Method for eliminating shutdown scale in cold-rolling pickling process section

Abstract

The invention provides a method for eliminating shutdown scale in a cold-rolling pickling process section. The method comprises the following steps that a combined inching switch of the pickling process section is additionally arranged in an operation table; the section, where the scale is generated, of strip steel in a flushing tank of the cold-rolling pickling process section is completely retreated into a pickling tank, and the section of the strip steel is pickled again; a reverse flushing system is additionally arranged in front of the pickling tank of the cold-rolling pickling process section, and the section of the strip steel pickled again by the pickling tank undergoes squeeze-drying, blowing, flushing, secondary blowing and secondary squeeze-drying in sequence in the reverse flushing system and then enters an inlet loop of the cold-rolling pickling process section; normal shutdown limit and emergency shutdown limit are adjusted when the inlet loop is filled; and normal shutdown limit is adjusted when an outlet loop is empty. According to the method, the shutdown scale is eliminated, the annual averaged economic loss is reduced, the operation is convenient, and hydrochloric acid and desalted water are not wasted.

Description

Technical field [0001] The invention relates to the field of cold-rolling pickling, in particular to a method for eliminating stoppage rust in a cold-rolling pickling process section. Background technique [0002] The production of cold-rolled steel strip uses hot-rolled steel as raw materials. The surface of the hot-rolled steel is black and dark because of the high temperature of hot rolling. The surface of the cold-rolled steel is bright and silver because of the pickling treatment before cold rolling. During the production process, the strip is in the pickling process figure 1 The direction of the arrow shown goes forward and goes through pickling, washing, purging and drying in turn. The pickling is to use the principle of iron oxide and hydrochloric acid to produce ferric chloride and water to remove the iron oxide scale on the surface of the strip; washing is to use desalinated water Rinse the upper and lower surfaces of the strip to remove the acid residue on the surface ...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for eliminating water rust in the cold-rolled pickling process section, which solves the problem of water rust caused by parking in the cold-rolled pickling process section

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