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Reactivity of Chrysotile Asbestos in Acids: Mechanism of Transformation to Silicon Dioxide Hemihydrate Upon Leaching of Magnesium

Published online by Cambridge University Press:  15 February 2011

Anne Vaillancourt ,
Georges Denes  and
Raymond Le Van Mao
Anne Vaillancourt
Affiliation:
laboratory of Solid State Chemistry and Mössbauer spectroscopy, Laboratories for Inorganic Materials, Department of Chemistry and Biochemistry, Concordia University, Montreal, Quebec, H3G 1M8, Canada, gdenes@vax2.concordia.ca Catalysis Laboratory, Laboratories for Inorganic Materials, Department of Chemistry and Biochemistry, Concordia University, Montreal, Quebec, H3G 1M8, Canada, gdenes@vax2.concordia.ca
Georges Denes
Affiliation:
laboratory of Solid State Chemistry and Mössbauer spectroscopy, Laboratories for Inorganic Materials, Department of Chemistry and Biochemistry, Concordia University, Montreal, Quebec, H3G 1M8, Canada, gdenes@vax2.concordia.ca
Raymond Le Van Mao
Affiliation:
Catalysis Laboratory, Laboratories for Inorganic Materials, Department of Chemistry and Biochemistry, Concordia University, Montreal, Quebec, H3G 1M8, Canada, gdenes@vax2.concordia.ca
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Abstract

Acid leaching chrysotile asbestos results in a stepwise loss of magnesium which reduces the strain locally. This results in a partial unwiding of the structural sheets which makes possible further leaching. Strong acids are used for a coarse brutal attack of the chrysotile structure, whereas weak acids allow a fine control of the magnesium leaching degree required to have the adequate properties of the partially leached asbestos which is used for the preparation of zeolites with enhanced catalytic properties. The final material is not carcinogenic. The leached materials were characterized by atomic absorption spectrometry, bulk density and BET specific surface area measurements, and X-ray diffraction.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 453: Symposium R – Solid State Chemistry of Inorganic Materials , 1996 , 71
Copyright
Copyright © Materials Research Society 1997

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References

REFERENCES

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