Pre-pickling acid liquor circulation system and method for hot-rolled stainless steel strip steel

Abstract

The invention discloses a pre-pickling acid liquor circulation system and a pre-pickling acid liquor circulation method for hot-rolled stainless steel strip steel. The system comprises an acid mixing pickling circulation tank, a sulfuric acid pickling circulation tank, a heat exchange device, and a pickling bath; an outlet of the acid mixing pickling circulation tank and an outlet of the sulfuric acid pickling circulation tank are connected with a liquor inlet of an acid liquor circulation pump; a liquor discharge port of the acid liquor circulation pump is connected with an inlet of the heat exchange device; an outlet of the heat exchange device is connected with an inlet of the acid mixing pickling circulation tank, an inlet of the sulfuric acid pickling circulation tank, and an acid inlet of the pickling bath; and an acid discharge port of the pickling bath is connected with the inlet of the acid mixing pickling circulation tank and the inlet of the sulfuric acid pickling circulation tank. The circulation system is simple and practical; and by the circulation system, investment cost is reduced, the pickling parameters can be controlled continuously, the forming amount of sludge in a solution can be reduced, and the pickling effect can be improved.

Description

technical field [0001] The invention relates to the field of hot-rolled stainless steel annealing and pickling, in particular to a hot-rolled stainless steel strip pre-pickle acid circulation system and method. Background technique [0002] The hot-rolled stainless steel annealing and pickling line is a key process in the cold-rolled stainless steel production process. At present, the pickling section of the hot-rolled stainless steel strip annealing and pickling line is generally composed of a sulfuric acid pre-pickling section and a mixed acid pickling section. For ferritic stainless steel, pickling with mixed acid or sulfuric acid can be used for pickling. When pickling martensitic and ferritic stainless steel, sulfuric acid pickling is used. Generally, austenitic, martensitic and ferritic stainless steel The pre-pickling section is designed separately, and the equipment investment is relatively high. Moreover, during the pickling in the pre-pickling section, the concentr...

AI Technical Summary

Problems solved by technology

[0002] The hot-rolled stainless steel annealing and pickling line is a key process in the cold-rolled stainless steel production process. At present, the pickling section of the hot-rolled stainless steel strip annealing and pickling line is generally composed of a sulfuric acid pre-pickling section and a mixed acid pickling section. For ferritic stainless steel, pickling with mixed acid or sulfuric acid can be used for pickling. When pickling martensitic and ferritic stainless steel, sulfuric acid pickling is used. Generally, austenitic, martensitic and ferritic stainless steel The pre-pickling section is designed separately, and the equipment investment is relatively high. Moreover, during the pickling in the pre-pickling section, the concentration of metal ions in the acid solution is manually detected. Sometimes the concentration of metal ions in the acid solution is different from the target concentration. The deviation is large and cannot be found in time, resulting in a large amount of sludge in the acid solution, which is difficult to control during the pickling process and affects the pickling effect

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