Thermal decomposition of asbestos and recycling in traditional ceramics

Gualtieri, Alessandro; Tartaglia, Andrea

doi:10.1016/s0955-2219(99)00290-3

Cited by 127 publications

(76 citation statements)

References 10 publications

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“…It has been reported by other authors an experimental characterization of as received and re-melted EAF S slag (as received slag melted and solidified again to obtain a desired shape) coming from steel production process [12,18]. TGA results shown no mass loss between 300 °C and 1200 °C under Argon, and a small mass gain when dry air is used as purge gas due to the oxidation of metal iron (3.15 %) still contained in the waste.…”

Section: Gbsmentioning

confidence: 88%

“…1b for Cofalit ® (COF), where it can be seen the refractory behavior of those ceramics and their ability to resist several thermal cycles, The obtained ACW ceramic was studied for several heat transfer fluids (HTF) commonly used in TES applications such as; molten salts, hot air, compressed hot air, oil, hot water and atmospheric steam. Results showed that only nitrates present good compatibility with this cofalit ®, the other molten salt tested didn't have promising results [10][11][12][13]. The rest of materials mentioned were compatible but more extensive studies are needed [14,15].…”

Section: Asbestos Containing Wastes (Acw)mentioning

confidence: 99%

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Industrial waste materials and by-products as thermal energy storage (TES) materials: A review

Gutiérrez

Miró

Gil

et al. 2016

AIP Conference Proceedings

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Abstract.A wide variety of potential materials for thermal energy storage (TES) have been identify depending on the implemented TES method, Sensible, latent or thermochemical. In order to improve the efficiency of TES systems more alternatives are continuously being sought. In this regard, this paper presents the review of low cost heat storage materials focused mainly in two objectives: on the one hand, the implementation of improved heat storage devices based on new appropriate materials and, on the other hand, the valorisation of waste industrial materials will have strong environmental, economic and societal benefits such as reducing the landfilled waste amounts, reducing the greenhouse emissions and others. Different industrial and municipal waste materials and by products have been considered as potential TES materials and have been characterized as such. Asbestos containing wastes, fly ashes, by-products from the salt industry and from the metal industry, wastes from recycling steel process and from copper refining process and dross from the aluminium industry, and municipal wastes (glass and nylon) have been considered. This work shows a great revalorization of wastes and by-product opportunity as TES materials, although more studies are needed to achieve industrial deployment of the idea.

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Section: Gbsmentioning

confidence: 88%

Section: Asbestos Containing Wastes (Acw)mentioning

confidence: 99%

Industrial waste materials and by-products as thermal energy storage (TES) materials: A review

Gutiérrez

Miró

Gil

et al. 2016

AIP Conference Proceedings

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“…Asbestos is the name given to a group of naturally occurring silicate minerals in the amphibole and serpentine series, possessing a fibrous habit [1,2]. Amphiboles are double-chain silicates which may assume a fibrous habit being structurally elongated in one preferred crystal direction [1][2][3] anthophyllite, where W = Na, K (trace amount) [2,4].…”

Section: Introductionmentioning

confidence: 99%

“…Amphiboles are double-chain silicates which may assume a fibrous habit being structurally elongated in one preferred crystal direction [1][2][3] anthophyllite, where W = Na, K (trace amount) [2,4]. The commercial term of riebeckite and grunerite is crocidolite and amosite, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The thermal treatment of pure chrysotile results in dehydroxylation at temperatures in the range from 500 to 800 °C and subsequent recrystallization at the high temperatures leading to the formation of forsterite and enstatite from Mg-rich and Si-rich regions, respectively [12,13]. Thermal decomposition of crocidolite and amosite has been carried out [14,15] and the possibility of recycling of thermally treated or microwave inertised asbestos and ACW is also reported [2,4,16].…”

Section: Introductionmentioning

confidence: 99%

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A novel decomposition technique of friable asbestos by CHClF2-decomposed acidic gas

Yanagisawa

Kozawa

Onda

et al. 2009

Journal of Hazardous Materials

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Asbestos was widely used in numerous materials and building products due to their desirable properties. It is, however, well known that asbestos inhalation causes health damage and its inexpensive decomposition technique is necessary to be developed for pollution prevention. We report here an innovative decomposition technique of friable asbestos by acidic gas (HF and HCl) generated from the decomposition of CHClF 2 by the reaction with superheated steam at 800 °C.Chrysotile-asbestos fibers were completely decomposed to sellaite and magnesium silicofluoride hexahydrate by the reaction with CHClF 2 -decomposed acidic gas at 150 °C for 30 min. At high temperatures beyond 400 °C, sellaite and hematite were detected in the decomposed product. In addition, crocidolite-asbestos containing wastes and amosite-asbestos containing wastes were also decomposed by CHClF 2 -decomposed acidic gas at 500 °C and 600 °C for 30 min, respectively. The observation of the reaction products by phase-contrast microscopy (PCM) confirmed that the resulting products did not contain any asbestos.

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Detoxification of Asbestos and Recovery of Valuable Metals from Detoxified Asbestos

Hong

Choi²,

Yoon

et al. 2021

Bulletin Korean Chem Soc

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Studies on detoxification of asbestos and recovery of valuable metals from detoxified asbestos were conducted. First, asbestos was detoxified by a microwave heat treatment that used silicon carbide balls, which are inorganic heating elements that absorb microwaves and release heat at room temperature. For efficient heat treatment, the asbestos containing waste (ACW) was powdered by crushing and grinding processes and then a detoxification heat treatment was performed. Microwave heat treatment temperature and time variables were adjusted to investigate the detoxification properties according to heat treatment conditions. After heat treatment, treated ACW was analyzed for detoxification properties through crystal structure and microstructure analysis using X‐ray diffraction (XRD) and scanning electron microscopy. Complete asbestos detoxification was confirmed when the microwave heat treatment was performed at 1200°C for over 60 min and at 1300°C for over 10 min. Second, recovery of valuable metals from detoxified asbestos was carried out. The main components, Si, Ca, and Mg, of detoxified asbestos‐containing waste (DACW) were separated and recovered in the form of SiO2, CaSO4, and Mg(OH)2. SiO2 was separated first after treatment of DACW with HCl. Ca in the form of sulfate, CaSO4, was recovered when subsequent treatment of remaining aqueous acid solution with H2SO4. The remaining Mg was recovered by precipitation as Mg(OH)2 form under strong basic conditions. Each separated component was confirmed by XRD and Inductively Coupled Plasma (ICP) analysis.

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Thermal decomposition of asbestos and recycling in traditional ceramics

Cited by 127 publications

References 10 publications

Industrial waste materials and by-products as thermal energy storage (TES) materials: A review

Industrial waste materials and by-products as thermal energy storage (TES) materials: A review

A novel decomposition technique of friable asbestos by CHClF2-decomposed acidic gas

Detoxification of Asbestos and Recovery of Valuable Metals from Detoxified Asbestos

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