Effect of Slag Regime on Alkaline Compound Behavior in a Blast Furnace

Abstract

The effect of alkaline compounds on blast furnace operation is studied. It is shown that the main mass of alkaline compounds enters a blast furnace with sinter, coke ash, and pellets, and the main part of alkali emerges from a blast furnace with slag. A quantitative effect is established for an increase in the emergence of alkali with slag with a reduction in final slag basicity. The periodic nature of alkali removal with slag is established. It is found that it is necessary no less frequently that once every 4–5 days in each blast furnace to carry out two to three operating shifts with final slag reduced basicity (CaO/SiO₂) (lower by 0.05–0.15 units than prescribed by the production chart). The technology proposed for alkaline compound removal is protected by an RF patent and implemented at the Magnitogorsk Metallurgical Combine since 2012.