US 11,851,333 B2
Method for stepwise extraction of silica and hydroxide from silicate substances
Zhiming Shi, Inner Mongolia (CN); Wendi Yin, Inner Mongolia (CN); Hua Yan, Inner Mongolia (CN); Minmin Zhang, Inner Mongolia (CN); Tao Liu, Inner Mongolia (CN); and Cunquan Wang, Inner Mongolia (CN)
Filed by INNER MONGOLIA UNIVERSITY OF TECHNOLOGY, Inner Mongolia (CN); and Inner Mongolia Zhanhua Technology Co., Ltd., Inner Mongolia Autonomous R (CN)
Filed on May 27, 2021, as Appl. No. 17/331,652.
Claims priority of application No. 202110207136.X (CN), filed on Feb. 24, 2021.
Prior Publication US 2022/0267159 A1, Aug. 25, 2022
Int. Cl. C01B 33/12 (2006.01); C25B 1/20 (2006.01); C25B 15/02 (2021.01)
CPC C01B 33/128 (2013.01) [C25B 1/20 (2013.01); C25B 15/02 (2013.01); C01P 2002/72 (2013.01); C01P 2006/80 (2013.01)] 10 Claims
 
1. A method for stepwise extraction of silica and hydroxide from silicate substances, the method comprising:
putting a raw material of silicon-containing inorganic solid waste or silicon-containing natural sand powder into a reactor, and adding mixed acid as a leaching solution composed of chlorine containing inorganic acid X, inorganic acid Y, inorganic acid Z, water-soluble alcohol and water, said leaching solution is heated and reacted under the condition of greater than or equal to 0.1 MPa, after the reaction, filtered to obtain an acidic multi-ion mixed solution and filter residue;
heating and boiling the acidic multi-ion mixed solution and collecting with a collector silicon-containing volatile components, the silicon-containing volatile components are decomposed and deposited in the collector, and the remaining acidic multi-ion mixed solution is cooled for standby use;
drying amorphous silica dioxide decomposed and deposited in the collector to obtain high purity silica powder;
washing and drying the filter residue to obtain silica;
extracting the remaining acidic multi-ion mixed solution by electrochemical deposition method to obtain hydroxide.