explain hydraulic separation method...plz help guys??
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Answer:
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- This method of concentration of the ore is based on the difference in specific gravities of the metallic ore and gangue particles.
- Generally metal ores are heavier than the gangue associated with them.
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Answer:
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”. Washing ore with water is known as hydraulic washing. Gold mines make use of the hydraulic washing technique.
An upward stream of running water is used to wash powdered ore. The lighter particles of the gangue are washed away and the heavier ore is left behind. This technique separates the gangue from the ore using the difference in their specific gravities. It is, also known as gravity separation.