Stop Zinc Activation

The problem occurs when a feed with iron values from 10-11% changes to lower values. The critic case is when the iron is 6-7%. It is necessary indicate that problem does not consider the presence of copper or lead ions that can act like activator agent. Similarly, it is possible notice a trend in increase the pH value in the pulp from the mill discharge from values such as 8 to 9, or 9 to 10, which depends of pH set point and reagents used during the grinding step.

In this circumstance must be cut the addition of lime to grinding. Immediately must be increased the dosage of zinc sulphate for stopping the growth of pH, and equally must be increased the dosage of sodium cyanide for neutralizing ferric and ferrous ions presents in the slurry. The dosage of each reagent is conditioned to the characteristics of the ore [11].

Cyanide ions can form hydrophilic metal cyanide complexes which remain adsorbed at the surface [12].

According to L.A. Bushell and M.L Veitch, [13]. It is clear the effect of the dosage of sodium cyanide, while zinc sulphate only has a little effect. The dosage of sodium cyanide up to 500 ppm increased zinc recovery in almost 70%, higher additions overdepressed the zinc into the tailings. Up to 500 ppm of sodium cyanide did not affect the recovery of copper, but up to 700 ppm reduces its recovery (don’t appear in the work but is mentioned in it). In the next table is shown the results obtained by Bushell and Veitch.

Additions to mill

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