By E. R. Merz (auth.), L. Cecille, S. Halaszovich (eds.)
The function of the Seminar was once to supply a world interdisciplinary discussion board for in-depth discussions at the execs and cons of a denitration step by way of chemical skill during solidification of MAW (medium lively waste) and HAW (highly energetic waste), sooner than feeding the calciner or melter. specifically, variations within the volatility of a few parts and aerosol formation in the course of the vitrification step are of curiosity. Chemical instead of thermal denitration could have specific advantages which can simplify off-gas purification. a discount within the salt burden of waste ideas, resulting in a discount within the quantity of reliable waste, can also be accomplished. The medical programme of the Seminar consisted of invited lectures merely, given by means of specialists actively engaged during this box of study. The emphasis was once on wide discussions one of the contributors, with the purpose of resulting in an target figuring out of the state of the art. The assembly additionally indentified matters and recommendations for destiny research.
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Extra resources for Denitration of Radioactive Liquid Waste
If the velocity of sound is obtained at this point the 52 mass flux of gas or vapor cannot be increased beyond a critical value GC' This value is related to the gas properties inside the vessel as Gc = P a (__2__ )y/y-l o 0 y+l with Po - density, a O - sonic velocity, and y - polytropic exponent of the gas. From this relation a critical volumetric flow-rate can be derived if the dependence of the gas density and of the sonic velocity on the pressure and the temperature is inserted. Thus, a pressure of 3 bar is predicted if the gas flow-rate should exceed 3000 tIs (normalized to 1 bar and 20·C).
KELM, M. D. (1979). Reaction Model for Denitration with Formic Acid of Waste Effluents from Nuclear Fuel Reprocessing Plants, Ger. Chem. Eng. , KELM, M. D. (1983). Auftreten von Oszi11ationen bei der Denitrierung von sa1petersauren schwer- und ede1meta11ha1tigen Losungen, Chem. Ing. Techn. B. (1980). Critical Two-Phase Flow, Int. J. , BAHR, W. (1985). S. (1960). Decomposition of Tributy1 Phosphate Complexes, DP-526  HOLZE, K. (1981).
1 mole/I. 32 The mos t interes ting methods for deni tra tion are those producing gaseous products without increase of the salt concentration in the solution. The reaction products shall not be explosive or inflammable, and, if possible, not toxic so that they can be released to the environment without further processing. This goal can be partly reached by the reaction of nitric acid with organic compounds. Several of these compounds are known which reduce nitric acid to nitrous oxides. During this process the reductants are oxidized to carbon monoxide or dioxide.