Patent ID: 8088195

Claim:
A method for manufacturing a titanium oxide-containing slag, comprising the steps of: (A) heating a raw material mixture including at least 40% titanium oxide, iron oxide, and carbonaceous reductant in a reducing-melting furnace to a reducing temperature that does not exceed 1400° C.; (B) reducing the iron oxide in the mixture to form reduced iron; (C) further heating the resultant mixture to melt the reduced iron and separate the reduced iron from a titanium oxide-containing slag formed upon melting the reduced iron in the reducing-melting furnace; (D) discharging the titanium oxide-containing slag out of the furnace, wherein the reducing-melting furnace is a moving hearth reducing-melting furnace; and (E) recovering the separated and discharged titanium oxide-containing slag, wherein the reducing-melting furnace has at least two sections in a moving direction of the hearth, one of the sections being upstream of the hearth in the moving direction is a reduction section, the other section being downstream of the hearth in the moving direction is a heating melting section, and the temperature of each section is separately controlled, wherein the temperature of the reduction section is in the range of 1200° C. to 1500° C., the temperature of the heating melting section is in the range of 1300° C. to 1500° C., and the temperature of the heating melting section is 100° C. to 300° C. higher than that of the reduction section.