Aluminum and aluminum alloy etching clean production process

A clean production and etching technology, applied in the field of industrial wastewater treatment, can solve the problem of not forming a recycling method, and achieve the effects of reducing cost and environmental protection pressure, prolonging life, and improving cleanliness

Inactive Publication Date: 2021-08-20
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] After the etchant fails, there is no very effective recycling method at present. It is only transported to the chemical waste dump (the invalid etchant is hazardous waste) for disposal, which brings economic and environmental pressure to the enterprise

Method used

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  • Aluminum and aluminum alloy etching clean production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Such as figure 1 As shown, aluminum and its alloy etching cleaning production processes include the following steps:

[0033] (1) Cooling dilution:

[0034] From the etch tank 1, the etching groove 1 is extracted from the etching groove 1 to the dielectric etching liquid to the dilution precipitation tank 3, and the inlet port of the heat pump 2 is located below the 1 / 2 liquid surface of the etching groove 1 depth, while pumping The flow rate is mixed from the self-coming water 6, which is mixed into the flow rate of the self-contained water 6 to save the flow rate of the etching liquid, and the amount of tap water 6 and the extracted etching solution are 1: 1 to dilute the precipitated dilution tank 3. The post-etching fluid temperature drops to 40 to 60 ° C.

[0035] (2) Presets of the suspension of the precipitation: After cooling and diluting the etching liquid precipitation for 5 hours, the larger suspension of the particles is removed by the sediment 7.

[...

Embodiment 2

[0039] Example 2: Such as figure 1 As shown, aluminum and its alloy etching cleaning production processes include the following steps:

[0040] (1) Cooling dilution:

[0041] From the etching groove 1, the etching groove 1 is extracted from the etching groove 1 to the dielectric etching fluid to the dilution precipitation tank 3, and the inlet port of the heat pump 2 is located below the 1 / 2 liquid surface of the etching groove 1, and somed The flow rate is mixed from the self-coming water 6, which is mixed into the flow rate of the self-contained water 6 to save the flow rate of the etching liquid, and the amount of tap water 6 and the extracted etching solution are 1: 1 to dilute the precipitated dilution tank 3. The post-etching fluid temperature drops to 40 to 60 ° C.

[0042] (2) Precipitation removal of suspension: After cooling and diluted etching liquid precipitation for 4 hours, the larger suspension of the particles is removed by the sediment 7.

[0043] (3) Filter remov...

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PUM

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Abstract

The invention discloses an aluminum and aluminum alloy etching clean production process. The process comprises the following steps of (1) cooling and diluting, specifically, extracting a high-temperature etching liquid which accounts for 4%-5% of the total amount of the etching liquid in an etching tank from the etching tank by using a heat pump to a dilution precipitation tank, mixing in tap water while extracting, and controlling the volume ratio of the added tap water to the extracted etching liquid to be 1 to 1; (2) removing suspended matters by precipitation, specifically, after precipitating the cooled and diluted etching liquid for 3-5 hours, removing the suspended solids with large particles through sediment; (3) removing suspended matters by filtering, specifically, filtering supernatant liquid in a precipitation dilution tank by using filtering equipment to further remove fine suspended matters in the etching liquid, and separating out filtered filter residues; (4) pumping filtrate filtered in the step (3) back to the etching tank for recycling; and (5) repeating the steps (1)-(4) twice every day. According to the production process, the etching liquid is clean, the service life is prolonged, the etching speed is stable, and the etching quality is improved.

Description

Technical field [0001] The present invention belongs to the technical field of industrial wastewater treatment, and more particularly to an aluminum and alloys etching and cleaning production processes, extending the etching fluid life cycle. Background technique [0002] Etching is an important aluminum alloy processing method widely used in the aerospace industry. [0003] The chemical reaction type when aluminum and its alloy is etched as follows: [0004] 2A1 + 2NAOH + 2H 2 O ➝ 2NAA1O 2 + 3h 2 [0005] Naa1o 2 + H 2 O ⇋ A1 (OH) 3 + Naoh [0006] Metal impurities present in aluminum and alloys, in alkaline conditions and NA 2 In the presence of S, a precipitate is formed. [0007] ME 2+ + 2OH - ➝ME (OH) 2 ↓ [0008] ME 2+ + S 2- ➝mes ↓ [0009] During the aluminum alloy etching, aluminum is dissolved in etching liquid in Naalo 2 The form of Naalo 2 The generation will reduce the efficacy of the etching solution, as the etching is carried out, due to the constant dissolution o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/36C23F1/46
CPCC23F1/36C23F1/46
Inventor 魏喆魏立安周国华陈锦华
Owner NANCHANG HANGKONG UNIVERSITY
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