FW浮選機における槽内流相と自吸外気量

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書誌事項

タイトル別名
  • Flow Patterns and Air-introducing Capacity in the Fahrenwald Flotator
  • FW フセンキ ニ オケル ソウ ナイリュウソウ ト ジキュウガイキリョウ

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抄録

Along with the increased addition of frother, the self-air-inhaling capacity will decrease.The phenomenon like this is simply supposed to be due to the fact that in proportion to the breaking up of air bubbles into smaller ones, the speed at which they come off the agitating zone will get lowet, and nc other reason is not known yet in detail.<BR>Standing on the view-point above, the author measured the flow patterns and the state of dispersion of bubbles within the pulp in the cell to make clear the relationship of them with the introduced air quantity under the same experimental condition with varying number of baffle plate and obtained the following results:-<BR>1) The state of dispersion of air bubbles in the cell is depended considerably upon the flow-patterns, within the pulp, provided with the same condition, the self-air-inhaling capacity beiog varied in accordance with the change of the state of dispersion above.<BR>2) The pulp, first forming the up-rising flow with rotation along the cell-wall and approaching the cell-corners, then rolling back, and take the form of down-falling flow with rotation around the external surface of the stand pipe.<BR>3) The displacing speed of bubbles up-rising along the external surface of the hood will not only be affected by the down-falling flow, but minuter air-bubbles rising up along the cellwall, will, without coming up to the water surface, be rolled back into the down-falling flow.Accordingly, the vertical motion of both up and down flows being large, the smaller the air bubbles are, will the quantity of bubbles of air staying around the external surface of the hood become the larger.<BR>4) The more the quantity of air-bubbles staying around the external surface of the hood, will the more quantity of air-bubbles be reinhaled by the impeller, the faculty of the impeller inhalina the open air being lowered.(Cf.foregoing reports of the author)<BR>5) Along with the increase of the number of baffle plates, since not only the rotating flow will be. disturbed but the up-rising flow will be homogenized and its velocity be lowered, the down-falling flow too will become non-significant.<BR>Accordingly the air-bubbles will be uniformly dispersed with the decrease of the quantity of them staying around the external surface of the hood.

収録刊行物

  • 日本鑛業會誌

    日本鑛業會誌 78 (893), 809-816, 1962

    一般社団法人 資源・素材学会

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