Froth Flotation (Sulphide & Oxide)

Froth Flotation (Sulphide & Oxide)

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NEGATIVE RECOVERY FROM A FLOTATION CIRCUIT (2 replies)

D
DARIO
7 years ago
DARIO 7 years ago

We are operating a Floatation Circuit which is showing a higher Grade in the Final Tails Compared to the Feed. As can seen from the attached report,

Feed    Grade               |       Final Tails

1.20 Cu 0.47 AsCu 1.31 Cu 0.53 AsCu

This has been going on for a long period since we started treating this material. What could be the major cause of this anomaly?

https://docs.google.com/spreadsheets/d/14a6X3DM6M1EUMIYwu6PM4PkMBVaGPkeY6Gilk-P65kg/edit?usp=sharing

https://www.911metallurgist.com/bad-recovery/

Bob Mathias
7 years ago
Bob Mathias 7 years ago
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It is called "sample contamination". If the mine and history agrees with 1.2% Cu in the feed and you know how many tonnes of copper you produced for the day, and at what grade, you go to https://www.911metallurgist.com/blog/two-product-formula-metallurgical-accounting-material-balancing and enter values until you get what your really tails assay should have been.

Look around your tailings sample point, sample preparation area, assay lab, for sources of contamination by high grade froth.

How are you getting the tailings sample?

J
Japhet
7 years ago
Japhet 7 years ago
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Sure, i do agree with Bob Mathias, one more points check the source of spillage(if any) and the sump pumps where is directed to. Is the bunds for rougher and cleaners separated? 

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