Actual Role of the Magnetic Susceptibility of Particles in Magnetophoresis (Magnetic Separation)
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ACTUAL ROLE OF THE MAGNETIC SUSCEPTIBILITY OF PARTICLES IN MAGNETOPHORESIS (MAGNETIC SEPARATION) A. V. Sandulyak,1 M. N. Polismakova,1 A. A. Sandulyak,1 A. B. Snedkov,1 V. A. Ershova,2 D. A. Sandulyak,1, 4 and N. Pamme3 Translated from Steklo i Keramika, No. 2, pp. 36 – 43, February, 2020. It is remarked that in magnetophoresis (one form of which is magnetic separation, which is used in different industries, including glass and ceramic) information on the magnetic susceptibility c of magnetically active particles, which depends on the intensity H of the applied field, is just as fundamental as information on fractional content of the particles. Data obtained on c for iron-containing impurity particles of quartz sand from measurements of the magnetic susceptibility of their powder samples are presented. It is shown that the parameter c, which is inversely dependent on H with exponent close to 0.75, significantly suppresses the role of the parameter H appearing in the basic expression for the magnetic force gripping the particles. It is recommended that in developing a magnetophoresis (separation) apparatus attention should be focused on not so much the parameter H but rather the parameter — grad H that characterizes the nonuniformity of the field and plays a more role in the gripping of the particles. Key words: iron-containing impurity particles, magnetic susceptibility, field intensity, inverse power-law function, magnetic force.
attention should be given to one of the fundamental questions of magnetophoresis (m0 = 4p ´ 10 – 7 H/m is the magnetic constant). This question concerns the quantitative determination of the magnetic properties of the particles themselves and their actual role, here the role of the magnetic susceptibility c of the particles; the significance of c in questions concerning magnetophoresis is discussed in many works, specifically [7 – 9, 13 – 15]. Purely superficially, for the time being without detailing the degree of variability of the parameter c analyzed below as a function of the intensity H of the applied field, the expression seemingly points to a direct relation between the magnetic force Fm and the susceptibility c of a particle, i.e.
The effectiveness of any form of magnetophoresis, which increasingly used to solve different technological, biological, and environmental problems [1 – 15], depends first and foremost on the required magnetic action on the magnetically active particles present in the carrying medium — liquid, loose, gaseous. This also pertains fully to a very common form of magnetophoresis – magnetic separation of different natural and technological media, including in the manufacture of glass and ceramic products, viz. quartz sand, feldspar, chalk, kaolin, ceramic suspensions, and others [2 – 6]. To understand the particularities of the action of a magnetic force on a magnetically active particle and to obtain adequately predictable results of this action, given the well-known general expression [4, 7, 9 – 15] for the magnetic (ponderomotive) force Fm acting o
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