Informace o publikaci

Development and Properties of New Mullite Based Refractory Grog

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ZEMÁNEK David LANG Karel TVRDÍK Lukáš VŠIANSKÝ Dalibor NEVŘIVOVÁ Lenka ŠTURSA Petr KOVÁŘ Pavel KERŠNEROVÁ Lucie DVOŘÁK Karel

Rok publikování 2021
Druh Článek v odborném periodiku
Časopis / Zdroj Materials
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://www.mdpi.com/1996-1944/14/4/779
Doi http://dx.doi.org/10.3390/ma14040779
Klíčová slova mullite; refractory; high-alumina grog; kaolin; claystone
Popis The presented study is focused on optimization and characterization of a high-alumina refractory aggregate based on natural raw materials-kaolins, claystone, and mullite dust by-product (used to increase the alumina and mullite contents, respectively). In total, four individual formulas with the Al2O3 contents between 45 and 50 wt.% were designed; the samples were subsequently fired, both in a laboratory oven and an industrial tunnel furnace. The effects of repeated firing were examined during industrial pilot tests. Mineral and chemical compositions and microstructures, of both the raw materials and designed aggregates, were thoroughly investigated by the means of X-ray fluorescence spectroscopy, powder X-ray diffraction, and optical and scanning electron microscopies. Porosity, mineral composition, and mullite crystal-size development during the firing process were also studied. Based on the acquired results, the formula with the perspective to be used as a new mullite grog, featuring similar properties as the available commercial products, however, with reduced production expenses, was selected. The quality of grog determines to a large extent the properties of the final product. Hence, optimization of aggregates for specific refractories is of a great importance. The production of engineered aggregates provides the opportunity to utilize industrial by-products.
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