TH21674A - Aluminum immersion process - Google Patents

Abstract

Process according to the purpose of this invention It is the treatment of a used rinsing solution containing highly concentrated sodium hydroxide in the range of 160 to 400 g / l with the first dilution. As required, a medium with a sodium hydroxide concentration in the range of 150 to 250 g / l is obtained with the diluted water heated, the used etching solution. Or alkaline solution that Rebuilt Or a combination of the heated dilution and the spent etching solution or the newly formed alkali solution. By using this, the ratio is compared. Times that of aluminum / sodium hydroxide As criteria Select the dilution medium Stabilize the solution, so purification and solid-liquid separation can be achieved. As required Removal of impurities that adversely affect Soaking efficiency With little loss occurring at Most of the useful substances of sodium hydroxide and aluminum. Contained in used equipment rinsing solution Recovery of aluminum contained in used equipment wash solution in the form of aluminum hydroxide. In the crystalline quality (gibs) and the use of sodium hydroxide in the form of Added to compensate for the sodium hydroxide used for etching infusions.

Claims (1)

1.In the process for immersion aluminum material is treated with aluminum material treatment. That is composed of aluminum or alloys of aluminum With an etching solution consisting of a liquid sodium hydroxide solution aqueous degradation of the used solution after etching, in which crystalline aluminum hydroxide granules are present. For recovery of crystalline aluminum hydroxide and regenerated alkaline solutions. From the used etch solution and recycling of the newly created alkali solution in the tag hole: