Magnesium Oxide Desulfurization Technology

Magnesium oxide desulfurization technology is a promising desulfurization process, which is relatively mature. Magnesium oxide desulfurization process was widely used all over the world. Among them, more than 100 projects have been applied in Japan. 95% of Taiwan’s power plants use magnesium oxide desulfurization technology, and it also applied in the USA, Germany, China etc.

Working Principle

The FGD process system is mainly composed of a magnesium hydroxide slurry preparation system, flue gas system, flue gas pretreatment system, SO2 absorption system, absorption tower evacuation system, desulfurization by-product slurry transport system and dehydration system, and water supply system. The principle of desulfurization of magnesium oxide is that the basic oxide reacts with water to form a hydroxide, and then reacts with a sulfurous acid solution formed by dissolving sulfur dioxide in water to carry out an acid-base neutralization reaction, and the magnesium oxide reacts to form magnesium sulfite.

Technology Advantages

Magnesium oxide (MgO) exists in the natural state as a free magnesite ore. Magnesite and dolomite are the main raw materials for producing magnesium oxide. In order to ensure good slaking performance and high desulfurization absorption capacity, magnesium oxide as a desulfurization absorbent should have the following main qualities:

Technical Parameter of Magnesium Oxide Powder

Color White or light grayish white
Content of MgO ≥90%
Content of CaO ≤1.50%
Particle Size 250-325 Mesh(45-60 Micron)
Loss on ignition (LOI) <5.50%
HCl Insoluble <0.20%
Chloride content(CI) <0.15%
Sulfate Content(SO4) <0.40%
Iron Content(Fe) <0.10%
Manganese Content(Mn) <0.007%
Silicon Dioxide Content(SiO2) <0.40%
Stacking Density 600-800kg/m3

Magnesium Oxide Powder Production Line



Project Case

Project Case

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