Calcined or Sintered Dolomite

Heat treatment transforms raw dolomite into calcined or sintered dolomite (2518200000), converting the carbonate mineral into reactive magnesium and calcium oxides used extensively as refractory linings in electric arc furnaces, basic oxygen furnaces, and cement kilns. The calcination or sintering process is the defining classification criterion that separates this product from uncalcined dolomite under 251810. Canada leads US imports, with Vietnam, Germany, Brazil, and Spain also among the top suppliers — a geographically diverse source base that reflects global steelmaking and refractory supply chains. Buyers should specify dead-burned versus caustic-calcined grades, as reactivity and density differ significantly between them.