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A treatment method for recycling waste acid in anodic oxidation tanks of aluminum profiles

An anodic oxidation tank and treatment method technology, applied in the field of aluminum profile processing, can solve the problems of waste pollution, difficult treatment, high cost, etc., and achieve the effects of avoiding strong environmental pollution, high raw material utilization rate, and simple process

Active Publication Date: 2021-07-30
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the difficulty, high cost, serious waste pollution and existing deficiencies in the existing technology of the current aluminum profile anodic oxidation tank waste acid treatment, the purpose of the present invention is to provide a recycling treatment of aluminum profile anodic oxidation tank waste acid Method, low cost, no pollution, sufficient removal of aluminum ions, recyclable acid, high utilization rate of raw materials, simple process, and mechanization of aluminum profile anodizing tank waste acid recycling treatment

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  • A treatment method for recycling waste acid in anodic oxidation tanks of aluminum profiles

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Embodiment 1

[0039] A treatment method for recycling spent acid in anodic oxidation tanks of aluminum profiles, the steps of which are:

[0040] (1) Heating reaction: The main components are 19% (mass fraction) of sulfuric acid, 1.8% (mass fraction) of aluminum ions, 1.7% (mass fraction) of LY-920 wide temperature oxidant for aluminum profile anodizing and 77.5% (mass fraction) of water Put 500 grams of waste acid in the anodizing tank of aluminum profiles in a grinding-mouth Erlenmeyer flask, add 1.5% dodecylbenzenesulfonic acid by mass under the stirring condition of 100 rpm, turn on the cold water reflux, and heat the mixture to 85 ℃ and maintained at 85 ℃, continue to heat and stir for 8 hours to react the dodecylbenzenesulfonic acid with aluminum ions to form the corresponding aluminum dodecylbenzenesulfonate, and obtain the reaction solution for future use.

[0041] (2) Seed crystal preparation: take solid analytically pure aluminum dodecylbenzenesulfonate, pulverize it with a stainl...

Embodiment 2

[0048] A treatment method for recycling spent acid in anodic oxidation tanks of aluminum profiles, the steps of which are:

[0049] (1) Heating reaction: The main components are 16% (mass fraction) of sulfuric acid, 2.1% (mass fraction) of aluminum ions, 1.3% (mass fraction) of LY-920 wide temperature oxidant for aluminum profile anodizing and 80.6% (mass fraction) of water Put 650 grams of waste acid in the anodizing tank of aluminum profiles into a ground-mouth Erlenmeyer flask, add 2.5% phytic acid by mass under the stirring condition of 130rpm, turn on the cold water reflux, heat the mixture to 90°C and maintain it at 90°C , continue to heat and stir for 9 hours to react the phytic acid and aluminum ions to generate the corresponding aluminum phytate, and obtain the reaction solution for later use.

[0050] ⑵Preparation of crystal seeds: take solid analytically pure aluminum phytate, pulverize it with a stainless steel pulverizer, and pass through a 160-mesh standard sieve...

Embodiment 3

[0057] A treatment method for recycling spent acid in anodic oxidation tanks of aluminum profiles, the steps of which are:

[0058] (1) Heating reaction: The main components are 20.5% (mass fraction) of sulfuric acid, 2.4% (mass fraction) of aluminum ions, 0.7% (mass fraction) of LY-920 wide temperature oxidant for anodizing aluminum profiles and 76.4% (mass fraction) of water Put 832 grams of waste acid in the anodizing tank of aluminum profiles in a ground-mouth Erlenmeyer flask, add oxalic acid with a mass fraction of 3.0% under the stirring condition of a stirring speed of 150 rpm, turn on the cold water reflux, heat the mixture to 80°C and maintain it at 80°C , continue heating and stirring for 12 hours to react the oxalic acid and aluminum ions to generate the corresponding aluminum oxalate, and obtain the reaction solution for later use.

[0059] (2) Preparation of seed crystals: take solid analytically pure aluminum oxalate, pulverize it with a stainless steel pulveriz...

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Abstract

The invention discloses a treatment method for recycling waste acid from anodic oxidation tanks of aluminum profiles. The steps are as follows: (1) Heating reaction: take the waste acid from anodic oxidation tanks of aluminum profiles into a reaction kettle resistant to strong acids, turn on cooling water backflow, and continuously stir, Add the compounding agent, heat the mixture to the reaction temperature and maintain the reaction temperature, and continue to heat and stir; (2) Seed crystal preparation: take the solid aluminum salt composed of the compounding agent acid radical and aluminum ions, which is insoluble in water and dilute sulfuric acid, and pulverize it with a stainless steel pulverizer Sieve; (3) seed crystal induction: use the aluminum salt in the reaction liquid to induce the aluminum salt precipitation by the seed crystal; (4) natural sedimentation: the temperature of the reaction liquid from which the aluminum salt is precipitated is controlled, the stirring speed is controlled, and the stirring is continued, and the sedimentation supernatant is taken . ⑸ Membrane separation: Precisely filter the sedimentation supernatant obtained with microporous membrane equipment to obtain dealuminated solution in anodic oxidation tank of aluminum profiles; ⑹ composition adjustment. Low cost, no pollution, sufficient removal of aluminum ions, recyclable acid, high utilization rate of raw materials, simple process and mechanization.

Description

technical field [0001] The invention belongs to the technical field of aluminum profile processing, and more specifically relates to a treatment method for recycling waste acid in anodic oxidation tanks of aluminum profiles. It is suitable for the recycling treatment of waste acid in aluminum profile anodizing tanks of any formula in the aluminum profile processing industry, and the recycling treatment of waste acid in aluminum profile electrolytic polishing tanks in the aluminum profile processing industry, including sulfuric acid anodizing process, chromic acid anode The waste acid produced by the oxidation process, oxalic acid anodizing process and phosphoric acid anodizing process, as well as the recycling treatment of aluminum-containing waste acid in the aluminum profile processing industry. Background technique [0002] Anodizing is an electrolytic oxidation in which an oxide film composed of aluminum oxide is usually formed on the surface of aluminum profiles. This ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/08C25D11/10C25D21/18C25D21/06
CPCC25D11/08C25D11/10C25D21/06C25D21/18
Inventor 吴正奇吴龙李倩陈小强
Owner HUBEI UNIV OF TECH
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