Page 6 - 2. Lesson note - Ch-3 Concept mapping
P. 6

Difference b/w Calcination & Roasting-


               Calcination                                    Roasting

                   1.  Carbonates OREs are calcinated            1.  Sulphide OREs are Roasted.
                   2.  Heating of ore is done in limited         2.  Heating of or is done in
                      air                                            presence of air.
                   3.  By product is CO2 gas                     3.  By product is SO2 gas.
                   4.  Eg- CaCO3—heat→ CaO  +  CO2               4.  HgS + O2 → HgO  +  SO2









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