Synthesis of cristobalite from silica sands of Tuban and Tanah Laut

Nurbaiti, Upik; Pratapa, Suminar

doi:10.1088/1742-6596/983/1/012014

Cited by 8 publications

(2 citation statements)

References 11 publications

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“…Then, the final cristobalite powders are obtained by calcination (at T > 950 °C) for several hours of the dried silica gel (the duration of the process can vary). The experimental micromorphology of the cristobalite filler of this study is indeed consistent with the micromorphology of synthetic samples obtained by gel calcination (Nurbaiti and Pratapa 2018).…”

Section: Radical Speciation In Relation To the Origin Of The Raw Crissupporting

confidence: 87%

“…Industrial cristobalite can be produced starting from silica sands, through a process including a silica gel formation step. According to MAK (2012) and Nurbaiti and Pratapa (2018), in fact, cristobalite can be produced by dissolution of silica precursor, followed by the formation of a silica gel by desiccation, consisting of amorphous silica powders. Then, the final cristobalite powders are obtained by calcination (at T > 950 °C) for several hours of the dried silica gel (the duration of the process can vary).…”

Section: Radical Speciation In Relation To the Origin Of The Raw Crismentioning

confidence: 99%

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A study of radicals in industrial raw cristobalite powders

et al. 2021

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We report the results of an experimental multianalytical characterisation of industrial cristobalite powders, used as raw materials for artificial stone production. Cristobalite is considered a serious threat to human health. The study was carried out through X-ray diffraction (XRD), scanning electron microscopy with energy dispersive microanalysis (SEM/EDS), continuous-wave (cw) and pulse electron paramagnetic resonance (EPR) spectroscopy. Our results point out a sub-micrometric size of the structural coherence in cristobalite, associated with numerous stacking defects. Moreover, the material was found characterised by the presence of superoxide radicals, whose persistence appears conceivably long. Radicals in a material synthesized through a high-temperature treatment were generated during the grinding step in the industrial production of cristobalite. During this process, in fact, both superoxide generation and structural defectivity are induced. Indeed, cristobalite powders already result activated by a radical population, before any kind of process in artificial stone production.

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Section: Radical Speciation In Relation To the Origin Of The Raw Crissupporting

confidence: 87%

Section: Radical Speciation In Relation To the Origin Of The Raw Crismentioning

confidence: 99%