Resumo

AMPHLETT, J.T.M.; SHARRAD, C.A.; FOSTER, R.I.  e  OGDEN, M.D.. Ethylenediamine-funtionalized ion exchange resin for uranium recovery from acidic mixed sulphate-chloride media: initial column loading studies. J. S. Afr. Inst. Min. Metall. [online]. 2018, vol.118, n.12, pp.1251-1257. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2018/v118n12a3.

A renewed interest in nuclear power around the world in order to reduce greenhouse gas emissions is going to increase demand for uranium as fuel. This will result in more uranium being mined, which will in turn increase associated environmental pressures, such as fresh water use. A move to lower quality waters containing impurities such as chloride would help alleviate these pressures. In this work, we determined the uptake characteristics of weakly basic anion exchange resin Ps-EDA towards uranium from saline solutions in a dynamic flow column. Breakthrough curves were produced, with suppression of uptake being observed for chloride concentrations above 5 g L-1. Calculated resin saturation capacities at zero and 5 g L^-1 chloride are comparable with literature values for strong-base anion exchange resins, and exceed those published for weak-base resins up to 20 g L^-1 chloride. Data has been fitted to multiple breakthrough models, with the modified dose-response model most effectively predicting uranium recovery. The results show that the ethylenediamine functionality could be suitable for use in future uranium processing flow sheets where a high-saline lixiviant is used.

Palavras-chave : uranium; ion exchange; chloride media; water quality.

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