CN117049805A - Preparation method of cementing material with ammonia alkali white mud-slag-fly ash as raw material - Google Patents
Preparation method of cementing material with ammonia alkali white mud-slag-fly ash as raw material Download PDFInfo
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- CN117049805A CN117049805A CN202311322736.6A CN202311322736A CN117049805A CN 117049805 A CN117049805 A CN 117049805A CN 202311322736 A CN202311322736 A CN 202311322736A CN 117049805 A CN117049805 A CN 117049805A
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- alkali
- slag
- mud
- fly ash
- white mud
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 239000003513 alkali Substances 0.000 title claims abstract description 98
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 64
- 239000000463 material Substances 0.000 title claims abstract description 62
- 239000010881 fly ash Substances 0.000 title claims abstract description 43
- 239000002994 raw material Substances 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000011499 joint compound Substances 0.000 claims abstract description 114
- 239000002893 slag Substances 0.000 claims abstract description 40
- 150000003839 salts Chemical class 0.000 claims abstract description 38
- 238000000227 grinding Methods 0.000 claims abstract description 37
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims description 54
- 239000004576 sand Substances 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 25
- 239000002245 particle Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 10
- 229910021532 Calcite Inorganic materials 0.000 claims description 7
- 229910052801 chlorine Inorganic materials 0.000 claims description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 6
- 239000010440 gypsum Substances 0.000 claims description 6
- 229910052602 gypsum Inorganic materials 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- 229910052599 brucite Inorganic materials 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 239000003245 coal Substances 0.000 claims description 2
- 239000003546 flue gas Substances 0.000 claims description 2
- 238000009628 steelmaking Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 8
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract description 2
- 239000004566 building material Substances 0.000 abstract description 2
- 229910001653 ettringite Inorganic materials 0.000 abstract description 2
- 229910002808 Si–O–Si Inorganic materials 0.000 abstract 1
- 238000006116 polymerization reaction Methods 0.000 abstract 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 7
- 239000002910 solid waste Substances 0.000 description 6
- 239000004568 cement Substances 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 235000010755 mineral Nutrition 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 235000017550 sodium carbonate Nutrition 0.000 description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000010902 straw Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 150000003841 chloride salts Chemical class 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- -1 NaCl) Chemical class 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000003068 static effect Effects 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
- C04B7/24—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
- C04B7/14—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
- C04B7/36—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
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
-
- 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
Abstract
The application provides a preparation method of a cementing material taking alkali-ammonia white mud-slag-fly ash as a raw material, which belongs to the technical field of building materials, and comprises the following steps of: 50-70% of slag, 5-25% of fly ash and 20-50% of alkali-ammonia white mud. Mixing and grinding the ammonia alkali white mud, slag and fly ash according to a proportion, and sorting to obtain the final ammonia alkali white mud-based cementing material. The cementing material provided by the application can effectively excite slag and fly ash by utilizing sulfate, chloride and alkaline substances in the ammonia alkali white mud, promote depolymerization and polymerization of multiple valence bonds such as Si-O-Si, si-O-Al, al-O-Al and the like in the slag and the fly ash, generate ettringite, C-S-H gel and Friedel salt, further improve the strength of hardened slurry of the cementing material, and simultaneously has low preparation cost and is beneficial to exerting the performance advantages of different raw materials.
Description
Technical Field
The application belongs to the technical field of building materials, and particularly relates to a preparation method of a cementing material taking alkali-ammonia white mud-slag-fly ash as a raw material.
Background
The ammonia alkali white mud is solid waste generated in the process of preparing sodium carbonate by an ammonia alkali method. Along with the rapid development of national economy, the demand of sodium carbonate as an important basic raw material is increased year by year, and the discharge of ammonia alkali white mud is increased. However, the granularity of the ammonia alkali white mud particles is finer, the water content is higher, and meanwhile, a large amount of chlorides are contained, so that the recycling is difficult, and most of the actual economic value of the ammonia alkali white mud resources in China is not effectively utilized. A large amount of ammonia-soda white mud can only be piled up by building a dam according to local conditions, not only occupies a large amount of land, but also has potential safety hazards such as collapse, landslide and the like, and the treatment of the ammonia-soda white mud becomes a common problem which puzzles the soda industry for many years.
Patent CN202310203033.5 discloses a method for preparing bentonite from alkaline residue. The soda ash residue is used for replacing lime, and is matched with slag, clay and other materials in different mass ratios to prepare the low-cost high-strength triple clay. However, the method needs to purify the alkaline residue, minerals in the alkaline residue are not fully utilized, the utilization added value of the alkaline residue is low, and the soluble chloride in the alkaline residue can cause serious harm to the environment.
Patent CN02310087783.0 discloses a biochar prepared from alkaline residue and straw and its application in dephosphorization and demanganization. The alkali slag is used as a modified material, the straw is used as a biochar base, and the modified biochar is generated by co-pyrolysis at high temperature. The technology realizes the recycling of the alkaline residue and the straw, has higher phosphate absorption efficiency, but the using amount of the biochar is much less than the generating amount of the alkaline residue, and is difficult to use the alkaline residue on a large scale.
Patent CN202211388093.0 discloses a method for preparing foam lightweight soil based on alkaline residue. The technology prepares alkali slag with chloride ion content less than 1% through pulping, electrolysis, press filtration, crushing and other processes, and prepares foam light soil by mixing with waste concrete powder and cement. The technology avoids the problem of low strength caused by dissolution and loss of alkali residue chloride in the foam light soil, but the technology can generate a large amount of waste liquid in the electrolytic chlorine removal process, so that the environment is polluted, and meanwhile, the technology is relatively complex, the cost is high, and the technology is difficult to apply on a large scale.
Patent CN202211437289.4 discloses a cementing material containing a large amount of wet alkali residue and a preparation method and application thereof. The technology utilizes wet alkali residue, slag and excitant to prepare the cementing material, needs to be mixed with sodium hydroxide and sodium carbonate composite excitant, has the advantages of green and lower environmental protection performance, and has higher excitant cost and lower 28 d strength of only 30-35 MPa.
At present, the utilization rate of the ammonia alkali white mud is not high, and how to realize the effective utilization of the alkali slag under the conditions of low cost and low energy consumption is still a problem to be solved at present. According to the physicochemical properties of the alkaline residue, the preparation of the cementing material by using the alkaline residue is widely concerned.
Disclosure of Invention
The embodiment of the application provides a preparation method of a cementing material taking alkali-ammonia white mud-slag-fly ash as a raw material, which aims to solve the problems of low alkali-ammonia white mud utilization rate, high utilization cost, secondary pollution to the environment and the like.
In order to achieve the above object, the present application adopts the following technical scheme: the cementing material using the ammonia alkali white mud-slag-fly ash as a raw material comprises the following components in percentage by mass: 50-70% of slag, 5-25% of fly ash and 20-50% of alkali-ammonia white mud.
With reference to the first aspect, in one implementation, the ammonia soda lime mud includes one or more of lime mud, salt mud, and soda sand; the slag is water quenched and granulated blast furnace slag generated in the blast furnace steelmaking process; the fly ash is powder collected in flue gas of a pulverized coal furnace of a power plant.
With reference to the first aspect, in one implementation manner, the main components of the white mud are 10% -20% of chloride salt, 20% -35% of calcite and 30% -40% of gypsum; the main components of the salty mud are 60% -80% of gypsum, 5% -10% of brucite and 1% -1% of chloride; the main components of the alkali sand are 30% -40% of hydroxycalcite, 40% -60% of calcite and 1% -2% of chloride.
The main chemical composition of the white mud is as follows: 30% -50% of CaO, 5% -15% of MgO and Al 2 O 3 0~5%、SiO 2 5%~15%、Na 2 O 0~3%、SO 3 6%~12%、K 2 O 0~1%、Fe 2 O 3 0~2%、Cl 10%~13%；
The main chemical composition of the salt mud is as follows: 20% -35% of CaO, 15% -30% of MgO and Al 2 O 3 0~5%、SiO 2 0%~5%、Na 2 O 0~4%、SO 3 20%~35%、K 2 O 0~1%、Fe 2 O 3 0~2%、Cl 0%~3%；
The alkali sand mainly comprises the following chemical components: 50% -70% of CaO, 3% -8% of MgO and Al 2 O 3 2~8%、SiO 2 5%~15%、Na 2 O 0~3%、SO 3 0%~3%、K 2 O 0~1%、Fe 2 O 3 0~2%、Cl 4%~6%。
In a second aspect, the embodiment of the application also provides a preparation method of the cementing material using the alkali-ammonia white mud-slag-fly ash as a raw material, which comprises the following steps:
firstly, because the fineness of the ammonia alkali white mud is finer and the water retention rate is better, the white mud or the salt mud is respectively subjected to pressure filtration until the water content is less than 50%, and then is scattered and dried, so that the water content of the white mud or the salt mud entering the grinding process flow is reduced, and the subsequent drying cost can be effectively reduced; then sending the ammonia alkali white mud into a dryer to be dried until the water content is less than 1%;
step two, because the alkali sand is relatively coarse, the process of scattering and airing is not needed, the alkali sand is directly dried until the water content is less than 1%, and then the alkali sand is sent into a ball mill for grinding; selecting powder from the ground alkali sand material to obtain alkali sand particles larger than 1mm and alkali sand particles smaller than 1 mm;
step three, alkali sand particles smaller than 1mm, dried salt mud and white mud are mixed in proportion and enter a first ball mill for grinding; meanwhile, the alkali sand particles larger than 1mm are sent back to the roller press for grinding and sorting again;
step four, the salt mud and white mud mixed materials which enter a first ball mill for grinding are separated by a powder separator, and the obtained mixed materials with the specific surface area of more than 500 square meters per kg are ammonia alkali white mud powder; returning the mixed material with the specific surface area smaller than 500 square meters per kg to the first ball mill for grinding again;
feeding the slag raw material into a vertical mill for grinding through a vibration feeder, drying under the action of a hot blast stove in the grinding process, and then sorting through a powder sorting machine to obtain slag powder with the specific surface area of more than 500 square meters per kg; slag with specific surface area less than 500 square meters per kg is returned to be ground again and separated;
and step six, mixing the ammonia alkali white mud powder, the slag powder and the fly ash in proportion, feeding the mixture into a second ball mill for grinding, and sorting the mixture to obtain the final ammonia alkali white mud-based cementing material.
With reference to the second aspect, in one implementation manner, in the sixth step, the water content of the gelling material is less than 1% and the specific surface area is greater than 500 square meters per kg.
With reference to the second aspect, in one implementation manner, in the first step, the white mud or the salt mud is respectively pressed and filtered by a press filter, scattered by a scattering machine, and dried by a rotary dryer.
With reference to the second aspect, in one implementation manner, in the second step, the alkali sand is dried by a rotary dryer, and is subjected to powder selection by a V-shaped powder selector after being ground.
With reference to the second aspect, in one implementation manner, in the fourth step, the salt slurry and white slurry mixed material ground by the first ball mill enters an O-type powder selecting machine for powder selecting.
With reference to the second aspect, in one implementation manner, in the fifth step, the slag raw material is sent into a vertical mill for grinding through a vibration feeder, dried through a hot blast stove, and then is subjected to powder selection through an O-type powder selector.
Compared with the prior art, the cementing material using the ammonia alkali white mud-slag-fly ash as the raw material has the beneficial effects that: the alkali white mud can be used as a cementing material component to well excite the activities of slag and fly ash. From the aspect of phase composition, alkaline substances in the ammonia alkali white mud can promote depolymerization of active silicon and aluminum bonds in mineral powder and fly ash, sulfate and soluble chloride in the ammonia alkali white mud contain a large amount of sulfate radicals and chloride ions, and can be recombined with the depolymerized bonds of the slag and the fly ash to generate hydraulic substances ettringite and Friedel salt, and carbonate particles in the ammonia alkali white mud can provide nucleation matrixes for hydration products to promote the strength increase of hydration slurry, and meanwhile, the preparation cost of the cementing material is low, so that the advantages of different raw material performances are favorably exerted, and the utilization efficiency of the ammonia alkali white mud is improved.
The application utilizes a plurality of solid wastes to cooperatively prepare the cementing material, improves the utilization efficiency of the solid wastes, and ensures that the utilization rate of the solid wastes can reach 100 percent, and realizes the synergistic hydration of the ammonia alkali white mud, the fly ash and the slag, thereby preparing the cementing material by the synergistic hydration of the ammonia alkali white mud, the slag and the fly ash, and having great significance for the large-scale treatment and utilization of the ammonia alkali white mud.
It should be explained that Friedel salt is a bimetallic layer columnar compound with special interlayer ion exchange properties and structural memory effects. The catalyst can be used as a catalyst, an adsorbent and a chelating agent for removing and stabilizing heavy metals in water. The Friedel salt can remove heavy metals by adopting methods of precipitation, flocculation, adsorption, ion exchange and the like, and the removal rate can reach more than 99 percent. The method is a simple, practical, low-cost and efficient natural mineral and synthetic adsorption material with good environmental compatibility.
The application provides a full solid waste cementing material and a preparation method thereof, which only need to dry, grind and select powder for raw materials, do not need chemical agents and high-temperature calcination, and simultaneously have higher mixing amount of ammonia alkali white mud, thereby improving the utilization way of the ammonia alkali white mud, and being extremely low in cost and environment-friendly.
Drawings
FIG. 1 is a schematic flow chart of a method for preparing a cementing material by taking alkali-ammonia white mud-slag-fly ash as a raw material, which is provided by the embodiment of the application;
FIG. 2 is a schematic diagram of the phase composition of the white mud according to the present application;
FIG. 3 is a schematic diagram showing the phase composition of the salty mud of the present application;
FIG. 4 is a schematic diagram showing the phase composition of the alkali sand in the present application;
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Example 1
The cementing material taking the alkali-ammonia white mud-slag-fly ash as the raw material comprises the following components in percentage by mass: 70% of slag, 5% of fly ash and 25% of ammonia alkali white mud. Wherein, the ammonia alkali white mud comprises the following components in percentage by mass: 20% of white mud, 0% of salt mud and 5% of alkali sand.
Example two
The cementing material taking the ammonia alkali white mud-slag-fly ash as the raw material comprises the following components in percentage by mass: 60% of slag, 10% of fly ash and 30% of ammonia alkali white mud. In the ammonia alkali white mud, the white mud is 5%, the salt mud is 15% and the alkali sand is 10%.
Example III
The cementing material taking the ammonia alkali white mud-slag-fly ash as the raw material comprises the following components in percentage by mass: 50% of slag, 15% of fly ash and 35% of ammonia alkali white mud. In the ammonia alkali white mud, the white mud is 10%, the salt mud is 10% and the alkali sand is 15%.
Example IV
The cementing material taking the ammonia alkali white mud-slag-fly ash as the raw material comprises the following components in percentage by mass: 60% of slag, 10% of fly ash and 30% of ammonia alkali white mud. In the ammonia alkali white mud, 10% of salt mud and 10% of alkali sand.
The main chemical compositions of the white mud, the salt mud and the alkali sand are shown in the following table 1
TABLE 1 chemical compositions of white mud, salt mud and alkali sand (%)
The main phase compositions of the white mud, the salt mud and the alkali sand are shown in fig. 2, 3 and 4.
The main components of the white mud are 10% -20% of chloride salt (mainly NaCl), 20% -35% of calcite (calcium carbonate mineral) and 30% -40% of gypsum (CaSO) 4 ·2H 2 O); the main component of the salt mud is gypsum 60% -80% (CaSO) 4 ·2H 2 O) brucite 5% -10% (Mg (OH) 2 ) And 1% -3% of chloride; the main component of the alkali sand is 30% -40% (Ca (OH)) of the calcite 2 ) 40% -60% of calcite and 1% -2% of chloride.
Based on the same inventive concept, the embodiment of the application also provides a preparation method of the cementing material using the alkali-ammonia white mud-slag-fly ash as a raw material, as shown in fig. 1, wherein the method comprises the following steps:
firstly, as the fineness of the ammonia alkali white mud is finer and the water retention rate is better, firstly, respectively press-filtering the white mud or the salt mud until the water content is less than 50%, then scattering and airing to reduce the water content of the white mud or the salt mud entering a drying process, reduce the drying cost, and then drying the white mud or the salt mud until the water content is less than 1% under the action of hot air at 300 ℃; the crystallization water in the white mud or the salt mud can be removed at the temperature of 300 ℃, so that the condition of blocking grinding in the subsequent ball milling and grinding process is avoided;
in the first step, white mud or salt mud is respectively pressed and filtered by a press filter, scattered by a scattering machine, aired and then sent into a rotary dryer for drying.
Step two, drying the alkali sand by a dryer until the water content is less than 1%, and then feeding the alkali sand into a roller press for grinding; the ground alkali sand material is subjected to powder selection to obtain alkali sand particles larger than 1mm and alkali sand particles smaller than 1 mm; the step is to pre-grind the alkali sand particles, and because the alkali sand particles are thicker, the alkali sand particles are pre-ground, the particle size of the alkali sand particles entering the ball mill is reduced, and the grinding efficiency of the ball mill is improved;
and step two, the alkali sand is dried by a rotary dryer, and the powder concentrator is a V-shaped powder concentrator, belongs to static grading scattering equipment, is beneficial to improving the stable operation of the roller press, and has the advantages of simple structure and convenient adjustment.
Step three, alkali sand particles smaller than 1mm, dried salt mud and white mud are mixed in proportion and enter a first ball mill for grinding; meanwhile, the alkali sand particles larger than 1mm are sent back to the roller press for grinding and sorting again; the grindability and the material properties of the alkali sand, the salt mud and the white mud are similar, so that the three materials are mixed and ground to prepare the ammonia alkali white mud powder, which is beneficial to reducing the grinding cost and is convenient for adjusting the mixing amount of the cementing material in the subsequent production.
Step four, entering a first ballThe salt mud and white mud mixed material after grinding by the mill are separated by a powder separator, and the obtained mixed material with the specific surface area of more than 500 square meters per kg is ammonia alkali white mud powder with the specific surface area of more than 500m 2 The/kg is beneficial to the exertion of the activity; returning the mixed material with the specific surface area smaller than 500 square meters per kg to the first ball mill for grinding again;
in the fourth step, the salt slurry and white slurry mixture ground by the first ball mill enter an O-type powder selecting machine for selecting powder, and meanwhile, the O-type powder selecting machine is matched with a cloth bag dust remover for dust removal.
Fifthly, feeding slag raw materials into a vertical mill for grinding through a vibration feeder, drying under the action of a hot blast stove in the grinding process, and then sorting through a powder sorting machine to obtain slag powder with specific surface area of more than 500 square meters per kg and specific surface area of more than 500m 2 The/kg is beneficial to the exertion of the activity; slag with specific surface area less than 500 square meters per kg is returned to be ground again and separated;
in the fifth step, the slag raw material is sent into a vertical mill for grinding through a vibration feeder, dried through a hot blast furnace and then is subjected to powder selection through an O-type powder selector. And in the fourth step and the fifth step, the O-shaped powder concentrator is adopted, and the O-shaped powder concentrator adopts a totally-enclosed structure, so that dust emission can be effectively avoided, and meanwhile, the powder concentrator is efficient and accurate, and is suitable for fine particle separation.
Step six, mixing the ammonia alkali white mud powder, the slag powder and the fly ash in proportion, feeding the mixture into a second ball mill for grinding, and sorting to obtain the final ammonia alkali white mud powder-based cementing material, wherein the high stability of the chemical property and the grain size grading of the cementing material can be realized in the mixing grinding process, so that the quality of the product is more stable, and meanwhile, the strength of the product can be improved;
in the sixth step, the water content of the ammonia alkali white mud powder-based cementing material is less than 1%, the specific surface area is more than 500 square meters per kg, and the strength of the cementing material is facilitated to be exerted;
and step six, grinding the mixture fed into the second ball mill, and selecting powder by an O-type powder selecting machine.
Table 2 shows the values of the strength of the cement test blocks prepared in the examples with different proportions at different ages
The table shows that the cementing material test block prepared by the application has higher strength at different ages, can meet the strength requirement of 32.5 cement, has large comprehensive utilization amount of solid wastes under the same condition, has low production cost, and can directly replace cement for use under various conditions. The initial setting time and the final setting time are relatively long, and the working performance is good when the concrete is prepared, thereby being beneficial to long-distance transportation and pumping.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (8)
1. The preparation method of the cementing material using the alkali-ammonia white mud-slag-fly ash as the raw material is characterized by comprising the following steps:
step one, respectively press-filtering white mud or salt mud until the water content is less than 50%, scattering and airing, and drying the white mud or salt mud until the water content is less than 1% under the action of hot air at 300 ℃ by a dryer;
step two, the alkali sand is dried by a dryer until the water content is less than 1%, and then is sent into a roller press for grinding; the ground alkali sand material is subjected to powder selection by a powder selector to obtain alkali sand particles larger than 1mm and alkali sand particles smaller than 1 mm;
step three, alkali sand particles smaller than 1mm, dried salt mud and white mud are mixed in proportion and enter a first ball mill for grinding; meanwhile, the alkali sand particles larger than 1mm are sent back to the roller press for grinding and sorting again;
step four, the salt mud and white mud mixed materials which enter a first ball mill for grinding are separated by a powder separator, and the obtained mixed materials with the specific surface area of more than 500 square meters per kg are ammonia alkali white mud powder; returning the mixed material with the specific surface area smaller than 500 square meters per kg to the first ball mill for grinding again;
feeding the slag raw material into a vertical mill for grinding through a vibration feeder, drying under the action of a hot blast stove in the grinding process, and then sorting through a powder sorting machine to obtain slag powder with the specific surface area of more than 500 square meters per kg; returning slag powder with the specific surface area less than 500 square meters per kg to a vertical mill for re-grinding and sorting;
step six, mixing the ammonia alkali white mud powder, the slag powder and the fly ash in proportion, feeding the mixture into a second ball mill for grinding, and sorting the mixture to obtain a final ammonia alkali white mud-based cementing material;
the raw materials comprise the following components in percentage by mass: 50-70% of slag, 5-25% of fly ash and 20-50% of alkali-ammonia white mud;
the ammonia alkali white mud comprises one or more of white mud, salt mud and alkali sand; the slag is water quenched and granulated blast furnace slag generated in the blast furnace steelmaking process; the fly ash is powder collected in flue gas of a pulverized coal furnace of a power plant.
2. The method for preparing the cementing material using the alkali-slag-fly ash as a raw material according to claim 1, wherein in the sixth step, the water content of the alkali-slag-fly ash-based cementing material is less than 1%, and the specific surface area is more than 500 square meters/kg.
3. The method for preparing the cementing material by taking the alkali-ammonia white mud, slag and fly ash as raw materials according to claim 1, wherein in the first step, the white mud or the salt mud is respectively subjected to filter pressing by a filter press, scattered by a scattering machine, and then is dried by a rotary dryer.
4. The method for preparing the cementing material by taking the alkali-ammonia white mud-slag-fly ash as a raw material according to claim 1, wherein in the second step, alkali sand is dried by a rotary dryer, and powder is selected by a V-shaped powder selecting machine after grinding.
5. The method for preparing the cementing material using the alkali-slag-fly ash as the raw material according to claim 1, wherein in the fourth step, the salt slurry and the white slurry mixed material ground by the first ball mill enter an O-type powder selecting machine for powder selecting.
6. The method for preparing the cementing material by taking the alkali-ammonia white mud, slag and fly ash as raw materials according to claim 1, wherein in the fifth step, the slag raw material is sent into a vertical mill for grinding through a vibration feeder, dried through a hot blast stove and then is selected by an O-type powder selecting machine.
7. The method for preparing the cementing material by taking the alkali-slag-fly ash as a raw material according to claim 1, wherein the main components of the lime mud are 10% -20% of chloride, 20% -35% of calcite and 30% -40% of gypsum; the main components of the salt slurry are 60% -80% of gypsum, 5% -10% of brucite and 1% -3% of chloride; the main components of the alkali sand are 30% -40% of hydroxycalcite, 40% -60% of calcite and 1% -2% of chloride.
8. The method for preparing the cementing material using the alkali-slag-fly ash as a raw material according to claim 7, wherein the main chemical composition of the lime mud is as follows: 30% -50% of CaO, 5% -15% of MgO and Al 2 O 3 0~5%、SiO 2 5%~15%、Na 2 O 0~3%、SO 3 6%~12%、K 2 O 0~1%、Fe 2 O 3 0~2%、Cl 10%~13%；
The main chemical composition of the salt mud is as follows: 20% -35% of CaO, 15% -30% of MgO and Al 2 O 3 0~5%、SiO 2 0%~5%、Na 2 O 0~4%、SO 3 20%~35%、K 2 O 0~1%、Fe 2 O 3 0~2%、Cl 0%~3%；
The alkali sand mainly comprises the following chemical components: 50% -70% of CaO, 3% -8% of MgO and Al 2 O 3 2~8%、SiO 2 5%~15%、Na 2 O 0~3%、SO 3 0%~3%、K 2 O 0~1%、Fe 2 O 3 0~2%、Cl 4%~6%。
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