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Calcium magnesium sulfate compound salt binder as well as preparation method and application thereof

A technology of calcium magnesium sulfate physics and calcium magnesium sulfate chemistry, applied in the field of inorganic cementitious materials and building materials, can solve the problems of high processing cost, huge total amount, and restrictions on popularization and application, and achieve excellent physical and mechanical properties and low energy consumption. Effect

Active Publication Date: 2019-05-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This has led to a comprehensive utilization rate of less than 30% of the industrial by-product gypsum, that is, about 120 million tons of industrial by-product gypsum are stacked and stored every year, which not only causes waste of resources, but also contains some soluble acid Substances, these acidic substances in stacking and storage will pollute the water and soil environment
However, the production of sulphoaluminate cement requires high-grade bauxite as a key raw material, and bauxite is not only an important raw material for the alumina and electrolytic aluminum industries, but also has a small storage capacity and a small distribution area. Therefore, this The popularization and application of a technical invention is also subject to relatively large restrictions
Chinese patent CN201610034309.1 discloses a technical scheme of using low-grade bauxite to prepare low-carbon cement clinker, but the proportion of calcium sulfate in cement mass is less than 15%
Although there are some technical solutions and equipment for recycling waste sulfuric acid, industrial waste sulfuric acid has the characteristics of complex impurity components, high treatment costs, huge total volume and scattered industries, which brings great difficulties to resource utilization and harmless treatment.

Method used

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  • Calcium magnesium sulfate compound salt binder as well as preparation method and application thereof
  • Calcium magnesium sulfate compound salt binder as well as preparation method and application thereof
  • Calcium magnesium sulfate compound salt binder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～ Embodiment 3

[0048] The calcium-magnesium sulfate double-salt cementing material powder in Examples 1 to 3 is formed by mixing calcium-magnesium sulfate physical double salt, light-burned magnesium oxide powder and limestone powder, and the design ratio of each component is shown in Table 2; wherein, Calcium-magnesium sulfate physical double salt is desulfurized dihydrate gypsum discharged from the calcium desulfurization process, and magnesium sulfate heptahydrate produced by the magnesium desulfurization process. After being heated and dehydrated in an open environment at 120-180 ° C, the solids are ground and dried. The powder obtained by passing through a 0.075 mm square hole sieve; light-burned magnesia was purchased from an enterprise in Haicheng City, Liaoning Province, and its chemical composition is shown in Table 3.

[0049]Composition and mix ratio of physical double salt cementing material in table 2 embodiment 1~embodiment 3

[0050]

[0051] Table 3 Chemical composition of...

Embodiment 4～ Embodiment 6

[0055] The calcium-magnesium sulfate double-salt cementing material powder in embodiment 4~embodiment 6 is mixed by calcium-magnesium sulfate physical double salt and light-calcined magnesium oxide powder, and its each component design ratio is shown in Table 4; Wherein, calcium-magnesium sulfate The physical double salt is phosphogypsum slag discharged from a phosphorus chemical enterprise, and magnesium sulfate heptahydrate produced by the magnesium desulfurization process. After being heated and dehydrated in an open environment at 120-180°C, the solid is ground and passed through a 0.075mm Square-hole sieve, the powder that makes; Lightly burned magnesia is identical with embodiment 1.

[0056] In order to test the strength of the calcium-magnesium sulfate double-salt cementing material in Examples 4 to 6, these three powders were mixed with water to form a double-salt cementing material slurry with water-solid ratios of 0.55, 0.41 and 0.39, respectively. After mixing even...

Embodiment 7～ Embodiment 9

[0062] The calcium-magnesium sulfate double-salt cementing material powder in embodiment 7~embodiment 9 is made of calcium-magnesium sulfate chemical double salt [Mg 2 Ca(SO 4 ) 3 ], light-burned magnesia powder and desulfurized building gypsum are mixed, and the design ratio of each component is shown in Table 6; wherein, calcium magnesium sulfate chemical double salt is desulfurized dihydrate gypsum discharged from the calcium desulfurization process, magnesium desulfurization After the magnesium sulfate heptahydrate produced by the process is fired in a high-temperature furnace at 725°C to 750°C, the cooled solid is ground and passed through a 0.075mm square hole sieve to obtain a powder; desulfurized building gypsum and comparative example 1 Identical; Lightly burned magnesia powder is identical with embodiment 1.

[0063] Composition and compounding ratio (mass parts) of chemical double salt cementing material in Table 6 embodiment 7~9

[0064] Example

Cal...

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Abstract

The invention discloses a calcium magnesium sulfate compound salt binder as well as a preparation method and application thereof. The calcium magnesium sulfate compound salt binder is prepared from the following components: calcium magnesium sulfate compound salt, active magnesium oxide and mineral powder, wherein the calcium magnesium sulfate compound salt is desulfurized calcium magnesium compound salt powder discharged during a flue gas desulfurization process of a kiln, waste acid calcium magnesium compound salt formed by treating industrial waste sulfuric acid by using dolomite or gypsum-based calcium magnesium compound salt powder by heating and dehydrating an industrial byproduct-gypsum raw residue under the existence of magnesium sulfate; the other mineral powder is prepared from pulverized fuel ash, limestone powder, dolomite powder, building gypsum and the like. According to the calcium magnesium sulfate compound salt binder disclosed by the invention, a new technology of economic and efficient utilization of a flue gas desulfurization product, the industrial waste sulfuric acid and ardealite is provided, the prepared compound salt binder has excellent physical and mechanical properties and has prominent characteristics of fast coagulation, high strength and good water resistance, and multiple social benefits of environment protection, economy, new materials and the like are obtained. The preparation method of the calcium magnesium sulfate compound salt binder is simple and easy, and the energy consumption is low.

Description

technical field [0001] The invention relates to a calcium-magnesium sulfate double-salt cementing material and a preparation method and application thereof, belonging to the field of inorganic gelling materials and building materials. Background technique [0002] In the field of inorganic gelling materials, they are generally divided into two categories: hydraulic and air-hardening gelling materials. Commercial cements such as Portland cement, aluminate cement and sulphoaluminate cement are hydraulic cementing materials; various building gypsums are air-hardening cementing materials. Their essential difference is that the main hydrates of hydraulic cementitious materials are highly stable in water, so the slurry made of this type of cement and water can develop and maintain its microstructure and physical and mechanical properties in water; The main hydrates of hard gelling materials have poor water stability and are soluble. Therefore, the slurry made of such gelling mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B9/06C04B9/04
Inventor 邓德华吴晓燕元强刘赞群李珂
Owner CENT SOUTH UNIV
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