CN113816628B - Preparation process of sulphoaluminate cement clinker - Google Patents

Preparation process of sulphoaluminate cement clinker Download PDF

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Publication number
CN113816628B
CN113816628B CN202111165603.3A CN202111165603A CN113816628B CN 113816628 B CN113816628 B CN 113816628B CN 202111165603 A CN202111165603 A CN 202111165603A CN 113816628 B CN113816628 B CN 113816628B
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cement clinker
sulphoaluminate cement
raw material
coal
mixed raw
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CN113816628A (en
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韩学峰
刘银东
候学亮
赵晓东
梁永强
李瑞红
吴少贞
张广浩
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Dengdian Group Cement Co ltd
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Dengdian Group Cement Co ltd
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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
    • 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
    • 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
    • C04B7/4407—Treatment or selection of the fuel therefor, e.g. use of hazardous waste as secondary fuel ; Use of particular energy sources, e.g. waste hot gases from other processes
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

The invention discloses a preparation process of sulphoaluminate cement clinker, which comprises the following steps: s1, mixing and grinding the powdery material of the inert alumina, the high calcium stone, the bauxite and the desulfurized gypsum by a raw material drying air-swept mill to obtain mixed raw materials; s2, calcining the mixed raw material in a dry rotary kiln, and cooling to obtain the sulphoaluminate cement clinker, wherein the method adopts a mode of doping inert alumina to reduce the using amount of bauxite, effectively reduces the production cost, and simultaneously adjusts the original calcining process, ensures the smooth production process and stable product quality, and provides a new direction for industrial solid waste use.

Description

Preparation process of sulphoaluminate cement clinker
Technical Field
The invention relates to the technical field of preparation of sulphoaluminate cement clinker, in particular to a preparation process of sulphoaluminate cement clinker.
Background
The sulphoaluminate cement is a new type cement mainly composed of anhydrous calcium sulphoaluminate and dicalcium silicate, and the mineral composition of said series cement is characterized by containing a large quantity of C 4 A 3 And (4) minerals. So as to distinguish from other series of cement. And the third series of cement has the basic characteristics of high early strength, high impermeability, high frost resistance, corrosion resistance, low alkali, low production energy consumption and the like.
The sulphoaluminate clinker is mainly prepared by bauxite (SiO) 2 ≤14％、Al 2 O 3 62% +/-1) and hypercalcite (SiO) 2 Not more than 2 percent and not less than 52 percent of CaO) is crushed by a crusher, mixed and ground with the desulfurized gypsum in proportion by a raw material drying air swept mill, enters a preheater and a decomposing furnace after passing through a homogenization silo, and finally passes through a dry rotary kilnCalcination to a maximum temperature of 1300 deg.C (a-Al) 2 O 3 ) And is formed after being in a molten state.
The bauxite raw material is large in consumption and high in mining cost, so that the final sulphoaluminate cement is high in production cost, the inert alumina is a solid waste in the electrolytic aluminum industry, the components of the inert alumina are similar to those of the bauxite, and although the inert alumina can replace part of the bauxite to reduce the cost, the inert alumina is a product after high-temperature treatment, the content of solvent minerals of a raw material is increased after the inert alumina is doped, the burnability is good, the process accidents such as skinning and the like easily occur by adopting a traditional preparation process, and the product quality is unstable. Therefore, how to improve the preparation process and improve the utilization rate of solid waste data so as to prepare the sulphoaluminate cement clinker doped with the inert alumina becomes a problem which needs to be solved urgently.
Disclosure of Invention
The invention aims to provide a preparation process of sulphoaluminate cement clinker, which solves the problems that the sulphoaluminate cement clinker doped with inert alumina is easy to have process accidents such as skinning and the like in the preparation process, and the product quality is unstable.
In order to solve the technical problems, the invention adopts the following technical scheme:
a preparation process of sulphoaluminate cement clinker comprises the following steps:
s1, mixing and grinding the powdery material of the inert alumina, the high calcium stone, the bauxite and the desulfurized gypsum by a raw material drying air-swept mill to obtain a mixed raw material with the fineness of a square-hole sieve of 0.08mm being less than or equal to 15%;
and S2, calcining the mixed raw material in a dry rotary kiln, and cooling to obtain the sulphoaluminate cement clinker.
The powdery material of the solid waste inert alumina is doped into the raw material, so that the using amount of bauxite is correspondingly reduced, the production cost is effectively reduced, the solid waste in the aluminum industry is recycled, and the resources are saved.
The further technical scheme is that the inert alumina in the mixed raw material of the step S1 accounts for 5-8% of the total mass of the mixed raw material. Because the inert alumina silicon is low and the aluminum is high, part of low-grade bauxite can be properly used, the purpose of reducing the cost cannot be achieved due to the small doping amount of the inert alumina, the original calcining system is greatly changed due to the large doping amount, and solvent mineral (MgO) with large content is introduced, so that the process control is not facilitated.
The further technical scheme is that in the step S2, the coal ash content of raw coal is less than or equal to 10%, and the ratio of head coal to tail coal is 6: 4.
The quality of raw coal is improved, the proportion of head coal to tail coal is adjusted, and the use amount of the tail coal is reduced so as to reduce the crust of a preheater; the amount of the first coal is increased to enhance the calcination of the raw material in the rotary kiln and reduce the skinning.
According to a further technical scheme, in the step S2, a tail coal branch pipe is arranged between the tail coal pipe and the middle lower part of the smoke chamber connection uptake.
The tail coal pipe enters the smoke chamber uptake flue in one way on the original basis, and a small amount of coal powder is introduced into the uptake flue, so that the problem of increased emission of nitrogen oxides caused by doping inert alumina is solved, and the nitrogen oxides in waste gas are reduced.
The further technical scheme is that in the step S2, a flue gas pipe connected with the outlet end of the primary cyclone cylinder is additionally arranged at the top of the flue gas chamber uptake.
The further technical scheme is that the diameter of the flue gas pipe is 600 mm.
A flue gas pipe with the diameter of 600mm is additionally arranged at the top of a flue ascending from a flue chamber and is led to the outlet of the primary cyclone cylinder, so that the content of solvent minerals can be reduced, the skinning is reduced, and meanwhile, sulfur dioxide in the exhaust emission can be absorbed.
The further technical proposal is that in the step S2, the ventilation area of the throat of the smoke chamber is 1.07-1.09m 2 。
The area of the throat of the smoke chamber is increased, the ventilation resistance is reduced, the reducing atmosphere is avoided, and the stable product quality is ensured.
The invention has the following advantages:
the method for doping the inert alumina is adopted to reduce the using amount of the bauxite, effectively reduce the production cost, and simultaneously adjust the original calcining process, ensure the smooth production process and the stable product quality, and provide a new direction for the use of industrial solid wastes.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are part of the embodiments of the present invention, but not all of the embodiments.
Thus, the following detailed description of embodiments of the invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Example 1
A preparation process of sulphoaluminate cement clinker comprises the following steps:
s1, mixing inert alumina (SiO) 2 ≤3％，Al 2 O 3 More than or equal to 65 percent) is dried, ground and sieved to obtain a powdery material with the fineness of 0.08mm square-hole sieve less than or equal to 10 percent;
s2, mixing and grinding the powdery material of the inert alumina, the high calcium stone, the bauxite and the desulfurized gypsum by a raw material drying air-swept mill to obtain a mixed raw material with the fineness of a square-hole sieve of 0.08mm being less than or equal to 15%;
and S3, calcining the mixed raw material in a dry rotary kiln, and cooling to obtain the sulphoaluminate cement clinker.
And the inert alumina in the mixed raw material of the step S1 accounts for 5 percent of the total mass of the mixed raw material.
In the step S2, the coal ash content of the raw coal is less than or equal to 10%, and the ratio of the head coal to the tail coal is 6: 4.
And in the step S2, a tail coal branch pipe is arranged between the tail coal pipe and the middle lower part of the smoke chamber ascending flue.
In the step S2, a flue gas pipe connected with the outlet end of the primary cyclone cylinder is additionally arranged at the top of the smoke chamber uptake flue, and the diameter of the flue gas pipe is 600 mm.
In the step S2, the ventilation area of the throat of the smoke chamber is 1.07m 2 。
Example 2
A preparation process of sulphoaluminate cement clinker comprises the following steps:
s1, mixing inert alumina (SiO) 2 ≤3％，Al 2 O 3 More than or equal to 65 percent) is dried, ground and sieved to obtain a powdery material with the fineness of a square-hole sieve of 0.08mm being less than or equal to 10 percent;
s2, mixing and grinding the powdery material of the inert alumina, the high calcium stone, the bauxite and the desulfurized gypsum by a raw material drying air-swept mill to obtain a mixed raw material with the fineness of a square-hole sieve of 0.08mm being less than or equal to 15%;
and S3, calcining the mixed raw material in a dry rotary kiln, and cooling to obtain the sulphoaluminate cement clinker.
And the inert alumina in the mixed raw material of the step S1 accounts for 6 percent of the total mass of the mixed raw material.
In the step S2, the coal ash content of the raw coal is less than or equal to 10%, and the ratio of the head coal to the tail coal is 6: 4.
And in the step S2, a tail coal branch pipe is arranged between the tail coal pipe and the middle lower part of the smoke chamber ascending flue.
In the step S2, a flue gas pipe connected with the outlet end of the primary cyclone cylinder is additionally arranged at the top of the smoke chamber uptake flue, and the diameter of the flue gas pipe is 600 mm.
In the step S2, the ventilation area of the throat of the smoke chamber is 1.08m 2 。
Example 3
A preparation process of sulphoaluminate cement clinker comprises the following steps:
s1, mixing inert alumina (SiO) 2 ≤3％，Al 2 O 3 More than or equal to 65 percent) is dried, ground and sieved to obtain a powdery material with the fineness of 0.08mm square-hole sieve less than or equal to 10 percent;
s2, mixing and grinding the powdery material of the inert alumina, the high calcium stone, the bauxite and the desulfurized gypsum by a raw material drying air-swept mill to obtain a mixed raw material with the fineness of a square-hole sieve of 0.08mm being less than or equal to 15%;
and S3, calcining the mixed raw material in a dry rotary kiln, and cooling to obtain the sulphoaluminate cement clinker.
And the inert alumina in the mixed raw material of the step S1 accounts for 7 percent of the total mass of the mixed raw material.
In the step S2, the coal ash content of the raw coal is less than or equal to 10%, and the ratio of the head coal to the tail coal is 6: 4.
And in the step S2, a tail coal branch pipe is arranged between the tail coal pipe and the middle lower part of the smoke chamber ascending flue.
In the step S2, a flue gas pipe connected with the outlet end of the primary cyclone cylinder is additionally arranged at the top of the smoke chamber uptake flue, and the diameter of the flue gas pipe is 600 mm.
In the step S2, the ventilation area of the throat of the smoke chamber is 1.08m 2 。
Example 4
A preparation process of sulphoaluminate cement clinker comprises the following steps:
s1, mixing inert alumina (SiO) 2 ≤3％，Al 2 O 3 More than or equal to 65 percent) is dried, ground and sieved to obtain a powdery material with the fineness of 0.08mm square-hole sieve less than or equal to 10 percent;
s2, mixing and grinding the powdery material of the inert alumina, the high calcium stone, the bauxite and the desulfurized gypsum by a raw material drying air-swept mill to obtain a mixed raw material with the fineness of a square-hole sieve of 0.08mm being less than or equal to 15%;
and S3, calcining the mixed raw material in a dry rotary kiln, and cooling to obtain the sulphoaluminate cement clinker.
And the inert alumina in the mixed raw material of the step S1 accounts for 8 percent of the total mass of the mixed raw material.
In the step S2, the coal ash content of the raw coal is less than or equal to 10%, and the ratio of the head coal to the tail coal is 6: 4.
And in the step S2, a tail coal branch pipe is arranged between the tail coal pipe and the middle lower part of the smoke chamber ascending flue.
In the step S2, a flue gas pipe connected with the outlet end of the primary cyclone cylinder is additionally arranged at the top of the flue gas chamber uptake flue, and the diameter of the flue gas pipe is 600 mm.
In the step S2, the smoke chamber is contracted to openThe wind area is 1.09m 2 。
The cement clinker test performance is as follows:
Figure BDA0003291553690000041
the method reduces the using amount of bauxite by doping inert alumina, effectively reduces the production cost, simultaneously adjusts the original calcining process, ensures the smooth production process, stabilizes the 28d strength of the cement clinker above 40MPa, stabilizes the product quality, and provides a new direction for industrial solid waste use.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims (6)

1. A preparation process of sulphoaluminate cement clinker is characterized by comprising the following steps: the method comprises the following steps: s1, mixing and grinding the powdery material of the inert alumina, the high calcium stone, the bauxite and the desulfurized gypsum by a raw material drying air-swept mill to obtain a mixed raw material with the fineness of a square-hole sieve of 0.08mm being less than or equal to 15%; s2, calcining the mixed raw material in a dry rotary kiln, and cooling to obtain sulphoaluminate cement clinker; in the step S2, the coal ash content of the raw coal is less than or equal to 10%, and the ratio of the head coal to the tail coal is 6: 4.
2. The process for manufacturing a sulphoaluminate cement clinker according to claim 1, wherein: and the inert alumina in the mixed raw material in the step S1 accounts for 5-8% of the total mass of the mixed raw material.
3. The process for manufacturing a sulphoaluminate cement clinker according to claim 1, wherein: and in the step S2, a tail coal branch pipe is arranged between the tail coal pipe and the middle lower part of the smoke chamber ascending flue.
4. The process for manufacturing a sulphoaluminate cement clinker according to claim 1, wherein: in the step S2, a flue gas pipe connected to the outlet end of the primary cyclone is additionally installed at the top of the flue chamber uptake.
5. A process for manufacturing a sulphoaluminate cement clinker according to claim 4, characterized in that: the diameter of the flue gas pipe is 600 mm.
6. The process for manufacturing a sulphoaluminate cement clinker according to claim 1, wherein: in the step S2, the ventilation area of the throat of the smoke chamber is 1.07-1.09m 2 。
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106698986A (en) * 2016-12-27 2017-05-24 嘉华特种水泥股份有限公司 Production method of sulfoaluminate cement clinker
CN108892401A (en) * 2018-08-23 2018-11-27 天津水泥工业设计研究院有限公司 A kind of method and clinker of ardealite calcining belite sulphoaluminate cement clinker
CN109970372A (en) * 2019-05-15 2019-07-05 盐城工学院 A kind of method of mechanochemical method low temperature preparation belite sulphate aluminium cement
CN111517679A (en) * 2020-05-08 2020-08-11 张延年 Multi-solid waste early strength cement and preparation method thereof
CN111635152A (en) * 2020-06-04 2020-09-08 武汉三源特种建材有限责任公司 High belite sulphoaluminate cement clinker and preparation method thereof
CN111704375A (en) * 2020-07-01 2020-09-25 长沙紫宸科技开发有限公司 Method for producing silicate clinker by using modified coal gangue to replace silicon-aluminum raw material ingredients
CN111943533A (en) * 2020-09-03 2020-11-17 济南大学 Red mud-based calcium sulfosilicate-calcium aluminoferrite cement raw material, cement clinker, cement and preparation method thereof
CN112194392A (en) * 2020-10-16 2021-01-08 登电集团水泥有限公司 Sulphoaluminate cement clinker and preparation method thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106698986A (en) * 2016-12-27 2017-05-24 嘉华特种水泥股份有限公司 Production method of sulfoaluminate cement clinker
CN108892401A (en) * 2018-08-23 2018-11-27 天津水泥工业设计研究院有限公司 A kind of method and clinker of ardealite calcining belite sulphoaluminate cement clinker
CN109970372A (en) * 2019-05-15 2019-07-05 盐城工学院 A kind of method of mechanochemical method low temperature preparation belite sulphate aluminium cement
CN111517679A (en) * 2020-05-08 2020-08-11 张延年 Multi-solid waste early strength cement and preparation method thereof
CN111635152A (en) * 2020-06-04 2020-09-08 武汉三源特种建材有限责任公司 High belite sulphoaluminate cement clinker and preparation method thereof
CN111704375A (en) * 2020-07-01 2020-09-25 长沙紫宸科技开发有限公司 Method for producing silicate clinker by using modified coal gangue to replace silicon-aluminum raw material ingredients
CN111943533A (en) * 2020-09-03 2020-11-17 济南大学 Red mud-based calcium sulfosilicate-calcium aluminoferrite cement raw material, cement clinker, cement and preparation method thereof
CN112194392A (en) * 2020-10-16 2021-01-08 登电集团水泥有限公司 Sulphoaluminate cement clinker and preparation method thereof

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