Recycling method for aluminum in aluminum alloy chemical milling waste liquid

A recovery method and aluminum alloy technology, which is applied in the field of recovery and recycling of aluminum alloy alkaline chemical milling waste liquid, can solve the problems of low production efficiency, poor economic benefit, low purity, etc., and achieve small equipment requirements and low production process Short, pure effect

Inactive Publication Date: 2018-09-28
SHENYANG AEROSPACE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method process of reclaiming aluminum hydroxide is simple, but the prepared Al(OH) 3 Low purity, low production efficiency and poor economic benefits

Method used

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  • Recycling method for aluminum in aluminum alloy chemical milling waste liquid
  • Recycling method for aluminum in aluminum alloy chemical milling waste liquid
  • Recycling method for aluminum in aluminum alloy chemical milling waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for recycling aluminum in aluminum alloy milling waste liquid, specifically comprising the following steps:

[0043] Step 1: Centrifuge the alkaline chemical milling waste liquid to remove the precipitate in the waste liquid;

[0044] Step 2: At normal temperature and pressure, add hydrogen peroxide with a volume fraction of 30% to the waste liquid from which precipitation has been removed, and stir at a reaction temperature of 20° C. at a speed of 300 r / min for 5 minutes to fully react to obtain Reaction mixture; wherein, aluminum alloy milling waste liquid, the concentration of the component that contains is: NaOH: 100g / L; NaAlO 2 : 70g / L; Na 2 S: 20g / L; Triethanolamine: 25g / L; The number of moles of hydrogen peroxide: NaAlO in waste liquid 2 The number of moles = 15:1;

[0045] Step 3:

[0046] (1) The reaction mixture is separated from solid and liquid by vacuum filtration to obtain AlOOH crystal filter cake and filtrate;

[0047] (2) After the AlOOH c...

Embodiment 2

[0050] A method for recycling aluminum in aluminum alloy milling waste liquid, specifically comprising the following steps:

[0051] Step 1: Centrifuge the alkaline chemical milling waste liquid to remove the precipitate in the waste liquid;

[0052] Step 2: At normal temperature and pressure, add hydrogen peroxide with a volume fraction of 30% to the waste liquid from which precipitation has been removed, and stir at a reaction temperature of 20° C. at a speed of 300 r / min for 5 minutes to fully react to obtain Reaction mixture; wherein, aluminum alloy milling waste liquid, the concentration of the component that contains is: NaOH: 100g / L; NaAlO 2 : 70g / L; Na 2 S: 20g / L; Triethanolamine: 25g / L; The number of moles of hydrogen peroxide: NaAlO in waste liquid 2 The number of moles = 20:1;

[0053] Step 3:

[0054] (1) The reaction mixture is separated from solid and liquid by vacuum filtration to obtain AlOOH crystal filter cake and filtrate;

[0055] (2) After the AlOOH c...

Embodiment 3

[0058] A method for recycling aluminum in aluminum alloy milling waste liquid, specifically comprising the following steps:

[0059] Step 1: Centrifuge the alkaline chemical milling waste liquid to remove the precipitate in the waste liquid;

[0060] Step 2: At normal temperature and pressure, add hydrogen peroxide with a volume fraction of 30% to the waste liquid from which precipitation has been removed, and stir at a reaction temperature of 20° C. at a speed of 300 r / min for 5 minutes to fully react to obtain Reaction mixture; wherein, aluminum alloy milling waste liquid, the concentration of the component that contains is: NaOH: 100g / L; NaAlO 2 : 70g / L; Na 2 S: 20g / L; Triethanolamine: 25g / L; The number of moles of hydrogen peroxide: NaAlO in waste liquid 2 The number of moles = 25:1;

[0061] Step 3:

[0062] (1) The reaction mixture is separated from solid and liquid by vacuum filtration to obtain AlOOH crystal filter cake and filtrate;

[0063] (2) After the AlOOH c...

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Abstract

The invention relates to a recycling method for aluminum in an aluminum alloy chemical milling waste liquid, and belongs to the technical fields of recovery and recycling of aluminum alloy alkaline chemical milling waste liquids. The method specially comprises the following steps: 1) performing separation treatment: performing centrifugation on the aluminum-containing alloy chemical milling wasteliquid, and removing a precipitate in the waste liquid; 2) under normal temperature and normal pressure, adding hydrogen peroxide into the precipitate-removed waste liquid, and performing a full reaction to obtain a reaction mixture; and 3) performing solid-liquid separation on the reaction mixture to obtain a AlOOH crystal filter cake and a filtrate; and washing the AlOOH crystal filter cake by using water, and performing drying to prepare nano AlOOH. The method provided by the invention has a short production process, small demand for equipment and a fast reaction speed; the recovery rate ofaluminum resources in the chemical milling waste liquid is up to 83%; the prepared product is the orthorhombic AlOOH with a particle size of 50-200 nm, and has a nano structure and the advantages ofa large specific surface area and high purity; and the method facilitates industrial production and applications of medicines, catalysts, adsorbents, ceramics and fireproof materials.

Description

technical field [0001] The invention belongs to the technical field of recovery and recycling of aluminum alloy alkaline chemical milling waste liquid, and in particular relates to a recycling method for aluminum in aluminum alloy chemical milling waste liquid. Background technique [0002] Chemical milling is a tool-free, chip-free, and stress-free special processing technology. It corrodes the predetermined part of the workpiece through chemical solution to obtain the required processing size and process accuracy. The chemical solution required for the reaction is called "chemical milling fluid", and the chemical solution that loses processing ability after the chemical milling reaction is called "chemical milling waste liquid", that is, chemical milling waste liquid. [0003] During the chemical milling process of aluminum alloy, the aluminum material is corroded by the alkaline chemical milling solution and dissolved in the chemical milling solution, which increases the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14B82Y40/00
CPCB82Y40/00C01F7/14C01P2002/72C01P2004/03C01P2004/62C01P2004/64C01P2006/12C01P2006/14C01P2006/16
Inventor 魏砾宏蔡炜杨天华李彦龙
Owner SHENYANG AEROSPACE UNIVERSITY
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