Reducingthechloridecontentinregeneratedironoxides(RIO)fromsteel-picklingacidwasteeconomicallytreatedbyRuthnerprocessisthemostcriticalissueforthedevelopmentofRIOasausefulrawmaterialresource.Inthispaper,theresultsofanewmethodforcharacterizationandmodificationofRIOproducedinMobarakehSteelComplexwerereported.