Froth Floatation

Q.

Write a short note on froth floatation process.

Q.

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the coreect answer out of the following choices.
(a) Both assertion and reason are true and reason is the coreect explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Assertion is false but reason is true.
(e) Assertion and reason both are wrong.
Assertion (A) Sulphide ores are concentrated by froth flottion method.
Reason (R) Cresols stabilise the froth in froth floatation method.

Q. Froth floatation process used for the concentration of sulphide ore:

1. Is based on the difference in wettability of different minerals
2. Uses flouspar for concentrating
3. Uses sodium chloride as depressent
4. Uses mustard oil as frothing agent

Q. The main function of a frother is:

1. To stick to the ore and then take it to the top
2. To make the insoluble ore soluble
3. To make the ore hydrophobic
4. None of these

Q.

What is the role of depressant in froth floatation process?

Q.

Four faradays of electricity were passed through AgNO₃ (l), CdSO₄(l), AlCl₃(l), & PbCl₄(l) kept in four vessels using inert electrodes. The ratio of moles of Ag, Cd, Al, & Pb deposited will be

A. 12 : 4 : 6 : 3

B.12 : 6 : 4 : 3

Q. $NaCN$ is sometimes added in the froth flotation process as a depressant when $ZnS$ and $PbS$ minerals are expected because ______.

1. $Pb(CN{)}_2$ is precipitated while no effect on $ZnS$.
2. $ZnS$ forms soluble complex $N{a}_2\left[Zn\right(CN{)}_4]$ while $PbS$ forms froth
3. $PbS$ forms soluble complex $N{a}_2\left[Pb\right(CN{)}_4]$ while $ZnS$ forms froth
4. $NaCN$ is never added in froth floatation process

Q.

Name the process by which sulphide ores are concentrated?

Q. Which of the following is commonly used to produce foam in froth floatation process?

1. Pine oil
2. Cresol
3. $NaCN$
4. Xanthate

Q.

Removal of impurities from ore is known as

1. Crushing and grinding

2. Concentration of ore

3. Minerals

4. Gangue

Q.

Question 33
How do we separate two sulphide ores by froth floatation method?
Explain with an example.

Q. In presence of PbS and ZnS in a mineral the froath floatation process require NaCN because-

1. PbS forms soluble complex $N{a}_2\left[Pb\right(CN{)}_4]$
2. ZnS goes into the solution as soluble complex $\left[Zn\right(CN{)}_4{]}^{2–}$
3. $Zn(CN{)}_2$ is precipitated
4. ZnS forms insoluble complex $\left[Zn\right(CN{)}_4{]}^{2-}$

Q. Under what soil conditions do you think a farmer would treat the soil of his fields with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate).

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

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

Q. Froth flotation $\to$Roasting$\to$Reduction$\to$Electrolysis
The above processes are used in the extraction of:

1. Cu from $CuFe{S}_2$
2. Zn from $ZnS$
3. Fe from $F{e}_2{O}_3$
4. Al from $A{l}_2{O}_3.2H_{2}O$

Q.

How is leaching carried out in case of low grade copper ores?

Q. Which of the following methods is based on the principle of the difference in the wetting properties of the ore and gangue particles with water and oil?

1. Magnetic separation
2. Froth floatation process
3. Hydraulic washing
4. None of these

Q. What is the role of depressant in froth floatation process?

Q. Write short notes on froth floatation process?

Q.

What is the role of depressant in froth floatation process?

Q. Give the principle of froth floatation.

Q. Froth floatation process for the concentration of ores is an illustration of the physical phenomenon of:

1. Adsorption
2. Coagulation
3. Absorption
4. Sedimentation

Q. What is the role of collectors in froth flotation process?

Q. Identify the correct statement from the following:

1. Vapour phase refining is carried out for Nickel by Van Arkel method.
2. Wrought iron is impure iron with $4\%$ carbon.
3. Blister copper has blistered appearance due to evolution of $C{O}_2$
4. Pig iron can be moulded into a variety of shapes.

Q. Which one of the following ores is best concentrated by froth flotation method?

1. Galena
2. Cassiterite
3. Magnetie
4. Malachite

Q.

Match the items of Column I with the items of Column II and assign the correct code.
$\begin{array}{cc}& \\ ColumnI& ColumnII\\ A.Sapphire& 1.A{l}_2{O}_3\\ B.Sphalerite& 2.NaCN\\ C.Depressant& 3.Co\\ D.Corundum& 4.ZnS\\ & 5.F{e}_2{O}_3\end{array}$
Codes
A B C D A B C D
(a) 3 4 2 1 (b) 5 4 3 2
(c) 2 3 4 5 (d) 1 2 3 4

Q.

What is demulsification?

Q. Which of the following ores are concentrated by Froth Flotation.

1. Oxide ores
2. Sulphide ores
3. Nitride ores
4. Chloride ores

Q. Why is pine oil used in froth floatation method?

Q. Which ore is concentrated by froth flotation method?

1. Bauxite
2. Cinnabar
3. Horn silver
4. Haemattie