wet process phosphoric acid solution formed from uncalcined phosphate rocks generally contains about 600 grams/liter of H3 PO4, about 0.2 gram/liter of uranium, about 1 gram/liter of calcium, about 9 grams/liter of iron, about 28 grams/liter of sulfate and about 30 grams/liter of fluorine. The phosphoric acid solution also contains varying amounts of arsenic, magnesium, aluminum, and humic acid impurities.
the recovery of uranium from phosphoric acid (IAEA 1989) shoud be useful
http://www-pub.iaea.org/MTCD/publications/PDF/te_0533.pdf
I invite you to read this paper "Solid phase extraction of uranium(VI) on phosphorus-containing polymer grafted 4-aminoantipyrine".
Author Full Names:
Soylak, Mustafa; Khan, Mansoor; Alosmanov, Rasim; Shah, Jasmin; Jan,
Mohammad Rasul
Source:
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, 308 (3):955-963; 10.1007/s10967-015-4508-4 JUN 2016.
ISSN: 0236-5731
Thank you for your very careful review of our paper, and for the ansewers, corrections and suggestions that ensued.
Mr. Abdelkarim,
If this happen, this means that your analytical protocol and calibration relationship do not express the real extraction process. Or your calibration equation does not express the chemical processes in your real system.
The relationship between extraction constant KEx and distribution ratio Dc is given by equation (1) (attachment). Dc depends on enthalpy (DH) according equation (2), while KEx - from the free Gibbs (DG) energy according equation (3).
So, any perturbation in DH/DG leads to perturbation of Dc/KEx. This directly affects the calibration relationship, and thus - the corresponding equation.
DG/DH can be perturbed by:
- perturbation of T
- perturbation of P
- perturbation of ionic strength
- competitive reactions of adsorption/desorption.
- (nano) colloidal particle aggregation
- competitive reactions like formation of new coordination compound by ligand exchange, due to perturbation in the environmental factors; complexation with organic matter and more.
What are the problems caused by uranium extraction from phosphoric acid? process and matriels
Mr. Abdelkarim,
Towards speciation (Analytical chemistry I, materials in your question) your raw materials contain mainly MgO, Al2O3, SiO2, P2O5, CaO, Fe2O3 and U3O8 chemical compositions of the elements.
Towards processes (second part of your question), there are large set chemical reactions as I have pointer out, which are main topics of the following courses in 'Chemistry': 'Analytical chemistry I' (speciation) and 'Analytical chemistry II' (chemical equilibria); 'Physical chemistry I and II' (thermodynamics, equilibria processes); 'Physical chemistry III (`chemical equilibria in colloidal (nano) systems); 'Coordination chemistry' and few more (Generally, BSc in 'Chemistry').
So, if you have basic education in 'Chemistry', this means that you presumably should know the answer to the topic of your question (If the quality of this basic education is good). If you have not basic education in 'Chemistry' (disciplines above), then you need basic education in 'Chemistry'.
As you could expect there is unable to educate via a forum platform, like RG. It is not University.
The rapid increase in uranium oxide (U3O8) prices over the last few years, and the
changing fundamentals in the world’s uranium supply/demand balance have re-kindled
the interest in extraction of uranium from phosphoric acid.
This paper examines different technologies that can be used to extract uranium oxide
(U3O8) from phosphoric acid streams:
o Solvent extraction (SX) techniques modified and updated from those used
in previous SX processes developed in the 1970’s and 1980’s.
o Advanced Technology (AT) techniques that offer simpler processing
techniques, lesser equipment requirements, and lower capital and
operating costs compared with SX.
The paper will briefly describe how each of the processes work, and ascribe comparative
order of magnitude capital and operating costs to each process based on a hypothetical
uranium content in a typical phosphoric acid stream, for a standard size phosphoric acid
unit. Comparative economics will also be developed for each of these cases. Finally, a
recommended test program encompassing all three processes will be recommended for
those who may be interested in pursuing commercial development.
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