TY JOUR TI Economics of blast furnace processing: the impact of raw materials and energy tariffs on margins KW blast furnace processing KW pig iron cost KW pulverized coal fuel KW coke quality KW energy tariff KW blast furnace gas utilization KW simulation modeling KW metallurgy margin JO JOURNAL OF MONETARY ECONOMICS AND MANAGEMENT AU Tasalova, E.M. PY 2025 IS 0 PB ITBO University