Concentration of Ore

Q.

In Metallurgy, which of the following terms are popular methods of concentration?

1. Hand picking

2. Froth Floatation

3. Grinding and Pulverizing

4. Deep meditation

Q.

Concentration is also called “Ore dressing” or “Benefaction”.

1. True

2. False

Q. Which of the following methods are used for concentration of ores?

1. Gravity seperation
2. Froth floatation
3. Roasting
4. Calcination

Q.

Which of the following statements is true in concentration of ore?

1. Gravity separation also called levigation and particularly suitable for heavy oxides and Carbonate ores.

2. Froth floatation process is based on solubility and is best suited for sulphide ores.

3. Electromagnetic separation is used when both ore and impurities are magnetic in nature.

4. Crushing and grinding of the ore is the physical method to concentrate the ore.

Q.

Which of the following methods are employed in the extraction of tin from cassiterite?

1. Froth floatation

2. Magnetic Separation

3. Levigation or Gravity Separation

4. All of the above

Q. Concentration is also called “Ore dressing” or “Benefaction”.

1. True
2. False

Q. Find the number of compounds that form basic flux from the ones given below:
$Si{O}_2,MgO,CaO,FeO,B_2{O}_3,CaC{O}_3$

Q. Galena (an ore) is parrtially oxidized by passing air through it at high temperature. After some time, the passage of air is stopped, but the heating is continued in a closed furnace such that the contents undergo self-reduction. The weight (in kg) of Pb produced per kg of $O_2$ consumed is

Q. Which one of the following is not a method of concentration of ore?

1. Electromagnetic separation
2. Smelting
3. Gravity separation
4. Froth floatation process

Q. The reactions which does/do not occur in the reduction zone in the extraction of iron from haematite ore is

1. $F{e}_2{O}_3+CO\to 2FeO+C{O}_2$
2. $FeO+CO\to FeO+C{O}_2$
3. $F{e}_2{O}_3+3C\to 2Fe+3CO$
4. $CaO+Si{O}_2\to CaSi{O}_3$