Froth floatation is used for (A) Washing fine coal dust (< 0.5 mm size) (B) Washing lump coal (> 80 mm size) (C) Removing ash from the coal based on difference in specific gravity of coal and ash

Froth floatation is used for
(A) Washing fine coal dust (< 0.5 mm size)
(B) Washing lump coal (> 80 mm size)
(C) Removing ash from the coal based on difference in specific gravity of
coal and ash
by

1 Answer

Answer :

(A) Washing fine coal dust (< 0.5 mm size)
by

Related questions

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Last Answer : (D) Froth floatation

Washing of coal (A) Reduces its ash & sulphur content (B) Improves its coking properties (C) Increase the fusion point of its ash by removing chlorine compounds (D) All (A), (B) and (C)

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Iron ore hematite is concentrated using (A) Electromagnetic separation mainly (B) Gravity separation (C) Froth floatation (D) Roasting

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Pick out the correct statement.(A) Angle of repose is always greater than the angle of slide (B) A hopper is a small bin with a sloping bottom (C) A silo is a short height vessel of very large diameter used for the storage of high volatile matter coal (D) Pine oil is used as a 'modifying agent' (for activating or depressing the adsorption of filming agents) in froth floatation process

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Last Answer : (B) A hopper is a small bin with a sloping bottom

Froth floatation process used for the concentration of sulphide ore. Which of the following statements are correct (a) It is based on the difference i

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A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is A. 0.30 m/sec B. 0.35 m/sec C. 0.40 m/sec D. 0.45 m/sec

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Last Answer : ANS: D

Ore concentration by froth floatation utilises the __________ of oreparticles. (A) Density difference (B) Wetting characteristics (C) Terminal velocities (D) None of these

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The specific gravity of coal depends mainly on its __________ content. (A) Carbon (B) Volatile matter (C) Ash (D) Moisture

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. The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an (A) Bag filter (B) Electrostatic precipitator (C) Cyclone separator (D) Wet scrubber

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Last Answer : (B) Electrostatic precipitator

To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in (A) Shallow and small piles (B) Fine sizes without the presence of any lump (C) Closed space without any ventilation facility (D) Large heaps with small surface to volume ratio

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Last Answer : (A) Shallow and small piles

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Pine oil and Cresylic acid are used as __________ in the froth floatation process. (A) Frother (B) Collector (C) Depressor (D) Conditioner

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For benefication of iron ore, the most commonly used method is (A) Flocculation (B) Froth floatation (C) Jigging & tabling (D) None of these

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There is practically no alternative/competitor to __________ in the beneficiation treatment of sulphide ores. (A) Classification (B) Tabling (C) Jigging (D) Froth floatation

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Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called (A) Classification (B) Froth floatation (C) Thickening (D) Clarification

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Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator? (A) Cresylic acid (B) Copper sulphate (C) Calcium carbonate (D) Sodium carbonate

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Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother? (A) Cresylic acid (B) Xanthaies (C) Pine oil (D) All 'a' 'b' & 'c'

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Last Answer : (B) Xanthaies

Combustion of pulverised fuel (A) Requires larger combustion chamber than rich gaseous fuel (B) In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel (C) Suppresses the discharge of fine dust and grit into atmosphere (D) All (A), (B) and (C)

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Last Answer : (A) Requires larger combustion chamber than rich gaseous fuel

The liquid used for the washing of coal in an industrial coal washery is a mixture of water and (A) Carbon tetrachloride (B) Sand (40%) (C) Mineral oil of high viscosity & specific gravity (1.6) (D) None of these

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When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because :

Description : When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because :

Last Answer : When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth ... ]` D. They cannot be separated by adding NaCN

When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because :

Description : When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because :

Last Answer : When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth ... ]` D. They cannot be separated by adding NaCN

Froth floatation process for the concentration of sulphide ore is an illustration of the practical application of

Description : Froth floatation process for the concentration of sulphide ore is an illustration of the practical application of

Last Answer : Froth floatation process for the concentration of sulphide ore is an illustration of the practical ... B. absorption C. sedimentation D. cogulation

In the froth floatation process for the purification of minerals the particles float because

Description : In the froth floatation process for the purification of minerals the particles float because

Last Answer : In the froth floatation process for the purification of minerals the particles float because A. they ... by oil D. They bear an electrostatic charge.

When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because :

Description : When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because :

Last Answer : When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth floatation process as ... _(4)]` D. both (1) and (2)

Assertion : Sulphide ores are concentrated by Froth Floatation method. Reason : Cresols stabilise the froth in Froth Floatation method

Description : Assertion : Sulphide ores are concentrated by Froth Floatation method. Reason : Cresols stabilise the froth in Froth Floatation method

Last Answer : Assertion : Sulphide ores are concentrated by Froth Floatation method. Reason : Cresols stabilise the froth in Froth Floatation method

The substance used as froth stablisers in froth floatation process is :

Description : The substance used as froth stablisers in froth floatation process is :

Last Answer : The substance used as froth stablisers in froth floatation process is : A. Fatty acids B. Aniline C. pine oil D. Xanthates

Froth floatation :

Description : Froth floatation :

Last Answer : Froth floatation : A. Froth carries the mineral particles B. Froth carries gangue particles C. Froth ... by oils while gangue become wet by water.

Which of the following ores are concentrated by froth floatation?

Description : Which of the following ores are concentrated by froth floatation?

Last Answer : Which of the following ores are concentrated by froth floatation? A. haematite B. Galena C. Copper pyrites D. Magnetite

In the Froth Floatation process, zinc sulphide and lead sulphide can be separated by__________

Description : In the Froth Floatation process, zinc sulphide and lead sulphide can be separated by__________

Last Answer : In the Froth Floatation process, zinc sulphide and lead sulphide can be separated by__________ A. ... C. using depressent D. using froth stablisers

Which of the following statements is correct about the role of substances addedd in the froth floatation process?

Description : Which of the following statements is correct about the role of substances addedd in the froth floatation process?

Last Answer : Which of the following statements is correct about the role of substances addedd in the froth ... D. Froth stablisers decrease wettability of gangue.

Froth floatation process for the concentration of sulphide ore is an illustration of the practical application of

Description : Froth floatation process for the concentration of sulphide ore is an illustration of the practical application of

Last Answer : Froth floatation process for the concentration of sulphide ore is an illustration of the practical ... B. absorption C. sedimentation D. coagulateion

The froth floatation process is used for the concentration of

Description : The froth floatation process is used for the concentration of

Last Answer : The froth floatation process is used for the concentration of A. ore having low density ore ... high density D. ore having water soluble gangue

Which of the following is used as conditioner in froth floatation process

Description : Which of the following is used as conditioner in froth floatation process

Last Answer : Which of the following is used as conditioner in froth floatation process A. Pine oil B. Sodium ethyl xanthate C. Sodium carbonate D. Olive oil

The olive oil used in froth floatation process is called

Description : The olive oil used in froth floatation process is called

Last Answer : The olive oil used in froth floatation process is called A. Frothing agent B. Lubricating agent C. Conditioning agent D. Both 1 and 2

The ore that is concentrated by froth floatation process is

Description : The ore that is concentrated by froth floatation process is

Last Answer : The ore that is concentrated by froth floatation process is A. Chalcopyrites B. Cryolite C. Cuprite D. Calamine

The metallurgical process in which a metal is obtained in a fused state is called - (1) roasting (2) calcinations (3) smelting (4) froth floatation

Description : The metallurgical process in which a metal is obtained in a fused state is called - (1) roasting (2) calcinations (3) smelting (4) froth floatation

Last Answer : (3) smelting Explanation: The metallurgical process in which a metal is obtained in a fused state is called smelting.

The oil used in the froth floatation process is?

Description : The oil used in the froth floatation process is?

Last Answer : pine oil

What is the role of a stabilizer in froth floatation process?

Description : What is the role of a stabilizer in froth floatation process? 

Last Answer : Ans.: Chemical compounds like cresols and aniline which tend to stabilize the froth are called stabilizers.

What is the role of collector in froth floatation process ?

Description : What is the role of collector in froth floatation process ?

Last Answer : Ans. Collector enhances non-wettability of the mineral particles. 

Washing of coal (A) Reduces its sulphur and ash content (B) Controls its ash fusibility and increases its calorific value(C) Improves its coking properties(D) All (A), (B) and (C)

Description : Washing of coal (A) Reduces its sulphur and ash content (B) Controls its ash fusibility and increases its calorific value (C) Improves its coking properties (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Washing of coal does not reduce its (A) S & P content (B) Heating value (C) Fusion point of ash (D) None of these

Description : Washing of coal does not reduce its (A) S & P content (B) Heating value (C) Fusion point of ash (D) None of these

Last Answer : (D) None of these

A coal with high ash content (A) Has higher calorific value (B) Is harder and stronger(C) Is not subjected to washing(D) Has low quantity of mineral matter

Description : A coal with high ash content (A) Has higher calorific value (B) Is harder and stronger (C) Is not subjected to washing (D) Has low quantity of mineral matter

Last Answer : (B) Is harder and stronger