Rapid solid/liquid separation of ultrafine particles from diluted suspension using surface characteristics. (2nd Report). Separation of Ultrafine Silica Particles by Surface Modified Slag Wool.

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  • HAYASHI Hiroshi
    Graduate School of Science and Engineering, Waseda University, Shinjuku–ku, Tokyo 169–8555
  • SASAKI Hiroshi
    School of Science and Engineering, Waseda University

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Other Title
  • 界面特性を利用した超微粒子希薄懸濁液の迅速固液分離　（第２報）　　表面処理したスラグウールによる超微粒シリカの分離
  • 表面処理したスラグウールによる超微粒シリカの分離--界面特性を利用した超微粒子希薄懸濁液の迅速固液分離(2)
  • ヒョウメン ショリ シタ スラグウール ニ ヨル チョウビリュウ シリカ ノ ブンリ カイメン トクセイ オ リヨウ シタ チョウビリュウシ キハク ケンダクエキ ノ ジンソクコエキ ブンリ 2

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Abstract

The rapid separation of fine silica particles (mean diameter of 200 nm) deposited from geothermal water were investigated by using a column bed packed with ferro-nickel slag wool. If repulsive double-layer interaction prevented particle adhesion on collector wool surface, collection efficiency greatly improved by modifying the slag wool surface with ferric hydroxide, aluminium hydroxide or aluminium silicate. In the experimental results, silica collection in 1 mM KNO3 electrolyte at pH 5 reached 17 % at dimensionless time 2 by Fe-Ni slag wool collector. On the other hand, silica recovery prominently increased up to 80 % by ferric hydroxide modification wool, 100 % by aluminum hydroxide modification wool and 85 % by aluminum silicate modification wool. These results were interpreted by the heterocoagulation theory, estimating surface interaction energy between silica particle and collector surface.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 115 (1), 24-28, 1999

    The Mining and Materials Processing Institute of Japan

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