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Aluminum ash recovering and reutilizing method

A technology for aluminum ash slag and filtering slag, which is applied in the field of aluminum ash slag recycling and reuse, can solve the problems of high aluminum ash slag recycling, low utilization rate, heavy environmental burden, etc., and achieve high-value utilization, realize utilization, and reduce pollution. Effect

Inactive Publication Date: 2019-07-05
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for recycling and reusing aluminum ash, which can effectively solve the problems of high cost, low utilization rate and heavy burden on the environment in the prior art.

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preparation example Construction

[0030] Aiming at the problems of high cost, low utilization rate, and burden on the environment in existing aluminum ash recycling or comprehensive utilization, the present invention discloses a recycling and reutilization method of aluminum ash, which can realize resource utilization of aluminum ash without It will pollute the environment, and the recycled filter residue is used to prepare foam ceramics to achieve high-value utilization. Such as figure 1 Shown, in this ceramic foam preparation method, comprise:

[0031] S1 The aluminum ash slag is rolled and ground, and iron impurities are separated by magnetic separation, and metal aluminum is separated by sieving to obtain secondary aluminum ash. In this process, in order to avoid re-oxidation and combustion of metal aluminum, the metal in the aluminum ash slag is pressed into sheets by rolling grinding. The average working pressure of rolling grinding is 60~100Mpa (MPa). The surface linear velocity is 0.2~1m / s (meter / sec...

Embodiment 1

[0037] After grinding the aluminum ash slag with an average working pressure of 60Mpa and a roller surface speed of 0.2m / s, the iron impurities are separated by magnetic separation, and then the elemental metal aluminum is separated by vibratory screening to obtain secondary aluminum ash , wherein the amplitude is 1.5mm, the vibration frequency is 800r / min, and the mesh aperture is 150μm.

[0038] The solid-liquid ratio is 1:5, the temperature is 80°C and the stirring speed is 200 r / min. Under certain conditions, the aluminum nitride in the secondary aluminum ash is decomposed and the salts are removed by washing with water. For the fluorine-containing filtrate produced by water washing, fluorine removal is carried out by adding 1% calcium oxide and stirring for 60 minutes, and then evaporating and crystallizing the defluoridation filtrate at 130°C to obtain sodium salt and potassium salt. At the same time, by The acid absorbs the ammonia gas decomposed by the aluminum nitrid...

Embodiment 2

[0044] After the aluminum ash is ground by rolling with an average working pressure of 70Mpa and a roller surface speed of 0.4m / s, the iron impurities are separated by magnetic separation, and then the elemental metal aluminum is separated by vibratory screening to obtain secondary aluminum ash , where the amplitude is 1.2mm, the vibration frequency is 900r / min, and the mesh aperture is 150μm.

[0045] The stirring speed is 220 r / min when the solid-liquid ratio is 1:8 and the temperature is 70°C. Under certain conditions, the aluminum nitride in the secondary aluminum ash is decomposed and the salts are removed by washing with water. For the fluorine-containing filtrate produced by water washing, fluorine removal is carried out by adding 2% calcium oxide and stirring for 50 minutes, and then evaporating and crystallizing the defluoridation filtrate at 120 ° C to obtain sodium salt and potassium salt. At the same time, by The acid absorbs the ammonia gas decomposed by the alum...

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Abstract

The invention discloses an aluminum ash recovering and reutilizing method. The method includes the steps of S1, rolling and grinding aluminum ash, separating out iron impurities through a magnetic separation method, and separating out metal aluminum through a screening method to obtain secondary aluminum ash; S2, conducting washing operation on the secondary aluminum ash, and decomposing aluminumnitride and salt in the secondary aluminum ash; S3, adding a certain ratio of kaolin, bentonite and talc to washed aluminum-oxide-containing filter residues to be mixed to obtain wet-milled slurry, and further adding a stabilizer (ammonium polyacrylate) and surfactants (carboxymethylcellulose and thermal silica sol) to prepare slurry; S4, impregnating the slurry obtained in the step S3 through organic foam, and conducting multiple times of slurry hanging and drying to obtain a biscuit; S5, conducting glue discharging and firing on the biscuit obtained in the step S4 to obtain foam ceramic. Thehigh-valued utilization rate of the aluminum ash is effectively increased, and meanwhile the environmental pollution is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of comprehensive recycling of aluminum ash, in particular to a method for recycling and reusing aluminum ash. Background technique [0002] Aluminum ash slag is a by-product of aluminum and aluminum alloy smelting, which is composed of alumina, metal aluminum, slagging agent and so on. Generally speaking, one ton of electrolytic aluminum, primary aluminum alloy and secondary aluminum alloy will produce 30~100kg (kilogram) of aluminum ash slag. The "National Hazardous Waste List" (2016) stipulates that aluminum ash slag belongs to HW48 non-ferrous metal smelting waste and is listed as hazardous solid waste. It can be seen that the recovery and utilization of aluminum ash is of great significance to environmental protection, efficient use of resources and sustainable economic development. [0003] Domestic disposal and recycling of aluminum ash mainly include frying ash to extract aluminum, using it as a met...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B38/06
CPCC04B35/622C04B35/62204C04B38/062C04B2235/3418C04B2235/3445C04B2235/349C04B2235/602C04B2235/656C04B2235/6562C04B2235/6567C04B2235/94C04B2235/96
Inventor 刘虎王坤章少华
Owner NANCHANG UNIV
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