CN115974475B - Cement brick and hydration carbonization synergistic maintenance process - Google Patents
Cement brick and hydration carbonization synergistic maintenance process Download PDFInfo
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- CN115974475B CN115974475B CN202211620966.6A CN202211620966A CN115974475B CN 115974475 B CN115974475 B CN 115974475B CN 202211620966 A CN202211620966 A CN 202211620966A CN 115974475 B CN115974475 B CN 115974475B
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- 239000004568 cement Substances 0.000 title claims abstract description 123
- 239000011449 brick Substances 0.000 title claims abstract description 111
- 238000003763 carbonization Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000036571 hydration Effects 0.000 title claims abstract description 28
- 238000006703 hydration reaction Methods 0.000 title claims abstract description 28
- 230000008569 process Effects 0.000 title claims abstract description 23
- 238000012423 maintenance Methods 0.000 title claims abstract description 17
- 230000002195 synergetic effect Effects 0.000 title abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 72
- 239000002689 soil Substances 0.000 claims abstract description 28
- 238000003825 pressing Methods 0.000 claims abstract description 26
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims abstract description 23
- 239000000347 magnesium hydroxide Substances 0.000 claims abstract description 23
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 19
- 238000000227 grinding Methods 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 15
- 238000002360 preparation method Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 13
- 238000010000 carbonizing Methods 0.000 claims description 9
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 229910052681 coesite Inorganic materials 0.000 claims description 6
- 229910052906 cristobalite Inorganic materials 0.000 claims description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 6
- 239000011707 mineral Substances 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 6
- 229910052682 stishovite Inorganic materials 0.000 claims description 6
- 229910052905 tridymite Inorganic materials 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 5
- 229910021532 Calcite Inorganic materials 0.000 claims description 3
- 239000002734 clay mineral Substances 0.000 claims description 3
- 239000000843 powder Substances 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
- 238000012216 screening Methods 0.000 claims description 2
- 238000005406 washing Methods 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
- 230000000887 hydrating effect Effects 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 17
- 239000010959 steel Substances 0.000 description 17
- 239000002893 slag Substances 0.000 description 16
- 239000000047 product Substances 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- 239000002918 waste heat Substances 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 230000003068 static effect Effects 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 239000004566 building material Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000003546 flue gas Substances 0.000 description 6
- 239000001569 carbon dioxide Substances 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 238000007599 discharging Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000010257 thawing Methods 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 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
- 238000011056 performance test Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000012744 reinforcing agent Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000003469 silicate cement Substances 0.000 description 2
- 239000008946 yang xin Substances 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- JYIBXUUINYLWLR-UHFFFAOYSA-N aluminum;calcium;potassium;silicon;sodium;trihydrate Chemical compound O.O.O.[Na].[Al].[Si].[K].[Ca] JYIBXUUINYLWLR-UHFFFAOYSA-N 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 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
- 229910001603 clinoptilolite Inorganic materials 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 239000011456 concrete brick Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 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
- 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
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 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
- 238000005185 salting out Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 230000004584 weight gain Effects 0.000 description 1
- 235000019786 weight gain Nutrition 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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 screen blanking and 35-66 parts of filter-pressed soil; mixing and grinding the low-carbon cement clinker and magnesium hydroxide to form modified low-carbon cement, scattering and mixing the obtained modified low-carbon cement with the screen blanking and filter pressing soil, uniformly stirring, pressing, drying, pre-curing, and hydration/carbonization synergistic curing. The invention takes modified low-carbon cement as a main cementing material, simultaneously introduces a large amount of cement industrial wastes such as screen blanking, filter pressing soil and the like, adopts a simpler hydration/carbonization cooperative maintenance process to prepare the cement brick, can effectively give consideration to good comprehensive use performance, obviously shortens the preparation period, 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 to prepare building material products has become an important point of current research. Steel slag is used as waste in iron and steel industry, and has the advantages of hydration activity under alkali excitation condition, etc. because of its high content of high temperature treated silica, it is often used as a mixed material resource for cement manufacture. In addition, the steel slag also contains air hardening silicate mineral, 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, common silicon cement, low-carbon cement and the like, some reports on preparing building material products by using the steel slag, the low-carbon cement, the silicate cement and the like as main raw materials for carbonization and hydration synergistic curing exist at present, and the advantages of high carbonization reaction rate are utilized, so that curing period and the like can be shortened to a certain extent, such as: patent CN109437828A discloses a steel slag carbonization and hydration cooperative curing process, which utilizes the chemical characteristics of steel slag, such as carbonization activity and hydration activity, and introduces a carbonization curing and prewetting ceramic sand internal curing cooperative mechanism (carbonization is performed before standard curing), so as to improve 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, raw materials such as carbonized cement, silicate cement, concrete aggregate tailing powder and the like are dry mixed and wet mixed and then are shaped by light pressure, and carbonized building prefabricated product is prepared through carbonization maintenance and natural standing maintenance (carbonization is performed before standard maintenance); 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, which are prepared by pre-curing raw materials such as steel slag, cement, stone and the like which are uniformly mixed, demolding, curing at low temperature, and curing in a carbonization environment for a period of time. However, the technical scheme based on the hydration and carbonization cooperative curing technology generally has higher CO 2 concentration requirement in the carbonization curing stage, and the total curing period of carbonization is still longer (the reaction efficiency still needs to be improved).
Therefore, the preparation process of the building material product is further explored simply and efficiently, and the method has important research and application significance.
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 mainly comprising steel slag; the method fully utilizes the existing raw materials and equipment conditions of a cement plant and adopts a simpler production process to prepare the hydration carbonization synergistic maintenance building material product, can efficiently treat various cement industrial wastes, breaks the limitation of the existing steel slag-based carbonization brick making technology, can effectively shorten the production period of cement bricks, gives consideration to the good comprehensive use performance of the obtained brick product, has important economic and environmental benefits, and is suitable for popularization and application.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The cement brick comprises the following raw materials in parts by weight: 17-25 parts of low-carbon cement clinker, 0.7-1.4 parts of magnesium hydroxide, 26-54 parts of screen blanking and 35-66 parts of filter-pressed 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 ：CS 0～50％,C3S27～25％,γ-C2S 0～10％,C3S 8～22％,β-C2S 11～33％,SiO26～12％.
In the scheme, the screen discharging is a mixture mainly composed of stone powder and clay fine particle materials, wherein the mixture is 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-pressed soil is a mud block with the diameter of less than 10cm, which is obtained by pressing the waste with the aggregate washed by water through a filter press; the main chemical composition of the mud cake comprises: 50-60% of calcite, 10-20% of quartz, 5-25% of clay mineral and 18-20% of water content.
In the above scheme, the clay mineral comprises one or more of chlorite, illite, kaolinite, mica and the like.
In the above scheme, in the raw materials of the cement brick, the low-carbon cement clinker and the magnesium hydroxide are 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 parts by weight 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 and 35-66 parts of filter-pressed soil;
2) Preparation of modified low-carbon cement: mixing the weighed low-carbon cement clinker with magnesium hydroxide, and grinding to obtain modified low-carbon cement;
3) Preparation of the mixture: uniformly mixing the modified low-carbon cement with the screen blanking and filter-pressed soil according to a proportion to prepare a mixture;
4) And (3) forming a green brick: pressing the obtained mixture to form a green brick;
5) Pre-curing the green bricks: drying and pre-curing the green bricks;
6) Carbonizing and curing the green bricks: and carbonizing and curing the obtained pre-cured green bricks to obtain the final cement brick product.
In the scheme, the grinding time in the step 2) is 30-60 min, and the Bo specific surface area of the obtained modified low-carbon cement is 290-400 m 2/kg.
In the scheme, the step 3) is carried out by adopting a forced stirrer for stirring for 40-60 s, and the stirring speed is 300-1350r/min; the particle size of the obtained mixture is smaller than 10mm, and the water content is 8-13%.
In the scheme, the green brick forming step in the step 4) adopts forming pressure of 3-5 MPa and time of 3-10 s.
In the scheme, in the step 5), the drying and pre-curing are preferably carried out by taking the waste heat of the kiln tail of the cement as a heat source, and the curing temperature is controlled to be 90-130 ℃ and the curing time is controlled to be 0.5-7 h; the water content of the obtained pre-cured green bricks is 3-8%.
Further, the curing time adopted in the drying and pre-curing step in the step 5) is preferably 0.5-2 h.
In the above scheme, the technological parameters adopted in the hydration/carbonization maintenance step in the step 6) include: the concentration of CO 2 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 above scheme, in the hydration/carbonization maintenance 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 ℃, the concentration of CO 2 is 14-16 vol% and the concentration of water vapor is 7-14 vol%.
The principle of the invention is as follows:
According to the invention, the ground modified low-carbon cement is taken as a main cementing material, a small amount of magnesium hydroxide serving as a reinforcing agent is doped in the traditional grinding process of the low-carbon cement clinker, so that the effective combination of the magnesium hydroxide and the low-carbon cement clinker is promoted, the modification effect of the magnesium hydroxide is ensured, the modified low-carbon cement is prepared, and then the modified low-carbon cement is mixed with a large amount of introduced cement industrial wastes such as screen blanking and filter pressing soil and the like, and is combined with 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 a stirrer, and the scouring effect of the mixture is overlapped when the materials are mixed to form small-size soil; sieving, fully stirring and uniformly mixing the sieving, soil and modified low-carbon cement (low-carbon clinker, magnesium hydroxide and grinding process); in the press forming stage, the framework of the green brick is formed by screen blanking to exert a supporting effect, and the filter pressing soil and the modified low-carbon cement are filled between the frameworks together to compact and stabilize the green body; in the process of drying and pre-curing treatment, part of moisture introduced by filter-pressed soil and screen discharging in the green bricks is dried and discharged, a gas diffusion channel is reserved for carbonization in the next stage, and hydraulic components in cement are rapidly hydrated to generate hydrated calcium silicate to provide certain early strength, and calcium hydroxide is generated at the same time; in addition, the introduced magnesium hydroxide increases the alkalinity of the system on the one hand, is beneficial to the stable existence of carbonate which is a carbonization reaction product and promotes the forward carbonization reaction; on the other hand, the magnesium ions can increase nucleation sites in the carbonization precipitation crystallization process, inhibit growth (relative) of carbonate crystals, refine crystal grains, increase the specific surface area of the obtained carbonization reaction product, further promote the improvement of carbonization reaction efficiency and carbonization degree, and effectively consider the mechanical property, softening coefficient, freeze-thawing 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 greatly treat two industrial waste residues of the screen blanking and the filter-pressing soil in the aggregate production process, fully utilizes the physical characteristics of the two raw materials, and further improves the performance of cement brick products;
2) The consumption of the cementing material is small, and in the existing carbonization technology of steel slag or steel slag and cement, the consumption of the cementing material such as steel slag is generally more than 40%; the content of the introduced Mg (OH) 2 reinforcing agent is low (the influence on the cost is not great), meanwhile, mg (OH) 2 is introduced into the conventional grinding process of the low-carbon clinker for grinding pretreatment, and on the premise of not additionally increasing working procedures and energy consumption, the carbonization efficiency and carbonization degree of the obtained mixture can be effectively improved, and the comprehensive usability of the obtained cement brick is obviously improved;
3) In the process steps of the drying pre-curing and hydration carbonization synergetic curing, the waste heat of the tail gas of the cement kiln can be further fully utilized, CO 2 in the tail gas can be effectively cured, and the carbon emission of a cement plant is reduced;
4) The carbonization maintenance process condition is simple, the production period can be obviously shortened, and the industrial production is easy to realize;
5) The standard brick product with hydration carbonization synergistic maintenance has excellent performance and meets the standard requirements of MU15 concrete bricks.
Detailed Description
The invention is not limited to the embodiments described above, but a number of modifications and adaptations can be made by a person skilled in the art without departing from the principle of the invention, which modifications and adaptations are also considered to be within the scope of the invention. What is not described in detail in this specification is prior art known to those skilled in the art.
In the following examples, three low carbon cement clinker (1 #, 2#, 3 #) were used, which were provided by Hua Xinjin Long Shuini (Yun County) limited, wherein the main mineral composition of the 1# low carbon cement clinker and its mass percentages are: c 3S 21％,β-C2S 33％,C3S225％,SiO2% by weight; the main mineral composition of the No. 2 low-carbon cement clinker and the mass percentage thereof are ：C3S 13％、β-C2S 18％、γ-C2S 10％、CS 30％、C3S28％、SiO28％;3#, and the main mineral composition of the low-carbon cement clinker and the mass percentage thereof are as follows: c 3S 22％、β-C2S 31％、CS 26％、C3S28％、SiO2%; the particle size of the three low-carbon cement clinker particles is 5-50 mm, and the chemical composition is shown in table 1.
TABLE 1 chemical composition (wt%) of Low carbon Cement clinker
| Low-carbon cement clinker | CaO | SiO2 | Al2O3 | Fe2O3 | MgO | SO3 |
| 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 |
Parameters of the modified low-carbon cement of No. 1, no. 2 and No. 3 obtained by grinding the low-carbon cement of No. 1, no. 2 and No. 3 with magnesium hydroxide are shown in Table 2.
Table 2 modified low carbon cement parameters
The adopted filter pressing soil and screen discharging are provided by a Huaxin cement Yangxin aggregate factory, wherein the grain size of the screen discharging is 5-10 mm, and the water content is 3%; the water content of the filter pressing soil is 18%, the washing fineness is 80um screen residue is 20%, and the main mineral composition and the mass percentage are as follows: 14.5% of quartz, 5.9% of clinoptilolite, 1.6% of illite, 14.5% of muscovite, 9.3% of dolomite and 54.2% of calcite.
The magnesium hydroxide is a commercial product, and the purity is 80-98%.
The temperature of the kiln tail flue gas is reduced by adopting the Huaxin cement (Yangxin) factory, the concentration of CO 2 in the flue gas after water removal is more than 20vol percent, the temperature is 90-130 ℃, and the concentration can reach 20-60 percent after purification and pressurization, and the pressure is 0.1-0.5 MPa.
Example 1
A cement brick and hydration carbonization cooperative curing process comprises the following steps:
1) Preparing a mixture: mixing 23 parts (weight parts, the same applies below) of 1# low-carbon cement clinker and 0.8 part of magnesium hydroxide, grinding for 40min to obtain 1# modified low-carbon cement, putting 23.8 parts of the obtained 1# modified low-carbon cement and 41 parts of screen blanking and 45 parts of filter pressing soil into a forced mixer, stirring for 40s at a rotating speed of 1000r/min, and uniformly mixing to obtain a mixture with a particle size of less than 10mm, wherein the water content is 9.3%;
2) And (3) forming a green brick: placing the obtained mixture into a static brick press, and pressing for 4s into green bricks with the size of 240 multiplied by 115 multiplied by 53mm under the molding pressure of 5 MPa;
3) Pre-curing the green bricks: adopts the waste heat of the tail gas of the cement kiln to pair baking and pre-curing the green bricks; wherein the pre-curing temperature is 120 ℃ and the time is 0.5h; the water content of the obtained pre-cured green bricks is 7%;
4) Carbonizing and curing the green bricks: and (3) placing the brick blank obtained by the pre-curing in a carbonization kettle, heating to 70 ℃, introducing carbon dioxide, controlling the concentration of CO 2 to 60vol%, maintaining the pressure to 0.30MPa, and curing for 7.5 hours, wherein the final relative humidity in the kettle is 100%.
Example 2
A cement brick and hydration carbonization cooperative curing process comprises the following steps:
1) Preparing a mixture: mixing 20 parts of 3# low-carbon cement clinker and 0.7 part of magnesium hydroxide, grinding for 50min to obtain 3# modified low-carbon cement, putting 20.7 parts of the 3# modified low-carbon cement, 41 parts of screen discharging and 48 parts of filter pressing soil into a forced mixer, stirring at a rotating speed of 1200r/min for 60s, and uniformly mixing to obtain a mixture with a particle size of less than 10mm, wherein the water content is 9.9%;
2) And (3) forming a green brick: placing the obtained mixture into a static brick press, and pressing for 6s into green bricks with the size of 240 multiplied by 115 multiplied by 53mm under the forming pressure of 3 MPa;
3) Pre-curing the green bricks: adopts the waste heat of the tail gas of the cement kiln to pair baking and pre-curing the green bricks; wherein the adopted pre-curing temperature is 130 ℃, and curing is carried out for 2 hours; the water content of the obtained pre-cured green bricks is 3 percent;
4) Carbonizing and curing the green bricks: and (3) placing the brick blank obtained by the pre-curing in a carbonization kettle, heating to 50 ℃, introducing carbon dioxide, controlling the concentration of CO 2 to 33vol%, maintaining the pressure to 0.30MPa, and curing for 10 hours, wherein the final relative humidity in the kettle is 100%.
Example 3
A cement brick and hydration carbonization cooperative curing process comprises 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, putting 23.4 parts of the 2# modified low-carbon cement, 42 parts of screen blanking and 44 parts of filter pressing soil into a forced mixer, stirring for 45s at a speed of 800r/min, and uniformly mixing to obtain a mixture with a particle size of less than 10mm, wherein the water content is 9.2%;
2) And (3) forming a green brick: placing the obtained mixture into a static brick press, and pressing for 8s into green bricks with the size of 240 multiplied by 115 multiplied by 53mm under the molding pressure of 4 MPa;
3) Pre-curing the green bricks: adopts the waste heat of the tail gas of the cement kiln to pair baking and pre-curing the green bricks; wherein the pre-curing temperature is 110 ℃ and the time is 1h; the water content of the obtained pre-cured green bricks is 7%;
4) Carbonizing and curing the green bricks: purifying the cement kiln tail flue gas to 50vol% CO 2 concentration, placing the brick blank obtained by pre-curing in a carbonization kettle, heating to 70 ℃, and then introducing the purified cement kiln tail flue gas; maintaining the pressure at 0.4MPa for 6h, wherein the final relative humidity in the kettle is 100%.
Comparative example 1
A cement brick and hydration carbonization cooperative curing process comprises the following steps:
1) Preparing a mixture: mixing 20 parts of 3# low-carbon cement clinker and 0.7 part of magnesium hydroxide, grinding for 50min to obtain 3# modified low-carbon cement, placing 20.7 parts of the 3# modified low-carbon cement, 41 parts of screen blanking and 48 parts of filter pressing soil in a forced mixer, stirring for 60s at a rotation speed of 1200r/min, and uniformly mixing to obtain a mixture with a particle size of less than 10mm, wherein the water content is 9.9%;
2) And (3) forming a green brick: placing the obtained mixture into a static brick press, and pressing for 6s into green bricks with the size of 240 multiplied by 115 multiplied by 53mm under the forming pressure of 3 MPa;
3) Carbonizing and curing the green bricks: and (3) placing the brick blank obtained by the pre-curing in a carbonization kettle, heating to 50 ℃, introducing carbon dioxide, controlling the concentration of CO 2 to 33vol%, and maintaining the pressure at 0.30MPa for 10 hours (marked as a) and 12 hours (marked as b), wherein the final relative humidity in the kettle is 100%.
Comparative example 2
A cement brick and hydration carbonization cooperative curing process comprises the following steps:
1) Preparing a mixture: mixing 20 parts of 3# low-carbon cement clinker and 0.7 part of magnesium hydroxide, grinding for 50min to obtain 3# modified low-carbon cement, placing 20.7 parts of the 3# modified low-carbon cement, 41 parts of screen blanking and 48 parts of filter-pressed soil into a forced mixer, stirring for 60s at a rotation speed of 1200r/min, and uniformly mixing to obtain a mixture with a particle size of less than 10mm, wherein the water content is 9.9%;
2) And (3) forming a green brick: placing the obtained mixture in a static brick press, and pressing for 6s at a forming pressure of 3MPa to prepare a green brick, wherein the size of the green brick is 240 multiplied by 115 multiplied by 53mm;
3) Pre-curing the green bricks: adopts the waste heat of the tail gas of the cement kiln to pair baking and pre-curing the green bricks; wherein the pre-curing temperature is 130 ℃ and the time is 2 hours; the water content of the obtained pre-cured green bricks is 3%;
4) And (3) conventional hydration maintenance of green bricks: and (3) placing the brick blank obtained by pre-curing in a carbonization box, heating to 50 ℃, and curing for 10 hours under the conditions that the pressure in the kettle is 0.30MPa and the relative humidity is 60% without introducing CO 2 and only maintaining the air environment.
Comparative example 3
A cement brick and hydration carbonization cooperative curing process comprises the following steps:
1) Preparing a mixture: grinding the 1# low-carbon cement clinker for 40min to obtain 4# low-carbon cement, putting 23.8 parts of the 4# low-carbon cement, 41 parts of screen blanking and 45 parts of filter pressing soil into a forced mixer, stirring for 40s at a speed of 1000r/min, and uniformly mixing to obtain a mixture with the particle size of less than 10mm, wherein the water content is 9.3%;
2) And (3) forming a green brick: placing the obtained mixture into a static brick press, and pressing for 4s into green bricks with the size of 240 multiplied by 115 multiplied by 53mm under the molding pressure of 5 MPa;
3) Pre-curing the green bricks: adopts the waste heat of the tail gas of the cement kiln to pair baking and pre-curing the green bricks; wherein the adopted pre-curing temperature is 120 ℃, and curing is carried out for 0.5h; the water content of the obtained pre-cured green bricks is 7%;
4) Carbonizing and curing the green bricks: and (3) placing the brick blank obtained by the pre-curing in a carbonization kettle, heating to 70 ℃, introducing carbon dioxide, controlling the concentration of CO 2 to 60vol%, maintaining the pressure to 0.30MPa, and curing for 7.5 hours, wherein the final relative humidity in the kettle is 100%.
Comparative example 4
A cement brick and hydration carbonization cooperative curing process comprises the following steps:
1) Preparing a mixture: grinding the 1# low-carbon cement clinker for 40min to obtain 4# low-carbon cement, putting 23 parts of the 4# low-carbon cement, 0.8 part of magnesium hydroxide, 41 parts of screen blanking and 45 parts of filter pressing soil into a forced mixer, stirring for 40s at a rotating speed of 1000r/min, and uniformly mixing to obtain a mixture with the particle size of less than 10mm, wherein the water content is 9.3%;
2) And (3) forming a green brick: placing the obtained mixture into a static brick press, and pressing for 4s into green bricks with the size of 240 multiplied by 115 multiplied by 53mm under the molding pressure of 5 MPa;
3) Pre-curing the green bricks: adopts the waste heat of the tail gas of the cement kiln to pair baking and pre-curing the green bricks; wherein the pre-curing temperature is 120 ℃ and the time is 0.5h; the water content of the obtained pre-cured green bricks is 7%;
4) Carbonizing and curing the green bricks: and (3) placing the brick blank obtained by the pre-curing in a carbonization kettle, heating to 70 ℃, introducing carbon dioxide, controlling the concentration of CO 2 to 60vol%, maintaining the pressure to 0.30MPa, and curing for 7.5 hours, wherein the final relative humidity in the kettle is 100%.
The cement bricks obtained in examples 1 to 3 and comparative example were subjected to performance tests of mechanical properties, softening coefficients, freeze-thawing cycles and the like, and the results are shown in Table 3.
TABLE 3 Performance test results of the cement bricks obtained in examples 1 to 3 and comparative examples 1 to 4
Wherein: carbon fixation = carbon uptake per brick/volume per brick;
carbonization weight gain = carbon pick-up per brick/mass of cement per brick.
The above results indicate that: the cement brick obtained by the invention can show better mechanical property, softening coefficient, freeze thawing cycle performance and the like, has better carbon fixing effect, can effectively shorten the preparation period of the cement brick, and has obvious economic and environmental benefits.
It is apparent that the above preferred embodiments are examples only for clarity of illustration and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And thus obvious variations or modifications to the disclosure are within the scope of the invention.
Claims (8)
1. The cement brick is characterized by comprising the following raw materials in parts by weight: 17-25 parts of low-carbon cement clinker, 0.7-1.4 parts of magnesium hydroxide, 26-54 parts of screen blanking and 35-66 parts of filter-pressed soil;
the particle size of the low-carbon cement clinker is 5-50 mm, and the mineral composition and the mass percentage thereof comprise ：CS 0～50％,C3S2 7～25％,γ-C2S 0～10％,C3S 8～22％,β-C2S11～33％,SiO2 6～12％;
The filter-pressed soil is a mud block with the diameter of less than 10cm, which is obtained by pressing wastes with aggregate water washing through a filter press; the main chemical composition of the mud cake comprises: 50-60% of calcite, 10-20% of quartz, 5-25% of clay mineral and 18-20% of water content;
In the raw materials of the cement brick, firstly, low-carbon cement clinker and magnesium hydroxide are mixed and ground to prepare modified low-carbon cement.
2. The cement brick according to claim 1, wherein the screen blanking is a mixture mainly composed of stone powder and clay fine particle materials formed by crushing and screening ores in the process of preparing aggregates; the grain diameter is 5-10 mm, and the water content is 3-8%.
3. The method for preparing the cement brick according to any one of claims 1 to 2, which is characterized by comprising the following steps:
1) Weighing raw materials: the raw materials and the parts by weight thereof are as follows: 17-25 parts of low-calcium cement clinker, 0.7-1.4 parts of magnesium hydroxide, 26-54 parts of screen blanking and 35-66 parts of filter-pressed soil;
2) Preparation of modified low-carbon cement: mixing the weighed low-carbon cement clinker with magnesium hydroxide, and grinding to obtain modified low-carbon cement;
3) Preparation of the mixture: mixing the modified low-carbon cement with the screen blanking and filter-pressed soil according to a proportion, and uniformly stirring to obtain a mixture;
4) And (3) forming a green brick: pressing and molding the obtained mixture to obtain green bricks;
5) Pre-curing the green bricks: drying and pre-curing the green bricks;
6) Hydration/carbonization maintenance of green bricks: and (5) hydrating/carbonizing the obtained pre-cured green bricks to obtain the final cement brick products.
4. The method according to claim 3, wherein the grinding time of the step 2) is 30-60 min, and the Bo specific surface area of the obtained modified low-carbon cement is 290-400 m 2/kg.
5. The preparation method according to claim 3, wherein the stirring step of the step 3) adopts a forced stirrer for stirring for 40-60 s at a stirring rate of 300-1350r/min; the particle size of the obtained mixture is smaller than 10mm, and the water content is 8-13%.
6. The process according to claim 3, wherein the molding pressure used in step 4) is 3 to 5MPa and the time is 3 to 10s.
7. The method according to claim 3, wherein the pre-curing temperature used in step 5) is 90-130 ℃ for 0.5-7 hours, and the water content of the obtained pre-cured green brick is 3-8%.
8. A method according to claim 3, wherein the hydration/carbonization maintenance step employs process parameters comprising: CO 2 concentration 20-60 vol%, pressure 0.10-0.50 MPa, temperature 50-70 deg.c, relative humidity 60-100% and curing time 6-10 hr.
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| CN112408898A (en) * | 2020-11-26 | 2021-02-26 | 华新水泥股份有限公司 | Process for producing baking-free type filter-pressing soil tailing bricks through cogeneration and co-maintenance of cement plant |
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| CN107056202A (en) * | 2017-05-31 | 2017-08-18 | 盐城工学院 | Carbonization slag cement prepares accelerator and its application process of low-carbon binder materials |
| CN112408898A (en) * | 2020-11-26 | 2021-02-26 | 华新水泥股份有限公司 | Process for producing baking-free type filter-pressing soil tailing bricks through cogeneration and co-maintenance of cement plant |
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