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Recovery of major components of spent zinc electrolyte with di(2-ethylhexyl)phosphoric acid (DEHPA) used as a zinc(II) extractant

Gotfryd L., Pietek G., Szołomicki Z., Becker K.

Physicochemical Problems of Mineral Processing

2014

Vol. 50, iss. 1

311--325

Industrial acidic zinc electrolyte has been treated with calcium compounds and/or concentrated ammonia solution and resulting crystalline phases as well as equilibrium mother liquors were analyzed in detail for dependence on preliminary dilution of electrolyte with water. Neutralized zinc electrolyte was an object of investigation in zinc(II) extraction with di(2-ethylhexyl)phosphoric acid (DEHPA) as an extractant. Dependencies of zinc(II) and contaminants extraction on equilibrium pH, isotherms of zinc(II) extraction and stripping have been studied. During simulated laboratory counter-current trial of zinc extraction a new zinc electrolyte (stripped solution) has been produced. Raffinates left after the process were purified and qualified as mineral magnesium-ammonium fertilizer solutions.

Extraction of zinc(II) from contaminated its sulphate and chloride solutions

Gotfryd L., Szymanowski J.

Polish Journal of Chemical Technology

2004

Vol. 6, nr 2

14-18

A full sequence of investigations was performed with a purpose to develop adequate extraction technologies for the purification of a few typical industrial, both sulphate and chloride, heavily contaminated zinc(II) solutions. These covered: i) independent measurements of individual cation extraction versus pH and extraction isotherms with commercially available extractants, ii) the design of individual extraction systems for the chosen extractants, iii) the counter-current batch-wise full process imitations in a laboratory glass with the use of di(2-ethylhexyl)phosphoric acid (DEHPA) and di(2,4,4-trimethylpentyl)phosphinic acid (Cyanex 272), iv) pilot trial with the use of DEHPA, executed on train of mixer-settler type extractors, working continuously.

Recovery of zinc(II) from acidic sulfate solutions. Simulation of counter-current extraction-stripping process

Gotfryd L., Szymanowski J.

Physicochemical Problems of Mineral Processing

2004

Vol. 38

113-120

Cyanex 272 and di(2-ethylhexyl)phosphoric acid (DEHPA) were used for extraction of zinc(II) from sulphate solutions. Counter-current extraction-stripping process was simulated. The simulation enabled CYANEX 272 to be selected for the recovery of zinc(II) from acidic sulphate solutions. A higher selectivity of zinc(II) extraction was the main benefit of using CYANEX 272. Technologically significant conclusions could be arrived at only when process solutions with metal contaminants were used for the studies and several extraction-washing-stripping cycles were carried out. The studies of individual extraction and/or stripping using model solutions could be only considered as an initial step and were of a limited technological value.

Cyanex 272 oraz kwas di(2-etyloheksylo)fosforowy (DEHPA) zastosowano do ekstrakcji cynku(II) z procesowych roztworów siarczanowych zawierających dodatkowo Cu(II), Cd(II), Na(I), K(I), Mg(II), Ca(II) i As(V). Symulowano przeciwprądowy proces ekstrakcyjno-reekstrakcyjny. Symulacja pozwoliła wytypować Cyanex 272 jako odpowiedni ekstrahent do selektywnej ekstrakcji cynku(II) wobec występujących zanieczyszczeń. Tylko zastosowanie prawdziwych roztworów technologicznych i prowadzenie pełnego cyklu ekstrakcji - przemywania i reekstrakcji umożliwia wyprowadzenie technologicznie rozsądnych wniosków. Badanie indywidualnego etapu ekstrakcji lub reekstrakcji posiada ograniczone technologiczne znaczenie.