Electrical removal of chromium from chlorate solutions
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United States of America Patent
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May 30, 1989
Issued Date -
N/A
app pub date -
Feb 1, 1988
filing date -
Oct 29, 1986
priority date (Note) -
Expired
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Abstract
Dichromate values, or other soluble hexavalent chromium values, are removed from cell liquor or other aqueous media containing the same by cathodically reducing the same to trivalent chromium, which deposits on the cathode as chromium hydroxide. The cathode has a high surface area three-dimensional structure which exposes the electrolyte to electrolysis for a relatively long period of time. An electrode potential of about 0 volts vs. SCE is applied to the cathode. Once the electroconductive sites on the cathode become exhausted, the cathode is regenerated chemically or electrochemically for reuse in further dichromate removal.
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