REMOVAL OF CHLORIDE FROM NITRIC ACID BY OXIDATION WITH PERMANGANATE
Nitric acid is commonly recovered from uranium refinery raffinates by distillation and subsequent rectification. The presence of chloride in these raffinates presents a serious corrosion problem during nitric acid recovery because of the considerable build-up of this ion during the rectification step and its corrosive effect on stainless steel process equipment. Laboratory investigation of this problem resulted in a method of control whereby chloride can be removed by oxidation to chlorine with potassium permanganate. Studies included the effect of temperature, hydrogen ion concentration, air sparge rate, stainless steel surface, and tri-n-butyl phosphate on the reaction of permanganate with chloride in nitric acid solutions. The use of NaNO/sub 2/ following treatment with permanganate was recommended to dissolve MnO/sub 2/ formed by side reactions and to reduce excess permanganate, eliminating the need for filtration of the treated acid. (auth)
- Research Organization:
- Mallinckrodt Chemical Works. Uranium Div., Weldon Spring, Mo.
- NSA Number:
- NSA-14-002460
- OSTI ID:
- 4231097
- Report Number(s):
- MCW-1436
- Country of Publication:
- United States
- Language:
- English
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