What inlet temperature and final moisture apply to alumina drying?

Inlet air is typically around 250–300°C and the material can be dried to under 1% final moisture, while the short residence time keeps the material itself from overheating.

How is flame-retardant ATH handled in a flash dryer?

Because flame-retardant aluminium hydroxide is ultrafine, the bag filter is run at a low air velocity (under about 1 m/s) to prevent the fine material being carried over with the exhaust.

Flash Dryer for Aluminium Hydroxide & Alumina: Drying to <1% Moisture

How a spin flash dryer dries aluminium hydroxide and alumina from a >50% wet cake to under 1% moisture, including flame-retardant ATH grades that need low filter-velocity handling.

Aluminium hydroxide (ATH) and alumina are used as flame retardants, in ceramics and abrasives, and in the light-metals industry. They are filtered as a high-moisture cake — often over 50% moisture — and conventional box, belt or drum drying is slow, energy-hungry and needs a separate crushing and sieving step. A spin flash dryer dries the cake in seconds to under 1% moisture, with drying, disintegration and classification in one closed machine.

The drying challenge

Very wet cake — over 50% moisture off the filter press, too thick to pump.
Surface sintering and discolouration risk — high temperature can sinter the material or precipitate crystal water, so parameters must be controlled.
Flame-retardant ATH is ultrafine and must not be carried over — filter air velocity has to be kept low.
Low final moisture required (under 1%).

Why a spin flash dryer fits

Dries to under 1% moisture in a single step from a >50%-moisture cake, with inlet air typically around 250–300°C and the material itself staying cool.
Controlled parameters avoid surface sintering, crystal-water precipitation and discolouration.
Handles ultrafine flame-retardant ATH — the bag filter is run at a low air velocity (under ~1 m/s) to stop fine material being carried over.
One closed machine does drying, disintegration and classification, cutting dust and energy versus box or drum drying.

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 aluminium hydroxide 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.

Frequently Asked Questions

Yes. A spin flash dryer dries a high-moisture aluminium hydroxide cake (over 50% moisture) to under 1% in seconds, with controlled parameters to avoid sintering or discolouration.