Abstract
Preparation of glass ceramic foam materials from solid waste is a practicable technique that could alleviate the environmental challenges caused by solid waste and obtain products with high added value. We prepared glass ceramic foams with high porosity and high strength using electrical insulators waste and red mud as raw materials. The effect of different electrical insulators waste/red mud ratios on the pore structure, physical properties, mechanical strength, and chemical stability of the glass ceramic foams was investigated. In addition, a leaching test of heavy metal ions and multiple recycling of the prepared glass ceramic foams were analyzed. The results showed that with increasing electrical insulators waste content, the different chemical components of the waste promoted the formation of a liquid phase, the composition of which transformed from a Ca-Al-Si-O to an Al-Si-O glass system, and therefore, caused a variation in the pore structure of the glass ceramic foams. Meanwhile, the bulk density, porosity, compressive strength and acid corrosion resistance of the prepared glass ceramic foams displayed a satisfactory trend. The leaching toxicity results of the prepared glass ceramic foams revealed that the heavy metal ions were solidified by the formed glass phase during sintering. When the electrical insulators waste/red mud ratio was 8/2, the glass ceramic foams exhibited optimal comprehensive properties in the prepared samples, with a bulk density of 0.66 g/cm3, porosity of 73.6% and compressive strength of 11.3 MPa.
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