ELECTROLYTIC METHOD FOR OBTAINING SILICON FROM MOLTEN SALTS Russian patent published in 2022 - IPC B82B1/00 B82B3/00 

FIELD: silicon production.

SUBSTANCE: invention relates to the methods for producing silicon, which is widely used in the electronic and metallurgical industries, and can also be used to create safe lithium-ion chemical current sources. An electrolytic method for obtaining silicon from molten salts, including the electrolysis of a halide melt with the addition of K₂SiF₆ at a temperature of 400 to 650°C, a cathode current density not higher than 0.1 A/cm² and a cathode potential in the range from -0.15 to -0.4 V relative to the potential of the silicon electrode, at the same time, a mixture containing, wt.%, is used as an electrolyte: 0-30 - lithium chloride (LiCl); 10-30 - potassium chloride (KCl); 55-85 - cesium chloride (CsCl); not higher than 3 - cesium fluoride (CsF); 0.1-5 - potassium hexafluorosilicate (K₂SiF₆).

EFFECT: obtaining silicon while increasing energy efficiency by reducing the electrodeposition temperature by 140–290°C and increasing the cathode current density to 0.07 A/cm².

1 cl, 2 dwg, 1 tbl