Beta-dicalcium silicate and preparation method thereof

Abstract

The invention relates to beta-dicalcium silicate and a preparation method thereof. The technical scheme comprises the following steps: mixing a calcium source, a silicon source and a barium source in a molar ratio of 1:(0.2-1):(0.02-0.05) to obtain a mixture; adding 80-120wt% of distilled water into the mixture and mixing uniformly; drying for 12-24 hours at 70-110 DEG C; performing fine grinding and mechanical pressing; preserving heat for 2-5 hours in an air atmosphere at 1,200-1,600 DEG C; and cooling along with the furnace to obtain beta-dicalcium silicate. In the technical scheme, the calcium source is one of calcium oxide, calcium hydroxide, calcium carbonate and calcium bicarbonate; the silicon source is silicon dioxide or metasilicic acid; and the barium source is one of barium carbonate, barium hydroxide and barium sulfate. The beta-dicalcium silicate has the characteristics of simple technology, low cost and easiness in operation; the prepared beta-dicalcium silicate has the advantages of no pulverization, high purity and few impurity phases; and a foundation is laid for widening the application of beta-dicalcium silicate in the field of silicate materials.

Description

technical field [0001] The invention belongs to the technical field of silicate materials. It specifically relates to a β-dicalcium silicate and a preparation method thereof. Background technique [0002] Studies in recent years have shown that a layer of dicalcium silicate (Ca 2 SiO 4 , referred to as C 2 S) Protective layer. In high temperature environment, C 2 S has the characteristics of high melting point and high viscosity, which can prevent the clinker slag from further corroding the kiln lining, thereby prolonging its service life. [0003] C 2 S has α, β, γ, α L 、α H Five crystal forms, γ-C 2 S is a stable crystal phase at room temperature, β-C 2 S is a metastable crystal phase, and other phases are high temperature crystal phases. When slowly cooling down to about 500°C, C 2 S will have a density of 3.28g / cm 3 The β-type transforms to a density of 2.97g / cm 3 The gamma type produces about 10% volume expansion. Studies have shown that the C formed on t...

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Problems solved by technology

[0005] The existing preparation methods or processes of β-dicalcium silicate are relatively complicated, or need to adopt rapid cooling measures, or the selected stabilizer will cause impurity in the material, thereby limiting the β-dicalcium silicate in silicate Promotion and application in the field of materials

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