Summary
The persistent flocculation of magnetite, suspended in water, which is shown by relatively high yield stresses and fast settling, is explained by mutual attraction of magnetite particles as a consequence of magnetic dipoles, induced into them by the earth's magnetic field.
The magnitude of this effect is calculated and compared with other forces affecting particle interaction.
Zusammenfassung
Die persistente (nicht vermeidbare) Flockung von Magnetit, suspendiert in Wasser, die sich bei relativ hohen Fließgrenzen und schnellen Absetzen zeigt, wird durch gegenseitige Anziehung der Magnetit-Teilchen als Folge von magnetischen Dipolen, erzeugt durch das erdmagnetische Feld, erklärt.
Die Größe dieses Effektes wird berechnet und mit anderen Kräften, die die Wechselwirkung der Teilchen beeinflussen, verglichen.
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References
Voet, A., andL. R. Suriani, Dielectrics and rheology of dispersed magnetized particles, J. Coll. Sci.6, 155 (1951);Harvey, Jr. E. N., Effect of magnetic fields on the rheology of ferromagnetic dispersions, J. Coll. Sci.8, 543 (1953).
Meerman, P. G., Interface-active chemicals in coal preparation. Second Symposium on coal preparation, Paper no. 10. (Leeds 1957.)
de Bruyn, H., andP. G. Meerman, Viscometry of settling suspensions with a rotational viscometer. Proceedings of the First International Congress on Rheology II, 160 (Scheveningen 1948).
Meerman, P. G., Viskositätsmessung an sedimentierenden Suspensionen, Kolloid-Z.141, 76 (1955).
Meerman, P. G., andH. J. Odekerken, Sedimentation analysis of magnetite, Fuel32, 62 (1953).
Pieters, H. A. J., andJ. W. J. Hovers, Sedimentation analysis. Fuel25, 138 (1946); ibid.26, 39 (1947). Chem. Weekbl.39, 606 (1942).
Landolt-Börnstein, Zahlenwerte und Funktionen, 6. Auflage, III. Band (Astronomie und Geophysik), 396–405 (Berlin-Göttingen-Heidelberg 1952).
Böttcher, C. J. F., Dielectric constants of crystalline powders, Rec. trav. chim.64, 47 (1945).
Kruissink, Ch. A., De theorie van de diëlektrische polarisatie. Chem. Weekbl.43, 633 (1947).
SeeFrank, P. undR. von Mises, Die Differential- und Integralgleichungen der Mechanik und Physik, Bd. II, 717 (Braunschweig 1935).
Hamaker, H. C., TheLondon-van der Waals attraction between spherical particles, Physica4, 1058 (1937).
Sparnaay, M. J., Directe metingen vanvan der Waals-krachten. Diss. (Utrecht 1952); Chem. Weekbl.49, 457 (1953).
SeeJ. Th. G. Overbeek in Colloid Science I, Chapter VI (edited by H. R. Kruyt). (Amsterdam-Houston-New York-London 1952).
Derjaguin, B., On the repulsive forces between charged colloid particles and on the theory of slow coagulation and stability of lyophobe sols. Trans Farad. Soc.36, 203 (1940).
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Meerman, P.G. Geomagnetic flocculation: An explanation of the rheological behaviour of suspended magnetite. Rheol Acta 1, 106–110 (1958). https://doi.org/10.1007/BF01968847
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DOI: https://doi.org/10.1007/BF01968847