Ultrasound-assisted extraction of magnetic material from natural iron sand

Abstract

Iron sand is an abundant source of magnetic material found in the coast of Indonesia. Extraction of magnetic material from iron sand was carried out using NaOH to produce a greener ultrasonic process. The optimum conditions for treatment of iron sand were obtained at 20 minutes, NaOH 4 M and at 60 °C with content of Fe203 of 77.19% and Si02 of 6.49%. The FTIR spectra of magnetic material extracted with ultrasonic assistance showed an increase in absorption intensity at 580 cm-1 which was Fe-O bending vibration and a decrease in intensity at 1047-1056 cm"1 which was asymmetric stretching vibration of Si-O-Si. XRD data showed a sharp peak at 29 35.569-35.596 which was the spinel phase of Fe304 crystals. Magnetite from iron sand belongs to the class of sof t magnets shown from VSM data