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Question

Define calcination and roasting. Give one example of each?


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Solution

Calcination:

  • The calcination process occurs in the absence of oxygen.
  • It is the process in which the ore is heated to a high temperature below its melting point in the absence of oxygen
  • Moisture is removed from the ore during the calcination process.
  • Carbonate ores are calcified by this method like ZnCO3

Roasting:

  • The roasting process occurs in the presence of oxygen.
  • The process in which the ores are heated below their melting point in the presence of oxygen.
  • The impurities are oxidized to their volatile oxides while the moisture is removed from the ore.
  • Sulfide ores are roasted by this method like ZnS.

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