MATERIALS & HANDLING


YOUR PYRITE CONTROL


CHECKLIST: Operate at high pH, especially in the mill Use high-chrome steel grinding media


Avoid overdosing xanthate and consider combining xanthate with a more selective collector such as NASCOL 201 (thionocarbonate)


SILVER = C0.M0.Y0.K30


DARK BLUE = C90.M50.Y5.K40 LIGHT BLUE = PMS285 or C91.M53.Y0.K0


Pyrite depression changes the surface properties of minerals


Orange = C0.M56.Y92.K0


other minerals by inhibiting its ability to fl oat.


NASACO’S SOLUTION A solution from chemical specialist Nasaco is a reagent called Nasmin 1032, The product is engineered for safety, performance, and sustainability, and tackles depression by stripping copper from pyrite surfaces – like cyanide, restoring it to ‘normal pyrite’.


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Tailor oxygen conditioning times to your pyrite’s reactivity


Use a cure method like Nasmin 1032 to remove copper-activation Check for locking with mineralogical services


For use in layouts where the logo will be placed on a dark color field such as technical services gray.


LIGHT BLUE = PMS285 or C91.M53.Y0.K0 SILVER = C0.M0.Y0.K30


It also reduces pulp electropotential, which limits oxygen’s role in dixanthogen formation. In addition, Nasmin 1032 is non-toxic and non-volatile.


LOCKED PYRITE If the pyrite is locked in Cu-sulphides, Ni-sulphides or similar value minerals, it will fl oat with the host mineral. Where pyrite recovery is still an


issue after optimising pH, grinding media and reagents, an operator should check for pyrite locking using a scanning electron microscope. Nasaco helps its clients determine the level of locking and fi nd possible solutions.


For more information visit: www.nasaco.ch


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