51. The product of a commercial direct reduction process is
52. Basicity of super-fluxed sinter is . . . . . . . .
53. Desulfurisation of hot metal is favoured by
54. An iron blast furnace produces hot metal containing 95% Fe. The iron ore charged into the furnace contains 95% Fe2O3 and the rest is gangue. Assume that all the iron in the ore goes to hot metal. The amount of iron ore (in kg) required for producing 1000 kg of hot metal is (Atomic weight of Fe = 56 g mol-1 and that of Fe2O3 = 160 g mol-1)
55. In an iron blast furnace, the sinter is added in preference to iron ore lumps because, sinter
56. Match the following blast furnace reactions with the regions where they take place. (Note that the underlined elements are present in the hot metal and the species in the parenthesis belong to slag phase).
P. Fe3O4 + CO = 3FeO + CO2
1. Hearth
Q. C + 0.5 O2 + CO
2. Tuyer
R. y . Fe + c = Feyc
3. Stack
S. C + (CaO) + S = (CaS) + CO
4. Bosh
| P. Fe3O4 + CO = 3FeO + CO2 | 1. Hearth |
| Q. C + 0.5 O2 + CO | 2. Tuyer |
| R. y . Fe + c = Feyc | 3. Stack |
| S. C + (CaO) + S = (CaS) + CO | 4. Bosh |
57. Solid raw materials required to produce a ton of pig iron is about . . . . . . . . tons
58. For efficient performance of a blast furnace, the extent of reduction of lustite should be
59. Desulfurisation of molten pig iron outside the blast furnace is carried out by the
60. Match the processes for alternate methods of producing iron in Group 1 with the type of furnaces listed in Group 2.
Group 1
Group 2
P. MIDREX
1. Rotary kiln
Q. SL/RN
2. Retort
R. Echevarria
3. Shaft furnace
S. FLOR
4. Fluidised bed
| Group 1 | Group 2 |
| P. MIDREX | 1. Rotary kiln |
| Q. SL/RN | 2. Retort |
| R. Echevarria | 3. Shaft furnace |
| S. FLOR | 4. Fluidised bed |