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Accurate measurement of solution tracer concentration in residence time distribution (RTD) tests can be difficult in low volumetric flowrate systems where solution must be accumulated over a period before there is sufficient volume for a tracer concentration measurement. This is encountered with laboratory-scale heap leaching column salt tracer RTD tests. Step-up tracer experiments were used to show how this results in tracer concentration underestimation (due to mixing effects) and loss of profile features, such as tracer concentration step changes. A tracer measurement setup was conceived to overcome this. It was designed to have well-defined flow which could be described using a compartment model of a plug flow and well-mixed volume in series. The model was used to calculate “true” tracer concentrations from the measured values (correlation coefficients greater than 0.983). It was demonstrated to be effective at both correcting tracer concentration magnitudes and restoring lost profile features.

An accurate residence time distribution measurement method for low volumetric flowrate systems, with application to heap leaching columns