Acid pickling tank for metal strips

摘要

The invention relates to an acid pickling tank for metal strips with a width equal to or greater than 0.50 meter. The tank incorporates an external supporting structure (1) and a metal casing (3) coating internally with rubber (6). The rubber layer (6) is lined internally with large slabs (10a, 10b) of a natural rock of volcanic origin, which has a total SiO2 and Al2O3 content greater than 60%, a porosity of between 6 and 30% and a relative density of less than 3. At most three slabs (10b) are placed side by side along the width of the tank and at most one slab (10a) is placed along its height. The minimum dimensions of a slab (10a or 10b) are 0.50x0.50 meter. The invention is applicable in particular to the pickling of strips of hot-rolled metal sheets.