Metall. Res. Technol.
Volume 119, Number 4, 2022
|Number of page(s)||8|
|Published online||06 July 2022|
Recycling of chrysotile-asbestos production waste
M. Auezov South Kazakhstan University, Shymkent, 160000 Tauke Khan 5, Kazakhstan
* e-mail: firstname.lastname@example.org
Accepted: 19 May 2022
The article examines results of studies on the effect of temperature, amount of carbon and pressure on the possibility of obtaining iron silicides and gaseous magnesium by carbon-thermal reduction of silicon and magnesium oxides containing in chrysotile-asbestos waste products. The studies were carried out using the HSC-6.0 software package (Outokumpy) and the second-order rotatable designs (Box-Hunter plans). It has been established that technology allows us to increase αSi(al), for example, at 1400 °C from 89.6 to 96.75%, reduce undesirable losses of silicon with gaseous SiO from 8.97 to 2.08% and slightly increase αMg(gas) from 97.41 to 97.54%. The alloy formed at 1300 °C contains 28.7% of silicon and corresponds to FS25 grade ferrosilicon.
Key words: chrysotile-asbestos waste / thermodynamic modeling / electric smelting / magnesium / ferroalloy
© EDP Sciences, 2022
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