Flash Dryer for Boric Acid: Gentle Drying Without Dehydration
How a spin flash dryer dries boric acid (H3BO3) gently and fast, removing moisture without dehydrating it to metaboric acid or boron oxide.
Boric acid (H₃BO₃) is used in glass and fibreglass, ceramics and glazes, flame retardants, pharmaceuticals and fertilisers. It is heat-sensitive: held too long at temperature it dehydrates to metaboric acid and then boron oxide. So drying must be fast and at controlled, moderate temperature. A spin flash dryer removes moisture in seconds, before dehydration can occur.
The drying challenge
- Heat-sensitive — prolonged heat dehydrates boric acid to metaboric acid and boron oxide.
- Wet crystalline material that must stay as H₃BO₃.
- Controlled moisture and particle size for downstream use.
Why a spin flash dryer fits
- Fast, low-temperature drying. Seconds of residence and a controlled temperature remove moisture without dehydrating the boric acid.
- Handles the wet material directly with the bottom agitator.
- Controlled fineness from the top classifier.
- Uniform product in a single drying step.
Sizing guide
Size against your water-evaporation rate:
| Throughput tier | Suggested model | Chamber Ø | Water evaporation |
|---|---|---|---|
| Small line | XSG-4 to XSG-6 | 400–600 mm | 58–163 kg/h |
| Mid-scale | XSG-8 to XSG-10 | 800–1,000 mm | 238–430 kg/h |
| Large production | XSG-12 to XSG-16 | 1,200–1,600 mm | 515–1,203 kg/h |
Full figures are on the Spin Flash Dryer page; for the method see the flash dryer selection guide.
Talk to us about your boric acid drying
Tell us your feed moisture, target fineness and throughput, and we'll recommend the right spin flash dryer. Browse the flash dryer range to start.