Reference for citation: Sandulyak D. A., Sandulyak A. A., Polismakova M. N., Еrshova V. А., Sandulyak А. V., Kurmysheva А. Yu., Solovev I. A. Method of ponderomotive control of magnetic susceptibility of disperse samples and particles of iron-containing sorbents. Journal of Instrument Engineering. 2023. Vol. 66, N 7. P. 602—611 (in Russian). DOI: 10.17586/0021-3454-2023-66-7-602-611.

Abstract. In order to increase the efficiency of using powder magnetic sorbents in water purification technology, when one of the key stages of this technology is the rapid isolation of spent sorbent by magnetic separation, the control of the magnetic susceptibility χ of the individual particles of such sorbents is needed. The analyzed methodology of determining magnetic susceptibility is based on obtaining experimental dependence of the magnetic susceptibility of the dispersed sample on the volume fraction γ in it of controlled particles and identifying the linear initial section of this dependence (limited by criterion value γ = [γ]), the specified section of this dependence indicates the practical absence of magnetic interaction of the particles. So at γ = [γ], χ -values are determined as χ = /γ. By ponderomotive method (using modernized magnetometer with spherical pole pieces for creating zone of a stable inhomogeneity field) γ -dependence of is obtained for magnetic sorbent (carbon sorbent with inclusions of magnetite and maggemite), and value of [γ] is found. The magnetic susceptibility χ of the particle in the field of strength H = 61 kA/m is determined from its linear section, up to the criterion value [γ]. It also seems possible to obtain an expanded field dependence for χ.

Keywords: iron-containing sorbent, magnetic susceptibility, modernized ponderomotive-type magnetometer, criterion of volume fraction of particles

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