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8. Influence of Fe Content on Lattice, Structural and Magnetic Analyses of BaFe2+2Fe3+16-xO27± Hexaferrites Prepared by Facile Ceramic Route Methodology.

Author

Tang, Jin, Li, Dan, Li, Yimin, Liu, Chen, and Zeng, Jishu

Subjects
MAGNETIC particles, POWDERS, CERAMICS, SCANNING electron microscopy, REMANENCE, TEMPERATURE control, CERAMIC powders, MAGNETS
Abstract

Fe2W-type ferrite BaFe2+2Fe3+16-xO27± (x =−0.8, −0.4, 0.0, 0.4, 0.8, 1.2) fine powders and magnets were synthesized by a facile ceramic route. The lattice and microstructure of the fine powders were studied by x-ray diffraction (XRD). The results show that a single magnetoplumbite structure is obtained under the condition of Fe change (x =−0.8, −0.4, 0.0, 0.4, 0.8, 1.2). The morphology of the sintered magnet was studied by scanning electron microscopy (SEM). The influence of iron content on the magnetic characteristics of BaFe2+2Fe3+16-xO27± was systematically studied by controlling the pre-sintering temperature of 1300°C. The change in the remanence (Br) of BaFe22+Fe16-x3+O27± magnets with different iron content first increased and then decreased, which confirmed that the change trend of the Br was consistent with the variation in the saturation magnetization (Ms). Meanwhile, the coercivity (Hcj) and (Hcb) of the magnets was consistent with the change characteristics of the coercive force (Hc) of magnetic powder. At iron change (x) = −0.4, Ms, Br, Hc, Hcj, Hcb, and maximum energy product ((BH)max) reach maximum. [ABSTRACT FROM AUTHOR]

Published
2022
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10. Effect of oleic acid on gibbsite precipitation from seeded sodium aluminate liquors.

Author

Yin Zhoulan, Chen Qiyuan., Zeng Jishu, Yin Zhoulan, Chen Qiyuan., and Zeng Jishu

Abstract

The effect of oleic acid on gibbsite precipitation ratio, agglomeration and morphology was studied at 65 and 75 degrees C in order to evaluate the role of this collector in the ore dressing-Bayer process. Titrimetric analyses showed that oleic acid inhibited the precipitation of gibbsite from seeded sodium aluminate liquors with the inhibitory effect being stronger at 65 degrees C. Particle size distribution measurements indicated that the agglomeration of gibbsite was markedly enhanced at low oleic acid concentrations (0.01-0.05 g/l), whereas concentrations of oleic acid in excess of 0.1 g/l suppressed agglomeration. Scanning electron microscopy demonstrated that low concentrations of oleic acid in the sodium aluminate liquors gave rise to the formation of compact gibbsite particles, whereas high concentrations of oleic acid favoured the growth of smooth texture of gibbsite surfaces., The effect of oleic acid on gibbsite precipitation ratio, agglomeration and morphology was studied at 65 and 75 degrees C in order to evaluate the role of this collector in the ore dressing-Bayer process. Titrimetric analyses showed that oleic acid inhibited the precipitation of gibbsite from seeded sodium aluminate liquors with the inhibitory effect being stronger at 65 degrees C. Particle size distribution measurements indicated that the agglomeration of gibbsite was markedly enhanced at low oleic acid concentrations (0.01-0.05 g/l), whereas concentrations of oleic acid in excess of 0.1 g/l suppressed agglomeration. Scanning electron microscopy demonstrated that low concentrations of oleic acid in the sodium aluminate liquors gave rise to the formation of compact gibbsite particles, whereas high concentrations of oleic acid favoured the growth of smooth texture of gibbsite surfaces.

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