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| Volatilization mechanism of ESR slag with high #br# fluoride under hightemperature |
| ZHAO Junxue,LU Liang,ZHAO Zhongyu,WANG Ze,CUI Yaru,LI Xiaoming |
(School of Metallurgical Engineering，Xi′an University of Architecture and Technology，
Xi′an 710055， Shaanxi， China) |
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Abstract In order to explore the volatilization mechanism of the ESR slag component under hightemperatures，the hightemperature volatilization mechanism of slag is studied based on the CaF2CaOSiO2Al2O3MgO slag system for the Electroslag remelting (ESR) slag with a high fluoride. Using the calculation of FactSage software, thermogravimetric (TG) experiments and mass spectrometry (MS) analyses under a high temperature, combined with hightemperature roasting experiments, XRF analyses, SEM phase observations, the results have indicated: CaF2 reacts with SiO2 and MgO to form SiF4 and MgF2 gas between 550800 ℃; CaF2 reacts with MgO to form MgF2 gas and reacts with a small amount of Al2O3 to form AlF3 gas between 8001 200 ℃; the volatile is mainly CaF2 with a small amount of AlF3 in the range of 1 2001 500 ℃. The crystal is mainly calcium dialuminate and a small amount of cuspidine in the high temperature region (1 0001 400 ℃), and when the temperature is increased to 1 500 ℃, the crystal is mainly cuspidine. The purpose is to explore the volatilization mechanism of the ESR slag component under hightemperatures which has reference value of the optimization of the ESR slag preparation process.
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