In situ synthesis of high density magnetic ferrite spinel (MgFe2O4) compacts using a mixture of conventional raw materials and waste iron oxide

A mixture of magnesite ore and waste iron oxide (mill scale) was used to synthesize high density magnesium ferrite compacts. The effect of different mixture composition (weight percentage of magnesite ore to mill scale) as well as the sintering temperatures on the phase change, compressive strength, physical and magnetic properties of sintered compacts was investigated. The results indicated that a single phase ferrite spinel is obtained in a compact produced from a mixture consisting of 40 wt% magnesite ore and 60 wt% mill scale and sintered at different temperatures. On the other hand, this mixture composition produced compacts possessing low porosity and high saturation magnetization of 6% and 31.89 emu/g, respectively when it is sintered at 1550 °C for 2 h.