There is practically no alternative/competitor to __________ in the beneficiation treatment of sulphide ores.

Concentration of sulphide ores is done usually by

A

Roasting

B

Smelting

C

Froth floatation

D

Electro magnetic separation

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 of the above

Fluid medium used in the classification technique of mineral beneficiation is

A

Air

B

Water

C

Both A & B

D

Neither A nor B

__________ flux is used for the extraction of metal from its self fluxing ores.

A

No

B

Acid

C

Basic

D

Neutral

If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is

A

Charged

B

Short-circuited

C

Lossy

D

Satisfactory

__________ practically possess no elasticity.

A

Vulcanite or ebonite

B

Spandex fibre

C

Polysulphide rubber

D

Epoxy resin

The alloying element which reduces the formation of iron sulphide in steel is

A

Chromium

B

Nickel

C

Vanadium

D

Manganese

The product (s) of roasting of a sulphide ore is (are)

A

Oxide only

B

Sulphate only

C

Oxide and sulphate

D

Dependent on temperature and partial pressure of oxygen & sulphur dioxide

Which of the following metals can not be extracted by pyrometallurgical process from its sulphide ore?

A

Copper

B

Mercury

C

Lead

D

None of these

Zinc sulphide is commonly used as

A

Fungicide

B

Herbicide

C

Rodenticide

D

Deodorant

There is practically no alternative/competitor to __________ in the beneficiation treatment of sulphide ores.

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