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ZEMÁNEK, D. LANG, K. TVRDÍK, L. VŠIANSKÝ, D. NEVŘIVOVÁ, L. ŠTURSA, P. KOVÁŘ, P. KERŠNEROVÁ, L. DVOŘÁK, K.
Original Title
Development and Properties of New Mullite Based Refractory Grog
Type
journal article in Web of Science
Language
English
Original Abstract
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.
Keywords
mullite; refractory; high-alumina grog; kaolin; claystone
Authors
ZEMÁNEK, D.; LANG, K.; TVRDÍK, L.; VŠIANSKÝ, D.; NEVŘIVOVÁ, L.; ŠTURSA, P.; KOVÁŘ, P.; KERŠNEROVÁ, L.; DVOŘÁK, K.
Released
7. 2. 2021
Publisher
MDPI
Location
Switzerland
ISBN
1996-1944
Periodical
Materials
Year of study
14
Number
4
State
Swiss Confederation
Pages from
1
Pages to
15
Pages count
URL
https://www.mdpi.com/1996-1944/14/4/779
Full text in the Digital Library
http://hdl.handle.net/11012/196748
BibTex
@article{BUT169215, author="David {Zemánek} and Karel {Lang} and Lukáš {Tvrdík} and Dalibor {Všianský} and Lenka {Nevřivová} and Petr {Štursa} and Pavel {Kovář} and Lucie {Keršnerová} and Karel {Dvořák}", title="Development and Properties of New Mullite Based Refractory Grog", journal="Materials", year="2021", volume="14", number="4", pages="1--15", doi="10.3390/ma14040779", issn="1996-1944", url="https://www.mdpi.com/1996-1944/14/4/779" }