Artificial zinc sulphide ore is a synthetic ore that was produced by neutralized residue through hydrothermal sulphidation, which was generated in process of smelter wastewater treatment. Because of its grain particle size, high surface free energy, and the components agglomeration, it is difficult to be separated with each other by flotation. The experimental results showed that the concentrate grade of zinc has been increased from 14% to 28%, with recovery of 90%, under the acidic condition, with sodium hexametaphosphate as dispersant and glutinous rice starch as flocculant. By contrasting t...