The biggest disadvantage: the magnesium oxide desulfurization method is relatively complex and the miscellaneous cost is relatively high. Characteristics of magnesium oxide desulfurization: 1. high desulfurization efficiency. Magnesium oxide is much larger than calcium-based desulfurizer in chemical reaction activity, and its molecular weight is smaller than calcium carbonate and calcium oxide. 2. Reliable operation. Compared with calcium method, the biggest advantage of magnesium desulfurization is that the system will not have the problem of equipment scaling and blockage, which can ensure the safe and effective operation of the whole desulfurization system. At the same time, the PH value of magnesium desulfurization is controlled between 6.0 and 6.5.