"Solvent extraction has been proposed as a method to selectively remove iron impurities from hydrometallurgical process streams, but difficulties are encountered during stripping of the ferric ion from organic reagents such as D2EHPA. Galvanic stripping is a novel alternative process currently being developed that uses a solid metal to directly reduce iron in the organic to the ferrous state. Stripping of the iron in this form is then relatively easy and circumvents the problem.
Research designed to develop flow sheets, which incorporate simultaneous and separate galvanic stripping for the selective removal of iron from a solvent extraction stream is presented. A primary objective of the study was to obtain the iron in a useful form. The effect of various operating parameters, including metal reductant, temperature, oxygen and water contents, and stripping solution composition on iron removal from D2EHPA is shown and discussed. Preliminary test results of the process using a synthetic leach were extremely promising.
Further laboratory investigations were conducted to optimize separate galvanic stripping for iron removal from 10%v and 30%v D2EHPA using zinc and iron as the reducing agents. In 10%v D2EHPA, it is shown that a critical amount of water and an optimal level of oxygen are needed for reduction of ferric ions to occur with specific amounts being dependent on other operating parameters. In 30%v D2EHPA, iron loading, temperature, time, and water and oxygen contents are all shown to affect the kinetics of the reaction. The possibility of using zinc or iron is demonstrated, with 90% removal of the loaded ferric ions being attained when separate galvanic stripping is used"--Abstract, page iv.
O'Keefe, T. J. (Thomas J.)
Watson, John L.
Collier, Harvest L.
Materials Science and Engineering
M.S. in Metallurgical Engineering
University of Missouri--Rolla
Journal article titles appearing in thesis/dissertation
- Recovery of zinc from residues by SX-galvanic stripping process
- Optimization of ferric reduction in di-ethylhexyl phosphoric acid by separate galvanic stripping
xiii, 63 pages
© 1995 Michael Scott Moats, All rights reserved.
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Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://laurel.lso.missouri.edu/record=b2715599~S5
Moats, Michael S., "Reduction of iron(III) in di-(ethylhexyl) phosphoric acid using solid metal reductants" (1995). Masters Theses. 1496.
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