Optimization of the solvent extraction of zinc, copper and nickel from acidic leaching: Process steps and thermodynamic investigation
Subject Areas :Somayeh Kolbadinejad 1 , Ahad Ghaemi 2
1 - Iran university of Science and technology
2 -
Keywords: : Solvent extraction, Heavy metals, D2EHPA, Mextral 5640H, Thermodynamic modeling, Determination of process steps.,
Abstract :
: In this study, optimization of the solvent extraction of zinc, copper and nickel from the acid leaching was carried out. Three steps were considered for the selective extraction of metals from the acid leaching solution. In the first step of the solvent extraction, 93.67% of zinc was extracted from the leaching solution with pH equal to 4 using 20% of D2EHPA in kerosene. In the second step of the solvent extraction, 100% of copper was extracted from the first step raffinate with pH equal to 2.3 using 10% of Mextral 5640H in kerosene. In the third step of the solvent extraction process, 88.61% of nickel was extracted from the second step raffinate with pH equal to 7 using 20% of D2EHPA in kerosene. The stirring speed was 200 rpm and the ambient temperature was kept constant for all solvent extraction experiments. Atomic absorption spectroscopy was used to determine the amount of the metals in the extractant and raffinate. All three steps of the extraction process were performed endothermic and spontaneously.
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