Cordierite glass-ceramics prepared by multi-wastes

Abstract

Glass-ceramics is prepared by selecting a suitable temperature system to heat the basic glass and controlling the temperature and time of nucleation and crystallization. Cordierite (2MgO·2Al2O3·5SiO2) belongs to the MgO-Al2O3-SiO2 series of glass-ceramics, which has excellent thermal shock resistance, excellent chemical stability, low thermal expansion, low dielectric constant, low dielectric loss, and low thermal conductivity. Because glass-ceramics have a variety of excellent properties, this technology, which has seen extensive development and application across numerous domains, holds significant untapped potential. Converting industrial slag and metallurgical waste into glass ceramics presents a novel strategy for the comprehensive recycling of solid waste. Among various industrial waste slags, coal gangue is the most prevalent of China’s industrial solid waste. Utilizing inexpensive coal gangue slag as a primary ingredient for producing high value-added glass ceramics can diminish pollution, safeguard the environment, and yield considerable economic and social advantages. This study utilizes coal gangue, high carbon chromium iron slag, and iron tailings as the main components, employing the fundamental attributes of sintering testing equipment to create samples of cordierite glass-ceramics. The impact of the basic glass mass, molding pressure, and duration of pressure application on the crystallinity and grain size of the glass-ceramics were evaluated using X-ray diffraction analysis. Findings indicate the optimal combination to be a basic glass powder mass of 6 grams, a molding pressure of 35 MPa, and a holding time of 10 minutes.