In general, magnesium oxide and magnesium hydroxide are used in a number of applications including:

AbrasivesAs a binder in grinding wheels
Animal feed supplementSource of magnesium ions for beef and dairy cattle and other animals
Boiler additivesRaises melting point of ash generated to produce a friable material that is easily removed; reduced corrosion of steel pipes holding steam as well as sulfur emissions into the environment
Boiler feedwater treatment Reduces iron, silica and solids
CeramicsIngredient in ceramics formulations
ChemicalsStarting point for the production of other magnesium salts such as sulfate and nitrate
CoatingsPigment extender in paint and varnish
ConstructionBasic ingredient in oxychloride, oxysulfate and phosphate cements used for flooring, wallboard, fiber board, and tile
ElectricalSemi-conductors; heating elements insulating filler between wire and outer sheath
FertilizersSource of essential magnesium for plant nutrition
FoodAdditive to prevent caking and improve flow in powders; adjust pH in food manufacturing
FoundriesCatalyst and water acceptor in shell molding
Glass manufactureIngredient for specialty, scientific and decorative glassware and fiberglass
Insulation Light, flexible mats for insulating pipes
Lubricating oils Additive to neutralize acids
Metal MiningAlkali to precipitate metals from acid streams
PharmaceuticalsSpecial grades of magnesium hydroxide, oxide and carbonate are used in antacids, cosmetics, toothpaste, and ointments
Plastics manufactureFlame retardant, filler, acid acceptor, thickener, catalyst and pigment extender
Pulp bleachingCellulose protector and alkali for peroxide bleaching of pulp
Refractory Refractory brick and repair materials used in steelmaking furnaces
Rubber compoundingFiller, acid acceptor, anti-scorch ingredient, curing aid, pigment
Steel industryAnnealing process; coating for grain-oriented silicon steel used in electrical transformers
Sugar refiningReduces scale build-up when used in juice clarification and precipitation
Uranium, gallium & boronPrecipitation initiator by acid neutralization processing
Wastewater treatmentAcid stream neutralizer; precipitates heavy metals
Water treatmentAdjust pH and precipitate heavy metals from drinking water

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