Question

Roasting process is applied to which of the following ores
1) galena
2) Ironpyrites
3) copperglance
4) all​

Answer 1

Answer:

roasting process

I think so ans is (4)

I don't know the exact answers

Answer 2

Answer:

The correct answer is option 4

Explanation:

• It is a process of metallurgy where the ore is converted into its oxide by heating it in the presence of excess air above its melting point.
• During roasting, the non-metallic and moisture impurities in the form of volatile gas are released. The roasting process contains the solid-gas thermal reaction that includes reduction, oxidation, chlorination, sulfation, and also pyro hydrolysis.
• However, roasting that involves sulphides is a major source of air pollution. The major drawback of this process is, that it releases a large amount of metallic, toxic, and acidic compounds as well, which causes harm to the environment.
• Generally sulphide ores are subjected to roasting.
• Galena : $2 \mathrm{PbS}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{PbO}+2 \mathrm{SO}_{2}$
• Iron pyrites : $4 \mathrm{FeS} \mathrm{S}_{2}+11 \mathrm{O}_{2} \rightarrow 2 \mathrm{Fe}_{2} \mathrm{O}_{3}+8 \mathrm{SO}_{2}$
• Copper glance : $2 \mathrm{Cu}_{2} \mathrm{~S}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{Cu} u_{2} \mathrm{O}+2 \mathrm{SO}_{2}$