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The changes of properties of fibrous silicates under the influence of physicochemical factors

Katarzyna Makowska

Abstract

Devised a simple and effective method of disposal of chrysotile asbestos fibres using chemical methods which do not damage chrysotile fibre structure based on the reactions using various acids - H2SO4, H3PO4, HNO3, HCl and CH3COOH. The next stage of this work was to verify whether there can be identified asbestos fibres in the new product after the extraction of magnesium. For this purpose samples, containing originally chrysotile, were subjected to microscopic analyses with the use of polarized light microscopy (PLM) and X-ray diffraction analyses (XRD) after 2400-hour incubation with acids. The study explicitly excluded the presence of chrysotile asbestos fibres in the analysed samples which confirms the effectiveness of the method. The final stage of the study was to compare the properties of chrysotile with the properties of the newly received product. This material has lighter colour, shorter fibres and smaller bulk density. However, the new material remains the fibrous structure and other characteristics of asbestos such as: thermal and chemical resistance as well as the sorption properties. These properties were improved in comparison with the original material. These analyses confirmed that the new material is not asbestos, and thus regulations do not apply to the use of this material allowing to use the new material in practice.
Record ID
UAMa5f7b4b754644f34b0f14153eb4405b4
Diploma type
Doctor of Philosophy
Author
Title in Polish
Zmiany właściwości włóknistych krzemianów pod wpływem czynników fizykochemicznych
Title in English
The changes of properties of fibrous silicates under the influence of physicochemical factors
Language
pol (pl) Polish
Certifying Unit
Wydział Chemii [nowa struktura organizacyjna] (SNŚ/WC)
Scientific discipline (2.0)
6.5 chemical sciences
Status
Finished
Year of creation
2015
Defense Date
20-02-2015
Title date
20-02-2015
Supervisor
URL
http://hdl.handle.net/10593/12721 Opening in a new tab
Keywords in English
asbestos, chrysotile, disposal
Abstract in English
Devised a simple and effective method of disposal of chrysotile asbestos fibres using chemical methods which do not damage chrysotile fibre structure based on the reactions using various acids - H2SO4, H3PO4, HNO3, HCl and CH3COOH. The next stage of this work was to verify whether there can be identified asbestos fibres in the new product after the extraction of magnesium. For this purpose samples, containing originally chrysotile, were subjected to microscopic analyses with the use of polarized light microscopy (PLM) and X-ray diffraction analyses (XRD) after 2400-hour incubation with acids. The study explicitly excluded the presence of chrysotile asbestos fibres in the analysed samples which confirms the effectiveness of the method. The final stage of the study was to compare the properties of chrysotile with the properties of the newly received product. This material has lighter colour, shorter fibres and smaller bulk density. However, the new material remains the fibrous structure and other characteristics of asbestos such as: thermal and chemical resistance as well as the sorption properties. These properties were improved in comparison with the original material. These analyses confirmed that the new material is not asbestos, and thus regulations do not apply to the use of this material allowing to use the new material in practice.
Thesis file
  • File: 1
    Praca doktorska Katarzyna Makowska.pdf
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Uniform Resource Identifier
https://researchportal.amu.edu.pl/info/phd/UAMa5f7b4b754644f34b0f14153eb4405b4/
URN
urn:amu-prod:UAMa5f7b4b754644f34b0f14153eb4405b4

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