Froth Flotation (Sulphide & Oxide)

Froth Flotation (Sulphide & Oxide)2017-04-04T06:57:31-04:00
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Reagents for Zinc Flotation (5 replies and 4 comments)

2 years ago
JohnMills 2 years ago

Dear All,

I want to carry out a pilot experiment for Zinc ore. Zn content is 10-20% with lots of Fe and Si.

Could anyone kindly recommend the cheapest and best reagents for this type of ore?

Many thanks!


2 years ago
bkalokoni 2 years ago

In what form is the Zinc? Sphalerite?

2 years ago

Hello there. Yes it is Sphalerite.

Carlos s
2 years ago
Carlos s 2 years ago

Hi John, 

Our ore has a 35% of Fe in the head, very high; we find the best cost-benefit combination is with isopropyl Xanthate in the Zn stage, another option is the propyl or butyl sodium dithiophosphates, which affect the process less by overdosing and do not need preparation facilities although they are more expensive; With the head of Zn you have, you can pay anything



2 years ago

Thanks for your response Carlos. Would I need any other chemicals for the separation process? How do I determine the right dosage to use per volume of ore?

Carlos s
2 years ago

Hi john, definitely you need to make flotation tests, you also need copper sulfate for the activation of Zinc ores; some reagents and supliers has a recomendatios for example 20 g/ton for each 1% of Zn in the head. but this es determinated in laboratory for each specific ore.
in our process we use dextrin and pH with lime in the cleaning stages, in other processes the use of sodium cyanide and pH with lime is common.

2 years ago
Robert 2 years ago
2 years ago
GP 2 years ago
1 like by David

Dear John Mills,  thank you for raising the issue. It has a lot in common with the one of my concern.

Dear Carlos and Robert, thank you for extended comments. Would you be so kind ( and maybe, JohnMills will join) to help me with the problem of Zn extraction from blast furnace gas filtration slurry

The spec is as follows:

  • loss at ignition 19,43%
  • Zn - 2,25% (target - 0,8%)
  • SiO2  - 8,54%
  • Al2O3 - 7%
  • Fe2O3 - 51,30%
  • CaO - 9,45%
  • MgO - 2,96%

I will appreciate any comments from your side about a technology and chemicals. it would be valuable to get your opinions whether this project is worth of starting and it would be feasible to do. For more details, please contact me.



2 years ago

The Zn will be oxidised in the slag so that will be difficult. Sulphidsation may work. Hydromet remains an option but gelling may limit it.

2 years ago
Robert 2 years ago


I'm happy to discuss in more details. What are your contact details?

This sounds like an issue seen before around blast furnaces.


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