A Hallimond microflotation cell is composed of a bottom (with a frit to permit air to pass through), a middle, and a top part, with total internal volume about 120 mL. Similar to a modified Patridge-Smith cell, it tests mineral’s response at a certain flotation condition. Unlike P.-S. cell, it minimizes the number of floated particles that fall back to the pulp with a bending shape. Each test is usually done on 1 g of mineral sample, with air flowrate around 35 cc/min.