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This quiz contains multiple-choice problems on the techniques of the leaching operation.
The boiling point of the solvent is
Boiling solvent
Decoction
Leaching
None of the above
The removal of soluble materials from the solid is known as
Elution
Decoction
Extraction
None of the above
Leaching is generally used in the cement industry. True or false?
True
False
For getting leached product from copper ore, adding hydrochloric acid to the ore is mandatory. True or false?
True
False
The process of elution is also known as elutriation. True or false?
True
False
Which of the following processes can accelerate leaching?
Heating
Drying
Crushing
Crushing or grinding
If the solvent viscosity is low and the solvent temperature is high, then the leaching rate decreases. True or false?
True
False
The solvent temperature is low. True or false?
True
False
Wood ash leaching for alkali is known as
Lixation
Lixartion
Lixivation
None of the above
The term activated means
Pressure dependency
Temperature dependency
Volume dependency
None of the above
The solute movement of fluid on solids are
Hygrodynamic
Hydrodynamic
Fluid dynamic
None of the above
Macroporic surrounding of microscopic pellets powders of different magnitude in size is
Disperse
Bi-disperse
Tri-disperse
None of the above
If a polymer membrane separates the two gases, the extent of diffusion will then depend on __ law.
Hendy’s
Raoult’s
Newton’s
None of the above
To reduce the time required for removing solute, sugar beets are cut into slices known as
Cossettes
Coset
Consot
All of the above
What is the activated diffusivity of carbon if activation energy is 6 kJ and the value of constant diffusivity is 2.5 sq. m/s (e^(-6/RT) = 2.55)?
6.375 sq.m/s
1.02 sq.m/s
15.3 sq.m/s
16.25 sq.m/s
