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Method for recovering aluminum oxide, chlorine salt and villiaumite from aluminum ash

A technology of alumina and aluminum ash, which is applied in the field of recovering alumina, chloride salts and fluorine salts from aluminum ash, can solve the problem of poor economy, waste of dissolved aluminum alkali and energy consumption, and does not consider the chloride and fluoride salts in aluminum ash Recycling and other issues, to achieve the effect of strong operability, high recovery rate, and easy access to raw materials

Inactive Publication Date: 2013-04-24
HUNAN CHUANGYUAN ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But there are many deficiencies in the above-mentioned technology: 1. The direct recovery of aluminum in aluminum ash is not considered when recycling waste aluminum ash to prepare aluminum hydroxide, allowing the elemental aluminum in aluminum ash to return to the aluminum hydroxide production process, wasting the time of dissolving aluminum in vain Alkali and energy consumption; 2. The recycling of chloride and fluoride salts in aluminum ash is not considered; 3. The recovery rate of elemental aluminum in aluminum ash is not high, and the process of producing alumina from aluminum ash is complicated and economical

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for reclaiming aluminum oxide, chloride salts and fluorine salts from aluminum ash, comprising the following steps:

[0028] A. Recombining the aluminum ash out of the furnace at 700°C-850°C until the aluminum in the aluminum ash is separated from the slag.

[0029] Aluminum ash compounding is to introduce high-temperature aluminum ash into the ash frying machine and continuously rotate and stir, so that the fine liquid granular aluminum contained in it is continuously combined to expand the volume until the naked eyes can distinguish aluminum liquid particles and slag solids. Afterwards, the molten aluminum can be sucked out or naturally settled to separate from the slag. The re-smelting temperature is preferably 700°C-850°C. If the temperature is too low, the molten aluminum will easily fuse with the slag, making it difficult to separate. If the temperature is too high, the slag will be easily broken into smaller particles, which will affect the purity of the...

Embodiment 2

[0040] Step A: 200kg of hot aluminum ash is re-melted at 750°C. After the aluminum in the aluminum ash is separated from the slag, the molten aluminum is sucked out and sent to the casting process to recover the slag.

[0041] Step B. Mill the molten slag with a ball mill for 3 hours, then sieve through a 30-mesh sieve, and send the slag over 30-mesh to the casting process for smelting.

[0042] Step C, the residual ash below 30 mesh is leached with water for 150 minutes, the leaching solid-to-liquid weight ratio is 1:15, stirring during the leaching process, so that the chloride salt and fluoride salt in the aluminum ash are fully dissolved and enter the liquid phase.

[0043] Step D, performing solid-liquid separation, recovering the solid phase and the liquid phase.

[0044] Step E, the liquid phase is evaporated and crystallized at 120° C. to recover chloride and fluoride salts, the main components of which are sodium chloride, potassium chloride, magnesium chloride and so...

Embodiment 3

[0048] Step A: 200kg of hot aluminum ash is re-melted at 850°C. After the aluminum in the aluminum ash is separated from the slag, the molten aluminum is sucked out and sent to the casting process to recover the slag.

[0049] Step B. Mill the molten slag with a ball mill for 4 hours, then sieve through a 30-mesh sieve, and send the slag over 30-mesh to the casting process for smelting.

[0050] Step C, leaching the residual ash below 30 mesh with water for 110 minutes, the leaching solid-to-liquid weight ratio is 1:10, stirring during the leaching process, so that the chloride salt and fluoride salt in the aluminum ash are fully dissolved and enter the liquid phase.

[0051] Step D, performing solid-liquid separation, recovering the solid phase and the liquid phase.

[0052] Step E, the liquid phase is evaporated and crystallized at 180° C. to recover chloride and fluoride salts, the main components of which are sodium chloride, potassium chloride, magnesium chloride and sodi...

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Abstract

The invention discloses a method for recovering aluminum oxide, chlorine salt and villiaumite from aluminum ash. The method comprises the following steps of: A, re-smelting aluminum ash taken out of a furnace at 700-850 DEG C until aluminum in the aluminum ash is separated from molten slag; B, ball-milling the molten slag, and then, screening by using a 30-mesh screen so as to obtain residual ash of the aluminum ash through screening; C, leaching the residual ash of the aluminum ash in water for 90-200min; D, carrying out solid-liquid separation, and recovering a solid phase and a liquid phase; and E, evaporating the liquid phase to obtain a mixture of the chlorine salt and the villiaumite. According to the embodiment of the invention, more substances are recovered, the recovery rate is high, the recovery rate of aluminum is increased to over 95%, almost of all the aluminum oxide can be recovered, and the recovery rates of the chlorine salt and the villiaumite can also be up to over 85%.

Description

technical field [0001] The invention relates to the technical field of aluminum ash recovery produced in the electrolytic aluminum process, in particular to a method for recovering alumina, chloride salts and fluorine salts from aluminum ash. Background technique [0002] Aluminum ash comes from the smelting process of primary aluminum or secondary aluminum, and is a kind of dross produced by the oxide inclusions of aluminum melt, flux and chemical reaction with flux. It is a kind of industrial waste residue with large output and serious pollution. According to statistics, about 20-40 kg of aluminum ash is produced for every ton of raw aluminum processed, and about 100-250 kg of aluminum ash is produced for one ton of waste aluminum recycled. The amount produced is less when the molten aluminum is directly melted and cast, and the amount produced is more when the aluminum ingot is remelted. The appearance of aluminum ash is silver gray and powdery, and its properties are si...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B21/00C01F7/02
CPCY02P10/20
Inventor 赵斌南唐剑敬叶灵
Owner HUNAN CHUANGYUAN ALUMINUM IND
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