Method for preparing xonotlite powder from fused quartz as raw material

Abstract

The invention relates to a method for preparing xonotlite powder from fused quartz as a raw material. The method comprises the following steps: with fused quartz and calcium oxide as raw materials, weighing the fused quartz and calcium oxide at the molar ratio of Ca / Si being 1.01:1 to 1.05:1; adding distilled water according to the water-solid mass ratio of 10:1 to 20:1, and stirring evenly; adding the prepared slurry to a high-pressure reaction kettle, carrying out electric stirring at the speed of 200-400r / min, and reacting at 160-210 DEG C, wherein the pressure of the reaction kettle is 1.5-2.5MPa; carrying out heat preservation for 2-6 hours, turning off a power supply after heat preservation is finished, stopping stirring, and naturally cooling; and taking out reaction slurry, filtering, and baking, so as to obtain the xonotlite powder. The xonotlite powder prepared by the method has the advantages of simple process, low reaction temperature and short heat preservation time; and the synthesized xonotlite powder is high in purity.

Description

technical field [0001] The invention relates to the field of inorganic non-metallic materials, in particular to a method for preparing xonotlite powder by using fused silica as a silicon raw material. Background technique [0002] Calcium silicate insulation material has excellent properties such as low density, low thermal conductivity, high compressive and flexural strength, low loss rate, reusable, convenient construction, environmental protection, and human-friendly, and is widely used in plastics, coatings, ceramics, etc. Traditional industries such as metallurgy, metallurgy, and building materials have also developed in emerging frontier fields such as aerospace, electronic technology, life sciences, and medical materials in recent years. [0003] Calcium silicate thermal insulation materials used for thermal insulation mainly include two different calcium silicate hydrate crystal products: one is tobermolite type, the maximum service temperature is 650 ° C, and genera...

AI Technical Summary

Problems solved by technology

Moreover, there has been no report on the use of fused silica as a siliceous raw material to synthesize xonotlite. At the same time, due to the high activity of fused silica, high-purity xonotlite can be synthesized at a lower reaction temperature and shorter holding time, which meets the high-end requirements in recent years. Product requirements for wollastonite raw materials

Images