Influence of current efficiency on production of elemental boron by salt electrolysis

The current efficiency is a key factor to affect the output and power consumption of elemental boron production by molten salt electrolysis.It is of great significance for main economic and technical indexes to improve unit output and reduce the unit power consumption,etc.in the design of electrolysis tank.The system consisting of potassium fluoride-potassium chloride-potassium borofluoride was used in the experiment.The influences of electrolytic temperature,current density of cathode and distance between the poles upon the current efficiency and electrolytic time were investigated.The results show that when reaction temperature is 760-790 ℃,the electrolytic time is 2.5-3 h,current density of cathode is 0.8-1.14 A/cm2,and distance between poles is 4 cm,the current efficiency is at the highest point in electrolysis.