CHOICE AND DEVELOPMENT OF AN EASILY-PROCESSED ELECTROLYTE FOR DECONTAMINATION BY ELECTROPOLISHING
Project ID: FI1D0004Funded under: FP1-DECOM 2C
In the R&D project under consideration, an easily processed electrolyte based on organic substances was developed, with this alternative electrolyte supposed to replace the usual inorganic electrolytes (phosphoric acid and/or a mixture of phosphoric/sulphuric acid) used so far for decontamination by electropolishing. Three different organic electrolytes, formic acid (E 1), oxalic acid (E 2) and acetylacetone (E 3), using potassium bromide (KBr) as the auxiliary electrolyte, were tested in the laboratory for their suitability when used for electrochemically dissolving steel and stainless steel. The best results in the preliminary test series were attained with acetylacetone. This electrolyte ranks among the best as far as the current efficiency is concerned, with the produced acetylacetonates having the lowest solubility and thus settling out of the solution in the form of coarse crystalline products. Tests were carried out on radioactive reactor components using acetylacetone in a 400 A test facility. This was intended to verify and optimise the decontamination factors, the electrolyte service life and the produced waste volume, as well as the respective process parameters. A gamma-spectrometric evaluation revealed that the activity contained in the settled-out metallic acetylacetonate is five times higher than that in the electrolyte. It is only necessary to refill the spent acetylacetonate which then makes it possible to continue using the electrolyte solution almost without restriction.
Bibliographic Reference: EUR 12383 DE (1989), 55 PP., FS, ECU 6.25 ISBN 92-826-0903-0 THE OFFICE FOR OFFICIAL PUBLICATIONS OF THE EUROPEAN COMMUNITIES, L-2985 LUXEMBOURG
Availability: Can be ordered online
Record Number: 1989128058400 / Last updated on: 1990-11-09
Available languages: de