Performance Study of CaO-CaF<sub>2</sub>- and CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-Based High-Efficiency Desulfurizers
In order to reduce the content of harmful impurity sulfur elements in steel to meet the quality requirements of high value-added steel, efficient desulfurization of RH vacuum degassing is essential. Based on the simplex lattice composition design method, the effects of typical compositions on liquid...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-05-01
|
| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/15/5/550 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850256872436662272 |
|---|---|
| author | Ruihong Cao Shengtao Qiu Ting Wu Haijun Wang |
| author_facet | Ruihong Cao Shengtao Qiu Ting Wu Haijun Wang |
| author_sort | Ruihong Cao |
| collection | DOAJ |
| description | In order to reduce the content of harmful impurity sulfur elements in steel to meet the quality requirements of high value-added steel, efficient desulfurization of RH vacuum degassing is essential. Based on the simplex lattice composition design method, the effects of typical compositions on liquidus temperature, sulfur capacity, melting temperature, the effects of typical compositions on liquidus temperature, sulfur capacity, melting temperature, viscosity, and desulfurization rate of CaO-CaF<sub>2</sub>- and CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-based desulfurizers were studied by thermodynamic calculation, the melting temperature test, and the slag–steel contact experiment. The results show that in CaO-CaF<sub>2</sub>- and CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-based desulfurizers, the changes in CaF<sub>2</sub>, MgO, and Al<sub>2</sub>O<sub>3</sub> contents has little effect on the equilibrium S content of molten steel at lower SiO<sub>2</sub> contents, whereas, at higher SiO<sub>2</sub> contents, the equilibrium S content of the molten steel is greatly increased when the CaF<sub>2</sub>, MgO, and Al<sub>2</sub>O<sub>3</sub> content is greater than a certain value. Meanwhile, the increase in CaF<sub>2</sub> and MgO content reduces the high-temperature viscosity and breaking temperature (corresponding to the turning point on the viscosity–temperature curve) to varying degrees, which results in a better slag fluidity and is favorable to the prevention of crusting. With the increase in Al<sub>2</sub>O<sub>3</sub> and SiO<sub>2</sub> content, the breaking temperature of the CaO-CaF<sub>2</sub>-based desulfurizer is significantly reduced, which is beneficial to preventing crust. However, when the breaking temperature of CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-based desulfurizer increases, part of the slag system has solidified at 1400 °C, which is easy to lead to slag crust when the temperature drops. Comprehensively, for the CaO-CaF<sub>2</sub>-based desulfurizer, CaO = 60 wt%, CaF<sub>2</sub> = 30 wt%, SiO<sub>2</sub> = 0–5 wt%, and add a small amount of Al<sub>2</sub>O<sub>3</sub> and MgO, its desulfurization effect is significant. For the CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-based desulfurizer, CaO = 39–57 wt%, Al<sub>2</sub>O<sub>3</sub> = 20–35 wt%, SiO<sub>2</sub> = 10–15 wt%, MgO = 4 wt%, CaF<sub>2</sub> = 4–8 wt%, its desulfurization effect meets the demand, and it can reduce equipment erosion and environmental pollution. |
| format | Article |
| id | doaj-art-8a683bb2c20540ffb74b85fef725b8a8 |
| institution | OA Journals |
| issn | 2075-4701 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj-art-8a683bb2c20540ffb74b85fef725b8a82025-08-20T01:56:32ZengMDPI AGMetals2075-47012025-05-0115555010.3390/met15050550Performance Study of CaO-CaF<sub>2</sub>- and CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-Based High-Efficiency DesulfurizersRuihong Cao0Shengtao Qiu1Ting Wu2Haijun Wang3School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan 243032, ChinaSchool of Metallurgical Engineering, Anhui University of Technology, Ma’anshan 243032, ChinaSchool of Metallurgical Engineering, Anhui University of Technology, Ma’anshan 243032, ChinaSchool of Metallurgical Engineering, Anhui University of Technology, Ma’anshan 243032, ChinaIn order to reduce the content of harmful impurity sulfur elements in steel to meet the quality requirements of high value-added steel, efficient desulfurization of RH vacuum degassing is essential. Based on the simplex lattice composition design method, the effects of typical compositions on liquidus temperature, sulfur capacity, melting temperature, the effects of typical compositions on liquidus temperature, sulfur capacity, melting temperature, viscosity, and desulfurization rate of CaO-CaF<sub>2</sub>- and CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-based desulfurizers were studied by thermodynamic calculation, the melting temperature test, and the slag–steel contact experiment. The results show that in CaO-CaF<sub>2</sub>- and CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-based desulfurizers, the changes in CaF<sub>2</sub>, MgO, and Al<sub>2</sub>O<sub>3</sub> contents has little effect on the equilibrium S content of molten steel at lower SiO<sub>2</sub> contents, whereas, at higher SiO<sub>2</sub> contents, the equilibrium S content of the molten steel is greatly increased when the CaF<sub>2</sub>, MgO, and Al<sub>2</sub>O<sub>3</sub> content is greater than a certain value. Meanwhile, the increase in CaF<sub>2</sub> and MgO content reduces the high-temperature viscosity and breaking temperature (corresponding to the turning point on the viscosity–temperature curve) to varying degrees, which results in a better slag fluidity and is favorable to the prevention of crusting. With the increase in Al<sub>2</sub>O<sub>3</sub> and SiO<sub>2</sub> content, the breaking temperature of the CaO-CaF<sub>2</sub>-based desulfurizer is significantly reduced, which is beneficial to preventing crust. However, when the breaking temperature of CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-based desulfurizer increases, part of the slag system has solidified at 1400 °C, which is easy to lead to slag crust when the temperature drops. Comprehensively, for the CaO-CaF<sub>2</sub>-based desulfurizer, CaO = 60 wt%, CaF<sub>2</sub> = 30 wt%, SiO<sub>2</sub> = 0–5 wt%, and add a small amount of Al<sub>2</sub>O<sub>3</sub> and MgO, its desulfurization effect is significant. For the CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-based desulfurizer, CaO = 39–57 wt%, Al<sub>2</sub>O<sub>3</sub> = 20–35 wt%, SiO<sub>2</sub> = 10–15 wt%, MgO = 4 wt%, CaF<sub>2</sub> = 4–8 wt%, its desulfurization effect meets the demand, and it can reduce equipment erosion and environmental pollution.https://www.mdpi.com/2075-4701/15/5/550RH desulfurizerthermodynamic calculationliquidus temperaturesulfur capacityviscosity |
| spellingShingle | Ruihong Cao Shengtao Qiu Ting Wu Haijun Wang Performance Study of CaO-CaF<sub>2</sub>- and CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-Based High-Efficiency Desulfurizers Metals RH desulfurizer thermodynamic calculation liquidus temperature sulfur capacity viscosity |
| title | Performance Study of CaO-CaF<sub>2</sub>- and CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-Based High-Efficiency Desulfurizers |
| title_full | Performance Study of CaO-CaF<sub>2</sub>- and CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-Based High-Efficiency Desulfurizers |
| title_fullStr | Performance Study of CaO-CaF<sub>2</sub>- and CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-Based High-Efficiency Desulfurizers |
| title_full_unstemmed | Performance Study of CaO-CaF<sub>2</sub>- and CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-Based High-Efficiency Desulfurizers |
| title_short | Performance Study of CaO-CaF<sub>2</sub>- and CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>-Based High-Efficiency Desulfurizers |
| title_sort | performance study of cao caf sub 2 sub and cao al sub 2 sub o sub 3 sub sio sub 2 sub based high efficiency desulfurizers |
| topic | RH desulfurizer thermodynamic calculation liquidus temperature sulfur capacity viscosity |
| url | https://www.mdpi.com/2075-4701/15/5/550 |
| work_keys_str_mv | AT ruihongcao performancestudyofcaocafsub2subandcaoalsub2subosub3subsiosub2subbasedhighefficiencydesulfurizers AT shengtaoqiu performancestudyofcaocafsub2subandcaoalsub2subosub3subsiosub2subbasedhighefficiencydesulfurizers AT tingwu performancestudyofcaocafsub2subandcaoalsub2subosub3subsiosub2subbasedhighefficiencydesulfurizers AT haijunwang performancestudyofcaocafsub2subandcaoalsub2subosub3subsiosub2subbasedhighefficiencydesulfurizers |