Influence of Temperature on Carbonation Effect of Refining Slag

Abstract

Abstract: With the orthogonal tests, the refining slags carbonation process to improve their stability and compactness effectively were researched. In the experiments in which the temperature was the dependent variable, the size distribution of carbonation was investigated. XRD, SEM, FT-IR, and TG-DTA were used to study the refining slags carbonation effect. The results show the factors in the carbonation of refining slags with descending significance: particle size, CO₂ ventilation, reaction temperature, rotating speed, and liquid-solid ratio. After carbonation, f-CaO, Ca₂SiO₄, Ca₃SiO₅, and 12CaO·7Al₂O₃ in the refining slags disappeare, which are replaced with calcite-dominated crystalline CaCO₃. After carbonation at different temperatures (20 ℃, 40 ℃, 60 ℃, and 80 ℃), the total percentage of weight loss in the thermal decomposition of refining residue are 35.26%, 35.24%, 34.36%, and 27.29%, respectively.

Key words: refining slag, carbonation effect, temperature, orthogonal test, characterization analysis

CLC Number:

TF524

FANG Minghang, YI Yuanrong, MA Wenqing, MA Zhongle, BAI Shuqi, LIN Yue, DU Yuncong. Influence of Temperature on Carbonation Effect of Refining Slag[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2020, 39(12): 3905-3912.

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