CN112408898A - Process for producing baking-free type filter-pressing soil tailing bricks through cogeneration and co-maintenance of cement plant - Google Patents
Process for producing baking-free type filter-pressing soil tailing bricks through cogeneration and co-maintenance of cement plant Download PDFInfo
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- CN112408898A CN112408898A CN202011348492.5A CN202011348492A CN112408898A CN 112408898 A CN112408898 A CN 112408898A CN 202011348492 A CN202011348492 A CN 202011348492A CN 112408898 A CN112408898 A CN 112408898A
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/024—Steam hardening, e.g. in an autoclave
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Abstract
The invention relates to a process for producing a baking-free type filter-pressed soil tailing brick through cogeneration and co-curing in a cement plant, which comprises the following steps: s1, obtaining filter pressing soil and screen blanking; s3, uniformly stirring the small filter pressing soil obtained in the step S2, the screening material and the cement according to a ratio, wherein the filter pressing soil accounts for 55% -65%, the screening material accounts for 25% -30% and the cement accounts for 10% -15%; s4, scattering the stirred and mixed material in the step S3 in a primary powder mixer; s5, aging the mixture obtained in the step S4; s6, scattering the mixture obtained in the step S5 in a secondary powder mixer; s7, sorting the mixture obtained in the step S6 in a roller screen machine, and returning the oversize part with the grain size of more than 20mm to a secondary powder mixer for scattering; s8, inputting the sorted materials with the grain size of less than 20mm in the step S7 into a brick machine for press forming; and S9, performing autoclaved curing on the green bricks by using an autoclave. The invention relates to a baking-free brick preparation process, which can treat aggregate waste residues and reduce energy consumption in a brick making process by utilizing a factory waste heat power generation technology.
Description
Technical Field
The invention relates to a production process of a baking-free filter-pressing soil tailing brick, in particular to a production process of a baking-free filter-pressing soil tailing brick through cogeneration and co-curing in a cement plant.
Background
The clay sintered brick is a traditional building material and plays a great role in the development process of human beings, but the disadvantages of the clay sintered brick are gradually shown in the 21 st century of high-speed development: the farmland is seriously damaged, the energy consumption is high, the emission is high, the statistical data shows that the farmland damaged by firing clay bricks per year can reach more than 15 million hectares, and the coal consumption for producing the clay bricks per year is about 7000 million tons. With the implementation of related policy of farmland protection and environmental protection, clay bricks are forbidden in a plurality of large and medium-sized cities since 2002, and baking-free bricks as a novel building material gradually replace the clay brick market. It is worth noting that although the energy consumption and the discharge amount of the baking-free brick are much lower than those of the clay baked brick, the production process of the baking-free brick has an indispensable link: and (5) steam pressure curing. Generally, the autoclave curing temperature is as high as 150-200 ℃ for 6-10 hours, and a large amount of energy is still consumed in the autoclave curing process.
The temperature of high-temperature steam generated in the waste heat power generation process of a cement plant is as high as 330-380 ℃, and if the high-temperature steam is used for autoclaved curing of baking-free bricks after being treated by cooling and pressure reducing equipment, a large amount of energy can be saved, auxiliary equipment related to the autoclaved process can be reduced, and considerable economic benefit can be brought.
Disclosure of Invention
The invention aims to solve the technical problem of providing a production process of a baking-free type press-filtration soil tailing brick through cooperation of waste heat power generation and maintenance of a cement plant, which is a baking-free brick preparation process, can treat a large amount of aggregate waste residues, and reduces energy consumption in a brick making process by using a factory waste heat power generation technology.
The technical scheme adopted by the invention for solving the technical problems is as follows: the process for producing the baking-free type filter-pressed soil tailing brick through the cogeneration and co-curing of the cement plant comprises the following steps:
s1, obtaining filter pressing soil and screen blanking, wherein the filter pressing soil is waste discharged after slurry generated after washing aggregates is dewatered by a filter press, and the screen blanking is leftover materials in the aggregate crushing and sorting process;
s2, crushing the large filter pressing soil into small pieces of materials;
s3, uniformly stirring the small filter pressing soil obtained in the step S2, the screening material and the cement according to the proportion, wherein the mass percentage of each component in the mixture is as follows: 55-65% of filter-pressing soil, 25-30% of screening material and 10-15% of cement;
s4, scattering the stirred and mixed material in the step S3 in a primary powder mixer;
s5, aging the mixture obtained in the step S4;
s6, scattering the mixture obtained in the step S5 in a secondary powder mixer;
s7, sorting the mixture obtained in the step S6 in a roller screen machine, and returning the oversize part with the grain size of more than 20mm to a secondary powder mixer for scattering;
s8, inputting the sorted materials with the grain size of less than 20mm in the step S7 into a brick machine for press forming;
and S9, performing autoclaved curing on the green bricks by using an autoclave.
In the method, the water content of the mixture in the step S3 is not more than 10%.
In the above method, the steam pressure of the autoclave in the step S9: 1.2MPa, temperature: 190 ℃ and 200 ℃, and the autoclaving time is 8-10 hours.
In the method, the high-temperature steam in the autoclave in the step S9 comes from the cement plant waste heat power station, and the high-temperature steam in the cement plant waste heat power station is subjected to temperature and pressure reduction by the cooling and pressure reduction equipment to adjust the temperature and pressure parameters of the high-temperature steam until the baking-free brick curing requirement is met.
The cement plant waste heat power generation and co-curing baking-free type press-filtration soil tailing brick production process has the following beneficial effects:
1. the comprehensive cost of the standard bricks (240 x 115 x 53) cured by conventional steam is about 0.25 yuan per brick, the cost of the baking-free bricks cured by using the waste heat of the cement kiln is lower than that of the baking-free bricks cured by a natural gas boiler, and the cost of a single brick can be reduced by 0.07 yuan, so that the brick has higher economic value.
2. The production workshop in the process is a totally-enclosed workshop, dust discharge is reduced, the waste heat of the cement kiln is used as steam of the still kettle, no emission is caused, and the process is a green and environment-friendly factory.
3. The curing steam used by the invention is generated by waste heat of the cement kiln, and the raw materials adopted by brick making are all from the own cement plant and aggregate plant, thus being beneficial to extending an industrial chain of a cement enterprise and forming a circular economy enterprise.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow chart of the process for producing the baking-free type filter-pressed soil tailing brick through the cooperation of waste heat power generation and maintenance of a cement plant;
FIG. 2 is a flow chart of preparing steam satisfying the autoclaved curing requirement by using the waste heat power generation technology.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in figure 1, the waste heat power generation and co-curing baking-free type filter-pressing soil tailing brick production process of the cement plant uniformly mixes the filter-pressing soil waste residue with large water content with raw materials such as screening material, cement and the like, a brick blank is formed by high-pressure pressing of a brick machine, and the quality and the performance of the brick are improved by an autoclaved curing process. Which comprises the following steps:
1 raw material storage and mix preparation
1.1 waste residue composition detection
Firstly, chemical components of filter-pressing soil to be treated are detected, and the chemical components can influence the reaction process in the autoclaved curing process and further directly influence the strength of the baking-free brick. The results of wu-chu filter press soil testing are shown in table 1:
TABLE 1
| Name of material | SiO2 | CaO | MgO | Fe2O3 | Al2O3 | LOI |
| Wu cave filter-pressing soil | 10.13 | 34.57 | 10.49 | 1.11 | 3.02 | 39.10 |
According to the detection result, the main chemical components of the Wu-cave filter pressing soil are calcite and dolomite, wherein the dolomite can carry out chemical reaction under the high-temperature alkaline environment.
1.2 Filter-pressing soil waste residue preparation
As the Wu-cave aggregate is a wet process, the aggregate is cleaned by circulating water in the process of processing and crushing, stone powder originally attached to the surface of the aggregate and part of clay attached to the surface of the aggregate are also washed off, and the slurry is treated by a filter press to form filter-pressed soil-mud cakes. Under the influence of technology and treatment efficiency, the water content of the filter-pressing soil is generally maintained to be more than 20 percent, and when the filter-pressing soil is used for making bricks, overhigh water content must be matched with sieve materials with lower water content for use.
2 stirring the ingredients
Because the filter pressing soil contains enough moisture, no water needs to be added in the production process. Materials such as filter-pressing soil, screening materials, cement and the like enter the horizontal mixer after being weighed, the mixing amount and the mixing time of each disc of the mixer are controlled by the central control room, and a good mixing effect can be ensured by adopting an intermittent mixing method.
Because the filter-pressing soil has high plasticity and is easy to agglomerate in the stirring process to influence the uniformity of the materials, the materials are required to be subjected to powder mixing after passing through the stirrer, and the soil agglomerates are further scattered. And (3) feeding the scattered materials into an aging bin through a belt conveyor, wherein the aging time is 20-30 minutes, so that the moisture in the materials is more uniform. The aged material can basically ensure that all the soil mass is scattered after passing through a secondary powder mixer, and the stability of the quality of the baking-free brick product is ensured. The materials are mixed by secondary powder and then enter a drum sieve, and large-particle stones and few unopened soil lumps in the sieved materials are mainly removed.
3 green brick forming
And (3) making the materials sieved by the drum screen into green bricks by using a brick making machine, wherein 36 bricks are formed in each mold, and the forming period is about 14-15 seconds. And stacking the green bricks on steam curing trolleys by using a manipulator, wherein 1680 blocks are stacked on each trolley, and 30 cars of green bricks can be cured by each autoclave.
4 maintenance and storage
The working parameters of the still kettle are as follows:
working pressure (Max): 1.5MPa (normal 1.2 MPa); operating temperature (Max): 201.4 ℃; designing pressure: 1.6 MPa; design temperature: 204.3 ℃; full volume: 168m3。
The parameters of the main water vapor of the waste heat power station are as follows:
pressure: the rated pressure is 2.2MPa, and the actual operation is 1.27-1.7 MPa; temperature: the rated temperature is 370 ℃, and the actual operation is 330-380 ℃.
According to the parameters, the tail gas temperature of the waste heat power station is higher than the designed pressure of the still kettle, so that one set of water spraying temperature reducing device is designed. As shown in fig. 2, the dotted line in fig. 2 is used to select a part as the original cogeneration system. And (3) after the water vapor led out from the waste heat power station air collecting cylinder passes through the water spraying temperature reducing device, reducing the temperature to the temperature required by the production process of the still kettle, and sending the steam to the still kettle for use. The water source used by the water spraying temperature reduction device is from a high-pressure water supply system of the waste heat power station, and the requirement of the water spraying system can be met. And (3) supplying part of high-temperature steam generated in the waste heat power generation production process to a baking-free brick production line for steam pressure curing, and still performing waste heat power generation on the rest part. The supply of high-temperature steam is coordinated according to the cement plant and the production condition of the baking-free bricks, and the maximum utilization of resources can be ensured.
And (3) autoclaved curing the green brick by using an autoclave, and keeping the pressure: 1.2MPa, temperature: 170 ℃ and 180 ℃, and autoclaving for 8-10 hours. And (4) after the finished bricks are discharged from the kettle, the finished bricks are qualified after being cooled, and then the finished bricks can be packaged and delivered out of the factory.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. The process for producing the baking-free type filter-pressed soil tailing brick through cogeneration and co-curing in a cement plant is characterized by comprising the following steps of:
s1, obtaining filter pressing soil and screen blanking, wherein the filter pressing soil is waste discharged after slurry generated after washing aggregates is dewatered by a filter press, and the screen blanking is leftover materials in the aggregate crushing and sorting process;
s2, crushing the large filter pressing soil into small pieces of materials;
s3, uniformly stirring the small filter pressing soil obtained in the step S2, the screening material and the cement according to the proportion, wherein the mass percentage of each component in the mixture is as follows: 55-65% of filter-pressing soil, 25-30% of screening material and 10-15% of cement;
s4, scattering the stirred and mixed material in the step S3 in a primary powder mixer;
s5, aging the mixture obtained in the step S4;
s6, scattering the mixture obtained in the step S5 in a secondary powder mixer;
s7, sorting the mixture obtained in the step S6 in a roller screen machine, and returning the oversize part with the grain size of more than 20mm to a secondary powder mixer for scattering;
s8, inputting the sorted materials with the grain size of less than 20mm in the step S7 into a brick machine for press forming;
and S9, performing autoclaved curing on the green bricks by using an autoclave.
2. The cement plant waste heat power generation and co-curing baking-free type filter-pressed soil tailing brick production process as claimed in claim 1, wherein the water content of the mixture in the step S3 is not more than 10%.
3. The cement plant waste heat power generation and co-curing baking-free type pressure filtration soil tailing brick production process as claimed in claim 1, wherein in the step S9, the steam pressure of an autoclave is as follows: 1.2MPa, temperature: 190 ℃ and 200 ℃, and the autoclaving time is 8-10 hours.
4. The process for producing the baking-free type pressure-filtered soil tailing brick through cogeneration and co-curing in the cement plant according to claim 1, wherein the high-temperature steam in the autoclave in the step S9 is from a cement plant waste heat power station, and the high-temperature steam in the cement plant waste heat power station is subjected to temperature and pressure reduction by cooling and pressure reduction equipment to adjust the temperature and pressure parameters of the high-temperature steam until the baking-free brick curing requirement is met.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113701511A (en) * | 2021-08-03 | 2021-11-26 | 华新水泥股份有限公司 | Method for preparing building material by utilizing waste heat power generation of cement plant |
| CN115180914A (en) * | 2022-06-22 | 2022-10-14 | 上海市机电设计研究院有限公司 | Preparation method of biomass ash baking-free brick cured by boiler tail gas |
| CN115611559A (en) * | 2022-09-23 | 2023-01-17 | 华新水泥股份有限公司 | Cement-free environment-friendly baking-free brick and preparation method thereof |
| CN115974475A (en) * | 2022-12-16 | 2023-04-18 | 华新水泥股份有限公司 | Cement brick and hydration carbonization cooperative maintenance process |
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Application publication date: 20210226 |