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Hydrothermal process development for the treatment of asbestos containing waste

Abstract : In France, the maximum industrial production of asbestos was 150 000t.year-1 between 1973 and 1975. In France, there are currently two types of waste management for waste containing asbestos: landfilling and vitrification by plasma torch. With the storage of thousand tons waste by year, most sites will be soon saturated. Despite its performance, the vitrification process is energetically expensive. Nowadays hydrothermal process is a mature technology used for the treatment of organics wastes, for instance by wet air oxidation. However, its application for mineral waste treatment is not developed, because technical difficulties. Ball and Taylor (1961) realised the first study on chrysotile denaturation by hydrothermal process. Sigon et al (2006) claimed a patent for degradation of asbestos in non-hazardous material by using supercritical water as only reagent. Finally, Anastasiadou et al (2010) established the hydrothermal conversion of chrysotile into forsterite in supercritical condition (temperature 700°C and pressure 2.4MPa) during 1h. Due to the presence of the mineral phase, it is necessary to reach high temperature. The objective is either to degradate the organic phase (glue for instance) and to change the morphologic form as well as the crystalline phase of asbestos. An example is given in equation 1 for chrysolite.
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Christ Nzogo Metoule, Stéphane Delaby, Jean-Henry Ferrasse, Olivier Boutin. Hydrothermal process development for the treatment of asbestos containing waste. NAXSOS 2018, 6th International Conference on Sustainable Solid Waste Management, Jun 2018, Naxsos island, Greece. ⟨hal-02116857⟩

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