Study on Sulfide Oxidation in a Clay Matrix by the Hyphenated Method

first_pagesettingsOrder Article Reprints Open AccessArticle Study on Sulfide Oxidation in a Clay Matrix by the Hyphenated Method by Eulalia Zumaquero *ORCID,Jessica Gilabert,Eva María Díaz-CanalesORCID,María Fernanda Gazulla andMaría Pilar Gómez-Tena Instituto de Tecnología Cerámica, Asociación de Investigación de las Industrias Cerámicas, Universitat Jaume I, 12006 Castellón, Spain * Author to whom correspondence should be addressed. Minerals 2021, 11(10), 1121; https://doi.org/10.3390/min11101121 Received: 21 September 2021 / Revised: 5 October 2021 / Accepted: 9 October 2021 / Published: 13 October 2021 (This article belongs to the Section Clays and Engineered Mineral Materials) Download Browse Figures Review Reports Versions Notes Abstract The requirement of a ceramic product with high technical and aesthetic performance makes it necessary to select and control raw materials to avoid losses caused by low-quality products. Many defects have their origin in impurities present in clay minerals such as sulfides and sulfates. It is important to study the oxidation, decomposition, and pyrolysis reactions that affect these minerals and their dependence on environment conditions (humidity and temperature) during the extraction and beneficiation of clay minerals in an open pit mine. The development of hyphenated techniques coupling mass spectrometry with a thermal analysis instrument provides information that is not available from either technique alone, such as decomposition behavior and the determination of emissions with a lower limit of detection. The evolution of sulfur dioxide from the oxidation of different sulfides provides information on the in situ oxidation and decomposition reactions that happen when a thermal treatment is applied. The results obtained show important differences in the reactions that take place in sulfides when they are stored under different environmental conditions. Specifically, the general tendency is that the sulfurs stored under high relative humidity show a decrease in the ...