EP 0224510 B1 19910116 - PROCESS FOR DECONTAMINATING RADIOACTIVELY CONTAMINATED METALIC OR CEMENT-CONTAINING MATERIALS
Title (en)
PROCESS FOR DECONTAMINATING RADIOACTIVELY CONTAMINATED METALIC OR CEMENT-CONTAINING MATERIALS
Publication
Application
Priority
- CH 223885 A 19850528
- CH 223985 A 19850528
- CH 232885 A 19850603
Abstract (en)
[origin: WO8607184A1] The contaminated surface layers of a material are decontaminated by treatment with an aqueous decontamination fluorine-based solution containing from 0.05 to 50 moles of decontamination agent per litre, the decontamination agent being preferably a substance selected from the group comprising hexafluorosilicate acid, fluoroboric acid and salts thereof. The decontamination solution has a very high efficiency which is particularly necessary for pressure water reactors, boiling water reactors, high temperature alloys and masonry works. The decontamination agent (HBF4 acid) is appropriately produced by using fluoric acid or hydrogen fluoride and from contaminated boric acid from pressure water reactor waste. The HBF4 acid thus obtained is separated from contaminants and other impurities by distillation. The spent decontamination solution may be recycled in the decontamination process after regeneration.
IPC 1-7
IPC 8 full level
G21F 9/00 (2006.01)
CPC (source: EP US)
G21F 9/002 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE FR GB LI SE
DOCDB simple family (publication)
WO 8607184 A1 19861204; DE 3676962 D1 19910221; EP 0224510 A1 19870610; EP 0224510 B1 19910116; US 4828759 A 19890509; US 4933113 A 19900612; US 5008044 A 19910416
DOCDB simple family (application)
CH 8600069 W 19860527; DE 3676962 T 19860527; EP 86903176 A 19860527; US 1979987 A 19870128; US 34928489 A 19890509; US 34958689 A 19890509