Conclusion and Legends

Conclusion

1. The concentrate subministered is not possible to be used directly in the lixiviation.
2. A stage of ustullation is made indispensable.
3. The best ustullated product was obtained at 680°C in two stages, the first in inert atmosphere and the second at oxidant atmosphere.
4. The higher recuperation were obtained with the following conditions: 2.5 g. 1-1 of NaCN, 33% of solids in the pulp (2/1), temperature of 70°C, in hours of testing, with the agitated and well aired pulp, the pH being of 10.7.
5. The ustullation and the temperature present a significant interaction, resulting in high recuperation. Individually they do not present the same level of effect.
6. The level of recuperation of gold and silver was above the 94% in the conditions previously mentioned.
7. The consumption of Cyanate was left at about 3 kilograms per tonneage of concentrate treated.

Legends

• 1. Ustullation oven – fluidized bed.
• 2. Cyclones.
• 3. Gas neutralizing tower.
• 4. Hose filter.
• 5. Gas converter.
• 6. Ball Knot.
• 7. Preparation of solutions.
• 8. Lix tanks (pachucas).
• 9. Thickeners – washing in countercurrent.
• 10. Leaf filter.
• 11. Airing tanks.
• 12. Tanks of precipitation.
• 13. Filter – compressor.
• 14. Dissolved deposit.