Bracket the useful charge range
Medium-charge products can be useful when a mineral slurry contains adsorption sites or dissolved cations that support anionic-polymer attachment, but the correct position cannot be inferred from industry name alone.
Test representative ore, clay, wash-water chemistry and recycle-water conditions. Include upstream lime, metal salts, dispersants or collectors because they can move the optimum.
Apply the real shear path
Mixing must distribute polymer without cutting newly formed flocs. Reproduce feedwell energy, pipe length and pump exposure as closely as practical, then observe whether the floc survives and the overflow remains stable.
For thickening, track settling rate, underflow density and rake response. For clarification, emphasize overflow clarity and the ability to manage settled solids without unstable carryover.
Normalize treatment cost
Convert neat-emulsion flow to active polymer per dry tonne of solids. Include actual feed solids and product active content rather than comparing litres or delivered price alone.
Relate chemical cost to recovered water, throughput, underflow handling and filtration behavior. A wider stable window may be more valuable than a narrow laboratory maximum.

