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Where do you add your flotation reagents?

2026-07-24

Most plants default to one of two spots—the mill discharge or the flotation cells. And most operators assume it doesn’t matter much.

It does. And the difference can be 3–10% recovery.

Here’s why: the dosing point determines three critical factors:

🔄 Dispersion efficiency
🧲 Adsorption conditions
⏱️ Reaction time

Just a few meters along the process flow can completely change all three.

Generally, the dosing point for modifiers is prioritized over that of collectors and frothers. Since pH establishes the fundamental environment for flotation, modifiers are usually added first to set the proper conditions before collectors and frothers are introduced at the appropriate locations. This article discusses the characteristics of different dosing points for collectors.

Adding at Conditioning Tank:

✅ Best for:
- Minerals with fresh, unoxidized surfaces (higher activity → stronger adsorption)
- Ore types that are hard-to-float
- Situations where extended contact time (5–15 min) matters
✅ Extra benefit: Grinding media provides natural, uniform dispersion—no extra mixing needed.

Adding Directly to Cells:

✅ Best for:
- Pulp already adjusted to optimal pH
- Stage addition strategies (bulk in roughing, top-up in scavenging)
✅ Extra benefit: Lower total reagent consumption.

Real-world example:

In copper ore flotation, shifting xanthate addition from the cells back to the mill discharge increased copper recovery by 2.5%—with zero change in reagent type or dosage.

So how do you decide?

For oxidized ores, finely disseminated sulfide ores, or material finer than 200 mesh → conditioning tank is usually your answer.But the real key is this: your lab flotation time tests are the foundation. Get that right, and your industrial process design follows.

👉Do you currently add your collectors upstream or directly to the cells?
👉 And which ore type do you process most—sulfide, oxide, or complex?

Drop your answer below—I’ll personally respond with tailored suggestions based on your setup. 👇

Y&X Beijing Technology Co., Ltd.

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Where do you add your flotation reagents?

Reactivo de la flotación

Reactivo de la flotación de la espuma

Colectores los reactivo de la flotación

Flotación del xantato

Colector de Dithiophosphate

Isopropyl Thionocarbamate de etilo

Metilo Carbinol isobutílico