Allocation and Method of Retrofitting Existing Oxidation Tank to Recover Anodic Oxidation Solution

A technology of anodizing and oxidizing liquid, applied in anodizing, coating, electrolytic components, etc., can solve problems such as increasing equipment investment, and achieve the effect of reducing investment cost, avoiding ash hanging, and reducing floor space

Active Publication Date: 2020-01-14
FOSHAN SANSHUI XIONGYING INNOVATION CENT FOR ALUMINUM SURFACE TECH
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Problems solved by technology

However, the recovery system configuration provided by these invention patents requires the configuration of a large number of reaction tanks, crystallization tanks and solid-liquid separation equipment. In addition to increasing equipment investment, the problem of occupying a large amount of space is more prominent; The volume, compared to the total volume of the oxidizing solution in the aluminum factory, is still too small, and there are often disadvantages of small horses and large carts

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  • Allocation and Method of Retrofitting Existing Oxidation Tank to Recover Anodic Oxidation Solution
  • Allocation and Method of Retrofitting Existing Oxidation Tank to Recover Anodic Oxidation Solution
  • Allocation and Method of Retrofitting Existing Oxidation Tank to Recover Anodic Oxidation Solution

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[0064] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solution of the present invention is described in detail below, but it should not be construed as limiting the scope of implementation of the present invention.

[0065] 1. Theoretical basis for the recovery of aluminum ions and sulfuric acid in the anodizing solution

[0066] When the aluminum alloy is oxidized, according to formula (3), part of the oxide film is dissolved, about 4Kg / T (400m 2 ) of aluminum is dissolved into the sulfuric acid oxidation solution, so that the oxidation solution contains Al 3+ 、H + and SO 4 2- , add ammonium sulfate, ammonium nitrate, ammonium chloride, potassium sulfate, potassium nitrate, potassium chloride to this oxidation solution, then the following reaction occurs:

[0067] Add ammonium sulfate to the oxidizing solution:

[0068] al 2 (SO 4 ) 3 +(NH 4 ) 2 SO 4 +12H 2 O=2NH 4 Al(SO ...

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Abstract

The invention discloses a configuration of improving an existing oxidation tank to recover an anode oxidation solution. An oxidation solution collecting system, an oxidation solution circulation cooling system, an oxidation solution treatment system, an oxidation solution separation system and an oxidation solution recovering and recrystallizing system are included. The invention further disclosesa method for recovering the anode oxidation solution using the configuration of improving the existing oxidation tank to recover the anode oxidation solution. The method comprises the steps of oxidation solution collecting, oxidation solution circularly cooling, oxidation solution processing and separating, and oxidation solution recovery and recrystallizing. By means of the configuration and themethod, online crystal precipitation of aluminum ions and oxidation solution circular use can be achieved to effectively reduce oxidation solution resistance and achieve low-cost high-quality production.

Description

technical field [0001] The invention relates to a configuration and a method for transforming an existing oxidation tank to recycle anodized liquid, and belongs to the field of aluminum processing. Background technique [0002] In the anodic oxidation solution of the oxidation tank, the aluminum alloy with a conductive surface is placed on the anode. Under the action of an external electric field, the process of forming an oxide film on the surface is called anodic oxidation, and the film produced is an anodic oxidation film or an electrochemical conversion film. [0003] Aluminum anodizing solution refers to the bath solution used for anodizing aluminum alloy. When slotting, the concentration of sulfuric acid in the anodic oxidation solution is between 160-200g / L, and there is no aluminum ion in the bath solution, which has a strong ability to dissolve the oxide film. Usually, the anodizing time is 40-60 minutes, the temperature is 18-22°C, and the amount of dissolved alum...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/04C25D21/18
CPCC25D11/005C25D11/04C25D21/18
Inventor 熊映明
Owner FOSHAN SANSHUI XIONGYING INNOVATION CENT FOR ALUMINUM SURFACE TECH
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