Overview
Crushed dolomite is a naturally occurring calcium magnesium carbonate mineral processed into granular or powdered form. As a cost-effective raw material, it serves multiple industries due to its dual carbonate composition and neutralization capacity. Dolomite deposits are globally abundant, with major producers including China, the United States, and European countries. The crushing process determines particle size distribution, ranging from coarse aggregates (5–20 mm) to fine powders (<100 mesh), each suited for specific applications.
Physical and Chemical Properties
Dolomite's crystalline structure gives it greater hardness and weathering resistance compared to pure calcite. Its thermal decomposition begins at 800°C, releasing CO2 and forming calcium magnesium oxide—a valuable property for metallurgical fluxes. The mineral's mild alkalinity (pH 8–9 in slurry) makes it effective for acid neutralization. Unlike limestone, dolomite provides both calcium and magnesium nutrients, with typical compositions of 30% CaO and 20% MgO in high-grade material.
Main Applications
In construction, crushed dolomite aggregates enhance concrete durability and asphalt skid resistance. Agricultural grades (200–400 mesh) correct soil acidity while supplying essential magnesium. Industrial uses include glass manufacturing (as a stabilizer), iron/steel production (slag formation), and flue gas desulfurization. Recent developments explore dolomite in CO2 capture technologies due to its carbonation potential.
Safety and Storage
Although non-toxic, dolomite dust requires OSHA-compliant controls (PEL 15 mg/m³ total dust). Use NIOSH-approved respirators for prolonged exposure. Store in bulk bags or silos with moisture barriers to prevent caking. Transportation follows standard aggregate regulations. Note that finely ground dolomite may be classified as a combustible dust in certain concentrations—consult NFPA 654 for facility guidelines.
B2B Procurement Guide
Industrial buyers should specify: 1) MgO content (18–22% for premium grades), 2) acid insolubles (<3% for chemical processes), and 3) heavy metal limits for sensitive applications. Bulk shipments (1,000+ ton lots) typically offer 15–30% cost advantages. Quality certifications like ISO 9001 and MSDS availability indicate reliable suppliers. For construction projects, verify EN 13242 or ASTM C33 compliance for aggregate specifications.
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