Study on the thermal decomposition of chrysotile asbestos

Zaremba, T.; Krząkała, A.; Piotrowski, J.; Garczorz, D

doi:10.1007/s10973-010-0819-4

Cited by 54 publications

(33 citation statements)

References 21 publications

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“…However, the shapes of the DTG curves for chrysotile vary considerably between authors (e.g. Naumann and Dresher 1966;Viti 2010;Zaremba et al 2010), which makes it difficult to compare the different datasets. In general, such variability in thermoanalytical data of phyllosilicates is common and caused by physical and chemical properties specific to each sample, e.g.…”

Section: Resultsmentioning

confidence: 99%

Kinetics of the chrysotile and brucite dehydroxylation reaction: a combined non-isothermal/isothermal thermogravimetric analysis and high-temperature X-ray powder diffraction study

2013

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a much higher apparent E a characterised by an initial stage of around 290 kJ/mol. Afterwards, the apparent E a comes down to around 250 kJ/mol at α ~ 65 % before rising up to around 400 kJ/mol. The delivered kinetic data have been investigated by the z(α) master plot and generalised time master plot methods in order to discriminate the reaction mechanism. Resulting data verify the multi-step reaction scenarios (reactions governed by more than one rate-determining step) already visible in E a versus α plots.Keywords Serpentine dehydroxylation · Generalised master plot · Chrysotile · Brucite · Thermogravimetry · In situ high-temperature X-ray powder diffraction

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Section: Resultsmentioning

confidence: 99%

Kinetics of the chrysotile and brucite dehydroxylation reaction: a combined non-isothermal/isothermal thermogravimetric analysis and high-temperature X-ray powder diffraction study

2013

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“…Each type of asbestos has different physical characteristics. Generally, asbestos fibers are characterized by flexibility, high-tensile strength, large surface area, incombustibility, abrasion resistance, and resistance to acids and bases [6][7][8]. Chrysotile fibers are extremely thin and are flexible and soft, which can provide weaving.…”

Section: Introductionmentioning

confidence: 99%

“…The most dangerous are respirable fibers, which can penetrate deeply into the respiratory system, from where they are not easily removable by the simple natural cleansing mechanisms. These fibers have a length greater than 5 lm, a diameter of less than 3 lm, and a length to diameter ratio above 3:1 [7]. Carcinogenic activity of asbestos was the reason for including these minerals in a list of hazardous materials.…”

Section: Introductionmentioning

confidence: 99%

“…Similar to the clay minerals [29,30], thermal decomposition of asbestos minerals generally takes place according to three stages [7,31]. The first is associated with the loss of adsorbed water.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of chrysotile asbestos [Mg 3 (OH) 4 Si 2 O 5 ], which was the most abundant and most widely investigated, results reported in several studies [6,7,[32][33][34][35][36] show that chrysotile with the loss of chemical combined water transforms into an anhydrous phase (metachrysotile) around 500-750°C (with a maximum rate above 700°C). Rapid recrystallization of anhydrous phase occurs after this stage at above 800°C.…”

Section: Introductionmentioning

confidence: 99%

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Thermal decomposition of different types of asbestos

Kusiorowski

Zaremba

Piotrowski

et al. 2012

J Therm Anal Calorim

Self Cite

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Given the known carcinogenic effects, asbestos minerals are considered as general health hazard. Therefore, the elimination of asbestos materials from the environment is necessary. Asbestos minerals should be entirely transformed to a non-hazardous material. One of these methods is destructing the fibers structure of asbestos minerals by thermal treatment. Asbestos minerals are naturally occurring hydrous silicates, so that they decompose to release water by heating at high temperatures which may lead to changes in crystal structure and the formation of new phases without the dangerous properties. In this article, thermal behavior of asbestos minerals is investigated to observe the disappearance of this hazardous structure and to characterize products obtained by this way. Ten samples of asbestos minerals (six chrysotile samples from different locations, two samples of crocidolite, one amosite, and one tremolite) from different locations were tested. Mineralogical and morphological data (X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy) were obtained before and after differential thermal analysis.

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Serpentine and Amphibole Asbestos [A Subset of Elongated Mineral Particles (EMPs)]

“Tony” Havics,

Bernstein

2024

Patty's Toxicology

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The term asbestos refers to two very different minerals, serpentine and amphibole, occurring in fibrous form with very different mineralogical properties. Unfortunately, the term “asbestos” has been used loosely when, in fact, it has always been appropriate to discuss them separately. This chapter focuses on the key essential differences which result in very different toxicological and epidemiological responses to the fibers from these two minerals. In particular, it is discussed how a fiber's potency dictates the health risk, how the fiber's mineralogy affects biopersistence in the lung, and how fiber length determines how the lung responds to this characteristic. The differential toxicology is presented, as well as the epidemiology of these fibrous minerals. The regulations in the United Stated are also discussed. It is now convenient to use the term asbestos to describe a subset of elongated mineral particles (EMPs). Although the term has been discussed with potential differing definitions depending on the authors' purpose from 1979 to 2023, a popular working definition for EMPs is any mineral particle with a minimum aspect ratio of 3:1. This chapter will focus on the asbestos subset.

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Study on the thermal decomposition of chrysotile asbestos

Cited by 54 publications

References 21 publications

Kinetics of the chrysotile and brucite dehydroxylation reaction: a combined non-isothermal/isothermal thermogravimetric analysis and high-temperature X-ray powder diffraction study

Kinetics of the chrysotile and brucite dehydroxylation reaction: a combined non-isothermal/isothermal thermogravimetric analysis and high-temperature X-ray powder diffraction study

Thermal decomposition of different types of asbestos

Serpentine and Amphibole Asbestos [A Subset of Elongated Mineral Particles (EMPs)]

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