Question

Explain calcination and roasting

Answer 1

Calcination use temperatures roughly twice that of typical roasting. The main idea is to use high temperatures and decompose the material being heated fairly faster. Roasting tries to changes the food products by starting and supporting a number of chemical reactions within the food that results in pleasant flavor, greater availability of certain ingredients. 

Answer 2

Calcination and roasting are processes used in metallurgy to convert ores into a more useful form. Calcination involves heating a substance to remove volatile impurities, while roasting is the process of heating an ore to decompose sulfides and remove impurities.

Calcination and roasting are both processes used in metallurgy to convert ores into a more useful form.

Calcination involves heating a substance in the presence of air or oxygen, which leads to the removal of any volatile impurities, such as water or carbon dioxide, and the conversion of carbonates into oxides. This process is commonly used in the production of lime and cement.

Roasting, on the other hand, is the process of heating an ore in the presence of excess air or oxygen.

This allows the decomposition of sulfides into oxides and the removal of any volatile impurities.

Roasting is often used in the extraction of metals, such as iron, where the ore is heated to convert it into a more suitable form for further processing.