화학공학소재연구정보센터
Journal of Hazardous Materials, Vol.364, 488-498, 2019
Formation mechanism of zinc-doped fayalite (Fe2-x,ZnxSiO4) slag during Check copper smelting
The interactions between Fe2SiO4 and ZnO play an essential role in the recovery of zinc from copper slag. The dissolution and substitution mechanism of ZnO in fayalite were investigated by using TG-DSC, XRD, PPMS DynaCool, XPS, Mossbauer and SEM-EDS analyses and compared with MS calculation results. The results indicate that the dissolution and substitution are actually processes of the penetrating dissolution of Zn(II) ions that can be divided into three steps: 1) ZnO dissociates into Zn1-yO and Zn(II) ions; 2) Zn(II) penetrates the gap of the octahedron outer layer to substitute Fe(II) sites in the internal structure of Si-O-Fe(II) (M2) to form (Fe2-x, Zn-x)SiO4; 3) Fe(II) is forced to migrate to the surface of (Fe2-x, Zn-x)SiO4 to form (Zn1-y, Fe(II)(y))O. These findings can be derived the occurrence state and distribution of zinc in copper slag theoretically.