CN113562992A - High-iron aluminate cement - Google Patents
High-iron aluminate cement Download PDFInfo
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- CN113562992A CN113562992A CN202110674141.1A CN202110674141A CN113562992A CN 113562992 A CN113562992 A CN 113562992A CN 202110674141 A CN202110674141 A CN 202110674141A CN 113562992 A CN113562992 A CN 113562992A
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- Prior art keywords
- bauxite
- parts
- aluminate cement
- accounts
- iron aluminate
- 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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- 239000004568 cement Substances 0.000 title claims abstract description 42
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 34
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 66
- 238000001354 calcination Methods 0.000 claims abstract description 39
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 32
- 239000010440 gypsum Substances 0.000 claims abstract description 32
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 20
- 239000011575 calcium Substances 0.000 claims abstract description 20
- 239000004575 stone Substances 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 14
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 11
- -1 iron aluminate Chemical class 0.000 claims description 16
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 14
- 229910052593 corundum Inorganic materials 0.000 claims description 14
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 14
- 238000000354 decomposition reaction Methods 0.000 claims description 8
- BYFGZMCJNACEKR-UHFFFAOYSA-N aluminium(i) oxide Chemical compound [Al]O[Al] BYFGZMCJNACEKR-UHFFFAOYSA-N 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052782 aluminium Inorganic materials 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 150000004645 aluminates Chemical class 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
-
- 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
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
Landscapes
- 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)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses high-iron aluminate cement, which is obtained by calcining bauxite in an out-of-kiln decomposing furnace; the calcined bauxite raw material is also added with the hypercalcite and the desulfurized gypsum; according to weight percentage, 35 to 37 portions of bauxite, 47 to 49 portions of high calcium stone and 15 to 17 portions of desulfurized gypsum. The invention has the beneficial effects that: solves the problems of short setting time, low strength and poor corrosion resistance of the prepared high-iron aluminate cement by adopting the traditional calcining process and raw material proportion when the aluminum content in the bauxite is lower.
Description
Technical Field
The invention relates to the technical field of cement, in particular to high-iron aluminate cement.
Background
The decomposition technology outside the kiln is to preheat raw cement powder and decompose most of calcium carbonate in a preheater and a decomposing furnace outside the kiln, is developed in the first 70 th 20 th century, and is a great technical innovation for calcining cement clinker in a dry-process rotary kiln.
At present, the special cement calcined by using a kiln outside decomposing furnace system at home only contains sulphoaluminate clinker, and the calcined ferroaluminate clinker prepared by calcining iron bauxite by using a kiln outside decomposing furnace is not precedent. Particularly, when the aluminum content in the bauxite is low, the high-iron aluminate cement prepared by adopting the traditional calcining process and the raw material proportion has the problems of short coagulation time, low strength and poor corrosion resistance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the high-iron aluminate cement.
The purpose of the invention is realized by the following technical scheme: a high-iron aluminate cement is prepared by calcining bauxite in a kiln external decomposing furnace;
furthermore, the calcined bauxite raw material is also added with the hypercalcite and the desulfurized gypsum;
further, according to the weight percentage, 35 to 37 portions of bauxite, 47 to 49 portions of high calcium stone and 15 to 17 portions of desulfurized gypsum;
further, the bauxite contains 48.25%, 48.86% or 51.61% of Al2O 3;
further, when the content of Al2O3 in the bauxite is 48.25%, the bauxite accounts for 36-37 parts, the high calcium stone accounts for 47-48 parts and the desulfurized gypsum accounts for 16 parts by weight;
further, when the content of Al2O3 in the bauxite is 48.86%, the bauxite accounts for 37-38 parts, the high calcium stone accounts for 46-47 parts and the desulfurized gypsum accounts for 16 parts by weight;
further, when the content of Al2O3 in the bauxite is 51.61%, according to parts by weight, the bauxite accounts for 36-37 parts, the high calcium stone accounts for 47-48 parts, and the desulfurized gypsum accounts for 16 parts;
further, the calcining temperature of the decomposition furnace outside the kiln is 1250-1300 ℃;
the further technical proposal is that the heat preservation time of the calcination is 30 min.
The invention has the following advantages:
1. the bauxite with lower aluminum content is calcined by adopting an external kiln decomposing furnace, and the high-calcium stone and the desulfurized gypsum are added for calcination processing, so that the prepared high-iron aluminate cement clinker has the advantages of obvious side length of the setting time relative to the sulphoaluminate clinker, low early strength, high later strength and large growth range, is suitable for producing slow setting cement required by the market, and meanwhile, the cement has corrosion resistance and is suitable for the ocean; 2. The blank of the process for calcining the iron aluminate clinker by using the kiln external decomposing furnace is made up.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings.
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 high-iron aluminate cement is prepared by calcining bauxite in a kiln external decomposing furnace;
the calcined bauxite raw material is also added with the hypercalcite and the desulfurized gypsum; the bauxite with lower aluminum content is calcined by adopting an external kiln decomposing furnace, and the high-calcium stone and the desulfurized gypsum are added for calcination processing, so that the prepared high-iron aluminate cement clinker has the advantages of obvious side length of the setting time relative to the sulphoaluminate clinker, low early strength, high later strength and large growth range, is suitable for producing slow setting cement required by the market, and meanwhile, the cement has corrosion resistance and is suitable for the ocean; the blank of the process for calcining the iron aluminate clinker by using the kiln external decomposing furnace is made up.
According to weight percentage, 35 to 37 portions of bauxite, 47 to 49 portions of high calcium stone and 15 to 17 portions of desulfurized gypsum; the reasonable proportion is favorable for generating proper synergistic action among various raw materials in the process of calcining, improving the corrosion resistance and strength of the iron aluminate clinker and prolonging the condensation time.
The bauxite contains 48.25%, 48.86% or 51.61% of Al2O 3; the compositional analysis of the native bauxite, as well as the hypercalcites and desulfurized gypsum, is shown in Table 1 below.
TABLE 1 analysis of chemical composition of raw materials
| loss | SiO2 | Al2O3 | Fe2O3 | CaO | MgO | SO3 | TiO2 | K+ | |
| No. 1 bauxite | 11.00 | 12.15 | 48.25 | 22.29 | 0.67 | 1.68 | ＿ | 2.81 | 0.25 |
| No. 2 bauxite | 9.57 | 6.41 | 28.86 | 29.28 | 0.50 | 1.44 | ＿ | 2.94 | 0.25 |
| 3# bauxite | 11.50 | 13.07 | 51.61 | 16.60 | 0.50 | 1.56 | ＿ | 2.81 | 0.3 |
| High calcium stone | 42.55 | 1.78 | 0.84 | 0.36 | 53.20 | ＿ | ＿ | ＿ | ＿ |
| Desulfurized gypsum | 22.85 | 1.42 | 0.98 | 0.36 | 33.03 | 0.36 | 40.91 | ＿ | ＿ |
As can be seen from table 1, the aluminum content in the different bauxite materials is not high, and there is a certain difference between the aluminum content in the three bauxite materials, so as to improve the performance of the aluminoferrite clinker, the proportioning relationship between the bauxite and the desulfurized gypsum needs to be selected in a targeted manner to achieve the best calcination effect.
The calcination temperature of the decomposition furnace outside the kiln is 1250-1300 ℃; and the proper calcination temperature is adopted, so that the calcination effect is favorably improved.
The calcination heat preservation time is 30 min; the heat preservation time of the calcination is not suitable to be overlong or too short, and the strength and the corrosion resistance of the iron aluminate clinker calcined by the decomposition system outside the kiln can meet the requirements only by selecting the calcination temperature suitable for the bauxite.
Example 2: a high-iron aluminate cement is prepared by calcining bauxite in a kiln external decomposing furnace; the calcined bauxite raw material is also added with the hypercalcite and the desulfurized gypsum; the calcined bauxite raw material is also added with the hypercalcite and the desulfurized gypsum; the bauxite with lower aluminum content is calcined by adopting an external kiln decomposing furnace, and the high-calcium stone and the desulfurized gypsum are added for calcination processing, so that the prepared high-iron aluminate cement clinker has the advantages of obvious side length of the setting time relative to the sulphoaluminate clinker, low early strength, high later strength and large growth range, is suitable for producing slow setting cement required by the market, and meanwhile, the cement has corrosion resistance and is suitable for the ocean; the blank of the process for calcining the iron aluminate clinker by using the kiln external decomposing furnace is made up.
When the content of Al2O3 in the bauxite is 48.25%, the bauxite accounts for 36-37 parts, the high-calcium stone accounts for 47-48 parts and the desulfurized gypsum accounts for 16 parts by weight.
The calcination temperature of the decomposition furnace outside the kiln is 1250-1300 ℃.
The calcination temperature is kept for 30 min.
Comparative experimental results are shown in table 2 below for different CM values when bauxite with an Al2O3 content of 48.25% is selected.
TABLE 21 # bauxite comparison of different CM values
Example 3: a high-iron aluminate cement is prepared by calcining bauxite in a kiln external decomposing furnace; the calcined bauxite raw material is also added with the hypercalcite and the desulfurized gypsum; the calcined bauxite raw material is also added with the hypercalcite and the desulfurized gypsum; the bauxite with lower aluminum content is calcined by adopting an external kiln decomposing furnace, and the high-calcium stone and the desulfurized gypsum are added for calcination processing, so that the prepared high-iron aluminate cement clinker has the advantages of obvious side length of the setting time relative to the sulphoaluminate clinker, low early strength, high later strength and large growth range, is suitable for producing slow setting cement required by the market, and meanwhile, the cement has corrosion resistance and is suitable for the ocean; the blank of the process for calcining the iron aluminate clinker by using the kiln external decomposing furnace is made up.
When the content of Al2O3 in the bauxite is 48.86%, the bauxite accounts for 37-38 parts, the high calcium stone accounts for 46-47 parts and the desulfurized gypsum accounts for 16 parts by weight.
The calcination temperature of the decomposition furnace outside the kiln is 1250-1300 ℃.
The calcination temperature is kept for 30 min.
Comparative experimental results for different CM values when bauxite with an Al2O3 content of 48.86% was selected are shown in Table 3 below.
TABLE 32 # bauxite different CM value comparison test
Example 4: a high-iron aluminate cement is prepared by calcining bauxite in a kiln external decomposing furnace; the calcined bauxite raw material is also added with the hypercalcite and the desulfurized gypsum; the calcined bauxite raw material is also added with the hypercalcite and the desulfurized gypsum; the bauxite with lower aluminum content is calcined by adopting an external kiln decomposing furnace, and the high-calcium stone and the desulfurized gypsum are added for calcination processing, so that the prepared high-iron aluminate cement clinker has the advantages of obvious side length of the setting time relative to the sulphoaluminate clinker, low early strength, high later strength and large growth range, is suitable for producing slow setting cement required by the market, and meanwhile, the cement has corrosion resistance and is suitable for the ocean; the blank of the process for calcining the iron aluminate clinker by using the kiln external decomposing furnace is made up.
When the content of Al2O3 in the bauxite is 51.61%, the bauxite accounts for 36-37 parts, the high-calcium stone accounts for 47-48 parts and the desulfurized gypsum accounts for 16 parts by weight.
The calcination temperature of the decomposition furnace outside the kiln is 1250-1300 ℃.
The calcination temperature is kept for 30 min.
Comparative experimental results are shown in table 4 below for different CM values when bauxite with an Al2O3 content of 51.61% is selected.
TABLE 43 bauxite comparison of different CM values
According to the comparison of the examples 2 to 4, when bauxite with the Al2O3 content of 51.61% is selected, 36 to 37 parts of bauxite, 47 to 48 parts of high calcium stone and 16 parts of desulfurized gypsum are selected according to parts by weight, the setting time of the aluminate clinker is relatively longest, the early strength is low, the later strength is highest, the growth range is largest, and the retarded cement is suitable for producing retarded cement required by the market and has better application performance.
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 (9)
1. A high iron aluminate cement is characterized in that: calcining bauxite in an external kiln decomposing furnace.
2. A high iron aluminate cement according to claim 1, characterised in that: the calcined bauxite raw material is also added with the hypercalcite and the desulfurized gypsum.
3. A high iron aluminate cement according to claim 2, characterized in that: according to weight percentage, 35 to 37 portions of bauxite, 47 to 49 portions of high calcium stone and 15 to 17 portions of desulfurized gypsum.
4. A high iron aluminate cement according to claim 3, characterized in that: the bauxite contains 48.25%, 48.86% or 51.61% of Al2O 3.
5. A high iron aluminate cement according to claim 4, characterized in that: when the content of Al2O3 in the bauxite is 48.25%, the bauxite accounts for 36-37 parts, the high-calcium stone accounts for 47-48 parts and the desulfurized gypsum accounts for 16 parts by weight.
6. A high iron aluminate cement according to claim 4, characterized in that: when the content of Al2O3 in the bauxite is 48.86%, the bauxite accounts for 37-38 parts, the high calcium stone accounts for 46-47 parts and the desulfurized gypsum accounts for 16 parts by weight.
7. A high iron aluminate cement according to claim 4, characterized in that: when the content of Al2O3 in the bauxite is 51.61%, the bauxite accounts for 36-37 parts, the high-calcium stone accounts for 47-48 parts and the desulfurized gypsum accounts for 16 parts by weight.
8. A high iron aluminate cement according to claim 1, characterised in that: the calcination temperature of the decomposition furnace outside the kiln is 1250-1300 ℃.
9. A high iron aluminate cement according to claim 1, characterised in that: the calcination temperature is kept for 30 min.
Priority Applications (1)
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| CN202110674141.1A CN113562992A (en) | 2021-06-17 | 2021-06-17 | High-iron aluminate cement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110674141.1A CN113562992A (en) | 2021-06-17 | 2021-06-17 | High-iron aluminate cement |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2825086A1 (en) * | 2001-05-23 | 2002-11-29 | Carrieres Du Boulonnais | PROCESS FOR THE MANUFACTURE OF A SULFO-ALUMINOUS AND / OR FERRO-ALUMINOUS CEMENT, CEMENT OBTAINED BY THIS PROCESS, AND INSTALLATION FOR IMPLEMENTING IT |
| CN101811838A (en) * | 2010-04-16 | 2010-08-25 | 四川川恒化工股份有限公司 | Cement production method |
| CN105366967A (en) * | 2015-11-24 | 2016-03-02 | 镇江市船山第二水泥厂 | Novel cement production process |
| CN108191273A (en) * | 2017-12-27 | 2018-06-22 | 成都锦汇科技有限公司 | A kind of preparation method of ferrous aluminate cement clinker |
| CN111533473A (en) * | 2020-03-30 | 2020-08-14 | 洲际环境科学研究院(广州)有限公司 | Method for preparing ferrous aluminate cement clinker by using Bayer process red mud |
-
2021
- 2021-06-17 CN CN202110674141.1A patent/CN113562992A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2825086A1 (en) * | 2001-05-23 | 2002-11-29 | Carrieres Du Boulonnais | PROCESS FOR THE MANUFACTURE OF A SULFO-ALUMINOUS AND / OR FERRO-ALUMINOUS CEMENT, CEMENT OBTAINED BY THIS PROCESS, AND INSTALLATION FOR IMPLEMENTING IT |
| CN101811838A (en) * | 2010-04-16 | 2010-08-25 | 四川川恒化工股份有限公司 | Cement production method |
| CN105366967A (en) * | 2015-11-24 | 2016-03-02 | 镇江市船山第二水泥厂 | Novel cement production process |
| CN108191273A (en) * | 2017-12-27 | 2018-06-22 | 成都锦汇科技有限公司 | A kind of preparation method of ferrous aluminate cement clinker |
| CN111533473A (en) * | 2020-03-30 | 2020-08-14 | 洲际环境科学研究院(广州)有限公司 | Method for preparing ferrous aluminate cement clinker by using Bayer process red mud |
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| Title |
|---|
| 林宗寿: "《胶凝材料学》", 31 August 2014, 武汉理工大学出版社 * |
| 王燕谋: "《中国特种水泥》", 30 November 2012, 中国建材工业出版社 * |
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Application publication date: 20211029 |