Green process for the chemical conversion of an industrial waste into useful materials

Abstract : This study is devoted to the chemical conversion of an industrial waste issued from sulphate route of titanium dioxide production or surface treatment of steel, into a useful added value material. The considered waste is iron sulphate (FeSO4·7H2O). The products of the chemical conversion process are the alkali ferrates (A2FeVIO4, A = Na, K) containing iron in an unusual hexavalent state. Obtained ferrate salts possess appropriate properties useful for cleaning water, wastewater and industrial effluents. This proposed process is based on two steps: (i) the first step consists in the pre-mixing AOH with FeSO4·xH2O in a rotary reactor allowing to coat iron sulphate in the alkali hydroxide through solid-solid reactions; and (ii) the second step is devoted to the synthesis of the alkali ferrates in fluidized bed by oxidation in diluted chlorine of the solid obtained in the first step. Materials used consist of a great number of the industrial iron sulphate samples, alkali hydroxides (KOH and NaOH) as well as gaseous chlorine diluted by nitrogen and/or air. The chemical synthesis of the alkali ferrates can be carried out within few minutes. Using fluidised bed enhanced the energy and mass transfer allowing a quasi-perfect control of the ferrate synthesis process. The FeVI efficiency oscillates between 30 % and 55 % depending on the experimental parameters. A comparison of ferrates synthesis process with principles of the “green chemistry” suggests that numerous points such as: prevention, atom economy, less hazardous chemical synthesis, design for energy efficiency, lead to consider this process as “green chemistry”.
Type de document :
Communication dans un congrès
5th International Conference on Engineering for Waste and Biomass Valorisation, 2014, Rio de Janeiro, Brazil. pp. 1810-1825, 2014, Proceedings of WasteEng'14
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https://hal.univ-lorraine.fr/hal-01511221
Contributeur : Ndue Kanari <>
Soumis le : jeudi 20 avril 2017 - 15:30:50
Dernière modification le : mardi 29 mai 2018 - 12:51:03

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Ndue Kanari, Etleva Ostrosi, Cécile Diliberto, Inna Filippova, Frédéric Diot, et al.. Green process for the chemical conversion of an industrial waste into useful materials. 5th International Conference on Engineering for Waste and Biomass Valorisation, 2014, Rio de Janeiro, Brazil. pp. 1810-1825, 2014, Proceedings of WasteEng'14. 〈hal-01511221〉

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