METHOD OF PROCESSING LOW-QUALITY NEPHELINE ORES Russian patent published in 2007 - IPC C01F7/38 

FIELD: processing nepheline ores for forming source of raw materials for alumina industry.

SUBSTANCE: proposed method includes preparation of nepheline-soda-lime charge from low-quality nepheline ores at content of Al₂O₃ lesser than 25% and addition of high-quality nepheline ore at content of Al₂O₃ no less than 26.5% to ensure content of Al₂O₃ in nepheline ore mixture of 23.9-25.9%. Bauxite is additionally added to charge in the amount of 10-20% of weight of mix at content of Al₂O₃ of 40-53%. Then, sintering and hydrochemical treatment are performed for obtaining alumina and soda products.

EFFECT: enhanced efficiency of processing low-quality nepheline ores.

5 tbl, 8 app, 4 ex