Extraction of copper from the precipitate obtained by purifying the wash water formed in refining crude TiCl_4

摘要

Copper is used to remove vanadium from crude TiCl_4 in titanium sponge production which produces large wash water containing vanadium and copper. The precipitate containing copper and vanadium was formed from the wash water by oxidization and neutralization treatment. The vanadium in the precipitate can be recovered by NaOH leaching, after that, the cake containing copper was formed. The leaching of copper from the cake was investigated by H_2SO_4. Under the optimum leaching conditions (58% H_2SO_4 leaching for 30 min. at room temperature with a pulp density of 28.6%), the copper leaching could reach 90.4%.