Patent ID: 11958764
Assignee: SEABRIDGE GOLD INC.
Field: Environmental technology (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A process for continuously removing dissolved selenium species from an input water stream comprising a dissolved aqueous selenate (Se(VI)) at an initial Se(VI) concentration, wherein the process removes the dissolved Se(VI) from an acidic reduction medium by reduction of the dissolved Se(VI) with chromous (Cr(II)) ions at an initial Cr(II)/Se(VI) molar ratio of 8 or above, whereby at least 95% of the Se(VI) is reduced to form a hydrogen selenide (H2Se) product within a reaction time of less than 5 hours, to provide a lowered-Se(VI) solution having a final Se(VI) concentration that is lower than the initial Se(VI) concentration, and wherein the Cr(II) ions comprise recycled Cr(II) ions produced by the process.