The WBRM process allows to to obtain reinforcing glass fibres with characteristics similar to the E glass fibers, used actually in the production of fabrics, geotextiles, plastic material, bituminous sheaths.
These fibers are obtained with the melting in special plants of specific mixtures of wastes constituted by:
- fly and bottom ashes from wastes thermal treatment;
- coal combustion ashes;
- waste foundry sand.
This process is particularly suitable for the treatment of incineration fly ashes that contain important concentration of heavy metals, of anionic salts and polluting organic elements (dioxin, furans) that are very difficult to be recovered with other recycling processes.
Form the WBRM process, in addition to the glass fibers, also salty slag without heavy metals are obtained, usable as deicing salts.
The process is very interesting both from the technical point of view and from the economical one because the power consumption is even inferior to the ones related to the production of traditional E glass fibers, moreover using wastes it's possible to limit considerably the need of precious raw material.
The fibers obtained with this process shown a better chemical stability then the traditional E glass and could be used also in the field of concrete and bituminous conglomerates.
This process must be preferably integrated in the structure of a traditional waste incinerator, thus will allow to reduce nearly totally the solid toxic waste production in this activity.