Circulating purification device for acid for surface treatment

Abstract

The invention relates to a circulating purification device for acid for surface treatment, which is applied to an anode surface treatment production line and can effectively filter sludge in acid liquor. Three acid storage chambers are adopted and are respectively a pre-filtration acid storage chamber, a rough filtration acid storage chamber and an acid purification chamber. Two groups of filtration assemblies are adopted and are respectively a rough filtration assembly arranged between the pre-filtration acid storage chamber and the rough filtration acid storage chamber and a fine filtration assembly arranged between the rough filtration acid storage chamber and the acid purification chamber. The pre-filtration acid storage chamber and the rough filtration acid storage chamber are respectively provided with a rough-filtration slag scraping assembly and a fine-filtration slag scraping assembly which can remove metal flocculate and / or oxide skin accumulated on a rough filtration screen and a fine filtration screen, and the two stages of slag scraping assemblies are connected with a driving device outside a shell through magnetic coupling transmission assemblies arranged in different spaces. The filter screens can be thoroughly cleaned, a filter element does not need to be manually replaced, and the filtering efficiency is greatly improved. The device is reasonable in structure and simple to operate, and realizes automatic filtration of metal ion floccules in acid liquor.

Description

technical field [0001] The invention relates to a device for filtering strong acid, in particular to a device for purifying strong acid used in anode surface treatment. Background technique [0002] The metal surface treatment industry usually uses a large amount of strong acid (hydrochloric acid, sulfuric acid, nitric acid, etc.) to pickle and passivate the metal surface. On the one hand, it is necessary to remove the oxide film or rust products on the surface of the parts to ensure the bonding force and surface quality of the electroplating layer; To improve the corrosion resistance of metal parts. In addition, acid treatment of metal parts can also prevent product pollution and achieve aesthetic effects. [0003] However, with the process of acid treatment, the metal oxides continue to dissolve and enter the acid solution, the hydrogen ions in the original acid solution are gradually replaced by metal ions, the acid concentration gradually decreases, and the metal salt ...

AI Technical Summary

Problems solved by technology

[0006] However, due to the small amount of flocculated metal ion floc sludge in the pickling solution, the specific gravity of some metal ion flocs is close to that of the pickling solution. Although it can be considered to filter it with a filter containing a filter screen and a filter cloth, there are some The following issues make it difficult to achieve better results:

[0007] 1. Metal ion flocs have a high viscosity. After a certain period of work, the meshes of the filter screen and filter cloth are clogged, and the filter cloth of the filter screen must be cleaned. It is necessary to manually disassemble the filter to replace the filter cloth, which is time-consuming and laborious.

[0008] 2. The pickling solution is mostly strong acid and highly corrosive, which brings safety risks to manual cleaning of filter screens and filter cloths

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