Method for stepwise extraction of silica and hydroxide from silicate substances

• Main Authors: Zhang, Minmin, Yan, Hua, Shi, Zhiming, Yin, Wendi, Wang, Cunquan, Liu, Tao
• Format: Patent
• Language: English
• Published: 25.08.2022
• Subjects: APPARATUS THEREFOR; CHEMISTRY; COMPOUNDS THEREOF; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTIONOF COMPOUNDS OR NON-METALS; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

A method for stepwise extraction of silica and hydroxide from silicate substances. The silicate substances are leached by chlorine-containing inorganic acids, and the hydroxides are extracted step by step from the leaching liquor by electrochemical deposition method; The raw material of the powder is put in the reactor, inorganic acids, water-soluble alcohol and water are added as the leaching liquor, heated and reacted under the condition of 0.1 MPa or more, and the acidic multi-ion mixed solution and filter residue are obtained by filtration. The acidic multi-ion mixed solution is heated and boiled, and the silicon-containing volatile components are collected, decomposed and deposited in the collector; The deposited volatile components is dried to obtain high purity silica powder; The filter residue is washed and dried to obtain silica; The hydroxides are extracted from the acidic multi-ion mixed solution by electrochemical deposition method.