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Leca is initial letters for : Light Expanded Clay Aggregate.
Leca consists of small, lightweight, bloated particles of burnt clay.The thousands of small, air-filled cavities give Leca its strength and thermal insulation properties.
The base material is plastic clay which is extensively pretreated and then heated and expanded in a rotary kiln. Finally, the product is burned at 1100 °C to form the finished Leca product.
Materials used for produce LECA:
But for clay and fly ash, need to pelletilized in to solid, and than calcination in kiln.
Dajia Roller Press Machinery much better for the production line.
This machine is simple and saving much manpower for pelleting.
Final pellet size: 10-15mm
After calcination: 15-30mm
Lightweight pebbles allows it to absorb 40% of its weight in water and also allows for efficient evaporation to help maintain a constant humidity level.
LECA is a chemically-inert medium with a neutral pH, and is reusable, clean, and odorless.