In froth flotation, pH sensors need to work in abrasive slurry, fine solids, oily films, and process reagents. That makes the reference junction one of the most important – and most vulnerable – parts of an electrochemical pH sensor.
A mining symposium paper comparing wood, nanocoated wood, and PTFE junctions in a copper flotation circuit produced a useful engineering lesson. The particular nanocoated configuration tested did not show a long-term performance advantage under the conditions studied. At the same time, the results suggest that hydrophobic and oleophobic surface treatments may still have promise if they are integrated with junction structure and electrolyte management in the right way.
That is an important distinction for plant engineers. The real design question is not simply whether a sensor uses a coating. It is whether the full reference junction system stays fast, stable, and recoverable under real process conditions.
- What The Study Tested
- What Made The Result Interesting
- What The Results Suggest About Junction Design
- Why This Matters For Flotation Operations
Questions:
- Did the nanocoating improve long-term performance in this study?
- Does this mean hydrophobic or oleophobic coatings have no place in pH sensors?
- What should engineers look for in a flotation pH sensor?
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