Comparison of Different Pyrrhotite Depressants in Pentlandite Flotation
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چکیده
Nickel producers have been using a number of different strategies, sometimes in combination, to reject pyrrhotite. These include raising the pH of flotation to partially suppress pyrrhotite floatability (73), introducing separate pyrrhotite rejection circuits which by and large also exploit the fact that pyrrhotite floats poorly in alkaline solutions, and using magnetic separation to remove pyrrhotite from feed or concentrate streams (74, 75). These measures made significant improvements. For example, the pyrrhotite rejection at INCO's Thompson concentrator increased the pyrrhotite rejection from 5 to 60 percent (76). However, none is entirely satisfactory, as high levels of pyrrhotite rejection are invariably accompanied by unacceptable pentlandite losses.
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