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REFERENCE FITTING FOR DETOXIFICATION AV NO- OCH / ELLER NO2-HALTIG AVFALLSVATTEN OCH AVLOPPSGASER MED KROM (VI) -HALTIGA AVFALLSVATTEN ELLER LOESNINGAR
REFERENCE FITTING FOR DETOXIFICATION AV NO- OCH / ELLER NO2-HALTIG AVFALLSVATTEN OCH AVLOPPSGASER MED KROM (VI) -HALTIGA AVFALLSVATTEN ELLER LOESNINGAR
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机译:用铬(VI)覆盖的废水或溶液对含NO和/或NO2的废水和污水进行解毒的参考装配件
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摘要
This invention provides a process for detoxifying or decontaminating liquid effluents and/or waste gas containing poisonous chromium (VI) NOx by reacting these with each other with formation of chromium (III) and higher oxide(s) of N. Optionally in addition another suitable reducing agent may be used. The process is particularly useful, for example, in a plant such as a stainless steel pickling plant where both these chemical components are available. Preferably liquid-liquid extraction may be used to extract and recover nitric acid formed as an oxidation product and preferably if additional chromium (VI) is required, this may be provided by electrolytic oxidation of chromium (III) to chromium (VI) in a suitable chemical circuit.
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