Which is/are the important raw material(s) required in cement industry?

Answer 1

Limestone and Clay are the raw materials used in cement factory

Answer 2

The most common raw material in common cement production are:

1. Limestone (supplies the bulk of the lime)
2. Clay, marl or shale (supplies the bulk of the silica, alumina and ferric oxide)
3. Other supplementary materials such as sand, fly ash/pulverised fuel ash (PFA), or ironstone to achieve the desired bulk composition