Process for preparing nano silicon dioxide by rice straw ash

Abstract

A process for preparing SiO2 nano-particles from rice husk ash includes such steps as dispersing the rice husk ash in the solution of hydrochloric acid, stirring, filtering to obtain filtered dregs, washing with deionized water, filtering, dispersing the filtered dregs in NaOH solution, boiling, filtering, using boiling water to flush the filtered dregs, collecting filtrate, dripping HCl to become gel, constant-temp drying, and high-energy ball grinding.

Description

technical field [0001] The invention relates to a method for preparing nano silicon dioxide. Background technique [0002] Nano-silica is widely used in high-tech fields such as communications, electronics, and aviation. At present, the following three methods are mainly used for the preparation of nano-silica. One is the gas phase method: using silicon tetrachloride as raw material, four Silicon chloride gas is hydrolyzed under the high temperature of hydrogen and oxygen flow to produce smoky silica; the second is the precipitation method: the silicate is loose, finely dispersed and precipitated in a flocculent structure through acidification; the third is the gel method: Adding acid reduces the alkalinity and induces the polymerization reaction of silicate, so that the particle size of the highly polymerized silicate ion in the form of colloidal particles in the system increases continuously, forming a silica sol. As the pH value of the system decreases, through the surfac...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of high cost, high energy consumption, complex technology, high equipment precision requirements and large pollution in the existing preparation method of nano silicon dioxide, and provide a method for preparing nano silicon dioxide with rice husk ash. Silicon oxide method