Determination of total iron content in iron ore by potentiometric titration

The total iron content in iron ore plays a central economic role for mining companies. The higher the iron content in the ore, the more worthwhile is the mining. A fast and accurate determination is therefore important.
The iron ore is dissolved in hydrochloric acid at 80 °C. Afterwards, the iron is quickly and accurately determined by potentiometric titration using the Pt-ring electrode and potassium dichromate as titrant.