METHOD FOR PREPARING HYDROFLUORIC ACID BY RECYCLING FLUOSILICIC ACID

• Main Authors: WU, Shixian, LAI, Shenghua, HU, Xin
• Format: Patent
• Language: Chinese; English; French
• Published: 19.09.2024
• Subjects: APPARATUS THEREFOR; CHEMISTRY; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTIONOF COMPOUNDS OR NON-METALS; METALLURGY

The present invention relates to the field of electrochemistry, and in particular to a method for preparing hydrofluoric acid by recycling fluosilicic acid. The method comprises: 1) preparing an electrolytic cell, the electrolytic cell comprising an anode region and a cathode region, the cathode region and the anode region being respectively provided with an inert cathode and an inert anode, the anode region being separated from the cathode region by means of an anion exchange membrane, ammonia water being poured in the cathode region to serve as a catholyte, and the anode region using a hydrogen sulfide aqueous solution as an electrolyte, so as to construct an electrolysis system; and (2) controlling the electrolysis system to be electrified and electrolyzed, slowly adding a fluosilicic acid solution into the catholyte in the cathode region, supplementing hydrogen sulfide gas into the electrolyte in the anode region, and recycling the electrolyte, i.e., a hydrofluoric acid aqueous solution, in the anode regi