会议专题

Liquidus and phase equilibria in CaO-SiO2-FeOx-Al2O3 system under intermediate oxygen partial pressure

The thermodynamic information of CaO-Al2O3-FeOx and SiO2-Al2O3-FeOx systems are necessary for the design of metallurgical process and analysis of the vitrified bottom ash slag from municipal solid waste incineration ash. High temperature equilibrium experiments were carried out to investigate the effects of temperature on the equilibrium phase relations and liquidus lines for both CaO-Al2O3-FeOx and SiO2-Al2O3-FeOx systems at intermediate oxygen partial pressure of 10-4 atm. The experimental results by employing Electron Probe MicroAnalysis (EPMA) and Scanning Electron Microscope (SEM) analysis method showed an appreciable effect of temperature on the phase relations and liquidus. For CaO-Al2O3-FeOx system, both two-phase coexistence and three-phase coexistence regions are observed at either 1450°C or 1550°C, but the equilibrated phases in the two-phase region are different for the two temperatures. The liquid area of CaO-Al2O3-FeOx system enlarges and the liquidus on the Al2O3-FeOx side moves to the high Al2O3 region from 1450°C to 1550°C. For SiO2-Al2O3-FeOx system, only two-phase region is found at 1550°C, and the liquid area enlarges to the high iron oxide region as well as to the primary phase field of mullite with rising the temperature. The present experimental results on the liquidus showed a good agreement with the FactSage predictions.

CaO-Al2O3-FeOx system SiO2-Al2O3-FeOx system liquidus phase relations intermediate oxygen partial pressure

Nan WANG Shuichao CHEN Zongshu ZOU Zhan ZHANG Yanping XIAO Yongxiang YANG

School of Materials & Metallurgy, Northeastern University, 110819, China Dept. of Materials Science and Engineering, Delft University of Technology, 2628 CD, The Netherlands

国际会议

Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)

北京

英文

1-7

2012-05-27(万方平台首次上网日期,不代表论文的发表时间)