CN113526882A - A kind of Portland cement clinker and preparation method thereof - Google Patents
A kind of Portland cement clinker and preparation method thereof Download PDFInfo
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- CN113526882A CN113526882A CN202010287170.8A CN202010287170A CN113526882A CN 113526882 A CN113526882 A CN 113526882A CN 202010287170 A CN202010287170 A CN 202010287170A CN 113526882 A CN113526882 A CN 113526882A
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- slag
- cement clinker
- portland cement
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- coal gasification
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- 239000011398 Portland cement Substances 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000002893 slag Substances 0.000 claims abstract description 109
- 238000000034 method Methods 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000004568 cement Substances 0.000 claims abstract description 24
- 238000001354 calcination Methods 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 13
- 238000000227 grinding Methods 0.000 claims abstract description 11
- 239000005997 Calcium carbide Substances 0.000 claims abstract description 5
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims description 23
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052802 copper Inorganic materials 0.000 claims description 14
- 239000010949 copper Substances 0.000 claims description 14
- 239000010881 fly ash Substances 0.000 claims description 14
- 239000002699 waste material Substances 0.000 claims description 14
- 239000011363 dried mixture Substances 0.000 claims description 11
- 239000004575 stone Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 42
- 239000003245 coal Substances 0.000 abstract description 17
- 238000002309 gasification Methods 0.000 abstract description 11
- 238000000354 decomposition reaction Methods 0.000 abstract description 10
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 239000002440 industrial waste Substances 0.000 abstract description 5
- 235000012054 meals Nutrition 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- 239000002910 solid waste Substances 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 238000003912 environmental pollution Methods 0.000 abstract 1
- 238000000265 homogenisation Methods 0.000 abstract 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 11
- 229910052710 silicon Inorganic materials 0.000 description 11
- 239000010703 silicon Substances 0.000 description 11
- 239000007789 gas Substances 0.000 description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000010878 waste rock Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000005029 sieve analysis Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 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
- C04B7/24—Cements from oil shales, residues or waste other than slag
-
- 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
- C04B7/02—Portland cement
- C04B7/06—Portland cement using alkaline raw materials
-
- 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
- C04B7/434—Preheating with addition of fuel, e.g. calcining
-
- 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
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)
- Processing Of Solid Wastes (AREA)
Abstract
本发明涉及环境保护和工业废渣综合利用领域，具体涉及一种硅酸盐水泥熟料及其制备方法，该方法包括以下步骤：(1)将含水的煤气化渣和电石湿渣混合后烘干；(2)将步骤(1)所得的烘干混合物，与其他辅料配料后进行粉磨，得到生料；(3)将步骤(2)所得生料依次进行均化、预热、分解和煅烧，得到水泥熟料；其中，在步骤(1)中，以含水的煤气化渣和电石湿渣的总重量为100％计，所述含水的煤气化渣用量为2‑10重量％；在步骤(2)中，所述生料细度为16‑20％。本发明的优点体现在：(1)利用煤气化渣残碳量高的特点，燃烧时可以提高系统温度、降低系统能耗；(2)降低水泥熟料煅烧过程中氮氧化物的排放量；(3)充分消化煤气化渣固体废弃物，降低环境污染。The invention relates to the fields of environmental protection and comprehensive utilization of industrial waste residues, in particular to a Portland cement clinker and a preparation method thereof. The method comprises the following steps: (1) mixing water-containing coal gasification slag and calcium carbide wet slag and drying them (2) with the drying mixture of step (1) gained, carry out grinding after batching with other auxiliary materials, obtain raw meal; (3) carry out homogenization, preheating, decomposition and calcination successively with step (2) gained raw meal , to obtain cement clinker; wherein, in step (1), the total weight of the water-containing coal gasification slag and calcium carbide wet slag is 100%, and the water-containing coal gasification slag consumption is 2-10% by weight; in step In (2), the raw meal fineness is 16-20%. The advantages of the invention are: (1) Utilizing the characteristics of high residual carbon content of coal gasification slag, the temperature of the system can be increased and the energy consumption of the system can be reduced during combustion; (2) The emission of nitrogen oxides during the calcination of cement clinker can be reduced; (3) Fully digest coal gasification slag solid waste to reduce environmental pollution.
Description
Technical Field
The invention relates to the fields of environmental protection and comprehensive utilization of industrial waste residues, in particular to portland cement clinker and a preparation method thereof.
Background
In recent years, a batch of coal chemical enterprises are built in China, the production is put into operation successively, the yield is increased year by year, and clean comprehensive utilization of coal resources is formed in a certain scale. The coal gasification technology is one of the core contents of the clean coal technology and is an important direction for the utilization of coal resources and energy. With the development of the coal chemical industry, the coal gasification residues increase rapidly, but the coal gasification residues occupy the land when being stacked, and leachate of the coal gasification residues can pollute the soil and water sources. At present, the gasified slag is only used for building material raw materials, sintering materials of a circulating fluidized bed and high-added-value resource utilization except for landfill and open-air stacking, and related information for raw material batching in the cement industry relates to a little.
The related statistical data of the environmental protection department show that the emission of nitrogen oxides in the cement industry accounts for 10-12% of the total amount of the whole country, and is the third major emission source after thermal power plants and motor vehicles. How to reduce the emission of nitrogen oxides becomes a problem to be solved urgently in domestic cement enterprises.
At present, the patents of applying the gasified slag to the cement mainly include: (1) patent of the university of Hunan science and technology a method for preparing clinker-less cement by calcining coal gasification slag step by step (application No. 201810194030.9); (2) a method for preparing low clinker cement by suspension roasting coal gasification slag (application number 201810193878. X). The patent is capable of effectively utilizing the gasified slag in the cement preparation, and changing waste into valuable, but how to reduce the emission of nitrogen oxides generated by cement clinker calcination is not researched.
Disclosure of Invention
The invention aims to effectively utilize solid waste gas to gasify slag and reduce the discharge amount of nitrogen oxides generated by calcining cement clinker, and provides silicate cement clinker and a preparation method thereof.
In order to achieve the above object, an aspect of the present invention provides a method for preparing portland cement clinker, comprising the steps of:
(1) mixing the water-containing gasified slag and the wet carbide slag and then drying the mixture;
(2) mixing the dried mixture obtained in the step (1) with other auxiliary materials, and then grinding to obtain raw materials;
(3) homogenizing, preheating, decomposing and calcining the raw materials obtained in the step (2) in sequence to obtain cement clinker;
wherein in the step (1), the using amount of the water-containing gasified slag is 2-10 wt% based on 100% of the total weight of the water-containing gasified slag and the wet calcium carbide slag;
in the step (2), the fineness of the raw material is 16-20%.
Preferably, the water content of the water-containing gasified slag is 60-75 wt%.
Preferably, in the step (2), the other auxiliary materials comprise waste silica, fly ash, converter slag and copper slag.
Preferably, the mass ratio of the waste silicon stone to the fly ash to the converter slag to the copper slag is (1-5) to (1-20) to (1-5) to 1.
Preferably, in the step (2), the mass ratio of the dried mixture to other auxiliary materials is 1: 0.05-1.
Preferably, in the step (2), the pulverizing process is performed in a medium-discharge drying mill.
Preferably, in the step (3), the preheating is carried out in a rotary kiln preheater, and the preheating temperature is 500-600 ℃.
Preferably, in the step (3), the decomposition is carried out in a decomposition furnace, and the decomposition temperature is 800-.
Preferably, in step (3), the calcination is performed in a rotary kiln at a calcination temperature of 1400-1700 ℃.
In another aspect, the present invention provides a portland cement clinker prepared by the above method.
The ground raw material is mixed with high-temperature gas when entering the primary stage of the preheater system, and partial gasified slag is combusted to release heat so as to improve the gas temperature of the preheater, thereby reducing the energy consumption of the system. The rest gasified slag is continuously combusted in each stage of cyclone and the decomposing furnace, a large amount of carbon monoxide is generated in the preheater under the condition of insufficient oxygen so that the whole system forms a reducing atmosphere, and the gasified slag continuously reacts with nitrogen oxides in smoke gas from the kiln and the furnace to generate nitrogen gas under the condition of no catalyst in the descending process of the gasified slag, so that the discharge amount of the nitrogen oxides is reduced.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a preparation method of portland cement clinker, which comprises the following steps:
(1) mixing the water-containing gasified slag and the wet carbide slag and then drying the mixture;
(2) mixing the dried mixture obtained in the step (1) with other auxiliary materials, and then grinding to obtain raw materials;
(3) homogenizing, preheating, decomposing and calcining the raw materials obtained in the step (2) in sequence to obtain cement clinker;
wherein in the step (1), the using amount of the water-containing gasified slag is 2-10 wt% based on 100% of the total weight of the water-containing gasified slag and the wet calcium carbide slag;
In the step (2), the fineness of the raw material is 16-20%.
In a preferred embodiment, the water-containing gasified slag is added in an amount of 3-9 wt% based on 100 wt% of the total weight of the water-containing gasified slag and the wet carbide slag. Specifically, the addition amount of the water-containing gasified slag can be 3%, 4%, 5%, 6%, 7%, 8% or 9%.
In the process according to the invention, the water content of the aqueous gasified slag in step (1) is 60 to 75 wt.%, and preferably, for example, 60%, 65%, 68%, 70%, or 75%.
In the process according to the invention, in step (2), the fineness of the raw meal is 16 to 20%, and may preferably be 16%, 17%, 18%, 19% or 20%, for example. It should be noted here that the fineness measurement method is a sieve analysis method using a standard sieve with 80 μm square holes according to GB/T1345-.
In the method of the present invention, the other auxiliary materials in step (2) may be common general silicate industrial waste residues, and in a preferred case, may be one or any mixture of silicon waste rock, fly ash, converter slag, copper slag, coal slag and kiln dust, specifically, may be, for example, silicon waste rock, fly ash, converter slag and copper slag.
In the method, in the step (2), the mass ratio of the waste silicon stone, the fly ash, the converter slag and the copper slag is (1-5) to (1-20) to (1-5) to 1, and preferably, the mass ratio of the waste silicon stone, the fly ash, the converter slag and the copper slag is (1-4) to (1-10) to (1-4) to 1, and more preferably, the mass ratio of the waste silicon stone, the fly ash, the converter slag and the copper slag is (2-4) to (2-10) to (2-4) to 1.
In the method of the present invention, the mass ratio of the dried mixture in the step (2) to other auxiliary materials is 1: 0.05-1, and preferably 1: 0.1-0.5, specifically, 1: 0.1, 1: 0.2, 1: 0.3, 1: 0.4 or 1: 0.5.
In the method, the grinding treatment in the step (2) is carried out in a middle-discharge drying mill.
In the method of the present invention, in the step (3), the preheating is performed in a rotary kiln preheater, and the preheating temperature is 500-.
In the method of the present invention, in the step (3), the decomposition is performed in a decomposition furnace, and the decomposition temperature is 800-1000 ℃, specifically, for example, 800 ℃, 850 ℃, 900 ℃, 950 ℃ or 1000 ℃. The time for the decomposition is not particularly limited as long as the raw meal reaches the decomposition temperature. In a specific embodiment, the time of decomposition is greater than 4.5 seconds.
In the method of the present invention, in the step (3), the calcination is performed in a rotary kiln, and the calcination temperature is 1400-1700 ℃, specifically, for example, 1400 ℃, 1500 ℃, 1550 ℃, 1600 ℃, 1650 ℃ or 1700 ℃. The calcination time is not particularly limited as long as the raw material can be brought to the calcination temperature. In a specific embodiment, the time of the calcination is greater than 15 minutes.
In another aspect, the present invention provides a portland cement clinker prepared by the above method.
In the invention, the ground raw material can fully react in the system to generate heat and carbon monoxide due to proper granularity. When raw materials enter the primary stage of the preheater system, the raw materials are mixed with high-temperature gas, and part of the gas is gasified and slagged to be combusted to release heat so as to improve the temperature of the gas of the preheater, thereby reducing the energy consumption of the system. The rest gasified slag is continuously combusted in each stage of cyclone and the decomposing furnace, a large amount of carbon monoxide is generated in the preheater under the condition of insufficient oxygen so that the whole system forms a reducing atmosphere, and the gasified slag continuously reacts with nitrogen oxides in smoke gas from the kiln and the furnace to generate nitrogen gas under the condition of no catalyst in the descending process of the gasified slag, so that the discharge amount of the nitrogen oxides is reduced.
The invention skillfully combines the industrial waste residue gasified slag and the portland cement calcined nitrogen oxide, on one hand, the gasified slag is used as the cement raw material to consume the industrial waste residue, on the other hand, the gasified slag is added, and the characteristic of high carbon residue of the gasified slag is utilized, so that the system temperature can be increased, the system energy consumption can be reduced during combustion, the discharge amount of the portland cement calcined nitrogen oxide can be effectively reduced, the waste is changed into valuable, the energy consumption is reduced, the nitrogen oxide emission is reduced, and the environmental protection is facilitated.
The present invention will be described in detail below by way of examples, but the scope of the present invention is not limited thereto.
Example 1
Taking the gasified slag with the water content of 70 percent, adding the gasified slag with the water content of 6 percent, mixing the gasified slag with the wet carbide slag, and drying the mixture; taking the dried mixture of the gasified slag and the carbide slag, and mixing the mixture with other auxiliary materials according to the mass ratio of 1: 0.2, grinding, wherein the mass ratio of the waste silicon stones to the fly ash to the converter slag to the copper slag is 3: 9: 3: 1; the raw material with the fineness of 18 percent is sequentially preheated at 540 ℃, decomposed at 900 ℃ and calcined at 1500 ℃ to obtain cement clinker A1.
Example 2
Taking the gasified slag with the water content of 68 percent, adding the gasified slag with the water content of 3 percent, mixing the gasified slag with the wet carbide slag, and drying the mixture; taking the dried mixture of the gasified slag and the carbide slag, and mixing the mixture with other auxiliary materials according to the mass ratio of 1: 0.2, grinding, wherein the mass ratio of the waste silicon stones to the fly ash to the converter slag to the copper slag is 4: 8: 3: 1; the raw material with the fineness of 16 percent is sequentially preheated at 560 ℃, decomposed at 1000 ℃ and calcined at 1400 ℃ to obtain cement clinker A2.
Example 3
Taking the gasified slag with the water content of 75 percent, adding the gasified slag with the addition of 7 percent, mixing the gasified slag with the wet carbide slag, and drying the mixture; taking the dried mixture of the gasified slag and the carbide slag, and mixing the mixture with other auxiliary materials according to the mass ratio of 1: 0.3, grinding, wherein the mass ratio of the waste silicon stones to the fly ash to the converter slag to the copper slag is 3: 8: 4: 1; the raw material with the fineness of 20 percent is sequentially preheated at 580 ℃, decomposed at 900 ℃ and calcined at 1600 ℃ to obtain cement clinker A3.
Example 4
Taking the gasified slag with the water content of 60 percent, adding 8 percent of the gasified slag, mixing the gasified slag with the wet carbide slag, and drying the mixture; taking the dried mixture of the gasified slag and the carbide slag, and mixing the mixture with other auxiliary materials according to the mass ratio of 1: 0.5, grinding, wherein the mass ratio of the waste silicon stones to the fly ash to the converter slag to the copper slag is 2: 10: 2: 1; the raw material with the fineness of 17 percent is sequentially preheated at 600 ℃, decomposed at 900 ℃ and calcined at 1650 ℃ to obtain cement clinker A4.
Example 5
Taking the gasified slag with the water content of 60 percent, adding the gasified slag with the water content of 9 percent, mixing the gasified slag with the wet carbide slag, and drying the mixture; taking the dried mixture of the gasified slag and the carbide slag, and mixing the mixture with other auxiliary materials according to the mass ratio of 1: 0.1, grinding, wherein the mass ratio of the waste silicon stone, the fly ash, the converter slag and the copper slag is 4: 5: 4: 1; the raw material with the fineness of 19 percent is sequentially preheated at 500 ℃, decomposed at 800 ℃ and calcined at 1700 ℃ to obtain the cement clinker A5.
Example 6
A cement clinker A6 was obtained by the method of example 1, except that the amount of the gasified slag was 1%.
Comparative example 1
In contrast to cement clinker D1, which was prepared according to the method of example 1, in this comparative example no gasified slag was added, and the added amount of gasified slag was entirely replaced by dried carbide slag.
Test example
The nitrogen oxide emission concentrations of examples 1 to 6 and comparative example 1 were measured according to the method described in HJ/T76-2007, and the results are shown in Table 1:
TABLE 1
The results in table 1 show that the cement clinker prepared by the method of the present invention has significantly reduced emission concentration of nitrogen oxides during calcination and significant effect compared with the cement clinker prepared from raw materials without gas slagging.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. A method for preparing portland cement clinker, characterized by comprising the steps of:
(1) mixing the water-containing gasified slag and the wet carbide slag and then drying the mixture;
(2) mixing the dried mixture obtained in the step (1) with other auxiliary materials, and then grinding to obtain raw materials;
(3) homogenizing, preheating, decomposing and calcining the raw materials obtained in the step (2) in sequence to obtain cement clinker;
wherein in the step (1), the using amount of the water-containing gasified slag is 2-10 wt% based on 100% of the total weight of the water-containing gasified slag and the wet calcium carbide slag; in the step (2), the fineness of the raw material is 16-20%.
2. The method for producing portland cement clinker according to claim 1, wherein in step (1), the moisture content of the hydrated gasified slag is 60 to 75 wt%.
3. The method for preparing portland cement clinker according to claim 1, wherein in step (2), the other auxiliary materials comprise waste silica, fly ash, converter slag and copper slag.
4. The method for preparing the portland cement clinker according to claim 3, wherein the mass ratio of the waste silica stone to the fly ash to the converter slag to the copper slag is (1-5) to (1-20) to (1-5) to 1.
5. The method for preparing portland cement clinker according to claim 1, wherein in step (2), the mass ratio of the dried mixture to other auxiliary materials is 1: 0.05-1.
6. The method for producing portland cement clinker according to claim 1, wherein in step (2), the grinding is performed in a medium-discharge type drying mill.
7. The method as claimed in claim 1, wherein said preheating in step (3) is carried out in a rotary kiln preheater at a preheating temperature of 500-600 ℃.
8. The method as claimed in claim 1, wherein said decomposing in step (3) is carried out in a decomposing furnace at a decomposing temperature of 800-1000 ℃.
9. The method as claimed in claim 1, wherein said calcination is carried out in a rotary kiln at a calcination temperature of 1400 ℃ to 1700 ℃ in step (3).
10. Portland cement clinker produced according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010287170.8A CN113526882B (en) | 2020-04-13 | 2020-04-13 | Portland cement clinker and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010287170.8A CN113526882B (en) | 2020-04-13 | 2020-04-13 | Portland cement clinker and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN113526882A true CN113526882A (en) | 2021-10-22 |
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| CN114656173A (en) * | 2022-03-03 | 2022-06-24 | 冀东水泥(烟台)有限责任公司 | Method for producing cement clinker by using gasified slag |
| CN116573869A (en) * | 2023-05-26 | 2023-08-11 | 安徽建筑大学 | Method for producing cement clinker by using slag waste |
| CN116589208A (en) * | 2023-05-18 | 2023-08-15 | 临汾山水水泥有限公司 | A kind of cement clinker and its preparation process |
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