Devulcanization and Demineralization of Used Tire Rubber by Thermal Chemical Methods: A Study by X-ray Diffraction
| Autor: | C. Fernández-González, Vicente Gómez-Serrano, J. M. Palacios Latasa, María Alexandre-Franco, M. Alfaro-Domínguez |
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| Rok vydání: | 2010 |
| Předmět: |
inorganic chemicals
chemistry.chemical_classification Aqueous solution Sulfide Chemistry General Chemical Engineering Energy Engineering and Power Technology Mineralogy chemistry.chemical_element Sulfur Demineralization Chemical species Fuel Technology Chemical engineering Natural rubber visual_art parasitic diseases X-ray crystallography visual_art.visual_art_medium Chemical composition |
| Zdroj: | Energy & Fuels. 24:3401-3409 |
| ISSN: | 1520-5029 0887-0624 |
| Popis: | The use of novel methods for the devulcanization and demineralization of used tire rubber (UTR) based on the thermal chemical treatment of this material with LiCl−KCl, LiCl−KCl−KOH, or KOH at relatively low temperatures is investigated. The influence of composition of the reactive system, ratio of reactants to UTR, and maximum heat treatment temperature (i.e., 300, 400, or 500 °C) is studied. For comparison purposes, a HNO3 solution is also used. The changes produced in the chemical composition of UTR as a result of the devulcanization and demineralization processes are studied by X-ray diffraction. Sulfur of UTR usually transforms into a metal sulfide or a variety of sulfur chemical species [i.e., Na2Zn(S2O4)·H2O, KAl(SO4)2, etc.] depending upon the composition of the reactive system. A combination of the treatments of UTR with LiCl−KCl, LiCl−KCl−KOH, or KOH and with HNO3 in aqueous solution is more effective to reduce the ash content in the resultant products. The most promising results are obtained whe... |
| Databáze: | OpenAIRE |
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