Research on RO phase selection for modification of steel slag powder
Our company's steel slag has a tailings of about 600 000 tons after crushing and magnetic separation throughout the year.However,due to its unstable performance,poor grindability of RO phase,and lack of hydration activity of oxides,the final activity index of steel slag powder is seriously affected.Magnetic separation can effectively reduce the RO phase in steel slag and improve its perfor-mance in cement.The experimental results show that when steel slag is ground to a suitable specific surface area,selecting the RO phase can significantly remove the non active substances in the slag,achieve the decomposition of RO phase and active minerals,and reduce MgO;When the specific surface area of steel slag powder is controlled between 450～500 m2/kg,its activity can be well exerted:When the proportion of steel slag powder in the composite powder is 5％,the performance and various indicators of cement are good,which can replace some high-quality mixtures and have good economic benefits.
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