| abstract |
A process for leaching uranium from a refractory uraniferous mineral including the step of treating a slurry containing said uraniferous mineral and ferrous ions in a reactor with an acid and an oxidant to increase the ORP in the reactor to a value of at least 550m V vs Ag/Ag Cl reference electrode in order to oxidise the ferrous ions to ferric ions, which are used to oxidise said refractory uraniferous mineral and contribute to leaching of uranium from said uraniferous mineral,wherein the slurry has an elevated total dissolved iron content. |