Rotary Kiln

Products Display

• Cement Production

  Rotary kilns are the heart of cement manufacturing, responsible for converting raw meal into clinker—the key ingredient in cement. Here’s their role:​

  ● Raw meal preparation: Raw materials (limestone, clay, iron ore, and silica) are ground into a fine powder (raw meal) and fed into the kiln.​

  ● Calcination: In the upper kiln zones (800–1,200°C), limestone (CaCO₃) undergoes calcination, decomposing into calcium oxide (CaO) and carbon dioxide (CO₂):​CaCO₃ → CaO + CO₂↑.​

  ● Clinker formation: In the lower, hotter zones (1,450°C), calcium oxide reacts with silica, alumina, and iron oxide to form clinker minerals (e.g., alite, belite, aluminate, and ferrite). These minerals are crucial for cement’s binding properties.​

  ● Cooling and grinding: Clinker exits the kiln, is cooled, and then ground with gypsum to produce Portland cement.

• Limestone Processing

  Rotary kilns are widely used to process limestone for various industrial applications, primarily through calcination:​

  ● Quicklime production: Limestone (CaCO₃) is heated to 900–1,200°C in the kiln, undergoing calcination to form quicklime (CaO), a versatile material used in steelmaking, water treatment, and construction. The process removes CO₂, increasing reactivity.​

  ● Hydrated lime production: Quicklime can be further processed with water to form hydrated lime (Ca(OH)₂), but the initial calcination step in rotary kilns is critical for ensuring purity and reactivity.​

  ● Flue gas desulfurization (FGD): Calcined limestone (quicklime) is used to remove sulfur dioxide (SO₂) from industrial exhaust gases, making rotary kilns integral to environmental compliance in power plants and factories.