Rutile is recovered from copper ore tailings by froth flotation of sulfides and carbonates at ph 9-10 with sodium isopropyl xanthate and sodium oleate as collectors and dextrin as rutile depressor, and flotation of rutile from the tailings at ph 2-3 with hf and petroleum sulfonate as collector. Thus, a rutile-containing fraction was conditioned with sodium isopropyl xanthate 0.1, Dowfroth 0.12, Dextrin 0.3, Na2co3 0.5, and sodium oleate 0.2 Lb/ton feed at ph 9.8. The nonfloating fraction was filtered, repulped with petroleum sulfonate promoter 825 1, hf 0.5, and h2so4 4 lb/ton, and floated at ph 2.4. The rutile cleaner concentrate contained 34.8 pct tio2.
U.S. Pat. 4,362,615, Dec. 7, 1982; Chem. Abstr. 97:166,805U