Recycling method for mold release waste liquor of aluminum profile factory

An aluminum profile factory, waste liquid recycling technology, applied in chemical instruments and methods, casting molds, cores, etc., can solve the problems of affecting the environment, not achieving zero discharge, full recovery, high cost, etc., achieving simple equipment, low cost effect

Inactive Publication Date: 2016-05-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mold release waste liquid is a waste liquid with a high alkali content. If it is not treated, it will cause greater environmental pollution.
[0003] At present, the commonly used wastewater treatment methods at home and abroad mainly include acid-base neutralization method, chemical precipitation method, coagulation method, adsorption method, microbial method, membrane separation method and constructed wetland method, etc., but these methods are only suitable for The waste water with low volume is treated, and the demoulding waste liquid is a kind of waste liquid with high alkali content. It will cost a lot

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: the sodium hydroxide content of the demoulding waste liquid of certain aluminum profile factory is 390 grams / liter, and aluminum content is 87 grams / liter, and the recycling process of the present invention is:

[0015] (1) Firstly, the demoulding waste hydraulic filter is subjected to solid-liquid separation to remove solid impurities;

[0016] (2) Add the same amount of refined lime slurry to the demoulding waste liquid obtained after press filtration for five times for full stirring. After each addition, fully stir for 2 hours before adding the next time. The refined lime slurry added each time The amount is that every liter of demoulding waste liquid is added the refined lime slurry that the total amount of calcium is 38.9 grams;

[0017] (3) Then carry out solid-liquid separation by pressure filtration, the liquid phase lye obtained by separation contains 321 grams of sodium hydroxide per liter, and can be used as 401 grams of sodium hydroxide after a...

Embodiment 2

[0018] Embodiment 2: the sodium hydroxide content of the demoulding waste liquid of certain aluminum profile factory is 284 grams per liter, and the aluminum content is 65 grams per liter, and the recycling process of the present invention is:

[0019] (1) First, the demoulding waste hydraulic filter is subjected to solid-liquid separation to remove solid impurities;

[0020] (2) Add the same amount of refined lime slurry to the demoulding waste liquid obtained after press filtration in four times for full stirring. After each addition, fully stir for 2 hours before adding the next time. The refined lime slurry added each time The amount is that every liter of demoulding waste liquid is added with refined lime slurry that contains a total amount of calcium of 36.2 grams;

[0021] (3) Then carry out solid-liquid separation by pressure filtration, and the liquid phase lye obtained by separation contains 235 g / l of sodium hydroxide, and can be used as 355 g / l of sodium hydroxide ...

Embodiment 3

[0022] Embodiment 3: the sodium hydroxide content of the demoulding waste liquid of certain aluminum profile factory is 82 grams / liter, and aluminum content is 17 grams / liter, and the recycling process of the present invention is:

[0023] (1) First, the demoulding waste hydraulic filter is subjected to solid-liquid separation to remove solid impurities;

[0024] (2) Add the same amount of refined lime slurry to the demoulding waste liquid obtained after press filtration in four times for full stirring. After each addition, fully stir for 1 hour before adding the next time. The refined lime slurry added each time The amount is that every liter of demoulding waste liquid is added the refined lime slurry that the total amount of calcium is 9.4 grams;

[0025] (3) Then carry out solid-liquid separation by pressure filtration, and the liquid phase lye obtained by separation contains 80.8 g / l of sodium hydroxide, which can be used as 300.8 g / l of sodium hydroxide after adding 220 g...

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Abstract

The invention relates to an alkaline waste liquor recycling method capable of being used for recycling mold release waste liquor in the aluminum profile production process and belongs to the technical field of environmental protection. The method comprises the steps that after the mold release waste liquor is filtered in a pressed mode, refined lime slurry is used for reacting with sodium aluminate in the mold release waste liquor, then aluminum in the mold release waste liquor is removed by means of solid-liquid separation, obtained alkali liquor is added into solid caustic soda to improve concentration, then the alkali liquor can return to be used in the mold release process, and generated calcium aluminate precipitate can serve as high-quality coagulant to be used for treating acid waste water. The method has the advantages of being low in cost and achieving total recovery and zero emission, working procedures and adopted equipment are simple, and the method is an ideal recycling method for the mold release waste liquor of the aluminum profile factory.

Description

technical field [0001] The invention relates to a method for recycling alkaline waste liquid, which can be used for recycling waste liquid from demoulding in the production process of aluminum profiles, and belongs to the technology in the field of environmental protection. Background technique [0002] In the production process of aluminum profile production, aluminum profiles are formed through an extrusion process. Molds are needed for extrusion, and after the extrusion of these molds, the remaining aluminum shaft heads on the mold need to be removed. When removing them, they must be soaked in caustic soda (NaOH) and the lye with a high concentration must be heated at the same time. The demoulding process can only be completed after the aluminum shaft head attached to the mold comes out. These high-concentration sodium hydroxide solutions will dissolve the metal aluminum in the mold, making the mold clean and easy to reuse. The lye used in this mold treatment process wi...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01F7/16C01F7/18C01D1/20C02F1/52B22C3/00C02F103/16
CPCB22C3/00C01D1/20C01F7/164C01F7/18C02F1/5236C02F1/58C02F2101/10C02F2103/16
Inventor 谢逢春肖巧云
Owner SOUTH CHINA UNIV OF TECH
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