Acid pickling tank for metal strips
US4604157A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1985 |
| Grant date | Aug 5, 1986 |
| Priority date | — |
| Expiry date | May 15, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
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 SiO.sub.2 and Al.sub.2 O.sub.3 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 0.50.times.0.50 meter. The invention is applicable in particular to the pickling of strips of hot-rolled metal sheets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.