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| Investigation on fluidity of SFCA and sintering strength based on phase diagram |
| WANG Xiao-ai1， JIANG Xin2， GAO Yuan3， HUO Hong-yan3， SHEN Feng-man2 |
| （1. Technology Research Institute， HBIS Group Co.， Ltd.， Shijiazhuang 050023， Hebei， China； 2. School of Metallurgy， Northeastern University， Shenyang 110819， Liaoning， China； 3. Hansteel Company， HBIS Group
Co.， Ltd.， Handan 056003， Hebei， China） |
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Abstract The fluidity of the bonding phase SFCA （sillico-ferrite of calcium and aluminum） is important for the sintering strength. The fluidity of SFCA with different w（SiO2） was investigated based on the phase diagram analysis in the present work considering that the SFCA has not a certain chemical composition. The experimental results show that ，for different iron ore （different SiO2）， the chemical composition （or basicity） aimed for best fluidity is different； the fluidity of the SFCA is proportional to the amount of liquid， and is inversely proportional to the liquidus temperature. Then， the effects and mechanism of the fluidity and the w（SiO2） in iron ore on the sintering strength were investigated by sinter pot tests. The sintering experiments show that， in case of iron ore with w（SiO2）＝4.30%， the sintering strength is higher in the range of 1.8-2.2 of basicity， while in case of iron ore with w（SiO2）＝12.42%， the sintering strength obviously decreases when the basicity is higher or lower than 2.0 （peak value of basicity）. The fundamental mechanism is due to thermodynamics. The liquid zone is wider for low-SiO2 iron ores （w（SiO2）＝4.30%）. However， the liquid zone is narrower for high-SiO2 iron ores （w（SiO2）＝12.42%）. Therefore， the iron ore with higher w（SiO2） is not proposed being used in the sintering production. The research content and results are important for the application of iron ores and their matching.
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Received: 16 August 2018
Published: 09 May 2019
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2019, Vol. 54 
