Raw Dolomite (Flux, Glass & Refractory Grade)

Uncalcined dolomite by MgO, CaO, silica and size for blast furnaces, steel shops, glass and refractories

Dolomite is calcium magnesium carbonate, and raw dolomite is the stone as quarried, crushed and screened, before any calcining. Steel is the main buyer. A blast furnace or sinter plant charges it as a flux that brings magnesia into the slag, and wants CaO of 28 to 30% and MgO of 18 to 20% at least. A steel melting shop is stricter because every unit of silica costs lime: SMS grade holds silica at 3% or less, iron oxide plus alumina at 2% or less and total insolubles under 7%, and ferro-alloy furnaces ask for silica of 2% or less. Float and container glass makers buy on iron, because iron colours the glass, and on a tightly sized, washed grain. Refractory producers dead-burn a dense, low-impurity stone into doloma for furnace linings, and farmers spread ground dolomite as a liming material that also supplies magnesium. Lump is sold in size bands such as 10 to 40 mm and 40 to 80 mm for furnaces, with fines of 0 to 3 mm for sinter feed. Calcined products are a different heading and a different page.

India is the largest import market, at about 6.0 million MT in 2024: 2.6 million MT came overland from Bhutan, about 2.0 million MT by sea from quarry ports inside the Gulf and about 1.2 million MT from Oman, with Thailand and China supplying the rest. Landed values were about USD 18 to 25 per tonne. Japan imported about 2.0 million MT at USD 36 to 38 per tonne, mostly from China and Thailand, and the United States about 2.6 million MT, mostly from Canada. The Strait of Hormuz has been severely restricted since 28 February 2026, so the Gulf-coast tonnage that Indian steel plants relied on is not active supply, and stone exports from those ports fell by more than nine-tenths in March 2026. Oman, which exported about 1.25 million MT of dolomite in 2024 at about USD 10 per tonne FOB, and Thailand, at about 1.5 million MT and USD 12, load outside the strait. CBIL brokers raw dolomite from Omani and Thai quarries in Handysize and Supramax lots against SGS or Intertek certification of MgO, CaO, SiO₂, Fe₂O₃, Al₂O₃, loss on ignition, moisture and size distribution, with draft-survey quantity. Dolomite ships under the IMSBC Code as a Group C cargo that neither liquefies nor carries a chemical hazard, at a stowage factor of about 0.6 to 0.7 m³ per tonne, on FOB and CFR terms. Because CBIL also runs a chartering desk, LaycanDesk, the freight is quoted with the stone.

See also: Dolomitic lime and burnt dolomite, the calcined product (HS 2518.20) · Limestone flux from the same Omani quarries

Need the ship as well? Our chartering desk prices bulk limestone, gypsum and aggregates freight on LaycanDesk.

Excluded origins are not offered, including product re-exported, blended or re-processed through a third country. Every lot moves with a certificate of origin naming the producing plant, mine or grower country, and nothing is quoted before the seller and loading point are known.