METHOD FOR PRODUCING LANTHANUM CARBONATE HYDRATE

摘要

High-purity lanthanum carbonate hydrate which has a small element impurity content can be produced by adding a carbonate salt, e.g., sodium carbonate, to an aqueous solution prepared by reacting lanthanum oxide with an acid capable of producing a soluble salt of lanthanum, e.g., hydrochloric acid, to adjust the pH value of the aqueous solution to 2.9 to 4.5 to produce a solid matter, then removing the solid matter to produce a liquid fraction, and then adding a carbonate salt to the liquid fraction to adjust the pH value of the liquid fraction to 5.5 to 7.