Preparation method of silica

A silicon dioxide and carbon dioxide technology, applied in the production of silicon dioxide, silicon oxide, bulk chemicals, etc., can solve the problems of complicated process, time-consuming, high temperature, etc.
CN102020284AActive Publication Date: 2011-04-20XIAMEN UNIV +1
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
XIAMEN UNIV
Publication Date
2011-04-20

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Abstract

The invention provides a preparation method of silica, relating to a preparation method of silica materials. In the preparation method, sodium silicate aqueous solution is pumped into a carbonization agitated reactor, supercritical carbon dioxide or subcritical carbon dioxide is added into the carbonization agitated reactor for reaction, so that a reaction product silicide is obtained; after washing and filtering, filtrate enters an evaporator, and carbonate is recycled; a filter cake is pulped by solvent and then forms supercritical fluid which enters a supercritical drying kettle; and after drying, the solvent and the supercritical fluid are separated under reduced pressure in a separation tank, the pressure of the supercritical drying kettle is released, and the product of silica is obtained.
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Description

Technical field

[0001] The invention relates to a method for preparing silica materials, in particular to a method for preparing silica using super / subcritical fluid to participate in carbonization reaction (supercritical carbonization reaction) coupled with supercritical fluid drying (supercritical drying). Background technique

[0002] Silica powder is an amorphous white powder. It is a non-toxic, odorless, and non-polluting non-metallic material. Its microstructure is flocculent and net-like quasi-particle structure. This special structure makes it have unique properties, such as: special optical and electrical properties, high magnetoresistance, nonlinear resistance, and high strength, high toughness, and good stability at high temperatures. It is widely used in catalyst carriers, decolorizers, matting agents, thermal insulation materials, rubber reinforcing agents, plastic fillers, ink thickeners, soft metal polishing agents, insulating and thermal insulation fillers, filler...

Claims

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