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

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...

AI Technical Summary

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.

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