The statement that is NOT correct is

• Correct answer
  A

  Collectors enhance the wettability of mineral particles during froth flotation.
• B

  Copper from its low grade ores is extracted by hydro metallurgy.
• C

  A furnace lined with Haematite is used to convert cast iron to wrought iron.
• D

  In vapour phase refining, metal should form a volatile compound.

Hence, the correct answer is option: 'A'.