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Method for efficiently separating fluorine, chlorine and nitrogen components from aluminum ash for co-production of aluminum oxide concentrate

A technology of alumina and aluminum ash, applied in aluminate/alumina/aluminum hydroxide purification, ammonium chloride, alkali metal chloride, etc., to achieve the effect of simple equipment, efficient separation and recycling, and efficient separation

Active Publication Date: 2019-10-08
郑州中科新兴产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processing purpose of this technology is mainly to recover the effective components of metal aluminum and aluminum nitride in aluminum ash. Soluble fluoride salts and chloride salts will enter the sodium aluminate solution during the processing process, which may have certain adverse effects on the alumina production system.

Method used

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  • Method for efficiently separating fluorine, chlorine and nitrogen components from aluminum ash for co-production of aluminum oxide concentrate
  • Method for efficiently separating fluorine, chlorine and nitrogen components from aluminum ash for co-production of aluminum oxide concentrate

Examples

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Embodiment 1

[0038] In this embodiment, the method for efficiently separating fluorine, chlorine, and nitrogen components from aluminum ash to co-produce alumina concentrate, the specific steps are as follows:

[0039] (1) Desalination and denitrification: Weigh the secondary aluminum ash from an enterprise in Gongyi and put it into the reactor, add water as a solvent according to the ratio of liquid to solid ratio of 2; turn on the stirring and heating control device of the reactor, at 75 Stir at high speed for 2 hours at a temperature of ℃, and the gas generated during the reaction is introduced into the gas absorption device through the pipeline;

[0040] (2) Solid-liquid separation: After the reaction is completed, the slurry is released, and the solid-liquid two-phase is separated by suction filtration;

[0041] (3) Defluorination: Add the separated solid phase and lye with a concentration of 150g / L into the reaction kettle at a ratio of liquid to solid ratio of 2, mix thoroughly, and...

Embodiment 2

[0050] In this embodiment, the method for efficiently separating fluorine, chlorine, and nitrogen components from aluminum ash to co-produce alumina concentrate, the specific steps are as follows:

[0051] (1) Desalination and denitrification: add aluminum ash and water to the reactor according to the ratio of liquid to solid ratio of 1.5, turn on the stirring and heating control device of the reactor, and stir at a high speed for 4 hours at a temperature of 25°C. The gas is introduced into the gas absorption device through the pipeline;

[0052] (2) Solid-liquid separation: After the reaction is completed, the slurry is released, and the solid-liquid two-phase is separated by means of pressure filtration;

[0053] (3) Defluorination: Add the separated solid phase and lye with a concentration of 200g / L into the reaction kettle at a liquid-solid ratio of 1.5, mix well, and react at room temperature of 25°C for 4 hours , the gas produced in the reaction process is introduced in...

Embodiment 3

[0062] In this embodiment, the method for efficiently separating fluorine, chlorine, and nitrogen components from aluminum ash to co-produce alumina concentrate, the specific steps are as follows:

[0063] (1) Desalination and denitrification: Weigh the secondary aluminum ash from an enterprise in Gongyi and put it into the reactor, add water as a solvent according to the ratio of liquid to solid ratio of 2; turn on the stirring and heating control device of the reactor, at 50 Stir at high speed for 3 hours at a temperature of ℃, and the gas generated during the reaction is introduced into the gas absorption device through the pipeline;

[0064] (2) Solid-liquid separation: After the reaction is completed, the slurry is released, and the solid-liquid two-phase is separated by suction filtration;

[0065] (3) Defluorination: Add the separated solid phase and lye with a concentration of 200g / L into the reaction kettle at a liquid-solid ratio of 2, mix well, and then keep warm at...

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Abstract

The invention discloses a method for efficiently separating fluorine, chlorine and nitrogen components from aluminum ash for co-production of aluminum oxide concentrate. The method comprises the following steps: putting aluminum ash and water into a reaction kettle, performing desalination denitrification treatment, performing solid-liquid separation on slurry after desalination denitrification treatment, sufficiently mixing a solid phase obtained after separation with an alkali liquid, performing a defluorination reaction, performing filtration, washing and separation on a defluorination slurry so as to obtain a solid phase and a liquid phase, wherein the obtained solid phase is aluminum oxide concentrate; performing a neutralization reaction on the liquid phase by using a diluted acid, and adjusting the pH value of the solution to be neutral; performing a solution defluorination reaction on the blended neutral solution with the liquid phase obtained after desalination denitrification; performing a sufficient defluorination reaction on the solution, and performing solid-liquid separation so as to obtain a solid phase, namely a fluorine salt; and performing evaporation crystallization on the liquid phase after solid-liquid separation, so as to obtain a crystallization product, namely a chlorine salt. Due to the desalination denitrification process and the defluorination process, products such as ammonium hydroxide, the chlorine salt, the fluorine salt and the high-purity aluminum oxide concentrate can be prepared, and efficient separation of aluminum oxide, salts and toxicand harmful components in the aluminum ash can be achieved.

Description

technical field [0001] The invention relates to the technical field of aluminum ash recycling and utilization produced in electrolytic aluminum and aluminum processing technology, in particular to a method for separating and recovering alumina, chloride salts, fluorine salts and ammonia from aluminum ash. Background technique [0002] Aluminum ash is a solid waste produced during the production of electrolytic aluminum or aluminum processing and smelting. It is mainly composed of cooled metal aluminum, oxides produced during high temperature processes, fluxes, and electrolyte salts. According to literature reports, about 20-40kg of aluminum ash is produced for every 1 ton of primary aluminum produced; about 100-250kg of aluminum ash is produced for every 1 ton of waste aluminum recovered and regenerated. The main components of aluminum ash include alumina, metal aluminum, aluminum nitride, and soluble electrolyte salts; according to different processing links, aluminum ash i...

Claims

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Application Information

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IPC IPC(8): C01F7/46C01F11/22C01D3/04C01C1/16C01B3/02
CPCC01B3/02C01C1/164C01D3/04C01F7/46C01F11/22
Inventor 田登超郭强李永利付明波邵大伟
Owner 郑州中科新兴产业技术研究院
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