Publication detail

Possibilities of fly ash activation in alumina recovery process

MARKO, M. OPRAVIL, T. MÁSILKO, J. POŘÍZKA, J.

Original Title

Possibilities of fly ash activation in alumina recovery process

Type

conference paper

Language

English

Original Abstract

This paper summarises various possibilities of high-temperature fly ash (HTA) and fluidised-bed filter ash (FFA) activation in metal and oxides recovery processes (esp. alumina recovery). The study deals with chemical and phase composition ash modification to improve leachability of aluminium compounds into sulphuric acid solution. Samples of HTA and FFA produced by power plant industry in the Czech Republic were subjected to diverse types of modification, such as sulphuric acid concentration, ash/acid ratio and sintering reactions using several types of solid agents. Sintering reaction were based on forming acid soluble calcium aluminates via donating the system with calcium oxide, - carbonate and - chloride. Phase and chemical composition were characterised by means of XRD and XRF analysis and the concentration of Al in acid solutions via ICP-OES. Appropriate modification of input material by high-temperature sintering reaction using calcium chloride combined with extraction into 10 wt.% sulphuric acid leads to dissolution up to 99 % of aluminium from FFA and up to 94 % form HTA. At least, irreplaceable dopant for cement production – gypsum, is formed as a by-product of leaching.

Keywords

secondary raw material, material base, alumina recovery, fly ash utilization

Authors

MARKO, M.; OPRAVIL, T.; MÁSILKO, J.; POŘÍZKA, J.

Released

6. 6. 2019

Publisher

IOP Conference Series: Materials Science and Engineering

ISBN

1757-899X

Periodical

IOP Conference Series: Materials Science and Engineering

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

8

Pages count

8

URL

https://iopscience.iop.org/article/10.1088/1757-899X/583/1/012003

BibTex

@inproceedings{BUT158852,
  author="Michal {Marko} and Tomáš {Opravil} and Jiří {Másilko} and Jaromír {Pořízka}",
  title="Possibilities of fly ash activation in alumina recovery process",
  booktitle="International Conference Building Materials, Products and Technologies",
  year="2019",
  journal="IOP Conference Series: Materials Science and Engineering",
  pages="1--8",
  publisher="IOP Conference Series: Materials Science and Engineering",
  doi="10.1088/1757-899X/583/1/012003",
  issn="1757-899X",
  url="https://iopscience.iop.org/article/10.1088/1757-899X/583/1/012003"
}