Water slag is formed by rapidly cooling molten blast furnace slag in water, mainly by water quenching in slag pool and water quenching in front of furnace. Blast furnace slag is a kind of molten material, mainly composed of calcium silicate and calcium aluminate, which is produced in the process of pig iron smelting by blast furnace. It is granulated by water quenching. It is referred to as water slag, water quenched slag and so on. When the furnace temperature reaches 1400-1600℃, the burden melts, gangue in ore, ash in coke, cosolvent and other impurities which can not enter pig iron form slag mainly composed of silicate and aluminate, whose main components are CaO, SiO₂ and Al₂O₃.
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