Diatomite releases silica during spirit filtration

Abstract

The purpose of this study was to ascertain whether diatomite is an inert filter aid during spirit filtration. Surely, any compound with a negative effect on the spirit composition or the consumer's health could be dissolved. In this study different diatomites were treated with 36% vol. ethanol/water mixtures and the amounts and structures of the extracted compounds were determined. Furthermore, Brandy de Jerez was diatomite- and membrane-filtered at different temperatures and the silicon content was analysed. It was found that up to 0.36% by weight of diatomite dissolved in the aqueous ethanol and amorphous silica, in the form of hollow spherical microparticles, was the most abundant component. Silicon concentrations in Brandy de Jerez increased by up to 163.0% after contact with diatomite and these changes were more marked for calcined diatomite. In contrast, reductions of more than 30% in silicon concentrations were achieved after membrane filtration at low temperatures.

Salud y riesgos laborales por el manejo de sílice en el proceso de sandblasting./ Health risks and labor management in the process of silica sandblasting

“…Los usos y aplicaciones industriales de sílice cristalina, se derivan principalmente por sus propiedades químicas y físicas, entre lo que destaca su dureza, resistencia química, piezoelectricidad, alto punto de fusión, transparencia y piroelectricidad (25).…”

“…), piletas de natación, etc. (25). Además, se emplea como un medio granular filtrante, especialmente en el tratamiento del agua potable y residual (lecho profundo) (27).…”

“…En el caso del sandblasting (palabra inglesa que designa la proyección de arena a alta presión mediante pistolas de aire comprimido es otro de los usos de la arena de sílice se ha convertido en el método principal para el acabado de la mayoría de los vaqueros modernos que requieren ese look "desgastado". Para suavizar, dar forma y limpiar el vaquero, en el proceso de sandblasting se hacen pasar a través de la tela partículas abrasivas a gran velocidad (25).…”

“…En este sitio, las partículas de polvo son removidas por las células fagocíticas llamadas macrófagos. Éstos pueden ser removidos por el sistema mucociliar o por el sistema linfático (25,36).…”

Study on Purification Diatomite with nitric acid by Thermal Closed System

“…Due to well-developed porous structure with large specific surface area, diatomite possesses lots of excellent physical and chemical characteristics, such as low bulk density, chemical stability, high mechanical strength, and relatively low price owing to its abundance, etc. As a result of these features, it has been widely employed in variety of other applications: filter aid [2] , adsorbents [3] , and as support for catalysts [4] . China has massive diatomite resources, but the vast majority of which are of low or moderate quality, and raw diatomite commonly contain several types of impurities, which block the porous and limit the performance.…”