Patent ID: 8628733

Claim:
Method for producing a uranium concentrate in the form of solid particles, by precipitation from a uranium-containing solution using a precipitating agent, in a vertical reactor comprising a base, a top, a central part, an upper part, and a lower part, the solid particles of the uranium concentrate forming a fluidized bed under the action of a rising liquid current which circulates from the base towards the top of the reactor successively passing through the lower part, the central part and the upper part of the reactor, and which is created by introducing a liquid recycling current flow at the base of the reactor, said liquid recycling current flow being tapped at a first level (A) in the upper part of the reactor and sent back without settling to the base of the reactor, excess liquid being further evacuated via an overflow located at a second level (B) in the upper part of the reactor; wherein the upper limit (C) of the fluidized bed of solid particles is controlled so that said upper limit (C) is positioned at a level below the first level and the second level.