Synthesis and characterization of srfe12o19 derived from iron ore tailings

Saswati Samanta, Diptipriya Sethi, Biswal R, SakthivelR. and AdhikaryM.C.

In this work, we report an experimental study on nano-crystalline SrFe12O19 powder derived from the iron ore tailings. Iron ore tailings is a mineral waste contains 15- 20% Fe2O3 remaining mostly SiO2. Iron from its tailings extracted out in the form of FeCl3 and mixed with appropriated amount of SrCl2. Then the mixed aqueous solution containing FeCl3 and SrCl2 was precipitated with citric acid to form corresponding citrate complex. The formed citrate complex precipitate separated out through filtration, washed, oven dried and finally calcined at 800 oC for 3 hours to obtain SrFe12O19 nano-crystalline powder. The same product was again obtained through Urea hydrolysis. Several advanced techniques have been employed to characterize the prepared SrFe12O19 samples. XRD reveals the formation of SrFe12O19 as major phase and trace amount of Fe2O3 and Strontium oxides were found as minor phases. UV-Visible spectrum of samples shows strong absorbance in the UV and visible region (650 & 500nm). TG curve demonstrates that oven dried sample shows weight loss up to 400 oC indicating for the dehydration followed by decomposition of citrate complex to form metal oxide composite. The FTIR result exhibits the bands for M-O bond (M= Sr, Fe) vibration. VSM curve suggests that SrFe12O19 obtained by co-precipitation method shows more magnetization than the sample prepared by urea hydrolysis method. Thus, the present work showed that iron ore tailings could be used as one of the raw material for synthesis of rare earth ferrite for its potential application in various field.

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