| 摘要 |
<p>927,342. Reduction of iron oxides. R-N CORPORATION. Dec. 5, 1961 [Dec. 6, 1960], No. 43571/61. Class 72. A process for the direct reduction of iron oxide material comprises charring coal to provide a low volatile coke char with evolution of gases, mixing iron oxide material and the char, and reducing the oxides in a furnace without fusion, the evolved gases being burned with a controlled amount of oxygen to produce heat for the reduction. As shown, coal of size passing # inch mesh is delivered to a bin 35 from the bottom of which it is delivered to a fluidized feeder 41 wherein it is dried and preheated to 160‹ F. by gases. The dried coal then passes to a fluidized bed pretreater 44 where it is heated under oxidizing conditions and then flows to a fluidized bed coker 65 where the bed is maintained at 1550‹ F. and the volatile content of the coal reduced to 5%. The coke then passes to one of a series of bins 23-26, provided for the storage of iron oxide, limestone, fresh coke and recycle coke, from which it is fed with iron oxide and limestone to a rotary furnace 1, the gas from the coker being conveyed to a burner 22 at the other end of the furnace. Excess coke from the furnace discharge may be recycled to the bins 23-26. A moving grate coker may replace the fluidized bed coker. Specifications 803,008 and 882,324 are referred to.</p> |
