flotation Flashcards

1
Q

two major steps in floatation

A
  1. conditioning
  2. separation
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2
Q

includes any operation in which one type of solid is separated from another type by floating one of them on the surface of the fluid.

A

floating

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3
Q

the purpose of this is to create physical-chemical conditions for achieving appropriate selectivity, usually based on surface characteristics,
between particle species

A

conditioning

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4
Q

This step intended to generate and introduce air bubbles into process vessel for contacting them with particulate species

A

separation

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5
Q

In flotation, [articles attached to the air bubbles are in most applications removed from the process vessel as

A

froth

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6
Q

The unit operation of flotation is often referred to as

A

froth flotation

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7
Q

The ____________ stream is called a concentrate in the minerals industry, and the slurry underflow is termed ____________.

A

froth overflow, tailings

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8
Q

3 types of chemical reagents used in floatation

A
  1. collectors or promoters
  2. frothers
  3. modifiers
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9
Q

4 types of modifiers

A
  1. activators
  2. pH regulators
  3. depressants
  4. dispersants and flocculants
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10
Q

alter the surface of the mineral in order that it will become air-avid (to cause it to adhere to air bubbles)

A

Collectors or Promoters

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11
Q

added to strengthen temporarily covering film of the air bubbles. It serves to stabilize the froth and holds the
the concentrate launder.

A

Frothers

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12
Q

These are used to make a mineral surface amenable to collector coating.

A

Activators

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13
Q

used to control or adjust pH, a very critical factor in many flotation
separations.

A

pH regulators

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14
Q

assist in selectivity(sharpness of separation) or stop unwanted minerals from floating.

A

depressants

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15
Q

also known as deactivators which deactivates the minerals surface by resisting it towards the action of collectors.

A

depressants

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16
Q

important for the control of slimes that sometimes interfere with the selectivity and increase reagent consumptions

A

dispersants and flocculants

17
Q

in floatation, what are the known information?

A
  1. density of materials
  2. L/S, water to solid ratio
  3. floatation reagents
  4. concentration feed, tailings and concentrate
  5. floatation cells type
  6. contact time
18
Q

material balance for each unit can be used to determine

A
  1. degree of recovery
  2. size of each unit
19
Q

by using L/S ratio and contact time, ___________ can be determined

A

size of floatation tank

20
Q

Froth Flotation is most suitable for treating

21
Q

In Froth Flotation, the chemical agent added to cause air adherence is called

22
Q

Pine oil used in a flotation process acts as a

23
Q

Any operation in which one solid is separated from another by floating one of them at or on the surface of a fluid

A

floatation

24
Q

The flotation agent that prevents coalescence of air bubbles as they travel to the surface of the water is/are

A

frothing agent

25
A flotation modifier which assists in the selectivity (sharpness of separation) or stop unwanted minerals from floating.
depressant
26
Dispersants are important for the control of slimes which sometimes interfere with the selectivity and increase reagent consumption. Another term for dispersant is
deflocculant
27
An example of a collector for flotation of metallic sulfides and native metals is
xanthates
28
Which of the following is an example of a deflocculant?
lignin sulforate