鉱粒懸濁液の超音波凝集の機構について

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タイトル別名
  • The Mechanism of Supersonic Coagulation of Mineral Particles Suspending in Water
  • コウリュウ ケンダクエキ ノ チョウオンパ ギョウシュウ ノ キコウ ニ ツイテ

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抄録

Supersonic coagulation process seems to be one of the most promising applications of the supersonic energy to mineral dressing. However, its further developments on the industrial scale have been kept back on account of the poor knowledge of the basic principles involved in that process. The authors studied the fundamental mechanism underlying the phenomenon of supersonic coagulation, with particular reference to the electro-kinetic theory of flocculation which has made a great progress in the field of colloid chemistry. In this connection, the function of the supersonic waves for flocculation is considered mainly to supply the mineral particles with the energy which is required to surpass the potential barrier to flocculation, while the function of the flocculating agents is, in general, to change the shape of the flocculation potential curve.<BR>Irradiation experiments were performed on the suspensions of quartz in pure water or in water modified with various reagents such as HCI, NaOH, dodecylammonium acetate, Separan and MIBC, under various frequencies (0.6-4.0 Mc/s) and controlled intensities of the supersonic waves. Consideration of the experimental results in the light of the “flocculation energy” lead to the conclusion as follows:<BR>(1) The differential vibration among the liquid and the mineral particles plays little part in the supersonic coagulation of aqueous suspensions.<BR>(2) The role of the radiation pressure due to standing waves is dominant in supersonic flocculation phenomena, especially when the suspension has a great tendency to dispersion.<BR>(3) Hydrostatic attraction among the particles, which is caused, according to the theorem of Bernoulli, by the rapid flow of the liquid in the voids, is supposed to play the part of compacting the flocs. This effect will be more pronounced in the case of the suspensions with a great tendency to flocculation, where large flocs (up to several millimeters) are observed.<BR>(4) Effect of surface activity of supersonic waves on flocculation could not be established in so far as the authors' experiments were concerned.<BR>Suggestions were also given which will do for the industrial applications of supersonic flocculation process of the liquid-solid system.

収録刊行物

  • 日本鑛業會誌

    日本鑛業會誌 76 (860), 93-100, 1960

    一般社団法人 資源・素材学会

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