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Production method of oxygen-containing beta aluminum fluoride for aluminum electrolysis bath by using aluminium scruff ash

A technology of β-alumina and aluminum electrolytic cells, applied in chemical instruments and methods, aluminum compounds, nitrogen oxides/oxyacids, etc., can solve problems such as aluminum ash pollution, achieve high activity, meet electrolytic production, and solubility Good results

Active Publication Date: 2008-05-14
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to aim at the deficiencies in the above-mentioned prior art, to provide a kind of can effectively solve the environmental pollution problem of the aluminum ash produced when producing raw aluminum, and the aluminum ash can be recycled and utilized to produce aluminum by using waste aluminum ash Method for using fluorine-containing β-alumina in an electrolytic cell

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Mix and stir 50Kg cast pure electrolytic aluminum ingot waste aluminum ash and 150Kg water to fully dissolve the soluble matter in the ash.

[0027] (2) Filter and dehydrate to obtain 42.5kg of wet ash with a water content of less than 8%, and the aqueous solution is evaporated to obtain a mixture of 10.4KgNaCl, KCl, and NaF.

[0028] (3) Add the washed ash into 90Kg of dilute hydrochloric acid solution with pH=6, and stir and hydrolyze in a closed container at a constant temperature of 90°C for 4 hours. Dehydration to obtain 44.6Kg of ash with a water content of less than 3% after hydrolysis.

[0029] (4) Put the hydrolyzed ash into a high-temperature furnace and calcinate for 100 minutes at 1200° C. to obtain about 36 kg of fluorine-containing β-alumina.

[0030] The composition of the prepared fluorine-containing β-alumina is as follows: Al2O3: 94.48%, SiO2: 1.15%, NaO: 3.14%, Fe2O3: 0.62%, loss of ignition: 0.51%.

Embodiment 2

[0032] (1) Mix and stir 50Kg cast pure electrolytic aluminum ingot waste aluminum ash and 150Kg water to fully dissolve the soluble matter in the ash.

[0033] (2) Filter and dehydrate to obtain 41 kg of wet ash with a water content of less than 3%, and the aqueous solution is evaporated to obtain a mixture of 10.3 KgNaCl, KCl, and NaF.

[0034] (3) Put the washed and dehydrated ashes into a high-temperature furnace and spread them out, and calcinate them for 120 minutes at 1200°C with sufficient air to obtain about 36Kg of fluorine-containing β-alumina.

[0035] The composition of the prepared fluorine-containing β-alumina is as follows: Al2O3: 94.25%, SiO2: 1.35%, NaO: 3.20%, Fe2O3: 0.52%, loss of ignition: 0.64%.

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Abstract

The invention relates to a method utilizing the primary aluminum lime to produce the fluoride-bearing Beta alumina used on the aluminum electrolytic bath. The invention is characterized in that the process is to add the primary aluminum lime into the water with a weight of 1 to 3 times of the aluminum lime for immersion cleaning, filtering and dehydration; vapor the solution after the filtering and dehydration to obtain the mixture crystallization of the NaCl, the KCl and the NaF; add the dehydrated aluminum lime into the dilute hydrochloric acid solution for sufficient mixing; stir the solution for 3 to 5 hours at a temperature of 80 to 100 DEG C to generate the NH3 and the Al(OH)3; calcine the Al(OH)3 generated after the hydrolysis to prepare the fluoride-bearing Beta alumina. The invention has the advantages that the produced fluoride-bearing alumina has higher activation and can dissolve in the electrolyte very well and be used for electrolysis production; not only the environment pollution generated by the aluminum lime during the preparation of the primary aluminum can be solved, but also the industrial waste can be transformed to the resource for full utilization.

Description

technical field [0001] The invention relates to a method for producing fluorine-containing β-alumina for an aluminum electrolytic cell by using primary aluminum waste ash. technical background [0002] Aluminum ash is slag and floating skin from the production process of primary aluminum ingots, various aluminum alloys and aluminum profiles. With the development of the electrolytic aluminum industry, the output of aluminum ash has increased rapidly. Only the production process of primary aluminum electrolysis will produce Tens of thousands of tons of aluminum ash. Aluminum ash has different components due to its different sources and production processes, which greatly increases the difficulty of processing and recycling. Therefore it is difficult to find a general method to deal with all kinds of aluminum ash, and a large amount of aluminum ash has caused huge pollution to the environment for a long time. Compared with the aluminum ash produced in the production process o...

Claims

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Application Information

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IPC IPC(8): C01F7/22C01C1/02C01B21/38
Inventor 柴登鹏赵庆云
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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