This study systematically investigates the effects of SO and FeO variations in the raw mix on the mineral phase formation, transformation and regulation of iron-rich calcium sulfoaluminate (CSA) clinker. The findings reveal that excess SO can simultaneously facilitate the formation of CAS̅ phase and CS phase. Moreover, elevated levels of SO also enhance ions substitution within different mineral phases. In CAS̅ phase and ferrite phases, the substitution rate of Fe for Al gradually increases with rising SO content, which contributes to the formation of CAS̅-c phase and induces a continuous transformation of ferrite phases through the sequence CAF → CAF → CF → FeO. Essentially, excess SO modulates the species and crystalline structures of the mineral phases containing aluminum and iron through strategically directing the fate of FeO and AlO. Furthermore, the increase of FeO postpones the effect of excess SO on mineral phases formation and transformation.

中文翻译：

---

通过控制SO3和Fe2O3含量调控富铁硫铝酸钙熟料的矿物形成

本研究系统地研究了原料混合物中 SO 和 FeO 的变化对富铁硫铝酸钙 (CSA) 熟料的矿物相形成、转化和调节的影响。研究结果表明，过量的SO可以同时促进CAS̅相和CS相的形成。此外，SO 水平升高还会增强不同矿物相内的离子取代。在CAS̅相和铁素体相中，随着SO含量的增加，Fe对Al的替代率逐渐增加，这有助于CAS̅-c相的形成，并通过CAF→CAF→CF→FeO的顺序诱导铁素体相的连续转变。从本质上讲，过量的 SO 通过策略性地指导 Fe2O 和 Al2O 的命运来调节含有铝和铁的矿物相的种类和晶体结构。此外，FeO的增加推迟了过量SO对矿物相形成和转化的影响。