"Unwanted impurities, present in raw materials, are often coextracted along with desired constituents during leaching. If left unchecked, impurity levels may increase in hydrometallurgical process streams until their presence has deleterious effects upon subsequent unit processes. Due to its abundance and ease of extraction, the presence of ferric iron in solvent extraction circuits has always been a problem. The technique proposed herein constitutes a novel approach to remove iron from zinc hydrometallurgical circuits; but the principles employed may find a variety of applications.
This research investigated the reduction and stripping of ferric iron from di(2-ethylhexyl) phosphoric acid into a low sulfuric acid concentration strip solution. The strip was accomplished under nitrogen at atmospheric pressure and temperatures ranging from 30 to 50°c using metallic zinc as the reductant. The effects of organic zinc and iron loading, solvent concentration, zinc metal surface area, and acid concentration of the strip solution were examined.
Iron loading of the organic, temperature, and zinc metal surface area were found to be the major factors influencing the removal of iron. Reduction in the organic followed by stripping revealed that the reduction of ferric iron to ferrous appears to be the rate determining step"--Abstract, page iii.
Watson, John L.
O'Keefe, T. J. (Thomas J.)
Hagni, Richard D.
Materials Science and Engineering
M.S. in Metallurgical Engineering
University of Missouri--Rolla
viii, 81 pages
© 1988 Byron George Belew, All rights reserved.
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Belew, Byron G., "Reductive stripping of iron(III) from di(2-ethylhexyl) phosphoric acid" (1988). Masters Theses. 769.
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