CN114685132B - Water-resistant original-state phosphogypsum-magnesium-rich slag cementing material - Google Patents
Water-resistant original-state phosphogypsum-magnesium-rich slag cementing material Download PDFInfo
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- CN114685132B CN114685132B CN202210377947.9A CN202210377947A CN114685132B CN 114685132 B CN114685132 B CN 114685132B CN 202210377947 A CN202210377947 A CN 202210377947A CN 114685132 B CN114685132 B CN 114685132B
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- Prior art keywords
- phosphogypsum
- magnesium
- water
- rich slag
- resistant
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- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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
Abstract
The invention discloses a water-resistant original-state phosphogypsum-magnesium-rich slag cementing material, which solves the problems of accumulation of a large amount of phosphogypsum, secondary environmental pollution prevention, low gelling activity of original-state phosphogypsum, limited recycling range of phosphogypsum in the field of buildings and poor water resistance of phosphogypsum mortar. Provides a path with higher added value for processing a large amount of phosphogypsum, and can also partially replace cement to be applied in the construction industry. The invention relates to a water-resistant undisturbed phosphogypsum-magnesium-rich slag cementing material, which consists of the following components in percentage by mass: 10-20% of undisturbed phosphogypsum, 10-20% of waterproof reinforcing material and 70-80% of magnesium-rich slag.
Description
Technical Field
The invention relates to a cementing material, in particular to a water-resistant undisturbed phosphogypsum-magnesium-rich slag cementing material, and belongs to the technical field of waste resource utilization.
Background
The undisturbed phosphogypsum is a byproduct (solid waste residue generated when phosphorite is treated by sulfuric acid in the production process of phosphoric acid) for producing phosphate fertilizer, and the main component of the undisturbed phosphogypsum is calcium sulfate dihydrate, and contains impurities, radioactive substances and the like which are harmful to the environment, such as residual phosphoric acid, various phosphates, sulfate radicals, fluorides, organic substances and the like.
On one hand, harmful substances contained in the phosphogypsum can migrate in environment accumulation even a food chain through improper treatment and use, and if no effective measures are taken, a new threat can be brought to the environment; on the other hand, large-scale and industrial utilization of phosphogypsum can generate a large amount of waste gas, waste water and secondary solid waste in the production and use processes, and can cause new environmental pollution if the treatment is improper. Therefore, the phosphogypsum is developed and utilized in protection, the problem of secondary environmental pollution is prevented while the problem of a large amount of accumulated phosphogypsum is solved, and the sustainable development of the phosphogypsum utilization industry can be realized only in this way.
Disclosure of Invention
The invention aims to provide a water-resistant original-state phosphogypsum-magnesium-rich slag cementing material, which solves the problems of accumulation of a large amount of phosphogypsum and secondary environmental pollution prevention, and solves the problems of low gelling activity of original-state phosphogypsum, limited recycling range of phosphogypsum in the field of buildings and poor water resistance of phosphogypsum mortar. Provides a path with higher added value for processing a large amount of phosphogypsum, and can also partially replace cement to be applied in the building industry.
The invention is realized by the following technical scheme:
the invention relates to a water-resistant undisturbed phosphogypsum-magnesium-rich slag cementing material, which consists of the following components in percentage by mass:
10 to 20 percent of undisturbed phosphogypsum
10 to 20 percent of water-resistant reinforcing material
70-80% of magnesium-rich slag.
The invention further adopts the technical scheme that the water-resistant undisturbed phosphogypsum-magnesium-rich slag cementing material is special waste slag discharged in the metal smelting process, the fineness modulus is 2.5-2.8, the mud content is not more than 1.5%, and the magnesium-rich slag comprises the following components in percentage by mass:
wherein: LOI denotes loss on ignition.
The water-resistant undisturbed phosphogypsum-magnesium-rich slag cementing material further adopts the technical scheme that the phosphogypsum comprises the following components in percentage by mass:
wherein: r 2 O represents an alkali metal oxide, and LOI represents a loss on ignition.
The water-resistant undisturbed phosphogypsum-magnesium-rich slag cementing material further adopts the technical scheme that the water-resistant reinforcing material comprises the following components in percentage by mass:
wherein: r 2 O represents an alkali metal oxide.
The invention has the following beneficial effects:
the original-state phosphogypsum is used as a main raw material to prepare a water-resistant original-state phosphogypsum-magnesium-rich slag cementing material, a water-resistant reinforcing material is mixed into the water-resistant raw material to prepare a test block through proper mixing proportion, and the water-resistant reinforcing material and each component in the phosphogypsum undergo hydration reaction to generate calcium silicate hydrate, so that the cementing effect is achieved, and the early strength is formed. The magnesium-rich slag is used as granular crystals and plays roles of a framework and filling. The addition of the magnesium-rich slag reduces the cost and improves the water resistance. Along with the continuous generation of alkaline hydration products, the alkaline hydration products excite the magnesium-rich slag, so that weak chemical reaction occurs on the particle surface, the particles are in closer contact with the cementing material, the internal structure of the hardened body is denser, and the later-stage compressive strength of the hardened body is improved.
The water-resistant undisturbed phosphogypsum-magnesium-rich slag cementing material provided by the invention has high strength and good water resistance, and waste resources such as phosphogypsum, magnesium-rich slag and the like are recycled. The cost is low, the material belongs to an environment-friendly material, and the carbon emission is favorably reduced.
Drawings
Figure 1 is an X-ray diffraction (XRD) pattern of phosphogypsum;
figure 2 is a scanning electron micrograph of an phosphogypsum-based gelling material;
Detailed Description
The magnesium-rich slag used in the embodiment is special waste slag discharged in a metal smelting process, the fineness modulus is 2.5-2.8, the mud content is not more than 1.5%, and the magnesium-rich slag comprises the following components in percentage by mass:
wherein: LOI denotes loss on ignition.
The mass percentages of the components of the phosphogypsum used in the examples are as follows:
wherein: r is 2 O represents an alkali metal oxide, and LOI represents a loss on ignition.
The water-resistant reinforcing material used in the examples comprises the following components in percentage by mass:
wherein: r 2 O represents an alkali metal oxide.
Example 1
The original phosphogypsum is used as a main raw material, and a water-resistant reinforcing material is doped to prepare the phosphogypsum-based cementing material. Weighing the following raw materials in percentage by mass: 10% of phosphogypsum and 15% of waterproof reinforcing material, and adding a certain amount of water into a cement paste stirring pot for stirring, wherein after stirring, the paste preparation is finished. Curing the mixture for 3, 7, 28 and 90 days under the conditions of (20 +/-2) DEG C (humidity is more than 90%), respectively testing the compressive strength, and the test results are shown in a table 1.
On the basis, magnesium-rich slag is used as fine aggregate, and the raw materials are weighed to account for the total mass percent: 10% of phosphogypsum, 15% of water-resistant reinforcing material and 75% of magnesium-rich slag, and adding weighed water to prepare the phosphogypsum-based mortar material. And injecting the prepared mortar slurry into a 40mm multiplied by 160mm triple-link mold, curing for 24 hours under standard curing conditions, then demolding, curing the sample for 7, 28 and 90 days under the same conditions, and carrying out various performance test results shown in table 2.
Example 2
The original phosphogypsum is used as a main raw material, and a water-resistant reinforcing material is doped to prepare the phosphogypsum-based cementing material. Weighing the following raw materials in percentage by mass: 12.5% of phosphogypsum and 12.5% of waterproof reinforcing material, and adding a certain amount of water into a cement paste stirring pot for stirring, wherein after stirring, the preparation of the paste is finished. Curing at 20 +/-2 deg.C (humidity greater than 90%) for 3, 7, 28 and 90 days, and respectively testing the compressive strength, and the test results are shown in Table 1.
On the basis, the magnesium-rich slag is used as fine aggregate, and the raw materials are weighed to account for the following total mass percent: 12.5 percent of phosphogypsum, 12.5 percent of water-resistant reinforcing material and 75 percent of magnesium-rich slag, and adding weighed water to prepare the phosphogypsum-based mortar material. And injecting the prepared mortar slurry into a 40mm multiplied by 160mm triple die, curing for 24 hours under standard curing conditions, then demolding, curing the sample for 7, 28 and 90 days under the same conditions, and carrying out various performance test results shown in table 2.
Example 3
The original phosphogypsum is used as a main raw material, and a water-resistant reinforcing material is doped to prepare the phosphogypsum-based cementing material. Weighing the following raw materials in percentage by mass: 15% of phosphogypsum and 10% of waterproof reinforcing material, and adding a certain amount of water into a cement paste stirring pot for stirring, and finishing the preparation of the paste after the stirring is finished. Curing the mixture for 3, 7, 28 and 90 days under the conditions of (20 +/-2) DEG C (humidity is more than 90%), respectively testing the compressive strength, and the test results are shown in a table 1.
On the basis, magnesium-rich slag is used as fine aggregate, and the raw materials are weighed to account for the total mass percent: 15% of phosphogypsum, 10% of waterproof reinforcing material and 75% of magnesium-rich slag, and adding weighed water to prepare the phosphogypsum-based mortar material. And injecting the prepared mortar slurry into a 40mm multiplied by 160mm triple die, curing for 24 hours under standard curing conditions, then demolding, curing the sample for 7, 28 and 90 days under the same conditions, and carrying out various performance test results shown in table 2.
Table 1: results of Performance testing of samples of cementitious Material in the examples
Table 2: results of Performance testing of samples of cementitious Material in the examples
Claims (1)
1. The water-resistant undisturbed phosphogypsum-magnesium-rich slag cementing material is characterized by comprising the following components in percentage by mass:
10 to 20 percent of undisturbed phosphogypsum
10 to 20 percent of water-resistant reinforcing material
70-80% of magnesium-rich slag;
the magnesium-rich slag is special waste slag discharged in the metal smelting process, the fineness modulus is 2.5-2.8, the mud content is not more than 1.5%, and the magnesium-rich slag comprises the following components in percentage by mass:
the phosphogypsum comprises the following components in percentage by mass:
the water-resistant reinforced material comprises the following components in percentage by mass:
wherein: r is 2 O represents an alkali metal oxide, and LOI represents an ignition loss.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210377947.9A CN114685132B (en) | 2022-04-12 | 2022-04-12 | Water-resistant original-state phosphogypsum-magnesium-rich slag cementing material |
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|---|---|---|---|
| CN202210377947.9A CN114685132B (en) | 2022-04-12 | 2022-04-12 | Water-resistant original-state phosphogypsum-magnesium-rich slag cementing material |
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| CN114685132A CN114685132A (en) | 2022-07-01 |
| CN114685132B true CN114685132B (en) | 2022-12-27 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101830679A (en) * | 2009-03-13 | 2010-09-15 | 上海晋马建材有限公司 | Roasting-free desulfurized gypsum, phosphorous gypsum, preparation of high-intensity, waterproof composite cementitious material |
| KR100992888B1 (en) * | 2010-04-16 | 2010-11-09 | (주)유성테크 | Environmental fire resistant spray coating composition |
| CN108298839A (en) * | 2018-01-11 | 2018-07-20 | 中国恩菲工程技术有限公司 | Cement cementitious material and its method for preparing cement cementitious material using flying dust |
| CN114276097A (en) * | 2022-01-12 | 2022-04-05 | 上海理工大学 | Nickel slag cementing material for improving activity of nickel slag through split-phase activation and preparation method thereof |
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- 2022-04-12 CN CN202210377947.9A patent/CN114685132B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101830679A (en) * | 2009-03-13 | 2010-09-15 | 上海晋马建材有限公司 | Roasting-free desulfurized gypsum, phosphorous gypsum, preparation of high-intensity, waterproof composite cementitious material |
| KR100992888B1 (en) * | 2010-04-16 | 2010-11-09 | (주)유성테크 | Environmental fire resistant spray coating composition |
| CN108298839A (en) * | 2018-01-11 | 2018-07-20 | 中国恩菲工程技术有限公司 | Cement cementitious material and its method for preparing cement cementitious material using flying dust |
| CN114276097A (en) * | 2022-01-12 | 2022-04-05 | 上海理工大学 | Nickel slag cementing material for improving activity of nickel slag through split-phase activation and preparation method thereof |
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