Cement clinker doped with barium slag as well as preparation method and application of cement clinker

Abstract

The invention provides a cement clinker doped with barium slag and a preparation method and application thereof, and relates to the technical field of cement clinker preparation, the cement clinker is prepared from a main material and an admixture raw material component, the main material is composed of limestone, sandstone, clay, an iron material and barium slag, the admixture is composed of 3% of coal ash, and the admixture is composed of 1% of calcium carbonate. The main material comprises the following raw material components in percentage by weight: 79-83% of limestone, 0-3% of sandstone, 11-14% of clay, 1.9-2.4% of ferrous material and 1-7% of barium slag; according to the invention, barium slag is introduced as a modification component based on a traditional cement clinker formula system, so that multiple technical benefits can be realized at the same time: seed crystal doping, cement 28d strength improvement, orthorhombic system tricalcium aluminate content reduction, cement use performance improvement and the like, and the optimal barium slag doping amount is determined to be 5%; the prepared cement clinker and cement have the characteristics of high later strength, good use performance and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cement clinker preparation, in particular to a cement clinker mixed with barium slag, a preparation method and application thereof. BACKGROUND

[0002] With the overall development of China's infrastructure construction, the consumption of building materials is rising, and the use of cement, as an important material, is also increasing. The raw materials used in the production of cement, although relatively low in economic value, are all natural non-renewable resources. With the increase in the use of resources, the storage of resources is gradually decreasing. The use of industrial waste slag to produce cement not only reduces the dependence of cement enterprises on traditional resources and environmental pollution, but also significantly reduces production costs, and plays a strong role in promoting the sustainable development of the building materials industry, bringing significant economic and social benefits to enterprises and society. In recent years, the industry has strengthened the control of non-renewable resources and encouraged the use of industrial waste slag. Many cement production enterprises have actively responded and made beneficial attempts and explorations in resource comprehensive utilization, and have achieved certain results.

[0003] However, in the current disclosed technology for producing cement using industrial waste slag, there are still some deficiencies, mainly that the quality of cement fluctuates greatly and the strength is low, which is difficult to meet the needs of large-scale construction projects. Therefore, how to scientifically adjust the proportion of various raw materials and fully play the role of each raw material to effectively utilize waste materials without reducing the performance of cement has become a problem to be solved. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide a cement clinker mixed with barium slag, a preparation method and application thereof, which can solve the technical problems proposed in the background art.

[0005] The embodiments of the present application provide a cement clinker mixed with barium slag, which is prepared from a main body material and an external admixture raw material component. The main body material is composed of limestone, sandstone, clay, iron material and barium slag, and the external admixture is composed of 3% coal ash. The weight percentage of each raw material component of the main body material is as follows: limestone 79-83%, sandstone 0-3%, clay 11-14%, iron material 1.9-2.4%, and barium slag 1-7%.

[0006] The limestone includes the following components in the following weight percentages: LOSS 40-42%, SiO2 3.5-4%, Al2O3 1-1.1%, Fe2O3 0.4-0.6%, CaO 45-55%, and MgO 1.7-1.9%; The sandstone includes the following components in percentage by weight: LOSS 4-5%, SiO2 70-85%, Al2O3 7.5-8%, Fe2O3 7.5-8%, CaO 0.2-0.3%, MgO 0.4-0.5%; The clay includes the following components in percentage by weight: LOSS 7-8%, SiO2 55-65%, Al2O3 15-17%, Fe2O3 5-6%, CaO 4-5%, MgO 2-2.5%; The ferruginous material includes the following components in percentage by weight: LOSS 20-25%, SiO2 15-17%, Al2O3 6-7%, Fe2O3 35-40%, CaO 11-12%, MgO 2.8-3%; The barium slag includes the following components in percentage by weight: LOSS 7-8%, SiO2 30-40%, Al2O3 3.5-4%, Fe2O3 2-2.2%, CaO 2-2.5%, MgO 0.6-0.8%; The coal ash includes the following components in percentage by weight: LOSS 0%, SiO2 55-60%, Al2O3 15-25%, Fe2O3 12-15%, CaO 2-4%, MgO 1-1.5%.

[0007] The application further provides a preparation method of the cement clinker mixed with the barium slag, including the following steps: S1, each raw material of the cement clinker is conveyed to a blending warehouse after being crushed and homogenized; S2, each raw material in the blending warehouse is conveyed to a raw material roller mill after being weighed and mixed, and the raw material is conveyed to a raw material homogenization warehouse after being ground; S3, the raw material in the raw material homogenization warehouse is conveyed to a cyclone preheater C1 through a kiln elevator, and then the material is conveyed into a rotary kiln through a cyclone preheater and a decomposing furnace; S4, the material in the rotary kiln is conveyed through a heat release reaction zone, a sintering zone and a cooling zone, and then the sintered clinker is cooled by heat exchange with cold air in a grate cooler; S5, the cement clinker in the grate cooler is cooled after heat exchange, and then the cooled cement clinker is crushed by a roller crusher and conveyed to a cement clinker warehouse.

[0008] In step S4, the calcination temperature is 1400-1500℃.

[0009] The application further provides an application of the cement clinker mixed with the barium slag in cement production, which is mixed with gypsum, ground to obtain cement, and applied.

[0010] The application has the following beneficial effects: The application introduces barium slag as a modified component based on a traditional cement clinker formula system, and can simultaneously achieve multiple technical benefits: adding crystal seeds, improving the 28d strength of cement, reducing the content of tricalcium aluminate of an orthorhombic system, improving the use performance of cement, etc., the optimal barium slag addition amount is 5%, and the prepared cement clinker and cement have the characteristics of high later strength and good use performance; in addition, under the premise of scientific testing and optimization of the addition ratio, the cement kiln has great advantages in the co-processing of hazardous waste barium slag, the clinker quality, kiln condition and kiln output can be kept stable and qualified, and the calcium and barium elements in the barium slag can be effectively utilized, the production material consumption is reduced, and the product performance is improved, the technical path perfectly fits the green manufacturing concept, and a double-effect co-processing mechanism of hazardous waste disposal and high-performance building material production is constructed. DETAILED DESCRIPTION

[0011] In order to facilitate the understanding of the present application, the present application will be described more fully below by examples, and the preferred embodiments of the present application are given below. However, the present application can be realized in various different forms, and is not limited to the embodiments described herein. Any modification or equivalent replacement of the technical solutions of the present application without creative results obtained by other embodiments are within the protection scope of the present application.

[0012] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is only for describing specific embodiments of the application and is not intended to limit the application.

[0013] The numerical values disclosed in the embodiments of the present application are approximate values, not definite values. Within the error or experimental conditions, all values within the error range can be included without being limited to the specific numerical values disclosed in the embodiments of the present application.

[0014] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present application can be purchased from the market or can be prepared by existing methods.

[0015] The present application provides a cement clinker doped with barium slag, which is prepared from main materials and external admixture raw material components, the main materials are composed of limestone, sandstone, clay, iron material and barium slag, the external admixture is composed of 3% coal ash, and the weight percentage of each raw material component of the main materials is as follows: limestone 79-83%, sandstone 0-3%, clay 11-14%, iron material 1.9-2.4%, and barium slag 1-7%.

[0016] In the present application, the limestone includes the following weight percentage of components: LOSS 40.99%, SiO2 3.72%, Al2O3 1.04%, Fe2O3 0.47%, CaO 50.52%, MgO 1.80%, and the rest is impurities. The sandstone includes the following components in weight percentage: LOSS 4.60%, SiO2 77.96%, Al2O3 7.70%, Fe2O3 7.85%, CaO 0.24%, MgO 0.47%, and the rest is impurities; The clay includes the following components in weight percentage: LOSS 7.51%, SiO2 59.45%, Al2O3 15.59%, Fe2O3 5.40%, CaO 4.63%, MgO 2.16%, and the rest is impurities; The ferruginous material includes the following components in weight percentage: LOSS 21.86%, SiO2 15.75%, Al2O3 6.39%, Fe2O3 7.08%, CaO 11.61%, MgO 2.89%, and the rest is impurities; The barium slag includes the following components in weight percentage: LOSS 7.50%, SiO2 35.56%, Al2O3 3.85%, Fe2O3 2.08%, CaO 2.39%, MgO 0.71%, and the rest is impurities; The coal ash includes the following components in weight percentage: LOSS 0%, SiO2 57.77%, Al2O3 19.40%, Fe2O3 13.93%, CaO 3.29%, MgO 1.26%, and the rest is impurities.

[0017] The application further provides a preparation method of the cement clinker mixed with the barium slag, including the following steps: S1, each raw material of the cement clinker is conveyed to a blending warehouse after being crushed and homogenized; S2, each raw material in the blending warehouse is conveyed to a raw material roller mill after being weighed and mixed, and the raw material is conveyed to a raw material homogenization warehouse after being ground; S3, the raw material in the raw material homogenization warehouse is conveyed to a cyclone preheater C1 through a kiln elevator, and then the material is conveyed into a rotary kiln through a cyclone preheater and a decomposing furnace; S4, the material in the rotary kiln is conveyed through a heat release reaction zone, a sintering zone and a cooling zone, and then the sintered clinker is cooled by heat exchange with cold air in a grate cooler; S5, the cement clinker in the grate cooler is cooled after heat exchange, and then the cooled cement clinker is crushed by a roller crusher and conveyed to a cement clinker warehouse.

[0018] In the application, the calcination temperature in step S4 is 1400-1500℃.

[0019] The application further provides an application of the cement clinker mixed with the barium slag in cement production, wherein the cement clinker is mixed with gypsum, ground, and then the cement is obtained and applied.

[0020] The following are specific examples and comparative examples:

[0021] Embodiment 1

[0022] The embodiment provides a cement clinker incorporated with barium slag, the cement clinker being prepared from main material and external admixture raw material components, the main material being composed of limestone, sandstone, clay, iron material and barium slag, the external admixture being composed of 3% coal ash, and the weight percentage of each raw material component of the main material being as follows: limestone 82.34%, sandstone 1.59%, clay 13.10%, iron material 1.97% and barium slag 1.00%.

[0023] The embodiment further provides a preparation method of the cement clinker incorporated with barium slag, and the method comprises the following steps: S1, each raw material of the cement clinker is conveyed to a blending warehouse after being crushed and homogenized; S2, each raw material in the blending warehouse is conveyed to a raw material roller mill after being weighed and mixed; S3, the raw material in the raw material homogenization warehouse is conveyed to a cyclone preheater C1 through a kiln elevator, and then the material is conveyed into a rotary kiln through a cyclone preheater and a decomposing furnace; S4, the material in the rotary kiln passes through a heat release reaction zone, a sintering zone and a cooling zone, and then the sintered clinker is cooled by heat exchange with cold air in a grate cooler; S5, the cement clinker in the grate cooler is cooled after heat exchange, and then the cooled cement clinker is crushed by a roller crusher and conveyed to a cement clinker warehouse.

[0024] In the embodiment, the calcination temperature in step S4 is 1450 DEG C.

[0025] The embodiment further provides application of the cement clinker incorporated with barium slag in cement production, wherein the cement clinker is mixed with gypsum, ground, and then cement is obtained for application.

[0026] Embodiment 2

[0027] The embodiment provides a cement clinker incorporated with barium slag, the cement clinker being prepared from main material and external admixture raw material components, the main material being composed of limestone, sandstone, clay, iron material and barium slag, the external admixture being composed of 3% coal ash, and the weight percentage of each raw material component of the main material being as follows: limestone 81.88%, sandstone 1.16%, clay 12.97%, iron material 1.99% and barium slag 2.00%.

[0028] The embodiment further provides a preparation method of the cement clinker incorporated with barium slag, and the method comprises the following steps: S1, each raw material of the cement clinker is conveyed to a blending warehouse after being crushed and homogenized; S2, each raw material in the blending library is weighed and mixed and delivered to the raw material roller mill for raw material grinding, and the ground raw material is delivered to the raw material homogenization library; S3, the raw material in the raw material homogenization library is delivered to the cyclone preheater C1 by the kiln elevator, and then the material is preheated by the cyclone preheater and the decomposing furnace, and then enters the rotary kiln; S4, the material in the rotary kiln passes through the heat release reaction zone, the sintering zone and the cooling zone, and then the sintered clinker enters the grate cooler and exchanges heat with the cold air for cooling; S5, the cement clinker in the grate cooler is cooled after heat exchange, and then the cooled cement clinker is crushed by the roller crusher and delivered to the cement clinker library.

[0029] In this embodiment, in step S4, the calcination temperature is 1450℃.

[0030] This embodiment also provides a cement clinker incorporating barium slag for use in cement production. The cement clinker is mixed with gypsum, ground, and obtained as cement for use.

[0031] Example 3

[0032] This embodiment provides a cement clinker incorporating barium slag, which is prepared from main materials and external admixture raw material components. The main materials are composed of limestone, sandstone, clay, iron material and barium slag, and the external admixture is composed of 3% coal ash. The weight percentage of each raw material component of the main materials is: limestone 81.414%, sandstone 0.733%, clay 12.831%, iron material 2.022%, and barium slag 3.000%.

[0033] This embodiment also provides a preparation method of a cement clinker incorporating barium slag, which comprises the following steps: S1, each raw material of the cement clinker is crushed and homogenized and then delivered to the blending library; S2, each raw material in the blending library is weighed and mixed and delivered to the raw material roller mill for raw material grinding, and the ground raw material is delivered to the raw material homogenization library; S3, the raw material in the raw material homogenization library is delivered to the cyclone preheater C1 by the kiln elevator, and then the material is preheated by the cyclone preheater and the decomposing furnace, and then enters the rotary kiln; S4, the material in the rotary kiln passes through the heat release reaction zone, the sintering zone and the cooling zone, and then the sintered clinker enters the grate cooler and exchanges heat with the cold air for cooling; S5, the cement clinker in the grate cooler is cooled after heat exchange, and then the cooled cement clinker is crushed by the roller crusher and delivered to the cement clinker library.

[0034] In this embodiment, in step S4, the calcination temperature is 1450℃.

[0035] The embodiment further provides application of the cement clinker incorporated with the barium residue in cement production, the cement clinker is mixed with gypsum, ground, and cement is obtained, and the cement is applied.

[0036] Embodiment 4

[0037] The embodiment provides a cement clinker incorporated with a barium residue, the cement clinker is prepared from main materials and external admixture raw material components, the main materials are composed of limestone, sandstone, clay, iron material and the barium residue, the external admixture is composed of 3% coal ash, and the weight percentage of each raw material component of the main materials is as follows: limestone 80.951%, sandstone 0.305%, clay 12.694%, iron material 2.050% and the barium residue 4.000%.

[0038] The embodiment further provides a preparation method of the cement clinker incorporated with the barium residue, and the method comprises the following steps: S1, each raw material of the cement clinker is conveyed to a blending warehouse after being crushed and homogenized; S2, each raw material in the blending warehouse is conveyed to a raw material roller mill after being weighed and mixed, and the raw material is conveyed to a raw material homogenization warehouse after being ground; S3, the raw material in the raw material homogenization warehouse is conveyed to a cyclone preheater C1 through a kiln elevator, and then the material is conveyed into a rotary kiln through a cyclone preheater and a decomposing furnace; S4, the material in the rotary kiln is conveyed through a heat release reaction zone, a sintering zone and a cooling zone, and then the sintered clinker is cooled by heat exchange with cold air in a grate cooler; S5, the cement clinker in the grate cooler is cooled after heat exchange, and then the cooled cement clinker is crushed by a roller crusher and conveyed to a cement clinker warehouse.

[0039] In the embodiment, the calcination temperature in step S4 is 1450 DEG C.

[0040] The embodiment further provides application of the cement clinker incorporated with the barium residue in cement production, the cement clinker is mixed with gypsum, ground, and cement is obtained, and the cement is applied.

[0041] Embodiment 5

[0042] The embodiment provides a cement clinker incorporated with a barium residue, the cement clinker is prepared from main materials and external admixture raw material components, the main materials are composed of limestone, sandstone, clay, iron material and the barium residue, the external admixture is composed of 3% coal ash, and the weight percentage of each raw material component of the main materials is as follows: limestone 80.488%, sandstone 0.304%, clay 11.991%, iron material 2.217% and the barium residue 5.000%.

[0043] The embodiment further provides a preparation method of the cement clinker incorporated with the barium residue, and the method comprises the following steps: S1, each raw material of the cement clinker is crushed, homogenized and then transported to a blending warehouse; S2, each raw material in the blending warehouse is weighed and mixed and then transported to a raw material roller mill for raw material grinding, and the ground raw material is transported to a raw material homogenizing warehouse; S3, the raw material in the raw material homogenizing warehouse is transported to a cyclone preheater C1 by a kiln elevator, and then the material is preheated by the cyclone preheater and decomposed in a decomposing furnace before entering a rotary kiln; S4, the material in the rotary kiln passes through a heat releasing reaction zone, a sintering zone and a cooling zone, and then the sintered clinker enters a grate cooler to exchange heat with cold air for cooling; S5, the cement clinker in the grate cooler is cooled after heat exchange, and the cooled cement clinker is crushed by a roller crusher and then transported to a cement clinker warehouse.

[0044] In this embodiment, the calcination temperature in step S4 is 1450°C.

[0045] This embodiment also provides an application of the cement clinker incorporated with barium slag in cement production. The cement clinker is mixed with gypsum, ground, and then a cement is obtained for application.

[0046] Embodiment 6

[0047] This embodiment provides a cement clinker incorporated with barium slag, which is prepared from a main body material and an external admixture raw material component. The main body material is composed of limestone, sandstone, clay, iron material and barium slag, and the external admixture is composed of 3% coal ash. The weight percentage of each raw material component of the main body material is as follows: limestone 80.024%, sandstone 0.184%, clay 11.447%, iron material 2.345%, and barium slag 6.000%.

[0048] This embodiment also provides a preparation method of the cement clinker incorporated with barium slag, which comprises the following steps: S1, each raw material of the cement clinker is crushed, homogenized and then transported to a blending warehouse; S2, each raw material in the blending warehouse is weighed and mixed and then transported to a raw material roller mill for raw material grinding, and the ground raw material is transported to a raw material homogenizing warehouse; S3, the raw material in the raw material homogenizing warehouse is transported to a cyclone preheater C1 by a kiln elevator, and then the material is preheated by the cyclone preheater and decomposed in a decomposing furnace before entering a rotary kiln; S4, the material in the rotary kiln passes through a heat releasing reaction zone, a sintering zone and a cooling zone, and then the sintered clinker enters a grate cooler to exchange heat with cold air for cooling; S5, the cement clinker in the grate cooler is cooled after heat exchange, and the cooled cement clinker is crushed by a roller crusher and then transported to a cement clinker warehouse.

[0049] In this embodiment, the calcination temperature in step S4 is 1450°C.

[0050] The embodiment further provides application of the cement clinker incorporated with the barium residue in cement production, the cement clinker is mixed with gypsum, ground, and cement is obtained, and the cement is applied.

[0051] Embodiment 7

[0052] The embodiment provides a cement clinker incorporated with a barium residue, the cement clinker is prepared from main materials and external admixture raw material components, the main materials are composed of limestone, sandstone, clay, iron material and the barium residue, the external admixture is composed of 3% coal ash, and the weight percentage of each raw material component of the main materials is as follows: limestone 79.642%, sandstone 0.000%, clay 11.047%, iron material 2.311%, and the barium residue 7.000%.

[0053] The embodiment further provides a preparation method of the cement clinker incorporated with the barium residue, and the method comprises the following steps: S1, each raw material of the cement clinker is conveyed to a blending warehouse after being crushed and homogenized; S2, each raw material in the blending warehouse is conveyed to a raw material roller mill after being weighed and mixed, and the raw material is conveyed to a raw material homogenization warehouse after being ground; S3, the raw material in the raw material homogenization warehouse is conveyed to a cyclone preheater C1 through a kiln elevator, and then the material is conveyed into a rotary kiln through a cyclone preheater and a decomposing furnace; S4, the material in the rotary kiln is conveyed through a heat release reaction zone, a sintering zone and a cooling zone, and then the sintered clinker is cooled by heat exchange with cold air in a grate cooler; S5, the cement clinker in the grate cooler is cooled after heat exchange, and then the cooled cement clinker is crushed by a roller crusher and conveyed to a cement clinker warehouse.

[0054] In the embodiment, the calcination temperature in step S4 is 1450 DEG C.

[0055] The embodiment further provides application of the cement clinker incorporated with the barium residue in cement production, the cement clinker is mixed with gypsum, ground, and cement is obtained, and the cement is applied.

[0056] Comparative example

[0057] The comparative example provides a cement clinker incorporated with a barium residue, the cement clinker is prepared from main materials and external admixture raw material components, the main materials are composed of limestone, sandstone, clay, iron material and the barium residue, the external admixture is composed of 3% coal ash, and the weight percentage of each raw material component of the main materials is as follows: limestone 82.803%, sandstone 2.019%, clay 13.241%, iron material 1.937%, and the barium residue 0.000%.

[0058] The comparative example further provides a preparation method of the cement clinker incorporated with the barium residue, and the method comprises the following steps: S1, each raw material of cement clinker is transported to a blending store after being crushed and homogenized; S2, each raw material in the blending store is transported to a raw mill roller after being weighed and mixed, and the raw material after being ground is transported to a raw material homogenization store; S3, the raw material in the raw material homogenization store is transported to a cyclone preheater C1 by a kiln elevator, and then the material is transported into a rotary kiln after passing through a cyclone preheater and a decomposing furnace; S4, the material in the rotary kiln passes through a heat releasing reaction zone, a sintering zone and a cooling zone, and then the sintered clinker is cooled by heat exchange in a grate cooler and cooled by air exchange; S5, the cement clinker in the grate cooler is cooled after heat exchange, and then the cooled cement clinker is crushed by a roller crusher and transported to a cement clinker store.

[0059] In the present comparative example, the calcination temperature in step S4 is 1450°C.

[0060] The present comparative example also provides an application of the cement clinker mixed with barium slag in cement production. The cement clinker is mixed with gypsum, ground to obtain cement, and applied.

[0061] Table 1 below is a table of physical and chemical analysis and mineral composition analysis of the cement clinkers prepared in Examples 1-7 and the comparative example.

[0062] Comparative Example (0% barium slag) Example 1 (1% barium slag) Example 2 (2% barium slag) Example 3 (3% barium slag) Example 4 (4% barium slag) Example 5 (5% barium slag) Example 6 (6% barium slag) Example 7 (7% barium slag) LOSS 0.55 0.60 0.59 0.56 0.56 0.55 0.51 0.57 SiO2 21.17 21.04 20.96 20.91 20.87 20.8 20.72 20.65 Al2O3 5.35 5.32 5.30 5.25 5.26 5.24 5.22 5.18 Fe2O3 3.35 3.33 3.32 3.30 3.29 3.28 3.27 3.25 CaO 65.23 64.60 64.38 64.07 63.79 63.43 63.42 62.73 MgO 2.89 2.88 2.88 2.85 2.83 2.83 2.83 2.80 SO3 0.36 0.44 0.52 0.64 0.74 0.79 0.85 0.97 f-CaO 1.09 1.09 1.21 1.21 1.23 1.23 1.50 1.51 KH 0.932 0.928 0.928 0.927 0.923 0.921 0.925 0.917 n 2.43 2.43 2.43 2.45 2.44 2.44 2.44 2.45 P 1.60 1.60 1.60 1.59 1.60 1.60 1.60 1.59 3d strength 32.1 31.0 32.5 32.4 31.8 32.0 30.1 30.0 28d strength 55.9 56.6 56.9 57.0 58.7 58.9 58.4 58.0 Tricalcium silicate (M3) 36.35 35.91 34.84 34.40 35.20 37.32 31.60 31.91 Tricalcium silicate (M1) 19.90 19.13 19.66 19.82 18.63 15.87 18.98 18.95 Dicalcium silicate (β) 3.21 1.13 3.30 3.59 0.71 1.78 2.70 2.15 Tricalcium aluminate (cubic) 2.11 2.49 2.24 2.24 2.01 2.56 2.36 2.26 Tricalcium aluminate (orthorhombic) 6.52 6.13 5.60 4.65 4.71 3.64 3.03 3.03 Tetracalcium aluminio- ferrite 12.01 12.04 12.40 12.51 13.20 12.09 12.85 12.66 Calcium oxide 2.90 2.76 2.48 2.81 3.07 2.41 2.75 2.93 Periclase 1.54 1.71 1.54 1.60 1.77 1.52 1.54 1.66 Quartz 0.15 0.07 0.07 0.07 0.05 0.00 0.07 0.06 Dicalcium silicate (α) 9.10 11.55 10.62 11.64 12.60 13.96 14.36 14.72 Dicalcium silicate (γ) 0.12 0.13 0.26 0.23 0.23 0.01 0.30 0.24 Dicalcium silicate (αH') 1.45 1.96 1.20 1.37 0.97 0.80 1.39 1.55 Dicalcium silicate (αL') 3.93 4.36 4.86 3.93 5.44 6.43 6.93 6.37 As can be seen from Table 1 above, the three rate values of the cement clinkers prepared in Examples 1-7 and the comparative example are KH=0.92±0.015, SM=2.39±0.1 and IM=1.59±0.1, and the SO3 content gradually increases with the increase of the barium slag content, but remains within the range of SO3≤2.0%, in addition, several key indicators of the cement clinker such as Na2O≤1.0%, standard consistency≤24% and hexavalent chromium≤9ppm meet the index requirements, and as can be seen from Table 1 above, the barium slag has a clear increasing trend on dicalcium silicate, especially on high-activity dicalcium silicate, and a clear decreasing trend on tricalcium aluminate, mainly on the orthorhombic system; it is concluded that the best barium slag content point is 5%, at which the free calcium content does not increase significantly, the free calcium content≤1.5%, the high-activity dicalcium silicate content increases, the 3d strength is basically flat, the 3d strength≥30MPa, but when the barium slag content exceeds 5%, the 3d strength decreases significantly, the 28d strength is the highest, the 28d strength≥55MPa.

[0063] In the above examples and comparative examples, the barium slag and other raw materials are proportioned and metered into the raw material batching and pretreatment system of the cement kiln, and after sufficient mixing, stirring, homogenization, drying and other pretreatments, they are fed into the kiln through the raw mill feeding point for co-processing; during the test period, the cement kiln is continuously produced without interruption, and the production process and process parameters remain unchanged; the barium slag is ground, crushed, dried, decomposed, high-temperature calcined and solidified in the raw material mill from the raw material section to produce cement clinker, and the high-temperature decomposition and conversion in the kiln lasts nearly 1 hour, which fully meets the complete incineration disposal of the material, and no residue of the incinerated barium slag is found after analyzing the cement products.

[0064] In the above examples and comparative examples, the test method for the strength performance of cement is as follows: the cement clinker is ground in a Φ500mm×500mm small mill to produce P·I type cement, and the cement mortar is prepared according to the requirements of “Cement Mortar Strength Test Method” (GB / T 17671-1999) with one part of cement and three parts of ISO standard sand, using a water-cement ratio of 0.5, and curing in a humidity curing box at (20±1) ℃ for 24 hours after demolding and then in a curing pool for 28d±8h.

[0065] As can be seen, based on the traditional cement clinker formula system, the barium slag is introduced as a modified component, which can achieve multiple technical benefits: adding crystal seeds, improving the 28d strength of cement, reducing the content of tricalcium aluminate with an orthorhombic system, and improving the performance of cement, etc., and the optimal barium slag addition amount is 5%, and the cement clinker and cement produced have the characteristics of high later strength and good performance; in addition, under the premise of scientific testing and optimization of the addition ratio, the cement kiln has great advantages in co-processing of hazardous waste barium slag, the clinker quality, kiln condition and kiln output can be kept stable and qualified, and the calcium and barium elements in the barium slag can be effectively utilized to reduce production material consumption and improve product performance, which perfectly fits the green manufacturing concept and builds a double-effect co-processing mechanism of hazardous waste disposal and high-performance building material production.

[0066] In addition, the barium slag raw material incorporated in the present application is general solid waste and industrial recycled barium slag, and the harmful components such as heavy metals are detected by a third party, and the product quality meets the industry standards of GB 175-2023, HJ 662-2013, GB / T 30760-2024, etc., through strict control of raw materials and process optimization, the present application realizes safe resource utilization of barium slag, while ensuring the environmental performance and quality stability of the products.

[0067] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A cement clinker incorporating barium slag, characterized in that: Cement clinker is prepared from main materials and admixtures. The main materials consist of limestone, sandstone, clay, ferrous materials and barium slag. The admixtures consist of 3% coal ash. The weight percentages of each raw material component in the main materials are: limestone 79-83%, sandstone 0-3%, clay 11-14%, ferrous materials 1.9-2.4%, and barium slag 1-7%.

2. The cement clinker with added barium slag according to claim 1, characterized in that: Limestone comprises the following components by weight percentage: LOSS 40–42%, SiO2 3.5–4%, Al2O3 1–1.1%, Fe2O3 0.4–0.6%, CaO 45–55%, MgO 1.7–1.9%; Sandstone comprises the following components by weight percentage: LOSS 4–5%, SiO2 70–85%, Al2O3 7.5–8%, Fe2O3 7.5–8%, CaO 0.2–0.3%, MgO 0.4–0.5%; The clay comprises the following components by weight percentage: Loss 7–8%, SiO2 55–65%, Al2O3 15–17%, Fe2O3 5–6%, CaO 4–5%, MgO 2–2.5%; The ferrous material comprises the following components by weight percentage: LOSS 20-25%, SiO2 15-17%, Al2O3 6-7%, Fe2O3 35-40%, CaO 11-12%, MgO 2.8-3%; The barium slag comprises the following components by weight percentage: LOSS 7-8%, SiO2 30-40%, Al2O3 3.5-4%, Fe2O3 2-2.2%, CaO 2-2.5%, and MgO 0.6-0.8%. The coal ash content includes the following components by weight percentage: LOSS 0%, SiO2 55-60%, Al2O3 15-25%, Fe2O3 12-15%, CaO 2-4%, and MgO 1-1.5%.

3. A method for preparing cement clinker incorporating barium slag as described in claim 1 or 2, characterized in that: Includes the following steps: S1. The raw materials for cement clinker are crushed, homogenized, and then transported to the blending warehouse. S2. After weighing, the raw materials in the mixing silo are mixed and transported to the raw material roller mill for raw material grinding. After grinding, the raw material is transported to the raw material homogenization silo. S3. The raw materials in the raw material homogenization silo are transported to the cyclone preheater C1 by the kiln elevator. After that, the materials enter the rotary kiln after passing through the cyclone preheater and the decomposition furnace. S4. The material in the rotary kiln passes through the exothermic reaction zone, the firing zone, and the cooling zone, and then the calcined clinker enters the grate cooler to exchange heat with cold air for cooling. S5. The cement clinker in the grate cooler is cooled after heat exchange. After cooling, the cement clinker is crushed by a roller crusher and then transported to the cement clinker silo.

4. The method for preparing cement clinker with added barium slag according to claim 3, characterized in that: In step S4, the calcination temperature is 1400–1500℃.

5. The application of a barium slag-incorporated cement clinker as described in claim 1 or 2 in cement production, characterized in that: The cement clinker is mixed with gypsum, ground, and then cement is obtained for application.