Stabilization and regeneration method of aluminum and aluminum alloy chemical milling solution

An aluminum alloy and milling fluid technology, applied in the field of aluminum removal, can solve the problem of not forming a recycling method, and achieve the effects of reducing pollution, prolonging service life, and preventing environmental pollution

Inactive Publication Date: 2010-12-01
CHENGDU AIRCRAFT INDUSTRY GROUP
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Problems solved by technology

[0007] When the chemical milling fluid fails, a very effective recycling method has not been formed at present. It is only transported to the chemical treatment dump (the invalid chemical milling fluid is a hazardous waste) for processing, which brings greater economic and economic benefits to the enterprise. Environmental pressure

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  • Stabilization and regeneration method of aluminum and aluminum alloy chemical milling solution

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Embodiment Construction

[0015] Process the chemical milling fluid according to the following steps:

[0016] 1. Pretreatment:

[0017] (1) Take out part (accounting for about 10% of the volume of the chemical milling groove) of chemical milling fluid at 98°C from the chemical milling groove and place it in the storage tank;

[0018] (2) Filtration at 90°C to 98°C;

[0019] (3) When the aluminum ion concentration in the filtered solution is less than 55g / L, return to the chemical milling tank;

[0020] (4) when the aluminum ion concentration in the filtered solution is greater than 55g / L, import the reactor;

[0021] 2. Response:

[0022] Add deionized water to the reactor to dilute the chemical milling solution. The amount of water added is 0.5 to 2 times the volume of the chemical milling solution. The temperature is controlled at 40°C to 60°C, and the concentration of sodium hydroxide is controlled at 60 to 110g / L.

[0023] 3. Crystallization - separation:

[0024] (1) Add aluminum hydroxide s...

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Abstract

The invention provides a stabilization and regeneration method of aluminum and aluminum alloy chemical milling solution, which can realize the cycle use of the aluminum alloy chemical milling solution, improve service life, lower cost and reduce pollution of the aluminum alloy chemical milling solution. The method comprises the following five steps: (1) introducing part of the chemical milling solution into a storage tank, and then removing suspended matters with a common filer; (2) introducing the obtained filtrate into a reactor, adding deionized water and aluminum hydroxide seed crystals to the filtrate, and then evenly mixing to crystallize and precipitate aluminum hydroxide, wherein the volume of the deionized water is 0.5-2 times of that of the filtrate; (3) leading the obtained mixed liquid into a crystallization tank, adding a proper amount of aluminum hydroxide seed crystals to the mixed liquid for crystal growth for 24-48h to separate out aluminum hydroxide crystals, and then leading the obtained supernate into an adjusting tank; (4) adding a proper amount of sodium hydroxide and other components to the adjusting tank to recover chemical milling efficacy of the chemical milling solution; and (5) washing and then drying the aluminum hydroxide crystals to finally obtain the aluminum hydroxide solid product.

Description

technical field [0001] The invention provides a method for removing aluminum from alkali solution, especially a method for stabilizing and regenerating aluminum and aluminum alloy milling fluid. Background technique [0002] Chemical milling is an important aluminum alloy processing method widely used in the aerospace industry. [0003] The chemical reaction formula of aluminum and its alloy milling is as follows: [0004] 2Al+2NaOH+2H 2 O→2NaAlO 2 +3H 2 o [0005] [0006] In the process of aluminum alloy milling, aluminum is dissolved in the milling fluid as NaAlO 2 exists in the form of NaAlO 2 The production of chemical milling fluid will reduce the effectiveness of chemical milling. As the chemical milling progresses, due to the continuous dissolution of metal aluminum, the NaAlO in the milling fluid 2 The concentration increases continuously, when the total Al 3+ When the concentration is greater than 75g / L, the solution will be invalid. [0007] When the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/46
Inventor 周国华尹茂生魏立安
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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