CN111170664B - Process for producing cement for airport roads - Google Patents
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- CN111170664B CN111170664B CN202010072174.4A CN202010072174A CN111170664B CN 111170664 B CN111170664 B CN 111170664B CN 202010072174 A CN202010072174 A CN 202010072174A CN 111170664 B CN111170664 B CN 111170664B
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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
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
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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
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a cement production process for airport roads, which mainly comprises the following steps: the method is characterized in that four raw materials of high-quality limestone, fly ash, converter slag and silica are adopted to carry out raw material proportioning, raw material grinding, homogenization treatment, suspension with high solid-gas ratio, preheating and pre-decomposition are sequentially carried out on the raw materials, then the raw materials are sintered into clinker in a novel dry rotary kiln, and cement is prepared by cement grinding by adopting 96.0% of clinker, 4.0% of gypsum and 0.06% of grinding aid. The invention reduces the alkali content in the cement, improves the quality of the cement material, reduces the hydration heat of the cement, prevents the damage of alkali-aggregate reaction to the concrete, can greatly prolong the service life of the airport pavement and reduce the resource waste, thereby generating great economic and social benefits.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a cement production process for airport roads.
Background
With the rapid development of the modern construction of high-grade airport road traffic, the development of cement concrete pavements has been put to the important position of road construction, but the concrete pavements have the advantages of long service life, simple construction and low maintenance cost compared with asphalt pavements, and have the characteristics of good wear resistance and impact resistance, so the cement concrete pavements are widely applied to various countries in the world. Compared with the airport road construction which is rapidly developed abroad, the development of road portland cement in China is relatively slow. At present, not only are the early damages of concrete pavements of airport roads serious, but also the cement of airport roads is unknown with the vast road construction departments besides the construction quality, so that most of the existing concrete pavements still use common cement, thereby limiting the further development of road portland cement. The cement concrete road of the airport road has very strict requirements on cement, which can not be used for any kind of cement at any time, and the selection of the cement for the airport road must be strictly carried out according to the technical requirements.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects in the prior art and disclose a cement production process for airport roads, which reduces the alkali content in cement, improves the quality of cement, reduces the hydration heat of cement, prevents the damage of alkali-aggregate reaction to concrete, can greatly prolong the service life of airport roads and reduce the resource waste, thereby generating great economic and social benefits.
The technical scheme adopted by the invention for solving the technical problems is as follows: a production process of airport road cement comprises the following steps:
the method comprises the following steps: adopting four raw materials of high-quality limestone, fly ash, converter slag and silica to carry out raw material proportioning, and sending the high-quality limestone, fly ash, converter slag and silica to a raw material proportioning station to carry out proportioning and weighing;
step two: placing the prepared raw material in a raw material mill for grinding to ensure that the fineness of the ground raw material is 80 mu m, the screen residue is controlled to be 16 +/-2 percent, and the water content is less than or equal to 0.5 percent;
step three: the ground raw powder enters a homogenizing warehouse through an eight-nozzle distributor to be subjected to circular blowing and stirring, so that the homogenizing effect is achieved;
step four: feeding the homogenized raw meal powder into a preheater for preheating treatment, wherein the five-stage preheating temperature is 800-850 ℃;
step five: the preheated raw meal powder is sent into a decomposing furnace for decomposition treatment, the temperature of the decomposing furnace is 900-1000 ℃, and the decomposition rate is up to more than 93%.
Step six: calcining the decomposed raw material in a rotary kiln for 15-20 min at the kiln tail temperature of 1200 ℃ and the calcining temperature of 1350 ℃ to obtain clinker at the clinker temperature of 80 ℃.
Step seven: cement grinding is carried out by adopting 96.0 percent of clinker, 4.0 percent of desulfurized gypsum and 0.06 percent of grinding aid, and the specific surface area is 350 +/-10 m 2 And sulfur trioxide is 2.3 +/-0.2 percent per kg, and the ground airport road cement is sent into a finished product warehouse.
As a preferred embodiment of the present invention, the high quality limestone consists of the following chemical components: the composition of the coating comprises 42.41 wt% of Loss, 1.86 wt% of silicon dioxide, 1.18 wt% of aluminum oxide, 0.22 wt% of iron oxide, 51.67 wt% of calcium oxide, 1.60 wt% of magnesium oxide, 0.15 wt% of potassium oxide, 0.08 wt% of sodium oxide and 0.18 wt% of alkali.
As a preferred embodiment of the present invention, the fly ash is composed of the following chemical components: a Loss content of 21.84 wt%, a silica content of 37.95 wt%, an alumina content of 25.77 wt%, an iron oxide content of 5.21 wt%, a calcium oxide content of 4.50 wt%, a magnesium oxide content of 0.61 wt%, a potassium oxide content of 0.62 wt%, a sodium oxide content of 0.18 wt% and an alkali content of 0.59 wt%.
As a preferred embodiment of the present invention, the converter slag is composed of the following chemical components: a Loss content of 3.64 wt%, a silica content of 15.37 wt%, an alumina content of 3.63 wt%, an iron oxide content of 25.07 wt%, a calcium oxide content of 38.60 wt%, a magnesium oxide content of 7.19 wt%, a potassium oxide content of 0.16 wt%, a sodium oxide content of 0.19 wt% and an alkali content of 0.30 wt%.
As a preferred embodiment of the invention, the silica consists of the following chemical components: 0.95 wt% Loss, 91.97 wt% silica, 1.72 wt% alumina, 0.80 wt% iron oxide, 2.53 wt% calcium oxide, 0.81 wt% magnesium oxide, 0.09 wt% potassium oxide, 0.11 wt% sodium oxide and 0.17 wt% alkali.
In a preferred embodiment of the present invention, the milled raw meal consists of the following chemical components: 13.42 wt% of silicon oxide, 3.06 wt% of aluminum oxide, 2.56 wt% of iron oxide, 42.04 wt% of calcium oxide, 2.26 wt% of magnesium oxide, 0.30 wt% of alkali and 0.14 wt% of sulfur trioxide.
As a preferred embodiment of the present invention, the homogenized green powder is composed of the following chemical components: 13.30 wt% of silicon oxide, 3.13 wt% of aluminum oxide, 2.49 wt% of iron oxide, 42.02 wt% of calcium oxide, 2.00 wt% of magnesium oxide, 0.32 wt% of alkali and 0.15 wt% of sulfur trioxide.
In a preferred embodiment of the present invention, the homogenized green powder has a value KH of 0.96 ± 0.02, SM of 2.40 ± 0.10, and IM of 1.20 ± 0.10;
in a preferred embodiment of the invention, the clinker trispecificity values are 0.88 ± 0.02 KH, 2.30 ± 0.10 SM and 1.30 ± 0.10 IM, respectively, and the clinker free calcium is less than or equal to 1.0% and clinker C 3 A≤7.0％。
The invention selects high-quality limestone as the calcium raw material instead of low-quality limestone, and the calcium raw material comprises 51.67 percent of CaO, 1.60 percent of MgO and R 2 The content of O is 0.17 percent, the fly ash replaces clay to be used as the silicon-aluminum raw material, and the Al is 2 O 3 25.77% of SiO 2 37.95% of MgO, 0.61% of R 2 O content of 0.59%, converter slag as ferrous material instead of non-ferrous slag, and Fe 2 O 3 The content is 25.07 percent, R 2 The O content is 0.30 percent; silica as a siliceous correcting material, SiO thereof 2 The content of R is as high as 91.97 percent 2 The O content is 0.17, and the oxygen can replace part of the fly ash to reduce the aluminum oxygen value; desulfurized gypsum is selected as cement retarder, and SO of desulfurized gypsum is 3 The content is as high as 35-40%, the quality is stable, the coal quality requirement for fuel selection is 24000kj/kg of heating value, and the ash content is 20 +/-2%; selecting a clinker burdening scheme with medium saturation ratio, low silicon rate and low aluminum oxygen rate, wherein the three rate values of homogenized raw meal powder are KH 0.96 +/-0.02, SM 2.40 +/-0.10 and IM 1.20 +/-0.10; the clinker rate three values are as follows: KH is 0.88 +/-0.02, SM is 2.30 +/-0.10, IM is 1.30 +/-0.0.05, and the cement proportioning scheme is as follows: 96.0 percent of low-alkali clinker, 4.0 percent of desulfurized gypsum and 0.065 percent of grinding aid; the quality of raw materials is ensured, the 80 mu m screen residue of the fineness of the raw material is controlled to be 16 +/-2%, the water content is less than or equal to 0.5%, the qualified rate of the three-rate value of the homogenized raw material powder is controlled to be 80%, the raw material powder enters a homogenizing warehouse through an eight-nozzle distributor, circular blowing and stirring are carried out to achieve the homogenizing effect, the fineness of the coal powder is ensured, the 45 mu m screen residue is 10 +/-2%, and the water content is less than or equal to 2.0%; the calcining temperature of the rotary kiln is improved, the speed, the yield and the temperature of the decomposing furnace of the rotary kiln are reasonably controlled, the ventilation in the rotary kiln is ensured, and the production clinker is homogenized by transferring and matching a plurality of storehouses; improving cement grinding process, controlling cement ratio and making cement ratio surfaceThe product is controlled to be 350 +/-10 m 2 /kg 。
Compared with the prior art, the invention has the following advantages: the alkali content in the cement is reduced, the quality of the cement is improved, the hydration heat of the cement is reduced, the damage of alkali-aggregate reaction to the concrete is prevented, the service life of the airport pavement can be greatly prolonged, the resource waste is reduced, and therefore huge economic and social benefits are generated.
Drawings
FIG. 1 is a flow chart of the production process of the present invention.
Detailed Description
The following description of the embodiments of the present invention refers to the accompanying drawings and examples:
it should be noted that the structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are only for the purpose of understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined by the following claims, and any modifications of the structures, changes in the proportions and adjustments of the sizes, without affecting the efficacy and attainment of the same, are intended to fall within the scope of the present disclosure.
In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
As shown in fig. 1, which illustrates a specific embodiment of the present invention; as shown in FIG. 1, the invention discloses a cement production process for airport roads, which comprises the following steps:
the method comprises the following steps: conveying high-quality limestone in a high-quality limestone pre-homogenization piling shed proportioning bin, fly ash in a fly ash piling shed proportioning bin, converter slag in a converter slag proportioning bin and silica in a silica piling shed proportioning bin to a raw material proportioning station through a belt conveying line, and conveying the high-quality limestone, the fly ash, the converter slag and the silica to the raw material proportioning station for proportioning and weighing, wherein a chemical composition table of the high-quality limestone, the fly ash, the converter slag and the silica is shown in table 1;
TABLE 1 chemical composition table of high quality limestone, fly ash, converter slag and silica
Step two: placing the prepared raw material in a raw material mill for grinding, ensuring that the fineness of the ground raw material is 80 mu m, controlling the screen residue to be 16 +/-2 percent and the water content to be less than or equal to 0.5 percent;
step three: the ground raw powder enters a homogenizing warehouse through an eight-nozzle distributor to be subjected to circular blowing and stirring, so that the homogenizing effect is achieved;
step four: sending the homogenized raw material powder into a preheater for preheating treatment, wherein the five-stage preheating temperature is 800-850 ℃;
step five: the preheated raw meal powder is sent into a decomposing furnace for decomposition treatment, the temperature of the decomposing furnace is 900-1000 ℃, and the decomposition rate is up to more than 93%.
Step six: calcining the decomposed raw material in a rotary kiln for 15-20 min, wherein the kiln tail temperature is 1200 ℃, the calcining temperature is 1350 ℃, and cooling is carried out to obtain clinker, the clinker temperature is 80 ℃, and the chemical components, the specific values and the mineral composition of the raw material and the clinker are shown in a table 2;
TABLE 2 chemical composition, specific value and mineral composition table of raw material and clinker
Step seven: cement grinding is carried out by adopting 96.0 percent of clinker, 4.0 percent of desulfurized gypsum and 0.06 percent of grinding aid, and the specific surface area is 350 +/-10 m 2 And/kg, the sulfur trioxide is 2.3 +/-0.2%, and the grinded airport road cement is sent to a finished product warehouse, wherein the analysis result of the airport road cement product is shown in table 3.
TABLE 3 analysis results of airport road cement
Preferably, the high-quality limestone consists of the following chemical components: the composition of the coating comprises 42.41 wt% of Loss, 1.86 wt% of silicon dioxide, 1.18 wt% of aluminum oxide, 0.22 wt% of iron oxide, 51.67 wt% of calcium oxide, 1.60 wt% of magnesium oxide, 0.15 wt% of potassium oxide, 0.08 wt% of sodium oxide and 0.18 wt% of alkali.
Preferably, the fly ash consists of the following chemical components: a Loss content of 21.84 wt%, a silica content of 37.95 wt%, an alumina content of 25.77 wt%, an iron oxide content of 5.21 wt%, a calcium oxide content of 4.50 wt%, a magnesium oxide content of 0.61 wt%, a potassium oxide content of 0.62 wt%, a sodium oxide content of 0.18 wt% and an alkali content of 0.59 wt%.
Preferably, the converter slag consists of the following chemical components: a Loss content of 3.64 wt%, a silica content of 15.37 wt%, an alumina content of 3.63 wt%, an iron oxide content of 25.07 wt%, a calcium oxide content of 38.60 wt%, a magnesium oxide content of 7.19 wt%, a potassium oxide content of 0.16 wt%, a sodium oxide content of 0.19 wt% and an alkali content of 0.30 wt%.
Preferably, the silica consists of the following chemical composition: 0.95 wt% of Loss, 91.97 wt% of silica, 1.72 wt% of alumina, 0.80 wt% of iron oxide, 2.53 wt% of calcium oxide, 0.81 wt% of magnesium oxide, 0.09 wt% of potassium oxide, 0.11 wt% of sodium oxide and 0.17 wt% of alkali.
Preferably, the milled raw powder consists of the following chemical components: 13.42 wt% of silicon oxide, 3.06 wt% of aluminum oxide, 2.56 wt% of iron oxide, 42.04 wt% of calcium oxide, 2.26 wt% of magnesium oxide, 0.30 wt% of alkali and 0.14 wt% of sulfur trioxide.
Preferably, the homogenized green powder consists of the following chemical components: 13.30 wt% of silicon oxide, 3.13 wt% of aluminum oxide, 2.49 wt% of iron oxide, 42.02 wt% of calcium oxide, 2.00 wt% of magnesium oxide, 0.32 wt% of alkali and 0.15 wt% of sulfur trioxide.
Preferably, the homogenized green powder has respective values KH 0.96 ± 0.02, SM 2.40 ± 0.10 and IM 1.20 ± 0.10.
Preferably, the clinker trispecificity values are KH ═ 0.88 + -0.02, SM ═ 2.30 + -0.10 and IM ═ 1.30 + -0.10, respectively, and clinker free calcium ≦ 1.0% and clinker C 3 A≤7.0％。
The average alkali content of the homogenized raw meal powder is 0.30 percent, the average alkali content of the preheated raw meal powder is 0.32 percent, the average alkali content of the clinker discharged from the decomposing furnace is 0.56 percent, the alkali content of cement on a road of a grinding airport is 0.55 percent, and the clinker discharged from the decomposing furnace is C 3 Content of A6.41%, C 4 The AF content is 12.74 percent, and the 28d flexural strength of the cement is 8.5 MPa; the cement alkali content, free calcium and C of the airport road 3 A、C 4 AF. The indexes such as strength and the like meet the cement index requirements of airport roads in MH 5006-2015, and the requirements of airports are met.
Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (5)
1. A production process of airport road cement is characterized in that: the method comprises the following steps:
the method comprises the following steps: adopting four raw materials of high-quality limestone, fly ash, converter slag and silica to carry out raw material proportioning, and sending the high-quality limestone, fly ash, converter slag and silica to a raw material proportioning station to carry out proportioning and weighing; the converter slag comprises the following chemical components: a Loss content of 3.64 wt%, a silica content of 15.37 wt%, an alumina content of 3.63 wt%, an iron oxide content of 25.07 wt%, a calcium oxide content of 38.60 wt%, a magnesium oxide content of 7.19 wt%, a potassium oxide content of 0.16 wt%, a sodium oxide content of 0.19 wt% and an alkali content of 0.30 wt%;
step two: feeding the prepared raw material into a raw material mill for grinding operation, ensuring that the fineness of the ground raw material is 80 mu m, controlling the screen residue to be 16 +/-2 percent and the water content to be less than or equal to 0.5 percent;
step three: the ground raw powder enters a homogenizing warehouse through an eight-nozzle distributor to be subjected to circular blowing and stirring, so that the homogenizing effect is achieved;
step four: feeding the homogenized raw meal powder into a preheater for preheating treatment, wherein the five-stage preheating temperature is 800-850 ℃;
step five: feeding the preheated raw meal powder into a decomposing furnace for decomposition treatment, wherein the temperature of the decomposing furnace is 900-1000 ℃, and the decomposition rate is up to more than 93%;
step six: calcining the decomposed raw material in a rotary kiln for 15-20 min at the kiln tail temperature of 1200 ℃ and the calcining temperature of 1350 ℃ to prepare clinker at the clinker temperature of 80 ℃;
step seven: cement grinding is carried out by adopting 96.0 percent of clinker, 4.0 percent of desulfurized gypsum and 0.06 percent of grinding aid, and the specific surface area is 350 +/-10 m 2 Per kg, sulfur trioxide is 2.3 +/-0.2 percent, and the ground airport road cement is sent into a finished product warehouse;
wherein the ground raw meal powder consists of the following chemical components: 13.42 wt% of silicon oxide, 3.06 wt% of aluminum oxide, 2.56 wt% of iron oxide, 42.04 wt% of calcium oxide, 2.26 wt% of magnesium oxide, 0.30 wt% of alkali and 0.14 wt% of sulfur trioxide;
the average alkali content of the homogenized raw meal powder is 0.30 percent, the average alkali content of the preheated raw meal powder is 0.32 percent, the average alkali content of the clinker discharged from the decomposing furnace is 0.56 percent, the average alkali content of the cement on a road of a grinding airport is 0.55 percent, and the clinker discharged from the decomposing furnace is C 3 Content of A6.41%, C 4 The AF content is 12.74 percent, the 28d flexural strength of the cement is 8.5MPa, and the cement meets the index requirements of the cement of the airport road in MH 5006-2015.
2. The process for producing airport road cement of claim 1, wherein: the high-quality limestone consists of the following chemical components: 42.41 wt% Loss, 1.86 wt% silica, 1.18 wt% alumina, 0.22 wt% iron oxide, 51.67 wt% calcium oxide, 1.60 wt% magnesium oxide, 0.15 wt% potassium oxide, 0.08 wt% sodium oxide and 0.18 wt% alkali.
3. The process for producing airport road cement of claim 1, wherein: the fly ash comprises the following chemical components: a Loss content of 21.84 wt%, a silica content of 37.95 wt%, an alumina content of 25.77 wt%, an iron oxide content of 5.21 wt%, a calcium oxide content of 4.50 wt%, a magnesium oxide content of 0.61 wt%, a potassium oxide content of 0.62 wt%, a sodium oxide content of 0.18 wt% and an alkali content of 0.59 wt%.
4. The process for producing airport road cement of claim 1, wherein: the silica consists of the following chemical components: 0.95 wt% Loss, 91.97 wt% silica, 1.72 wt% alumina, 0.80 wt% iron oxide, 2.53 wt% calcium oxide, 0.81 wt% magnesium oxide, 0.09 wt% potassium oxide, 0.11 wt% sodium oxide and 0.17 wt% alkali.
5. The process for producing airport road cement of claim 1, wherein: the homogenized green powder consisted of the following chemical components: 13.30 wt% of silicon oxide, 3.13 wt% of aluminum oxide, 2.49 wt% of iron oxide, 42.02 wt% of calcium oxide, 2.00 wt% of magnesium oxide, 0.32 wt% of alkali and 0.15 wt% of sulfur trioxide.
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| CN112897911B (en) * | 2021-02-04 | 2023-07-11 | 中国葛洲坝集团水泥有限公司 | Curing agent for reducing leaching toxicity of manganese element in cement and method thereof |
| CN115231838B (en) * | 2022-07-29 | 2023-07-11 | 四川峨胜水泥集团股份有限公司 | Cement for cement concrete pavement of civil airport and preparation method thereof |
| CN115286267A (en) * | 2022-08-18 | 2022-11-04 | 河北鼎星水泥有限公司 | Low-alkali high-strength cement clinker and processing technology thereof |
| CN116143431A (en) * | 2022-12-06 | 2023-05-23 | 陕西富平生态水泥有限公司 | Method for preparing low-alkaline cement clinker by using clay |
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| CN102659326A (en) * | 2012-04-17 | 2012-09-12 | 新疆天山水泥股份有限公司 | Low-alkaline sulphur-resisting portland cement for road and production method thereof |
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