3. The lead concentrate of a particular plant analyzes PbS83.1%. FeS 79%,51O23% and remaining CaCO3. The concentrate is treated by roast-reaction method to produce Pb. The reactions during roasting stage are: 2PbS+3O2=2PbO+2SO2Pbs+2O2=PbSO44FeS+7O2=2Fe2O3+45O2 At the end roasting stare all FeS is oxidized, but some PbS remains. The formation of PbSO4 and PbO is in the ratio 1:3 by weight. During the reaction stage following reactions occur? PbS+2PbO=3Pb+5O2PbS+PbSO4=2Pb+2SO2 Both of the above reaction continues till all PbS, PbSO, has been consumed. Eind: a) Weight of the end of roasting stage and its proximate analysis/ 1000kg concentrate. b) %5 eliminated at the end of roasting stage. c) Gases formed during (i) roasting stage (ii) reaction stage in M3 at 1 atm and 273K