SYNTHESIS AND CHARACTERIZATION OF HEMATITE (Fe2O3) OF IRON ORE AND MAGNETITE (Fe3O4) FROM IRON SAND THROUGH PRECIPITATION METHOD FOR INDUSTRIAL RAW MATERIALS

Abstract

Indonesia is a country that has enormous iron ore and iron sand mine that can be utilized for various industrial purposes. This research has been successfully conducted synthesis and characterization of hematite iron ore and magnetite from iron sand. Iron sand and iron ore that has been crushed manually repaired with a magnet was carried out with the HCl, and NH₄OH then dried in the temperature of 150 ^oC and calcinated at a temperature of 500 ^oC. Characterization was carried out using X-ray diffraction (XRD) and X-ray fluorescence (XRF), where the preliminary information obtained from XRF results in an iron ore sample by manual separation have 95.99% of Fe₂O₃ and followed by compounds SiO₂ (2.10%). While the iron sand contains 81.42% of Fe₃O₄ and 2.5% of SiO₂. After the precipitation process, Fe₂O₃ compounds contained in iron ore has a content of 96.58% and Fe₃O₄ compounds contained in iron sand (86.73%).  The results of XRD indicate the dominant primary phase in iron ore is hematite or Fe₂O_3, and in iron, sand is magnetite Fe₃O₄, Before the extraction process, Fe₂O₃ was 58.009 μm in size and after the process of extracting the particles was reduced to 20.950 μm. While the Fe₃O₄, prior to the extract, has a grain size of 59.009 μm, and after an extraction process, the grain size reduced into 25.950 μm. The calculation results indicate there is a slight size difference between the grain size of iron sand and iron ore.