Since the ore on heating gives SO2, the ore is a sulphide ore. Steps for extracting pure metal from the sulphide ore is as follows:

i)FROTH FLOATATION PROCESS: A method used for concentration or enrichment of sulphide ore.

ii)ROASTING: Heating the ore in presence of excess of air to convert the sulphide ore into the oxide ore.

iii)REDUCTION WITH CARBON: Carbon is used to reduce the oxide of the metal into the elemental metal, by heating carbon with the ore.

iv)ELECTROLYTIC REFINING: The metals obtained are not in the pure state. They can be further purified by electrolytic refining.

Hope this helps....

Metallurgical Steps for Extraction of Metal from its Ore

1. Roasting
- Method: Roasting is the process of heating the ore in the presence of excess air or oxygen.
- Purpose: Roasting is used to remove volatile impurities, such as sulphur, arsenic, and carbon dioxide, from the ore.
- Reaction: During roasting, the ore reacts with oxygen to form metal oxide and sulphur dioxide gas (SO2).
- Example: In the case of copper, copper sulphide (Cu2S) is roasted in the presence of oxygen to obtain copper oxide (CuO) and sulphur dioxide gas as by-products.

2. Smelting
- Method: Smelting is the process of heating the roasted ore with a reducing agent in a furnace.
- Purpose: Smelting is used to extract the metal from its oxide by reducing it to the elemental form.
- Reaction: The metal oxide reacts with the reducing agent, which removes the oxygen and leaves behind the pure metal.
- Example: In the case of copper, copper oxide (CuO) obtained from roasting is mixed with carbon (as a reducing agent) and heated in a furnace. The reaction takes place as follows: CuO + C → Cu + CO.

3. Conversion to Metal Sulphide
- Method: In some cases, the metal oxide obtained from smelting is further processed to convert it into metal sulphide.
- Purpose: This step is required for certain metals that are more easily extracted from their sulphide ores than from their oxide ores.
- Reaction: The metal oxide is heated with sulphur to form metal sulphide and sulphur dioxide gas.
- Example: In the case of lead, lead oxide (PbO) obtained from smelting is heated with sulphur to form lead sulphide (PbS) and sulphur dioxide gas.

4. Electrolytic Refining
- Method: Electrolytic refining is the process of purifying the metal obtained from the previous steps by using electrolysis.
- Purpose: Electrolytic refining is used to remove any remaining impurities and obtain a high-purity metal.
- Reaction: The impure metal is made the anode, and a strip of pure metal is made the cathode. The metal ions from the anode are reduced at the cathode, while impurities settle at the bottom as anode mud.
- Example: In the case of copper, impure copper obtained from smelting or conversion to metal sulphide is subjected to electrolytic refining. The impure copper becomes the anode, and a pure copper strip is made the cathode. During electrolysis, copper ions migrate from the anode to the cathode, where they are reduced to pure copper.

Overall, the extraction of a metal from its ore involves roasting to remove volatile impurities, smelting to obtain the metal from its oxide, and further processing if required. Electrolytic refining is often used to purify the metal and obtain a high-quality end product. Each step is carefully designed to ensure efficient extraction and purification of the desired metal.