(b) (c) (a) X The results obtained from pressure acid leaching of copper ore particles in a batch test are listed and plotted below to show that the results agree with a shrinking core kinetic model. Predict the time for complete dissolution of copper from the particles. State the assumptions used in the prediction. or 1-3 (1-x)2/+2(1-X) t/min Cu leached (%) 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 10 5.5 37 11 57 20 15 65- y=0.012x+0.009 R-0.988 1-3(1-x)2/3+2(1-X) 30 Time /min 26 78 X 40 40 86 50 [5 marks] Calculate the volume of a well mixed reactor required to leach 95% of copper from the ore (SG = 1.2) described in part (a) at a pulp density of 12% (w/w) and a solids flow rate of 12 t/h. [12 marks] Predict the volume of the reactor needed to leach 95% of copper if the particle size of the ore was decreased to half of the value in part (a) keeping the other conditions unchanged. [3 marks]