Mechanochemical treatment to recycling asbestos-containing waste

Plescia, P.; Gizzi, D.; Benedetti, Silvia; L, Camilucci; Fanizza, Carla; Simone, Paolo De; Paglietti, Federica

doi:10.1016/s0956-053x(02)00156-3

Cited by 97 publications

(46 citation statements)

References 6 publications

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“…In this regard, Suquet [37] has shown that grinding and/or leaching pre-treatment of chrysotile affected its dissolution in water. A mechano-chemical treatment was also successfully applied to asbestos by Plescia et al [38], who showed how grinding can completely modify the fibrous morphology of asbestos.…”

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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Section: Introductionmentioning

confidence: 99%

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

2018

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“…In the literature there are several reports about possible utilisation methods of asbestos-containing materials which generally describe the destruction of the asbestos fibrous structure by dissolution in an acidic environment [9][10][11][12], melting and subsequent solidification [13][14][15], amorphisation by mechanochemical techniques [16,17], or by biological method [18]. Asbestos-containing wastes can also be subject to classic heat treatment (calcination, annealing) at a sufficiently high temperature, providing thermal decomposition of asbestos minerals.…”

Section: Introductionmentioning

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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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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“…The methods which are able to change the harmful properties of asbestos minerals through the destruction of the fibrous structure should be considered. Dissolution in acids [4,[12][13][14][15][16][17], hydrothermal treatment [18,19], mechanochemical treatment with high-energy milling process [20], fiber melting and vitrification with fluxes or the use of plasma technology [21,22] are the main among the described methods in technical literature.…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition of different types of asbestos

Kusiorowski

Zaremba

Piotrowski

et al. 2012

J Therm Anal Calorim

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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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Mechanochemical treatment to recycling asbestos-containing waste

Cited by 97 publications

References 6 publications

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

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

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

Thermal decomposition of different types of asbestos

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