Method for recycling water resulting from a method for producing a mat of mineral fibres

A method for reducing the corrosion of equipment during production of a mineral fiber mat, said method comprising:

• fiberizing fibers and then bonding them with the aid of an aqueous binder comprising at least one sugar selected from hydrogenated sugars, reducing sugars, and non-reducing sugars, and at least one monomeric polycarboxylic acid or salt thereof in a forming zone;
• cross-linking the aqueous binder in an oven;
• and
• washing the equipment in the forming zone with wash water that is continuously recycled in a first recycling loop and whose pH is adjusted to a value between 6 and 9 before being recycled to said forming zone along said first recycling loop,
• the method further comprising washing fumes from the oven with water and recycling the fumes' wash water;
• in a second recycling loop, separate from the first, a portion of the recycled fumes' wash water being transferred at intervals to a zone for preparing said aqueous binder, without adjusting its pH.