Influence of Hydrothermal Temperature on Phosphorus Recovery Efficiency of Porous Calcium Silicate Hydrate

Abstract EN

Porous calcium silicate hydrate (PCSH) was synthesized by carbide residue and white carbon black.

The influence of hydrothermal temperature on phosphorus recovery efficiency was investigated by Field Emission Scanning Electron Microscopy (FESEM), Brunauer-Emmett-Teller (BET), and X-Ray Diffraction (XRD).

Hydrothermal temperature exerted significant influence on phosphorus recovery performance of PCSH.

Hydrothermal temperature 170°C for PCSH was more proper to recover phosphorus.

PCSH could recover phosphorus with content of 18.51%.

The law of Ca2+ and OH− release was the key of phosphorus recovery efficiency, and this law depended upon the microstructure of PCSH.

When the temperature of synthesis reached to 170°C, the reactions between CaO and amorphous SiO2 were more efficient.

Solubility of SiO2 was a limiting factor.