Abstract
In a previous paper, a kinetic study of the precipitation stripping of yttrium oxalate powders from yttrium-loaded HDEHP solution was conducted using a Lewis-type cell. The variation in yttrium content in organic phase versus time with a constant liquid-liquid interfacial area allowed the determination of the initial precipitation stripping rate. The work reported here has used these experimental results and observations to investigate mechanisms for the precipitation of YH(C 2O 4) 2 · 3H 2O(s) and Y 2(C 2O 4) 3 · 10H 2O(s) salts. The precipitation of the acid salt is assumed to be based on a fast nucleation step followed by a continuous growth process. The rate-controlling step is the displacement of organic dimers H 2L 2 from the intermediate complex Y(HL 2) 2 + adsorbed onto a free site of the salt located at the liquid-liquid interface by oxalic acid. The precipitation of the neutral salt can be analysed by a model based on nucleation and agglomeration, assuming that there is negligible growth. In the mechanism considered the rate-controlling step is the first step of the stripping reaction of yttrium.
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