Investigation of calcium-aluminate-based mold flux of different compositions

Irmtraud Marschall; Harald Harmuth

doi:10.1002/srin.202100187

Investigation of calcium-aluminate-based mold flux of different compositions

Irmtraud Marschall
, Harald Harmuth

Lehrstuhl für Gesteinshüttenkunde (320)

K1-MET GmbH, Leoben

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Begutachtung

Abstract

The liquidus temperature, crystallization behavior, and viscosity of calcium–aluminate (CA)-based mold flux systems are investigated by differential thermal analysis, quench tests, and viscosity measurements to understand the impact of SrO, B ₂O ₃, F, and Li ₂O on the flux properties. For mixtures with a CaO/Al ₂O ₃ (wt%) ratio of 1, the liquidus temperature of 1443 K and a viscosity of 0.37 Pa s are achieved with the addition of 6.5 wt% B ₂O ₃. Substitution of CaO for 8.3 wt% SrO in the B ₂O ₃-free compositions increases a liquidus temperature from 1547 to 1559 K, and 2.6 wt% increases the viscosity from 0.35 to 0.41 Pa s, indicating that low amount SrO is not beneficial in adjusting slag properties of CA mold flux. A fluorine content of up to 6.1 wt% decreases the melting temperature from 1547 to 1509 K and inhibits crystallization while promoting volatilization in the liquid state. Li ₂O (2.3 wt%) effectively enhances the glass-forming ability of the CA mold flux and decreases both the liquidus temperature from 1571 to 1509 K and the viscosity of the system from 0.43 to 0.28 Pa s. This study deepens the knowledge on CA flux systems, which could be useful for their effective design.

Originalsprache	Englisch
Aufsatznummer	2100187
Seitenumfang	8
Fachzeitschrift	Steel research international
Jahrgang	93.2022
Ausgabenummer	3
Frühes Online-Datum	9 Juni 2021
DOIs	https://doi.org/10.1002/srin.202100187
Publikationsstatus	Veröffentlicht - 10 Juni 2021

Bibliographische Notiz

Funding Information:
The authors gratefully acknowledge the funding support of K1‐MET GmbH, a metallurgical competence center. The research program of the K1‐MET competence center is supported by Competence Center for Excellent Technologies (COMET), the Austrian program for competence centers. COMET is funded by the Federal Ministry for Climate Action, Environment, Energy, Mobility, Innovation and Technology, the Federal Ministry for Digital and Economic Affairs, the Federal States of Upper Austria, Tyrol, and Styria as well as the Styrian Business Promotion Agency (SFG). Furthermore, thank goes to Upper Austrian Research GmbH for their continuous support. In addition to public funding from COMET, partial financing comes from the industrial partners RHI Magnesita, voestalpine Stahl, and voestalpine Stahl Donawitz and the scientific partner Montanuniversität Leoben.

Publisher Copyright:
© 2021 The Authors. Steel Research International published by Wiley-VCH GmbH

Zugriff auf Dokument

10.1002/srin.202100187

Andere Dateien und Links

Verknüpfung zur Publikation in Scopus

Dieses zitieren

@article{6879e8b946304684bd8dfb28347f7119,

title = "Investigation of calcium-aluminate-based mold flux of different compositions",

abstract = "The liquidus temperature, crystallization behavior, and viscosity of calcium–aluminate (CA)-based mold flux systems are investigated by differential thermal analysis, quench tests, and viscosity measurements to understand the impact of SrO, B 2O 3, F, and Li 2O on the flux properties. For mixtures with a CaO/Al 2O 3 (wt\%) ratio of 1, the liquidus temperature of 1443 K and a viscosity of 0.37 Pa s are achieved with the addition of 6.5 wt\% B 2O 3. Substitution of CaO for 8.3 wt\% SrO in the B 2O 3-free compositions increases a liquidus temperature from 1547 to 1559 K, and 2.6 wt\% increases the viscosity from 0.35 to 0.41 Pa s, indicating that low amount SrO is not beneficial in adjusting slag properties of CA mold flux. A fluorine content of up to 6.1 wt\% decreases the melting temperature from 1547 to 1509 K and inhibits crystallization while promoting volatilization in the liquid state. Li 2O (2.3 wt\%) effectively enhances the glass-forming ability of the CA mold flux and decreases both the liquidus temperature from 1571 to 1509 K and the viscosity of the system from 0.43 to 0.28 Pa s. This study deepens the knowledge on CA flux systems, which could be useful for their effective design. ",

author = "Irmtraud Marschall and Harald Harmuth",

note = "Publisher Copyright: {\textcopyright} 2021 The Authors. Steel Research International published by Wiley-VCH GmbH",

year = "2021",

month = jun,

day = "10",

doi = "10.1002/srin.202100187",

language = "English",

volume = "93.2022",

journal = "Steel research international",

issn = "1611-3683",

publisher = "Verlag Stahleisen GmbH",

number = "3",

}

TY - JOUR

T1 - Investigation of calcium-aluminate-based mold flux of different compositions

AU - Marschall, Irmtraud

AU - Harmuth, Harald

PY - 2021/6/10

Y1 - 2021/6/10

N2 - The liquidus temperature, crystallization behavior, and viscosity of calcium–aluminate (CA)-based mold flux systems are investigated by differential thermal analysis, quench tests, and viscosity measurements to understand the impact of SrO, B 2O 3, F, and Li 2O on the flux properties. For mixtures with a CaO/Al 2O 3 (wt%) ratio of 1, the liquidus temperature of 1443 K and a viscosity of 0.37 Pa s are achieved with the addition of 6.5 wt% B 2O 3. Substitution of CaO for 8.3 wt% SrO in the B 2O 3-free compositions increases a liquidus temperature from 1547 to 1559 K, and 2.6 wt% increases the viscosity from 0.35 to 0.41 Pa s, indicating that low amount SrO is not beneficial in adjusting slag properties of CA mold flux. A fluorine content of up to 6.1 wt% decreases the melting temperature from 1547 to 1509 K and inhibits crystallization while promoting volatilization in the liquid state. Li 2O (2.3 wt%) effectively enhances the glass-forming ability of the CA mold flux and decreases both the liquidus temperature from 1571 to 1509 K and the viscosity of the system from 0.43 to 0.28 Pa s. This study deepens the knowledge on CA flux systems, which could be useful for their effective design.

AB - The liquidus temperature, crystallization behavior, and viscosity of calcium–aluminate (CA)-based mold flux systems are investigated by differential thermal analysis, quench tests, and viscosity measurements to understand the impact of SrO, B 2O 3, F, and Li 2O on the flux properties. For mixtures with a CaO/Al 2O 3 (wt%) ratio of 1, the liquidus temperature of 1443 K and a viscosity of 0.37 Pa s are achieved with the addition of 6.5 wt% B 2O 3. Substitution of CaO for 8.3 wt% SrO in the B 2O 3-free compositions increases a liquidus temperature from 1547 to 1559 K, and 2.6 wt% increases the viscosity from 0.35 to 0.41 Pa s, indicating that low amount SrO is not beneficial in adjusting slag properties of CA mold flux. A fluorine content of up to 6.1 wt% decreases the melting temperature from 1547 to 1509 K and inhibits crystallization while promoting volatilization in the liquid state. Li 2O (2.3 wt%) effectively enhances the glass-forming ability of the CA mold flux and decreases both the liquidus temperature from 1571 to 1509 K and the viscosity of the system from 0.43 to 0.28 Pa s. This study deepens the knowledge on CA flux systems, which could be useful for their effective design.

UR - https://www.scopus.com/pages/publications/85107592600

U2 - 10.1002/srin.202100187

DO - 10.1002/srin.202100187

M3 - Article

SN - 1611-3683

VL - 93.2022

JO - Steel research international

JF - Steel research international

IS - 3

M1 - 2100187

ER -