Producing high-quality coke from blends of domestic and imported coal at PAO Zaporozhkoks

The evolution of quality requirements on blast-furnace coke indicates the need to use low-sulfur imported coal of the required quality. The best performance characteristics of European blast furnaces are noted. At such furnaces, with the injection of pulverized coal, the consumption of low-reactivity blast-furnace coke is 280.9–355.8 kg/t of hot metal. On the basis of the requirements imposed on coal used in the production of low-reactivity, low-sulfur, high-strength coke, an industrial coking method has been developed and tested at PAO Zaporozhkoks on the basis of Ukrainian, Russian, and United States coal of the required quality. The coke produced is tested in blast furnace 5 at PAO Zaporozhstal’. The results show that coke of improved quality may be obtained from batch containing 50% Ukrainian coal, 30% Russian coal, and 15% United States coal at PAO Zaporozhkoks. Thus, in the first 11 months of 2013, the quality of the blast-furnace coke produced was as follows: moisture content 3.6%; ash content 11.0%; sulfur content 0.78%; M 10 = 6.3%; content of the >80 mm class 4.1%; content of the <25 mm class 3.1%; CRI = 31.8%; CSR = 51.9%.