Calcium silicate is the undesirable bonding phase in sinter with relatively high melting point and poor reducibility, while the formation mechanism in sinter is ambiguous. Herein, the phase transformation, phase quantification, and morphology evolution of calcium silicate and calcium ferrite in CaO‐SiO 2 ‐Fe 2 O 3 ‐Al 2 O 3 systems under different n(Fe 2 O 3 )/n(CaO) and Al 2 O 3 content are investigated. It is found that with the increase of n(Fe 2 O 3 )/n(CaO), the calcium ferrite phases transform from Ca 2 Fe 2 O 5 (C 2 F) to complex calcium ferrite, and calcium silicate phases including β‐Ca 2 SiO 4 (β‐C 2 S) and γ‐Ca 2 SiO 4 (γ‐C 2 S) are promoted. Moreover, small amount (2%) of Al 2 O 3 can effectively promote the content of silico‐ferrite of calcium and aluminum (SFCA) increasing from 20.95% to 46.69%, whereas inhibiting the β‐C 2 S from 51.79% to 42.34%. When the content of Al 2 O 3 is over 4%, the Ca 2 Al(AlSiO 7 ) phase is formed, where both the SFCA and calcium silicate are inhibited. On this base, the competitive mechanism for the formation of calcium silicate and calcium ferrite is revealed, where the Ca 2+ and Si 4+ are preferred to react with Fe 3+ and Al 3+ to form liquid phase SFCA, while the amount for β‐C 2 S or γ‐C 2 S can be decreased due to the deprivation of Ca 2+ and Si 4+ .
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Du et al. (2024) studied this question.
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