CN114933427A - Preparation method of all-industrial solid waste based low-carbon cement - Google Patents
Preparation method of all-industrial solid waste based low-carbon cement Download PDFInfo
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- CN114933427A CN114933427A CN202210490789.8A CN202210490789A CN114933427A CN 114933427 A CN114933427 A CN 114933427A CN 202210490789 A CN202210490789 A CN 202210490789A CN 114933427 A CN114933427 A CN 114933427A
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- 239000004568 cement Substances 0.000 title claims abstract description 80
- 239000002910 solid waste Substances 0.000 title claims abstract description 36
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 34
- 239000002893 slag Substances 0.000 claims abstract description 22
- 239000010440 gypsum Substances 0.000 claims abstract description 18
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 11
- 238000013461 design Methods 0.000 claims abstract description 11
- 239000010439 graphite Substances 0.000 claims abstract description 11
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 11
- 239000003110 molding sand Substances 0.000 claims abstract description 11
- 239000010959 steel Substances 0.000 claims abstract description 11
- 238000001354 calcination Methods 0.000 claims abstract description 10
- 238000000498 ball milling Methods 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 239000004571 lime Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 238000010791 quenching Methods 0.000 claims description 5
- 230000000171 quenching effect Effects 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 239000006227 byproduct Substances 0.000 claims description 2
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 2
- 235000012054 meals Nutrition 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000011161 development Methods 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 6
- 239000011398 Portland cement Substances 0.000 abstract description 2
- 238000013459 approach Methods 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 2
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000006467 substitution reaction 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
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical 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
- C04B7/24—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
- C04B7/36—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
- C04B7/48—Clinker treatment
- C04B7/52—Grinding ; After-treatment of ground cement
-
- 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
- Y02P40/18—Carbon capture and storage [CCS]
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a preparation method of all-industrial solid waste based low-carbon cement. The all-industrial solid waste based low-carbon cement is prepared by taking steel slag, carbide slag, graphite tailings, iron tailings and molding sand as raw materials, performing ball milling and calcination according to design values to obtain portland cement clinker, and then adding a certain amount of gypsum. The cement raw material obtained by the invention mainly comprises industrial solid wastes, and the physical and chemical properties prepared by comprehensively utilizing various industrial solid wastes meet the standard requirements of GB 175-. The invention provides a technical approach for carbon emission reduction and sustainable development in cement industry production.
Description
Technical Field
The invention relates to the technical field of cement production, in particular to a preparation method of all-industrial solid waste based low-carbon cement.
Background
The cement has excellent mechanical property and durability as a building material with maximum consumption and wide application, and is obtained in the fields of civil engineering, highways, railways, water conservancy, oceans, aerospace and the likeIs widely applied. Along with the rapid development of the building industry, the demand of cement increases year by year, the Chinese cement yield reaches 23.3 hundred million t in 2019, and 57 percent of the global cement yield continuously occupies the top of the world for more than 20 years. The cement is produced by using limestone and clay as main material and through two grinding and one burning, and the production process needs high temperature decomposition of limestone (CaCO) 3 ) To produce reactive silicate and aluminate phases, the decomposition process produces a large amount of CO 2 So that the cement is considered to be CO 2 The third major source of emissions. In the cement production process, the production of 1 t of Portland cement can generate about 0.8t of CO 2 60 million tons of natural resources and about 3% of total energy consumption are consumed each year, and 5-7% of carbon dioxide greenhouse gas is emitted each year globally. This is a significant challenge to sustainable development of the construction industry.
China is the largest cement producing country in the world and is also the largest cement consuming country. China is also a large industrial country, and the solid waste generated by industrial production every year is large in quantity and rich in resources. Therefore, the method reasonably utilizes industrial solid wastes to produce cement products with high performance, and has important significance for realizing sustainable development of building material industry, assisting the nation to realize the aim of 'double carbon' and protecting living environment.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for preparing all-industrial solid waste based low-carbon cement, so as to solve the problems of high energy consumption and high carbon dioxide emission in the existing cement production process.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a preparation method of full-industrial solid waste based low-carbon cement comprises the following steps:
1) pre-drying the raw materials until the water content is less than 1%;
2) according to design rate values, crushing the carbide slag, the steel slag, the graphite tailings and the molding sand in the raw materials, mixing in proportion and carrying out ball milling to obtain a cement raw material;
3) adding a proper amount of water into the cement raw material obtained in the step 2), pressing into a round cake shape, drying, calcining, and quenching to obtain cement clinker;
4) adding gypsum into the cement clinker obtained in the step 3), and grinding the gypsum into powder to obtain the all-industrial solid waste based low-carbon cement.
Optionally, the design value in step 2) is: the saturated lime coefficient KH is 0.90-0.94, the silicon rate is 2.2-2.4, and the aluminum rate is 1.2-1.4.
Optionally, the fineness of the cement raw meal in step 2) is 2.0-2.5% of 80 μm screen residue.
Optionally, the calcination temperature in the step 3) is 1400-1450 ℃, and the calcination time is 30-45 min.
Optionally, the f-CaO content of the cement clinker in the step 3) is 0.5-1.0%.
Optionally, in the step 4), the gypsum is one of natural gypsum, industrial byproduct gypsum and phosphogypsum, and the mixing amount of the gypsum is 2-5% of the using amount of the cement clinker.
Optionally, the specific surface area of the all-industrial solid waste based low-carbon cement in the step 4) is 350-400m 2 /kg。
Compared with the prior art, the preparation method of the all-industrial solid waste based low-carbon cement has the following advantages:
1. the method successfully prepares the all-industrial solid waste based low-carbon cement by adopting the carbide slag, the steel slag, the graphite tailings and the molding sand, and the obtained all-industrial solid waste based low-carbon cement meets the requirement of GB 175-.
2. The cement fired by the all-solid-waste material has excellent physical and chemical properties, can effectively reduce energy consumption and carbon dioxide emission in the cement production process, and provides a solution for sustainable development of the cement industry.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail with reference to examples.
The chemical composition of each raw material in each example of the present invention is shown in table 1.
TABLE 1 chemical composition of raw materials
| Raw material | SiO 2 | Al 2 O 3 | Fe 2 O 3 | CaO | MgO | LOI |
| Carbide slag | 2.64 | 1.34 | - | 65.03 | 0.03 | 29.94 |
| Steel slag | 4.52 | 2.90 | 28.53 | 33.26 | 5.68 | 6.25 |
| Graphite tailings | 24.78 | 13.94 | 3.50 | 1.83 | 0.53 | 51.55 |
| Molding sand | 92.12 | 4.96 | 0.28 | 0.7 | - | 0.88 |
Example 1
A preparation method of full-industrial solid waste based low-carbon cement comprises the following steps:
1) drying the raw materials in an oven at 105 +/-5 ℃ in advance until the water content is less than 1%;
2) according to design rate values, crushing carbide slag, steel slag, graphite tailings and molding sand in the raw materials, mixing and ball-milling according to proportion to obtain cement raw materials with 80 mu m of screen residue of 2.0%, wherein the saturated lime coefficient is 0.90, the silicon rate is 2.2, the aluminum rate is 1.2, and the mixture ratio of the raw materials is shown in table 2;
3) adding a proper amount of water into the cement raw materials obtained in the step 2), putting the cement raw materials into a tabletting mold, pressing the mixture into a round cake shape under the action of a press machine, drying the round cake shape in a drying oven at 105 +/-5 ℃ for 24 hours, calcining the dried round cake shape in a high-temperature muffle furnace at 1400 ℃ for 45 minutes, and quenching the calcined round cake shape to obtain blocky cement clinker;
4) adding gypsum into the blocky cement clinker obtained in the step 3), and grinding the blocky cement clinker into powder to obtain the full-industrial solid waste based low-carbon cement.
TABLE 2 raw material proportions and mineral composition design
| Examples | Carbide slag/%) | Steel slag/%) | Graphite tailing/% | Content of molding sand% | C 3 S | C 2 S | C 3 A | C 4 AF |
| Example 1 | 61.50％ | 7.88％ | 23.51％ | 7.11％ | 58.20％ | 18.82％ | 6.71％ | 13.74％ |
Example 2
A preparation method of all-industrial solid waste based low-carbon cement comprises the following steps:
1) drying the raw materials in an oven at 105 +/-5 ℃ in advance until the water content is less than 1%;
2) according to design rate values, crushing carbide slag, steel slag, graphite tailings and molding sand in the raw materials, mixing and ball-milling according to proportion to obtain cement raw materials with 80 mu m of screen residue of 2.3%, wherein the saturated lime coefficient is 0.92, the silicon-aluminum content is 2.3, the aluminum content is 1.3, and the mixing ratio of the raw materials is shown in table 3;
3) adding a proper amount of water into the cement raw materials obtained in the step 2), putting the cement raw materials into a tabletting mold, pressing the mixture into a round cake shape under the action of a press machine, drying the round cake shape in a drying oven at 105 +/-5 ℃ for 24 hours, calcining the dried round cake shape in a high-temperature muffle furnace at 1450 ℃ for 30 minutes, and quenching the calcined round cake shape to obtain blocky cement clinker;
4) adding gypsum into the blocky cement clinker obtained in the step 3), and grinding the blocky cement clinker into powder to obtain the full-industrial solid waste based low-carbon cement.
TABLE 3 raw material proportions and mineral composition design
| Examples | Carbide slag/%) | Steel slag/%) | Graphite tailing/% | Content of molding sand% | C 3 S | C 2 S | C 3 A | C 4 AF |
| Example 2 | 63.54％ | 6.44％ | 22.31％ | 7.52％ | 62.82％ | 14.97％ | 7.19％ | 12.50％ |
Example 3
A preparation method of full-industrial solid waste based low-carbon cement comprises the following steps:
1) drying the raw materials in an oven at 105 +/-5 ℃ in advance until the water content is less than 1%;
2) according to design rate values, crushing carbide slag, steel slag, graphite tailings and molding sand in the raw materials, mixing and ball-milling according to proportion to obtain cement raw materials with 80 mu m of screen residue of 2.5%, wherein the saturated lime coefficient is 0.94, the silicon-aluminum content is 2.4, the aluminum content is 1.4, and the mixing ratio of the raw materials is shown in table 4;
3) adding a proper amount of water into the cement raw materials obtained in the step 2), putting the cement raw materials into a tabletting mold, pressing the mixture into a round cake shape under the action of a press machine, drying the round cake shape in a drying oven at 105 +/-5 ℃ for 24 hours, calcining the dried round cake shape in a high-temperature muffle furnace at 1450 ℃ for 35 minutes, and quenching the calcined round cake shape to obtain blocky cement clinker;
4) adding gypsum into the blocky cement clinker obtained in the step 3) and grinding the gypsum into powder to obtain the full-industrial solid waste base low-carbon cement.
TABLE 4 raw material proportions and mineral composition design
| Examples | Carbide slag/%) | Steel slag/%) | Graphite tailing/%) | Content of molding sand% | C 3 S | C 2 S | C 3 A | C 4 AF |
| Example 3 | 63.74％ | 6.32％ | 22.75％ | 7.20％ | 67.36％ | 11.15％ | 7.56％ | 11.41％ |
The cement clinker fired by the technical means is ground until the specific surface area is within the range of 350-400kg/m3, and natural gypsum with the clinker doping amount of 2-5 percent is counted, so that the physical and chemical properties of the obtained all-industrial solid waste based low-carbon cement meet GB 175-2020, and are specifically shown in Table 5.
As can be seen from Table 5, the cement fired by the all-solid-waste material has excellent physical and chemical properties, and provides a technical approach for the resource utilization of solid wastes, the carbon emission reduction in the cement industrial production and the sustainable development.
TABLE 5 physicochemical Properties of all Industrial solid waste based Low carbon Cement obtained in examples
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The preparation method of the all-industrial solid waste based low-carbon cement is characterized by comprising the following steps of:
1) pre-drying the raw materials until the water content is less than 1%;
2) according to design rate values, crushing carbide slag, steel slag, graphite tailings and molding sand in raw materials, mixing in proportion and ball-milling to obtain cement raw materials;
3) adding a proper amount of water into the cement raw material obtained in the step 2), pressing into a round cake shape, drying, calcining, and quenching to obtain cement clinker;
4) adding gypsum into the cement clinker obtained in the step 3), and grinding the gypsum into powder to obtain the all-industrial solid waste based low-carbon cement.
2. The method for preparing the full-industrial solid waste based low-carbon cement according to claim 1, wherein the design value in the step 2) is as follows: the saturated lime coefficient KH is 0.90-0.94, the silicon rate is 2.2-2.4, and the aluminum rate is 1.2-1.4.
3. The method for preparing the whole industrial solid waste based low carbon cement as claimed in claim 1, wherein the fineness of the cement raw meal in step 2) is 80 μm and the screen residue is 2.0-2.5%.
4. The method for preparing the all-industrial solid waste based low-carbon cement as claimed in claim 1, wherein the calcination temperature in the step 3) is 1400-1450 ℃, and the calcination time is 30-45 min.
5. The method for preparing the full-industrial solid waste based low carbon cement according to claim 1, wherein the f-CaO content of the cement clinker in the step 3) is 0.5-1.0%.
6. The method for preparing the full-industrial solid waste based low-carbon cement according to claim 1, wherein the gypsum in the step 4) is one of natural gypsum, industrial byproduct gypsum and phosphogypsum, and the mixing amount of the gypsum is 2-5% of the dosage of the cement clinker.
7. The method for preparing the all-industrial solid waste based low-carbon cement as claimed in claim 1, wherein the specific surface area of the all-industrial solid waste based low-carbon cement in the step 4) is 350-400m 2 /kg。
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| CN202210490789.8A CN114933427A (en) | 2022-05-07 | 2022-05-07 | Preparation method of all-industrial solid waste based low-carbon cement |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110053148A (en) * | 2009-11-13 | 2011-05-19 | 한국지질자원연구원 | Method for manufacturing portland cement using tailing of mineral dressing and portland cement manufactured with this |
| CN109081615A (en) * | 2018-07-11 | 2018-12-25 | 盐城工学院 | A kind of road silicate cement clinker and preparation method thereof based on industrial residue |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110053148A (en) * | 2009-11-13 | 2011-05-19 | 한국지질자원연구원 | Method for manufacturing portland cement using tailing of mineral dressing and portland cement manufactured with this |
| CN109081615A (en) * | 2018-07-11 | 2018-12-25 | 盐城工学院 | A kind of road silicate cement clinker and preparation method thereof based on industrial residue |
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Application publication date: 20220823 |