Deep filtration method of emulsion used by cold-rolling unit

Abstract

The invention discloses a deep filtration method of an emulsion used by a cold-rolling unit. The deep filtration method comprises the following steps of pumping an emulsion used by a cold-rolling unit into a flat plate filter, removing sticky impurities in the emulsion by the flat plate filter, feeding the emulsion without the sticky impurities into an emulsion tank, carrying out overflow filtration of the emulsion in the emulsion tank so that impurities floating on the surface of the emulsion enter into an overflow tank, feeding the emulsion in the overflow tank into a magnetic induction filter and a permanent magnet-type filter, carrying out further filtration so that iron-containing impurities in the emulsion are removed, feeding back the emulsion filtered by the magnetic induction filter and the permanent magnet-type filter into the emulsion tank, feeding the emulsion in the emulsion tank into a cold-rolling machine, wherein a backwash filter is arranged in a passage for conveying the emulsion to the cold-rolling machine, and filtering the emulsion by the backwash filter to remove particles before the emulsion enters into the cold-rolling machine.

Description

technical field [0001] The invention relates to a method for filtering mixed liquid, in particular to a method for filtering emulsion. Background technique [0002] Cold-rolled strip needs to use emulsion for process lubrication during the rolling process. During the plastic deformation process, the strip steel and the roll will produce fine iron powder under the friction force, enter the emulsion system, and form oil sludge and iron soap. These two impurities will block the relevant pipelines of the emulsion system, resulting in production failure or product surface quality defects. [0003] At present, for the filtration of cold rolling mill emulsion, equipment such as flat filter (FBF) and automatic backwash filter (NWF) are generally used. The flat filter uses filter cloth to filter impurities in the emulsion, and the backwash filter It is to filter impurities through the attached filter element. Although the above two filtration methods can remove impurities in the e...

AI Technical Summary

Problems solved by technology

Although the above two filtration methods can remove impurities in the emulsion to a certain extent, their shortcomings are also obvious, that is, the filtration accuracy and filtration capacity are very limited, especially for impurities such as iron powder in the emulsion. filter effect

In addition, when rolling steel with high hardness (such as silicon steel and high-strength steel), the emulsion will contain more oil sludge and iron soap, which is difficult to completely remove with a single filtration method

Images