METHOD FOR PRODUCING WEATHER-RESISTANT SUPERFLUXED METALLIZED PELLETS FROM IRON-BEARING FINES AND A SUPERFLUXED METALLIZED PELLET PRODUCED THEREBY

摘要

A method for producing weather-resistant superfluxed metallized iron pellets from iron-bearing fines. A mix containing about 56 percent to about 85 percent iron-bearing fines, about twelve percent to about 40 percent flux material and about 3 percent to about 4 percent solid reductant is prepared. The mix is balled. A charge of balls, a flux and a solid reductant in a weight ratio of 100 pounds:5 pounds:100/200 pounds respectively is placed in one end of a rotary kiln. The charged materials are heated to about 1,900 DEG F. for a time sufficient to calcine the flux materials and to reduce 90 percent of the iron to the ferrous state. The charged materials are further heated to a temperature range of about 2,000 DEG F. to about 2,200 DEG F. for a time sufficient to reduce about 80 percent to about 99 percent of the iron to the metallic state. The pellets are cooled to below 300 DEG F. and discharged from the kiln.