Engineering Theory of Leaching

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The Problem• given lab scale batch results, predict conversion as afunction <strong>of</strong> reactor size for a commercial installation• historically, we have always sought continuousresults in order to design a full scale reactor, so nomagic was required: simply translate mini-pilot smallscale continuous autoclave leach curve to full scale,and allow a safety factor.2
Scale-up• we have to be able to accurately predict how eachvariable affects the process outcome• we need to be in control <strong>of</strong> the major variables for theprocess• difficulties occur when we cannot make thisprediction in going from laboratory results tocommercial scale3
Page 1: Engineering Theory of LeachingAn ap
Page 5 and 6: Major Process Variables (cont’d)
Page 7 and 8: Moving Forward• A procedure that
Page 9 and 10: 9Generic RTD curve
Page 11 and 12: 11Dispersed Plug Flow Model
Page 13 and 14: Tracer Tests• Can determine RTD f
Page 15 and 16: Step Input Tracer Test• Requires
Page 17 and 18: Fluid Behaviour andBatch Reactor Ki
Page 19 and 20: Macrofluid Behaviour andCSTR Kineti
Page 21 and 22: Leaching Particle Batch/ContinuousK
Page 23 and 24: With Correspondence inKinetics Esta
Page 25 and 26: Utility of Method• This approach
Page 27: Example batch-to-continuouscalculat
Page 30: 30Batch oxidation results at 185 o
Page 34 and 35: 34To normalize, all the zinc concen
Page 38: 38In the final columns, we form the

Engineering Theory of Leaching

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