Floatation and Flocculation Flashcards by OLIVEROS, ADRIAN AGASSI

This is a separation process commonly used in the mining and mineral processing industries.

A. Flotation
B. Flotation Agents
C. Flotation Cells
D. Flocculation

Flotation

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These cells provide the necessary environment for air bubbles to interact with hydrophobic particles, causing them to rise to the surface for collection

A. Surface Chemistry
B. Reagents
C. Flotation Cells
D. Air Bubbles

Flotation Cells

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Do not use mechanical agitation but rely on the introduction of air under pressure

A. Surface Chemistry
B. Pneumatic cells
C. Flotation Cells
D. Air Bubble

Pneumatic cells

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Described as one of the early types of flotation cells used in the mineral processing industry; it was oldest and simplest but is now practically obsolete.

A. Mechanical Flotation Cells
B. Pneumatic Flotation Cells
C. Hybrid Flotation Cells
D. Simple Callow flotation cell

Simple Callow flotation cell

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The size range of materials treated in floatation

A. from 10 mesh to below 120 mesh
B. from 40 mesh to below 200 mesh
C. from 20 mesh to below 200 mesh
D. from 60 mesh to below 240 mesh

from 20 mesh to below 200 mesh

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Particles that attract water

A. Hydrostatic
B. Hydrophobic
C. Hydrophilic
D. Hydroponics

Hydrophilic

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Particles that repel water.

A. Hydrostatic
B. Hydrophobic
C. Hydrophilic
D. Hydroponics

Hydrophobic

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This loss in _______ is a measure of the wettability of the solid phase by the air and there- fore an indication of the floatability.

A. Energy
B. Power
C. Orthokinetic
D. Surface

Energy

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In From Flotation, chemical agent added to cause ar adherence le called

A. Frothers
B. Modifier
C. Collectors
D. Promoter

Collectors

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Chemicals used to control the flotation environment and adjust the interaction between collectors and the mineral surfaces.

A. Frothers
B. Modifier
C. Collectors
D. Promoter

Modifier

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This kind of methyl isobutyl carbinol (MIBC).

A. Polyglycols
B. Frothing Agents
C. Alcohols
D. Frothers

Alcohols

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Widely used for sulfide minerals such as copper, lead, and zinc. They form a hydrophobic layer on the mineral surface

A. Xanthates
B. Fatty Acids
C. Frothers
D. Amine Compound

Xanthates

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Amine Compounds are used for ________ and oxide minerals.

A. Silicate
B. Fluorite
C. Phosphate
D. Fatty Acid

Silicate

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Frothing Agents is specifically designed compounds like _______

A. Fluorite
B. Silicate
C. Pine oil
D. Oil

Pine oil

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They ensure that air bubbles are evenly distributed and have sufficient stability to carry the hydrophobic particles to the surface. Common frothers include:

A. Xanthates, Fatty Acids and Amine
Compounds.
B. Activators, Depressants and pH
Regulators.
C. Collectors, Frothers and Modiers
D. Alcohol, Polyglycols and Frothing
agents

Alcohol, Polyglycols and Frothing
agents

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Are substances that help produce a stable froth layer at the top of the flotation cell

A. Collectors
B. Modifier
C. Promoters
D. Frothers

Frothers

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Modifiers are chemicals used to control the flotation environment and adjust the interaction between collectors and the _________

A. Surface Chemistry
B. Flotation Cells
C. Air Bubbles
D. Mineral Surface

Mineral Surface

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According to the report, what determines whether particles attach to air bubbles and float in flotation?

A. Particle size
B. Temperature
C. Electrical Conductivity
D. None of the Above

None of the Above

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What is discharged as tailings in the flotation process?

A. Froth layer
B. Valuable minerals
C. Depleted slurry
D. Hydrophobic particles

Depleted slurry

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In which application is flotation used to concentrate sulfide ores of copper, lead, and zinc?

A. Recycling
B. Wastewater treatment
C. Agriculture
D. Mineral Processing

Mineral Processing

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What distinguishes a Jameson cell from a mechanical flotation cell?

A. It uses mechanical agitation.
B. It relies on air pressure.
C. It has a high-shear environment.
D. It uses a sparger for air introduction.

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It has a high-shear environment

Flotation relies on the relative adsorption or __________ of solid surfaces by the fluid, which is controlled by surface or interfacial energy, where interfacial tension
plays a critical role.

A. Dry of Solid Surface by the fluid
B. Wetting of Solid Surface by the fluid
C. Dry Air
D. None of the above

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Wetting of Solid Surface by the fluid

The effectiveness of flotation depends on the differences in the surface chemistry of the materials to be separated

A. Surface Chemistry
B. Reagents
C. Flotation Cells
D. Air Bubbles

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Surface Chemistry

is fed to a flotation cell termed the rougher, where the first or rough separation by flotation is made

A. Rougher
B. Reagents
C. Bubbles
D. Conditioner

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Conditioner

The other material which sinks in the water and is removed from the bottom is called ________ ? A. Tailings B. Scavenger C. Ball mill D. Feed

Tailings

The aggregation of particles to form larger clusters A. Floatation B. Screening C. Coagulation D. Flocculation

Flocculation

Destabilize particles by reducing its repulsive charges A. Floatation B. Screening C. Coagulation D. Flocculation

Coagulation

Chemical additives that cause suspended solids to form aggregates called flocs. A. Flocculating agents B. Chelating agents C. Floatation agents D. Oxidizing agents

Flocculating agents

Which of the following is a primary mechanism driving perikinetic flocculation? A. Gravity B. Centrifugal force C. Brownian Motion D. Electrical charge

Brownian Motion

The person who developed the model for perikinetic flocculation, focusing on the diffusional flux of particles towards a stationary particle. A. Francis Buttowski B. Von Smoluchowski C. Yerachmiel Argaman D. Warren Kaufman

Von Smoluchowski

This random movement that causes particles to come into contact with each other in perikinetic flocculation. A. Radial diffusion B. Osmosis C. Centrifugal motion D. Brownian motion

Brownian motion

The movement of particles towards a central particle in a radial direction A. Radial diffusion B. Osmosis C. Centrifugal motion D. Brownian motion

Radial diffusion

What is the significance of flocculation in water treatment, particularly in the context of contact flocculation- direct filtration, as emphasized in the report? A. It reduces the need for granular bed filters. B. It facilitates the removal of suspended particles during filtration. C. It increases the requirement for extensive coagulation stages D. It enhances the efficiency of sedimentation processes.

It facilitates the removal of suspended particles during filtration.

What is the recommended design rate for reverse graded filters in direct filtration? A. Up to 20 m h–1 B. 36 to 58 m h–1 C. 10 m h–1 D. 25 m h–1

10 mh–1

Which type of filter media configuration is NOT advised for normal direct filtration rates ranging from 10 to 18 m3 m–2 h–1? A. Single-media sand filters B. Dual-media anthracite and sand filters C. Mixed-media sand, anthracite, and garnet filters D. Mixed-media anthracite, sand, and garnet filter

Single-media sand filters

Which stage of the filtration process involves various factors such as interception, settling, diffusion, and hydrodynamic forces? A. Transport B. Attachment C. Coagulation D. Sedimentation

Transport

What is a significant advantage of direct filtration over conventional methods, as highlighted in the report? A. Reduction in filter backwash water usage B. Increase in filter run times C. Cost Reductions D. Higher removal efficiency for suspended solid

Cost Reductions

What is the primary disadvantage associated with direct filtration in terms of operational challenges? A. Higher capital costs B. Shorter filter runs C. Lower backwash water usage D. Reduced chemical usage

shorter filter runs

Which factor primarily contributes to the reduced operational and maintenance costs associated with direct filtration? A. Increased chemical usage B. Minimal equipment required C. Longer filter runs compared to traditional methods D. Lower backwash water usage

Minimal equipment required

Which parameter is used to optimize filter operation in direct filtration systems according to the report? A. Suspended solids concentration B. Turbidity level C. Hydraulic head loss D. Filtration rate

Hydraulic head loss

Which operational aspect of direct filtration is recommended, especially for waters with elevated iron concentrations or when polyelectrolytes are used, according to the report? A. Lowering backwash rates B. Increasing filter run times C. Implementing surface wash or air scour D. Reducing filter media size

Implementing surface wash or air scour

What process occurs when suspended particles adhere to the grain surfaces or existing deposits within the filter bed? A. Attachment B. Sedimentation C. Coagulation D. Transport

Attachment

What is flocculation? A. The process of breaking down large particles into smaller ones. B. The aggregation of particles to form Larger clusters. C. The chemical reaction that dissolves particles in a fluid. D. The process of separating solids from liquids by sedimentation.

The aggregation of particles to form larger clusters

What is the difference between flocculation and coagulation? A. Coagulation destabilizes particles, while flocculation aggregates them into flocs. B. Coagulation involves particle aggregation, while flocculation involves particle dispersion. C. Flocculation occurs before coagulation. D. Flocculation and coagulation are identical processes.

Coagulation destabilizes particles, while flocculation aggregates them into flocs.

Flocculation uses _____ to form aggregates from suspended solids. A. flocculating agents B. flocs C. alums D. coagulants

flocculating agents

In water treatment, flocculation is used to remove _____. A. Floating particles B. Suspended sediments C. Bubbles D. Froth

Suspended sediments

All are types of flocculants, except? A. Inorganic Flocculants B. Organic Flocculants C. Monomeric Flocculants D. Polymeric Flocculants

Monomeric Flocculants

All are types of polymeric flocculants, except? A. Anionic polymers B. Cationic polymers C. Ionic polymers D. Nonionic polymers

Ionic polymers

In perikinetic flocculation, what is the role of Brownian motion? A. It causes particles to settle at the bottom. B. It induces random movement leading to particle collisions. C. It generates heat to dissolve particles. D. It increases the viscosity of the fluid.

It induces random movement leading to particle collisions

In the context of perikinetic flocculation, What does the term 'radial diffusion' refer to? A. The movement of particles towards the fluid surface. B. The movement of particles away from a central point. C.The movement of particles in a circular motion. D. The movement of particles towards a central particle in a radial direction

The movement of particles towards a central particle in a radial direction

Floatation and Flocculation Flashcards

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