Abstract
High content amorphous phase blast furnace slag beads were prepared by gas quenching blast furnace slag (BFS), which could not only avoid a series of environmental problems caused by traditional water quenching methods, but also significantly increase the added value of BFS subsequent products. In this paper, the granulation mechanism of BFS and the amorphous phase formation mechanism of slag beads were studied by combining the physical properties of BFS and the granulation effect. The results showed that the viscosity of BFS decreased with the increase of basicity; the bigger the basicity, the higher the bead formation rate, the smaller the particle size and the more regular the slag shape. The smaller the basicity, the greater the crystallization activation energy and the smaller the Avrami exponent, which indicated that the crystal was more difficult to nucleate and grow. The increase of the cooling rate could effectively inhibit crystal precipitation. Therefore, the high basicity and cooling rate could not only guarantee the high bead formation rate of BFS, but also ensure the high content amorphous phase of slag beads.
Highlights
Blast furnace slag, as bulk solid waste produced in the ironmaking process, will inevitably pollute the environment and occupy a large amount of land resources if it is not treated and utilized [1,2].The traditional water quenching method of blast furnace slag (BFS) will consume a lot of new water in the process, pollute the atmosphere by gases such as H2 S and SO2, waste a lot of sensible heat, and consume a lot of energy to dry the BFS for subsequent utilization [3,4,5]
The dry granulation process can overcome the disadvantages of water quenching and can significantly increase the added value of the subsequent BFS product, which has attracted researchers’
Purwanto [6] studied the influence of rotating speed on the size of slag particles by high speed camera experiment, obtaining the following equation for the particle size: D = 1686/ωr; Yoshinaga [7] studied the cooling rate and solidification time of slag particles and pointed out that in order to prevent the slag particles from sticking to each other in the process of granulation, it is effective to use powder as cooling medium for cooling and solidifying; Kashiwaya [8] combined rotating cup granulation with wind crushing, and the influences of rotor diameter, depth, inclination angle, rotating speed, slag viscosity, and air flow velocity on the granulation effect were studied
Summary
As bulk solid waste produced in the ironmaking process, will inevitably pollute the environment and occupy a large amount of land resources if it is not treated and utilized [1,2]. The traditional water quenching method of blast furnace slag (BFS) will consume a lot of new water in the process, pollute the atmosphere by gases such as H2 S and SO2 , waste a lot of sensible heat, and consume a lot of energy to dry the BFS for subsequent utilization [3,4,5]. There are few studies on the granulation mechanism of BFS and the amorphous formation mechanism of slag beads.
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