Method for reducing chromium
AssigneeMetafix Inc.
InventorsAbdelaziz Gherrou, John Riviere
Life of this patent
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Abstract
The present invention relates to method and a system of reducing chromium (VI) from a chromium bearing solution. The reduction of the chromium (VI) is achieved by contacting the chromium bearing solution which comprises chromium (VI) ions in an aqueous solution with iron fibers in an exchange mass under oxidation-reduction potential conditions at a pH of at least 2.5, with entry of iron ions into solution in the aqueous solution and reduction of the chromium (VI) ions to chromium (III) recovered in the exchange mass. A solution substantially free of chromium (VI) ions and total chromium is produced and discharged from the exchange mass.
Claims7
A system for reducing chromium from a chromium bearing solution, the system comprising:
- a) at least one column defining:
- i) an inlet and an outlet separated by a flow chamber for the chromium bearing solution, and
- ii) an exchange mass in the flow chamber between the inlet and the outlet, the exchange mass comprising iron fibres;
- b) a first probe disposed proximal the inlet for monitoring a pH of the chromium bearing solution;
- c) a second probe proximal the inlet for monitoring an oxidation/reduction potential of the chromium bearing solution;
- and
- d) a controller assembly operatively connected to the probes receiving the pH and the oxidation/reduction potential of the chromium bearing solution, the controller assembly adjusting the pH and the oxidation/reduction potential of the chromium bearing solution in the exchange mass thereby reducing chromium (VI) ions to chromium (III) and producing a solution substantially free from chromium (VI) and total chromium ions.
Dependencies are inferred from the claim text.