Abstract
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 χ 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 χ 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 χ, 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—gradH that characterizes the nonuniformity of the field and plays a more role in the gripping of the particles.
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