⚙️ Technological Process

Grinding and Milling Process

Grinding is the preparation of raw material for pelleting, extrusion or mixing — reducing coarse fractions to a fine, homogeneous powder or granulate of the required particle size.

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⚙️
500–15.000 kg/h Grinding capacity
0,5–10 mm Particle Size output
≥ 95% Fraction sieving
Zamenljive Screens / sieves
Process overview

Why is grinding necessary?

Raw material for pelleting must be fine and homogeneous — particles larger than 6 mm compact poorly in the die and cause uneven pellets, breakage and shorter die life. The mill is therefore always the first step in a pelleting line.

For animal feed and extrusion, grinding determines the density, digestibility and homogeneity of the final granulate. Fine fraction (0.5–2 mm) is ideal for small fish and young animals.

1

Raw material infeed

Raw material enters the mill by gravity or screw feeder

2

Impact / crushing

Hammers or teeth grind the raw material by impact and friction against plates

3

Sieving through screen

Only particles smaller than the screen opening pass through

4

Transport to the next process

Ground fraction goes to the mixer, dryer or directly to the pellet press

🔑 Key advantages of grinding

  • Prerequisite for quality pelleting — fine fraction ≤6 mm
  • Increases specific surface area — faster and more uniform drying
  • Homogeneous mixture — better quality animal feed and pellets
  • Replaceable screens for precise fraction adjustment
  • Hammer mill can grind almost all grains, soy, sunflower
  • Crusher for coarse fractions — wood residues, large granulate
  • Flexible: same mill for biomass and animal feed
Particle size for pellet mill
≤ 6 mm
Size for extruder
0,5–2 mm
Raw Material Moisture
≤ 15 %
Rotor speed
2.800–3.600 rpm
Application

What is ground and crushed?

Grinding is a universal process — applied in biomass processing, animal feed, grain and industrial waste.

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Grains and legumes
Corn, barley, wheat, soy are ground into flour for animal feed, extrusion and fermentation.
Corn Barley Soy
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Wood biomass
The crusher reduces wood pieces, branches and chips to a ≤50 mm fraction for the dryer or rotary mill.
Branches Wood chips Bark
🔩
Industrial granulate
Old pellets, processing waste and off-spec granulate are re-ground and returned to the process — zero waste.
Pellet regrind Waste Recycling
Equipment

Grinding and crushing machines

AM Tehnolog offers hammer mills, flaking mills and crushers for all types of raw material.

1
Hammer Mill
Impact mill with rotating hammers for grain, animal feed and biomass. Replaceable screens for precise fraction.
500–8.000 kg/h 1–10 mm sito Grains / Biomass
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2
Flaking Mill
Mill with profiled plates and knives for grinding wet and sticky materials that block hammer mills.
200–3.000 kg/h Wet material Fine grinding
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3
Crusher CM-150
Coarse crusher for wood residues, branches and large agro-waste. Prepares raw material for the mill or directly for the dryer.
1.000–15.000 kg/h Inlet up to 300 mm Wood / Agro
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Technical details

Key parameters of the grinding process

📏
Screen size (mesh)
0,5–10 mm
For fish pellet extrusion: 0.5–1 mm. For biomass pelleting: 4–6 mm. For animal feed: 2–4 mm.
💧
Raw Material Moisture
≤ 15 %
Dry material grinds finer and clogs the screen less. For wet materials use the flaking mill.
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Energy consumption
15–45 kWh/t
Smaller screen openings require more energy. Maize: 20 kWh/t. Biomass: 30–45 kWh/t.
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Rotor speed
2.800–3.600 rpm
Higher speed = finer fraction but higher consumption. Standard 3,000 rpm for grain.
🏋️
Hammer weight
80–250 g
Heavier hammers for harder raw materials (maize, soy). Lighter for softer materials and fine fractions.
⏱️
Hammer replacement
500–2.000 h
Hammer life depends on raw material hardness. AM Tehnolog supplies spare hammers and screens.

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