Sharper selective depression
Ozone oxidation tunes starch to render hematite hydrophilic even in amine flotation, improving depression without sacrificing flocculation—suited for fine hematite reverse flotation.
Zhang, Ming · Xu, Zeping · Zhang, Qin · Zusu, Dan · Hongqi, Fu · Yao, Wei
Minerals Engineering 2023
Micro-flotation: OS depressed hematite more than native starch
Lower contact angle, more hydrophilic surface (with amine collector)
Flocculation performance comparable to native starch
Ozone treatment increased acidity, solubility, and depolymerized starch into low-MW derivatives