Froth flotation process used for the concentration of sulphide ore

• A

  Is based on the difference in wettability of different minerals

• B

  Uses sodium ethyl xanthate, C₂H₅OCS₂Na, as collector

• C

  Uses NaCN as depressant in the mixture of ZnS and PbS when ZnS forms soluble complex and PbS forms froth

• D

  Uses pine oil as frothing agent