Potential application of aluminum phosphate binder in the treatment of waste containing strontium: effects of SrO content on structures and leaching stabilities of aluminum phosphate solidified systems

Solidification of radioactive waste containing strontium is a significant procedure in the nuclear waste treatment and disposal. In this research, structure evolution and leaching stability characteristics of aluminum phosphate binder matrix doped with different SrO contents are characterized. The results indicate that the change of SrO content leads to phase transformation of solidified samples. The significance of this research is that aluminum phosphate binder solidified system presents a high load capacity for SrO (SrO content of 50 wt%) as well as good leaching stability (normalized leaching rate 1.01 × 10 −4  g m −2 d −1 after 42 days) for solidified sample.