Deutsche Gesellschaft Fur Wiederaufarbeitung Von Kernbrennstoffen Mbh

Wiederaufarbeitungsanlage Karlsruhe Betriebsgesellschaft Mbh

Heinz Evers

Klaus Eiben

The invention is directed to an apparatus for washing a solvent in the recessing of irradiated nuclear fuel. The solvent is washed with an aqueous solution in a mixer-settler having at least one stage which includes a mixing chamber and a settling chamber. The pH is measured by a sensor adjacent stirring means in the mixing chamber and is coupled to a controller controlling metering of the washing solution. The pH of the dispersion in the mixing chamber is measured and an amount of washing solution is added which influences the pH toward the desired operational value. Various recycling means and weir overflow means also influence pH control and the washing operation.

Apparatus for washing a solvent in the reprocessing of irradiated

The invention is directed to a method of washing a solvent in the reprocessing of irradiated nuclear fuel. The solvent is washed with an aqueous solution in a mixer-settler having at least one stage which includes a mixing chamber and a settling chamber. The pH of the dispersion in the mixing chamber is measured and an amount of washing solution is added which influences the pH toward the desired operational value. An apparatus for carrying out the method is also disclosed.

Method of washing a solvent in the reprocessing of irradiated nuclear

The invention is directed to a multi-stage mixer-settler for use in the lid-liquid countercurrent extraction process with tubular stages disposed at a distance from and parallel with one another in a horizontal plane with each stage including a settling chamber. A vertically mounted rotatable agitator is provided in the mixing chamber. In order to be able to use the tubular mixer-settler also for the separation of substances of value, a housing of the tubular mixer-settler is connected to act as a cathode and anodes are disposed in the settling chamber.

Electrolytic tubular mixer-settler

A multi-stage tubular mixer-settler for use in liquid-liquid countercurrent extraction includes lengths of tubing disposed in a horizontal plane parallel with and spaced alongside and apart from one another. The lengths of tube each include a settling chamber. The mixing chambers associated with the settling chambers are in each length of tube and are provided with a rotary agitator disposed vertically in the mixing chamber. In order to require a smaller quantity of washing phase flow during extraction and to achieve a high throughput for satisfactory hydraulic conditions in the extractor, each mixing chamber is likewise configured as a horizontal portion of tube fitted flush with the settling chamber. The feeds of the two phases to be blended discharge into the free end face of each mixing chamber. Mixing and settling chambers are in each length of tube and are isolated from each other by a vertical partition wall provided with an aperture in the region of the interface between the phases. A conduit connects the mixing chamber to the settling chamber so that one phase can be fed back from the settling chamber to the mixing chamber. The mixing agitator effects the return by drawing the phase which is to be recycled through the conduit.

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Busenberg, Germany

Heinz Evers