Title: Optimal thermal cycle for production of glass–ceramic based on wastes from ferronickel manufacture
Abstract: Hazardous electro-furnace slag (EFS), dust (D) and converter slag (CS) from ferronickel smelting plant were mixed with glass cullet and vitrified. The optimal heat-treatment regime for transformation of obtained glass into glass–ceramic was evaluated using fast alternative methods: the nucleation step was estimated by DTA analysis, while the crystallization step – by pycnometric measurements. Additional kinetics data, attained by non-isothermal heat-treatments at different heating rates, were also analyzed and the formed crystal phases were studied by XRD analysis. The investigated glass is easily melted (2 h at 1400 °C) and is characterized by a spontaneous tendency for bulk crystallization. In addition, due to the presence of 1.5 wt% Cr2O3 in the batch, supplementary nucleation process takes place, which is a premise for formation of fine crystalline structure and improved mechanical properties. The results elucidate that short heat-treatment at low temperatures (45–60 min nucleation at about 650 °C and 30–45 min crystallization at about 750 °C) leads to formation of mono-phase pyroxene glass–ceramic with ~50 wt% crystallinity.
Publication Year: 2015
Publication Date: 2015-11-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 34
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