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Method for treating aluminum ash in aluminum industrial production

A technology of harmless treatment and aluminum ash, which is applied in the field of aluminum ash treatment in the production of aluminum industry to achieve the effects of reducing dust escape, avoiding flammability and explosion, and saving energy and environmental protection costs.

Active Publication Date: 2020-12-29
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of a large amount of aluminum ash waste generated in the production of aluminum industry, the object of the present invention is to provide a method for efficiently processing aluminum ash. Accelerators, etc. can enhance the effect of aluminum ash hydrolysis reaction, achieve the purpose of removing nitrogen in aluminum ash, and turn aluminum ash into a usable harmless powder material after harmless treatment

Method used

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  • Method for treating aluminum ash in aluminum industrial production
  • Method for treating aluminum ash in aluminum industrial production
  • Method for treating aluminum ash in aluminum industrial production

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Example 1 The key process parameter investigation experiment of the method for harmless treatment of aluminum ash.

[0063] The key conditions affecting the harmless hydrolysis of aluminum ash in the method for harmless treatment of aluminum ash provided by the present invention are mainly: ball milling reaction temperature, ball milling slurry liquid-to-solid ratio, and ball milling reaction time. The present invention selects the optimal parameter interval through a single factor experiment, and the primary aluminum ash with a nitrogen content of 5.4% is selected for the experiment.

[0064] 1. The influence of reaction temperature on the hydrolysis effect of ball milling.

[0065] The experiment determined that the reaction time was 2 hours, and the liquid-solid ratio of the ball milling reaction slurry was 1:1. By comparing the nitrogen content of aluminum ash powder after hydrolysis by ball milling at reaction temperatures of 65°C, 75°C, 85°C, 95°C, and 100°C, with...

Embodiment 2

[0072] Take 1000kg of aluminum ash to be treated and add it to the mixing tank, add 800kg of water at a temperature of 25°C, start stirring, and stir at a constant speed of 60r / min for about 0.5h. After the ammonia gas generated is discharged from the exhaust port, use dilute Sulfuric acid absorption, the slurry is transported into the wet ball mill tank through the screw feeder, the ball mill tank is pre-installed with 1000kg of grinding balls, and then 200kg of water at 25°C is added to the ball mill tank, and 20kg of sodium carbonate is added as a catalyst and 20kg of concentrated ammonia water As an accelerator, start the ball mill tank and run it at a speed of 60r / min. Heat the slurry in the ball mill tank to make the reaction temperature reach 95°C. The reaction time is 1h. After the gas generated by the reaction is discharged from the exhaust port, it is absorbed by dilute sulfuric acid. After the reaction, the mixture of slurry and grinding balls is poured into a sievin...

Embodiment 3

[0074] Take 1000kg of aluminum ash to be treated and add it to the mixing tank, add 1200kg of water at a temperature of 25°C, start stirring, and stir at a constant speed of 45r / min for about 0.5h. After the ammonia gas generated is discharged from the exhaust port, use dilute Sulfuric acid absorption, the slurry is conveyed into the wet ball milling tank through the screw feeder, and 1500kg of grinding balls are pre-installed in the ball milling tank, and then 400kg of preheated 75°C water is added to the ball milling tank, and 10kg of sodium hydroxide and A mixture of 15kg of calcium oxide is used as a catalyst, 15kg of concentrated ammonia water and 15kg of absolute ethanol are used as accelerators, and the ball milling tank is started at a speed of 50r / min to heat the slurry in the ball milling tank so that the reaction temperature reaches 90°C and the reaction time is 1.5 h. After the gas generated by the reaction is discharged from the exhaust port, it is absorbed with di...

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Abstract

The invention belongs to the technical field of environment-friendly materials and non-ferrous metal smelting, and particularly relates to a method for treating aluminum ash in aluminum industrial production. According to the method, a wet chemical ball milling process is mainly used for strengthening an aluminum ash reaction, and a catalyst, an accelerant and the like are added to strengthen thehydrolysis reaction effect of the aluminum ash, so that the purpose of removing nitrogen in the aluminum ash is achieved, and the aluminum ash is changed into an available harmless powder material after harmless treatment. According to the harmless aluminum ash treatment method provided by the invention, the aluminum ash is treated by adopting a wet method, so that the risks of flammability, explosiveness and the like of the aluminum ash are avoided, and the operation safety coefficient is improved; mechanical stirring is replaced with a wet ball milling mode, and in the stirring process, thehydrolysis effect of the aluminum ash is enhanced by utilizing the mechanical force of ball milling; and according to the method, the technological process is shortened, the aluminum ash can be further refined while ball-milling aluminum separation is conducted, the reaction is more sufficient, the denitrification effect of the aluminum ash is improved, the reaction time is shortened, and energy can be greatly saved in industrial production.

Description

technical field [0001] The invention belongs to the fields of environmental protection material technology and non-ferrous metal smelting technology, and in particular relates to a processing method for aluminum ash in aluminum industrial production. Background technique [0002] Aluminum ash is a kind of highly polluting waste produced in the process of aluminum industry such as primary aluminum production, aluminum alloy and processing, and waste aluminum recycling. The waste is an inevitable product formed by the reaction of aluminum and air at high temperature, and the output is huge. The composition of aluminum ash is complex and varies slightly due to different production processes, raw materials and operating conditions of manufacturers, but it usually contains metal aluminum, aluminum oxides, nitrides, chloride salts and some other components. At present, after the aluminum ash is separated from the entrained metal aluminum, most of it is stockpiled or landfilled. ...

Claims

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Application Information

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IPC IPC(8): C04B18/14C01C1/02C04B20/02C22B21/00C22B7/00
CPCC01C1/02C04B18/149C04B20/02C04B20/023C04B20/026C22B7/006C22B21/0023Y02W30/91Y02P10/20
Inventor 姜澜张靖宙杨洪亮李子申丁友东付高峰
Owner NORTHEASTERN UNIV
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