This paper highlights the potential of microwave roasting in solid-waste treatment and carbon dioxide storage.

Based on the synergy of impurity removal and metal boride formation, HEA (CrFeCoNi) solvent was used to remove B from metallurgical-grade Si. With Si purification by the Si/CrFeCoNiSi 6 (HEAs) system, the compounds of HEAs and CrB 2 were found using energydispersive X-ray spectroscopy (XRD), while the mechanical properties of the HEA were enhanced by doping B. During the directional solidification process, the solid solubility (∼1600 ppmw) and segregation coefficient (∼0.07) of B in the Si/HEAs system were observed. As the cooling rate and the mass ratio of Si to HEA decreased, the diffusion velocity of B increased accordingly. The results showed that HEAs were effective as solvents for B removal.