The rare earth(La, Pr, Nd, Sm) methoxides were synthesized in the condition of alkaline earth alkoxides as the providers of alkoxy, anhydrous rare earth acetates as the raw materials.

The rare earth (La, Pr, Nd, Sm) alkoxides (methoxide, ethoxide and isopropoxide) were synthesized by a new method using alkaline earth metal calcium, lower alcohols(CH_(3)OH, C_(2)H_(5)OH, C_(3)H_(7)OH) and anhydrous rare earth acetates as raw materials, and aromatic solvent as reaction medium.

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

A series of novel solid complexes of rare earth nitrates with SEO 2 have been synthesized in ethyl acetate.

Adding different quantity of rare earth nitrate to the Carassius auratus feed and researching the effect of rare earth on the production performance and nutritional status of Carassius auratus.