Enhanced Extraction of Indium from Zinc Indium Ferrite by Applying a Combination of Ultrasound and Microwave
Alkali leaching of indium from zinc indium ferrite(ZnFe2-xInxO4)was strengthened by applying a combination of ultrasound and microwave.The results show that there are not a great amount of solid solution of indium in the octahedral lattice of ZnFe2-xInxO4,and the maximum solid solution approaches 4.0%in a mass fraction(x=0.088).The leaching rate of indium can be enhanced by the external fields in the following descending order:a combined application of ultrasound and microwave,single application of microwave,application of ultrasound followed by microwave or microwave followed by ultrasound,and single application of ultrasound.It is shown that the leaching rate of indium can be up to 56.6%with a combined application of ultrasound and microwave,but only reach 30.2%by singly applying ultrasound.During the alkaline leaching under the external fields,In3+can be released from the lattice,while the octahedral lattice of zinc ferrite will not collapse.With a combined application of ultrasound and microwave,more In3+can be released,leading to lattice constant becoming much smaller.The XRD spectrum shows obvious reduced intensity and rightward movement of diffraction peaks.
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