Metallurgy

What is the main ore of aluminum?

• Al₂O₃.n H₂O

• Al₂SO₄.n H₂O

• Al(OH)₃.n H₂O

• Al₃O₄.n H₂O

Select all that apply:

Which of the following are the steps involved in Electrolytic Reduction of Alumina?

• Addition of Cryolite and Flourspar

• Replacement of cathode

• Replacement of anodes

• Formation of aluminum at cathode

• Formation of carbon dioxide at anode

In Bayer's Process impurities like __________ are removed when the ore is reacted with concentrated caustic soda.

Sulphide ores are concentrated using ______ method.

• Wilfley Table

• Hydraulic Separation

• Magnetic Separation

• Froth Floatation

• Leaching

Carbonate ores are first ____________ and converted into oxide ores.

• Roasted

• Calcinated

• Combusted

• Neutralized

Select all that apply:

Impurities present in bauxite are:

• Copper pyrite

• Ferrous tungstate

• Silica

• Ferric oxide

• Titanium oxide

Identify the diagram:

• Separation based on gravity

• Magnetic separation

• Forth floatation

• Leaching

In order to reduce zinc metal from its oxide __________ is used.

Kalhaee is coating a layer of _____________ over copper or brass.

• zinc

• aluminium oxide

• tin

• silver

Select all that apply for the definition of gangue:

Ores contain many types of impurities such as _____, _____ and ________ along with the metal compounds. These impurities are called gangue.

• soil

• sand

• rocky substances

• metallic contents

• moisture