Magnesium-enhanced lime flue gas desulfurization (FDG) process with magnesium hydroxide recovery | Source: Lewis Benson

Magnesium Enhanced Quicklime (MEL) is a specialty commercial form of calcium oxide derived from a naturally occurring high-calcium limestone that contains an elevated magnesium content — above that of standard high-calcium limestone, yet below the threshold to be classified as dolomite. Its defining and commercially critical characteristic is that the calcium and magnesium in the source rock are not crystallographically bonded together, unlike in dolomitic limestone where Ca²⁺ and Mg²⁺ are locked in the CaMg(CO₃)₂ lattice. Upon calcination, this yields a product in which CaO and MgO remain as discrete, independently reactive species — a chemistry specifically engineered to enhance sulfur dioxide scrubbing efficiency in wet flue gas desulfurization (FGD) systems at coal-fired power plants. MEL is routinely tested for quality and consistency to ensure the right chemical and physical properties for FGD compliance applications.

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