Preparation of glass–ceramics from molten steel slag using liquid–liquid mixing method

Zhang, Kai; Liu, Jianwen; Liu, Wanchao; Yang, Jiakuan

Preparation of glass–ceramics from molten steel slag using liquid–liquid mixing method

2011

Zhang, Kai | Liu, Jianwen | Liu, Wanchao | Yang, Jiakuan

A novel approach to prepare glass–ceramics from molten steel slag (MSS) was proposed. In laboratory, the water-quenched steel slag was melted at 1350°C to simulate the MSS. A mixture of additive powders in wt.% (55 quartz powder, 5 Na₂O, 16 emery powder, 15 CaO, 8 MgO, 1 TiO₂) were melted into liquid at 1350°C separately. Then the MSS and the molten additives were mixed homogeneously in order to obtain parent glass melt. The proportion of MSS in the melt was 50wt.%. The melt was subsequently cast, annealed, heat-treated and transformed into glass–ceramics. Their microstructure and crystallization behavior were analyzed. The samples exhibited excellent properties and displayed bulk crystallization. The major crystallized phase was diopside ((Fe₀.₃₅Al₀.₂₀Mg₀.₄₄)Ca₀.₉₆(Fe₀.₀₈Si₀.₇₀Al₀.₂₀)₂O₆.₁₂), which was uniformly distributed in the microstructure. The novel approach may help iron and steel industry achieve zero disposal of steel slag with utilization of the heat energy of the MSS.

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