Microstructural features of industrial Portland cement clinker samples are presented to illustrate the influence of the clinker melt chemistry on the reactions taking place on the surfaces of alite crystals during cooling at high temperatures. While clinker melts rich in Al₂O₃ are usually undersaturated with respect to CaO, leading to corrosion of alite crystals and formation of secondary belite, clinker melts rich in Fe₂O₃ are oversaturated with respect to CaO. This leads to a final growth step of alite during cooling, as long as the clinker temperature is still in the stability field of alite (>1250°C). In the first case, the microstructural features of the alite surface permits conclusions on the length of the precooling zone in the rotary kiln, which is closely connected to the flame shape. In the latter case, such conclusions cannot be drawn.

中文翻译：

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铝比对冷却过程中阿利特晶体表面反应的影响

介绍了工业波特兰水泥熟料样品的微观结构特征，以说明熟料熔体化学对高温冷却过程中阿利特晶体表面发生的反应的影响。虽然富含 Al ₂ O ₃的熟料熔体相对于 CaO 通常是不饱和的，导致阿利特晶体腐蚀并形成次生贝利特，但富含 Fe ₂ O _{3的熟料熔体}CaO 是过饱和的。只要熟料温度仍然在 alite 的稳定范围内（>1250°C），这将导致 alite 在冷却过程中的最后一个生长步骤。在第一种情况下，alite 表面的微观结构特征可以得出回转窑预冷区长度的结论，该长度与火焰形状密切相关。在后一种情况下，不能得出这样的结论。