Research on Heat Treatment Process of Foam Glass Prepared by Titania-Bearing Blast Furnace Slag

Abstract

Foam glass insulation materials were made by using titania-bearing blast furnace slag. Heat treatment process including foaming temperature, foaming time and heating rate were studied and their parameters were determined. First of all, heat treatment process parameter was determined by single factor experiment. Second, optimum process parameters of heat treatment process were obtained by the optimization of orthogonalization procedure. The results showed that foaming temperature has a remarkable effect on sample pore structure ；Foaming time has a less effect on pore distribution but its effect on the diameter of the pore is obvious; Heating rate has a less effect on the diameter of the pore. The magtitude of impact of heat treatment on glass properties arrange in an order of foaming temperature, foaming time and heating rate. The Optimal parameters of heat treatment are that heating rate ,foaming temperature and foaming time are 12°C/min，900°C, 15min respectively ; After preheating, sintering, foaming and foam stability and annealing heat treatment process, an amorphous foam glass with uniform pore size was obtained. Its thermal conductivity coefficient, the bulk density, compressive strength and average diameter are 0.131w / m ∙ k, 445.8 kg/m3, 2.8MPa, 4.78mm respectively. This kind of material can be widely used in building, chemical and shipbuilding industry as thermal insulation, sound absorption, corrosion-resistant and floating materials. Titania-bearing blast furnace slag is solid waste generated from vanadium-titanium magnetite by the blast furnace smelting, which is accumulated without being utilized. At present, Titania-bearing blast furnace slag is mainly used for cement concrete admixture, preparation of photocatalytic materials, extraction of titanium dioxide etc [1-2].Foam glass has been playing a more important role in low-temperature thermal insulation and moisture-proof anticorrosive projects field, and getting more economic benefits in energy saving and technology field. At present, the stuff for preparing foam glass is solid waste including waste glass, fly ash, slag, or natural minerals such as ash, mica, perlite etc. Foaming agent is usually selected from Carbon and carbonate [3-6]. In this paper, foam glass insulation materials were made by using titania-bearing blast furnace slag-based stuff. The effect of heat treatment process on foam glass performance was studied in a bid to find a new way to utilize titania-bearing blast furnace.