Home » Mineral process » Flotation Process » 7 Common Problems and solution...

7 Common Problems and solutions of Froth Flotation Method

xinhai 2019-12-13(15:51:03) 2999

Warm Tip: If you want to know more details about equipment, solutions, etc, please click the button below for free consultation, or leave your requirements!

Flotation Plant

This is a guide to froth flotation problems and solutions.

In this new guide, you'll learn all about:

  • Poor flotation effect and high tailing discharging loss & Solutions

  • Large flotation foam and reflective surface & Solutions

  • Excessive flotation tank level & Solutions

  • Large amount of pulp scraped and thin foam layer & Solutions

  • Falling pulp level  & Solutions

  • Overswelling and stacked slurry & Solutions

  • Too coarse overflow fineness & Solutions

Let's dive in now!

1. Poor flotation effect and high tailing discharging loss & Solutions

This situation is owing to the substandard grinding fineness of material in the flotation machine or the dosage problem of flotation reagent. If the grinding fineness is not up to the target, the grinding fineness should be appropriately increased, which can increase the number of grinding stages or stage grinding.

If the problem of flotation reagent dosage arises, the flotation reagent should be tested and the dosage and index of flotation reagent should be redetermined. For example, a copper and cobalt oxide mine in Congo,the main copper content is malachite, and the cobalt mineral is hydrocobalt. In order to improve the froth flotation method effect, the sodium thiohydride and ammonia sulfide was used to improve the effect of froth flotation method in a 1:1 ratio.

2. Large flotation foam and reflective surface & Solutions

When the flotation tank appears larger foam, and the foam has the reflective surface, the possible reason is that the flotation reagent is added too much. 

At this time, the flotation plant operator should adjust the flotation reagent dosage appropriately, and observe whether the flotation foam condition is improved.

3. Excessive flotation tank level & Solutions

The fault may be caused by the blockage of the suction tube. 

At this time, the flotation operator should stop the suction tube and clean it.

4. Large amount of pulp scraped and thin foam layer & Solutions

There are four possible reasons for this situation, one is the overflow concentration is too dilute, two is the position of the liquid level adjustment plate is too high, three is the slurry overflow concentration is too thick, which may also lead to coarse size and serious sand sinking, four is the dosage of inhibitor and regulator is too large, resulting in the failure to produce appropriate amount of foam. 

When this happens, the flotation operator should first observe the situation, control the pulp concentration and fineness, and pay attention to control the dosage of regulator and inhibitor to get the better index of froth flotation method.

5. Falling pulp level  & Solutions

The possible reasons for the falling of slurry level include the grinding fineness is too thick, the processing capacity is increased, or the reagent dosage is insufficient. 

The flotation operator can adjust the grinding and classifying, reduce the amount of ore feeding, or adjust the reagent dosage.

6. Overswelling and stacked slurry & Solutions

Generally, this problem of froth flotation method has the following reasons: the ore feeding is too much, the inflating volume is too much, the middle box and the liquid level adjustment plate is blocked, the suction capacity of suction tank is insufficient, the pressure of flushing water is too small. In these cases, the blockage of liquid level adjustment plate is the most likely to cause sand setting, the flotation operator can minimize level adjustment plate, dredge clogs, open the bottom valve if necessary, to make the slurry flow and check whether the pipe is blocked. 

At the same time, the flotation operator should know the amount of ore feeding and overflow concentration, timely find out the reason, and adjust to ore feeding according to reasons. 

7. Too coarse overflow fineness & Solutions

When this phenomenon occurs, the flotation operator should first stop the ore feeding, then open the bottom flow valve at the bottom of the tank, and then start the ore feeding and block the bottom flow valve when the slurry flow returns normal. 

At the same time, pay attention to control the slurry concentration.


The above are 7 common problems and their solutions in the froth flotation method. For the small and medium mineral processing plant, it is suggested to choose the turn-key mineral processing solution provider from the ore dressing experiment to the mine operation, so that the above problems can be solved effectively, the flotation operator can also be effectively guided, which reduces problems in subsequent froth flotation method.

If you have any question or want to know more about flotation process, please contact us.


Last: 5 Flotation Processes Used to the Extraction of Lead-Zinc Sulfide Ores

Next: Cyanidation Machinery Used in the Gold Leaching


Please leave your message here! We will send detail technical info and quotation to you!

  • *
  • *
  • *
  • *
  • *
  • *
  • *
  • *
  • *