PROCESSING METHOD OF LOW-GRADE MOLYBDENITE CONCENTRATES Russian patent published in 2013 - IPC C22B34/34 C22B3/06 

FIELD: metallurgy.

SUBSTANCE: method involves two-stage processing of concentrates with water solution of nitric acid, pulp filtration so that cake and molybdenum-containing solution is obtained. Then, calcium molybdate suitable for making of ferromolybdenum is deposited from the solution. Decomposition of concentrates is performed at addition to water solution of nitric acid, sulphuric acid in the quantity sufficient for retention of the whole molybdenum in the solution in composition of water-soluble sulphate compounds of molybdenyl, and namely with anionic complex [MoO₂(SO₄)₂]^2-.

EFFECT: creation of economic and environmentally safe technology allowing to process low-grade molybdenite concentrates as per a short scheme, which provides sufficient increase in throughout extraction of molybdenum and its associated metals from ores to commodity products, and thus, contributes to more rational use of mineral resources.

2 cl, 3 tbl, 2 ex