CN114685073B - Chalcogenide magnesium cementing material and use method and application thereof - Google Patents

Chalcogenide magnesium cementing material and use method and application thereof Download PDF

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CN114685073B
CN114685073B CN202210253434.7A CN202210253434A CN114685073B CN 114685073 B CN114685073 B CN 114685073B CN 202210253434 A CN202210253434 A CN 202210253434A CN 114685073 B CN114685073 B CN 114685073B
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magnesium
sulfur
chalcogenide
slag
oxide
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CN114685073A (en
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于浩
程寅
魏道新
沈君
杨天军
余昆
邹东博
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China Academy of Transportation Sciences
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China Academy of Transportation Sciences
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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
    • C04B9/00—Magnesium cements or similar cements
    • C04B9/04—Magnesium cements containing sulfates, nitrates, phosphates or fluorides
    • 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
    • C04B28/30—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 magnesium cements or similar cements
    • 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
    • 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
    • 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
    • C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
    • 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 present disclosure relates to a sulfur-based magnesium cementing material, a use method and an application thereof, wherein the sulfur-based magnesium cementing material comprises sulfur-containing magnesium slag, magnesium oxide and limestone powder. The cementing material provided by the disclosure takes the sulfur-containing magnesium slag as a raw material, so that the sulfur-containing magnesium slag can be recycled, the environmental problem caused by stacking and burying the sulfur-containing magnesium slag can be solved, the production cost of the cementing material and the carbon emission in the production process can be obviously reduced, and the economic benefit and the environmental benefit are obvious; and the cementing material provided by the disclosure has excellent strength and durability, and can be widely applied.

Description

Chalcogenide magnesium cementing material and use method and application thereof
Technical Field
The disclosure relates to the technical field of industrial waste residue treatment, in particular to a chalcogenide magnesium cementing material and a use method and application thereof.
Background
During the process of extracting metal magnesium by utilizing the Pidgeon reduction method, a large amount of solid waste residues can be discharged, and the solid waste residues are sulfur-containing magnesium residues. At present, most magnesium smelting enterprises adopt a Pidgeon magnesium smelting process to prepare magnesium metal, 6-9t of magnesium slag is generated when 1t of magnesium metal is produced by the process, and according to statistics, the magnesium slag generated by the current magnesium smelting enterprises every year is up to over 600 million tons. The discharge and accumulation of a large amount of magnesium slag occupy a large amount of land resources, and can influence the growth of vegetation and destroy the ecological environment. Therefore, a new way for large-scale and efficient resource utilization of magnesium slag is sought, and the method has great significance for environmental protection and sustainable development of metal magnesium industry.
Currently, researchers study that alkaline substances in magnesium slag can be used as a desulfurizer to desulfurize flue gas discharged by a coal-fired power plant so as to reduce the desulfurization cost of the coal-fired power plant, but the method still generates waste slag such as sulfur-containing magnesium slag and the like, and the yield is higher than that of magnesium slag before desulfurization, so that a new way for resource utilization is urgently needed to be found.
Compared with the most common cement-based cementing material in the field of construction, the magnesium cementing material is completely different in raw material composition, hydration reaction mechanism, hydration reaction products and the like, and belongs to two types of cementing materials with different systems. Besides the advantages of light weight, high strength, good thermal insulation performance and the like, the magnesium cementing material also has the advantages of simple preparation process, low carbon emission and the like compared with a cement-based cementing material. CN101323519A discloses a magnesium slag composite silicate hydraulic cementing material, which is prepared by mixing and grinding 41-55 parts of magnesium-smelting reducing slag, 15-33 parts of silicate cement clinker, 1-8 parts of gypsum, 5-20 parts of fly ash, coal slag or one or more of granulated blast furnace slag. Although magnesium slag is utilized, a large amount of materials such as portland cement and gypsum still need to be added into the cementing material, the utilization rate of the magnesium slag is not high, and the carbon emission reduction effect is limited; and the technical proposal can not lead the magnesium slag to be further used as a desulfurizer.
At present, the research and application of the sulfur-containing magnesium slag are less, and therefore, a new application direction of the sulfur-containing magnesium slag is required to be provided.
Disclosure of Invention
In order to solve the technical problems, the present disclosure provides a chalcogenide magnesium cementing material, and a use method and an application thereof.
In a first aspect, the present disclosure provides a sulfur-based magnesium cementing material, which comprises sulfur-containing magnesium slag, magnesium oxide and limestone powder.
The sulfur-based magnesium cement disclosed by the disclosure means that the main composition raw material of the cement contains magnesium sulfite (MgSO) 3 ) And/or magnesium sulfate (MgSO) 4 ) Namely, the sulfur-containing magnesium slag is taken as one of main components of the cementing material.
The cementing material provided by the disclosure is mixed with water during application, and at the moment, 5Mg (OH) is formed among the sulfur-containing magnesium slag, the magnesium oxide and the limestone powder after a series of physical and chemical reactions 2 ·Mg(SO 4 )·5H 2 O (515 facies), 5Mg (OH) 2 ·Mg(SO 4 )·7H 2 O (517 phase) is a hardened body composed of a main hydrate, and gelation is achieved. The cementing material provided by the disclosure takes sulfur-containing magnesium slag as a raw material, and not only can enable the sulfur-containing magnesium slag to beThe sulfur-containing magnesium slag can be recycled, the production cost of the cementing material and the carbon emission in the production process can be obviously reduced, and the economic benefit and the environmental benefit are obvious.
Meanwhile, the sulfur-containing magnesium slag used in the present disclosure refers to: the magnesium slag generated by magnesium smelting enterprises is used as a desulfurizer to treat sulfur-containing magnesium slag generated by flue gas discharged from coal-fired power plants. The sulfur-containing magnesium slag used in the method can be used as a desulfurizer to reduce the desulfurization cost of the coal-fired power plant, and can also be used as a raw material to prepare a cementing material from the sulfur-containing magnesium slag obtained by the desulfurization process of the coal-fired power plant, so that the cost of the cementing material can be reduced, and the resource utilization of the sulfur-containing magnesium slag can be realized.
As a preferable technical scheme of the present disclosure, the mass ratio of the sulfur-containing magnesium slag to the magnesium oxide is (1.0-2.0): 1, for example, 1.2.
In the present disclosure, the sulfur-containing magnesium slag and the magnesium oxide together complete the hydration reaction, and therefore, the ratio of the sulfur-containing magnesium slag and the magnesium oxide needs to be within the limits of the present disclosure, and if the content of the magnesium oxide is higher, the cement strength and durability will be reduced; too high a content of sulfur-containing magnesium slag also leads to a reduction in the strength and durability of the cement.
As a preferred technical scheme of the present disclosure, based on the total mass of the sulfur-based magnesium cementing material being 100%, the content of the sulfur-containing magnesium slag is 48-68%, such as 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66% and the like, the content of magnesium oxide is 25-45%, such as 26%, 28%, 30%, 32%, 35%, 38%, 40%, 42% and the like, and the content of limestone powder is 2-5%, such as 2.5%, 3%, 3.5%, 4%, 4.5% and the like.
In the method, the sulfur-containing magnesium slag and the magnesium oxide jointly complete hydration reaction, and meanwhile, the addition of the limestone powder can enable hydration products in the cementing material to exist stably for a long time, so that the strength stability of the cementing material can be ensured.
As a preferred technical scheme of the present disclosure, the content of the sulfur-containing magnesium slag is 55-68%, the content of the magnesium oxide is 25-35%, the content of the limestone powder is 2-5%, and the content of the limestone powder is more preferably 2-3%.
As a preferred technical solution of the present disclosure, the composition further includes aluminate.
As a preferred embodiment of the present disclosure, the content of the aluminate is 1 to 5%, for example, 2%, 2.2%, 2.4%, 2.5%, 2.6%, 2.8%, 3.5%, 4%, 4.5%, and the like, and more preferably 2 to 3%, based on 100% by mass of the total of the chalcogenide magnesium-based gel material.
The addition of aluminate can enhance the water stability of the cement, and if the addition amount of aluminate is low, the water stability of the cement may be poor, and if the addition amount is too high, the basic strength of the cement may be affected.
As a preferred embodiment of the present disclosure, the composition further includes sodium silicate.
As a preferable embodiment of the present disclosure, the content of the sodium water glass is 1 to 3%, for example, 1.2%, 1.4%, 1.5%, 1.6%, 1.8%, 2%, 2.5%, etc., more preferably 1 to 2%, based on 100% by mass of the total of the chalcogenide magnesium cement.
In the disclosure, the sodium water glass is added to act as an activator to activate some components (e.g. silica, calcium oxide, and alumina) in the sulfur-containing magnesium slag, promote hydration reaction of some substances and reaction with other substances (e.g. silica fume), and increase the strength of the cement, and the sodium water glass is added to increase the water stability of the cement, and the basic strength of the cement may be affected by too high or too low amount of the sodium water glass.
As a preferred technical solution of the present disclosure, the composition further includes silica fume.
In a preferred embodiment of the present disclosure, the content of the silica fume is 0.01 to 2%, for example, 0.1%, 0.5%, 1%, 1.2%, 1.4%, 1.6%, 1.8%, and more preferably 1 to 2%, based on 100% by mass of the total of the chalcogenide magnesium-based gel material.
The silica fume added into the cementing material provided by the disclosure can react with partial components (such as calcium oxide and aluminum oxide) in the sulfur-containing magnesium slag to enhance the strength of the cementing material on one hand, and can enhance the compactness of the cementing material on the other hand, so that the strength and the water stability of the cementing material can be enhanced; if the silica fume is added in an amount too high, the base strength of the cement may be affected.
As a preferred technical scheme of the present disclosure, the composition of the sulfur-containing magnesium slag comprises magnesium sulfite (MgSO) 3 ) And/or magnesium sulfate (MgSO) 4 ) Preferably, it further comprises silicon dioxide (SiO) 2 ) Calcium oxide (CaO), iron oxide (Fe) 2 O 3 ) And alumina (Al) 2 O 3 )。
As a preferred technical solution of the present disclosure, the magnesium oxide is selected from any one or more of light-burned magnesium oxide, light magnesium oxide, or active magnesium oxide, and preferably light-burned magnesium oxide.
As a preferred technical scheme of the present disclosure, the aluminate is selected from mono-Calcium Aluminate (CA) and di-Calcium Aluminate (CA) 2 ) Tricalcium aluminate (C) 3 A) Or dodecacalcium heptaluminate (C) 12 A 7 ) Preferably monocalcium aluminate and/or calcium dialuminate.
As a preferred embodiment of the present disclosure, the sodium water glass has a modulus of 1.5 to 2.5, e.g., 1.6, 1.8, 2.0, 2.2, etc., preferably 1.5 to 2.0.
In order to avoid hydration reaction of the cementing material provided by the disclosure in the processes of transportation, storage and the like, as a preferred technical scheme of the disclosure, the chalcogenide magnesium cementing material is a two-component cementing material, the component A is a combination of sulfur-containing magnesium slag, magnesium oxide, limestone powder, optionally silica fume and optionally aluminate, and the component B is sodium silicate.
As a specific embodiment of the present disclosure, the sulfur-based magnesium cementing material comprises, by taking the total mass of the components as 100%, 48-68% of sulfur-containing magnesium slag, 25-45% of magnesium oxide, 2-5% of limestone powder, 1-5% of aluminate, 1-3% of sodium silicate and 0.01-2% of silica fume.
If the cementitious material is applied directly without the need for sealing, transportation, storage, etc., the following application steps can be employed:
(1) Mixing sulfur-containing magnesium slag with water, and then adding sodium silicate;
(2) Mixing magnesium oxide, limestone powder, aluminate and silica fume, then mixing with the mixture obtained in the step (1), and then molding and curing.
If the cementing material disclosed by the disclosure needs to be transported, stored and the like, because sodium silicate contains a certain amount of water, if the components are directly mixed, stored, transported and the like, the components such as sulfur-containing magnesium slag and the like undergo hydration reaction in the process to generate a hardened body, the cementing material needs to be prepared into a two-component cementing material, and the sodium silicate is stored as a single component; when the method is carried out, the components except the sodium silicate are mixed with water, and then the sodium silicate is added and mixed for application.
Before application, the components except sodium silicate are ground separately or after mixing to make the specific surface area of each component be equal to or more than 300m independently 2 /kg, preferably 350 to 500m 2 /kg。
In a second aspect, the present disclosure provides a method for using the chalcogenide magnesium cement of the first aspect, the method comprising:
(1) Mixing the sulfur-containing magnesium slag with water, and then adding sodium silicate optionally;
(2) Mixing magnesium oxide, limestone powder, optional aluminate and optional silica fume, then mixing with the mixture of the step (1), and then forming and curing.
In the present disclosure, the amount of water added is confirmed by "water-cement ratio".
In a third aspect, the present disclosure provides a use of the chalcogenide magnesium cementing material of the first aspect in preparing magnesium concrete.
In a fourth aspect, the present disclosure provides an application of the chalcogenide magnesium cementing material of the first aspect in industrial buildings, civil buildings and road, bridge and building structures.
The cementing material provided by the disclosure has the advantages of light weight, high strength, strong water stability, good durability and the like, and is simple in preparation process and low in carbon emission, so that the cementing material can replace part of cement-based cementing materials, can be mixed with coarse and fine aggregates and other components to prepare magnesium concrete and the like, is applied to various aspects of industry, civilian use, roads, bridges and the like, and has remarkable economic benefits and environmental benefits.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
(1) The cementing material provided by the disclosure takes the sulfur-containing magnesium slag as a raw material, so that the sulfur-containing magnesium slag can be recycled, the environmental problem caused by stockpiling and burying the sulfur-containing magnesium slag can be solved, the production cost of the cementing material and the carbon emission in the production process can be remarkably reduced, and the cementing material has remarkable economic benefit and environmental benefit;
(2) The gelled material provided by the disclosure has excellent strength, water stability and durability, and can be widely applied.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
The following examples and comparative examples relate to some of the raw material sources as follows:
sulfur-containing magnesium slag: taiyuan first thermal power plant, mgSO 4 4 And MgSO 2 3 The total content of (a) is 52.2%;
light-burned magnesium oxide: produced by Yingkolan magnesium industries, ltd;
light magnesium oxide: manufactured by Longxing chemical Co., ltd in Shanxi fortune cities;
activated magnesium oxide: chemical purity, manufactured by Xilonga chemical corporation;
limestone powder: manufactured by industry and trade company Limited in the Jing Huatai industry;
sodium water glass: manufactured by Xilonga chemical corporation;
silica fume: manufactured by Shandong Bocken silicon materials Ltd.
Example 1
The embodiment provides a chalcogenide magnesium cementing material, which comprises the following components:
66 percent of sulfur-containing magnesium slag, 25 percent of light-burned magnesium oxide, 5 percent of limestone powder, 1 percent of CA, 1 percent of sodium silicate with the modulus of 2.5 and 2 percent of silica fume
Example 2
The embodiment provides a chalcogenide magnesium cementing material, which comprises the following components:
48% of sulfur-containing magnesium slag, 45% of magnesium oxide (20% of light magnesium oxide and 25% of active magnesium oxide), 2% of limestone powder and 2% of aluminate (0.5% of CA and 25% of CA) 2 1.5%), 2% sodium silicate with modulus of 2.0, 1% silica fume.
Example 3
The embodiment provides a sulfur-based magnesium cementing material, which comprises the following components:
60% of sulfur-containing magnesium slag, 30% of magnesium oxide (12% of light-burned magnesium oxide, 11% of light magnesium oxide and 7% of active magnesium oxide), 3% of limestone powder and 4% of aluminate (CA 1%, C) 3 A0.5% and C 12 A 7 2.5%), 1% sodium silicate with a modulus of 1.5, 2% silica fume.
Examples 4 to 6
This example provides a chalcogenide magnesium cementitious material.
The difference from the example 3 is that in the present example, the mass ratio of the sulfur-containing magnesium slag to the magnesium oxide is adjusted to 1.6 (example 4), 2.2 (example 5), 1.3 (example 6).
Comparative examples 1 to 2
This comparative example provides a chalcogenide magnesium cementitious material.
The difference from example 3 is that in this example, the mass ratio of the sulfur-containing magnesium slag to the magnesium oxide was adjusted to 0.8 (comparative example 1), 3.5 (comparative example 2).
Example 7
This example provides a chalcogenide magnesium cementitious material.
The difference from example 3 is that in this example, no silica fume is added and the remaining components are proportioned.
Example 8
This example provides a chalcogenide magnesium cementitious material.
The difference from example 3 is that the amount of silica fume added in this example is 4% and the remaining components are adjusted in proportion.
Examples 9 to 10
The embodiment provides a sulfur-based magnesium cementing material.
The difference from example 3 is that the amount of the aluminate added in this example is 3% (example 9) and 8% (example 10), and the remaining components are adjusted in proportion.
Example 11
This example provides a chalcogenide magnesium cementitious material.
The difference from example 3 is that the amount of sodium water glass added in this example is 5% and the remaining components are adjusted in proportion.
Comparative example 3
This comparative example provides a chalcogenide magnesium cementitious material.
The difference from example 3 is that in this comparative example, magnesium oxide was not added, and the amount of the sulfur-containing magnesium slag added was 90%.
Comparative example 4
This comparative example provides a chalcogenide magnesium cementitious material.
The difference from example 3 is that in this comparative example, limestone powder was not added, and the amounts of the sulfur-containing magnesium slag and magnesium oxide added were adjusted in such a manner that the total mass of the sulfur-containing magnesium slag, magnesium oxide and limestone powder was not changed.
Performance testing
A cement hardened body was prepared using the chalcogenide magnesium cements provided in examples 1 to 11 and comparative examples 1 to 4 with reference to the following methods:
(1) Grinding the components except sodium silicate to specific surface area of 300m 2 More than kg;
(2) Mixing the sulfur-containing magnesium slag and water according to the water-cement ratio of 0.5, fully stirring, adding sodium silicate, and uniformly stirring;
(3) Mixing magnesium oxide, limestone powder, aluminate and optional silica fume, then mixing with the mixture obtained in the step (1), and then forming and curing (curing temperature is 20 +/-2 ℃ and humidity is more than or equal to 95%) according to a method specified in Highway engineering inorganic binder stable material test regulation (JTG E51-2009).
The 28d unconfined compressive strength and the 360d unconfined compressive strength of the test are tested according to the method specified in the standard JTG E51-2009, and the test results are shown in Table 1:
TABLE 1
Figure BDA0003547543460000091
As can be seen from the examples and performance tests, the cementing material provided by the disclosure can be applied by taking sulfur-containing magnesium slag as a raw material, and the finally obtained hardened body has relatively excellent strength and durability, wherein the 28d unconfined compressive strength is more than 39.5MPa, and the 360d unconfined compressive strength is more than 39MPa, so that the excellent durability is shown.
As is clear from a comparison between examples 3 to 4 and examples 5 to 6, in the present disclosure, when the sulfur-containing magnesium slag and magnesium oxide are added in an amount satisfying the requirement and the mass ratio of both is in the range of (1.5 to 2): 1, the strength and durability of the cement can be further enhanced. As is clear from a comparison between example 3 and comparative examples 1 to 2, in the present disclosure, the mass ratio of the sulfur-containing magnesium slag to the magnesium oxide needs to be in the limited range of (1.0 to 3.0): 1, in order to obtain a cement hardened body having superior strength and durability. Meanwhile, as can be seen from the comparison of examples 5 to 6, when the mass ratio of the sulfur-containing magnesium slag to the magnesium oxide is in the range of (1.0 to 3.0): 1 (not in the range of (1.5 to 2): 1), the increase in the amount of the sulfur-containing magnesium slag enables the strength of the hardened body of the cement to be high; as is clear from the comparison of comparative examples 1 to 2, when the mass ratio of the sulfur-containing magnesium slag to magnesium oxide is not in the range of (1.0 to 3.0): 1, similarly increasing the amount of the sulfur-containing magnesium slag added enables the strength of the hardened body of the cement to be high.
As can be seen from the comparison between example 3 and examples 7-8, the present disclosure prefers to add silica fume, and the silica fume is added in an amount of 2% or less, which can enhance the strength and durability of the cement. From a comparison of example 3 and examples 9-11, it is clear that the present disclosure prefers aluminates in the range of 1-5%, preferably 1-3%, and preferably sodium water glasses in the range of 1-3%, to be able to both increase the water stability of the material without affecting the strength. As can be seen from a comparison of example 3 and comparative examples 3 to 4, in the present disclosure, the sulfur-containing magnesium slag, magnesium oxide and limestone powder are all indispensable.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (15)

1. The sulfur-based magnesium cementing material is characterized in that the sulfur-based magnesium cementing material comprises sulfur-containing magnesium slag, magnesium oxide, limestone powder, aluminate, sodium silicate and silica fume;
wherein, by taking the total mass of the sulfur-containing magnesium cementing material as 100 percent, the content of the sulfur-containing magnesium slag is 48 to 68 percent, the content of the magnesium oxide is 25 to 45 percent, the content of the limestone powder is 2 to 5 percent, the content of the aluminate is 1 to 5 percent, the content of the sodium silicate is 1 to 3 percent, the content of the silica fume is 0.01 to 2 percent, and the mass ratio of the sulfur-containing magnesium slag to the magnesium oxide is (1.0 to 3.0): 1;
wherein the sulfur-containing magnesium slag comprises magnesium sulfite and/or magnesium sulfate.
2. The chalcogenide magnesium cement according to claim 1, wherein the mass ratio of the sulfur-containing magnesium slag to the magnesium oxide is (1.5-2.0): 1.
3. The chalcogenide magnesium cementing material according to claim 1, characterized in that the content of the sulfur-containing magnesium slag is 55-68%, the content of magnesium oxide is 25-35%, and the content of limestone powder is 2-5%.
4. The chalcogenide magnesium cement according to claim 3, wherein the limestone powder is 2-3% in content.
5. The chalcogenide magnesium cement according to claim 1, wherein the aluminate is present in an amount of 2-3%.
6. The chalcogenide magnesium cement according to claim 1, wherein the sodium water glass is present in an amount of 1-2%.
7. The chalcogenide magnesium cement according to claim 1, wherein the silica fume is present in an amount of 1-2%.
8. The chalcogenide magnesium cement according to any one of claims 1 to 7, wherein the composition of the sulfur-containing magnesium slag further comprises silica, calcium oxide, iron oxide and aluminum oxide;
and/or the magnesium oxide is selected from any one or more of light-burned magnesium oxide, light magnesium oxide or active magnesium oxide;
and/or the aluminate is selected from any one of monocalcium aluminate, calcium dialuminate, tricalcium aluminate or dodecacalcium heptaluminate or the combination of at least two of the monocalcium aluminate, the calcium dialuminate, the tricalcium aluminate or the dodecacalcium heptaluminate;
and/or the modulus of the sodium water glass is 1.5-2.5.
9. The chalcogenide magnesium cement according to claim 8, wherein the magnesium oxide is selected from light-burned magnesium oxide.
10. The chalcogenide magnesium cement according to claim 8, wherein the aluminate is selected from mono-and/or di-calcium aluminates.
11. The chalcogenide magnesium cement according to claim 8, wherein the sodium water glass has a modulus of 1.5 to 2.0.
12. The chalcogenide magnesium cement according to any one of claims 1 to 7, wherein the chalcogenide magnesium cement is a two-component cement, the component A is a combination of sulfur-containing magnesium slag, magnesium oxide, limestone powder, silica fume and aluminate, and the component B is sodium water glass.
13. The method of using the chalcogenide magnesium cement of any one of claims 1-12, wherein the method of using comprises:
(1) Mixing the sulfur-containing magnesium slag with water, and then adding sodium silicate;
(2) Mixing magnesium oxide, limestone powder, aluminate and silica fume, then mixing with the mixture in the step (1), and then molding and curing.
14. Use of a chalcogenide magnesium cement according to any of claims 1 to 12 for the preparation of magnesium concrete.
15. Use of the chalcogenide magnesium cementitious material according to any one of claims 1 to 12 in industrial buildings, civil buildings, road and bridge buildings.
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