How much do you know about slag in blast furnace ironmaking?

The mineral composition of blast furnace slag is related to the production raw materials and cooling methods. In the slowly cooled crystalline slag, the main minerals in alkaline blast furnace slag are calcium aluminum yellow feldspar and calcium magnesium yellow feldspar, followed by dicalcium silicate, pseudowollastonite, calcium feldspar, calcium magnesium olivine, magnesium roseite, and magnesium spinel. The mineral components in acidic blast furnace slag are mainly feldspar, pseudowollastonite, pyroxene, and plagioclase. The main minerals in vanadium titanium blast furnace slag are perovskite, anoxene, titanium pyroxene, bayite, and spinel. The main mineral in manganese iron slag is olivine. The main minerals in high alumina slag are dicalcium aluminate, pentacalcium trialuminate, and dicalcium aluminate. The main mineral in mirror iron slag is rose pyroxene. In crystalline slag, except for high alumina slag, only dicalcium silicate has cementitious properties, and other minerals do not have or only have weak cementitious properties, so they basically do not have water hardness. The rapid cooling slag is mainly composed of glass body, and its content is closely related to the chemical composition and cooling rate of the slag melt. Generally, the glass body content of acidic slag is higher than that of alkaline slag, and the faster the cooling rate, the higher the glass body content.