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Magnesium oxide (MgO), or magnesia, is a white hygroscopic solid mineral that occurs naturally as periclase and is a source of magnesium. Magnesium Oxide is not Food Grade, but can be used as Stock Feed (Feed grade), Fertilizer, hydrometallurgy, sewage treatment, and steel manufacture.
It has an empirical formula of MgO and can be used extensively in the soil and groundwater remediation, wastewater treatment, drinking water treatment, air emissions treatment, and waste treatment industries for its acid buffering capacity and related effectiveness in stabilizing dissolved heavy metal species.
Granular MgO is often blended into metals-contaminated soil or waste material in order to drive the pH to the 8–10 range, where most metals are at their lowest solubilities.