High-value utilization system for all components of secondary aluminum ash

Abstract

The utility model discloses an all-component high-value utilization system for secondary aluminum ash. The all-component high-value utilization system comprises a mixing device, a roasting furnace and a flue gas purification device, wherein the roasting furnace comprises a rotary furnace body and a flue gas conveying pipe; the rotary furnace body comprises a furnace body, a feeding furnace end piece and a discharging furnace end piece, the upper portion of the discharging furnace end piece is communicated with a smoke conveying pipe, and the other end of the smoke conveying pipe penetrates through the feeding furnace end piece and extends into the furnace body by a certain distance. According to the rotary roasting device, the heating roasting procedure can be efficiently completed through rotary roasting, and meanwhile raw materials to be roasted can be preheated through tail gas in the tail gas secondary utilization device. According to the specific structure, the preheating section is provided with the inner fixing pipe, so that the internal size of the preheating section can be effectively reduced, the preheating efficiency is improved, solid components in tail gas can be effectively removed through the simple dust removal device on the tail gas flowing pipe, and treatment of the follow-up process is facilitated.

Description

Technical Field

[0001] This utility model relates to the technical field of solid waste treatment equipment, specifically a high-value utilization system for all components of secondary aluminum ash, specifically a roasting furnace with secondary utilization of exhaust gas. Background Technology

[0002] Secondary aluminum ash is a byproduct generated during the recycling and recasting of aluminum products. Its main components include metallic aluminum, aluminum oxides, aluminum nitride, chlorides, and fluorides, with the metallic aluminum content typically ranging from 10% to 20%. Secondary aluminum ash contains toxic and harmful substances such as fluorides, cyanides, aluminum carbide, and aluminum nitride. These substances react with water to produce gases such as NH3 and CH4, which not only have a foul odor but also have the potential to cause explosions. The leaching of fluorides and cyanides can also pollute natural water bodies. The treatment and resource utilization of secondary aluminum ash is not only necessary for environmental protection but also an important component of resource conservation and the circular economy. Through appropriate technological treatment, the environmental impact of secondary aluminum ash can be reduced, while simultaneously achieving waste resource recovery and promoting sustainable development.

[0003] Extracting aluminum from secondary aluminum ash through acid or alkali leaching is a common secondary aluminum ash treatment process. However, acid or alkali leaching generates large amounts of wastewater, which can cause environmental pollution if not properly treated. Patent CN112744850B discloses a method for comprehensive utilization of secondary aluminum ash resources, which involves a high-temperature roasting process. This process recovers alumina from aluminum ash through a pyrometallurgical method and converts the alumina into sodium aluminate clinker. The sodium aluminate clinker can be sold directly or used to manufacture alumina. The salts condensed and crystallized in the roasting exhaust gas can also be used to prepare slagging agents. This invention features easy process control, stable industrial production, high product added value, and zero waste discharge, achieving the resource utilization of aluminum ash. However, this patent only relates to the preparation process and does not cover the specific preparation equipment. Utility Model Content

[0004] The purpose of this invention is to provide a high-value utilization system for all components of secondary aluminum ash, in order to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides a high-value utilization system for all components of secondary aluminum ash, including a mixing device, a roasting furnace, and a flue gas purification device. The roasting furnace includes a rotary furnace body and a flue gas conveying pipe. The rotary furnace body includes a furnace body, a feeding furnace end piece, and a discharging furnace end piece. A flue gas conveying pipe is connected to the upper part of the discharging furnace end piece, and the other end of the flue gas conveying pipe passes through the feeding furnace end piece and extends a certain distance into the furnace body.

[0006] Furthermore, the furnace body is placed on a support bracket via a slewing support wheel assembly, and a drive gear is fixedly installed on the furnace body. The drive gear is driven by a drive motor assembly, which includes a motor, a reduction gearbox, and a drive gear.

[0007] Furthermore, the lower part of the discharge furnace end piece is provided with an openable and closable discharge port, and one side of the feeding furnace end piece is provided with an openable and closable feeding conveying pipe. An exhaust pipe is provided at the upper part of the feeding furnace end piece. The conveying pipe is connected to a mixing device, and the exhaust pipe is connected to a flue gas purification device.

[0008] Furthermore, a dust collector is provided on the flue gas conveying pipe and / or exhaust pipe. The dust collector includes an outer inverted trapezoidal cylinder, an upper hemispherical cap, and a downward-sloping ring. The outer inverted trapezoidal cylinder is a hollow inverted trapezoidal structure, with an air outlet pipe and an air inlet pipe on the top and bottom surfaces. A downward-sloping ring is provided inside the outer inverted trapezoidal cylinder. The downward-sloping ring is annular, with its outer side fixed to the inner wall of the outer inverted trapezoidal cylinder and its inner side inclined downward. A through hole is formed in the center, and an upper hemispherical cap is provided above the through hole. The upper hemispherical cap is a hemispherical thin-walled structure, and its bottom is fixed to the downward-sloping ring by a support rod.

[0009] Furthermore, the bottom diameter of the upper hemispherical cap is larger than the diameter of the internal through hole of the downward tilting ring, and the bottom height of the upper hemispherical cap is lower than the outer height of the downward tilting ring fixed to the inner wall of the outer inverted trapezoidal cylinder.

[0010] Furthermore, the side of the rotary kiln body closest to the feed furnace end is a preheating section, the length of which accounts for 1 / 4 to 1 / 3 of the total length of the rotary kiln body.

[0011] Furthermore, an inner fixed pipe is provided in the preheating section area, and the flue gas conveying pipe extends below the inner fixed pipe after passing through the feed furnace end piece.

[0012] Furthermore, the sidewall of the flue gas conveying pipe in the preheating section is provided with multiple through holes that are distributed in an array and inclined toward the feed furnace end piece.

[0013] Furthermore, the outer diameter of the inner fixed tube gradually increases as it moves further away from the feed furnace end piece, and the corresponding flue gas conveying pipe in the preheating section is arranged inclined downwards.

[0014] This invention provides a high-value utilization system for all components of secondary aluminum ash, specifically a roasting furnace with secondary exhaust gas utilization. Rotary roasting efficiently completes the heating and roasting process, while the exhaust gas can be used to preheat the raw materials to be roasted via the exhaust gas secondary utilization device. Structurally, the preheating section incorporates an internal fixed tube, effectively reducing its internal volume and improving preheating efficiency. A simple dust removal device on the exhaust gas flow pipe effectively removes solid components from the exhaust gas, facilitating subsequent processing. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0016] Figure 2 This is a cross-sectional schematic diagram of the overall scheme of this utility model.

[0017] Figure 3 This is a schematic cross-sectional view of the dust collector cylinder of this utility model.

[0018] Figure 4 This is a cross-sectional schematic diagram of another embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of the system solution of this utility model. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] As attached Figure 1-5 As shown, the secondary aluminum ash full-component high-value utilization system involved in this utility model includes a mixing device b1, a calcining furnace b2, and a flue gas purification device b3.

[0022] As attached Figure 1 , 2 As shown, the roasting furnace b2 includes a rotary furnace body 1 and a flue gas conveying pipe 2. The rotary furnace body 1 includes a furnace body 10, a feeding furnace end component 11, and a discharging furnace end component 12. The furnace body 10 is placed on a support bracket (not shown in the figure) via a rotary support wheel assembly 101. A drive gear 102 is fixedly installed on the furnace body 10, and the rotation of the furnace body 10 is achieved by the drive motor assembly 103, wherein the drive motor assembly 103 includes a motor, a reduction gearbox, and a drive gear.

[0023] The feeding furnace end piece 11 and the discharging furnace end piece 12 are located on both sides of the furnace body 10 and are rotatably and sealedly connected to the furnace body 10.

[0024] In addition, the furnace body 1 is equipped with necessary insulation structures. The specific connection structure between the feeding furnace end component 11, the discharging furnace end component 12, the insulation structure and the furnace body 1 is a conventional structure in the field.

[0025] The lower part of the discharge furnace end piece 12 is provided with an openable discharge port, and the upper part of the discharge furnace end piece 12 is connected to a flue gas conveying pipe 2. The other end of the flue gas conveying pipe 2 passes through the feed furnace end piece 11 and extends into the furnace body 10 at a certain distance.

[0026] An openable feed conveying pipe 111 is provided on one side of the feed furnace end component 11, and an exhaust pipe 112 is provided on the upper part of the feed furnace end component 11. The conveying pipe 111 is connected to the mixing device b1.

[0027] A dust collector 3 is provided on the flue gas conveying pipe 2 and / or the tail gas pipe 112, with attachment Figure 1 Only in flue gas conveying pipe 2, attached Figure 4 Dust collectors 3 are installed in both the flue gas conveying pipe 2 and the tail gas pipe 112.

[0028] As attached Figure 3 As shown, the dust collector 3 includes an outer inverted trapezoidal cylinder 31, an upper hemispherical cap 32, and a downward tilting ring 33. The outer inverted trapezoidal cylinder 31 is an inverted trapezoidal structure with an internally hollow structure. An air outlet pipe and an air inlet pipe are provided on the top and bottom surfaces.

[0029] A downward tilting ring 33 is provided inside the outer inverted trapezoidal cylinder 31. The downward tilting ring 33 is annular, with its outer side fixed to the inner wall of the outer inverted trapezoidal cylinder 31 and its inner side tilting downward. A through hole is formed in the center. An upper hemispherical cap 32 is provided above the through hole. The upper hemispherical cap 32 has a hemispherical thin-walled structure. Its bottom is fixed to the downward tilting ring 33 by a support rod 34. The bottom diameter of the upper hemispherical cap 32 is larger than the diameter of the through hole inside the downward tilting ring 33, and the bottom height of the upper hemispherical cap 32 is lower than the height of the outer side of the downward tilting ring 33 fixed to the inner wall of the outer inverted trapezoidal cylinder 31.

[0030] The rotary kiln body 1 has a preheating section 1a on the side near the feeding furnace end piece 11. The length of the preheating section accounts for 1 / 4 to 1 / 3 of the total length of the rotary kiln body 1. An inner fixed pipe 113 is provided in the preheating section 1a area. After the flue gas conveying pipe 2 passes through the feeding furnace end piece 11, it extends to the bottom of the inner fixed pipe 113. Multiple through holes 21 are provided on the side wall of the flue gas conveying pipe 2 located in the preheating section 1a, which are arranged in an array and inclined towards the feeding furnace end piece 11, so that the flue gas blown out from them points towards the feeding furnace end piece 11 and is opposite to the direction of movement of the roasting raw materials.

[0031] Furthermore, as shown in the attached document. Figure 4 As shown, the outer diameter of the inner fixed tube 113 gradually increases as it moves away from the feed furnace end piece 11. Correspondingly, the flue gas conveying pipe 2 located in the preheating section 1a is arranged inclined downwards, so that the flue gas blown out from the flue gas conveying pipe 2 moves towards the feed furnace end piece 11 and finally flows to the flue gas purification device b3 through the tail gas pipe 112.

[0032] The mixing device b1 and the flue gas purification device b3 are commercially available products, and their specific structures are not protected by this application.

[0033] It should be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A system for the high-value utilization of all components of secondary aluminum ash, comprising a mixing device, a calcining furnace, and a flue gas purification device, characterized in that... The roasting furnace includes a rotary furnace body and a flue gas conveying pipe; the rotary furnace body includes a furnace body, a feeding furnace end piece, and a discharging furnace end piece, with a flue gas conveying pipe connected to the upper part of the discharging furnace end piece, and the other end of the flue gas conveying pipe passing through the feeding furnace end piece and extending a certain distance into the furnace body.

2. The secondary aluminum ash full-component high-value utilization system according to claim 1, characterized in that, The furnace body is placed on a support frame via a slewing support wheel assembly. A drive gear is fixedly installed on the furnace body and driven by a drive motor assembly, which includes a motor, a gearbox, and a drive gear.

3. The secondary aluminum ash full-component high-value utilization system according to claim 1, characterized in that, The lower part of the discharge furnace end piece is provided with an openable discharge port, the side of the feed furnace end piece is provided with an openable feed conveying pipe, the upper part of the feed furnace end piece is provided with a tail gas pipe, the conveying pipe is connected to the mixing device, and the tail gas pipe is connected to the flue gas purification device.

4. The secondary aluminum ash full-component high-value utilization system according to claim 1, characterized in that, A dust collector is installed on the flue gas conveying pipe and / or exhaust pipe. The dust collector includes an outer inverted trapezoidal cylinder, an upper hemispherical cap, and a downward-sloping ring. The outer inverted trapezoidal cylinder is a hollow inverted trapezoidal structure with an air outlet pipe and an air inlet pipe on the top and bottom surfaces. A downward-sloping ring is installed inside the outer inverted trapezoidal cylinder. The downward-sloping ring is annular, with its outer side fixed to the inner wall of the outer inverted trapezoidal cylinder and its inner side inclined downward. A through hole is formed in the center. An upper hemispherical cap is installed above the through hole. The upper hemispherical cap is a hemispherical thin-walled structure, and its bottom is fixed to the downward-sloping ring by a support rod.

5. The secondary aluminum ash full-component high-value utilization system according to claim 4, characterized in that, The bottom diameter of the upper hemispherical cap is larger than the diameter of the internal through hole of the downward tilting ring, and the bottom height of the upper hemispherical cap is lower than the outer height of the downward tilting ring and the inner wall of the outer inverted trapezoidal cylinder.

6. The secondary aluminum ash full-component high-value utilization system according to claim 1, characterized in that, The preheating section is located on the side of the rotary kiln body closest to the feeding furnace end, and the length of the preheating section accounts for 1 / 4 to 1 / 3 of the total length of the rotary kiln body.

7. The secondary aluminum ash full-component high-value utilization system according to claim 6, characterized in that, An inner fixed pipe is installed in the preheating section area. The flue gas conveying pipe extends below the inner fixed pipe after passing through the feed furnace end piece.

8. The secondary aluminum ash full-component high-value utilization system according to claim 7, characterized in that, Multiple through holes, arranged in an array and inclined toward the feed furnace end, are provided on the side wall of the flue gas conveying pipe located in the preheating section.

9. The secondary aluminum ash full-component high-value utilization system according to claim 7, characterized in that, The outer diameter of the inner fixed tube gradually increases as it moves away from the feed furnace end, and the corresponding flue gas conveying pipe in the preheating section is arranged inclined downwards.

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