METHOD OF PROCESSING FINAL TAILINGS Russian patent published in 2009 - IPC C22B7/04 C22B3/10 C22B34/22 

FIELD: metallurgy.

SUBSTANCE: final tailings are leached with circulating concentrated hydrochloric acid at boiling temperature of hydrochloric pulp of 103-109°C thereby producing gaseous mixture of water vapours, hydrogen chloride and hydrochloric acid solution containing titanium, vanadium, iron, chromium, manganese and cake. Produced cake is washed and dried; so final product is obtained in form of concentrate of silicon oxide. The following compositions of metals are extracted by selective sedimentation out of obtained hydrochloric acid solution in three stages: titanium hydroxide, hydrated vanadium pentaoxide, mixture of iron and chromium oxides and basic manganese carbonate. Vapour-gas mixture of water and hydrogen chloride formed in each stage of metal composition extraction is condensed producing circulating hydrochloric acid. The acid is used for washing sediments of metal compounds and for leaching of source final tailings.

EFFECT: selective and waste-free extraction of compounds of titanium, vanadium, iron, chromium and manganese out of final tailings and producing commodity products in form of concentrates of titanium dioxide, vanadium pentaoxide, and mixture of iron, chromium and manganese oxides performed in closed process circuit.

1 dwg, 3 tbl