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Minerals 2016, 6(3), 64; https://doi.org/10.3390/min6030064

The Transformation of Coal-Mining Waste Minerals in the Pozzolanic Reactions of Cements

1
Dpto de Geología y Geoquímica, Unidad Asociada CSIC-UAM, Universidad Autónoma de Madrid, 28049 Madrid, Spain
2
Dpto de Geografía, Unidad Asociada CSIC-UAM, Universidad Autónoma de Madrid, 28049 Madrid, Spain
3
Eduardo Torroja Institute (CSIC), Spanish National Research Council, 28033 Madrid, Spain
*
Author to whom correspondence should be addressed.
Academic Editors: Shifeng Dai, Xibo Wang and Lei Zhao
Received: 22 January 2016 / Revised: 2 June 2016 / Accepted: 22 June 2016 / Published: 30 June 2016
(This article belongs to the Special Issue Minerals in Coal)
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Abstract

The cement industry has the potential to become a major consumer of recycled waste materials that are transformed and recycled in various forms as aggregates and pozzolanic materials. These recycled waste materials would otherwise have been dumped in landfill sites, leaving hazardous elements to break down and contaminate the environment. There are several approaches for the reuse of these waste products, especially in relation to clay minerals that can induce pozzolanic reactions of special interest in the cement industry. In the present paper, scientific aspects are discussed in relation to several inert coal-mining wastes and their recycling as alternative sources of future eco-efficient pozzolans, based on activated phyllosilicates. The presence of kaolinite in this waste indicates that thermal treatment at 600 °C for 2 h transformed these minerals into a highly reactive metakaolinite over the first seven days of the pozzolanic reaction. Moreover, high contents of metakaolinite, together with silica and alumina sheet structures, assisted the appearance of layered double hydroxides through metastable phases, forming stratlingite throughout the main phase of the pozzolanic reaction after 28 days (as recommended by the European Standard) as the reaction proceeded. View Full-Text
Keywords: metakaolinite; micas; coal-mining waste; LDH (layered double hydroxides); pozzolanic reaction metakaolinite; micas; coal-mining waste; LDH (layered double hydroxides); pozzolanic reaction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Giménez-García, R.; Vigil de la Villa Mencía, R.; Rubio, V.; Frías, M. The Transformation of Coal-Mining Waste Minerals in the Pozzolanic Reactions of Cements. Minerals 2016, 6, 64.

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