Rate of removal of lead from copper matte by submerged gas injection

New lead volatilisation rate and activity data in copper mattes containing low levels of Pb were determined through high-temperature experiments. Measurements on from (Cu-Fe-S) carried out at temperatures 1200 to 1570°C by injection nitrogen into shallow baths. The concentration the melts covered a range 200–6 mg.kg−1. exhibited first order behaviour with respect Pb. deduced vapour pressure gas was found be dependent accord equilibrium similar temperatures. Increasing temperature had strong influence total partial phase. Matte grade (45–83 wt%) does not have rate, but increasing sulphur potential marked impact supressing rate.