Overview
Crushed salt is a processed form of sodium chloride (NaCl) that has been mechanically ground into granules or powder. Unlike table salt, it typically lacks anti-caking agents and iodine fortification, making it more suitable for industrial applications. It is derived from either rock salt mining or evaporation of seawater or brine. The material is valued for its consistent particle size distribution, which facilitates controlled application in industrial processes. Its production involves crushing, screening, and sometimes washing to remove impurities. The resulting product is categorized by grain size, with common grades ranging from fine powder to coarse granules.
Physical and Chemical Properties
Crushed salt exhibits the characteristic cubic crystal structure of sodium chloride. Its high solubility in water (359 g/L at 20°C) makes it effective for solutions requiring rapid dissolution. The material is hygroscopic, meaning it absorbs moisture from the air, which can lead to caking if not stored properly. Thermally, crushed salt has a melting point of 801°C and boiling point of 1413°C. These properties make it stable under most industrial processing conditions. Its density of 2.16 g/cm³ is useful for calculating shipping weights and storage requirements. The white coloration and lack of organic impurities are quality indicators for many applications.
Main Applications
In food processing, crushed salt serves as a preservative and flavor enhancer for meat, dairy, and baked goods. Its uniform particle size ensures even distribution in mixtures. The water treatment industry uses it for water softening systems, where it regenerates ion exchange resins by removing calcium and magnesium ions. Industrial applications include use as a feedstock for chlorine and sodium hydroxide production through electrolysis. For winter maintenance, crushed salt's granular form provides better traction and more controlled melting than rock salt. Additional uses include hide processing in leather tanning and as a flux in metallurgy.
Safety and Storage
While crushed salt is non-toxic, dust generation during handling can cause respiratory irritation. Proper PPE including dust masks and eye protection is recommended for bulk operations. The material is generally recognized as safe (GRAS) for food contact when meeting purity standards. Storage requires protection from moisture to prevent caking. Bulk storage in silos should include aeration systems to maintain flowability. Plastic or treated steel containers are preferred to prevent corrosion. The material is stable under normal conditions but should be kept away from strong acids due to potential chlorine gas release.
B2B Procurement Guide
Industrial buyers should specify purity requirements (typically 95-99.5% NaCl), with food-grade applications demanding higher purity. Particle size distribution should match application needs - finer grades for rapid dissolution, coarser for controlled release. Packaging options range from 25kg bags to bulk tanker deliveries. Supplier qualifications should include ISO certification and, for food applications, HACCP compliance. Transportation costs significantly impact total price, so regional suppliers are often preferred. Minimum order quantities typically start at 1 metric ton, with discounts available for contract volumes. Always verify the absence of anti-caking agents if they would interfere with your process.
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