If the iron ore contains clay as an impurity, the flux added during calcination, is

__________ is used as a flux in the extraction of iron from iron ore (hametite) in blast furnace.

A

Bauxite

B

Limestone

C

Quartz

D

Manganese

Calcination of iron ores is done

A

To remove moisture

B

To remove carbonic acid

C

By roasting in heaps

D

All the above

Hematite iron ore contains iron about

A

30%

B

45%

C

55%

D

70%

Which of the following is capable of acting both as an acid flux as well as a basic flux in the metal extraction from its ore?

A

Silica

B

Lime

C

Alumina

D

Fluorite

Which is the main reducing agent during production of iron from iron ore in a blast furnace?

A

C

B

CO

C

CO₂

D

H₂

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

How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln?

A

500°C

B

750°C

C

1000°C

D

1500°C

The process of manufacturing steel by heating short lengths of wrought iron bars mixed with charcoal in fire clay crucibles and collecting the molten iron into moulds, is known as

A

Cementation process

B

Crucible process

C

Bessemer process

D

Open hearth process

The manufacture of iron from iron ore involves the process of

A

Oxidation

B

Reduction

C

Fractional distillation

D

Electrolysis

The manufacturing of iron from iron ore involves the process of

A

Oxidation

B

Reduction

C

Electrolysis

D

Fractional distillation

If the iron ore contains clay as an impurity, the flux added during calcination, is

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