This set of Fluidization Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Roasting of Sulphide Ores”.
1. For exothermic oxidation, which technology helps in better heat distribution in the reactor?
a) Fluidized bed
b) Spouted bed
c) Using air blowers in reactors
d) None of the mentioned
View Answer
Explanation: Due to continuous flow air and back mixing, heat is distributed uniformly.
2. What are the requirements of Dorr-Oliver Fluosolids roaster?
a) Less excess air
b) Higher capacity
c) Short circuiting
d) All of the mentioned
View Answer
Explanation: They are required to encounter various problems.
3. Why do the roaster require less excess air?
a) For better roasting of sulphur ores
b) To maintain required temperature
c) To give off gas
d) All of the mentioned
View Answer
Explanation: To give off gas with higher concentration of sulphur dioxide concentration.
4. What is the main problem occurring due to back mix flow of solids?
a) Short circuiting of solids
b) Distribution of heat is interrupted
c) Irregular roasting of sulphide ores
d) Irregular distribution of solids
View Answer
Explanation: Back mixing of solids leads to short circuiting in the single-stage unit.
5. When the bed is maintained at height of 1.2m to 1.5m, how much % of cinder is entrained?
a) 75 to 80
b) 10 to 15
c) 30 to 35
d) 55 to 60
View Answer
Explanation: Since there is no Transport disengaging height provided, its leading to more entrainment.
6. In order to maintain temperature in the bed, what is introduced in the bed to maintain the temperature?
a) Water spray
b) Cooling coil
c) Coolant spray
d) All of the mentioned
View Answer
Explanation: Any of the above methods can be used to remove heat from the bed.
7. What did BASF optimized in order to get particle growth and reduce roasting time?
a) High temperature
b) Low temperature
c) Faster gas velocity
d) Low gas velocity
View Answer
Explanation: High temperature along with shallow bed and large freeboard helps in particle growth.
8. How is copper or cobalt removed from sulphide ore?
a) Leaching
b) Filtration
c) Sieving
d) Froth floatation
View Answer
Explanation: Leaching with water or sulphuric acid, copper or cobalt is removed.
9. At what temperature of the feed slug is maintained(degree Celsius) ?
a) 500 to 600
b) 880 to 930
c) 750 to 780
d) 1050 to 1150
View Answer
Explanation: For maximum roasting of ore to take place.
10. How is the temperature of slug maintained in the reactor?
a) Water
b) Sulphuric acid
c) Steam
d) Ice vapour
View Answer
Explanation: By adding water to slurry, temperature is maintained.
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