REDUCTION BEHAVIOR OF SINTER WITH MEDIUM AND LOW-TEMPERATURE CARBONIZED COKE IN MIXED BED

Modification of present coke oven and development of different type of coking process are investigated by many institutions. In such a trend , much attentions are paid to lower the production cost by decreasing the carbonization temperature. In this study, Medium Temperature Carbo nized Coke (MTCC) or Low Temperature Carbonized Coke (LTCC) and sinter in mixed bed were served to heating-up reduction experiments. Experim ental conditions were as follows. heating-up rate was 10 degrees C/min from 200 degrees C to 1450 degrees C and gas composition was Ar-25.5% CO-4.5%CO2. Coke carbonized at lower temperature has generated larger amount of H-2 and had much effects on reduction. So H-2 from LTCC had larger effects on reduction both directly and indirectly than MTCC. In the temperature range from 600 degrees C to 900 degrees C, gasificati on reaction of high reactive carbon from carbon deposition reaction be low 600 degrees C increased the reduction potential of gas and promote d the reduction reaction. In temperature range from 900 degrees C to 1 250 degrees C, not only the reduction by generated H-2 directly, but a lso gasification and reduction were promoted simultaneously by mutual activation phenomenon between gasification and reduction.