Abstract:The dry granulation method can overcome a series of problems caused by the water quenching method of blast furnace slag traditional treatment method. As a promising dry treatment method, gas quenching injection method can significantly recover sensible heat of blast furnace slag and increase the added value of slag utilization. In order to study the feasibility of blast furnace slag as gas quenching raw material, the flowability, surface tension and crystallization behavior of BFS are studied by adjusting and tempering BFS with different basicities. The influence of physical properties of BFS on granulation effect is analyzed. The results show that the viscosity of alkaline slag at high temperature is less than that of acid slag. When the basicity is more than 1.0, the viscosity of the high temperature zone is basically kept below 1 Pa·s, which is not easy to form fiber and is more beneficial to break into beads. However, the viscosity tends to increase after more than 1.3, and the melting temperature increases sharply, so the basicity is not easy to be too large. With the increase of basicity, the surface tension increases gradually, which is helpful to improve the regular degree of slag beads. With the increase of basicity, the glass decreases gradually, which is not conducive to improving the phase quality of slag beads.
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