Question

is a fine grey powdered
mixture of limestone and clay.​

Answer 1

Answer:

It is a fine powder, produced by heating limestone and clay minerals in a kiln to form clinker, grinding the clinker, and adding 2 to 3 percent of gypsum. Several types of Portland cement are available. The most common, called ordinary Portland cement (OPC), is grey, but white Portland cement is also available.

Answer 2

Portland cement is a fine grey powdered  mixture of limestone and clay.​

Explanation:

• The process of producing cement is a complex process.
• In this process that begins with mining and then grinding raw materials.
• Limestone and clay are the raw material, then it grind to make fine powder, it is called raw meal.
• Then this minerals heated at the sintering temperature 1450 degree celcius in a cement klin to form clinker.
• In a cement mill, the clinker are grind to make fine powder and it is mixed with 2 to 3 percent of gypsum to make cement.

To Learn More...

1.Mixture of calcium aluminate and calcium silicate is called

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