Dicalcium silicate (C2S) has strong CO2 reactivity and is a possible low-carbon binder. In order to facilitate its industrial production, it is important to evaluate the potential influence of minor elements in the raw material on the performance of γ-C2S. In this work, the effect of Cr2O3, a common impurity in solid wastes, on the structure and carbonation properties of C2S was investigated. The results show that doping Cr2O3 can stabilize the β-C2S crystalline form at low temperatures, inhibit the transition from β-C2S to γ-C2S due to the substitution of Si by Cr to change the silica-oxygen tetrahedra, thereby reduce the degree of carbonation of clinkers. During calcination at 1350 °C, Cr2O3 was partially evaporated. The leaching rate of Cr from carbonized clinker decreased significantly and the solidification rate of Cr in carbonized clinker was greater than 89.9 %. This work lays a solid foundation for the low-temperature preparation of β-C2S from industrial solid wastes.