Overview
Dolomite for ceramics is a naturally occurring mineral composed of calcium magnesium carbonate. It serves as a cost-effective flux material in ceramic production, particularly for glazes and refractory applications. The material's dual carbonate composition provides unique thermal and chemical properties that enhance ceramic formulations. In industrial contexts, ceramic-grade dolomite is rigorously processed to meet strict purity standards, typically with MgO content exceeding 18% and minimal iron oxide impurities. Its controlled particle size distribution (usually 200-400 mesh) ensures optimal performance in slurry applications.
Physical and Chemical Properties
Ceramic-grade dolomite exhibits a rhombohedral crystal structure with a Mohs hardness of 3.5-4. Its thermal decomposition occurs in two stages between 700-900°C, releasing CO₂ and forming calcium magnesium oxide, a crucial transition for glaze maturation. The material's low thermal expansion coefficient (≈8×10⁻⁶/°C) contributes to glaze-body compatibility. Chemically, dolomite acts as a source of both CaO and MgO in ceramic systems. Its amphoteric nature allows it to function as a secondary flux in alkaline glazes while improving acid resistance in final products. The material's whiteness (typically >90% ISO brightness) makes it suitable for colored glaze formulations without chromatic interference.
Main Applications
In tile manufacturing, dolomite reduces firing shrinkage and improves mechanical strength in both wall and floor tiles. For sanitaryware, it enhances glaze opacity and scratch resistance at concentrations of 5-15% in raw batches. The material also serves as a key component in magnesium-based refractory bricks for kiln construction. Advanced applications include low-expansion porcelain bodies and fast-fire glazes where dolomite's controlled decomposition behavior prevents defects. Some manufacturers use it as a partial replacement for more expensive magnesium carbonate in high-end ceramic formulations, achieving 10-20% material cost savings without compromising quality.
Safety and Storage
While dolomite is generally non-hazardous, airborne dust particles may cause respiratory irritation during handling. Facilities should implement local exhaust ventilation and require NIOSH-approved N95 masks for workers. The material's moisture absorption tendency necessitates sealed packaging (typically 25kg or 1-ton bags) with desiccants. Storage areas should maintain relative humidity below 60% to prevent caking. Bulk storage requires concrete floors with moisture barriers and first-in-first-out inventory rotation. Spills should be cleaned with dry methods; water washing may create slippery surfaces due to the material's slight solubility.
B2B Procurement Guide
Industrial buyers should prioritize suppliers offering consistent chemical composition certificates with each batch, particularly monitoring MgO content variation (≤±0.5%). For glaze applications, request laser diffraction particle size analysis showing D50 between 15-30μm. Consider regional suppliers to minimize logistics costs given dolomite's bulk density (≈1.5t/m³). Negotiate contracts with quality clauses for impurity limits: Fe₂O₃ <0.3%, Al₂O₃ <0.5%, and LOI (loss on ignition) between 45-47%. For large-volume procurement (>1000t/year), explore FOB pricing from mining operations with dedicated ceramic product lines rather than general-purpose dolomite producers.
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