I. Process Introduction

Magnesium-based desulfurization uses magnesium oxide (MgO) as raw material, which is processed into slurry as a desulfurizing agent after maturation. It comes into contact with flue gas through counterflow in the absorption tower, where the magnesium oxide in the slurry undergoes a chemical reaction to be removed, resulting in magnesium sulfate. This solution can be used to produce struvite or to produce magnesium sulfate crystals through evaporation, concentration, and crystallization, and can serve as a foliar fertilizer.

II. The main chemical reactions occurring during desulfurization

MgO+H20=Mg(OH)2

Mg(OH)2+S02=MgS03+H20

Mgs03+H20+S02=Mg(HSO3)2

MgsO3+1/202=MgS04

Section 3: Magnesium Oxide Desulfurization Features:

Magnesium oxide desulfurization is a promising desulfurization process that is relatively mature and has abundant raw material sources. China has a substantial reserve of magnesium oxide. Therefore, magnesium oxide is fully capable of being used as a desulfurizing agent in the desulfurization systems of various units.

1. Low investment in magnesium process, low operating costs, high desulfurization efficiency, simple structure, and reduces secondary pollution.

2. Magnesium-based desulfurization offers a significant advantage over calcium-based methods by avoiding system blockages due to equipment scaling. It ensures the entire desulfurization system operates safely and effectively, while also maintaining a pH level between 6.0 and 6.5, which to a certain extent resolves the issue of equipment corrosion.