Title:
METHOD FOR PRODUCING COLLOIDAL SILICA AND SYNTHETIC SILICA POWDER
Document Type and Number:
Japanese Patent JP2023145845
Kind Code:
A
Abstract:
To provide a method for producing ultra-high purity colloidal silica and synthetic silica powder.SOLUTION: The present invention enables ultra-high purity colloidal silica to be obtained by removing undissolved silica in alkali silicates. A method for producing ultra-high purity colloidal silica is provided that involves mixing silica or an industrial alkali silicate with an alkaline aqueous solution so that a molar ratio of SiO2/Na2O is from 1.0 to 2.0, allowing the mixture to undergo reaction with heat and thereafter confirming a complete reaction of the silica, adding an oxidizing agent for filtration and passing the filtrate through a sodium-type cation-exchange resin, and adding a reducing agent and passing the filtrate through a hydrogen-type cation-exchange resin.SELECTED DRAWING: None
Inventors:
WATABE HIROYUKI
Application Number:
JP2022052710A
Publication Date:
October 12, 2023
Filing Date:
March 29, 2022
Export Citation:
Assignee:
NABESHO GSK
International Classes:
C01B33/18; C03B8/02; C03B20/00
Previous Patent: Heat pipe fixed structure and satellite
Next Patent: Underground electric wire construction method and road surface cover
Next Patent: Underground electric wire construction method and road surface cover