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Coal Preparation

Using EIS Technology to Measure the Amount of Magnetite in Dilute Magnetite Streams

Coal Preparation » Process Control

Published: July 23Project Number: C34047

Get ReportAuthor: Clint McNally, Ian Hutchinson and Shane Reinhard | CSIRO

This project focused on developing a real time measurement system for quantitatively assessing the concentration of dilute magnetite (less than 1g/L) in a magnetic separator slurry overflow.

The current method of qualitative assessment consists of using a magnetic wand and visual chart for comparison and lacks accuracy. This project aimed to build and test new configurations of electrical impedance spectrographs (EIS) and sensor cells specifically designed for dilute magnetite measurements. A mobile dilute EIS system was developed and deployed at a field site to collect real time data.

Findings indicated the need for modified EIS cell geometry and frequency span to optimise the response, as well as the need to account for water temperature and conductivity effects. The system demonstrated a close correlation with known operational events affecting magnetite concentration.

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