The process employed for the concentration of sulphide ore is

• Froth Floatation Method is used for removing gangue from sulphide ores.
• This method employs a mixture of water and pine oil which is made to froth in a tank to separate sulphide ores.

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Additional InformationRoasting:

• Roasting is the process of heating a sulfide ore to a high temperature in the presence of air. 
• During roasting, the sulfide is converted to an oxide, and sulfur is released as sulfur dioxide, a gas.

Calcination:

• Calcination refers to heating (thermal treatment of) carbonate ores to high temperatures in absence or limited supply of air or oxygen (O₂).
• The purpose of calcination is to remove impurities or volatile substances and/or to incur thermal decomposition.

Electrolysis:

• The electrolysis can be done on a molten metal oxide to production of pure metal.