SYSTEM FOR PICKLING STEEL STRIP WITH MIXTURE OF SULPHURIC AND NITRIC ACID Russian patent published in 2024 - IPC C23G3/02 

FIELD: etching system.

SUBSTANCE: invention relates to a system for etching strip steel with a mixture of sulphuric and nitric acids. The system contains multi-stage tanks for washing and cleaning, tanks for pickling with the mentioned acid mixture and a hot air dryer for drying the strip steel after cleaning. The system contains a circulation tank of a multi-stage washing and cleaning system for receiving cleaning liquid coming out of the multi-stage tank for washing and cleaning, circulation tanks of a mixture of acids for receiving cleaning liquid released from tanks for pickling with a mixture of acids. The system also includes an acid mixture purification device used to purify the cleaning liquid exiting the multi-stage rinsing and cleaning tank and the acid mixture pickling tank.

EFFECT: invention makes it possible to avoid the accumulation of pickling sludge and to obtain clean strip steel, which allows the strip steel to be used more quickly for the next operation, while ensuring the reuse of the cleaning liquid, as well as each medium used separately.

8 cl, 1 dwg