ISSN 2594-357X
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Firstly, the commercial thermodynamic software package FactSage was applied in the calculation of phase diagram from the view point of melting point for the definition of slag composition range at different Al2O3 content levels; secondly, the KTH melt viscosity model was used in viscosity at 1,450°C calculation for slag compositions proposed by FactSage; thirdly, slag specimen were prepared with Al2O3 content of 18 wt.%, 20 wt.%, 25 wt.%, 30 wt.%, 35 wt.% for viscosity experiments based on analysis of the above theoretical calculation results; and finally optimization schemes were proposed of blast furnace slag composition at different Al2O3 content levels. This kind of research method with the combination of theory and experiment accelerated remarkably working process, reduced test cost and improved reliability and accuracy of the results. Taking the highest Al2O3 content 20 wt.% that is possibly attained in China at the present as an example, it is revealed by this work that CaO/SiO2 ratio should be regulated between 1.20 and 1.30 and MgO content should be controlled at about 8 wt.%. Control of lower MgO content is favorable for the decrease of slag volume and coke rate. This concept has already been applied into the practical production of blast furnaces in Wuhan Iron and Steel Corporation (Group).
Firstly, the commercial thermodynamic software package FactSage was applied in the calculation of phase diagram from the view point of melting point for the definition of slag composition range at different Al2O3 content levels; secondly, the KTH melt viscosity model was used in viscosity at 1,450°C calculation for slag compositions proposed by FactSage; thirdly, slag specimen were prepared with Al2O3 content of 18 wt.%, 20 wt.%, 25 wt.%, 30 wt.%, 35 wt.% for viscosity experiments based on analysis of the above theoretical calculation results; and finally optimization schemes were proposed of blast furnace slag composition at different Al2O3 content levels. This kind of research method with the combination of theory and experiment accelerated remarkably working process, reduced test cost and improved reliability and accuracy of the results. Taking the highest Al2O3 content 20 wt.% that is possibly attained in China at the present as an example, it is revealed by this work that CaO/SiO2 ratio should be regulated between 1.20 and 1.30 and MgO content should be controlled at about 8 wt.%. Control of lower MgO content is favorable for the decrease of slag volume and coke rate. This concept has already been applied into the practical production of blast furnaces in Wuhan Iron and Steel Corporation (Group).
Palavras-chave
Phase diagram calculation; Viscosity calculation; High alumina blast furnace slag; Properties optimization.
Phase diagram calculation; Viscosity calculation; High alumina blast furnace slag; Properties optimization.
Como citar
Bi, Xue-gong;
Rao, Changrun;
Yang., Fu.
PHASE DIAGRAM CALCULATION OF HIGH ALUMINA
BLAST FURNACE SLAG SYSTEMS AND EXPERIMENTAL
STUDY OF THEIR FLUIDITY
,
p. 689-697.
In: 42º Seminário de Redução de Minério de Ferro e Matérias-primas / 13º Seminário Brasileiro de Minério de Ferro / 6th International Congress on the Science and Technology of Ironmaking,
Rio de Jabeiro,
2012.
ISSN: 2594-357X
, DOI 10.5151/2594-357X-22144
