Abstract: A large rubidium deposit in our country is considered as the first domestic deposit with Rb₂O grade of 0.12% and the total metal volume of nearly 100 000 t.The rubidium exists in biotite in form of isomorphism.Beneficiation experiments were carried out to efficiently recover the rubidium.The results showed that at the grinding fineness of 60% passing 0.074 mm,rubidium concentrate with Rb2O grade of 0.28% and recovery of 65.93% was obtained through the flotation process of two roughing-three cleaning,and middles back to the flow-sheet in turn.With good flotation index,rubidium can be well recovered by this process.

Key words: Rubidium, Biotite, Isomorphism, Flotation