Advertisements
Advertisements
प्रश्न
Observe the figure and name and explain in brief the following method:
उत्तर
The method shown in the figure is froth floatation method.
- The froth floatation process is based on two opposite properties of the particles, hydrophilic and hydrophobic.
- The metal sulphide particles are hydrophobic. Due to this property, they get wetted mainly with oil. On the other hand, gangue particles are hydrophilic and get wetted by water.
- In this method, the finely divided metal ore is added in a big tank containing a large amount of water. To this, certain vegetable oil (pine oil, eucalyptus oil, etc.) is added is added for the formation of froth. A rotating agitator at the centre of the floatation tank agitates the mixture and draws air into it to form bubbles. As a result, foam is formed which carries metal sulphide particles. The foam rises to the surface of water and floats. Therefore, this method is called the froth floatation process.
- This method is used to separate metal sulphide ores such as zinc blende (ZnS) and copper pyrite (CuFeS2).
APPEARS IN
संबंधित प्रश्न
Metal A has an electronic configuration of 2, 8, 1 and metal B has 2, 8, 8, 2 which is more reactive metal.
Give the effect of heat on their ?
oxides
Metal A has an electronic configuration of 2, 8, 1 and metal B has 2, 8, 8, 2 which is more reactive metal.
Give the effect of heat on their: hydroxide
Metal A has an electronic configuration of 2, 8, 1 and metal B has 2, 8, 8, 2 which is a more reactive metal.
Give the effect of heat on their: nitrates
Define the term ‘metallurgy’. State the processes involved in metallurgy ?
Explain the following term:
Gangue
With a labelled diagram, explain the electro-refining of a particular metal.
`MnO_2 + 4Al` 
…………….
`2AgNO_3`
...........................
`HgS + O_2`
..................
State two properties of brass that render it more useful for some purpose than its components.
Complete the following flow chart and answer the questions below:
i) In which method pine oil is used?
ii) Explain what method of concentration in brief.
Explain with reason:
Why is powdered coke sprinkled on top of the electrolyte?
Match the columns.
| Group A | Group B |
| 1. ZnS | a) Copper Sulphide |
| 2. HgS | b) Bauxite |
| c) Cinnabar | |
| d) Zinc blend |
Cassiterite is a copper ore.
Explain the froth floatation method with a neat labelled diagram.
The chemical name of rust is ______.
Bassemerisation is used in the extraction of ______.
