Conclusions
The process of drying of ferrite suspensions with solid-phase concentrations ranging from 30 to 65% occurs in three stages. In the second, limiting stage evaporation takes place. The length of this period depends on external heat-transfer and mass-transport conditions (drop diameter and temperature of the ambient atmosphere). In ferrite suspensions composed of charge material and an aqueous solution of polyvinyl alcohol the physicomechanical bond between the moisture and material predominates. Plant for the production of ferrite powder by the suspension spray-drying method can be calculated and designed using heat-transfer and moisture-transport equations for capillary porous solids.
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Literature cited
M. V. Lykov and B. I. Leonchik, in: Spray-Drying Plant [in Russian], Mashinostroenie, Moscow (1966) pp. 112–118.
A. N. Malakhovskii and Yu. M. Khomyakov, “Effect of percentage plasticizer content on the properties of an Li-Mn ferrite with a rectangular hysteresis loop,” Transactions of a Republican Seminar on Ferrites [in Russian], Kiev (1971), pp. 21–25.
A. V. Lykov, in: Theory of Drying [in Russian], Énergiya, Moscow (1968), pp. 83–138.
A. N. Planovskii, in: Processes and Plant Used in Chemical and Petrochemical Technology [in Russian], Khimiya, Moscow (1972), pp. 150–152.
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Translated from Poroshkovaya Metallurgiya, No. 3(207), pp. 76–78, March, 1980.
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Malakhovskii, A.N. Drying kinetics of single drops by ferrite suspensions. Powder Metall Met Ceram 19, 201–203 (1980). https://doi.org/10.1007/BF00798482
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DOI: https://doi.org/10.1007/BF00798482