RED IRON OXIDE FROM PICKLING LIQUOR FROM WASTE FROM STAINSESS STEEL ROLLING MILLS

摘要

Pickling liquor from s.s. Rolling mill is treated by metal and is neutralized in an alkaline medium by dilute Ammonium hydroxide. The resulting slurry is filtered to obtain the precipitates of iron compounds. The precipitates are washed thoroughly. To the wet precipitates water is added to create the slurry containing 30% solids. Air is bubbled through this mixture for an hour to oxidize the iron compounmds. The precipitates are then filtered and dried at 80 to 100ºc. The dried precipitates are ground to fine powder and calcined at 250ºc for 2hr. to obtain pigment grade Red Iron Oxide.