Overview
Halite, known as 石盐 (shí yán) in Chinese, is the mineral form of sodium chloride occurring in extensive sedimentary beds. Formed through the evaporation of ancient seawater, it's mined globally with major deposits in the US, China, and Germany. While primarily an industrial commodity, some traditional medicine systems utilize purified forms for electrolyte balance. In commercial contexts, halite is classified by grain size and purity. Food-grade halite undergoes strict processing to remove impurities, while industrial-grade salt may contain trace minerals. The crystalline structure makes it easily identifiable, with perfect cubic cleavage being a diagnostic feature.
Physical and Chemical Properties
Halite displays isotropic optical properties with a refractive index of 1.544. Its Mohs hardness of 2.5 makes it softer than calcite but harder than gypsum. The mineral's distinctive salty taste and solubility differentiate it from similar-looking minerals like sylvite (KCl). Thermodynamically stable up to 800°C, halite begins losing chlorine gas at higher temperatures. Its hygroscopic nature requires careful packaging, especially in humid climates. When dissolved, it forms a neutral solution (pH ~7) with high electrical conductivity due to complete ionic dissociation.
Main Applications
Over 60% of global halite production serves chemical manufacturing, particularly chlorine-alkali processes for PVC and bleach production. In winter maintenance, medium-grade halite (with anti-caking agents) melts ice down to -9°C. The food industry utilizes ultra-pure (<0.3% impurities) halite for seasoning and preservation. Emerging applications include salt therapy rooms (halotherapy) and electrolyte solutions for medical use. Some agricultural operations use halite as a sodium supplement for livestock, while water treatment plants employ it for regeneration of ion-exchange resins.
Safety and Storage
Bulk halite storage requires concrete or asphalt pads to prevent ground contamination. Industrial users should implement dust control measures as airborne particles may corrode nearby equipment. Food-grade storage mandates FDA-approved containers with moisture barriers. While non-toxic, excessive inhalation of halite dust may cause respiratory irritation. First aid measures include flushing eyes/skin with water if irritation occurs. Spilled material should be swept dry rather than washed away to prevent surface water salinity increases.
B2B Procurement Guide
Industrial buyers should specify: 1) NaCl percentage (industrial grade typically 95-99%), 2) granulometry (coarse 3-5mm for de-icing vs fine <1mm for chemical use), and 3) anti-caking agents (e.g., sodium ferrocyanide). Sea salt variants command 20-30% premiums over mined halite. Quality verification should include ICP-MS testing for heavy metals (As <1ppm, Pb <2ppm for food grade). For international shipments, request moisture-proof woven polypropylene bags with UV protection. Spot prices fluctuate seasonally, with winter demand spikes in cold climates.
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