A clear schematic diagram of a vertical bubble column for ion flotation with foam fractionation, showing gas, liquid, and foam zones with labeled inlets and outlets.

A clean, professional schematic illustration of a vertical bubble column for ion flotation with foam fractionation. White background, flat 2D engineering style, thin black outlines, soft blue shading for liquid phase, light gray fine bubbles. Show and clearly label: • Gas inlet at the bottom • Fine bubble sparger (porous plate) • Gas–liquid contact zone with rising microbubbles • Collection zone • Foam fractionation zone with downward liquid drainage arrows • Optional wash water inlet near the top • Stable foam layer • Foam/concentrate outlet at the top • Liquid feed inlet at upper-middle • Clarified liquid (underflow) outlet at the bottom Arrows showing countercurrent flow: gas upward, liquid downward. Technical textbook/journal figure style, no 3D effects, no people, high resolution. See more