In one roasting unit, 1000 kg of an ore concentrate of the composition given below is roasted using excess air ni3s 21% fes 40% sio2 31% h20 8% the roasting unit is heated by oil of composition 85% cand 15% h, the amount of oil is 6.2 % of the weight of the ore. the gases from combustion and roasting mix together and are carried through as flue gases s is converted to so2 the roasted product consists of nio, fe: o, and sio2 and the roasting reactions are given as; ni3s27/2023nio 250 2 2fes2 11/202 fe2o3 4s0 (i) explain how you would increase the kinetics of roasting and hence the production rate (5 marks) (i) calculate: a) weight of roasted product (10 marks) volume of the fuel oil given that its density is 0.89 g/cm2 (5 marks) b) volume of so2 in m2 (5 marks) c) (note: atomic weights are ni 59, fe 56, s 32, o= 16, h - 1 )