Question

Difference between Roasting and Calcination
Class 10

Answer 1

Explanation:

Some of the major differenc between calculation and roasting .Roasting involves heating of ore higher than its melting points in the presence of air or oxygen. Calculation involves thermal decomposition of carbonate ores.......... During calcination moisture is driven out from an ore

Answer 2

Answer:

• In the process of calcination, the ore is heated without the presence of air or with a small amount of air.
• Roasting is the process of heating or below its melting point when it's exposed to air or oxygen.
• Carbonate ores undergo thermal breakdown during calcination.
• For sulfide minerals, roasting is primarily used.
• An ore's moisture is forced out during the calcination process.
• An ore is not dried out during roasting.
• During calcination, carbon dioxide is released.
• There is a significant release of poisonous, metallic, and acidic chemicals during roasting.

Explanation:

Calcination

• Calcination is the term used to describe the process of intensely heating ore to create an oxide.
• Either without air or with a limited supply, the ore is heated below its melting point. It is usual practice to employ this technique to change carbonates and hydroxides into the corresponding oxides.
• Additionally eliminated during calcination are moisture and volatile contaminants.
• Another way to explain calcination is as a thermal process that causes a thermal decomposition in order to transform ores and other solid materials.
• Most of the time during calcination, the reaction takes place at or above the temperature of thermal breakdown.

Roasting

• By heating or below its melting point in the presence of extra air, roasting is a metallurgical process that turns ore into its oxide.
• Roasting is a technique used to transform sulfide ores, whereas calcination is typically utilized in the oxidation of carbonates. Moisture and non-metallic contaminants are emitted during roasting as volatile gases.
• Roasting is a solid-gas thermal reaction that involves the processes of oxidation, reduction, sulfation, chlorination, and pyro hydrolysis.
• The main disadvantage of this process is that a lot of metallic as well as poisonous and acidic compounds are released, which harms the environment. However, roasting, which involves sulfides, is a significant source of air pollution.

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