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Open AccessBook Chapter10.1520/stp156520120217

Crystalline Silica in Quartz Agglomerates: A Study of Bulk Materials and an Evaluation of the Respirable Levels in Workplace Atmospheres

Pablo Fernández Rodríguez,V. Díaz Huerta,J. Madera García,David Martínez‐Blanco,J.A. Blanco-2013-12-18
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TL;DRAbstract

An increasing number of cases of silicosis have been diagnosed in Spain in the last few years, reversing the trend of previous decades. Most cases have been found in marble masons because of the exponential growth in the use of quartz agglomerates as substitutes of marble. Quartz agglomerates are synthetic materials containing mainly quartz, but also other silica polymorphs (cristobalite and tridymite), which are considered more pernicious than quartz. The presence of different polymorphs of silica implies the need for x-ray diffraction (XRD) analysis for these to be distinguished, not only in bulk materials but also in respirable fractions from workplace atmospheres, as different threshold-limit values (TLVs) are established by Spanish legislation. For analysis of manufactured products, the Rietveld method allows the quantification of the mineral phases present in bulk materials from good-quality data obtained by XRD without the use of standards. Although it is known that high silica

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An increasing number of cases of silicosis have been diagnosed in Spain in the last few years, reversing the trend of previous decades. Most cases have been found in marble masons because of the exponential growth in the use of quartz agglomerates as substitutes of marble. Quartz agglomerates are synthetic materials containing mainly quartz, but also other silica polymorphs (cristobalite and tridymite), which are considered more pernicious than quartz. The presence of different polymorphs of silica implies the need for x-ray diffraction (XRD) analysis for these to be distinguished, not only in bulk materials but also in respirable fractions from workplace atmospheres, as different threshold-limit values (TLVs) are established by Spanish legislation. For analysis of manufactured products, the Rietveld method allows the quantification of the mineral phases present in bulk materials from good-quality data obtained by XRD without the use of standards. Although it is known that high silica

Keywords

AgglomerateQuartzMaterials scienceComposite materialStishoviteMetallurgyForensic engineeringEngineering

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