Crystal chemistry of the high temperature product of transformation of cement-asbestos

Viani, Alberto; Gualtieri, Alessandro; Pollastri, Simone; Rinaudo, Caterina; Croce, Alessandro; Urso, Giancarlo

doi:10.1016/j.jhazmat.2012.12.030

Cited by 30 publications

(31 citation statements)

References 24 publications

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“…According to the authors, batches of cement-asbestos materials from different plants, in particular slates and undergoing the same thermal treatment, may yield different end products. This was confirmed by studies presented by Viani et al [35], in which the high-temperature inertisation product of a representative batch of previously mentioned cement-asbestos samples was characterised. The chemistry of the investigated samples is dominated by Si, Ca and Mg, although significant differences between the samples exist.…”

Section: Introductionsupporting

confidence: 80%

“…In this case lower water absorption was obtained in comparison to the reference material (2.7 vs. 3.3 %). Also, the value of open porosity was the lowest [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] MPa, thus the standard requirements are fulfilled. It should be noted that the addition of 10 wt% of cement-asbestos did not reduce the compressive strength of ceramic material as compared to the sample with 5 wt% of this waste.…”

Section: Recycling Of the Transformation Product In Clinker Brick MIXmentioning

confidence: 99%

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Utilisation of cement-asbestos wastes by thermal treatment and the potential possibility use of obtained product for the clinker bricks manufacture

et al. 2015

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The aim of this study was to investigate the thermal behaviour of cement-asbestos wastes and to determine whether it is possible to use them in the production of building ceramics, e.g. clinker bricks. In the first part of the research, the process of cement-asbestos thermal decomposition was studied. This asbestos material contained the chrysotile and crocidolite variety of asbestos. The results of this study allowed to determine the lowest temperature of thermal treatment that provides asbestos detoxification. The second part of the paper presents the results of a preliminary study on using previously calcined cement-asbestos wastes as an additive to ceramic masses typical for clinker bricks. Green compacts containing various amounts of cement-asbestos wastes were sintered and then ceramic properties were determined. The results of the study indicate that calcined asbestos-containing materials can be used as one of the secondary raw materials in the production of clinker ceramics.

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Section: Introductionsupporting

confidence: 80%

Section: Recycling Of the Transformation Product In Clinker Brick MIXmentioning

confidence: 99%

Utilisation of cement-asbestos wastes by thermal treatment and the potential possibility use of obtained product for the clinker bricks manufacture

et al. 2015

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“…Through this diagram, the chemistry of CAs can be linked to the mineralogical character of CA after thermal treatment, allowing for a correct management at the industrial scale of any hightemperature inertialization process of ACM (Viani et al 2013). …”

Section: Classification Of Casmentioning

confidence: 99%

Crystal chemistry of cement-asbestos

Viani

Gualtieri

Secco

et al. 2013

American Mineralogist

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A study of a representative number of cement-asbestos (CA) samples removed from different localities in Italy has been accomplished with a combination of analytical techniques, including XRF, XRPD, SEM/EDS, micro-Raman, and electron backscattered diffraction (EBSD), to elucidate the mineralogical and chemical variability of this class of building materials on a large scale. We describe a complex mineralogy including phases of cement hydration, residual non-hydrated components, and a relevant fraction attributed to various processes of deterioration. With the aid of the CaO-MgO-SiO2 compositional diagram, three groups of CAs have been identified on the basis of their chemical parameters. This result is important for environmental and waste management issues

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“…The preference for recycling compared to landfill disposal is specified in the European Directive [13], since recycling is the best solution, as it reduces environmental impact and the consumption of primary raw materials. In this regard, although the crystal-chemical transformation induced by the thermal treatment of asbestos is the most common transformation process [14][15][16][17][18][19][20][21][22][23], other processes such as biological treatment, dissolution by acid, thermochemical and mechano-chemical processes have been used for treating ACMs during the last two decades [24][25][26][27][28][29][30][31][32]. In particular, mechano-chemical treatment, which could be used for disposing of and/or recycling asbestos, is capable of increasing particle reactivity [33], reducing the sintering temperature [34] and reducing the thermal decomposition temperature [35,36].…”

Section: Introductionmentioning

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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Crystal chemistry of the high temperature product of transformation of cement-asbestos

Cited by 30 publications

References 24 publications

Utilisation of cement-asbestos wastes by thermal treatment and the potential possibility use of obtained product for the clinker bricks manufacture

Utilisation of cement-asbestos wastes by thermal treatment and the potential possibility use of obtained product for the clinker bricks manufacture

Crystal chemistry of cement-asbestos

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

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