Concentration of Ores

IMPORTANT

Concentration of Ores: Overview

This topic covers concepts such as Leaching of Silver, Concentration or Dressing of Ores, Froth Floatation Process, Gravity Separation or Levigation, Magnetic Separation Method, Frothing Agent, Collectors, Depressants, Froth Stabilizers, etc.

Important Questions on Concentration of Ores

HARD
IMPORTANT

Match the following processes of metallurgy with their corresponding ore for which they are used:

(i) Froth floatation method                    (a) Germanium

(ii) Electrolytic refining of metals          (b) ZnS

(iii) Zone refining of metals                   (c) Copper

EASY
IMPORTANT

In the process of extraction of gold,
[X]+Zn[Y]+Au

EASY
IMPORTANT

An ore of tin containing FeCrO4 is concentrated by

EASY
IMPORTANT

Give an example of collectors.

EASY
IMPORTANT

What is the function of collectors in froth floatation process?

EASY
IMPORTANT

The oil used as frothing agent in froth flotation process is

MEDIUM
IMPORTANT

The addition of gold or silver to an alkaline sodium cyanide solution will cause the metals to react with the cyanide and dissolve them into the solution. The process is called

MEDIUM
IMPORTANT

The most appropriate term for the blank in the image below is (The image below is the process of removing gangue from sulphide ores):
Question Image

MEDIUM
IMPORTANT

What is P in the following reaction?
Al2O3.2H2O523 Khot conc.NaOHP

MEDIUM
IMPORTANT

Out of PbS and PbCO3(ores of lead), which one is concentrated by froth floatation process preferably?

MEDIUM
IMPORTANT

What is the role of depressants in the froth floatation process?

MEDIUM
IMPORTANT

Write the name of two impurities present in bauxite.

HARD
IMPORTANT

What is the use of collectors in froth floatation process?

HARD
IMPORTANT

Which of the following compounds are used in froth floatation process?

MEDIUM
IMPORTANT

Which of the following ores are concentrated by froth flotation? 

HARD
IMPORTANT

Complete the following reaction-

Al2O3 + NaOH             +             .

EASY
IMPORTANT

Complete the following reaction-      

Ag2S + NaCN                +               .

HARD
IMPORTANT

In the formation of Cr2O3, G°=-540 kJ mol-1 and for formation of Al2O3 , G°=-827 kJmol -1, will it be possible that Cr2O3 is reduced by Al. Give reasons.

HARD
IMPORTANT

Describe the Froth- Flotation process.