CN110845159A - Preparation method for producing portland cement clinker by coal gangue - Google Patents
Preparation method for producing portland cement clinker by coal gangue Download PDFInfo
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- 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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- 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
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Abstract
The invention discloses a preparation method for producing portland cement clinker by coal gangue, which comprises limestone, river channel silt, converter slag and coal gangue; 77-80% of limestone raw material, 13-16% of river channel silt raw material, 5-7% of converter slag raw material and 0-5% of coal gangue raw material; the scheme of producing silicate cement clinker by using coal gangue ingredients is characterized in that the coal gangue is an oxygen-enriched mineral containing a plurality of trace elements such as sulfur, aluminum, iron and the like, the crystal phase potential barrier of the minerals is weak, oxygen can be rapidly released when the temperature is over 800 ℃ in the high-speed heating process, and the released oxygen just plays a role in depolymerizing a [ SiO4] -4 reaction active body in a cement raw material, so that the burning of the clinker is effectively promoted, meanwhile, a large amount of trace elements in the coal gangue also contribute to the early appearance of a clinker liquid phase, the melting point of the substances is effectively reduced, and the generation of the clinker is further promoted.
Description
Technical Field
The invention belongs to the technical field of producing portland cement clinker by using coal gangue, and particularly relates to a preparation method of producing portland cement clinker by using coal gangue.
Background
The coal gangue is solid waste discharged in the coal mining process and the coal washing process, and is a black grey rock which has lower carbon content and is harder than coal and is associated with a coal bed in the coal forming process; the main components of the clay are similar to those of clay, mainly comprising silicon dioxide and aluminum oxide, and additionally containing a small amount of iron oxide, calcium oxide, magnesium oxide, sodium oxide, potassium oxide, phosphorus pentoxide, sulfur trioxide and trace rare elements; at present, coal gangue is industrial waste residue with the largest annual discharge amount and accumulated storage amount in China, the coal gangue is abandoned without occupying a large area of land, and sulfide contained in the coal gangue escapes or is leached out to pollute the atmosphere, farmlands and water bodies; therefore, the research and application of the coal gangue have very important social significance, as the coal gangue has chemical components similar to clay and the clay which is a commonly adopted raw material in the cement production, the reaction activation energy of the clay is higher, so that the energy consumption of the cement is overhigh, and the exploitation of the clay damages vegetation and destroys fields, so that many developed countries forbid the use of the clay for firing the cement; therefore, the research on the application of the coal gangue as a production raw material to the production of the portland cement clinker not only accords with the national industrial policy of resource recycling and protects the environment, but also can save energy, reduce emission and reduce cost for cement enterprises, change waste into valuable and has important economic and social benefits.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a preparation method for producing portland cement clinker by using coal gangue.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method for producing portland cement clinker by coal gangue comprises limestone, river channel silt, converter slag and coal gangue; 77-80% of limestone raw material, 13-16% of river channel silt raw material, 5-7% of converter slag raw material and 0-5% of coal gangue raw material;
in the limestone, the chemical composition CaO: 48-50%, SiO 2: 2-3%, Al2O 3: 0.5-2%, Fe2O 3: 0.3-1%, MgO: 3-5%;
in the river channel silt, the chemical composition CaO: 7-9%, SiO 2: 65-67%, Al2O 3: 10-12%, Fe2O 3: 3-4%, MgO: 1-3%;
in the converter slag, the chemical composition CaO: 41-43%, SiO 2: 11-13%, Al2O 3: 4-6%, Fe2O 3: 22-24%, MgO: 10-12%;
in the coal gangue, the chemical composition CaO: 7-11%, SiO 2: 49-55%, Al2O 3: 12-15%, Fe2O 3: 4-8%, MgO: 1-3%;
a method for producing portland cement clinker by using ingredients of limestone, river channel silt, converter slag and coal gangue comprises the following steps: the method comprises the following steps of preparing dry powder raw materials by crushing, pre-homogenizing, proportioning, drying and grinding, feeding the raw materials into a dry pre-decomposition kiln for preheating and decomposition, and finally cooling after high-temperature calcination to obtain clinker, wherein the method specifically comprises the following steps:
1) the production raw materials of limestone, river channel silt, converter slag and coal gangue are respectively crushed to be less than or equal to 50mm and stored in a piling shed
2) Uniformly mixing limestone, river channel silt, converter slag and coal gangue in a ratio by mass, feeding the mixture into a drying and grinding system for grinding, and controlling the water content of a ground finished product to be less than or equal to 1.5 wt% and the screen residue of an 80-micron sieve to be less than or equal to 16 wt% to obtain dry powder raw materials;
3) feeding the homogenized raw material into a dry predecomposition kiln for preheating and decomposition, then calcining at 1300-1450 ℃ for 7-9min in a cement rotary kiln to obtain a partially molten material with material liquid phase amount of 22-25%, and cooling the molten material on a grate cooler to 60-100 ℃ by using a high-pressure fan for blowing at a cooling speed of 40-50 ℃/min to obtain the silicate cement clinker.
In the step 3), the specification of the dry predecomposition kiln is phi 4.8m multiplied by 74m, the dry predecomposition kiln is operated through a 5-stage preheating and decomposing system, and the decomposing rate of the materials entering the rotary kiln is controlled to be 90-95%; the 5-stage preheating and decomposing system is characterized in that the outlet temperature of a decomposing furnace of the rotary cement kiln system is controlled to be 860-900 ℃; the temperature of a tail smoke chamber of the rotary cement kiln is 1000-1200 ℃; the temperature of secondary air in the rotary cement kiln is 1000-1100 ℃; the tertiary air temperature in the rotary cement kiln is 800-900 ℃; the pushing times of the grate chamber of the grate cooler are 6-10 times/min.
By adopting the technical scheme, the invention has the beneficial effects that:
1) the scheme of producing silicate cement clinker by using coal gangue ingredients is characterized in that the coal gangue is an oxygen-enriched mineral containing a plurality of trace elements such as sulfur, aluminum, iron and the like, the crystal phase potential barrier of the minerals is weak, oxygen can be rapidly released when the temperature is over 800 ℃ in the high-speed heating process, and the released oxygen just plays a role in depolymerizing a [ SiO4] -4 reaction active body in a cement raw material, so that the burning of the clinker is effectively promoted, meanwhile, a large amount of trace elements in the coal gangue also contribute to the early appearance of a clinker liquid phase, the melting point of the substances is effectively reduced, and the generation of the clinker is further promoted.
2) The scheme of producing silicate cement clinker by using coal gangue ingredient can adopt high KH and high SM ingredient to add coal gangue, thus increasing the content of silicate mineral in clinker and obviously increasing the strength of the produced silicate clinker.
3) The scheme for producing the silicate cement clinker by using the coal gangue ingredient has the advantages that the coal gangue contains lower heat productivity, the reduction of clinker firing coal consumption can be effectively promoted, and a small amount of trace elements contained in the coal gangue effectively reduce the high-temperature melting point and viscosity of materials, improve the combustibility of raw materials, accelerate the proceeding of solid phase reaction, further reduce the clinker firing coal consumption, greatly improve the yield of a cement mill and a rotary kiln, greatly save energy, reduce the production cost, and reduce the emission of waste gases such as CO2 and NOX.
4) The silicate clinker prepared by the method provided by the invention has the advantages that the physical properties are obviously improved, so that the output of a cement mill is improved to a certain extent; the workability, water retention property, compatibility of cement and additives and the like of the cement are improved.
5) The scheme of producing the portland cement clinker by utilizing the coal gangue ingredient not only consumes a large amount of solid waste coal gangue, but also consumes a large amount of industrial waste such as river channel silt, converter slag and the like, reduces the stacking of waste residues and is beneficial to beautifying the ecological environment.
Drawings
FIG. 1 is a process flow diagram of a preparation method of portland cement clinker produced by coal gangue according to the invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific embodiments as follows:
therefore, the following detailed description of the embodiments of the present invention, provided in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention, and all other embodiments, which can be obtained by those skilled in the art based on the embodiments of the present invention without inventive faculty, are within the scope of the invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements can be directly connected or indirectly connected through an intermediate medium, and the two elements can be communicated with each other, so that the specific meaning of the terms in the invention can be understood by those skilled in the art.
Example 1:
a preparation method for producing portland cement clinker by coal gangue comprises limestone, river channel silt, converter slag and coal gangue; the weight parts of the limestone raw material are 79%, the weight parts of the river channel silt raw material are 15%, the weight parts of the converter slag raw material are 6%, and the weight parts of the coal gangue raw material are 0%;
in the limestone, the chemical composition CaO: 49.05%, SiO 2: 2.35%, Al2O 3: 0.88%, Fe2O 3: 0.45%, MgO: 3.5 percent;
in the river channel silt, the chemical composition CaO: 7.38%, SiO 2: 65.73%, Al2O 3: 10.23%, Fe2O 3: 3.37%, MgO: 1.55 percent;
in the converter slag, the chemical composition CaO: 41.13%, SiO 2: 12.47%, Al2O 3: 4.32%, Fe2O 3: 23.5%, MgO: 10.96 percent;
in the coal gangue, the chemical composition CaO: 8.25%, SiO 2: 55%, Al2O 3: 13.99%, Fe2O 3: 5.58%, MgO: 1.51 percent;
a method for producing portland cement clinker by using ingredients of limestone, river channel silt, converter slag and coal gangue comprises the following steps: the method comprises the following steps of preparing dry powder raw materials by crushing, pre-homogenizing, proportioning, drying and grinding, feeding the raw materials into a dry pre-decomposition kiln for preheating and decomposition, and finally cooling after high-temperature calcination to obtain clinker, wherein the method specifically comprises the following steps:
1) the production raw materials of limestone, river channel silt, converter slag and coal gangue are respectively crushed to be less than or equal to 50mm and stored in a piling shed
2) Uniformly mixing limestone, river channel silt, converter slag and coal gangue in a ratio by mass, feeding the mixture into a drying and grinding system for grinding, and controlling the water content of a ground finished product to be less than or equal to 1.5 wt% and the screen residue of an 80-micron sieve to be less than or equal to 16 wt% to obtain dry powder raw materials;
3) feeding the homogenized raw material into a dry predecomposition kiln for preheating and decomposition, then carrying out high-temperature calcination in a cement rotary kiln at 1300 ℃ for 7min to obtain a partially molten material with material liquid phase content of 22%, and cooling the molten material on a grate cooler to 60 ℃ by using a high-pressure fan for blowing at a cooling speed of 40 ℃/min to obtain the portland cement clinker.
In the step 3), the specification of the dry predecomposition kiln is phi 4.8m multiplied by 74m, the dry predecomposition kiln is operated by a 5-stage preheating and decomposing system, and the decomposing rate of the materials entering the rotary kiln is controlled to be 90 percent; the 5-level preheating and decomposing system is characterized in that the outlet temperature of the decomposing furnace of the rotary cement kiln system is controlled to 860 ℃; the temperature of a tail smoke chamber of the rotary cement kiln is 1000 ℃; the secondary air temperature in the cement rotary kiln is 1000 ℃; the tertiary air temperature in the cement rotary kiln is 800 ℃; the pushing times of the grate chamber of the grate cooler are 6 times/min.
Example 2:
a preparation method for producing portland cement clinker by coal gangue comprises limestone, river channel silt, converter slag and coal gangue; 78.5% of limestone raw material, 14% of river channel silt raw material, 6% of converter slag raw material and 1.5% of coal gangue raw material;
in the limestone, the chemical composition CaO: 49.05%, SiO 2: 2.35%, Al2O 3: 0.88%, Fe2O 3: 0.45%, MgO: 3.5 percent;
in the river channel silt, the chemical composition CaO: 7.38%, SiO 2: 65.73%, Al2O 3: 10.23%, Fe2O 3: 3.37%, MgO: 1.55 percent;
in the converter slag, the chemical composition CaO: 41.13%, SiO 2: 12.47%, Al2O 3: 4.32%, Fe2O 3: 23.5%, MgO: 10.96 percent;
in the coal gangue, the chemical composition CaO: 7.55%, SiO 2: 54.27%, Al2O 3: 14.11%, Fe2O 3: 4.38%, MgO: 1.51 percent;
a method for producing portland cement clinker by using ingredients of limestone, river channel silt, converter slag and coal gangue comprises the following steps: the method comprises the following steps of preparing dry powder raw materials by crushing, pre-homogenizing, proportioning, drying and grinding, feeding the raw materials into a dry pre-decomposition kiln for preheating and decomposition, and finally cooling after high-temperature calcination to obtain clinker, wherein the method specifically comprises the following steps:
1) the production raw materials of limestone, river channel silt, converter slag and coal gangue are respectively crushed to be less than or equal to 50mm and stored in a piling shed
2) Uniformly mixing limestone, river channel silt, converter slag and coal gangue in a ratio by mass, feeding the mixture into a drying and grinding system for grinding, and controlling the water content of a ground finished product to be less than or equal to 1.5 wt% and the screen residue of an 80-micron sieve to be less than or equal to 16 wt% to obtain dry powder raw materials;
3) feeding the homogenized raw material into a dry predecomposition kiln for preheating and decomposition, then carrying out high-temperature calcination in a cement rotary kiln at the calcination temperature of 1400 ℃ for 8min to obtain a partially molten material with the material liquid phase amount of 23%, and cooling the molten material on a grate cooler to 80 ℃ by using a high-pressure fan for blowing at the cooling speed of 45 ℃/min to obtain the portland cement clinker.
In the step 3), the specification of the dry predecomposition kiln is phi 4.8m multiplied by 74m, the dry predecomposition kiln is operated by a 5-stage preheating and decomposing system, and the decomposing rate of the materials entering the rotary kiln is controlled to be 92 percent; the 5-level preheating and decomposing system is characterized in that the outlet temperature of a decomposing furnace of the rotary cement kiln system is controlled to be 880 ℃; the temperature of a tail smoke chamber of the rotary cement kiln is 1100 ℃; the secondary air temperature in the rotary cement kiln is 1050 ℃; the temperature of tertiary air in the rotary cement kiln is 850 ℃; the pushing times of the grate chamber of the grate cooler are 8 times/minute.
Example 3:
a preparation method for producing portland cement clinker by coal gangue comprises limestone, river channel silt, converter slag and coal gangue; 78% of limestone raw material, 13% of river channel silt raw material, 6% of converter slag raw material and 3% of coal gangue raw material;
in the limestone, the chemical composition CaO: 49.05%, SiO 2: 2.35%, Al2O 3: 0.88%, Fe2O 3: 0.45%, MgO: 3.5 percent;
in the river channel silt, the chemical composition CaO: 7.38%, SiO 2: 65.73%, Al2O 3: 10.23%, Fe2O 3: 3.37%, MgO: 1.55 percent;
in the converter slag, the chemical composition CaO: 41.13%, SiO 2: 12.47%, Al2O 3: 4.32%, Fe2O 3: 23.5%, MgO: 10.96 percent;
in the coal gangue, the chemical composition CaO: 10.91%, SiO 2: 51%, Al2O 3: 12.33%, Fe2O 3: 4.58%, MgO: 2.41 percent;
a method for producing portland cement clinker by using ingredients of limestone, river channel silt, converter slag and coal gangue comprises the following steps: the method comprises the following steps of preparing dry powder raw materials by crushing, pre-homogenizing, proportioning, drying and grinding, feeding the raw materials into a dry pre-decomposition kiln for preheating and decomposition, and finally cooling after high-temperature calcination to obtain clinker, wherein the method specifically comprises the following steps:
1) the production raw materials of limestone, river channel silt, converter slag and coal gangue are respectively crushed to be less than or equal to 50mm and stored in a piling shed
2) Uniformly mixing limestone, river channel silt, converter slag and coal gangue in a ratio by mass, feeding the mixture into a drying and grinding system for grinding, and controlling the water content of a ground finished product to be less than or equal to 1.5 wt% and the screen residue of an 80-micron sieve to be less than or equal to 16 wt% to obtain dry powder raw materials;
3) feeding the homogenized raw material into a dry predecomposition kiln for preheating and decomposition, then carrying out high-temperature calcination in a cement rotary kiln at 1450 ℃ for 7-9min to obtain a partially molten material with material liquid phase content of 25%, and cooling the molten material on a grate cooler to 100 ℃ by using a high-pressure fan for blowing at a cooling speed of 50 ℃/min to obtain the portland cement clinker.
In the step 3), the specification of the dry predecomposition kiln is phi 4.8m multiplied by 74m, the dry predecomposition kiln is operated by a 5-stage preheating and decomposing system, and the decomposition rate of the materials entering the rotary kiln is controlled to be 95 percent; the 5-level preheating and decomposing system is characterized in that the outlet temperature of the decomposing furnace of the rotary cement kiln system is controlled to be 900 ℃; the temperature of a tail smoke chamber of the rotary cement kiln is 1200 ℃; the secondary air temperature in the rotary cement kiln is 1100 ℃; the temperature of tertiary air in the rotary cement kiln is 900 ℃; the pushing times of the grate chamber of the grate cooler are 10 times/min.
1. Analyzing chemical components of coal gangue: the coal gangue has large time span and long accumulation time, so the chemical composition change is very large, and the chemical composition of the coal gangue is shown in table 1 after multiple sampling;
as shown in Table 1, the coal gangue has great change of chemical components, and the coal gangue has different particle sizes due to long-time accumulation, which causes certain difficulty in use.
2. As shown in Table 2, the crushed coal gangue still has fluctuated chemical compositions, but can basically meet the use requirements.
3. The raw material adopts three components of materials, namely limestone, river channel silt and converter slag, and the chemical components of the raw material are shown in Table 3.
4. Because the MgO content in the raw materials is higher, through years of production practice, a blending scheme of high-iron and low-aluminum is groped, Al2O3 in clinker is strictly controlled within 4.8 percent, otherwise, the continuous operation of production is greatly influenced; however, as can be seen from the data in tables 2 and 3, the content of Al2O3 in the raw material is relatively high, and the formulation of the blending scheme is performed on the premise of ensuring the clinker Al2O3, and the blending ratio of the coal gangue is initially set to 1.5% (see table 4).
5. As can be seen from Table 5, after the blending ratio of the coal gangue reaches 1.5%, the content of Al2O3 in the clinker increases by 0.1% on average, which is close to 4.8%, the silicon rate of the clinker decreases to some extent, the aluminum rate increases to some extent, but the strength of the clinker does not change greatly.
6. In order to control the content of clinker Al2O3 and continuously improve the proportioning of coal gangue, the quality of coal entering the kiln is adjusted on the basis of the original raw materials, which is shown in Table 6.
7. The content of clinker Al2O3 is effectively controlled by adjusting the coal quality, and a foundation is laid for further use of coal gangue; after a period of use, the coal gangue proportion of our company is improved to 3 percent, and the chemical analysis and physical properties of the specific clinker are shown in Table 7; as can be seen from Table 7, after the blending ratio of the coal gangue is increased to 3%, the quality of the whole clinker is not greatly changed, and the strength of the clinker is slightly increased compared with the prior art.
1) The scheme of producing silicate cement clinker by using coal gangue ingredients is characterized in that the coal gangue is an oxygen-enriched mineral containing a plurality of trace elements such as sulfur, aluminum, iron and the like, the crystal phase potential barrier of the minerals is weak, oxygen can be rapidly released when the temperature is over 800 ℃ in the high-speed heating process, and the released oxygen just plays a role in depolymerizing a [ SiO4] -4 reaction active body in a cement raw material, so that the burning of the clinker is effectively promoted, meanwhile, a large amount of trace elements in the coal gangue also contribute to the early appearance of a clinker liquid phase, the melting point of the substances is effectively reduced, and the generation of the clinker is further promoted.
2) The scheme of producing silicate cement clinker by using coal gangue ingredient can adopt high KH and high SM ingredient to add coal gangue, thus increasing the content of silicate mineral in clinker and obviously increasing the strength of the produced silicate clinker.
3) The scheme for producing the silicate cement clinker by using the coal gangue ingredient has the advantages that the coal gangue contains lower heat productivity, the reduction of clinker firing coal consumption can be effectively promoted, and a small amount of trace elements contained in the coal gangue effectively reduce the high-temperature melting point and viscosity of materials, improve the combustibility of raw materials, accelerate the proceeding of solid phase reaction, further reduce the clinker firing coal consumption, greatly improve the yield of a cement mill and a rotary kiln, greatly save energy, reduce the production cost, and reduce the emission of waste gases such as CO2 and NOX.
4) The silicate clinker prepared by the method provided by the invention has the advantages that the physical properties are obviously improved, so that the output of a cement mill is improved to a certain extent; the workability, water retention property, compatibility of cement and additives and the like of the cement are improved.
5) The scheme of producing the portland cement clinker by utilizing the coal gangue ingredient not only consumes a large amount of solid waste coal gangue, but also consumes a large amount of industrial waste such as river channel silt, converter slag and the like, reduces the stacking of waste residues and is beneficial to beautifying the ecological environment.
The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Table 1 is a coal gangue chemical composition analysis table in the invention;
table 2 is a chemical composition analysis table of the coal gangue after the coal gangue crushing treatment in the invention;
table 3 is a chemical composition analysis table of other raw materials in the present invention;
table 4 shows the raw material ratio before and after using the coal gangue and the chemical composition and physical property analysis of the corresponding clinker;
table 5 shows the clinker analysis when the coal gangue proportion is 1.5% in the invention;
table 6 shows the industrial analysis variation of the coal quality of the incoming coal in the present invention;
table 7 shows the clinker analysis of the coal gangue at a coal gangue ratio of 3.0% in the present invention.
Claims (2)
1. A preparation method for producing portland cement clinker by coal gangue is characterized by comprising the following steps: comprises limestone, river channel silt, converter slag and coal gangue; 77-80% of limestone raw material, 13-16% of river channel silt raw material, 5-7% of converter slag raw material and 0-5% of coal gangue raw material;
in the limestone, the chemical composition CaO: 48-50%, SiO 2: 2-3%, Al2O 3: 0.5-2%, Fe2O 3: 0.3-1%, MgO: 3-5%;
in the river channel silt, the chemical composition CaO: 7-9%, SiO 2: 65-67%, Al2O 3: 10-12%, Fe2O 3: 3-4%, MgO: 1-3%;
in the converter slag, the chemical composition CaO: 41-43%, SiO 2: 11-13%, Al2O 3: 4-6%, Fe2O 3: 22-24%, MgO: 10-12%;
in the coal gangue, the chemical composition CaO: 7-11%, SiO 2: 49-55%, Al2O 3: 12-15%, Fe2O 3: 4-8%, MgO: 1-3%;
a method for producing portland cement clinker by using ingredients of limestone, river channel silt, converter slag and coal gangue comprises the following steps: the method comprises the following steps of preparing dry powder raw materials by crushing, pre-homogenizing, proportioning, drying and grinding, feeding the raw materials into a dry pre-decomposition kiln for preheating and decomposition, and finally cooling after high-temperature calcination to obtain clinker, wherein the method specifically comprises the following steps:
1) the production raw materials of limestone, river channel silt, converter slag and coal gangue are respectively crushed to be less than or equal to 50mm and stored in a piling shed
2) Uniformly mixing limestone, river channel silt, converter slag and coal gangue in a ratio by mass, feeding the mixture into a drying and grinding system for grinding, and controlling the water content of a ground finished product to be less than or equal to 1.5 wt% and the screen residue of an 80-micron sieve to be less than or equal to 16 wt% to obtain dry powder raw materials;
3) feeding the homogenized raw material into a dry predecomposition kiln for preheating and decomposition, then calcining at 1300-1450 ℃ for 7-9min in a cement rotary kiln to obtain a partially molten material with material liquid phase amount of 22-25%, and cooling the molten material on a grate cooler to 60-100 ℃ by using a high-pressure fan for blowing at a cooling speed of 40-50 ℃/min to obtain the silicate cement clinker.
2. The preparation method for producing the portland cement clinker by using the coal gangue as claimed in claim 1, wherein the specification of the dry predecomposition kiln is phi 4.8m × 74m, the dry predecomposition kiln is operated by a 5-stage preheating and decomposing system, and the decomposing rate of materials entering the rotary kiln is controlled to be 90-95%; the 5-stage preheating and decomposing system is characterized in that the outlet temperature of a decomposing furnace of the rotary cement kiln system is controlled to be 860-900 ℃; the temperature of a tail smoke chamber of the rotary cement kiln is 1000-1200 ℃; the temperature of secondary air in the rotary cement kiln is 1000-1100 ℃; the tertiary air temperature in the rotary cement kiln is 800-900 ℃; the pushing times of the grate chamber of the grate cooler are 6-10 times/min.
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| CN111718136A (en) * | 2020-07-01 | 2020-09-29 | 长沙紫宸科技开发有限公司 | Method for producing silicate clinker by using coal gangue to replace tail coal and silicon-aluminum raw material |
| CN113264698A (en) * | 2021-07-05 | 2021-08-17 | 中材萍乡水泥有限公司 | Portland cement clinker comprehensively utilizing low-grade limestone and production process thereof |
| CN113307515A (en) * | 2021-07-16 | 2021-08-27 | 中材萍乡水泥有限公司 | Portland cement clinker produced by using municipal sludge and process thereof |
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| CN111718136A (en) * | 2020-07-01 | 2020-09-29 | 长沙紫宸科技开发有限公司 | Method for producing silicate clinker by using coal gangue to replace tail coal and silicon-aluminum raw material |
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| CN113264698B (en) * | 2021-07-05 | 2022-07-26 | 中材萍乡水泥有限公司 | Portland cement clinker comprehensively utilizing low-grade limestone and production process thereof |
| CN113307515A (en) * | 2021-07-16 | 2021-08-27 | 中材萍乡水泥有限公司 | Portland cement clinker produced by using municipal sludge and process thereof |
| CN113814258A (en) * | 2021-09-15 | 2021-12-21 | 山东山铝环境新材料有限公司 | Solid waste treatment device based on cement kiln coprocessing |
| CN113814258B (en) * | 2021-09-15 | 2022-07-08 | 山东山铝环境新材料有限公司 | Solid waste treatment device based on cement kiln coprocessing |
| CN115321850A (en) * | 2022-09-05 | 2022-11-11 | 富源县宏发恒际水泥有限公司 | Raw material, clinker and cement formula and preparation method |
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