NITROGEN TRIFLUORIDE PRODUCTION METHOD

摘要

The invention relates to methods for producing a nitrogen trifluoride by electrolysing ammonium fluoride fluorohydric melts in an electrolyzer provided with carbon (nickel) anodes and steel cathodes and an anode bell and is characterised in that the louver cathodes are used for electrolysis and the anode bell is placed above electrodes, wherein the electrolyte mirror surface area below the anode bell is equal to or less than 0.2 of the entire surface area thereof, the depth of the bell immersion into electrolyte is equal or greater than the height of electrodes, a cathode-bell distance is equal to or greater than 0.025 the electrode height (B), the cathode-bell distance is equal to or greater than 0.025 the electrode height in the case of a carbon anode and equal to or greater than 0.05 the electrode height in the case of a nickel anode, the electrolyte specified level is maintained in the electrolyzer by supplying a gaseous fluorohydric acid and a gaseous ammonium is continuously supplied, wherein an operating electrolysis is initiated when the ammonium mass fraction in the electrolyte ranges from 25 to 26 % and the ammonium supply rate is modifiable according to a NF<SUB>3</SUB> content in an anode gas.