PROCEDE DE SEPARATION DES COMPOSES DE SILICIUM CONTENUS DANS UN BAIN DE DECAPAGE CHLORHYDRIQUE DE PIECES NOTAMMENT DES TOLES D'ACIER.

摘要

This process in which the used bath is recycled after concentration at (1) by elimination of water at (2), followed by a treatment for recovering iron oxides at (10), is characterized in that it comprises carrying out a tangential microfiltration at (5) of the concentrated bath so as to separate therefrom the silicon compounds in the non-ionic form and thereby concentrate them, and recirculating the major part of the fraction of this bath (11-17) containing these concentrated silicon compounds so as to promote the precipitation of the non-ionic compounds of the silicon.