Groupe CB

From raw materials and in order to obtain the final product, the following operations must take place:

- Remove the clay material (washing),

- Reduce the particle-size(grinding and crushing)

- Sort products according to particle-size distribution (screening) and stock near the facility.

Its first function is to separate the raw material into particle sizes of less than 200 mm (considered dirty, slightly polluted by clay) and particle sizes larger than 200 mm (about 50% of the raw material).

Its second function is to carry out a first crushing to reduce the material to blocks of 0-400 mm (jaw crusher).

The capacity of the primary crusher is 2000 tons/hour.

This facility washes the 0-200 mm material in clear water in two large rotating cylinders (L = 10 m ; D = 3.6 m) in order to recover :

- a fraction 0-200 mm, free of clay, which is then ground and sorted in several steps.

- a filtrate from which the water, the silt and a sand called “lavé” (whose characteristics are valued) are separated.

The sole function is to reduce the particle-size distribution of the preground product (primary output) from 400 mm to 130 mm (in two stages), then to route the products according to their quality:

- either to a third step for chemical processing,
- or to a third step for physical processing.

Designed recently (2004), this facility allows for the production and direct shipment to construction and public work customers of any combination of finished product made from 12 core products produced and stocked in 1000 ton silos.

Its capacity is 800 tons per hour. The loading is automatic over three lines (about 5 mn) and the variety of possible products is unlimited up to a maximum size of 90 mm.