TEM study of mullite growth after muscovite breakdown

Comprehensive characterization of anthracite fly ash from a thermo-electric power plant and its potential environmental impact

“…Reifenstein et al (1999) indicate that mullite begins to form from illite in coal at around 1050°C, but dissolves in an evolving molten glass phase at around 1400°C. Rodriguez-Navarro et al (2003) suggest that the process begins at a slightly lower temperature (900-1000°C), involving partial melting combined with coincident crystallization of the mullite phase. French et al (2001) indicate a similar temperature for mullite formation from kaolinite, based on high-temperature XRD studies.…”

The low-pressure partial-melting behaviour of natural boron-bearing metapelites from the Mt. Stafford area, central Australia

“…Mullite (Mul) formation after high-T muscovite (Ms) breakdown has been noted and studied by Rodriguez-Navarro et al (2003) in phyllosilicate-rich bricks. At T 900 °C Ms de-hydroxylation is followed by partial melting that triggers the nucleation and growth of acicular mullite crystals.…”

Evolution of product phase assemblages during thermal decomposition of muscovite under strong disequilibrium conditions

“…Muscovite being a common accessory mineral in the ceramic products, its low-pressure and high-T transformations strongly infl uence the fi ring properties of ceramic products (Sundius and Byström 1953;MacKenzie et al 1987; Barlow and Manning 1999;Cultrone et al 2001;Rodriguez-Navarro et al 2003). Muscovite is fully decomposed at T ≈ 980 °C (e.g., Roy 1949), and is transformed as the T increases into a wide range of mineralogical assemblages including a cubic oxide phase, corundum, mullite, leucite, K-feldspars, tridymite, and glass (Roy 1949;Sundius and Byström 1953;Brindley and Maroney 1960;Eberhart 1963;MacKenzie et al 1987;Brindley and Lemaître 1987; Barlow and Manning 1999;Cultrone et al 2001;Rodriguez-Navarro et al 2003).…”

“…Muscovite is fully decomposed at T ≈ 980 °C (e.g., Roy 1949), and is transformed as the T increases into a wide range of mineralogical assemblages including a cubic oxide phase, corundum, mullite, leucite, K-feldspars, tridymite, and glass (Roy 1949;Sundius and Byström 1953;Brindley and Maroney 1960;Eberhart 1963;MacKenzie et al 1987;Brindley and Lemaître 1987; Barlow and Manning 1999;Cultrone et al 2001;Rodriguez-Navarro et al 2003). The cubic oxide phase was variously reported as "spinel," "Al-Si spinel," or γ-Al 2 O 3 , and its structure and chemistry have been strongly debated from many standpoints (Roy 1949;Sundius and Byström 1953;Brindley and Maroney 1960;Eberhart 1963;Brindley and Lemaître 1987).…”