Brucite
Overview
Brucite is a magnesium hydroxide mineral (Mg(OH)₂) found in metamorphic rocks and as an alteration product of peridotite. It is valued industrially for its high magnesium content (up to 69%) and flame-retardant properties. Naturally occurring brucite deposits are mined in Russia, the USA, Canada, and China, often alongside serpentine minerals. As a raw material, brucite is processed into powders or aggregates for industrial applications. Its natural form typically appears as foliated masses or fibrous crystals, with colors ranging from white to grayish-green depending on impurities. The mineral's layered structure contributes to its thermal stability and reactivity.
Physical and Chemical Properties
Brucite exhibits a trigonal crystal structure with perfect cleavage along {0001} planes. Its Mohs hardness ranges from 2.5 to 3, making it relatively soft compared to other industrial minerals. The material decomposes at 350°C, releasing water vapor and forming magnesium oxide (MgO), a property utilized in refractory applications. Chemically, brucite is a weak base that reacts with acids to form magnesium salts. Its solubility in water is low (0.0041 g/100 mL at 20°C) but increases significantly under acidic conditions. The mineral's flame retardancy stems from its endothermic decomposition, which absorbs heat and releases water vapor to suppress combustion.
Main Applications
The primary use of brucite is in flame retardant formulations, where it serves as an environmentally friendly alternative to halogenated compounds. It is incorporated into plastics, cables, and construction materials. In refractories, brucite improves thermal stability and corrosion resistance in basic linings for steelmaking furnaces. Other applications include wastewater treatment (as a pH adjuster and heavy metal precipitant), magnesium chemical production (e.g., magnesium sulfate and magnesium oxide), and as a filler in paper and specialty cements. High-purity brucite finds niche uses in pharmaceuticals and cosmetics as a mild alkaline agent.
Safety and Storage
Brucite is classified as non-hazardous under GHS criteria, though dust inhalation should be avoided as it may cause respiratory irritation. Personal protective equipment (PPE) including dust masks and goggles is recommended during handling. The material is non-combustible and chemically stable under normal conditions. For storage, brucite should be kept in moisture-resistant packaging in dry, well-ventilated areas away from strong acids. Bulk storage requires protection against caking due to humidity. Shelf life is essentially indefinite if properly stored, though processed powders may require anti-caking agents for long-term flowability.
B2B Procurement Guide
Industrial buyers should specify purity requirements (typically 85-95% Mg(OH)₂), particle size distribution (from 200 mesh to 10μm), and moisture content (<1% for most applications). Natural brucite often contains minor impurities like silica, iron oxides, or calcium compounds that may affect performance in specific uses. Key suppliers operate in Russia (Kuldur deposit), the USA (Nevada), and China (Liaoning province). Prices vary by quality and quantity, with contract pricing common for large-volume purchases. Testing should verify decomposition temperature (DSC/TGA), specific surface area (BET method), and whiteness index for color-sensitive applications.
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