Jet mill (fluidized bed opposed jet mill) is widely used for talc ultra-fine pulverization. Unlike ball mills, jet mills cannot accept coarse rock directly. Talc must be pre-ground into fine powder before entering the jet mill.
Standard feed size range
For most industrial fluidized bed jet mills for talc:
- Recommended feed size: 60 mesh ~ 200 mesh (74 μm ~ 250 μm)
- Ideal feed: 100 mesh ~ 150 mesh (100–150 μm)
- Maximum allowable top size: ≤ 2 mm (only for large industrial jet mill models; small jet mills require <1 mm)
If feed particles are too coarse, the compressed air jet cannot accelerate them sufficiently, grinding efficiency drops sharply, capacity falls, and oversized particles may block the feed injector and wear ceramic liners. Too many ultra-fine feed fines cause agglomeration, reduce classification precision and waste compressed air.
Typical full process flow
Raw talc ore → jaw & impact crushing → pre-grinding (ball mill or impact mill) → magnetic separation → screening → jet mill feed (60–200 mesh) → jet milling + internal classification → finished ultra-fine talc powder.
Key operational notes for talc jet mill feeding
- Keep feed moisture low. Wet talc agglomerates and blocks feeding and jet mill chamber.
- Complete primary magnetic separation before jet milling to remove iron-bearing gangue, protecting the ceramic lining and maintaining low iron / high whiteness.
- Stable feed size distribution ensures consistent product fineness, narrow PSD and stable production output.
- For high-end cosmetic or coating-grade talc, use tighter feed control (100–200 mesh) to get better lamellar talc morphology.
The standard feed size for a talc fluidized bed jet mill is 60–200 mesh, with the optimal feed at 100–150 mesh. Pre-crushing and pre-grinding are mandatory to prepare talc powder to this particle range before jet milling.
