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Waste acid treatment method after aluminum profile and aluminum alloy cleaning

A waste acid treatment, aluminum alloy technology, applied in chemical instruments and methods, phosphorus compounds, fertilizer mixtures, etc., can solve the problems of resource waste and achieve high economic benefits

Active Publication Date: 2017-11-24
高嵘
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the PO in the waste acid could not be 4 3- , SO 4 2- , NO 3 - 、Al 3+ Recycling and recycling, resulting in waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The invention provides a method for treating waste acid after cleaning aluminum profiles and aluminum alloys, comprising the following steps:

[0040] S101: Add potassium hydroxide to the waste acid solution after cleaning the aluminum profiles and aluminum alloys. The pH value is 6.5, the Baume degree is 30, the temperature is 100°C, and the time is 50 minutes. Cool down to crystallize. Among them, the raw material components of the waste acid solution after cleaning aluminum profiles and aluminum alloys are: 12% phosphoric acid, 20% sulfuric acid and Al 3+ 50g / L.

[0041] S102: performing solid-liquid separation on the product obtained in S101 to obtain a first liquid phase and a first solid phase.

[0042] S103: Concentrate the first liquid phase obtained in S102, control the Baume degree value during the liquid phase concentration process to 40, then cool to crystallization and then filter to separate to obtain a second liquid phase and a second solid phase.

[0...

Embodiment 2

[0046] The invention provides a method for treating waste acid after cleaning aluminum profiles and aluminum alloys, comprising the following steps:

[0047] S101: Add potassium hydroxide to the waste acid solution after cleaning aluminum profiles and aluminum alloys. The pH value is 7.5, the Baume degree is 33, the temperature is 95°C, and the time is 80 minutes. Cool down to crystallize. The raw material components of the waste acid solution after cleaning aluminum profiles and aluminum alloys are: 10% phosphoric acid, 25% sulfuric acid and Al 3+ 30g / L.

[0048] S102: performing solid-liquid separation on the product obtained in S101 to obtain a first liquid phase and a first solid phase.

[0049] S103: Concentrate the first liquid phase obtained in S102, control the Baume degree value during the liquid phase concentration process to 45, then cool to crystallization and filter to obtain a second liquid phase and a second solid phase.

[0050] S104: Add phosphoric acid to ...

Embodiment 3

[0053] The invention provides a method for treating waste acid after cleaning aluminum profiles and aluminum alloys, comprising the following steps:

[0054] S101: Add potassium hydroxide to the waste acid solution after cleaning aluminum profiles and aluminum alloys. The pH value is 7.0, the Baume degree is 32, the temperature is 98°C, and the time is 70 minutes. Cool down to crystallize. Among them, the raw material components of the waste acid solution after cleaning aluminum profiles and aluminum alloys are: 10% phosphoric acid, 22% sulfuric acid, 0.8% nitric acid and Al 3+ 40g / L.

[0055] S102: performing solid-liquid separation on the product obtained in S101 to obtain a first liquid phase and a first solid phase.

[0056] S103: Concentrate the first liquid phase obtained in S102, control the Baume degree value during the liquid phase concentration process to 43, then cool to crystallization and filter to obtain a second liquid phase and a second solid phase.

[0057]...

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PUM

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Abstract

The invention relates to a waste acid treatment method after aluminum profile and aluminum alloy cleaning. The method comprises the following steps: S101, adding alkaline substances into a waste acid solution after aluminum profile and aluminum alloy cleaning, uniformly stirring under the conditions of the pH value of 6.5-7.5, the Baume degree of 30-40, the temperature of 90-100 DEG C and the time of 40-80 minutes, and cooling until a crystal is formed; S102, performing solid-liquid separation on the product obtained in the S101 so as to obtain a solid phase, drying the solid phase to serve as a water-soluble fertilizer, adding the alkaline substances into the liquid phase, and regulating the pH value and other reaction indexes, thereby obtaining the phosphate product. According to the waste acid treatment method provided by the invention, wastewater emission is avoided, and any secondary waste residue is avoided; and moreover, PO4<3->, SO4<2->, NO3<-> and Al<3+> in the waste acid can be recovered, resource recycling is effectively realized, the economic benefits with high additional value are produced, and clean production in the whole process is realized.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater, in particular to a method for treating waste acid after cleaning aluminum profiles and aluminum alloys. Background technique [0002] At present, there are more than 600 aluminum profile production enterprises in my country, which produce more than 2 million tons of aluminum profiles every year. The main raw materials for chemical polishing of aluminum and aluminum alloy products are phosphoric acid, sulfuric acid, etc., and the main raw materials used by manufacturers are phosphoric acid, sulfuric acid, nitric acid, etc. . At present, the methods used to treat waste acid of aluminum profiles are divided into three categories: physical treatment, chemical treatment and biological treatment. However, the final result of these three processing methods is to make the PO 4 3- , SO 4 2- , NO 3 - 、Al 3+ Insoluble phosphate, sulfate, nitrate, and hydroxide precipitates are generated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30C05G3/00C05F7/00
CPCC01B25/30C05D1/02C05F7/00C05G3/00Y02A40/20
Inventor 高嵘
Owner 高嵘
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