Question
Compare the process of calcination and roasting.

Answer

Comparison of calcination and roasting :
CalcinationRoasting
  • It is the process of heating the ore
    to a high temperature in the
    absence of air, or where air does not take part in the reaction.
  • The process of heating the concentrated ore in the presence of air to a high temperature so as not to melt it is called roasting.
  • Usually carbonate ores or ores containing water are calcined.
  • Usually sulphide ores are roasted.
  • Organic matter, if present in the ore, gets expelled and the ore becomes porous.
  • The impirirties of P, As and S are removed as their oxides which being volatile, escape as gases.
  • It is done in reverbratory furnace The holes of the furnace are kept closed.
  • It is also done in reverbratory furnace but the holes of the furnace are kept open to allow the entry of air in to the furnace.

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