Study on Synthesis Procedure of Rare Earth Citrate Complexes from Ln(La,Ce)Cl₃ Solutions in Laboratory Scale at 100g/Batch

Synthesis processing of rare earth (La, Ce) citrate complexes were carried out in laboratory scale of 100g/batch from 200g/L concentration Ln(La, Ce)Cl₃ solutions that is calculated by total rare earth oxides in which 50% La₂O₃ and 50% CeO₂. Rare earth citrate complexes were synthesized by using citric acid and Ln(La,Ce)Cl₃ solution. The experimental results showed that the optimum conditions are as follows: time reaction is 5 hours, temperature is 80℃, pH is 3.5, molar ratio of materials is 1.25∶1. The efficiency of the complexing reaction was over 95% at scale 100g/batch. The formula and chemical composition of the rare earth citrate complexes were determined by thermal analysis, infrared spectroscopy and ICP-MS. This research products will be added to feed in the further studies. (author)