CN115974475A - Cement brick and hydration carbonization cooperative maintenance process - Google Patents
Cement brick and hydration carbonization cooperative maintenance process Download PDFInfo
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- CN115974475A CN115974475A CN202211620966.6A CN202211620966A CN115974475A CN 115974475 A CN115974475 A CN 115974475A CN 202211620966 A CN202211620966 A CN 202211620966A CN 115974475 A CN115974475 A CN 115974475A
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- 239000004568 cement Substances 0.000 title claims abstract description 128
- 239000011449 brick Substances 0.000 title claims abstract description 112
- 238000003763 carbonization Methods 0.000 title claims abstract description 60
- 238000006703 hydration reaction Methods 0.000 title claims abstract description 30
- 230000036571 hydration Effects 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000008569 process Effects 0.000 title claims abstract description 22
- 238000012423 maintenance Methods 0.000 title description 28
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 72
- 238000003825 pressing Methods 0.000 claims abstract description 37
- 239000000463 material Substances 0.000 claims abstract description 32
- 239000002689 soil Substances 0.000 claims abstract description 28
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims abstract description 22
- 239000000347 magnesium hydroxide Substances 0.000 claims abstract description 22
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 22
- 238000000227 grinding Methods 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 238000012216 screening Methods 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 13
- 238000002360 preparation method Methods 0.000 claims abstract description 12
- 238000010000 carbonizing Methods 0.000 claims abstract description 3
- 230000000887 hydrating effect Effects 0.000 claims abstract 2
- 239000000203 mixture Substances 0.000 claims description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 239000002994 raw material Substances 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000011707 mineral Substances 0.000 claims description 7
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 4
- 229910021532 Calcite Inorganic materials 0.000 claims description 3
- 239000002734 clay mineral Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 2
- 239000010419 fine particle Substances 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims 1
- 229910052791 calcium Inorganic materials 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000002440 industrial waste Substances 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 18
- 239000010959 steel Substances 0.000 description 18
- 239000002893 slag Substances 0.000 description 17
- 239000000047 product Substances 0.000 description 13
- 239000007789 gas Substances 0.000 description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- 239000002918 waste heat Substances 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 239000004566 building material Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 230000003068 static effect Effects 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910052900 illite Inorganic materials 0.000 description 2
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 description 2
- 239000012744 reinforcing agent Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 241001062954 Clinopodium Species 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910001919 chlorite Inorganic materials 0.000 description 1
- 229910052619 chlorite group Inorganic materials 0.000 description 1
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 239000011456 concrete brick Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- YGANSGVIUGARFR-UHFFFAOYSA-N dipotassium dioxosilane oxo(oxoalumanyloxy)alumane oxygen(2-) Chemical compound [O--].[K+].[K+].O=[Si]=O.O=[Al]O[Al]=O YGANSGVIUGARFR-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000009731 jinlong Substances 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 230000001089 mineralizing effect Effects 0.000 description 1
- 229910052627 muscovite Inorganic materials 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005185 salting out Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 230000004584 weight gain Effects 0.000 description 1
- 235000019786 weight gain Nutrition 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a cement brick, which comprises the following components in parts by weight: 17-25 parts of low-carbon cement clinker, 0.7-1.4 parts of magnesium hydroxide, 26-54 parts of screening material and 35-66 parts of filter pressing soil; firstly, mixing and grinding low-carbon cement clinker and magnesium hydroxide to form modified low-carbon cement, scattering and mixing the obtained modified low-carbon cement with screened material and filter-pressing soil, uniformly stirring, pressing, drying and pre-curing, and hydrating/carbonizing for cooperative curing to obtain the low-carbon cement. The modified low-carbon cement is used as a main cementing material, large-dosage cement industrial wastes such as screening materials, filter pressing soil and the like are introduced, and the cement brick is prepared by adopting a simpler hydration/carbonization cooperative curing process, so that the good comprehensive use performance of the cement brick can be effectively considered, the preparation period is obviously shortened, and the cement brick has obvious economic and environmental benefits and is suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a cement brick and a hydration/carbonization cooperative maintenance process thereof
Background
In the field of materials, mineralizing and fixing CO 2 The production of building material products has become the focus of research. The steel slag is used as waste in the steel industry, contains a large amount of high-temperature treated silicon dioxide, has the advantages of hydration activity and the like under the alkali excitation condition, and is often used as a mixed material resource for cement manufacture. In addition, the steel slag also contains air-hardening silicate minerals, and the existing carbonized building material products mostly use the steel slag as a main basic raw material.
Aiming at the hydration and carbonization dual reaction characteristics of steel slag, ordinary cement, low-carbon cement and the like, some reports for preparing building material products by using steel slag, low-carbon cement, portland cement and the like as main raw materials for carbonization and hydration synergistic curing exist at present, and the advantage of high carbonization reaction rate is utilized to shorten the curing period to a certain extent, such as: the patent CN109437828A discloses a steel slag carbonization hydration synergistic curing process, which utilizes the chemical characteristics of steel slag that both carbonization activity and hydration activity are utilized, introduces a carbonization curing and pre-wetting ceramic sand internal curing synergistic mechanism (carbonization is firstly carried out and then standard curing is carried out), and improves the overall reaction degree of the steel slag; patent CN113956000A discloses a cement kiln tail gas carbonized building prefabricated product and a preparation method thereof, wherein raw materials such as carbonized cement, portland cement and concrete aggregate tailing powder are dry-mixed and wet-mixed, then are lightly pressed and molded, and then are carbonized and cured and naturally placed and cured to prepare the carbonized building prefabricated product (firstly carbonized and then standard cured); the patent CN114538849A discloses a preparation process of a steel slag-based water permeable brick cured by a hydration-carbonization coupling system and a steel slag-based carbonized water permeable brick, wherein the steel slag, cement, stone and other raw materials which are uniformly mixed are pre-cured, demoulded for low-temperature hydration curing, and then placed in a carbonization environment for curing for a period of time to prepare a steel slag-based water permeable brick product. However, as mentioned aboveThe technical scheme based on hydration and carbonization cooperative maintenance technology is generally used for CO in the carbonization maintenance stage 2 The concentration requirement is higher, and the total curing period of the carbonization-hydration is still longer (the reaction efficiency is still to be improved).
Therefore, the method has important research and application significance for further exploring a simple and efficient preparation process of building material products.
Disclosure of Invention
The invention mainly aims to provide a cement brick and a hydration carbonization cooperative maintenance process thereof aiming at the problems and the defects in the existing carbonization technology which mainly uses steel slag; the existing raw materials and equipment conditions of a cement plant are fully utilized, a simpler production process is adopted, the building material product with hydration, carbonization and cooperative maintenance is prepared, various cement industrial wastes can be efficiently treated, the limitation of the existing carbonization brick making technology mainly using steel slag is broken through, meanwhile, the production period of the cement brick can be effectively shortened, the good comprehensive service performance of the obtained brick product is considered, and the cement brick has important economic and environmental benefits and is suitable for popularization and application.
In order to achieve the purpose, the invention adopts the technical scheme that:
a cement brick comprises the following raw materials in parts by weight: 17 to 25 portions of low-carbon cement clinker, 0.7 to 1.4 portions of magnesium hydroxide, 26 to 54 portions of sieve material and 35 to 66 portions of filter pressing soil.
In the scheme, the particle size of the low-carbon cement clinker is 5-50 mm, and the mineral composition and the mass percentage thereof comprise: 0 to 50% of CS and C 3 S 2 7～25％，γ-C 2 S 0～10％，C 3 S 8～22％，β-C 2 S 11～33％，SiO 2 6～12％。
In the scheme, the screening material is a mixture mainly composed of stone powder and clay fine particle materials formed by crushing and screening ores in the aggregate preparation process; the grain diameter is 5-10 mm, and the water content is 3-8%.
In the scheme, the filter pressing soil is a mud block with the diameter within 10cm, which is obtained by pressing the waste after the aggregate is washed by water through a filter press; the main chemical composition of the clod comprises: 50-60% of calcite, 10-20% of quartz, 5-25% of clay mineral and 18-20% of water content.
In the scheme, the clay mineral comprises one or more of chlorite, illite, kaolinite, mica and the like.
In the scheme, in the raw materials of the cement brick, low-carbon cement clinker and magnesium hydroxide are firstly mixed and ground to prepare the modified low-carbon cement.
The preparation method of the cement brick specifically comprises the following steps:
1) Weighing raw materials: the raw materials and the weight portions thereof are as follows: 17-25 parts of low-carbon cement clinker, 0.7-1.4 parts of magnesium hydroxide, 26-54 parts of screen blanking material and 35-66 parts of filter pressing soil;
2) Preparing modified low-carbon cement: mixing the weighed low-carbon cement clinker with magnesium hydroxide, and grinding to obtain modified low-carbon cement;
3) Preparing a mixture: uniformly mixing the modified low-carbon cement with the sieved material and the filter-pressed soil according to the proportion to prepare a mixture;
4) Green brick forming: pressing and molding the obtained mixture to obtain a green brick;
5) Pre-curing the green bricks: drying and pre-curing the green bricks;
6) And (3) green brick carbonization and maintenance: and carbonizing and curing the obtained pre-cured green bricks to obtain the final cement brick products.
In the scheme, the grinding time in the step 2) is 30-60 min, and the Boehringer specific surface area of the obtained modified low-carbon cement is 290-400 m 2 /kg。
In the scheme, the mixing step in the step 3) adopts a forced stirrer for stirring, the stirring time is 40-60 s, and the stirring speed is 300-1350r/min; the grain diameter of the obtained mixture is less than 10mm, and the water content is 8-13%.
In the scheme, the green brick forming step in the step 4) adopts the forming pressure of 3-5 MPa and the time of 3-10 s.
In the scheme, the drying and pre-curing in the step 5) preferably uses the waste heat of the cement kiln tail as a heat source, and the curing temperature is controlled to be 90-130 ℃ and the time is 0.5-7 h; the water content of the obtained pre-cured green brick is 3-8%.
Further, the curing time adopted in the drying pre-curing step in the step 5) is preferably 0.5 to 2 hours.
In the above scheme, the hydration/carbonization curing step in step 6) adopts process parameters including: CO 2 2 The concentration is 20-60 vol%, the pressure is 0.10-0.50 MPa, the temperature is 50-70 ℃, the relative humidity is 60-100%, and the curing time is 6-10 h.
In the scheme, in the hydration/carbonization curing step, the purified cement kiln tail flue gas is preferably introduced as a carbon source (CO) 2 )。
Further, the temperature of the cement kiln tail flue gas before purification is 90-130 ℃, and the temperature of CO is 90-130 DEG C 2 The concentration is 14-16 vol%, and the concentration of water vapor is 7-14 vol%.
The principle of the invention is as follows:
the invention takes the ground modified low-carbon cement as a main cementing material, a small amount of reinforcing agent magnesium hydroxide is added in the traditional grinding process of low-carbon cement clinker to promote the effective compounding of the magnesium hydroxide and the low-carbon cement clinker, ensure the modification effect of the magnesium hydroxide, prepare the modified low-carbon cement, then mix the modified low-carbon cement with cement industrial wastes such as screening materials, filter pressing soil and the like which are introduced in large mixing amount and combine the processes of hydration/carbonization maintenance and the like to prepare the cement brick with good comprehensive use performance: in the preparation process of the mixture, the filter-pressed soil is firstly scattered by the external force of the stirrer, and the scouring action during the material screening and mixing is superposed to form small-sized soil; sieving, discharging, mud, modified low-carbon cement (low-carbon clinker + magnesium hydroxide + grinding process) and fully stirring and mixing uniformly; in the pressing and forming stage, the material is sieved to form a framework of the green brick to play a supporting effect, and filter pressing soil and modified low-carbon cement are filled between the frameworks together to ensure that the green brick is compact and stable; in the drying and pre-curing treatment process, part of moisture introduced by filter pressing soil and screen blanking materials in the green bricks is dried and discharged, a gas diffusion channel is reserved for the next-stage carbonization, and hydraulic components in cement are quickly hydrated to generate calcium silicate hydrate, so that certain early strength is provided, and calcium hydroxide is generated; in the brick blank hydration carbonization cooperative maintenance stage, the modified low-carbon cement air-hardening minerals and a small amount of calcium hydroxide generated in the pre-maintenance stage are quickly carbonated to generate strength so as to provide middle and later stage strength, and in addition, the introduced magnesium hydroxide increases the system alkalinity on one hand, is beneficial to the stable existence of a carbonization reaction product carbonate and promotes the forward progress of the carbonization reaction; on the other hand, the magnesium ions can increase nucleation sites in the carbonization precipitation crystallization process, inhibit the growth (relative) of carbonate crystals, refine crystal grains, and increase the specific surface area of the obtained carbonization reaction product, thereby further promoting the improvement of the carbonization reaction efficiency and the carbonization degree, and effectively considering the mechanical property, the softening coefficient, the freeze-thaw cycle performance and the like of the obtained cement brick product.
Compared with the prior art, the invention has the beneficial effects that:
1) The invention takes the screen blanking and the filter pressing soil as main raw materials, can dispose a large amount of two industrial waste residues of the screen blanking and the filter pressing soil in the aggregate production process, and fully utilizes the physical characteristics of the two raw materials to further improve the performance of cement brick products;
2) The dosage of the cementing material related to the invention is less, and in the existing carbonization technology of steel slag or steel slag matched with cement, the dosage of the cementing material such as steel slag and the like is usually more than 40 percent; introduced Mg (OH) 2 The content of the reinforcing agent is less (the influence on the cost is small), and simultaneously, mg (OH) is introduced into the conventional grinding process of the low-carbon clinker 2 The grinding pretreatment is carried out, so that the carbonization efficiency and the carbonization degree of the mixture obtained by the invention can be effectively improved on the premise of not additionally increasing the working procedures and energy consumption, and the comprehensive use performance of the obtained cement brick is obviously improved;
3) In the drying pre-curing and hydration carbonization cooperative curing process steps, the waste heat of the tail gas of the cement kiln can be further fully utilized, and the CO in the tail gas can be effectively cured 2 The carbon emission of a cement plant is reduced;
4) The carbonization curing process has simple conditions, can obviously shorten the production period, and is easy to realize industrial production;
5) The standard brick product cured by hydration, carbonization and cooperation has excellent performance and meets the standard requirement of the concrete brick of MU 15.
Detailed Description
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
In the following examples, three types of low carbon cement clinker (1 #, 2#, 3 #) were provided by the city, jinlong cement (yun county), wherein the 1# low carbon cement clinker comprises the following main minerals by mass percent: c 3 S 21％，β-C 2 S 33％，C 3 S 2 25％，SiO 2 11 percent; the 2# low-carbon cement clinker comprises the following main minerals by mass percent: c 3 S 13％、β-C 2 S 18％、γ-C 2 S 10％、CS 30％、C 3 S 2 8％、SiO 2 8 percent; the 3# low-carbon cement clinker comprises the following main minerals in percentage by mass: c 3 S 22％、β-C 2 S 31％、CS 26％、C 3 S 2 8％、SiO 2 6 percent; the grain diameters of the three types of low-carbon cement clinker particles are 5-50 mm, and the chemical compositions are shown in Table 1.
TABLE 1 Low carbon Cement Clinker chemical composition (wt%)
| Low-carbon cement clinker | CaO | SiO 2 | Al 2 O 3 | Fe 2 O 3 | MgO | SO 3 |
| 1# | 56.32 | 28.22 | 4.58 | 3.53 | 2.95 | 0.59 |
| 2# | 53.45 | 33.92 | 4.04 | 2.86 | 2.61 | 0.46 |
| 3# | 52.62 | 32.73 | 3.94 | 2.94 | 2.33 | 0.65 |
The parameters of 1#, 2#, 3# modified low carbon cement obtained by grinding 1#, 2# and 3# low carbon cement with magnesium hydroxide powder are shown in table 2.
TABLE 2 modified Low carbon Cement parameters
The adopted filter pressing soil and the sieve material are provided by a Huaxin cement sunny new aggregate factory, wherein the particle size of the sieve material is 5-10 mm, and the water content is 3%; the water content of the filter-pressing soil is 18 percent, the washing fineness is 20 percent of 80um screen residue, and the filter-pressing soil comprises the following main minerals in percentage by mass: 14.5% of quartz, 5.9% of clinopodium, 1.6% of illite, 14.5% of muscovite, 9.3% of dolomite and 54.2% of calcite.
The adopted magnesium hydroxide is a commercial product, and the purity is 80-98%.
The adopted Huaxin cement (Yanxin) factory cooling kiln tail flue gas and CO in the flue gas after water removal 2 The concentration is more than 20vol%, the temperature is 90-130 ℃, after purification and pressurization, the concentration can reach 20-60%, and the pressure is 0.1-0.5 MPa.
Example 1
A cement brick and a hydration carbonization cooperative maintenance process comprise the following steps:
1) Preparing a mixture: mixing 23 parts (by weight, the same below) of 1# low-carbon cement clinker with 0.8 part of magnesium hydroxide, grinding for 40min to obtain 1# modified low-carbon cement, placing 23.8 parts of the obtained 1# modified low-carbon cement, 41 parts of screening material and 45 parts of filter pressing soil in a forced mixer, stirring for 40s at the rotating speed of 1000r/min, and uniformly mixing to obtain a mixture with the particle size of less than 10mm, wherein the water content of the mixture is 9.3%;
2) Green brick forming: placing the obtained mixture in a static pressure brick machine, pressing for 4s under the forming pressure of 5MPa to form a green brick with the size of 240 multiplied by 115 multiplied by 53mm;
3) Pre-curing the green bricks: drying and pre-curing the green bricks by using the waste heat of the tail gas of the cement kiln; wherein the adopted pre-curing temperature is 120 ℃, and the time is 0.5h; the water content of the pre-cured green brick is 7%;
4) And (3) green brick carbonization and maintenance: placing the pre-cured green brick in a carbonization kettle, heating to 70 ℃, introducing carbon dioxide, and controlling CO 2 The concentration is 60vol%, the maintenance is carried out for 7.5h under the pressure of 0.30MPa, and the final relative humidity in the kettle is 100%.
Example 2
A cement brick and a hydration carbonization cooperative maintenance process comprise the following steps:
1) Preparing a mixture: mixing 20 parts of 3# low-carbon cement clinker with 0.7 part of magnesium hydroxide, grinding for 50min to obtain 3# modified low-carbon cement, then placing 20.7 parts of the obtained 3# modified low-carbon cement, 41 parts of screening material and 48 parts of filter pressing soil into a forced mixer, stirring at the rotating speed of 1200r/min for 60s, and uniformly mixing to obtain a mixture with the particle size of less than 10mm, wherein the water content of the mixture is 9.9%;
2) Green brick forming: placing the obtained mixture in a static pressure brick machine, pressing for 6s under the forming pressure of 3MPa to form a green brick with the size of 240 multiplied by 115 multiplied by 53mm;
3) Pre-curing the green bricks: drying and pre-curing the green bricks by using the waste heat of the tail gas of the cement kiln; wherein the adopted pre-curing temperature is 130 ℃, and curing is carried out for 2 hours; the water content of the pre-cured green brick is 3 percent;
4) And (3) green brick carbonization and maintenance: placing the adobe obtained by pre-curing in a carbonization kettle, heating to 50 ℃, introducing carbon dioxide, and controlling CO 2 The concentration is 33vol%, the maintenance is carried out for 10h under the pressure of 0.30MPa, and the final relative humidity in the kettle is 100%.
Example 3
A cement brick and a hydration carbonization cooperative maintenance process comprise the following steps:
1) Preparing a mixture: mixing 22 parts of 2# low-carbon cement clinker and 1.4 parts of magnesium hydroxide, grinding for 30min to obtain 2# modified low-carbon cement, then placing 23.4 parts of the obtained 2# modified low-carbon cement, 42 parts of screening material and 44 parts of filter pressing soil in a forced mixer, stirring for 45s at the rotating speed of 800r/min, and uniformly mixing to obtain a mixture with the particle size of less than 10mm, wherein the water content of the mixture is 9.2%;
2) Green brick forming: placing the obtained mixture in a static pressure brick machine, pressing for 8s under the forming pressure of 4MPa to form a green brick with the size of 240 multiplied by 115 multiplied by 53mm;
3) Pre-curing the green bricks: drying and pre-curing the green bricks by using the waste heat of the tail gas of the cement kiln; wherein the adopted pre-curing temperature is 110 ℃, and the time is 1h; the water content of the pre-cured green brick is 7%;
4) And (3) green brick carbonization and maintenance: purification of cement kiln tail gas to 50vol% CO 2 The concentration, namely placing the adobes obtained by pre-curing in a carbonization kettle, heating to 70 ℃, and then introducing purified cement kiln tail flue gas; maintaining the pressure at 0.4MPa for 6h, and then performing kettle maintenanceInternal final relative humidity 100%.
Comparative example 1
A cement brick and a hydration carbonization cooperative maintenance process comprise the following steps:
1) Preparing a mixture: mixing 20 parts of 3# low-carbon cement clinker with 0.7 part of magnesium hydroxide, grinding for 50min to obtain 3# modified low-carbon cement, then placing 20.7 parts of the obtained 3# modified low-carbon cement, 41 parts of screening material and 48 parts of filter pressing soil into a forced mixer, stirring for 60s at the rotating speed of 1200r/min, and uniformly mixing to obtain a mixture with the particle size of less than 10mm, wherein the water content of the mixture is 9.9%;
2) Green brick forming: placing the obtained mixture in a static-pressure brick machine, pressing for 6s under the forming pressure of 3MPa to form a green brick with the size of 240 multiplied by 115 multiplied by 53mm;
3) And (3) green brick carbonization and maintenance: placing the adobe obtained by pre-curing in a carbonization kettle, heating to 50 ℃, introducing carbon dioxide, and controlling CO 2 The concentration was 33vol%, the curing was carried out under a holding pressure of 0.30MPa for 10 hours (denoted as a) and 12 hours (denoted as b), and the final relative humidity in the autoclave was 100%.
Comparative example 2
A cement brick and a hydration carbonization cooperative maintenance process comprise the following steps:
1) Preparing a mixture: mixing 20 parts of 3# low-carbon cement clinker with 0.7 part of magnesium hydroxide, grinding for 50min to obtain 3# modified low-carbon cement, then placing 20.7 parts of the obtained 3# modified low-carbon cement, 41 parts of screening material and 48 parts of filter pressing soil into a forced mixer, stirring for 60s at the rotating speed of 1200r/min, and uniformly mixing to obtain a mixture with the particle size of less than 10mm and the water content of 9.9%;
2) Green brick molding: placing the obtained mixture in a static pressure brick machine, pressing for 6s at a forming pressure of 3MPa to prepare a green brick with the size of 240 multiplied by 115 multiplied by 53mm;
3) Pre-curing the green bricks: drying and pre-curing the green bricks by using the waste heat of the tail gas of the cement kiln; wherein the adopted pre-curing temperature is 130 ℃, and the time is 2 hours; the water content of the pre-cured green brick is 3%;
4) And (3) conventional hydration curing of the green brick: placing the pre-cured green brick in a carbonization box, heating to 50 ℃, and introducing no CO 2 Only the air environment is kept, the pressure in the kettle is controlled to be 0.30MPa, and the relative humidity is controlledAnd (5) curing for 10 hours at the rate of 60 percent.
Comparative example 3
A cement brick and a hydration carbonization cooperative maintenance process comprise the following steps:
1) Preparing a mixture: grinding 1# low-carbon cement clinker for 40min to obtain 4# low-carbon cement, then placing 23.8 parts of 4# low-carbon cement, 41 parts of screening material and 45 parts of filter pressing soil in a forced mixer, stirring for 40s at the rotating speed of 1000r/min, and uniformly mixing to obtain a mixture with the particle size of less than 10mm, wherein the water content of the mixture is 9.3%;
2) Green brick forming: placing the obtained mixture in a static pressure brick machine, pressing for 4s under the forming pressure of 5MPa to form a green brick with the size of 240 multiplied by 115 multiplied by 53mm;
3) Pre-curing the green bricks: drying and pre-curing the green bricks by using the waste heat of the tail gas of the cement kiln; wherein the adopted pre-curing temperature is 120 ℃, and the curing is carried out for 0.5h; the water content of the pre-cured green brick is 7%;
4) And (3) green brick carbonization and maintenance: placing the adobe obtained by pre-curing in a carbonization kettle, heating to 70 ℃, introducing carbon dioxide, and controlling CO 2 The concentration is 60vol%, the maintenance is carried out for 7.5h under the pressure of 0.30MPa, and the final relative humidity in the kettle is 100%.
Comparative example 4
A cement brick and a hydration carbonization cooperative maintenance process comprise the following steps:
1) Preparing a mixture: grinding 1# low-carbon cement clinker for 40min to obtain 4# low-carbon cement, then placing 23 parts of 4# low-carbon cement, 0.8 part of magnesium hydroxide, 41 parts of screening material and 45 parts of filter-pressing soil in a forced mixer, stirring for 40s at the rotating speed of 1000r/min, and uniformly mixing to obtain a mixture with the particle size of less than 10mm, wherein the water content of the mixture is 9.3%;
2) Green brick forming: placing the obtained mixture in a static pressure brick machine, pressing for 4s under the forming pressure of 5MPa to form a green brick with the size of 240 multiplied by 115 multiplied by 53mm;
3) Pre-curing the green bricks: drying and pre-curing the green bricks by using the waste heat of the tail gas of the cement kiln; wherein the adopted pre-curing temperature is 120 ℃, and the time is 0.5h; the water content of the pre-cured green brick is 7%;
4) And (3) green brick carbonization and maintenance: placing the pre-cured green brick in a carbonization kettle, heating to 70 DEG CIntroducing carbon dioxide to control CO 2 The concentration is 60vol%, the maintenance is carried out for 7.5h under the pressure of 0.30MPa, and the final relative humidity in the kettle is 100%.
The cement bricks obtained in examples 1 to 3 and comparative examples were subjected to performance tests such as mechanical properties, softening coefficient, freeze-thaw cycle and the like, and the results are shown in table 3.
TABLE 3 results of testing Properties of Cement bricks obtained in examples 1 to 3 and comparative examples 1 to 4
Wherein: the fixed carbon amount = the carbon absorption amount per brick/volume of each brick;
the carbonization weight gain ratio = the carbon absorption per brick/mass of cement per brick.
The above results show that: the cement brick obtained by the invention can show excellent mechanical property, softening coefficient, freezing-thawing cycle performance and the like, has excellent carbon fixing effect, can effectively shorten the preparation period of the cement brick, and has remarkable economic and environmental benefits.
It should be understood that the above preferred embodiments are only examples for clarity of description and are not limiting on the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are therefore intended to be included within the scope of the invention as claimed.
Claims (10)
1. The cement brick is characterized by comprising the following raw materials in parts by weight: 17 to 25 portions of low-carbon cement clinker, 0.7 to 1.4 portions of magnesium hydroxide, 26 to 54 portions of sieve material and 35 to 66 portions of filter pressing soil.
2. The cement brick according to claim 1, wherein the low-carbon cement clinker has a particle size of 5-50 mm, and each mineral composition and the mass percentage thereof comprise: 0 to 50% of CS and C 3 S 2 7～25％，γ-C 2 S0～10％，C 3 S8～22％，β-C 2 S11～33％，SiO 2 6～12％。
3. The cement brick as claimed in claim 1, wherein the undersize material is a mixture mainly composed of stone powder and clay fine particle materials formed by crushing and screening ores in the preparation process of aggregates; the grain diameter is 5-10 mm, and the water content is 3-8%.
4. The cement brick according to claim 1, wherein the filter-pressing soil is a mud block with a diameter of less than 10cm, which is obtained by pressing the waste after the aggregate is washed with water by a filter press; the main chemical compositions of the mud cake comprise: 50-60% of calcite, 10-20% of quartz, 5-25% of clay mineral and 18-20% of water content.
5. A method for producing a cement tile according to any one of claims 1 to 4, characterized by comprising the steps of:
1) Weighing raw materials: the raw materials and the weight portions thereof are as follows: 17-25 parts of low-calcium cement clinker, 0.7-1.4 parts of magnesium hydroxide, 26-54 parts of screening material and 35-66 parts of filter pressing soil;
2) Preparing modified low-carbon cement: mixing the weighed low-carbon cement clinker with magnesium hydroxide, and grinding to obtain modified low-carbon cement;
3) Preparing a mixture: mixing the modified low-carbon cement with the sieved material and the filter-pressed soil according to a ratio, and uniformly stirring to obtain a mixture;
4) Green brick forming: pressing and forming the obtained mixture to obtain a green brick;
5) Pre-curing the green bricks: drying and pre-curing the green bricks;
6) And (3) green brick hydration/carbonization curing: and carrying out hydration/carbonization curing on the obtained pre-cured green brick to obtain a final cement brick product.
6. The preparation method of claim 5, wherein the grinding time in the step 2) is 30-60 min, and the obtained modified product is low in contentThe Bo's specific surface area of the carbon cement is 290-400 m 2 /kg。
7. The preparation method according to claim 5, wherein the stirring step in step 3) is performed by a forced stirrer, the stirring time is 40-60 s, and the stirring speed is 300-1350r/min; the grain diameter of the obtained mixture is less than 10mm, and the water content is 8-13%.
8. The method according to claim 5, wherein the molding pressure used in step 4) is 3 to 5MPa for 3 to 10 seconds.
9. The preparation method of claim 5, wherein the pre-curing temperature adopted in the step 5) is 90-130 ℃ and the time is 0.5-7 h, and the water content of the obtained pre-cured green brick is 3-8%.
10. The method of claim 5, wherein the hydrating/carbonizing step uses process parameters including: CO 2 2 The concentration is 20-60 vol%, the pressure is 0.10-0.50 MPa, the temperature is 50-70 ℃, the relative humidity is 60-100%, and the curing time is 6-10 h.
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