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- W194980875 abstract "ABSTRACT Microcrystalline silicon dioxide has been prepared from a cheap and abundant natural resource of Quebec, namely chrysotile asbestos, Mg3Si2O7. 2H2O, upon acid-leaching to remove magnesium. Leaching also destroys the fibrous texture of the materials, which thereby results in a non-carcinogenic final product called “Alix”. Leaching kinetics is a function of time, acid concentration, and temperature. Below a magnesium leaching degree (MLD) of 55%, the Alix materials still show the fibrous morphology of the parent asbestos. Above 55% MLD, there is a fast decrease of the degree of crystallinity and bulk density together with a rapid morphological degradation of the fibers. The final Alix is a highly porous material with a unusually high active surface area. This, combined with its high hydrophobicity, makes it an attractive candidate as a source of SiO2 and a matrix for the synthesis of low Al content ZSM5 zeolites with wide applications as catalysts in petrochemistry and as absorbents." @default.
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- W194980875 date "1988-01-01" @default.
- W194980875 modified "2023-09-23" @default.
- W194980875 title "Magnesium leaching of asbestos chrysotile as a new synthetic route to microcrystalline silicon dioxide" @default.
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- W194980875 doi "https://doi.org/10.1016/b978-0-08-036448-3.50064-5" @default.
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