Froth Floatation

Q.

Froth floatation process for the concentration of ores is an illustration of the practical application of

1. (a) adsorption

2. (b) absorption

3. (c) coagulation

4. (d) sedimentation

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.

Which ore is concentrated by froth floatation?

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. Froth floatation process is based on the wettability of the minerals

1. True
2. False

Q.

Generally, for which of the following ores, froth floatation method is used for concentration?

1. Horn silver

2. Bauxite

3. Cinnabar

4. Haematite

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

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

Q. $NaCN$ is sometimes added in the froth flotation process as a depressant when $ZnS$ and $PbS$ are to be separated in the given sample because:

1. $Pb(CN{)}_2$ is precipitated, no effect on $ZnS$
2. $ZnS$ forms a soluble complex, $PbS$ goes up with the froth
3. $NaCN$ reacts with $ZnS$ to form $N{a}_2\left[Zn\right(CN{)}_4]$
4. $Zn(CN{)}_2$ is precipitated, no effect on $PbS$

Q. Which of the following ores is best concentrated by froth floatation?

1. Siderite
2. Galena
3. Malachite
4. Magnetite