Preparation of belite-sulfoaluminate cement with phosphate-rock acid-insoluble residue: Modification and influence of impurity ions on cement properties

•The impurity ions in the PAIR can promote the formation of mineral phase of B-CSA cement clinker.•The impurity ions in the PAIR can effectively activate the mineral phase of B-CSA cement clinker.•Impurity ions in the PAIR can effectively improve the strength development of B-CSA cement.