fig16
Figure 16. (A) XRD diagram after leaching and calcination; (B) Variation of Al content with roasting time under different leaching conditions (SN H2SO4-NH4Cl mixed solution, SF H2SO4-HF mixed solution); (C) Oxidative roasting of raw ore causing inclusions to burst and pits to form; (D) Cracking of quartz ore surface after roasting with KCl doping; (E) Diagram of precipitation of impurity ions during high-temperature chlorination roasting. XRD: X-ray diffraction.
