Chapter 7: Problem 3

Discuss the following in brief. (a) Froth-flotation process (b) Roasting (c) van Arkel method

Short Answer

Expert verified

Froth-flotation process is used for ore concentration where the minerals attach to air bubbles in a water-ore suspension to be extracted. Roasting is the heating of a sulfide ore in air to convert it to an oxide or to a free metal, commonly used to remove volatile elements. The van Arkel method is a refining process for reactive metals, where the metal forms a volatile compound and is then decomposed to give the pure metal.

Step by step solution

Froth-Flotation Process

The Froth Flotation Process is used for ore concentration. The ore is crushed into a fine powder and mixed with water to produce a suspension. This suspension is then mixed with various chemicals to create conditions for the attachment of specific minerals to air bubbles. These bubbles float to the surface and create a froth, which can be skimmed off, separating the mineral from the gangue.

Roasting

Roasting is a process in metallurgy in which a sulfide ore is heated in air. The process may convert a metal sulfide to a metal oxide or to a free metal itself. It's mainly performed to remove elements such as sulfur, arsenic, and antimony as volatile oxides.

van Arkel Method

The Van Arkel Method is a process of refining metals to achieve high degrees of purity. This method is usually used to purify reactive metals like titanium, zirconium etc. The impure metal is heated with an appropriate substance so that the pure metal forms a volatile compound, leaving behind the impurities. The volatile compound is then decomposed, giving the pure metal.

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Discuss the following in brief. (a) Froth-flotation process (b) Roasting (c) van Arkel method

Short Answer

Step by step solution

Froth-Flotation Process

Roasting

van Arkel Method

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