Silicon smelting waste residue foam microcrystalline glass and preparation method thereof

Abstract

The invention relates to silicon smelting waste residue foam microcrystalline glass and a preparation method thereof. The glass takes silicon smelting waste residue as a main raw material, and takes SiO2, CaCO3, Na2CO3, ZnO, K2CO3 and other additives and clarifying agents as auxiliary materials. The preparation method comprises the following steps: uniformly mixing the cold silicon residue and the auxiliary materials in a mixer, and melting at a high temperature in a melting furnace to obtain a qualified glass solution; cooling the glass solution to obtain base glass; smashing the base glass, and thoroughly mixing with a foaming agent, a foam stabilizer and regulation components to form a sintering batch; and feeding the sintering batch into a combined mold, then integrally transferring the sintering batch into a heat treatment kiln together with the mold, firing, annealing, cooling, and demolding to obtain the foam microcrystalline glass. According to the invention, the foam microcrystalline glass is light in weight and resistant to wear and acid / alkali corrosion, can keep warm, has favorable machinability, and can be widely used for heat insulation and warm keeping of pipelines, storage tanks and heat exchange systems in the fields of chemical industry, metallurgy, architectural decoration, petroleum, mines, machinery and the like as well as composite heat insulation systems and sound insulation / absorption systems working under special conditions.

Description

technical field

[0001] The invention relates to a foamed glass-ceramic, especially to a foamed glass-ceramic prepared by utilizing silicon smelting waste slag discharged during polysilicon refining and smelting, and a preparation method thereof. Alkali corrosion and foamed glass-ceramics with good machinability can make large use of industrial solid waste silicon smelting slag, and the product has excellent physical and mechanical properties and stable chemical properties. Background technique

[0002] In the process of producing polysilicon by metallurgical method, slagging oxidation refining has many advantages such as simple process, low cost and less pollution. The slagging oxidation refining process is to add refining slag with a higher melting point than metallurgical silicon to metallurgical silicon, and perform oxidation refining between the melting points of silicon and slag. Usually when the ratio of slag to gold is η=3, the effect of slag removal is the best. Af...

Images