Question

What is Separation of lanthanides by fractional crylatllisation method

Answer 1

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$\mathfrak{\green{Answer.}}$Sulfuric acid can also be used to dissolve the lanthanides. These can be divided into four types: chemical separations, fractional crystallization, ion-exchange methods and solvent extraction. Of these, only the last-named is used on a commercial scale (apart from initial separation of cerium).
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Answer 2

A process by which a chemical compound isseparated into components by crystallization. In fractional crystallization the compound is mixed with a solvent, heated, and then gradually cooled so that, as each of its constituent components crystallizes, it can be removed in its pure form from the solution.