Apparatus for forming a vortex

摘要

Apparatus for forming a vortex includes inner and outer wall structures. The inner wall has a downward flow passageway therewithin. A plurality of vanes are provided between the wall structures to induce a vortex to form from an upward flow of liquor through the annular passageway between the walls. The wall structures form a settling trough into which solid materials may settle and accumulate.