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SPECIALIST EQUIPMENT


Fig. 1. Naturally fl oating gangue mineral in this process


Fig. 2. Gangue


locked in valuable mineral


Fig. 3. Recovered as entrained fi nes


Fig. 4. Other


reasons, including process effi ciency


situation is to adopt a regrind step to liberate the spaherite prior to recleaning.


Recovered as entrained fi nes It is important to minimise Cr content in fl otation concentrate in South African UG2 Platinum fl otation operations. In this concentrate the Cr is present as chromite and 92% of the chromite is fully liberated. 73% is smaller than 10 micron and 20% is in the 10 to 212 µm fraction. T e problem was improved with the choice of a diff erent collector and specifi c depressant.


Recovered as larger particles in a non- draining froth A gold fl otation plant fl oats pyrite to recover the gold locked in the pyrite. T e concentrate is leached to recover gold. T e volume of concentrate needs to be reduced to increase


48 www.engineerlive.com


leach residence time. Quartz was found to be the main gangue mineral, was well sized and liberated. Changing the frother gave a more mobile drainable froth and reduced the gangue content in the concentrate.


Other reasons, which may include process effi ciency A South African UG2 reef PGM fl otation plant experienced poor concentrate grades. MLA analysis showed that 83% of chromite was present as well sized liberated particles. T is was a recent phenomenon as earlier analysis had shown 33% being present as such. It was concluded that the process was out of balance and steps were taken to control process fl ows which resulted in a return to normal levels of Cr in the fl otation concentrate. ●


Simon Isherwood is with Nasaco. www.nasaco.ch


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