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Process for recovering aluminum ions and sulfuric acid from aluminum alloy anodic oxidation tank

An anodizing tank, aluminum ion technology, applied in the direction of anodizing, process efficiency improvement, cells, etc., can solve the problems of lye consumption, increase processing cost, waste aluminum resources, etc., to reduce tank liquid resistance and optimize oxide film. effect of structure

Active Publication Date: 2014-07-09
FOSHAN SANSHUI XIONGYING INNOVATION CENT FOR ALUMINUM SURFACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One is to discharge it directly into the wastewater treatment center, which not only increases the treatment cost, but also wastes aluminum resources; the other is to ask a professional treatment factory to pull it away
If these treatment plants treat a large amount of oxidized waste acid individually, they will consume a large amount of lye, and the society will pay expensive treatment costs for this.

Method used

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  • Process for recovering aluminum ions and sulfuric acid from aluminum alloy anodic oxidation tank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Take anodizing solution: free sulfuric acid 281.8g / L, Al 3+ 21.54g / L, temperature 20°C, experiment according to Table 1, after 20 minutes of crystallization, detect aluminum ions in time.

[0057] Table 1

[0058] Oxidation solution (ml)

1000

1000

1000

1000

1000

1000

1000

1000

Ammonium sulfate (g)

10

20

30

40

50

60

70

80

Al 3+ (g / L)

19.54

16.45

13.64

11.14

9.25

7.78

7.32

6.85

[0059] Take anodizing solution: free sulfuric acid 281.8g / L, Al 3+ 21.54g / L, temperature 20°C, experiment according to Table 2, after 24 hours of crystallization, detect aluminum ions in time.

[0060] Table 2

[0061] Oxidation solution (ml)

1000

1000

1000

1000

1000

1000

1000

1000

Ammonium sulfate (g)

10

20

30

40

50

60

70

80

Al 3+ (g / L)

18.94

16.05

13.14

10.64

...

Embodiment 2

[0077] The present invention is designed according to the annual output of 100,000 tons of alumina profiles, and produces about 20,000 tons of oxidation waste liquid and about 400 tons of dissolved aluminum. In order to achieve the goal of treating 20,000 tons of oxidized waste liquid, a 40M 3 Oxidation waste liquid reaction tank, 40M 3 Oxidation solution collection tank and a belt filter press, as well as matching pipelines, pumps and valves.

[0078] combined with figure 1 , the concrete operating procedure of process device of the present invention is as follows:

[0079] A. Close No. 3 valve 203, open No. 1 valve 201, No. 2 valve 202 and No. 4 valve 204, and start No. 1 pump 11 and refrigerator 2, the oxidation tank 1 starts to cool down, and the oxidation line starts production;

[0080] B. Open the No. 3 valve 203, close the No. 2 valve 202, the oxidizing liquid in the oxidation tank is introduced into the reaction tank 4, then close the No. 3 valve, open the No. 2 va...

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Abstract

The invention aims at the chemical engineering field, relates to a treatment process of an aluminum alloy anodic oxidation waste liquid and specifically relates to a process for recovering aluminum ions and sulfuric acid from an aluminum alloy anodic oxidation tank. The process comprises a step of circularly cooling an oxidation liquid, a step of crystalizing aluminum ions and recovering side-products, a step of recovering a sulfuric acid oxidization liquid, a step of air agitation and a step of defrosting an exchanger. The invention provides a brand-new treatment process which is capable of completely recovering the aluminum ions in the anodic oxidation waste liquid by virtue of crystallization treatment and realizing circulating utilization of a crystallization mother liquor, and therefore, the treatment process can be used for realizing turning waste into wealth and changing from passive to active; in addition, the aluminum ion concentration working range of the oxidation tank liquid is reduced to the optimal range of 3-10g / L from 10-20g / L for the first time, and therefore, the structure of an aluminum alloy oxide film is optimized, the resistance of the tank liquid is reduced and oxidization energy conservation is realized. The process is a comprehensive circulating process which is reasonable in design, and consequently, the production cost of an aluminum processing enterprise is reduced and remarkable economic benefit can be achieved.

Description

technical field [0001] The invention aims at the field of chemical industry, and relates to a processing technology for processing waste liquid of aluminum products, in particular to a processing technology for aluminum alloy anodic oxidation waste liquid. Background technique [0002] Aluminum is currently the largest and most widely used non-ferrous metal in the world. Aluminum and its products have been widely used in construction, aerospace, transportation, mechanical equipment, electronic equipment, packaging materials, electric power and daily necessities and other industries. Aluminum is an indispensable and important basic raw material for national economic construction, strategic emerging industries and the development of national defense science and technology industry. In the past decade, the global aluminum industry has shown a continuous development trend, and the demand for aluminum products has increased year by year. In 2011, the global primary aluminum outpu...

Claims

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Application Information

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IPC IPC(8): C25D21/18C25D11/04C22B7/00C22B21/00
CPCY02P10/20
Inventor 熊晨凯
Owner FOSHAN SANSHUI XIONGYING INNOVATION CENT FOR ALUMINUM SURFACE TECH
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