Light Expanded Clay Aggregate

Lightweight expanded clay aggregate (LECA)

Lightweight expanded clay aggregate (LECA) or expanded clay (exclay)  has an approximately round or potato shape due to circular movement in the kiln, and is available in different sizes and densities. LECA possess the character of lightweight, high strength, low water absorption, thermal insulation, frost resisting，anti-corrosion,etc. LECA is widely used in the field of roof slope, heat insulation concrete, waste water treatment, landscaping and soilless culture, etc.

Brief introduction of LECA production line

LECA (Light Expanded Clay Aggregate) is also called ceramisite, is a kind of ceramic particle product with high fracturing intensity, belonging to Light Weight Aggregate family. LECA has excellent properties, such as low density, high cylinder pressure, internal porosity, good frost resistance, shape and composition more homogeneous, and has a certain strength and robustness, which has light weight, shock resistance and good isolation features (Such as: heat insulation, sound insulation, moisture isolation) etc.

The LECA is widely used in building materials, gardening, refractory insulation materials, Chemical, oil, and other departments. The raw material for production of LECA has no special requirement, almost can be seen everywhere, such as: clay, shale, fly ash, aluminum barium soil, slate, coal gangue, sludge and even industrial solid wastes, etc. According to local fuel supply, using the coal, crude oil, natural gas or rice husk, etc.

The pellets are rounded in shape and fall from the kiln in a grade of approximately Template:Nowrap with an average dry bulk density of approximately 350 kg/m³. The material is sieved into a number of different grades to suit the application.
With the advantage of light weight, high permeability, high durability and excellent sound and thermal insulating properties, expanded clay is a good 'all round' aggregate for use in an a variety of applications. It is also an environmentally friendly product composed mostly of naturally occurring clay, is not susceptible to chemical attack, rot or frost and has a long life span. The lightweight nature of the expanded clay pellet make it an ideal solution when constructing over weak soil deposits or reducing the load behind old and susceptible structure. The air pockets within the pellet provide excellent thermal resistance when used as underfloor insulation within solid floor construction. The expanded clay pellets are also used extensively for the manufacture of Lightweight blocks and frequently used in water filtration systems due to their high surface area.

Production process of LECA Plant

1)Crushing ---- 2)Batching---- 3)Granulating and Sieving ---- 4)Calcining and Cooling ---- 5)Final Product Sieving

1) Crushing and Feeding
 Crush the big size materials to the suitable size. 
 Common Crusher include: Jaw Crusher, Hammer Crusher, Cone Crusher.

2) Batching and Mixing
 After crushing, different materials should be mixed.

3) Granulating and Sieving
 Granulating by granulator.
 Before calcining, the unqualified balls are screened out by the rotary drum screen, then return back to the crusher to crush again, then secondary granulating.

4) Calcining and Cooling
 Calcining the semi-product (wet ceramisite balls) by Rotary Kiln.
 For the calcined balls' temperature is too high, need to cool by cooler. Then get the final product.

5) Final Product Sieving and Conveying
 Sieving the final product according to its granularity.