.
Background
The sulphoaluminate cement is a special cement series successfully researched and developed by Chinese building material science research institute, comprises different cement varieties such as rapid hardening, self-stress, low alkali and the like, is widely applied to building engineering and products such as GRC products, winter construction, self-stress cement pressure pipes, common drain pipes and the like for more than two decades, and achieves good effect; the preparation method is also applied to the aspect of preparing special engineering materials such as waterproof materials, premixed dry-mixed mortar, concrete expanding agents and the like in a certain amount, and is welcomed by users; meanwhile, the method is also applied to special projects such as anti-permeability and leaking stoppage, rush repair and rush construction projects and the like. However, the production of sulphoaluminate cement and clinker is always in miniaturization, and the production and utilization equipment does not exceed a cement clinker production line which produces 1000t per day in view of the limitation of the prior art, so that the energy consumption of products is high, and the quality stability is poor.
Therefore, those skilled in the art have been devoted to developing a method for producing cement clinker with a daily output of more than 1000t, and to producing cement clinker with high stability.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is to provide a method for producing cement clinker with a daily output of more than 1000t, and to provide a cement clinker with a high stability.
In order to achieve the aim, the invention provides a method for producing sulphoaluminate cement clinker by a novel dry-method pre-decomposition kiln, which comprises the following steps:
s100, uniformly mixing limestone, gypsum and bauxite to obtain a mixed raw material;
s200, grinding the mixed raw materials into fine powder;
s300, homogenizing the fine powder, then putting the fine powder into a predecomposition kiln outside the kiln for calcination, and taking the fine powder out of the kiln for quenching to obtain the sulphoaluminate clinker.
Compared with the prior art, the method of the invention has the following technical advantages:
(1) compared with the prior art, the method can effectively enlarge the productivity and can achieve the output of 2500t per day;
(2) the cement clinker produced by the method is more stable;
(3) the method can reduce the energy consumption of the produced cement clinker in unit time and reduce the energy consumption cost of enterprises.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a flow chart of a method of manufacturing a preferred embodiment of the present invention.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the accompanying fig. 1 of the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
As shown in figure 1, the invention provides a flow chart of a method for producing sulphoaluminate cement clinker by a novel dry predecomposition kiln, which comprises the following steps:
s100, uniformly mixing limestone, gypsum and bauxite to obtain a mixed raw material;
s200, grinding the mixed raw materials into fine powder;
s300, homogenizing the fine powder, then putting the fine powder into a predecomposition kiln outside the kiln for calcination, and taking the fine powder out of the kiln for quenching to obtain the sulphoaluminate clinker.
On one hand, compared with the prior art, the method can effectively enlarge the productivity and can achieve the output of 2500t per day;
secondly, the cement clinker produced by the method is more stable;
On the other hand, the method can realize the reduction of the energy consumption of the produced cement clinker in unit time and reduce the energy consumption cost of enterprises.
In a preferred embodiment, the raw materials comprise, in weight percent:
45% -55% of limestone, 10% -16% of gypsum and 32% -45% of bauxite.
In a preferred embodiment, the limestone has a calcium oxide content of 48.0% or more, the bauxite has an aluminum oxide content of 55% or more, and the gypsum includes natural gypsum and industrial by-product gypsum having a sulfur trioxide content of 40% or more in an air-dried basis.
In a preferred embodiment, said step S200 is carried out in a raw mill, which produces a fine powder with a fineness of 80 μm and a sieve residue of 10-15%.
In a preferred embodiment, the homogenization in step S300 is performed in a multi-flow homogenization silo, which is characterized in that the center of the silo bottom is provided with a large cone, and the annular area between the silo wall and the cone is divided into 6 aeration areas which are aerated by a roots blower. The powder material entering the storage is longitudinally and radially mixed and homogenized through the gravity mixing effect, and finally the powder material is stirred and discharged in a conical area at the bottom of the storage, so that the content of each component of the material is uniform and stable after the material passes through the homogenizing storage.
In a preferred embodiment, the calcination temperature in step S300 is 1300-1400 ℃, and the calcination time is 30-35 mins.
In a preferred embodiment, the quenching in step S300 is to be brought to room temperature at a cooling rate of 52-54 ℃/min during the kiln discharge.
In a preferred embodiment, the quenching in step S300 is performed in a grate cooler, which is a grate cooler of the fourth generation, wherein the grate bed and the grate plate are fixed.
In a preferred embodiment, the outlet temperature of the pre-decomposition furnace is 800-.
In a preferred embodiment, the fuel required by the method in production is bituminous coal, and the air drying base heating value of the bituminous coal is more than 26000 kJ/kg.
The implementation of the method is illustrated below by 5 specific examples.
In the embodiment, the gypsum meets G-type or M-type natural gypsum or mixed gypsum specified in GB/T5483, the industrial side gypsum is proved to have no influence on the cement performance when used, and the desulfurized gypsum meets the quality standard specified in GB/T21371 when used;
after the sulphoaluminate clinker is obtained in the following examples 1-5, the performance of the cement mortar is detected according to the proportion, and the compressive strength is detected by a method of a standard GB/T17671-1999 cement mortar strength test.
Example 1
Mixing limestone 51%, gypsum 12.6% and bauxite 36.4%, grinding into fine powder with fineness of 80 μm and residue of 10.5%; setting the sintering temperature of a decomposing furnace to 1330 ℃, calcining the fine powder for 35mins, setting the outlet temperature of the decomposing furnace to 800 ℃, and rapidly cooling to room temperature in a grate cooler at the cooling rate of 52 ℃/min to obtain the sulphoaluminate clinker prepared by the method. The initial setting time of clinker after being taken out of the kiln is 26mins, the final setting time is 35mins, the 1-day compressive strength is 41.2MPa, and the 3-day compressive strength is 56.1 MPa.
Example 2
Mixing 49.5% limestone, 13.5% gypsum and 37% bauxite uniformly, grinding into fine powder with fineness of 80 μm and screen residue of 11.2% in a raw material mill; setting the sintering temperature of a decomposing furnace to 1340 ℃, sintering the fine powder for 31mins, setting the outlet temperature of the decomposing furnace to 815 ℃, and rapidly cooling the fine powder to room temperature in a grate cooler at the cooling rate of 52 ℃/min to obtain the sulphoaluminate clinker prepared by the method. The initial setting time of clinker after being taken out of the kiln is 33mins, the final setting time is 49mins, the 1-day compressive strength is 39.5MPa, and the 3-day compressive strength is 54.7 MPa.
Example 3
Mixing limestone 48.2%, gypsum 14.6% and bauxite 37.2%, grinding into fine powder with fineness of 80 μm and residue of 9.5%; setting the sintering temperature of a decomposing furnace to 1320 ℃, sintering the fine powder for 34mins, setting the outlet temperature of the decomposing furnace to 830 ℃, and rapidly cooling to room temperature in a grate cooler at the cooling rate of 53 ℃/min to obtain the sulphoaluminate clinker prepared by the method. The initial setting time of clinker after being taken out of the kiln is 15mins, the final setting time is 23mins, the 1-day compressive strength is 45.7MPa, and the 3-day compressive strength is 62.4 MPa.
Example 4
Mixing limestone 50.2%, gypsum 11.3% and bauxite 38.5% uniformly, grinding into fine powder with fineness of 80 μm and screen residue of 11.8% in a raw material mill; setting the sintering temperature of the decomposing furnace to 1360 ℃, calcining the fine powder for 30mins, setting the outlet temperature of the decomposing furnace to 815 ℃, and rapidly cooling to room temperature in the grate cooler at the cooling rate of 53 ℃/min to obtain the sulphoaluminate clinker prepared by the method. The initial setting time of clinker after being taken out of the kiln is 29mins, the final setting time is 36mins, the 1-day compressive strength is 42.3MPa, and the 3-day compressive strength is 57.1 MPa.
Example 5
Uniformly mixing 46.5% of limestone, 15.2% of gypsum and 39.3% of bauxite, and grinding into fine powder with fineness of 80 μm and screen residue of 10.2% in a raw material mill; setting the sintering temperature of a decomposing furnace to 1400 ℃, sintering the fine powder for 30mins, setting the outlet temperature of the decomposing furnace to 840 ℃, and rapidly cooling to room temperature in a grate cooler at the cooling rate of 54 ℃/min to obtain the sulphoaluminate clinker prepared by the method. The initial setting time of clinker after being taken out of the kiln is 11mins, the final setting time is 17mins, the 1-day compressive strength is 50.1MPa, and the 3-day compressive strength is 69.2 MPa.
The physicochemical properties of the sulfoaluminate clinkers produced in examples 1-5 are shown in Table 1:
TABLE 1 examination of the physicochemical Properties of the sulphoaluminate Clinker
As shown in the table above, the initial setting time of the example 3 and the initial setting time of the example 5 are respectively 15mins and 11mins, and are within 20mins, which is not less than the initial setting time of other examples, while the final setting time of the example 5 is within 20mins, which is within 17mins, and the 1d compressive strength of the example 5 reaches 50.1MPa, and the 3d compressive strength reaches 69.2MPa, which are both stronger than those of the examples 1-4; from the view of the flexural strength, the 1d flexural strength of the clinker obtained in example 5 reaches 7.2MPa, and the 3d flexural strength reaches 7.6MPa, which are both superior to those obtained in examples 1 to 4, and in conclusion, the sulphoaluminate clinker obtained in example 5 has the most excellent compression resistance and flexural resistance.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A method for producing sulphoaluminate cement clinker by a novel dry predecomposition kiln comprises the following steps:
S100, uniformly mixing limestone, gypsum and bauxite to obtain a mixed raw material;
s200, grinding the mixed raw materials into fine powder;
s300, homogenizing the fine powder, then putting the fine powder into a predecomposition kiln outside the kiln for calcination, and taking the fine powder out of the kiln for quenching to obtain the sulphoaluminate clinker.
2. The method of claim 1, wherein the raw materials preferably comprise, in weight percent:
45% -55% of limestone, 10% -16% of gypsum and 32% -45% of bauxite.
3. The method of claim 2, wherein the limestone has a calcium oxide content of 48.0% or more, the bauxite has an aluminum oxide content of 55% or more, the gypsum includes natural gypsum and industrial by-product gypsum, and has a sulfur trioxide content of 40% or more in an air-dried basis.
4. The method of claim 1, wherein the step S200 is performed in a raw mill, and the raw material is ground into fine powder with a fineness of 80 μm and a sieve residue of 10-15%.
5. The method of claim 1, wherein the homogenization in step S300 is performed in a multi-stream homogenization silo.
6. The method as claimed in claim 1, wherein the calcination temperature in step S300 is 1300-1400 ℃, and the calcination time is 30-35 mins.
7. The method of claim 1, wherein the quenching in step S300 is to room temperature at a temperature reduction rate of 52-54 ℃/min during the kiln discharge.
8. The method as claimed in claim 1, wherein the quenching in step S300 is performed in a grate cooler, which is a grate cooler of the fourth generation, wherein the grate bed and the grate plate are stationary.
9. The method as claimed in claim 1, wherein the pre-decomposition furnace outlet temperature is 800-840 ℃.
10. The method of claim 1, wherein the fuel required in production is bituminous coal, and the air drying base calorific value of the bituminous coal is more than 26000 kJ/kg.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113307517A (en) * | 2021-06-18 | 2021-08-27 | 登电集团水泥有限公司 | Quick-setting curing material and preparation method thereof |
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| CN1374266A (en) * | 2002-04-10 | 2002-10-16 | 中国建筑材料科学研究院 | Calcium aluminate-calcium sulfaluminate cement clinker and the prepn of its swelling agent |
| CN101050072A (en) * | 2007-03-30 | 2007-10-10 | 山东金鲁城有限公司 | Method for producing sulphate aluminum cement |
| EP3199500A1 (en) * | 2016-01-29 | 2017-08-02 | Cimsa Cimento Sanayi Ve Ticaret Anonim Sirketi | Calcium sulphoaluminate cement with mayenite phase |
| CN109503007A (en) * | 2018-12-21 | 2019-03-22 | 嘉华特种水泥股份有限公司 | A method of improving sulfoaluminate clinker whiteness |
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Patent Citations (4)
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| CN1374266A (en) * | 2002-04-10 | 2002-10-16 | 中国建筑材料科学研究院 | Calcium aluminate-calcium sulfaluminate cement clinker and the prepn of its swelling agent |
| CN101050072A (en) * | 2007-03-30 | 2007-10-10 | 山东金鲁城有限公司 | Method for producing sulphate aluminum cement |
| EP3199500A1 (en) * | 2016-01-29 | 2017-08-02 | Cimsa Cimento Sanayi Ve Ticaret Anonim Sirketi | Calcium sulphoaluminate cement with mayenite phase |
| CN109503007A (en) * | 2018-12-21 | 2019-03-22 | 嘉华特种水泥股份有限公司 | A method of improving sulfoaluminate clinker whiteness |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113307517A (en) * | 2021-06-18 | 2021-08-27 | 登电集团水泥有限公司 | Quick-setting curing material and preparation method thereof |
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Application publication date: 20201030 |