Recovery of zinc from arduous wastes using solvent extraction technique. Part II. Pilot plant tests
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Institute of Non-Ferrous Metals
Publication date: 2011-06-01
Corresponding author
Leszek Gotfryd   

Institute of Non-Ferrous Metals, Sowińskiego 5; 44-100 Gliwice, Poland
Physicochem. Probl. Miner. Process. 2011;47(1):249-258
Solvent extraction technique using 40 vol. % bis(2-ethylhexyl)phosphoric acid as an extractant was applied for recovery of zinc from technological solutions. Crude zinc oxides from Waelz processing of electric arc furnace dusts or ferrous waste of zinc hydrometallurgy were used for preparation of feed solutions by leaching them with diluted sulfuric acid and by pre-liminary hydrometallurgical purification. The studies were conducted step by step from labor-atory to advanced pilot plant tests in continuously operating installation. Part II describes preparations and results of pilot plant counter-current experiments performed using laboratory extractive system, built from a train of mixer-settler type extractors, set in changeable counter- current manner, necessary pumps and automation systems, coupling pH measurements with neutralization agent supply. Excellent results in a form of very pure zinc sulfate solutions were obtained. ZnSO4 concentrations are appropriate and the purity of the strip solutions very good. Comparison of natural and accelerated method of zinc extraction is done.
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