Preparation of metakaolin with high whiteness

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26310%2F20%3APU139398" target="_blank" >RIV/00216305:26310/20:PU139398 - isvavai.cz</a>
Result on the web
<a href="https://www.fch.vut.cz/vav/konference/sok/vystupy/sbornik-abstrakty-konference-2020-pdf-p198641?fbclid=IwAR3v2HmV5tOg975FBenm5j2cH6IBJqXzKK5oyXpeLZHImePoTYc7o3ecAws" target="_blank" >https://www.fch.vut.cz/vav/konference/sok/vystupy/sbornik-abstrakty-konference-2020-pdf-p198641?fbclid=IwAR3v2HmV5tOg975FBenm5j2cH6IBJqXzKK5oyXpeLZHImePoTYc7o3ecAws</a>
DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Preparation of metakaolin with high whiteness
Original language description
The term kaolin is used to describe white clays whose main mineral is kaolinite Al2Si2O5(OH)4. Kaolinite is formed by the decomposition of various of feldspars and therefore is usually doped with other minerals (quartz, sulphur, feldspars, micas and iron and titanium oxides). The quality of the clays and over all kaolin is measured in function of iron content, because this element gives the red-brown colour to this type of minerals. This paper summarizes the various possibilities of kaolin bleaching by firing. Kaolin of 20 grams dosage was fired at 1 100 °C for 2 hours. Several types of reducing agents (spar, specially ground quartz (SGQ), alumina and a mixture of graphite and sodium chloride) were used during firing with a goal to reduce the present iron 3+ to less colouring state of Fe2+ thus increase the whiteness of kaolin. It was found that the best effect on increasing the whiteness of kaolin has the firing of the raw material itself. Reducing agents were added in weight rations of 1, 3 and 5 %
Czech name
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Czech description
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Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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