Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Patent
1997-12-24
1999-06-15
Straub, Gary P.
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
266190, 266191, 423148, 423151, 423488, 423630, 423632, 423633, C21B 710, C01G 100, C01G 4902, C01B 707
Patent
active
059119675
ABSTRACT:
A process and an apparatus for the production of iron oxides having low chloride ion content comprising charging of a free HCl containing iron chloride solution into a spray roaster with a feeding device and a spray boom for charging the iron chloride containing solution into a reaction chamber heated by combustion gases thermally decomposing the solution into iron oxide, HCl gas and reaction gases a discharging device for the iron oxide and a cooling zone between the burner's focal plane and the discharging device cooling of iron oxide granules to temperatures at less than 450.degree. C. reducing the concentration of HCl gas to less than 10 volume percent charging the layer of iron oxide granules onto a conveyor plate charged with hot steam and feeding the exhaust gases into the central combustion duct of the spray roaster. The resulting iron oxide has a residual chloride ion content of less than 500 ppm Cl.sup.- and a specific surface area in excess of 3.5 m.sup.3 /g.
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Nguyen Cam N.
Straub Gary P.
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