| |
Compound |
 (kcal/kg mol) |
Cu2S |
-18950 |
ZnS |
-44000 |
FeS2 |
-35500 |
FeS |
-23100 |
CO2 |
-94450 |
CO |
-26840 |
Cu2O |
-42500 |
CuO |
-38500 |
ZnO |
- 83500 |
PbO |
-52500 |
|
For example
(c) is condensed and (g) is gaseous phase
This reaction produces heat at 298K
Combustion of fuel
In the ore concentrate solid fuel is mixed for roasting. Solid fuel contains carbon and hydrogen besides other elements. Fuel is characterized by calorific value. Gross calorific value of a solid fuel can be calculated by
Gross calorific value 
.
If the coal analyses  moisture  and ash  , GCV of coal is  .
Determination of calorific value of gaseous fuel
In determination of gaseous fuel, combustible components are:  , hydrocarbons,  etc., whereas  are diluents.
Heats of formation of some oxides are :
Oxides |
 (1 atm, 298K)kcal/kgmol
|
CO |
29.6x103 (C Amorphous) |
CO |
26.4x103 |
CO2 |
97.2x103 (C Amorphous) |
CO2 |
94.05x103 |
H2O(l) |
68.32x103 |
H2O(v) |
57.80x103 |
SO2(g) |
70.96x103 |
SO3(g) |
94.45x103 |
|
|
