Abstract
AbstractCaO–MgO–Al2O3–SiO2 glass-ceramics with diopside as the main crystalline phase were prepared by melting blast furnace slag obtained from Baotou Iron and Steel Company. The effect of heat treatment on the crystallization behavior of glass-ceramics, containing a large proportion of melted blast furnace slag, was studied by means of differential thermal analysis and scanning electron microscopy. The optimum heat-treatment regime was obtained by orthogonal experimental results for glass-ceramics in which blast furnace slag comprised 70% of the composition and 1% Cr2O3 and 4% TiO2 were used as nucleating agents. The nucleation temperature was 750°C for 2.5 h and the crystallization temperature was 930°C for 1 h. Under this regime, the performance of the glass-ceramic was better than that of other groups in the orthogonal experiment.
Highlights
The water-quenched slag of Baotou Iron and Steel Company (Inner Mongolia, China) is mainly used to produce cement and slag powder
Diopside and melilite are the main crystalline phases of glass-ceramics developed by the Turkish steel producer, Erdemir, using their blast furnace slag [4], with up to 50% of slag in the formulation
Heat treatment is a key step in the preparation of glassceramics from blast furnace slag [17,18]
Summary
The water-quenched slag of Baotou Iron and Steel Company (Inner Mongolia, China) is mainly used to produce cement and slag powder. The main chemical components of the blast furnace slag are CaO, SiO2, MgO, and Al2O3, which account for about 90% of the total slag and contain less harmful impurities [1,2] This is an ideal raw material for decorative glass-ceramics of the. Bochen [9] studied the heat treatment system of glass-ceramics from blast furnace slag of Baotou Iron and Steel Company by orthogonal test. Yang and Hanning [10] optimized the heat treatment system of glass-ceramics by means of orthogonal experiment and determined the optimum technological parameters as follows: the nucleation temperature is 840°C, holding for 1 h; the crystallization temperature is 910°C, holding for 1 h. Under the same experimental method, Xin [11] optimized the heat treatment system by orthogonal design and obtained the best technological parameters and glass-ceramics samples with good properties. The steps of the operation were as follows: batching → mixing → melting → molten glass casting → annealing → nucleating and crystallizing heat treatment → glass-ceramic
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