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Synthesis of analcime from sericite and pyrophyllite by microwave-assisted hydrothermal processes
AbstractThis paper reports the synthesis of analcime from sericite and pyrophyllite by hydrothermal reactions. Commercial mica powders, composed of sericite and pyrophyllite, were treated by microwave-assisted hydrothermal reactions using Na2SiO3 as the mineralizer. Besides the as-received, the mica powders were ground in a beads-mill so as to obtain starting materials with different sizes. At 240°C with 0.5–5M Na2SiO3, the “as-received” and “ground” were transformed to analcime with typical trapezohedron crystal form. Pyrophyllite disappeared faster than sericite indicating that pyrophyllite is more reactive than sericite in the process of analcime synthesis. At higher concentrations of Na2SiO3, however, the two minerals eventually transformed to analcime. The synthesis of analcime from pyrophyllite was a one-way type reaction without the appearance of intermediate phases. A similar reaction also proceeded for sericite. The particle sizes of the analcime were in proportional to the starting material, i.e. the size of analcime particles can be controlled by choosing proper starting material sizes. Fine starting material size facilitates the reaction rate and the analcime synthesis can be completed in shorter times.
Graphical abstract
HighlightsTransformation of sericite and pyrophyllite by microwave-assisted hydrothermal reactions to analcime is proposed.Best mineralizers for the synthesis of analcime are: providing Na+ and SiO32− and mild alkalinity.Pyrophyllite is more reactive than sericite in the synthesis reaction.Product size is related to the size of the starting material, and can be controlled by proper treatment of the raw material.Analcime particles are almost mono-sized with very good trapezohedron form.
Synthesis of analcime from sericite and pyrophyllite by microwave-assisted hydrothermal processes
AbstractThis paper reports the synthesis of analcime from sericite and pyrophyllite by hydrothermal reactions. Commercial mica powders, composed of sericite and pyrophyllite, were treated by microwave-assisted hydrothermal reactions using Na2SiO3 as the mineralizer. Besides the as-received, the mica powders were ground in a beads-mill so as to obtain starting materials with different sizes. At 240°C with 0.5–5M Na2SiO3, the “as-received” and “ground” were transformed to analcime with typical trapezohedron crystal form. Pyrophyllite disappeared faster than sericite indicating that pyrophyllite is more reactive than sericite in the process of analcime synthesis. At higher concentrations of Na2SiO3, however, the two minerals eventually transformed to analcime. The synthesis of analcime from pyrophyllite was a one-way type reaction without the appearance of intermediate phases. A similar reaction also proceeded for sericite. The particle sizes of the analcime were in proportional to the starting material, i.e. the size of analcime particles can be controlled by choosing proper starting material sizes. Fine starting material size facilitates the reaction rate and the analcime synthesis can be completed in shorter times.
Graphical abstract
HighlightsTransformation of sericite and pyrophyllite by microwave-assisted hydrothermal reactions to analcime is proposed.Best mineralizers for the synthesis of analcime are: providing Na+ and SiO32− and mild alkalinity.Pyrophyllite is more reactive than sericite in the synthesis reaction.Product size is related to the size of the starting material, and can be controlled by proper treatment of the raw material.Analcime particles are almost mono-sized with very good trapezohedron form.
Synthesis of analcime from sericite and pyrophyllite by microwave-assisted hydrothermal processes
Hsiao, Yin-Hsiou (Autor:in) / Ho, Tsung-Yu (Autor:in) / Shen, Yun-Hwei (Autor:in) / Ray, Dahtong (Autor:in)
Applied Clay Science ; 143 ; 378-386
12.04.2017
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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