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rech.chemical
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Background: Employs selective flotation method to recover copper and zinc. In bulk flotation, both copper and zinc are floated. The concentrate from bulk flotation will then go to the copper flotation circuit wherein the zinc is being depressed by sodium cyanide. The depressed zinc needs to be activated in the zinc flotation area for it to be recovered. This test will determine if the CuSO4 crystal samples are effective zinc activators.
Procedures:
1/ Obtain two liters of copper tails sample. Take note of the specific gravity and percent solids.
2/ Prepare CuSO4 and SIPX (Sodium isopropyl xanthate) solutions both at 5% strength.
3/ Put liters of copper tails sample in the flotation cell.
4/ Adjust PH to 11.5 by adding lime.
5/ Add 25ml (according to plant dosing) CuSO4, adjust PH to 11.5 again then condition for 2 minutes.
6/ Add 2ml (according to plant dosing) SIPX and condition for 2 minutes.
7/ Conduct flotation in four stages; first cleaning -10minutes, second cleaning-8 minutes, third cleaning-7 minutes and 6 minutes for the last cleaning.
8/ Maintain PH at 11.5 all throughout the flotation process.
9/ Filter out the zinc concentrate and zinc tails and weigh.
10/ Label properly.
Results: The copper sulfate crystal sample was able to meet the plant requirement for grade and recovery of copper and zinc in the zinc flotation area as can be seen in table 1 below.
Table 1 Zinc flotation results
|
Reagent |
Zn Conc |
Assay |
Recovery |
||
|
% Cu |
% Zn |
Cu |
Zn |
||
|
New CuSO4 Crystal |
Trial 1 |
3.16 |
50.2 |
51.45 |
87.21 |
|
Trial 2 |
1.02 |
55.2 |
25.85 |
71.37 |
|
|
Average |
2.43 |
51.92 |
38.65 |
79.29 |
|
|
Target |
|
<3 |
>50 |
<60 |
>70 |
Trial 1 Sample Wt Wt% Assays Distribution % Cu % Zn Cu Zn Zinc Conc 95.20 29.70 3.16 50.20 51.45 87.21 Zinc Tails 225.30 70.30 1.26 3.11 48.55 12.79 Calculated Head 320.50 100.00 1.82 17.10 100.00 100.00 Sample Wt Wt% Assays Distribution % Cu % Zn Cu Zn Zinc Conc 49.80 22.72 1.02 55.20 25.85 71.37 Zinc Tails 169.40 77.28 0.86 6.51 74.15 28.63 Calculated Head 219.20 100.00 0.90 17.57 100.00 100.00
Trial 2
Average 145.00 2.43 51.92 38.65 79.29
Target <3 >50 <60 >70
