System for preparing aluminum-magnesium spinel from secondary aluminum ash

Abstract

The utility model provides a system for preparing magnesium-aluminum spinel from secondary aluminum ash, which comprises a reaction system, a storage system and a filtering system, the reaction system comprises a hydrolysis tank, an alkali washing tank, an acid washing tank and a calcining furnace, the storage system comprises a first storage tank, a second storage tank and a third storage tank, and the filtering system comprises a filter press; the hydrolysis pool and the alkaline washing pool are both connected with a feeding port of the filter press through an input pipe, a liquid outlet of the filter press is connected with the first storage tank and the third storage tank through an output pipe, the input pipe and the output pipe are both Y-shaped pipes, two branch pipes of the input pipe are connected with the first draw-off pump and the second draw-off pump respectively, and the first draw-off pump is connected with the second draw-off pump. Two branch pipes of the output pipe are fixedly connected with the first storage tank and the third storage tank in a sealed mode respectively, secondary aluminum ash difficult to treat is recycled through the system, by-products obtained after reaction are all safe substances, and recycling of the secondary aluminum ash is achieved under the condition that environmental pollution is solved.

Description

Technical Field

[0001] The utility model relates to the field of secondary aluminum ash recovery, in particular to a system for preparing aluminum-magnesium spinel from secondary aluminum ash. Background Art

[0002] Aluminum ash is a hazardous waste generated by the electrolytic aluminum, aluminum processing and aluminum recycling industries, with an annual emission of more than 4 million tons. Direct emission will cause serious environmental pollution. Aluminum ash contains a large amount of aluminum-containing resources such as aluminum oxide, aluminum nitride and metallic aluminum, as well as toxic components such as fluorides, chlorides and nitrides. In view of the hazard and resource nature of aluminum ash, it is necessary to recycle and safely dispose of aluminum ash. In addition, magnesium-aluminum spinel is a high-quality refractory raw material with the advantages of high temperature resistance, small thermal expansion coefficient, good thermal stability and strong slag resistance. It is widely used in steel smelting, cement rotary kilns and glass industrial kilns. Therefore, a system for preparing aluminum-magnesium spinel using secondary aluminum ash is urgently needed to recycle the secondary aluminum ash. Summary of the invention

[0003] In view of the above problems, the utility model provides a system for preparing aluminum-magnesium spinel from secondary aluminum ash.

[0004] To achieve the above object, the utility model adopts the following technical scheme: a system for preparing aluminum-magnesium spinel from secondary aluminum ash, comprising a reaction system, a storage system and a filtration system, wherein the reaction system comprises a hydrolysis tank, an alkali washing tank, an acid washing tank and a calcining furnace, the storage system comprises a first storage tank, a second storage tank and a third storage tank, and the filtration system comprises a filter press;

[0005] The hydrolysis tank and the alkali washing tank are both connected to the feed port of the filter press through an input pipe, and the liquid outlet of the filter press is respectively connected to the first storage tank and the third storage tank through an output pipe. A first extraction pump is arranged at the bottom of the hydrolysis tank, and a second extraction pump is arranged at the bottom of the alkali washing tank. The input pipe is a Y-shaped pipe, and the two branches of the input pipe are respectively connected to the first extraction pump and the second extraction pump. A steering valve is arranged at the intersection of the branches of the input pipe. The output pipe is also a Y-shaped pipe, and the two branches of the output pipe are respectively sealed and fixedly connected to the first storage tank and the third storage tank, and a steering valve is also arranged at the intersection of the branches of the output pipe.

[0006] Preferably, the hydrolysis tank is a sealed structure, and a feed inlet and an exhaust hole are provided on the upper wall of the hydrolysis tank, and the exhaust hole is sealedly connected to the second storage tank through an air pipe.

[0007] Preferably, the wall of the hydrolysis tank is an anti-cavitation baffle.

[0008] Preferably, the first storage tank is used to store the filtrate obtained after the slurry in the hydrolysis tank is filtered by the filter press, and the third storage tank is used to store the filtrate obtained after the slurry in the alkali washing tank is filtered by the filter press.

[0009] Preferably, the calcining furnace includes a drying device, a pressing device and a combustion furnace, the drying device is used to dry the filter cake after being pickled in the pickling tank, the pressing device is used to press the filter cake after being dried by the drying device, and the combustion furnace is used to calcine the pressed filter cake.

[0010] Compared with the prior art, the beneficial effects of the utility model are: through the system, the secondary aluminum ash that is difficult to handle is recycled and reused, and the products after the reaction are all substances that can be put into production, such as ammonia water, hydrolyzate for preparing calcium fluoride, etc., while solving the environmental pollution, the recycling of secondary aluminum ash is also achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of a system for preparing aluminum-magnesium spinel from secondary aluminum ash of the utility model;

[0012] Figure 2 This is a schematic diagram of a hydrolysis tank for preparing aluminum-magnesium spinel from secondary aluminum ash in the utility model. DETAILED DESCRIPTION

[0013] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the present invention is described in detail below with reference to the embodiments.

[0014] Please refer to Figure 1 and Figure 2 A system for preparing aluminum-magnesium spinel from secondary aluminum ash according to an embodiment of the utility model comprises a reaction system, a storage system and a filtration system. The reaction system comprises a hydrolysis tank 1, an alkali washing tank 2, an acid washing tank 3 and a calcining furnace 4. The storage system comprises a first storage tank 5, a second storage tank 6 and a third storage tank 7. The filtration system comprises a filter press 10.

[0015] The hydrolysis tank 1 and the alkali washing tank 2 are both connected to the feed port of the filter press 10 through the input pipe 8, and the liquid outlet of the filter press 10 is respectively connected to the first storage tank 5 and the third storage tank 7 through the output pipe 9. A first extraction pump is arranged at the bottom of the hydrolysis tank 1, and a second extraction pump is arranged at the bottom of the alkali washing tank 2. The input pipe 8 is a Y-shaped pipe, and the two branches of the input pipe 8 are respectively connected to the first extraction pump and the second extraction pump. A steering valve is arranged at the intersection of the branches of the input pipe 8. The output pipe 9 is also a Y-shaped pipe, and the two branches of the output pipe 9 are respectively sealed and fixedly connected to the first storage tank 5 and the third storage tank 7, and a steering valve is also arranged at the intersection of the branches of the output pipe 9.

[0016] After the secondary aluminum ash is hydrolyzed in the hydrolysis tank 1, it becomes a slurry and is extracted by the first extraction pump into the filter press 10 for filtration to obtain a filter cake and a hydrolyzate. At this time, the hydrolyzate is discharged to the first storage tank 5 through the output pipe 9 for storage, and is used to prepare calcium fluoride after precipitation. The obtained filter cake is sent to the alkali washing tank 2 for alkali dissolution reaction, and the steering valve is adjusted so that the Y-type tube only opens the passage between the alkali washing tank 2 and the filter press 10. The obtained alkali-soluble slurry is extracted by the second extraction pump into the filter press 10 for filter pressure to obtain an alkali-soluble filter cake and an aluminum-containing solution. The aluminum-containing solution is discharged into the third storage tank 7 through the output pipe 9. The obtained alkali-soluble filter cake is sent to the acid washing tank 3 for washing and filtration, and then sent to the calcining furnace 4 for calcination into magnesium-aluminum spinel. The system recycles and reuses the difficult-to-handle secondary aluminum ash, and converts the secondary aluminum ash that is easy to pollute the environment into a new substance that can be put into production. It not only solves the problem that the secondary aluminum ash is difficult to handle and easy to pollute the environment, but also increases the additional income of the factory, killing two birds with one stone.

[0017] Preferably, the hydrolysis tank 1 is a sealed structure, and a feed inlet and an exhaust hole are provided on the upper wall of the hydrolysis tank 1, and the exhaust hole is sealedly connected to the second storage tank 6 through an air pipe.

[0018] Since the aluminum ash in the hydrolysis tank 1 undergoes a hydrolysis reaction to generate ammonia, the hydrolysis tank 1 needs to be a sealed structure to facilitate the collection of ammonia generated by the hydrolysis reaction of the aluminum ash. The generated ammonia enters the second storage tank 6 from the exhaust hole above the hydrolysis tank 1 for storage. A solution for collecting ammonia, such as water, can be injected into the second storage tank 6, thereby improving the collection efficiency of secondary aluminum ash recyclables.

[0019] Preferably, the wall of the hydrolysis tank 1 is an anti-cavitation baffle, which can effectively prevent the gas generated by the hydrolysis of secondary aluminum ash from corroding the hydrolysis tank 1, thereby ensuring the service life of the entire hydrolysis tank 1 and the safety of the recycling process.

[0020] Preferably, the first storage tank 5 is used to store the filtrate from the slurry in the hydrolysis tank 1 after filtering through the filter press 10, and the third storage tank 7 is used to store the filtrate from the slurry in the alkali washing tank 2 after filtering through the filter press 10. In the whole process of preparing aluminum-magnesium spinel from secondary aluminum ash, the first storage tank 5 is used to store the hydrolyzate for preparing calcium fluoride, and the third storage tank 7 is used to store the aluminum-containing solution for preparing alumina. Various by-products of preparing magnesium-aluminum spinel from secondary aluminum ash are collected and used to prepare other industrial materials, thereby avoiding waste and improving the recovery efficiency of secondary aluminum ash.

[0021] Preferably, the calcining furnace 4 includes a drying device, a pressing device and a combustion furnace. The drying device is used to dry the filter cake after pickling in the pickling tank 3, the pressing device is used to press the filter cake after drying by the drying device, and the combustion furnace is used to calcine the pressed filter cake. As the last step in making aluminum-magnesium spinel, the filter cake after pickling and washing is calcined at a calcination rate of 4 to finally form aluminum-magnesium spinel. The calcining furnace 4 can provide a temperature that is easy to control for the filter cake, so that the filter cake is finally formed into aluminum-magnesium spinel after heating, thereby completing the process of recovering secondary aluminum ash to make aluminum-magnesium spinel.

[0022] As described above, in actual use, the utility model adds the secondary aluminum ash and the hydrolyzate into the hydrolysis tank 1 through the feed port, and after the secondary aluminum ash is hydrolyzed by the hydrolysis tank 1, it becomes a slurry and is extracted by the first extraction pump into the filter press 10 for filtration, and a filter cake and a hydrolyzate are obtained. At this time, the hydrolyzate is discharged into the first storage tank 5 through the output pipe 9 for storage, and is used to prepare calcium fluoride after precipitation. The obtained filter cake is sent to the alkaline washing tank 2 for alkaline dissolution reaction, and the steering valve is adjusted so that the Y-type tube only opens the passage between the alkaline washing tank 2 and the filter press 10, and the obtained alkaline soluble slurry is discharged by the first storage tank 5. The second extraction pump extracts into the filter press 10 for filtration to obtain an alkali-soluble filter cake and an aluminum-containing solution. The aluminum-containing solution is discharged into the third storage tank 7 through the output pipe 9, and the obtained alkali-soluble filter cake is sent to the pickling tank 3 for washing and filtration, and then sent to the calcining furnace 4 for calcining into magnesium-aluminum spinel. The system can recycle and reuse the difficult-to-handle secondary aluminum ash, and convert the secondary aluminum ash that is easy to pollute the environment into a new substance that can be put into production. It not only solves the problem that the secondary aluminum ash is difficult to handle and easy to pollute the environment, but also increases the additional income of the factory, killing two birds with one stone.

[0023] The present invention has been described by the above-mentioned relevant embodiments, but the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A system for preparing aluminum-magnesium spinel from secondary aluminum ash, characterized in that: It comprises a reaction system, a storage system and a filtration system, wherein the reaction system comprises a hydrolysis tank (1), an alkali washing tank (2), an acid washing tank (3) and a calcining furnace (4), the storage system comprises a first storage tank (5), a second storage tank (6) and a third storage tank (7), and the filtration system comprises a filter press (10); The hydrolysis tank (1) and the alkali washing tank (2) are both connected to the feed port of the filter press (10) through an input pipe (8); the liquid outlet of the filter press (10) is respectively connected to the first storage tank (5) and the third storage tank (7) through an output pipe (9); a first extraction pump is arranged at the bottom of the hydrolysis tank (1); a second extraction pump is arranged at the bottom of the alkali washing tank (2); the input pipe (8) is a Y-shaped pipe; two branches of the input pipe (8) are respectively connected to the first extraction pump and the second extraction pump; a steering valve is arranged at the intersection of the branches of the input pipe (8); the output pipe (9) is also a Y-shaped pipe; two branches of the output pipe (9) are respectively sealed and fixedly connected to the first storage tank (5) and the third storage tank (7); a steering valve is also arranged at the intersection of the branches of the output pipe (9).

2. The system for preparing aluminum-magnesium spinel from secondary aluminum ash according to claim 1, characterized in that: The hydrolysis tank (1) is a sealed structure, and a feed inlet and an exhaust hole are provided on the upper wall of the hydrolysis tank (1), and the exhaust hole is sealedly connected to the second storage tank (6) via an air pipe.

3. The system for preparing aluminum-magnesium spinel from secondary aluminum ash according to claim 1, characterized in that: The wall of the hydrolysis tank (1) is an anti-cavitation baffle.

4. The system for preparing aluminum-magnesium spinel from secondary aluminum ash according to claim 1, characterized in that: The first storage tank (5) is used to store the filtrate obtained after the slurry in the hydrolysis tank (1) is filtered by the filter press (10), and the third storage tank (7) is used to store the filtrate obtained after the slurry in the alkali washing tank (2) is filtered by the filter press (10).

5. The system for preparing aluminum-magnesium spinel from secondary aluminum ash according to claim 1, characterized in that: The calcining furnace (4) comprises a drying device, a pressing device and a combustion furnace. The drying device is used to dry the filter cake after being pickled in the pickling tank (3). The pressing device is used to press the filter cake after being dried by the drying device. The combustion furnace is used to calcine the pressed filter cake.

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