In order to make the electrolyzing much easier and reduce the cost of molten salt electrolysis with rare earth fluoride system, NaF or other alkali fluorides are supposed to replace LiF currently used in RE electrolysis as additive.

The separation was achieved on AS9 anion separation column with sodium carbonate mobile phase,the detection was performed by a conductivity detector,quantitative analysis was conducted with a calibration curve by measuring the peak area,then sulphate content was calculated,that is the determination of sulphate content in rare earth carbonate and rare earth chloride.

The rule of granularity change in grinding of rare earth carbonate was discussed.

The raw materials of high function polishing powder come from rare earth carbonateThe technological conditions of preparing polishing powder from rare earth carbonate such as roasting and screening were studiedAccording to polishing rule,the effect factors of polishing was analysedSo the best technological conditions are found and high function polishing powder is produced