Electronic Theses and Dissertation

The production of local mineral in Indonesia is untill now still limited. Actually, the potential and deposite are rich and spread in many place, but the process from raw material to pig iron product is not optimal yet. The iron sands is one of local mineral that could be obtained for increasing added value. Motivated by this, in this work, the manufacture of iron sand was done using direct reduction technique by compact coals as reductor. The carbon compound of coals were using for releasing oxide in magnetite compounds (Fe3O4) of iron sand, so it could be transformed to Fe phase. The Iron sand was milled using Planetary Ball Mill (Fritsch, P6) for 0, 10, 20, and 40 hours. Then the iron sands samples were mixed with coals and bentonite and compacted using hydrolic press at 8 ton pressure. Samples were loaded into furnace and sintered 900 oC temperature. As the results, it was identified (using XRF) that the major phase was 75,40% of Fe2O3. Consistent with XRF results, the phase composition observation by using XRD was shown that the major phase of sample was Fe2O3 (hematite). Mechanical alloying technique was also shown that the crystallite size of the sample was around 34 nm, as calcultaed using Scherrer formula. In this sample, Fe phase has been formed at 2?= 44,4334 o, d= 2,03771 ?, as it was shown at crystal field (1 1 0) as Fe phase. The morfology structure was refered using SEM showed that homogen orientation. The magnetic behavior investigation was showed that the decreasing in magnetic saturation value (Ms) and remanent (Br) and followed by increasing the coercivity value (Hc). Such beach sands pellet is suitable for soft magnetic applications.

Keywords : Iron Sand Pellet, Direct Reduction, Mechanical Alloying, XRD dan analysis XRF Analysis, magnetic properties.

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