Question

Which of the following is not a raw material used in the cement industry ?
(A) Limestone
(B) Silica
(C) Manganese
(D) Gypsum

Answer 1

Hint: It is a mineral present in various plants, such as almonds, legumes, beans, tea, whole grains, and green leafy vegetables. As the body needs it to function correctly, it is called an essential food. They are used by people as medicine.

Complete answer:
For construction activities, such as building homes, factories, bridges, highways, airports, dams and other commercial establishments, cement is important. Manganese is often used by the steel industry in deoxidizing and desulfurizing additives and as an alloying constituent. On the other hand Manganese is an important raw material for the iron and steel industry. In this industry, roomy and heavy raw materials such as limestone, silica, alumina and gypsum are required. There are 128 large plants and 332 small cement plants in the region Iron and steel is a heavy industry where both raw materials and finished products are heavy and voluminous, resulting in heavy shipping costs.

A new method of introducing manganese in High Alumina cements can be obtained by using manganese raw materials already in mixing up the raw meal before sintering. By the addition of manganese sulphate to High Alumina cements a control of hydration similarly as by the use of gypsum can be obtained, despite other hydration products being formed. In the iron and steel industry, manganese is an important raw material since it is used to harden steel and keep it from rusting. It is found in batteries consisting of dry cells It is used in the manufacturing of a number of alloys. It is used in the electrical, glass and chemical sectors.

So the correct answer is option (C) Manganese.

Note: The ready availability of raw materials for producing cement is an essential factor that supports the growth of this industry. Using these raw materials already in the mixing of the raw meal before sintering, a modern way of introducing manganese into High Alumina cements can be accomplished.