The Effect of Roasting Temperature on Ilmenite Particle Rotation Characteristics in a Rotating Magnetic Field

Individual ilmenite particle measurements of magnetic susceptibility and magnetic rotation index show that, as ilmenite roast temperatures increase, both the magnetic anisotropy and the coercive force increase. By around 650°C the particles are behaving magnetically, in magnetic fields up to 0.3 T as though they contain magnetic elements with a single unidirectional magnetic axis.The presence of some magnetic field, even that of the earth, during the cooling of ilmenite samples roasted above 500°C may be essential to the magnetising roast process.

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Phenomenological Interpretation of Classical Expression for Force Affecting a Ferroparticle in the Magnetic Field

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.595.70 ◽

2014 ◽

Vol 595 ◽

pp. 70-75

Author(s):

Anna Sandulyak ◽

Alexander Sandulyak ◽

Vera Ershova ◽

Alexander Snedkov ◽

Darya Sandulyak

Keyword(s):

Magnetic Field ◽

Magnetic Susceptibility ◽

Magnetic Separation ◽

Magnetic Induction ◽

Magnetic Force ◽

Magnetic Gradient ◽

Polar Surface ◽

Magnetic Elements ◽

Classical Expression ◽

Force Impact

The unprecedented attempt has been made to fully expand classical and often quoted (above all by magnetic separation regimes and conditions analysis) expression for the force affecting the ferroparticle in magnetic field with the functional character of the following parameters of this expression being taken into account: magnetic induction, magnetic gradient and ferroparticle magnetic susceptibility. For this purpose a particular case of force impact has been analyzed in field approximating one-dimensional field. This field is produced in module of two distantly oriented magnetic elements. The obtained dependences for magnetic induction, magnetic gradient and ferroparticle magnetic susceptibility (according to distance x to polar surface one of the magnetic elements) have been used. By the analysis the fact has been taken into account that ferroparticle magnetic susceptibility depends on its shape as well as substance magnetic susceptibility depends, in its turn, on magnetic field intensity around ferroparticle. In other words, magnetic susceptibility of material depends on distance x to polar surface usually being ignored. The analysis of the following expanded variant of magnetic force expression allows to determine that phenomenological dependence (on parameter x) which has a very simple exponential form can be an alternative to this expression. Such dependence can be reasonably used by decision-making in theoretical and practical tasks of magnetic separation. The undertaken attempt to specify the role of another parameter B0 – magnetic induction on polar surface (that is often considered as the most essential) – shows the power (approximating square) character of magnetic force concerning this parameter.

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Particle Rotation in Colloidal Processing under a Strong Rotating Magnetic Field

Langmuir ◽

10.1021/acs.langmuir.7b04344 ◽

2018 ◽

Vol 34 (22) ◽

pp. 6462-6469 ◽

Cited By ~ 4

Author(s):

Shoko Baba ◽

Satoshi Tanaka

Keyword(s):

Magnetic Field ◽

Rotating Magnetic Field ◽

Colloidal Processing ◽

Particle Rotation

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Fabrication of Textured β-Si3N4 and β-Sialon by Slip Casting in a Strong Magnetic Field and Reaction-Sintering

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.434-435.5 ◽

2010 ◽

Vol 434-435 ◽

pp. 5-8

Author(s):

Yoshio Sakka ◽

Xin Wen Zhu

Keyword(s):

Magnetic Field ◽

Magnetic Susceptibility ◽

Strong Magnetic Field ◽

Static Magnetic Field ◽

Slip Casting ◽

Rotating Magnetic Field ◽

Texture Development ◽

Reaction Sintering ◽

Magnetic Filed ◽

Orientation Ability

This paper reviews the most important results by the authors on the processing of textured -Si3N4 and -sialon by slip casting in a strong magnetic filed of 12 T and reaction-sintering. The a, b-axis textured -Si3N4 and -sialon have been obtained using the static magnetic field because of the magnetic susceptibility of ca, b > c c for -Si3N4. However, the c-axis textured -Si3N4 has also been successfully obtained using a rotating magnetic field. The -Si3N4 crystal was found to exhibit substantially stronger orientation ability than the a-Si3N4 crystal regardless of the Si3N4 raw powders. It reveals that the -Si3N4 nuclei play a key role in the texture development in -Si3N4/-sialon.

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