Category: 3. Aluminium

Aluminum is used as an important construction material, especially in developed countries. Aluminum has important properties that make it useful as a construction material.

This metal is mainly used for making parts of aircrafts, vessels, electrical wires, window frames, door frames, corrugated sheets, structural members, sheets, posts, panels etc. Other uses of aluminum are as follows.

It is rarely attacked by nitric acid, organic acids or water. It is highly resistant to corrosion.It is light in weight, soft and flexible.It is a soft metal.The melting point of aluminum is about 658°C.It has great stiffness and tensile strength (1,960 kg/cm2).Its specific gravity is about 2.70.It dissolves in hydrochloric acid.

The next process, called the Hall-Herault process, uses a steel tank, lined with a refractory material with a second layer of carbon, which forms the cathode. The electric current is supplied by carbon electrodes whose lower ends are immersed in the solution obtained by Bayer’s process. These electrodes act as anodes. When a current of…

The first process is called the Bayer process, in which the alumina in the bauxite is dissolved in a caustic soda solution, filtered and recrystallized to obtain aluminum hydroxide and pure Al2O3. is calcined.

Aluminum is extracted from bauxite in two steps. Refinement of ore to produce alumina (Al2O3).Reduction of alumina by electrolysis

Aluminum is found in abundance on Earth’s surface. It is available in various forms like oxides, sulphates, silicates, phosphates etc. But it is produced commercially mainly from bauxite (Al2O3, 2H2O), which is a hydrated oxide of aluminum. Bauxite deposits occur almost all over India, and particularly those at Balaghat, Kutni, Chhota Nagpur, Bhopal and Rewa…