Cyclochrome—The Recycle of Sodium Dichromate in Sodium Chlorate Manufacture
- Dr. R. E. Alford
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Sodium dichromate is used in the electrochemical manufacture of sodium chlorate to both buffer the electrolyte and to minimize undesirable cathodic reactions.
Increasing quantities of chlorine dioxide are being produced from chlorate solutions as the use of environmentally undesirable chlorine is reduced in pulp mill bleaching operations. Such processes result in the contamination of mill effluents with chromium species which cause environmental concerns.
Several processes are known for dichromate removal, but they are expensive to operate. This paper will discuss a process utilizing ammonia and sodium hypochlorite, both generally available at sodium chlorate producing plants, to recover dichromate at a reagent cost less than the value of the recovered dichromate.
- Hisinger & Berzelius, Neuses. Alg, J. Chem., I 115–149
- British Patent 13,785 (1851)
- Lindbergh & Simonsson Dept. of Applied Electrochemistry, Stockholm
- U.S. Patent 3843759
- U.S. Patent 4268486, Canadian Patent 1139090
- German Patent 3032131
- U.S. Patent 4259297
- U.S. Patent 4699701
- U.S. Patent 3835001
- Cyclochrome—The Recycle of Sodium Dichromate in Sodium Chlorate Manufacture
- Book Title
- Modern Chlor-Alkali Technology
- Book Subtitle
- Volume 5
- pp 43-57
- Print ISBN
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- Springer Netherlands
- Copyright Holder
- Springer Science+Business Media B.V.
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