不同硫酸盐环境下铝酸三钙的劣化过程及机制

doi:10.19964/j.issn.1006-4990.2021-0648

Abstract

Abstract:

The effect of sodium sulfate and magnesium sulfate solution on the damage of tricalcium aluminate single ore slurry was studied.The deterioration of macro properties of the slurry was studied by appearance，expansion rate and mass change.The content of corrosion products and microstructure of the slurry were further analyzed by semi quantitative X-ray diffraction（XRD） and scanning electron microscopy（SEM）.Finally，the formation characteristics of ettringite in C₃A-CaSO₄ system were studied in situ by optical microscope.The results showed that the infiltration of external sulfate ions would react with the original hexagonal plate calcium sulphoaluminate hydrate to form ettringite.The continuous formation of needle rod ettringite in a limited space would lead to specimen expansion and increase in mass.In the sodium sulfate solution，the ettringite content in the slurry increased to 20.12% after 120 h soaking，while the ettringite content in the magnesium sulfate solution was only 6.87%.Due to the existence of magnesium ions in magnesium sulfate solution，magnesium hydroxide precipitates would be formed and attached to the surface of single mineral cement stone，which inhibited the invasion of external sulfate ions.At the same time，the lower pH caused by the consumption of hydroxyl ions in this environment was conducive to the growth of gypsum.

Key words: sulfate attack, tricalcium aluminate, sodium sulfate, magnesium sulfate

CLC Number:

TQ125.14

WANG Bingjian,QI Daozheng,CHEN Deng. Degradation processes and mechanism of tricalcium aluminate in different sulfate environment[J]. Inorganic Chemicals Industry, 2022, 54(8): 119-124.

Figures/Tables 10

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侵蚀溶液	早期（14 h）	中期（30 h）	后期（>200 h）
硫酸钠溶液	表面起皮	表层酥化	表层软化、剥落
硫酸镁溶液	表面微裂纹	表层明显开裂	表层开裂、剥落

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Degradation processes and mechanism of tricalcium aluminate in different sulfate environment

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