Recovery of major components of spent zinc electrolyte with Di(2-Ethlhexyl)Phosphoric acid (depha) used as a Zinc(II) extractant
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Institute of Non-Ferrous Metals
Leszek Gotfryd   

Institute of Non-Ferrous Metals, Sowińskiego 5; 44-100 Gliwice, Poland
Publication date: 2014-01-01
Physicochem. Probl. Miner. Process. 2014;50(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.