A purple coloured non-metal forms a brown solution in alcohol which is applied on wounds as an antiseptic. Name the non metal.
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An ore contains a metal associated with other undesired substances like sand, clay, etc. These undesired substances are collectively known as gangue (or) matrix. The process of separating gangue from an ore is known as concentration of the ore. It is also called dressing or benefaction.
Metals can be concentrated from their ores using any of these methods - hydraulic washing, magnetic separation, froth floatation or leaching.
The choice of the technique used for extraction depends upon the differences in the physical properties of the compound of the metal present and that of the gangue. The type of metal, the facilities available and environmental factors are also taken into consideration.
1. Hydraulic washing
The name hydraulic means “operated by the pressure created by forcing water (or) another liquid”.
2.Magnetic separation
Magnetic separation is used when either the ore (or) the impurities in it are magnetic in nature.
Ex: Separating iron from its ore hematite
3. Forth Flotation:
Froth flotation separates the gangue particles from the ore, based on the fact that gangue is wetted by water, while mineral is wetted by oil.
A collector is a substance, such as pine oil (or) a fatty acid, which enhances the non-wettability of the ore particles.
An ore contains a metal associated with other undesired substances like sand, clay, etc. These undesired substances are collectively known as gangue (or) matrix. The process of separating gangue from an ore is known as concentration of the ore. It is also called dressing or benefaction.
Metals can be concentrated from their ores using any of these methods - hydraulic washing, magnetic separation, froth floatation or leaching.
The choice of the technique used for extraction depends upon the differences in the physical properties of the compound of the metal present and that of the gangue. The type of metal, the facilities available and environmental factors are also taken into consideration.
1. Hydraulic washing
The name hydraulic means “operated by the pressure created by forcing water (or) another liquid”.
2.Magnetic separation
Magnetic separation is used when either the ore (or) the impurities in it are magnetic in nature.
Ex: Separating iron from its ore hematite
3. Forth Flotation:
Froth flotation separates the gangue particles from the ore, based on the fact that gangue is wetted by water, while mineral is wetted by oil.
A collector is a substance, such as pine oil (or) a fatty acid, which enhances the non-wettability of the ore particles.
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