Question

comparison of roasting and calcination​

Answer 1

Answer:

Roasting is the process in which the ore is heated below its melting point in presence of air to oxidise the impurities. Calcination is the process of heating the ore below its melting point an absence of air to remove volatile impurities like arsenic etc. ...

Calcination is the process of heating the ore below its melting point an absence of air to remove volatile impurities like arsenic etc. ...Explanation:

Kindly mark me as Brainlist

Answer 2

Roasting

When we talk about roasting, it is basically a process of metallurgy where ore is converted into its oxide by heating it above its melting point in the presence of excess air. While calcination is mostly used in the oxidation of carbonates, roasting is a method that is used for converting sulphide ores. During roasting, moisture and non-metallic impurities in the form of volatile gases are released. Process of roasting consists of solid-gas thermal reaction which includes oxidation, reduction, sulfation, chlorination and pyro hydrolysis.

Calcination

As per the popular definition, calcination is defined as the process of converting ore into an oxide by heating it strongly. The ore is heated below its melting point either in absence of air or in limited supply. This method is commonly used for converting carbonates and hydroxides to their respective oxides. During calcination, moisture and volatile impurities are also removed. Calcination can also be described as a thermal process that is used to convert ores and other solid materials by bringing about a thermal decomposition. In calcination, the reaction most of the time occurs at or above the thermal decomposition temperature.

hope it is helpful.....