CN118221364A - Method for preparing high-activity auxiliary cementing material by calcium-increasing thermal activation of sand washing mud - Google Patents
Method for preparing high-activity auxiliary cementing material by calcium-increasing thermal activation of sand washing mud Download PDFInfo
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- CN118221364A CN118221364A CN202410475964.5A CN202410475964A CN118221364A CN 118221364 A CN118221364 A CN 118221364A CN 202410475964 A CN202410475964 A CN 202410475964A CN 118221364 A CN118221364 A CN 118221364A
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- China
- Prior art keywords
- sand washing
- washing mud
- calcium
- cementing material
- auxiliary cementing
- Prior art date
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- 239000000463 material Substances 0.000 title claims abstract description 56
- 239000004576 sand Substances 0.000 title claims abstract description 50
- 238000005406 washing Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000000694 effects Effects 0.000 title claims abstract description 17
- 238000007725 thermal activation Methods 0.000 title description 8
- 239000000203 mixture Substances 0.000 claims abstract description 17
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 13
- 238000001354 calcination Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 8
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 5
- 239000001110 calcium chloride Substances 0.000 claims description 5
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 235000019738 Limestone Nutrition 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 3
- 239000010459 dolomite Substances 0.000 claims description 3
- 229910000514 dolomite Inorganic materials 0.000 claims description 3
- 239000010440 gypsum Substances 0.000 claims description 3
- 229910052602 gypsum Inorganic materials 0.000 claims description 3
- 239000006028 limestone Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000000227 grinding Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000002910 solid waste Substances 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 43
- 239000011499 joint compound Substances 0.000 description 35
- 239000004568 cement Substances 0.000 description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 239000004567 concrete Substances 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
- 239000004566 building material Substances 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- 235000012255 calcium oxide Nutrition 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052604 silicate mineral Inorganic materials 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000000654 additive 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
- 239000002734 clay mineral Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 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
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
-
- 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
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for preparing a high-activity auxiliary cementing material by calcium-increasing and thermal-activating sand washing mud, and belongs to the technical field of comprehensive utilization of solid wastes. The method comprises the following steps: and uniformly mixing the dried sand washing mud, calcium carbonate and mineralizer, putting the mixture into a high-temperature furnace, and cooling the calcined powder to room temperature to obtain the auxiliary cementing material. The activity of the auxiliary cementing material prepared by calcium-increasing and heat-activating the sand washing mud is as high as more than 90%; and the powder after calcination does not need grinding, and the process is simple. The invention not only can utilize the sand washing mud in a high-valued way, but also can reduce the energy consumption and pollution of production, and has important economic and environmental benefits.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of building materials and solid wastes, and particularly relates to a method for preparing a high-activity auxiliary cementing material by calcium-increasing thermal activation of sand washing mud.
Background
The machine-made sand inevitably generates powder particles (stone powder and mud powder) in the production process, and has negative influence on the quality of concrete prepared by the machine-made sand. In order to obtain high-quality machine-made sand, stone powder and mud powder in the sand need to be removed by adopting a water washing mode in the preparation process. It is counted that every time 1m 3 of machine-made sand is washed with water, 4m 3 of water is needed, the produced sand washing mud is large in quantity and difficult to dispose, and serious pollution is generated to the environment whether the sand washing mud is directly discharged or piled up for landfill. Therefore, the search for an effective method for safe management and resource utilization of sand washing mud is a current urgent problem to be solved.
With the deep advancement of the national major development strategies such as traffic country and city updating, the demand of cement concrete is huge, so that the phenomenon of supply shortage of traditional auxiliary cementing materials such as fly ash, slag, silica fume and the like occurs, and even the situation that no auxiliary cementing material is available in partial areas occurs. Therefore, a huge amount of auxiliary cementing material markets provide a new idea for the high-value utilization of the sand washing mud. In the building materials, the auxiliary cementing material can be used as a cement mixture for preparing cement and can also be used as a concrete admixture for preparing concrete. The invention patent CN112960919A discloses a method for preparing a cement mixed material by using sand washing sludge, which comprises the steps of mixing 5-15% of quicklime with the sand washing sludge, adding 0.05-0.1% of grinding aid and 2-5% of exciting agent into the mixed material, calcining at 700-900 ℃, and grinding until the calcined materials pass through a 45 mu m sieve to prepare the cement mixed material. The activity of the sand washing mud cement mixture prepared by the method is not higher than 76%, and additives such as grinding aid, exciting agent and the like are required to be added during calcination, and grinding is required after calcination, so that the industrial production cost and difficulty are increased.
Disclosure of Invention
The invention provides a method for preparing a high-activity auxiliary cementing material by calcium-increasing thermal activation of sand washing mud in order to overcome the defects of the prior art. The activity of the auxiliary cementing material is more than 90%, and grinding is not needed after calcination, so that the production energy consumption is greatly reduced.
The invention relates to a method for preparing a high-activity auxiliary cementing material by calcium-increasing and thermal activation of sand washing mud, which comprises the following steps:
Step 1: mixing the dried sand washing mud, the calcium material and the mineralizer to obtain a mixture A;
Step 2: conveying the mixture A obtained in the step 1 into a high-temperature furnace, heating to 800-900 ℃, and preserving heat for 60-120 min to obtain a calcination product of full reaction;
step 3: and (3) cooling the calcined product obtained in the step (2) to room temperature to obtain the auxiliary cementing material.
Preferably, the grain size of the sand washing mud is less than or equal to 150 mu m, and the grain size of the calcareous material is less than or equal to 75 mu m.
Preferably, the calcareous material is selected from one of limestone powder, dolomite powder and calcium carbonate.
Preferably, the mineralizer is selected from one of calcium fluoride, calcium chloride and gypsum.
Further, the mass percentages of the calcareous material and the sand washing mud are as follows: 15-30% of calcareous material, 70-85% of sand washing mud, and 100% of the sum of the calcareous material and the sand washing mud.
Further, the addition mass of the mineralizer is 1-5% of the total mass of the calcareous material and the sand washing mud.
The technical principle of the invention is as follows:
adding a calcareous material and a mineralizer into the sand washing mud, calcining at 800-900 ℃, dehydrating clay minerals in the sand washing mud, and changing a crystalline ordered structure into an amorphous structure; secondly, when the calcium carbonate is decomposed, the mineralizer which is uniformly distributed is in a molten state, so that the low-temperature decomposition of a pushing phase and the combination of calcium oxide on the surface of the sand washing mud particles accelerate the destruction of structures such as silica, alumina and the like of the mineral phase; finally, the calcium oxide reacts with the active silicon oxide and aluminum oxide in the system to generate silicate minerals, so that the reactivity is improved. In addition, as part of mineral structures of the sand washing mud expand and destroy and the components volatilize in the calcium increasing and heat activating process, the minerals are decomposed, the particle size is greatly reduced, and the activated sand washing mud does not need further grinding.
The beneficial effects of the invention are as follows:
(1) The activity index of the auxiliary cementing material obtained by the calcium-increasing thermal activation method can reach more than 90%, and the high-value utilization of the sand washing mud can be realized;
(2) The auxiliary cementing material prepared by the calcium-increasing thermal activation of the sand washing mud does not need to be ground after calcination, and can obviously reduce energy consumption.
Therefore, the invention not only can utilize the sand washing mud with high value, provides a method for preparing the high-activity auxiliary cementing material, but also simplifies the preparation process, effectively reduces the consumption of resources and energy sources and the pollution to the environment in the production of the auxiliary cementing material, and is beneficial to promoting the green sustainable development of the building material industry.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
Fig. 1 is an XRD pattern of the supplementary cementitious materials prepared in comparative examples 1 and 2 and examples 1 and 2.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to examples. It should be understood that the detailed description is intended to illustrate and explain the invention, and not to limit the invention.
Example 1:
fully mixing the dried sand washing mud, calcium carbonate and calcium chloride in a mass ratio of 85:15:3 to obtain a mixture; then placing the mixture into a high-temperature furnace, heating to 800 ℃, and preserving heat for 90min to obtain a calcined product; and cooling the calcined product to room temperature to obtain the auxiliary cementing material.
Example 2:
Fully mixing the dried sand washing mud, calcium carbonate and calcium chloride in a mass ratio of 70:30:3 to obtain a mixture; then placing the mixture into a high-temperature furnace, heating to 800 ℃, and preserving heat for 90min to obtain a calcined product; and cooling the calcined product to room temperature to obtain the auxiliary cementing material.
Example 3:
Fully mixing the dried sand washing mud, limestone powder and calcium fluoride in a mass ratio of 70:30:3 to obtain a mixture; then placing the mixture into a high-temperature furnace, heating to 900 ℃, and preserving heat for 60min to obtain a calcined product; and cooling the calcined product to room temperature to obtain the auxiliary cementing material.
Example 4:
fully mixing the dried sand washing mud, dolomite powder and calcium chloride in a mass ratio of 70:30:3 to obtain a mixture; then placing the mixture into a high-temperature furnace, heating to 900 ℃, and preserving heat for 120min to obtain a calcined product; and cooling the calcined product to room temperature to obtain the auxiliary cementing material.
Example 5:
fully mixing the dried sand washing mud, calcium carbonate and gypsum in a mass ratio of 70:30:3 to obtain a mixture; then placing the mixture into a high-temperature furnace, heating to 900 ℃, and preserving heat for 120min to obtain a calcined product; and cooling the calcined product to room temperature to obtain the auxiliary cementing material.
Comparative example 1:
different from the embodiment, a sand washing mud thermal activation preparation auxiliary cementing material is provided. Placing the dried sand washing mud into a high-temperature furnace, heating to 800 ℃, and preserving heat for 120min to obtain a calcination product; and cooling the calcined product to room temperature to obtain the auxiliary cementing material.
Comparative example 2:
Unlike the above embodiments, the dried sand washing mud is used as an auxiliary cementing material.
The supplementary cementitious materials obtained in the above examples were tested according to the standard for testing the activity index of the usual supplementary cementitious materials such as fly ash and steel slag, and the test results are shown in table 2.
Table 2 Activity index of each group of samples
As can be seen from Table 2, the activity indexes of the auxiliary cementing materials prepared in the examples 1 to 5 of the invention are all greater than 90%, which is superior to 76% of that in the patent CN112960919A of the invention, and is far greater than the qualification standard of common auxiliary cementing materials such as fly ash, steel slag and the like. In addition, the invention not only can prepare the high-activity auxiliary cementing material, but also omits the grinding process, reduces the production cost and has social benefit and environmental benefit.
As can be seen from fig. 1, the mineral phase diffraction peak intensity of the auxiliary cementing material prepared by the invention is obviously reduced, which indicates that the disordered structure of the activated sand washing mud is obviously enhanced. Meanwhile, as the calcareous material and the mineralizer are decomposed, a new active silicate mineral is generated with active SiO 2 and Al 2O3 in the sand washing mud, and the activity of the auxiliary cementing material is enhanced.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The method for preparing the high-activity auxiliary cementing material by calcium-increasing and heat-activating the sand washing mud is characterized by comprising the following steps of:
Step 1: mixing the dried sand washing mud, the calcium material and the mineralizer to obtain a mixture A;
Step 2: conveying the mixture A obtained in the step 1 into a high-temperature furnace, heating to 800-900 ℃, and preserving heat for 60-120 min to obtain a calcination product of full reaction;
step 3: and (3) cooling the calcined product obtained in the step (2) to room temperature to obtain the auxiliary cementing material.
2. The method according to claim 1, characterized in that:
the calcareous material is selected from one of limestone powder, dolomite powder and calcium carbonate.
3. The method according to claim 1, characterized in that:
The mineralizer is one of calcium fluoride, calcium chloride and gypsum.
4. A method according to claim 2 or 3, characterized in that:
The grain diameter of the sand washing mud is less than or equal to 150 mu m, and the grain diameter of the calcareous material is less than or equal to 75 mu m.
5. A method according to claim 2 or 3, characterized in that:
The mass percentages of the calcareous material and the sand washing mud are as follows: 15-30% of calcareous material, 70-85% of sand washing mud, and 100% of the sum of the calcareous material and the sand washing mud.
6. The method according to claim 5, wherein:
The added mass of the mineralizer is 1-5% of the total mass of the calcareous material and the sand washing mud.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410475964.5A CN118221364A (en) | 2024-04-19 | 2024-04-19 | Method for preparing high-activity auxiliary cementing material by calcium-increasing thermal activation of sand washing mud |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410475964.5A CN118221364A (en) | 2024-04-19 | 2024-04-19 | Method for preparing high-activity auxiliary cementing material by calcium-increasing thermal activation of sand washing mud |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118221364A true CN118221364A (en) | 2024-06-21 |
Family
ID=91503996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410475964.5A Pending CN118221364A (en) | 2024-04-19 | 2024-04-19 | Method for preparing high-activity auxiliary cementing material by calcium-increasing thermal activation of sand washing mud |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118221364A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118619579A (en) * | 2024-08-12 | 2024-09-10 | 浙江天造环保科技有限公司 | Cement-based material admixture based on machine-made sand tailing slurry and preparation method thereof |
-
2024
- 2024-04-19 CN CN202410475964.5A patent/CN118221364A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118619579A (en) * | 2024-08-12 | 2024-09-10 | 浙江天造环保科技有限公司 | Cement-based material admixture based on machine-made sand tailing slurry and preparation method thereof |
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