Improving the shaft smelting of minerals by changing the activity of coke

Abstract

Metallurgical coke is a common fuel in smelting shaft furnaces. The properties of the coke largely determine furnace performance. If coking additives are used to stabilize the properties of the coal batch, coke of increased hot strength may be obtained, with reactivity CRI = 18-22% and density of the pieces 1200-1400 kg/m 3 . Industrial tests on a slag cotton cupola furnace establish the variation in its performance when using experimental coke, with reduction in coke consumption by 0.20-0.25% and increase in heat input by 90 kW on average. The proportion of heat in the melt is increased here, along with the degree of incomplete combustion. The heat consumption in melting the initial components declines by 2.3% on average, while the total thermal efficiency of the system decreases by 1.8% for each additional 10% of the experimental coke.