Publication detail

Development and Properties of New Mullite Based Refractory Grog

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

15

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"
}