Displacement electrodialysis method for preparing potassium fluoride from potassium chloride and ammonium fluoride

• Main Authors: MIAO MENGJIE, SHEN JIANGNAN, QIU YANGBO, LIAO JUNBIN
• Format: Patent
• Language: Chinese; English
• Published: 18.01.2019
• Subjects: CHEMISTRY; COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM; INORGANIC CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention discloses a displacement electrodialysis method for preparing potassium fluoride from potassium chloride and ammonium fluoride. According to the method, the potassium fluoride is prepared through a displacement electrodialysis device. The method comprises the following steps of (1) compounding a 15-30wt.% potassium chloride aqueous solution and a 5-15wt.% ammonium fluoride aqueous solution; (2) enabling the cathode of the displacement electrodialysis device to be connected with a negative pole of a DC power supply, and the anode of the displacement electrodialysis device to be connected with a positive pole of the DC power supply, respectively enabling the 15-30wt.% potassium chloride aqueous solution, the 5-15wt.% ammonium fluoride aqueous solution, pure water, pure water and a 3wt.% sodium sulphate solution to flow into a diluting compartment A, a diluting compartment B, a concentrating compartment A, a concentrating compartment B and a pole liquid compartment, enablingthe flow quantity of liq