Method for preparing calcium aluminosilicate nanometer microcrystal glass by utilizing natrium silica calcium glass waste slag

Abstract

The invention provides a method for preparing calcium aluminosilicate nanometer microcrystal glass by utilizing natrium silica calcium glass waste slag. The method comprises the following steps: 1) classifying, grinding and screening natrium silica calcium glass waste slag to prepare glass powder; 2) adding silicon dioxide, calcium oxide, aluminum oxide, boron oxide, TiO2/P2O5 composite nucleating agent and rare-earth oxide to ensure that component requirement of the calcium aluminosilicate (CAS) microcrystal glass can be fulfilled; 3) filling the uniformly mixed glass materials into a high-alumina crucible, and pouring into a die to press and mold; and 4) putting the pressed glass plate in a muffle furnace for heat treatment, cooling to room temperature with the furnace after heat treatment to obtain the CAS nanometer microcrystal glass. The method has the advantages that: (1) the mechanical performance of the microcrystal glass is greatly improved; and (2) the additive dosage is adjusted according to the component composition of the glass residues to ensure that the glass achieves the regulated formula proportion. The method is suitable for the conventional various civil natrium silica calcium glass waste slag.

Description

technical field [0001] The invention relates to a method for nano-glass ceramics, in particular to a method for preparing calcium-aluminum-silicon nano-glass-ceramics by utilizing waste slag of nano-silicon-calcium glass. Background technique [0002] Glass-ceramics, also known as glass-ceramics, is a polycrystalline solid material containing a large number of microcrystalline phases obtained by heat-treating certain basic glasses of specific composition. Calcium-aluminum-silicate (CAS) glass-ceramics can use mine tailings, metallurgical slag, fly ash, etc. as the main raw materials, and the production process is non-polluting, and the product is non-radioactive, so it is also called environmental protection material or green material. The performance, decorability and service life of CAS glass-ceramics are superior to those of natural stone, artificial stone and floor tiles. They have been used in high-end buildings such as hotels, stations, airports, office buildings, sub...

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Problems solved by technology

However, the preparation of architectural glass-ceramic by sintering molding method has the disadvantages of shallow densification depth of the surface layer (about 2 mm); the pores between glass particles are difficult to get rid of, and the compactness is poor; the product is prone to deformation and has high requirements for refractory molds.

The proportion of the crystallite phase in glass-ceramics prepared by melting method depends on the overall crystallization ability of the base glass. Due to the limitation of the composition of ordinary soda-lime-silica glass, the crystallization ability of the base glass is poor. The technology of building glass-ceramics with glass waste as the main material is still rarely reported

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