Thermal behaviour of mineral fibres

Bloise, Andrea; Kusiorowski, Robert; Gualtieri, Magdalena Lassinantti; Gualtieri, Alessandro F.

doi:10.1180/emu-notes.18.7

Cited by 16 publications

(25 citation statements)

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“…Finally, the occurrence of antigorite is confirmed by the endothermic peak in a T range of 770-790 °C ( Table 2). The TG data reported on Table 3, show the values of 1-4% mass loss at a temperature up to 110 °C due to the adsorbed water and total weight losses of about 12-18% up to 1000 °C in all of the samples, The TG data reported on Table 3, show the values of 1-4% mass loss at a temperature up to 110 • C due to the adsorbed water and total weight losses of about 12-18% up to 1000 • C in all of the samples, mainly due to the breakdown of serpentine minerals according to the literature data [44,45]. Some samples have high values of total water loss at 1000 • C (i.e., 18%) due to two reasons: (i) presence of other hydrated minerals in addition to the serpentine polymorphs (Table 1); and (ii) the presence of water (physically bound) trapped between the fibrous bundles of chrysotile [46].…”

Section: Thermal Analysis Characterizationsupporting

confidence: 61%

Assessment of Serpentine Group Minerals in Soils: A Case Study from the Village of San Severino Lucano (Basilicata, Southern Italy)

Punturo

Ricchiuti

Bloise

2019

Fibers

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Naturally occurring asbestos (NOA) is a generic term used to refer to both regulated and un-regulated fibrous minerals when encountered in natural geological deposits. These minerals represent a cause of health hazard, since they have been assessed as potential environmental pollutants that may occur both in rocks and derived soils. In the present work, we focused on the village of San Severino Lucano, located in the Basilicata region (southern Apennines); due to its geographic isolation from other main sources of asbestos, it represents an excellent example of hazardous and not occupational exposure of population. From the village and its surroundings, we collected eight serpentinite-derived soil samples and carried out Differential Scanning Calorimetry (DSC), Derivative Thermogravimetric (DTG) and Transmission Electron Microscopy with Energy Dispersive Spectrometry (TEM-EDS), in order to perform a detailed characterization of serpentine varieties and other fibrous minerals. Investigation pointed out that chrysotile and asbestos tremolite occur in all of the samples. As for the fibrous but non-asbestos classified minerals, polygonal serpentine and fibrous antigorite were detected in a few samples. Results showed that the cultivation of soils developed upon serpentinite bedrocks were rich in harmful minerals, which if dispersed in the air can be a source of environmental pollution.

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Section: Thermal Analysis Characterizationsupporting

confidence: 61%

Assessment of Serpentine Group Minerals in Soils: A Case Study from the Village of San Severino Lucano (Basilicata, Southern Italy)

Punturo

Ricchiuti

Bloise

2019

Fibers

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“…In chrysotile and amosite, grinding treatment for 5 and 10 min produced a decrease in endothermic effects due to easier dehydroxylation from strongly altered structures. The decomposition of amosite followed a very similar pattern to crocidolite although in this case the formation of oxy-amosite (anhydrous amosite) involved a dehydroxylation process as well as a dehydrogenation process that occur simultaneously [52], and thus, it was not possible to identify oxy-amosite by the dehydroxylation peak on the DSC curve. In fact, crocidolite may be unique amongst the asbestos amphiboles in that the dehydroxylation process, and the structural breakdown process were consecutive rather than concurrent [52].…”

Section: Discussionmentioning

confidence: 97%

“…After 5 min of grinding, the structure of chrysotile collapsed at a lower temperature as shown by the endothermic peak at 625 • C, which shifted downward to 622 • C becoming weaker in the sample ground for 10 min (Figure 4). The exothermic peaks on the DSC curves (822, 818 and 810 • C) indicate forsterite (Mg 2 SiO 4 ) and enstatite (MgSiO 3 ) crystallization (e.g., [46,52]). Forsterite (JCPDS card 34-0189) and enstatite (JCPDS card 22-0714) were identified by XRPD as the main crystalline phases formed after combined grinding for 30 s, 5 and 10 min and thermal treatments at 1000 • C (Supplementary Figure S1).…”

Section: Chrysotilementioning

confidence: 99%

Effect of Grinding on Chrysotile, Amosite and Crocidolite and Implications for Thermal Treatment

2018

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Nowadays, due to the adverse health effects associated with exposure to asbestos, its inertization is one of the most important issues of waste risk management. Based on the research line of mechano-chemical and thermal treatment of asbestos containing materials, the aim of this study was to examine the effects of dry grinding on the structure, temperature stability and fibre size of chrysotile from Balangero (Italy), as well as standard UICC (Union for International Cancer Control) amosite and standard UICC (Union for International Cancer Control) crocidolite. Dry grinding was accomplished in an eccentric vibration mill by varying the grinding time (30 s, 5 and 10 min). Results show a decrease in crystallinity, the formation of lattice defects and size reduction with progressive formation of agglomerates in the samples after the mechanical treatment. Transmission electron microscopy (TEM) results show that the final product obtained after 10 min of grinding is composed of non-crystalline particles and a minor residue of crystalline fibres that are not regulated because they do not meet the size criteria for a regulated fibre. Grinding results in a decrease of temperature and enthalpy of dehydroxylation (∆H dehy ) of chrysotile, amosite and crocidolite. This permits us to completely destroy these fibres in thermal inertization processes using a lower net thermal energy than that used for the raw samples.

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“…Other elements are also detected in serpentine minerals such as Ti, Cr, (Figure 4), which represent an almost exclusively isomorphous substitution of Mg [53].…”

Section: Resultsmentioning

confidence: 99%

Multi-Analytical Approach for Identifying Asbestos Minerals In Situ

Bloise

Miriello

2018

Geosciences

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An innovative and, as yet, untested approach is to analyze serpentinite and metabasite rocks containing asbestos using a portable multi-analytical device, which combines portable digital microscopy (p-DM), portable X-ray Fluorescence (p-XRF) and portable micro-Raman Spectroscopy (p-µR). The analyses were carried out in two inactive quarries of serpentinitic and metabasitic rocks from the Gimigliano-Mount Reventino Unit (Southern Italy) already characterized in previous studies, with the aim of testing the efficiency of these portable tools. In this study, a portable X-ray fluorescence analyzer was used to obtain the in situ rapid chemical discrimination of serpentinite and metabasite rocks. The characterization of outcropping rocks using portable devices enabled us to detect the presence of chrysotile and asbestos tremolite. The results obtained were consistent with the findings from previous research studies and therefore combining p-DM, p-XRF and p-µR could be a useful approach for discriminating asbestos contained in outcropping rocks, especially when sampling is prohibited or for field-based sampling.

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Thermal behaviour of mineral fibres

Cited by 16 publications

References 0 publications

Assessment of Serpentine Group Minerals in Soils: A Case Study from the Village of San Severino Lucano (Basilicata, Southern Italy)

Assessment of Serpentine Group Minerals in Soils: A Case Study from the Village of San Severino Lucano (Basilicata, Southern Italy)

Effect of Grinding on Chrysotile, Amosite and Crocidolite and Implications for Thermal Treatment

Multi-Analytical Approach for Identifying Asbestos Minerals In Situ

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