PROPOSITION 2

PROPOSITION 2 of Ph.D. Natalia Petrovskaya, January 12, 2015

I have follows solutions:

1. Often Chilean ores are not very sulfide minerals (eg 3.5-6%). If depress only not valuable sulphide minerals can increase a copper grade from 0.7-0.8% to 6-9%. Minerals of Chile has 85-90% silicates. About 30% silicates has a high flotability. If depress only silicates can be increased copper grade 0,7-0-8% to 12-17%, which is much more. However, in Chile not usable the depressants for silicates with high flotability. This is a big mistake.

2. Minerals of Chile has anhydrite, which depress the molybdenite; has also soluble copper minerals that activate the pyrite. All the problems can be eliminated if some reagents to use correctly. You need to create the barrier on the surface undesirable minerals (reaents).

3. I know the much specialists of flotation. In the plants of flotation do not like change reagents. However, can be used four reagents of the same group (for example, in plants they are used four types of sulfhydryl collectors). Therefore, they like adding a reagent more, for improving flotation. Much better add depressants for silicates. But it's not as easy as it seems. Are many pitfalls. I can create the additions of flotation reagents to increase content and recovery for each plant individually (including a assortment of reagents, order of addition, quantity, etc.). Each plant has its own properties and reagents. For me no matter where is the plant of flotation in the world. If to analyze the reagent’s modes of many plants can receive the universal patent. I think so. After depression of silicates in plants ofChile can to use strong foaming that may increase a content and recovery.

4. Over the modern patents, I made a schemes for three plants of Chile for increase content and recovery of copper and molybdenum (to depress anhydrite, silicates and pyrite). If you perform these experiences, you can receive patents (can be prepare modified reagents).

5. The enterprises provides new reagents that is very safe. It may be used in place of traditional sulphidizer. However, not much information of this reagent. I started studying properties of this reagent. Its mechanism of action is as cyanide (also, I found the patents for copper leaching with this reagent), but without endangering media environment.

6. I can create schemes to improve the flotation on the each plant (add a reagent and not change all), do the experiments, analyze the results, receive patents.