REDUCING OF CO2 EMISSIONS IN BLAST FURNACE PROCESSTHROUGH DECREASING OF COKE CONSUMPTION ANDUTILIZATION OF WASTE DUE TO THEIR MUTUAL EFFORTSTOWARDS PRODUCTION OF SELF-REDUCING PELLETSNATALIIA VANIUKOVA, DMITRIJ KOVALYOV, ANTON VANIUKOV, ALEXANDER VYSKREBENETS AND YANA MIANOVSKA
In the present research the method of investigation the reduction process of self-reducing pellets (SRP) was developed. It was taking into account the specificity the reduction of such pellets, namely, a close contact of solid carbon with iron oxides, development of direct reduction process at temperatures below 900 °C, and transition then to the two stages scheme and to the reducing process by temperatures above 900 °C with the intensification the gasification process of the solid carbon. In connection with the above characteristics of reduction process the SRP - studies have been performed in the temperature range 750-1100 °C. The degree of reduction was evaluated to decrease in oxygen mass based on carbon consumption values. Exposure samples at: 750 °C; 850 oC; 900 °C, 950 °C and 1000 °C amounted to 16 minutes. It is found, that under these conditions with increasing of carbon content in the SRP 8,8%; 16,2%; 24,7% degree of reduction grows and makes accordingly 8%, 15% and 20%. In the temperature range 750oC 900 oC degree of reduction is enhanced through close contact of carbon with iron oxides, which, obviously, leads to intensive development of carbon gasification reaction in the SRP and the simultaneous occurrence of direct and indirect reduction by two stages scheme. Utilization of iron-bearing waste consists of 180-190 kg/ t pig iron by use of SRP in BF process. Consumption in the BF charge amounted 168 kg / SRP / t pig iron. As the result a decrease of coke consumption was by 24 kg / t of pig iron.
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