METHOD OF PROCESSING OF FERROUS RARE-EARTH PHOSPHATIC ORES Russian patent published in 2015 - IPC C22B59/00 C22B3/06 

FIELD: metallurgy.

SUBSTANCE: ferrous ore is subjected to intensive machining to destruct mineral aggregates and for deep opening of the phosphate minerals of rare-earth minerals, yttrium and thorium, then ore is leached by solutions of the nitric acid at 180-240°C. Under such conditions the phosphate minerals of the listed elements completely decompose and go into solution, and escaping phosphoric acid is adsorbed on iron oxides (3+) with generation of the insoluble compounds, thus ensuring creation of the dephosphorized nitrate solutions suitable for extraction processing. Increased temperature ensures hydrolysis of the ferrous nitrates even in strongly acidic (nitric) solutions.

EFFECT: simplified method of difficult chamoisite processing using hydrometallurgy method ensuring separation to solution per single operation of the rare-earth metals, yttrium and thorium, and to separate them from phosphorus and iron, and decreasing of chemicals consumption due to exclusion of the alkali treatment.

2 cl, 1 tbl, 7 ex