914 tons of contaminated metal of the SCK-CEN can be decontaminated using electrochemical techniques. This can reslut in a cost reduction of 300 MBEF.
The metal pieces can be decontaminated by removing te crud covering its surfaces, using osidising agents such as Ce(IV), in a H2SO4-solution. Storage costs are substantially cut by removing the H2SO4 from the contaminated solutions prior to neutralisation. Two electro membrane techniques are espcially useful for acid removl: ED (electrodialysis) and EED (electro electrodialysis). In this report the more recently developed EED will be investigated in order for us to be able to compare the technique to ED in a second report. In this report a number of problems are discussed, such as the choice of the membrane, the electrodes. The cell structure an dthe temperature of the solutions, the number of problems arde discussed, such as the choice of the membrane, the electrodes, the cell structure, an the temperature of the solutions, the determination of maximum cell voltage, the optimal current densities, the maximum concentrations of metal salts, the maximum pH value, etc. As a result of this study, we are now able to use EED to remove virtually aal H2SO4 out of simulated waste solutions originating from the cerium proces. The resulting H2SO4-recuperates promise to be of high purity and few maintance operations are to be expected.
|State||Published - 1997|
|Publisher||Studiecentrum voor Kernenergie|