MNE 411 Final Exam Review Questions & Answers 2024/2025
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Course
MNE 411
Institution
MNE 411
MNE 411 Final Exam Review Questions & Answers 2024/2025
Dewatering is essential in a solid-liquid separation. - ANSWERSTRUE
Generally dewatering process involves sedimentation, filtration, or thermal drying. - ANSWERSTRUE
DLVO theory describes the colloidal stability of solids in solutio...
MNE 411 Final Exam Review Questions
& Answers 2024/2025
Dewatering is essential in a solid-liquid separation. - ANSWERSTRUE
Generally dewatering process involves sedimentation, filtration, or thermal drying. - ANSWERSTRUE
DLVO theory describes the colloidal stability of solids in solution. - ANSWERSTRUE
From the Schultze-Hardy rule, FeCl3 has a much larger CCC to coagulate As2S3 than that of NaCl. -
ANSWERSFALSE
Flocculants are usually long chain polymers which can bridge the fine solid particles. - ANSWERSTRUE
The solid content of the material after filtration is usually larger than that of the material after
thickening. - ANSWERSTRUE
In a thickener, the rake at the bottom helps collect and remove the settled sludge. - ANSWERSTRUE
A larger pressure drop from the feed to the far side of the filter medium is beneficial for a high filtration
rate. - ANSWERSTRUE
Multi-discs are used in rotary disc filters in order to increase the throughput. - ANSWERSTRUE
A high filtrate viscosity is beneficial for a high filtration rate. - ANSWERSFALSE - a higher filtrate viscosity
decreased the filtration rate (it is on the denominator of the equation).
Flocculants are less effective than simple salts in dealing with water treatment. - ANSWERSFALSE -
flocculants are more effective than simple salts in dealing with water treatment
, Centrifugal force is utilized for dewatering in a disc filter because the machine is rotating. -
ANSWERSFALSE - centrifugal force is utilized for dewatering in a solid bowl centrifuge because the
machine is rotating
A vibrating basket centrifuge is usually applied in coal dewatering. - ANSWERSTRUE
Solid bowl centrifuge is useful for dealing with fine particles. - ANSWERSTRUE
In a concentrator, tailings are usually pumped into a tailing pond and the 'clean' water from the pond is
recycled. - ANSWERSTRUE
To destabilize colloids stability, one has to reduce the surface (or ζ) potential of solid particles to
decrease the electrostatic repulsion between particles. - ANSWERSTRUE
Flocculants can help form sediments with a loose structure. This will reduce filter cake resistance and
increase filtration rate. Therefore, flocculants are also a kind of filtration aide. - ANSWERSTRUE
The cone shape of the discharging end of a solid bowl centrifuge is helpful for lifting the material cakes
out of slurry and it is beneficial for further dewatering. - ANSWERSTRUE
Lamella thickener has a high-capacity mainly because of the increased settling area and a significantly
reduced depth of settled particles through which water escapes. - ANSWERSTRUE
Because a much larger ΔP can be achieved, a pressure filter usually produces a much drier material cake
than a vacuum filter does. - ANSWERSTRUE
In a flotation cell, frother can help increase bubble lifetime and form relatively stable foam layer. -
ANSWERSTRUE
PZC is the pH at which oxide mineral has no surface charge. - ANSWERSTRUE
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