Effect of Fe/P mole ratio on the iron phosphate glass-ceramic wasteforms

The effects of iron phosphate glass-ceramic wasteforms with different Fe/P mole ratio on their structures and properties were investigated. The chemical durability of glass-ceramic wasteforms was measured by dissolution rate (DR) method. The structure of the glass-ceramic wasteforms was analyzed by Fourier turn infrared (FT-IR) and X-ray diffraction (XRD). The content of leaching solution was determined by ICP-OES. The results showed that the chemical stability of iron phosphate glass-ceramic wasteforms with n(Fe)/n(P)=0.67 was the best in all the prepared samples. The main crystalline phase of glass-ceramic wasteforms was monazite. There are a large number of [PO4]3- groups, a small number of [P2O7]4- groups, and without [PO3]- groups in the wasteforms. The leaching rate of the sample sintered at 980°C for 3 h was about 7.05×10-9g/(cm2&middotmin), which was lower than the leaching rate of other samples, Ce, La element was not detected in, the rest of the leaching elements from the glass phase.