Question

What are the distinguishing features of each extraction process: pyrometallurgy, electrometallurgy, and hydrometallurgy? Explain briefly how the types of metallurgy are used in the production of(a) Fe;

Answer 1

1.Pyrometallurgy

• This techniques involves the high temperature at which the Chemical reactions took place between the gases and solids.

• Pyrometallurgy involves calcination, Roasting and smelting process.

 

 2.Electrometallurgy

• This technique involves the metallurgy operations that took place in electrolytic cell.

• Electro- winning and Electro-refining are some of the electrometallurgy process

  3. Hydrometallurgy

• Reactions involves aqueous solutions to extract metal, use this technique.

• Hydrometallurgy involves precipitation , distillation , adsorption and solid extraction operations.

Now,

Type of metallurgy are used in the production of Fe is Roasting and Smelting.

What is Roasting?

• Ore is heated strongly with other substances, usually with Oxygen.
• Process temperature is below the melting point.
• Some of Impurities is removed as volatile substance.

In this reaction,

 FeO changes to Fe₂O₃ to prevent the loss of iron during smelting.

4FeO +O₂→ Fe₂O₃.

Now,

  What is Smelting?

• The oxides of less electropositive metals like Pb, Zn, Fe, Sn, etc.
• These are reduced by strongly heating with coal or coke.
• Reduction of the oxide with Carbon at high temperature is known as Smelting.

Thus from the above conclusion we can say that , metallurgy are used in the production of Fe is Roasting and Smelting.

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