焼結金属製円錐を持つ液体サイクロンの分級特性

摘要

The classification performance of a novel hydro-cyclone with a cone part fabricated by porous sintered metal was evaluated. The clean air injection through the porous cone was proposed as a new method to control the classification performance. As a result, when the flow rate of the main slurry was relatively low, the introduction of adequate clean air through the porous cone could reduce the cut size without compromising the separation accuracy. It may be caused by an increase in the flow velocity of the slurry near the cyclone cone surface induced by fine bubbles which were made by the clean air. However, the excessive injection of clean air degraded both the cut size and the separation accuracy. By contrast, in the case of the relatively high flow rate of the slurry, the injection of the clean air had little influence on the classification performance.%液体サイクロンは，流体を旋回させて生じる遠心力を利用して，スラリーから固体粒子を分離，濃縮または分級を行う装置である。液体サイクロンは動力がポンプのみであり，小型で構造が簡単である。また，大量のスラリーを処理することが可能であり，安価に製作，維持が可能である。液体サイクロンはこのような特徴を有していることから，汚染土壌の浄化処理などを始め様々な用途で用いられている。