Abstract
Preparation of spinel ferrites using limonite laterite ore as raw materials was proposed. The effect of Zn substitution on the structure, magnetic properties of as-prepared spinel ferrites were systematically characterized and discussed. The results show that single-phase spinel ferrite was directly synthesized from the precursor solution with the leaching temperature and leaching acid concentration of 200 °C and 2.25 mol·L−1, respectively, and after calcination at 1000 °C for 2 h. Moreover, single-phase of spinel ferrites with different Zn substitution contents (x = 0.00, 0.05, 0.23, 0.35, 0.47, 0.58) could be also obtained. All the lattice constant (a), average grain sizes (d) and X-ray density (Dx) increase with increasing Zn substitution content. With Zn substitution content increasing from 0.00 to 0.58, the saturation magnetization (Ms) value increased from 34.0 to 65.9 emu·g−1 for x = 0.35, and then decreased to 50.7 emu·g−1 while the coercivity (Hc) value decreased from 50 Oe to 14 Oe. This paper provides a pathway for comprehensive utilization of limonite laterite ore and synthesis of spinel ferrites with excellent magnetic performance.
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