How many of the following are used in the manufacture of ordinary Portland cement?
Limestone, clay, gypsum, silica, cryolite, borax

Question

How many of the following are used in the manufacture of ordinary Portland cement? Limestone, clay, gypsum, silica, cryolite, borax

TestHub · Accepted Answer

Limestone and clay are the principal raw materials.

Silica (sand) may be added to adjust the composition.

Gypsum is added during grinding to retard setting.

Cryolite is used in aluminium metallurgy, not ordinary Portland cement manufacture.

Borax is not used in the stated ordinary process.

The required materials are limestone, clay, gypsum and silica. Hence the count is $4$ .

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