Method of magnetizing reduction of iron ore

Claim 1

A PROCESS FOR THE REDUCTION OF COMMINUTED NONMAGNETIC IRON OXIDE ORE TO MAGNETIC IRON OXIDE, COMPRISING THE STEPS OF PASSING SAID ORE THROUGH A PREHEATING ZONE IN A ROTARY FURNACE, PASSING THE RESULTING PREHEATED ORE INTO A REDUCING ZONE DEFINED BY A PERIPHERAL CIRCUMFERENTIAL SURFACE OF SAID FURNACE TO FORM DURING THE ROTATION OF THE SURFACE A TUMBLING HOT BODY OF MUTUALLY MOVING PARTICLES THEREIN, INTRODUCING LIQUID FUEL OIL INTO THE INTERIOR OF SAID HOT BODY, THE OIL THEREBY REDUCING AT LEAST PART OF SAID ORE TO MAGNETIC IRON OXIDE AND FORMING A COMBUSTIBLE GAS, WITHDRAWING SAID COMBUSTIBLE GAS FROM SAID HOT BODY AND BURNING IT OUT OF CONTACT WITH SAID BODY, INTRODUCING THE RESULTING COMBUSTION GASES INTO SAID PREHEATING ZONE TO PREHEAT SAID ORE, PASSING THE HOT REDUCED ORE THROUGH SAID PREHEATING ZONE IN HEAT EXCHANGE RELATIONSHIP WITH THE INCOMING NON-MAGNETIC IRON OXIDE ORE TO ADDITIONALLY PREHEAT SAID INCOMING ORE AND PASSING THE REDUCED ORE OUT OF THE FURNACE.