System to re-circulate treatment material in processes of surface treatment and finishing

Abstract

System to re-circulate the treatment material in processes of surface treatment and finishing, which can be employed in association with a pickling and/or acid washing plant (12) or in association with a plant (12) for metal-coating with heat, the plant (12) comprising at least one dip tank (13) containing the treatment material (11), which is caused to circulate advantageously in countercurrent to the material to be treated, which is advantageously strip (14), the treatment material (11) being able to consist of acid baths or molten metal, such as zinc or aluminum, the dip tank (13) comprising a discharge conduit (18) and a feeder conduit (17), the system comprising at least two vessels (16a-16b) which can be hermetically sealed and are of a type resistant to pressure and which are positioned in parallel and associated with the discharge conduit (18) and with the feeder conduit (17), each of the vessels (16a-16b) including an independent inlet closure (20) and an independent outlet closure (19), each of the vessels (16a-16b) being associated, by way of an independent inlet valve (21) for entry of a gaseous fluid, with a plant of gaseous fluid under pressure, and, by way of a bleeder valve (22), with the atmosphere, each of the vessels (16a-16b) having a first filling condition and a second emptying condition.

Dependencies are inferred from the claim text.