CN113354311A - Resource-saving low-carbon cement clinker and preparation method thereof - Google Patents
Resource-saving low-carbon cement clinker and preparation method thereof Download PDFInfo
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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
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
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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
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
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- 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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Abstract
The invention discloses a resource-saving low-carbon cement clinker and a preparation method thereof, belonging to the technical field of production of silicate cement clinker, wherein the cement clinker comprises the following raw materials in percentage by mass: 45-70% of high-calcium low-magnesium limestone, 10-40% of waste stone, 4-12% of shale or sandstone, 4-12% of furnace slag, 1-3% of sulfate slag or iron slag, 1-3% of fly ash, 0-3% of coal slag or coal gangue, 0.5-3% of phosphorous slag and phosphogypsum, and 0.1-0.3% of an activating agent. The invention makes use of a large amount of solid waste, the adopted industrial waste residue is almost free of carbonate due to high-temperature calcination, and CO is hardly generated after high-temperature calcination again2(ii) a The industrial waste residue has high mixing amount, greatly reduces the limestone consumption, utilizes the mineralization of trace elements in the industrial waste residue, and is added with an activator, thereby being beneficial to improving the easy burning property of raw materials, reducing the burning stability of clinker, and improving the performance of the clinkerThe firing temperature of the clinker is reduced by 100-150 ℃ compared with the firing temperature of 1450 ℃ of the traditional silicate cement clinker, the coal consumption is obviously reduced, and CO is reduced2The amount of discharge of (c).
Description
Technical Field
The invention relates to the technical field of production of portland cement clinker, in particular to resource-saving low-carbon cement clinker and a preparation method thereof.
Background
Climate change has becomeThe most important environmental problem worldwide. Carbon dioxide abatement has also become a globally recognized important measure to address climate change and to mitigate global warming. The industrial field consumes one third of energy in the world, discharges about 40% of carbon dioxide, and is a focus industry for paying attention to carbon dioxide emission reduction. The cement industry is the most important carbon dioxide emission department in the industrial field, faces increasingly severe environmental protection pressure, and the carbon dioxide emission reduction of the cement industry is imperative. Clinker is the most important and indispensable raw material for producing building materials (cement). The existing cement clinker preparation method is that limestone, clay (shale), sandstone and iron ore which are mined in mines are ground into raw meal according to a proper proportion, and the raw meal is preheated, decomposed, calcined and cooled to obtain the silicate cement clinker which takes calcium silicate as a main mineral component. For example, chinese patent No. CN201610668137.3 discloses a portland cement clinker, which comprises: 83-86% of limestone, 1.5-2.5% of iron ore, 3-5% of coal gangue, 6-8% of clay and 1-3% of silica sand, wherein SiO is formed by controlling the mixing of the raw materials210-15% of the total mass, Al2O32.5-3.5% of the total mass, Fe2O3Accounting for 1.2-2.0% of the total mass, and CaO accounting for 40-45% of the total mass. Because a large amount of non-renewable mineral resources such as limestone are consumed, the method has the problems of large resource consumption, high energy consumption, high production cost and the like, and simultaneously, a large amount of CO is released by the decomposition of the calcareous raw material limestone2，CO2The emission is large, and the method does not accord with the policy of green and low-carbon development of the industry. Therefore, the cement clinker preparation process is optimized, the decomposition of calcareous raw materials is reduced, and the CO generated by fuel combustion is reduced2The discharge amount is of great significance. Meanwhile, a large amount of discharged soil slag, low-grade waste stone and the like exist in peripheral mines such as Huangshi Yanxin and the like, a large amount of waste slag is accumulated nearby chemical industry, power plants, steel enterprises and the like, the waste stone and the waste slag cannot be effectively treated, land occupation is realized, environmental pollution is caused, and proper treatment is urgently needed.
Disclosure of Invention
The invention aims at the existing technical problems, develops a resource-saving low-carbon cement clinker and providesProvides a preparation method of the cement clinker; the industrial waste residue adopted by the invention is formed by high-temperature calcination, so that carbonate hardly exists, and CO hardly generates after high-temperature calcination again2(ii) a The industrial waste residue is high in mixing amount, the limestone consumption is greatly reduced, the mineralization effect of trace elements in the industrial waste residue is utilized, an activator is added, the improvement of the easy burning property of raw materials is facilitated, the burning stability of clinker is reduced, the performance of the clinker is improved, the burning temperature of the low-carbon cement clinker is reduced by 100-150 ℃ compared with the burning temperature of 1450 ℃ of the traditional portland cement clinker, the coal consumption is obviously reduced, and CO is reduced2The amount of discharge of (c).
The technical purpose of the invention is realized by the following technical scheme:
a resource-saving low-carbon cement clinker comprises the following raw materials in percentage by mass: 45-70% of high-calcium low-magnesium limestone, 10-40% of waste stone, 4-12% of shale or sandstone, 4-12% of furnace slag, 1-3% of sulfate slag or iron slag, 1-3% of fly ash, 0-3% of coal slag or coal gangue, 0.5-3% of phosphorous slag and phosphogypsum and 0.1-0.3% of activating agent.
Adopt above-mentioned technical scheme: the invention takes the high-calcium low-magnesium limestone and the waste stone as main materials and matches with various industrial waste residues, wherein the waste stone and the slag have high calcium oxide content and are used as low-grade limestone and matched with the high-calcium low-magnesium limestone, so that the consumption of high-quality limestone can be reduced; shale or sandstone is used as clay raw material to provide high-content and high-activity SiO2Is easy to react with calcium oxide, and the iron slag or the sulfate slag as an iron correcting material can provide high-activity Fe2O3The fly ash and the cinder are used as aluminum correction materials, the phosphorous slag and the phosphogypsum are used as auxiliary cementing materials, and a functional material with the main component of organic acid salt is added as an activating agent, so that the characteristics of grinding aid, catalysis promotion of clinker sintering and the like are achieved, and tricalcium silicate (C) is ensured together3S), dicalcium silicate (C)2S), (tricalcium aluminate) C3A. Tetra calcium aluminoferrite (C)4AF) generation of the fraction.
In the process of calcining cement clinker, furnace slag, sulfuric acid slag, coal slag, fly ash, phosphogypsum and the like are processedThe industrial waste residue calcined at high temperature has the advantages that the mineral phase barrier contained in the industrial waste residue is weak, the burnability is good, the appearance of a liquid phase is early, the eutectic temperature of a reaction system can be reduced, the liquid phase in a reaction zone is advanced, the calcination temperature is reduced by 150-200 ℃, and the promotion of the belite cement mineral C is facilitated at a lower calcination temperature2Production of S, increasing C2The content of S reduces the lime saturation coefficient; meanwhile, the slag, the sulfate slag, the fly ash and the cinder contain C2S can adsorb calcium oxide and promote C2Conversion of S to C3S, so that the clinker minerals have high C content at the same time2S and C3And S, ensuring the early strength and the later strength to improve the strength grade. The addition of phosphogypsum to regulate the sulfur-alkali ratio of clinker is favorable for improving early strength, and can generate minerals with higher early strength, such as sulphoaluminate-calcium sulphoaluminate and dodecacalcium heptaluminate, at the temperature of about 1200 ℃ for compensating C2The influence of increased S content on early strength. Secondly, the phosphorus slag, the furnace slag, the sulfuric acid slag and other industrial waste residues contain trace elements such as germanium, scandium, magnesium, gallium, vanadium and the like, and the transition metal ions can be dissolved in C3S、C2S and other minerals stabilize the high-temperature phase and cause the mineral crystal lattice to generate defects so as to ensure that the mineral crystal lattice is incomplete, thereby improving the hydration activity of the minerals and further improving the strength of the low-carbon cement clinker. Furthermore, the industrial waste residue is generated by high-temperature calcination, and CaO is mostly in a free state or Ca (OH)2Even if the silicate, aluminate and the like with similar composition to the cement clinker exist, carbonate hardly exists, and CO hardly generates after high-temperature calcination again2(ii) a Moreover, the industrial waste residue is high in mixing amount, the dosage of limestone is greatly reduced, and CO released in the process of calcining and decomposing clinker is reduced2An amount; and lower calcination temperature results in lower coal consumption and CO discharged from the coal2The amount is reduced, so the low-carbon cement clinker can reduce the emission of CO by more than 20 percent2Amount of the compound (A).
Further, the material comprises the following raw materials in percentage by mass: 50-60% of high-calcium low-magnesium limestone, 17.8-27.8% of waste stone, 8% of shale, 7% of furnace slag, 2% of iron slag, 2% of fly ash, 1% of coal slag, 1% of phosphorus slag, 1% of phosphogypsum and 0.2% of activating agent.
Further, the composite material comprises the following components in percentage by mass: 55% of high-calcium low-magnesium limestone, 22.8% of waste stone, 8% of shale, 7% of furnace slag, 2% of iron slag, 2% of fly ash, 1% of coal slag, 1% of phosphorous slag, 1% of phosphogypsum and 0.2% of activating agent.
Furthermore, the high-calcium low-magnesium limestone has the MgO content of less than 1.5%, the CaO content of more than 50% and the silicon content of less than 4.0.
Further, the waste stones comprise high-magnesium waste stones, high-silicon waste stones and high-sulfur waste stones, and the CaO content of the waste stones is 35% -46%; the MgO content of the high-magnesium waste stone is 3% -6%, and the SiO content of the high-silicon waste stone is2The content of the high-sulfur waste stone is 10% -20%, and the sulfur content of the high-sulfur waste stone is 0.4% -1.0%.
Further, the SiO of the shale260 to 80 percent of Al2O3The content is not less than 8 percent; SiO of sandstone2More than 75% of Al2O3The content is less than 8 percent.
Further, the slag is one or more of electric furnace slag or converter slag.
Further, the main chemical component of the electric furnace slag or the converter slag is silicon dioxide (SiO)2) Aluminum oxide (Al)2O3) Calcium oxide (CaO), magnesium oxide (MgO), iron oxide (Fe)2O3) Wherein the CaO content of the electric furnace slag is more than 35 percent, and Fe2O3The content is more than 15 percent; the CaO content of the converter slag is more than 40 percent, and Fe2O3The content is less than 10 percent.
Further, the main component of the pyrite cinder is ferric oxide (Fe)2O3) And sulfur trioxide (SO)3) The main component of the iron slag is iron oxide (Fe)2O3) Wherein, Fe2O3The content is more than 50 percent.
Further, the main component of the phosphogypsum is calcium sulfate (CaSO)4.2H2O); the main component of the phosphorous slag is silicon dioxide (SiO)2) Calcium oxide (CaO), wherein CThe aO content is more than 40 percent.
Further, the main component of the fly ash and the coal cinder is silicon dioxide (SiO)2) Aluminum oxide (Al)2O3) Calcium oxide (CaO), magnesium oxide (MgO), iron oxide (Fe)2O3) And part has a certain heat value.
The preparation method of the resource-saving low-carbon cement clinker comprises the following steps:
s1, weighing the raw materials, mixing, drying and grinding the raw materials according to the weight percentage to obtain mixed fine powder A with 80 mu m of screen residue less than 15 percent and 200 mu m of screen residue less than 1.5 percent;
s2, calcining the mixed powder A at 1300-1350 ℃ for 30-60 min, and cooling to obtain cement clinker B.
The loss on ignition of the cement clinker B obtained by adopting the technical scheme is less than 0.3 percent, the free calcium oxide is less than 1.0 percent, the lime saturation coefficient (KH) is 0.88-0.92, the silicic acid rate (n) is 2.35-2.55, the aluminum oxide rate (p) is 1.50-1.70, and the MgO is less than 3.5 percent. The physical property is that the compressive strength is more than 32MPa in 3 days and more than 58MPa in 28 days.
Compared with the prior art, the invention has the following advantages:
1. the industrial waste residue adopted by the invention is formed by high-temperature calcination, so that carbonate hardly exists, and CO hardly generates after high-temperature calcination again2(ii) a Moreover, the mixing amount of the industrial waste residue is high, the consumption of limestone is greatly reduced, and the firing temperature of the low-carbon cement clinker is reduced by 100-150 ℃ compared with the firing temperature of 1450 ℃ of the traditional silicate cement clinker, so that the energy consumption is reduced, and CO is reduced2The amount of emissions is greatly reduced.
2. The industrial waste residue is matched with the high-calcium low-magnesium limestone and the waste stone, the mineral phase barrier contained in the industrial waste residue is weak, the burnability is good, the eutectic temperature of a calcination system can be reduced by 150-200 ℃, the liquid phase of a reaction zone is advanced, and C is promoted2S is generated, and C contained in the slag, the sulfate slag and the fly ash is generated2S can adsorb CaO and promote C2Conversion of S to C3S, so that the clinker minerals have high C content at the same time2S and C3And S, reducing the lime saturation coefficient to a certain extent, and ensuring the early strength and the later strength.
3. The invention utilizes the mineralization of trace metal elements in the phosphorous slag to cause mineral crystal lattices to generate defects and the crystal of the mineral lattices to be incomplete, thereby improving the hydration activity of the minerals; the addition of the phosphogypsum can adjust the sulfur-alkali ratio of clinker, can also generate minerals with higher early strength at the temperature of about 1200 ℃, and the addition of a functional material as an activating agent is beneficial to improving the solid phase reaction and the sintering rate of the clinker, so that the low-carbon cement clinker sintered at lower temperature still has higher early strength and later strength.
4. According to the invention, a large amount of industrial waste residues are used for replacing limestone, so that the recycling capability of the industrial waste residues is greatly improved, the industrial waste residues are favorably and rapidly consumed, the utilization rate of limestone resources is improved, and the cost is saved.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
According to the previous test, the types of shale or sandstone, electric furnace slag or converter slag and coal slag or coal gangue have little influence on the effect of the invention, so in the following examples, the test is performed by using shale, electric furnace slag and coal slag as raw materials. Table 1 shows the raw materials and their ratios of the resource-saving low-carbon cement clinker.
TABLE 1 raw materials of resource-saving low-carbon cement clinker and their ratio (%)
The properties of the raw materials in table 1 are as follows:
the high-calcium low-magnesium limestone has MgO content less than 1.5%, CaO content more than 50% and silicon content less than 4.0.
The waste rock comprises high-magnesium waste rock, high-silicon waste rock and high-sulfur waste rock in a mass ratio of 1:1:1, wherein the CaO content of the waste rock is 35-46%; the MgO content of the high-magnesium waste stone is 3% -6%, and the SiO content of the high-silicon waste stone is2The content of the high-sulfur waste stone is 10% -20%, and the sulfur content of the high-sulfur waste stone is 0.4% -1.0%.
SiO of the shale260 to 80 percent of Al2O3The content is not less than 8 percent; SiO of sandstone2More than 75% of Al2O3The content is less than 8 percent.
The main chemical component of the slag is silicon dioxide (SiO)2) Aluminum oxide (Al)2O3) Calcium oxide (CaO), magnesium oxide (MgO), iron oxide (Fe)2O3) Wherein, the CaO content is 35 percent to 45 percent, and Fe2O3The content is 3-25%.
The main component of the pyrite cinder is ferric oxide (Fe)2O3) And sulfur trioxide (SO)3) The main component of the iron slag is iron oxide (Fe)2O3) Wherein, Fe2O3The content is more than 50 percent.
The main component of the phosphogypsum is calcium sulfate (CaSO)4.2H2O), the main component of the phosphorous slag is silicon dioxide (SiO)2) And calcium oxide (CaO), wherein the CaO content is more than 40%.
The main component of the fly ash and the cinder is silicon dioxide (SiO)2) Aluminum oxide (Al)2O3) Calcium oxide (CaO), magnesium oxide (MgO), iron oxide (Fe)2O3) And part has a certain heat value.
The activating agent is purchased from lake Nanchangdi environmental science and technology Limited, and mainly comprises a mixture of organic acid salt, polyhydric alcohol, alcohol amine and ester, wherein the relative density is 1.1-1.3, and the pH value is more than 9.
The preparation method of the resource-saving low-carbon cement clinker comprises the following steps:
s1, weighing raw materials, mixing and drying the raw materials according to the weight percentage, grinding the raw materials into raw material powder in a raw material mill, preheating and decomposing the raw material powder in a raw material homogenizing warehouse through a cyclone preheater to obtain mixed fine powder A with 80 mu m screen residue less than 15 percent and 200 mu m screen residue less than 1.5 percent; wherein, the sandstone and the shale in the raw materials are stacked according to the quality, are pre-homogenized for standby after being crushed according to the requirement, and the coal is stacked according to the quality and is pre-homogenized for standby;
s2, placing the mixed powder A in a rotary kiln, calcining for 30-60 min at 1300-1350 ℃, and entering a cooling machine for rapid cooling after clinker calcining is completed to obtain cement clinker B.
The method is applied to a novel dry-process clinker production line, the scale of the production line is 4000-10000 t/d, the raw material mill adopts a vertical roller mill, and the preheater is more than five grades. The heat recovered by the preheater and the cooler is used for generating power, and the power generation capacity of the recovered waste heat is more than 28KWh per ton of clinker.
Cement clinker performance measurement of application example
Magnesium oxide, free calcium oxide, loss on ignition and rate value determination: the determination is carried out according to the GB/T176-2017 standard;
compressive strength: refer to the relevant specifications for physical properties in "GBT 21372-2008 portland cement clinker" and test it according to GB/T17671-1999 standard.
Unit of CO2Discharge amount/t clinker: reference (Wanlan. CO of cement manufacturing company2Calculation of emissions [ J]Chinese cement, 2009(11): 21-22).
TABLE 2 determination of Cement Clinker Properties
As can be seen from Table 2, the high-calcium low-magnesium limestone and the waste stone are mainly used and are matched with various industrial residues, the production requirement of cement clinker can be met, the compressive strength of the produced clinker is high, and CO is generated2Has obvious emission reduction effect, and reduces CO compared with common Portland cement2Discharging more than 20%. Analysis of the data of examples 1-7 shows that the clinker strength gradually increases with increasing high-calcium low-magnesium limestone content, because the increased high-calcium low-magnesium limestone results in a large increase in calcium oxide content, and calcium oxide reacts with silica in the liquid phase to form C2S and C3S、C3A、C4AF and other components improve the saturation coefficient of limestone and are beneficial to improving the strength, but when the saturation coefficient is further increased to the content of the components in examples 6-7, CO is caused2The emission is greatly increased, and the strength increment is not obvious, so that the high-calcium low-magnesium limestone is preferably added in an amount of 50-60% in comprehensive consideration. Accordingly, when the amount of the limestone material such as high-calcium low-magnesium limestone and waste rock is greatly different from the amount of the shale, for example, the amount of the shale is low (example 2), so that the silicate mineral (C)2S and C3S) is low, and the solvent mineral (C)3A and C4AF) is too high, resulting in increased liquid phase viscosity, hindering absorption of free calcium oxide and C3S generation, resulting in a decrease in intensity; the addition of shale is high (example 7), the silicate mineral (C) in the clinker2S and C3S) is high, strength is good, but sintering difficulty is increased.
Analysis of the data of examples 3-4 and comparative example 1 shows that the early strength is improved as the doping amount of the phosphogypsum is increased.
Analysis of the data from example 5 and comparative example 2 revealed that the CO unit is present2The discharge amount is reduced, but the waste rock is replaced by the slag in the comparative example 2, so that the raw material cost is increased, and on the other hand, the metal oxide and trace elements in the carbide slag are more, so that the system has more liquid phase, is easy to agglomerate, the sintering range is narrowed, the clinker is not favorable for calcining, and the strength of the clinker is reduced to a certain degree.
As can be seen from the analysis of the data in example 5 and comparative example 3, the f-CaO content of the clinker sample doped with the cinder and the fly ash is obviously reduced, the burnability is good, and the cinder and the fly ash begin to melt at a lower temperature along with the increase of the temperature, so that the liquid phase quantity is increased, and the liquid phase point in the clinker is increasedPre-forming to form eutectic and benefit C2S resorption of f-CaO to form C3S, the development of early strength is facilitated. Comparative example 3 No coal cinder and fly ash are added, and the unit energy consumption is increased and the unit CO is increased under the condition of higher firing temperature2The discharge amount is greatly increased, and although the lime saturation coefficient is high, the early strength is not ideal.
The invention has the advantages of reasonable matching of various raw materials, good easy burning of clinker and guarantee of C2S and C3The S content is higher at the same time, the lime saturation coefficient is slightly lower than that of the ordinary portland cement, and the phosphogypsum is added to increase the early strength to obtain the compressive strength and CO2Cement clinker with good emission reduction effect; the compressive strength is more than 32MPa in 3 days, and the compressive strength is more than 58MPa in 28 days; the unit comprehensive energy consumption of the cement clinker is lower than 95kg ce/t clinker and the unit CO2The emission is less than 760kg CO2The amount of consumed natural resources of the clinker is less than 1000kg limestone/t clinker, while the traditional cement clinker consumes 1250 kg-1400 kg limestone per ton; are far lower than the technical indexes of the traditional cement clinker preparation method. Namely, the cement clinker has all indexes completely meeting the standard requirements of the universal cement clinker in the GB/T21372-2008 Portland cement clinker through inspection.
Claims (10)
1. The resource-saving low-carbon cement clinker is characterized by comprising the following raw materials in percentage by mass: 45-70% of high-calcium low-magnesium limestone, 10-40% of waste stone, 4-12% of shale or sandstone, 4-12% of furnace slag, 1-3% of sulfate slag or iron slag, 1-3% of fly ash, 0-3% of coal slag or coal gangue, 0.5-3% of phosphorous slag and phosphogypsum and 0.1-0.3% of activating agent.
2. The resource-saving low-carbon cement clinker of claim 1, which comprises the following raw materials in percentage by mass: 50-60% of high-calcium low-magnesium limestone, 17.8-27.8% of waste stone, 8% of shale, 7% of furnace slag, 2% of iron slag, 2% of fly ash, 1% of coal slag, 1% of phosphorous slag, 1% of phosphogypsum and 0.2% of activating agent.
3. The resource-saving low carbon cement clinker of claim 2, comprising in mass percent: 55% of high-calcium low-magnesium limestone, 22.8% of waste stone, 8% of shale, 7% of furnace slag, 2% of iron slag, 2% of fly ash, 1% of coal slag, 1% of phosphorous slag, 1% of phosphogypsum and 0.2% of activating agent.
4. The resource-saving low carbon cement clinker of claim 1, wherein the high calcium low magnesium limestone has an MgO content of less than 1.5%, a CaO content of more than 50%, and a Si content of less than 4.0.
5. The resource-saving low carbon cement clinker of claim 1, wherein the waste rock comprises high magnesium waste rock, high silicon waste rock and high sulfur waste rock, and the CaO content of the waste rock is 35-46%;
the MgO content of the high-magnesium waste stone is 3% -6%, and the SiO content of the high-silicon waste stone is2The content of the high-sulfur waste stone is 10% -20%, and the sulfur content of the high-sulfur waste stone is 0.4% -1.0%.
6. The resource-saving low carbon cement clinker of claim 1, wherein the SiO of the shale is260 to 80 percent of Al2O3The content is more than 8 percent;
SiO of sandstone2More than 75% of Al2O3The content is less than 8 percent.
7. The resource-saving low carbon cement clinker of claim 1, wherein the slag is one or more of electric furnace slag or converter slag.
8. The resource-saving low carbon cement clinker of claim 1, wherein the CaO content of the electric furnace slag is greater than 35%, and Fe2O3The content is more than 15 percent; the CaO content of the converter slag is more than 40 percent, and Fe2O3The content is less than 10 percent.
9. The method of claim 1The resource-saving low-carbon cement clinker is characterized in that the iron slag and the sulfate slag contain Fe2O3The content is more than 50 percent.
10. The method for preparing resource-saving low-carbon cement clinker as claimed in claim 1, characterized by comprising the steps of:
s1, weighing the raw materials, mixing, drying and grinding the raw materials according to the weight percentage to obtain mixed fine powder A with 80 mu m of screen residue less than 15 percent and 200 mu m of screen residue less than 1.5 percent;
s2, calcining the mixed powder A at 1300-1350 ℃ for 30-60 min, and cooling to obtain cement clinker B.
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| CN113955958A (en) * | 2021-12-08 | 2022-01-21 | 湖南先锋防水科技有限公司 | Environment-friendly high-strength cement and preparation method thereof |
| CN114538809A (en) * | 2022-02-25 | 2022-05-27 | 安徽海螺集团有限责任公司 | Application of pulverized fuel ash with calorific value |
| CN115180846A (en) * | 2022-07-13 | 2022-10-14 | 华新水泥股份有限公司 | Process for preparing calcium sulphoaluminate modified portland cement clinker by phosphogypsum desulfurization |
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| CN116553841B (en) * | 2023-04-18 | 2024-05-07 | 河南理工大学 | Carbon-cured low-calcium high-magnesium clinker and preparation method and application thereof |
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