Fig. 7. X-ray diffraction pattern of flue gas desulfurization (FGD)-grout core recovered from the Roberts–Dawson mine 2 yr after injection. The formula of ettringite is Ca6Al2(SO4)3(OH)12·26(H2O) and the formula of hannebachite is 2CaSO3·(H2O).
Fig. 7. X-ray diffraction pattern of flue gas desulfurization (FGD)-grout core recovered from the Roberts–Dawson mine 2 yr after injection. The formula of ettringite is Ca6Al2(SO4)3(OH)12·26(H2O) and the formula of hannebachite is 2CaSO3·(H2O).