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Steel slag is a by-product of the steelmaking process.It is composed of various oxides formed by oxidation of impurities such as silicon, manganese, phosphorus and sulfur in pig iron and salts formed by the reaction of these oxides and solvents.The mineral composition of steel slag is mainly composed of tricalcium silicate, followed by dicalcium silicate, RO phase, dicalcium ferrite and free calcium oxide.Steel slag contains a variety of useful ingredients: calcium, iron, silicon, magnesium, and a small amount of oxides such as aluminum, manganese, and phosphorus.The finished slag produced by different steel slag treatment processes also has different properties and qualities.At present, the steel slag treatment methods in China mainly include cold discarding method, water quenching method, wind quenching method, granulation method, hot splashing method, hot braising method, drum method, etc. Among them, hot splashing method and hot braising method are currently relatively advanced steel slag treatment technologies, while other steel slag treatment methods have been gradually eliminated.
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