Ball milling device for efficiently washing aluminum ash

Abstract

The utility model relates to the technical field of ball mills, and discloses a ball-milling device for efficiently washing aluminum ash, which comprises a main body mechanism, the main body mechanism comprises a reaction device A, a separation device B and a tail gas treatment device C. The reaction device A comprises a ball-milling device, a heating ring is fixedly arranged on the inner side of the ball-milling device, and the tail gas treatment device C is arranged on the separation device B; a feeding port is fixedly formed in the outer end of the left side of the ball milling device, and a discharging port is fixedly formed in the lower end of the right side of the ball milling device. According to the ball-milling device for efficiently washing the aluminum ash, the liquid-solid ratio control of aluminum ash hydrolysis reaction is achieved through the water injection pipe, aluminum nitride in the aluminum ash is efficiently hydrolyzed, soluble impurities are efficiently removed, liquid-solid separation is achieved through the separation device, filter residues are dried through waste heat, metal aluminum elementary substances difficult to extract in the aluminum ash are separated out, and the purity of the aluminum ash is improved. The utilization value of the aluminum ash is greatly improved, and the cost of the aluminum ash ball milling process, the water washing process and the liquid-solid separation in the general technology and the material transportation difficulty caused by device dispersion are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ball mills, in particular to a ball milling device for efficiently washing aluminum ash. Background Technique

[0002] China's recycled aluminum industry is developing rapidly. It is estimated that the demands for recycled aluminum in China from 2022 to 2025 will be 8600 kt, 9800 kt, 10600 kt, and 11500 kt respectively. Therefore, the secondary aluminum ash generated will be approximately 90 kt, 100 kt, 110 kt, and 120 kt respectively. Adding the previously untreated 10000 kt of aluminum ash, the total amount of untreated aluminum ash will accumulate to 10420 kt.

[0003] Secondary aluminum ash is mainly composed of four types of substances: oxides, metallic aluminum, salts, and aluminum nitride. Due to the obvious differences in the composition of aluminum ash from different sources and the high recycling cost, 95% of the aluminum ash is stockpiled and landfilled. Taking the common composition of secondary aluminum ash as an example, it is generally 50 - 65 w% Al2O3, 15 - 30 w% AlN, 5 - 20 w% Al, 5 - 20 w% salts, and 5 - 10 wt% other substances. When landfilled or stockpiled, the aluminum ash will hydrolyze to produce a large amount of ammonia gas, and the chlorides (NaCl, KCl, CaCl2, MgCl2), fluorides (Na3AlF6, NaF, AlF3, CaF2), and heavy metal ions including cadmium (Cd), lead (Pb), chromium (Cr), copper (Cu), and zinc (Zn) it contains may cause soil and groundwater pollution, seriously affecting environmental quality and human health. When recycling and utilizing, the elements F, Cl, N, Na, and K in the aluminum ash will also affect the purity and quality of the products produced. Therefore, from both economic and environmental protection aspects, the impurity elements in the aluminum ash need to be efficiently removed.

[0004] In most of the patents published in China at present, water washing is frequently used as a method for removing impurity elements such as F, Cl, and N in secondary aluminum ash at low cost (CN112661425B and CN114288603A). For the water washing ball milling device of aluminum ash, CN214488253U discloses an efficient defluorination, dechlorination, and denitrification device for aluminum ash slag. The device designs a stirring device in a vertical ball mill to break the aluminum hydroxide coating generated during the hydrolysis process, and the device realizes the removal of nitrogen, fluorine, and chlorine elements in the aluminum ash. However, the device cannot achieve liquid-solid separation, the recovery of metallic aluminum single particles, and the ball milling of the materials at the bottom of the device is not thorough. CN114288603A discloses a denitrification device system and method for secondary aluminum ash. The device designs a steam inlet pipe in a horizontal ball mill, and through the heating and wet milling of the aluminum ash, the efficient removal of aluminum nitride in the aluminum ash is realized. However, the device cannot change the liquid-solid ratio during the reaction process and the recovery of metallic aluminum single particles, and cannot use the existing heating system to dry the wet aluminum ash slag. Summary of the Utility Model

[0005] (1) Technical Problems to be Solved

[0006] The purpose of the present utility model is to provide a ball milling device for efficiently washing aluminum ash, so as to solve the problems raised in the above-mentioned background technology that the liquid-solid ratio in the reaction process cannot be changed, the recovery of metallic aluminum single particles cannot be carried out, and the existing heating system cannot be used to dry wet aluminum ash slag.

[0007] (2) Technical Solutions

[0008] To achieve the above purpose, the present utility model provides the following technical solutions: A ball milling device for efficiently washing aluminum ash, including a main body mechanism. The main body mechanism includes a reaction device, a separation device and a tail gas treatment device. The reaction device includes a ball milling device. A heating ring is fixedly arranged inside the ball milling device. A feed inlet is fixedly arranged at the left outer end of the ball milling device. A discharge outlet is fixedly arranged at the lower right end of the ball milling device. A rotatable insertion tube is movably arranged on the right side of the ball milling device. An exhaust pipe is fixedly installed at the right end of the rotatable insertion tube. A water injection pipe is fixedly installed above the rotatable insertion tube.

[0009] Preferably, a controllable extraction plate is movably arranged at the discharge end of the ball milling device. An annular iron net is fixedly arranged below the controllable extraction plate. A sieve mesh is fixedly arranged below the annular iron net.

[0010] Preferably, a suction filtration pipe is fixedly arranged below the discharge outlet. A filter screen is fixedly arranged at the feed end of the suction filtration pipe. A suction filtration device is movably arranged below the suction filtration pipe.

[0011] Preferably, a tail gas absorption device is movably arranged below the exhaust pipe. A water injection pipe valve is movably arranged above the rotatable insertion tube. An exhaust pipe valve is movably arranged on the right side of the rotatable insertion tube.

[0012] Preferably, in S2, the rotatable insertion tube is connected to the water injection pipe and the exhaust pipe, and both are provided with control valves.

[0013] Preferably, in S3, the size of the annular iron net can be adjusted according to the grinding balls, and the mesh number of the sieve mesh is 170 - 200 meshes.

[0014] Preferably, in S4, the tail gas absorption device contains boric acid solution.

[0015] The ball milling device for highly efficient water-washed aluminum ash is heated by a heating ring, and the water injection pipe realizes the control of the liquid-solid ratio of the hydrolysis reaction of aluminum ash, achieving the highly efficient hydrolysis of aluminum nitride in aluminum ash and the highly efficient removal of soluble impurities. The separation device not only realizes liquid-solid separation and uses the residual heat to dry the filter residue, but also separates the elemental aluminum metal that is difficult to extract from aluminum ash, greatly improving the utilization value of aluminum ash and reducing the costs of the ball milling process, water washing process, and liquid-solid separation of aluminum ash in general technologies, as well as the material transportation difficulties caused by the dispersion of devices.

[0016] Compared with the prior art, the beneficial effects of the present utility model are:

[0017] 1. The ball milling device for highly efficient water-washed aluminum ash is heated by a heating ring, and the water injection pipe realizes the control of the liquid-solid ratio of the hydrolysis reaction of aluminum ash, achieving the highly efficient hydrolysis of aluminum nitride in aluminum ash and the highly efficient removal of soluble impurities. The separation device not only realizes liquid-solid separation and uses the residual heat to dry the filter residue, but also separates the elemental aluminum metal that is difficult to extract from aluminum ash, greatly improving the utilization value of aluminum ash and reducing the costs of the ball milling process, water washing process, and liquid-solid separation of aluminum ash in general technologies, as well as the material transportation difficulties caused by the dispersion of devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0019] Figure 2 is a working process schematic diagram of the present utility model.

[0020] In the figure: 1. Main body mechanism; A. Reaction device; B. Separation device; C. Tail gas treatment device; 101. Ball milling device; 102. Heating ring; 103. Feed inlet; 104. Discharge outlet; 105. Rotatable insertion tube; 106. Exhaust pipe; 107. Water injection pipe; 108. Controllable draw plate; 109. Annular iron net; 110. Screen; 111. Suction filtration pipe; 112. Filter screen; 113. Suction filtration device; 114. Tail gas absorption device; 115. Water injection pipe valve; 116. Exhaust pipe valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Please refer to Figure 1 - Figure 2, the utility model provides a technical solution: a ball milling device for efficiently washing aluminum ash, including a main body mechanism 1. The main body mechanism 1 includes a reaction device A, a separation device B, and a tail gas treatment device C. The reaction device A includes a ball milling device 101. Inside the ball milling device 101, a heating ring 102 is fixedly arranged. At the left outer end of the ball milling device 101, a feed inlet 103 is fixedly arranged. At the lower right end of the ball milling device 101, a discharge outlet 104 is fixedly arranged. At the right side of the ball milling device 101, a rotatable insertion pipe 105 is movably arranged. At the right end of the rotatable insertion pipe 105, an exhaust pipe 106 is fixedly installed. Above the rotatable insertion pipe 105, a water injection pipe 107 is fixedly installed. At the discharge end of the ball milling device 101, a controllable extraction plate 108 is movably arranged. Below the controllable extraction plate 108, an annular iron net 109 is fixedly arranged. Below the annular iron net 109, a sieve mesh 110 is fixedly arranged.

[0023] Below the discharge outlet 104, a suction filtration pipe 111 is fixedly arranged. At the feed end of the suction filtration pipe 111, a filter screen 112 is fixedly arranged. Below the suction filtration pipe 111, a suction filtration device 113 is movably arranged. Below the exhaust pipe 106, a tail gas absorption device 114 is movably arranged. Above the rotatable insertion pipe 105, a water injection pipe valve 115 is movably arranged. At the right side of the rotatable insertion pipe 105, an exhaust pipe valve 116 is movably arranged. The rotatable insertion pipe 105 is connected to the water injection pipe 107 and the exhaust pipe 106, and both are provided with control valves. The size of the annular iron net 109 can be adjusted according to the grinding balls. The sieve pore size of the sieve mesh 110 is 170 - 200 mesh. The tail gas absorption device 114 contains boric acid solution and is heated by the heating ring 102. The water injection pipe 107 realizes the control of the liquid-solid ratio in the hydrolysis reaction of aluminum ash, achieving the efficient hydrolysis of aluminum nitride in the aluminum ash and the efficient removal of soluble impurities. The separation device B not only realizes the liquid-solid separation and uses the remaining heat to dry the filter residue, but also separates the metallic aluminum element that is difficult to extract from the aluminum ash, greatly improving the utilization value of the aluminum ash and reducing the costs of the aluminum ash ball milling process, the water washing process, and the liquid-solid separation in the general technology, as well as the material transportation difficulties caused by the dispersion of the devices.

[0024] Working principle: Fill the material, secondary aluminum ash, into the ball milling device 101. Open the water injection pipe valve 115 and inject water according to the liquid-solid ratio. At the same time, regulate the temperature through the heating ring 102 on the inner layer of the cavity wall of the ball milling device 101. After closing the water injection valve 115, drive the gravity impact of the grinding balls on the slurry by the rotation of the ball milling device 101 to break the aluminum hydroxide coating generated by the hydrolysis on the surface of aluminum nitride particles, so that aluminum nitride is fully hydrolyzed. During the ball milling process, open the exhaust valve 116 and discharge the ammonia gas generated by hydrolysis into the tail gas absorption device 114 through the exhaust pipe 106. A separation device B is provided outside the ball milling device 101. After the ball milling is completed, close the exhaust valve 116, open the controllable draw plate 108, connect the suction filtration device 113, block the grinding balls through the annular iron net 109, separate the metallic aluminum single particles through the screen 110, and the filter screen 112 of the suction filtration pipe realizes liquid-solid separation. The filter residue remains in the chamber of the separation device, and the filter residue, metallic aluminum single particles, grinding balls and the bottom of the ball milling device chamber are further rinsed through the rotatable insertion pipe 105. After the suction filtration is completed, maintain the internal temperature of the ball milling device, and dry the filter residue and metallic aluminum single particles at high temperature. Heat through the heating ring 102, and the water injection pipe 107 realizes the control of the liquid-solid ratio of the hydrolysis reaction of aluminum ash, achieving the efficient hydrolysis of aluminum nitride in aluminum ash and the efficient removal of soluble impurities. The separation device B not only realizes liquid-solid separation and uses the residual temperature to dry the filter residue, but also separates the metallic aluminum single particles that are difficult to extract in the aluminum ash, greatly improving the utilization value of aluminum ash and reducing the costs of the ball milling process, water washing process, liquid-solid separation in the general technology and the material transportation difficulties caused by the dispersion of devices.

[0025] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than a limitation on the protection scope of the present invention. Any simple modification or equivalent replacement made by those of ordinary skill in the art to the technical solution of the present invention does not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A ball milling device for high-efficiency water-washing aluminum ash, comprising a main body (1), characterized in that: The main structure (1) comprises a reaction device (A), a separation device (B) and an exhaust gas treatment device (C); the reaction device (A) comprises a ball mill (101); a heating ring (102) is fixedly arranged on the inner side of the ball mill (101); a feed port (103) is fixedly arranged on the left outer end of the ball mill (101); a discharge port (104) is fixedly arranged on the right lower end of the ball mill (101); a rotatable insert (105) is movably arranged on the right side of the ball mill (101); an exhaust pipe (106) is fixedly installed on the right end of the rotatable insert (105); and a water injection pipe (107) is fixedly installed above the rotatable insert (105).

2. The ball milling device for high-efficiency water-washed aluminum ash according to claim 1 is characterized in that: A controllable draw plate (108) is movably provided at the discharge end of the ball mill (101), an annular iron net (109) is fixedly provided below the controllable draw plate (108), and a screen (110) is fixedly provided below the annular iron net (109).

3. The ball milling device for high-efficiency water-washed aluminum ash according to claim 2 is characterized in that: A suction filter tube (111) is fixedly arranged below the discharge port (104), a filter screen (112) is fixedly arranged at the feed end of the suction filter tube (111), and a suction filter device (113) is movably arranged below the suction filter tube (111).

4. The ball milling device for high-efficiency water-washed aluminum ash according to claim 3 is characterized by: A tail gas absorption device (114) is movably provided below the exhaust pipe (106), a water injection pipe valve (115) is movably provided above the rotatable insert pipe (105), and an exhaust pipe valve (116) is movably provided on the right side of the rotatable insert pipe (105).

5. The ball milling device for high-efficiency water-washed aluminum ash according to claim 4 is characterized in that: The rotatable insert pipe (105) is connected to the water injection pipe (107) and the exhaust pipe (106), and both are provided with control valves.

6. The ball milling device for high-efficiency water-washed aluminum ash according to claim 5 is characterized by: The size of the annular iron mesh (109) can be adjusted according to the grinding balls, and the mesh size of the screen (110) is 170-200 meshes.

7. The ball milling device for high-efficiency water-washed aluminum ash according to claim 6 is characterized by: The tail gas absorption device (114) contains boric acid liquid.

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