Froth Flotation (Sulphide & Oxide)

Froth Flotation (Sulphide & Oxide)2017-04-04T06:57:31-04:00
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Oxide Lead Flotation (5 replies and 6 comments)

2 years ago
mardin 2 years ago

I am working on a project to improve the flotation recovery of a mine. The mine is a lead and about 70 - 80 percent of the feed is a oxidised.  How can i improve the oxide lead flotation recovery?


2 years ago
David 2 years ago
1 like by ulemu
  • What is your recovery now?
  • What is your head grade, %Pb?
  • What is your P80 grind to flotation?
  • What reagents are you using?
  • What is the plant tonnage?
  • What is the estimated flotation residence time in your rougher circuit?
  • How many stages of cleaning?
  • What is the estimated flotation residence time in your cleaner circuit?
2 years ago

Recovery now is 65%
head grade is 4.5 % Pb
p80 is 120 mic.
reagents are Na2S- PAX- Aero 404- Feso4
the plant tonnage is 500 t/day
the flotation residence time in our rougher is about 35 min.
there are 2 stage of cleaning
the estimated flotation residence time in our cleaner circuit is about 12 min.
best regards.

2 years ago
David 2 years ago

Great stuff

  • can you give me a flowsheet?
  • is this closed or opened circuit cleaning?
  • any regrind?
  • what is the grade of your final Pb concentrate?
2 years ago

the circuit cleaning is closed
there is no regrind
the grade of our final Pb concentration is about 60%.
about the flowsheet I am sorry I have not that.

2 years ago
David 2 years ago

Mardin, thanks for the good data.

  • Have you performed any laboratory flotation tests to set a standard? 
  • What float cell size do you do your lab tests with; 3, 5, 8L?
  • How do you lab results compare to plant? 
  • What is your in-plant %mass pull VS laboratory?
  • What is your %Pb cleaner tails assay?

Without any mineralogy or Lab data, from here, I am tempted to think you do not have enough flotation time for an oxide. Particularly in your cleaner stages; only 12 minutes.

Retention time scale up factors for oxides are 3 to 4 X those used in the Lab.

Your rougher time might be OK but your cleaner time might be too short. This causes a high cleaner tails back to your rougher and eventually to rougher tails.

Your plant is a 500 TPD. 

  • Have you ever operated for 1 to 3 days at 200, 300 or 400 TPD?
  • What happens to your recoveries? 

If your plant conditions are correct/optimum, you should contact

OXFLO has the best oxide flotation reagents I know of.
Oxide collectors is his focus and speciality.

Even the best oxide flotation collector will not look good if your circuit needs longer retention times.

2 years ago

Dear David
Thanks for your answer to my problem.
I do laboratory flotation tests repeatedly, but I do not reach the Favorable result. I do my lab test with 2 L.
of course we operated for 15 day at 280 TPD. but we have not the favorable results.
what you think about Na2S (gr/t)?
and how much is pH and Eh at this Conditions؟
thanks again.

2 years ago
David 2 years ago

what is your pH and eH?

What %mass pull are you getting in  Lab?

Could you share (in a PDF) your lab test results here?

2 years ago

pH is 8.5 and Eh is -75 mv.
about 15% mass

Josh Wright
2 years ago
Josh Wright 2 years ago
1 like by David

What lead oxide minerals are we talking about? Cerussite, Anglesite, Plumbojarosite?

2 years ago

the lead oxide mineral often are cerussite but I think we have the Weathered galena.

Josh Wright
2 years ago

If you have lead sulfides, I would float those minerals first. Then if you are floating zinc sulfides (not sure if this is applicable to you), I would float these next. Finally, I would float the lead oxides. Before floating the lead oxide ores, I would consider conditioning the ore with sodium sulfide or sodium hydrosulfide. You will probably need a dosage somewhere between 500 g/t to 2500 g/t. Sulfidization floation can be tricky though, as too much sulfidizing agent, can depress both sulfide and oxide flotaiton. There are some alternative promoters besides Aero 404, that might be more effective (Aero 3738, AERO MX-3753, AERO MX-3754, and AERO MX-6207). You could also try adding sodium or ammonium phosphate with doses ranging from 500 to 2500 g/t.

Not sure if you have much Anglesite. But if you do, it tends not to respond well to flotation and may be recoverable by gravity concentration.

Your pH seems fine (8.5). I think targeting an eH could prove quite difficult, as the solution chemistry is likely complex and will contain mixed potential.

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