Dolomite Supplier & Exporter — Raw Lump and Calcined Grades
CaMg(CO₃)₂ Calcium Magnesium Carbonate · MgO 19 – 38%
Bulk dolomite in two forms off one deposit — raw carbonate lump for steel flux, glass and agriculture, and calcined dolomite for refractory and metallurgical use. Six certified samples run silica as low as 0.10% and iron as low as 0.01%, with a batch-specific Certificate of Analysis per shipment.
CaO 30 – 60%
Supply capability at a glance
0.10%
Silica, best certified sample
25 MT
MOQ — bagged (1 × 20ft)
7–14 days
Lead time, standard grades
Per batch
Certificate of Analysis
Physical Properties
Formula
CaMg(CO₃)₂
Mineral
Dolomite
CAS No.
16389-88-1
HS Code
2518.10
Bulk Density
1.6 – 1.9 g/cm³
Mohs Hardness
3.5 – 4
Synonyms: Dolomite Rock, Dolostone, Calcium Magnesium Carbonate, Calcined Dolomite, Dolomitic Lime · White to pale grey lump, chip or milled powder.
Six-digit WCO heading — national subheadings vary by destination.
Grades & Chemical Analysis
Two grades off the same deposit. The raw carbonate keeps its CO₂ and is bought on low silica and low iron; the calcined grade has been burnt off to oxide and is bought on combined CaO + MgO. Select a grade to view its full analysis.
Raw Grade — Steel flux, glass and agriculture
Raw Dolomite (Lump)
- CaO
- 30.22 – 32.38%
- MgO
- 19.02 – 21.68%
- SiO₂
- 0.099 – 1.54%
- Al₂O₃
- 0.02 – 0.34%
- Fe₂O₃
- 0.01 – 0.20%
- Na₂O
- 0.04 – 0.24%
- K₂O
- 0.01 – 0.043%
- SO₃
- 0.012 – 0.13%
- Loss on Ignition
- 45.92 – 47.50%
Ranges are the spread across the certified samples, not a blended average. The full sample-by-sample analysis is in the table below and in the downloadable sheet; a batch-specific CoA is issued per shipment.
Dolomite — Certified Sample Analysis
Every sample on the published analysis sheet, reported as certified. Sample d206 is the calcined grade, which is why its CaO and MgO sit so much higher and its loss on ignition is replaced by residual CO₂.
| Sample | CaO | MgO | SiO₂ | Al₂O₃ | Fe₂O₃ | L.O.I |
|---|---|---|---|---|---|---|
| d202 | 31.64% | 20.73% | 0.099% | 0.04% | 0.015% | 47.29% |
| d203 | 30.51% | 21.68% | 0.11% | 0.02% | 0.01% | 47.21% |
| d204 | 32.38% | 19.02% | 1.54% | 0.34% | 0.11% | 45.92% |
| d205 | 31.22% | 21.30% | 1.00% | — | 0.03% | 46.20% |
| d206 | 55 – 60% | 34 – 38% | 0.5% | 0.5% | 0.05% | CO₂ 2 – 5% |
| d207 | 30.22% | 21.59% | 0.20% | 0.16% | 0.20% | 47.50% |
A dash marks an element the certificate reports as below detection or does not report for that sample. Sample d204 additionally carries PbO 0.45%; d202 and d207 carry SO₃ at 0.012% and 0.13%.
Bespoke Production
Need a different sizing or calcination?
If none of the grades above matches your target chemistry, fineness, or packaging, tell us your requirements — we produce custom grades to your exact specification.
Applications
Dolomite is bought for two different reasons — the magnesia it carries into a melt, and the carbonate it gives up on heating. Which grade suits depends on which of those you are paying for.
Steelmaking Flux
Raw and calcined dolomite as slag conditioner, protecting the furnace lining.
Refractories
Calcined and dead-burned dolomite in basic refractory brick and gunning mixes.
Glass Manufacture
Magnesia source improving durability and working range of the melt.
Agriculture
Dolomitic lime raising soil pH while supplying magnesium.
Construction Aggregate
Crushed dolomite in concrete, asphalt and road base.
Filler & Extender
Milled dolomite in paint, plastics, rubber and adhesives.
Product Gallery
Material as it is stored, graded and loaded for export.
Packaging, Logistics & Trading Terms
How we size, bag, certify and ship dolomite. Terms can be adapted by agreement — tell us what your operation needs.
- Minimum Order Quantity
- 1 × 20 ft container (approx. 25 MT) bagged. 500 MT minimum for bulk vessel. Trial quantities available for qualification.
- Packaging
- 25 kg and 50 kg PP bags, 1–1.5 MT woven jumbo bags, or bulk. Lump supplied loose; milled grades bagged with a moisture-barrier liner on request.
- Incoterms & Loading Ports
- EXW, FOB, CFR and CIF (Incoterms® 2020). Standard loading at Bandar Abbas and Bandar Imam Khomeini; other ports by arrangement.
- Quality Certification
- Batch-specific CoA with every shipment covering CaO, MgO, SiO₂, Fe₂O₃ and loss on ignition. SGS / Bureau Veritas inspection at buyer’s cost.
- Lead Time
- 7–14 days for standard grades after order confirmation; 15–25 days for custom-milled or specially packed material.
- Storage & Handling
- Store raw dolomite under cover to keep fines dry. Calcined dolomite is hygroscopic and slakes on contact with moisture — keep it sealed and use it in rotation, or it will hydrate in the bag and lose the reactivity it was bought for.
Certificate of Analysis
A batch-specific CoA is issued with every shipment. Third-party inspection by SGS, Bureau Veritas or an inspector of your choice can be arranged at the buyer’s cost.
Ready to quote
Send us your grade, tonnage, destination port and packaging and we will return a firm FOB/CFR/CIF price with lead time.
Request a Dolomite Quote