With reference to the industrial manufacturing of Portland cement, consider the following statements: 1. The primary raw materials are calcareous (calcium carbonate-rich) and argillaceous (silica, alumina, and iron oxide-rich) materials. 2. Clinkerization occurs in the rotary kiln at temperatures reaching up to 1400°C to 1500°C, where partial fusion occurs. 3. Gypsum is mixed with the raw materials before they enter the rotary kiln to ensure uniform chemical blending. Which of the statements given above is/are correct?

Options:

• A: 2 and 3 only
• B: 1 and 2 only
• C: 1 and 3 only
• D: 1, 2 and 3

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