Calcined Dolomite Powder for Refractories
Finely ground calcined dolomite produced by heating dolomite rock to high temperatures, removing volatiles to create a stable refractory material. Classified under HTS 2518.20.00.00 as calcined dolomite, distinct from mere crushed stone, specifically used in steelmaking furnaces and cement production.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If not calcined or sintered, just crushed
Unprocessed or merely cut dolomite falls under the first subheading for natural dolomite.
If mixed with binders for ramming applications
Dolomite ramming mix with additives is specifically excluded from Chapter 25 and classified as refractory cements.
If further processed into finished cement clinker
Once incorporated into cement production, it becomes clinker under heading 2523, not raw calcined dolomite.
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Import Tips & Compliance
• Verify calcination process documentation to distinguish from unprocessed dolomite under 2518.10
• Include chemical analysis certificates showing high CaO/MgO content typical for refractory grade
• Ensure proper labeling as 'calcined' to prevent reclassification as dolomite ramming mix in 3816
Related Products under HTS 2518.20.00.00
Sintered Dolomite Blocks for Kiln Linings
Rectangular blocks of dolomite sintered at high temperatures to achieve dense, heat-resistant structure for industrial furnace linings. Falls under HTS 2518.20.00.00 due to sintering process on roughly trimmed dolomite slabs, used primarily in lime kilns and glass manufacturing.
Dead Burned Calcined Dolomite for Steel Flux
High-purity calcined dolomite dead-burned at 1700°C+ for use as fluxing agent in basic oxygen steelmaking converters. HTS 2518.20.00.00 covers this sintered/calcined form, differentiated from raw dolomite by its reactivity and thermal stability.
Calcined Dolomite Aggregate for Asphalt Mix
Coarse calcined dolomite aggregate used in hot mix asphalt for road construction due to polished stone value resistance. Classified in 2518.20.00.00 as the calcination imparts specific chemical stability beyond natural crushed stone.
Sintered Dolomite Slabs for Glass Furnace Crowns
Large rectangular slabs sintered from dolomite for crown construction in soda-lime glass melting furnaces. HTS 2518.20.00.00 applies to these roughly cut, thermally processed slabs before final refractory shaping.
High Reactivity Calcined Dolomite for Animal Feed
Fine calcined dolomite powder providing magnesium supplement for ruminant livestock feeds. Under 2518.20.00.00 as calcined mineral product, not yet a Chapter 31 fertilizer or Chapter 30 medicament.
Magnesia-Dolomite Sinter for Cement Rotary Kilns
Sintered blend of magnesia and calcined dolomite for transition zones in cement kiln linings. HTS 2518.20.00.00 captures the dolomite component's calcined/sintered state before final refractory assembly.