Dolomite[2]
Overview
Dolomite is a naturally occurring mineral composed of calcium magnesium carbonate (CaMg(CO3)2). It forms in sedimentary environments and is commonly found in dolostone deposits. The mineral is valued for its alkaline properties, thermal stability, and versatility in industrial applications. Dolomite is widely used in water treatment to neutralize acidic water and remove heavy metals. Its ability to buffer pH and precipitate contaminants makes it a cost-effective solution for wastewater management. The mineral is also a key raw material in construction, agriculture, and glass production.
Physical and Chemical Properties
Dolomite appears as a white to gray powder or crystalline solid with a density of 2.84-2.86 g/cm³. It has a high melting point of approximately 1,250°C, where it decomposes rather than boiling. The mineral is slightly soluble in water but dissolves readily in acidic solutions. Its alkaline nature makes it effective for pH adjustment in water treatment and soil conditioning. Dolomite's thermal stability allows it to be used in high-temperature processes, such as steelmaking and glass production. The mineral is non-toxic but may cause mild irritation if inhaled as dust.
Main Applications
In water treatment, dolomite is used to neutralize acidic effluents and remove heavy metals like lead and cadmium. Its buffering capacity helps maintain stable pH levels in industrial wastewater systems. The mineral is also employed in drinking water treatment to reduce corrosion in pipelines. Dolomite is a key ingredient in construction materials, such as cement and asphalt, where it enhances durability. In agriculture, it serves as a soil conditioner to correct magnesium and calcium deficiencies. The glass industry uses dolomite as a flux to improve the thermal and chemical resistance of glass products.
Safety and Storage
While dolomite is generally non-toxic, prolonged exposure to dust may cause respiratory or skin irritation. Industrial users should implement dust control measures, such as ventilation or personal protective equipment (PPE). The mineral should be stored in a cool, dry place to prevent moisture absorption and caking. Dolomite is incompatible with strong acids, as it reacts vigorously to release carbon dioxide. Storage areas should be well-ventilated and free from acidic contaminants. Bulk shipments should be protected from rain and humidity to maintain product quality.
B2B Procurement Guide
When procuring dolomite, specify the required purity (typically 90-99%), particle size (e.g., 100-200 mesh for water treatment), and magnesium content (18-22% MgO). Verify supplier certifications, such as ISO 9001, to ensure consistent quality. Request material safety data sheets (MSDS) for compliance with local regulations. Bulk purchases (e.g., 20-ton loads) often qualify for discounted rates. Consider logistics, such as bagged vs. bulk delivery, based on your facility's handling capabilities. For water treatment applications, test dolomite's reactivity with your specific wastewater composition before large-scale adoption.
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