METHOD OF PLATINUM GROUP METALS EXTRACTING FROM VOLOXIDIZED SNF ACID DISSOLVING PRODUCT Russian patent published in 2017 - IPC G21C19/42 

FIELD: fuel.

SUBSTANCE: invention relates to spent nuclear fuel (SNF) processing. Method of platinum group metals extracting from product of voloxidized SNF acid dissolving involves, that obtained after voloxidiation SNF is dissolved in nitric acid in the range of temperatures of 83–86 °C for 4–5 hours to obtain residual nitric acid content in product in range of 1.42–2.3 mol/l,uranium in range of 480–600 g/l, obtained product is thermostated in range of temperatures of 69–80°C for 2–48 hours, adding flocculant and dispersing reaction mixture, performing sediment accumulation in device bottom part by sedimentation deposition in range of temperatures of 35–57 °C for 6–24 hours. Product clarified part is separated by decantation, averaging sedimented deposit in remaining clarified solution amount in device.

EFFECT: invention enables to extract into deposit of more 78,7 % of platinoids and separate 98,1 % of suspensions formed during SNF dissolving.

15 cl, 2 ex