Device for roasting high-fluorine aluminum ash to solidify fluoride

Abstract

The utility model discloses a device for roasting and solidifying fluoride through high-fluorine aluminum ash. The device comprises a furnace body, a cyclone separator and a secondary feeding assembly. The furnace body is divided into a plurality of furnace cavities through vertical partition plates in the horizontal direction, gaps are formed between the vertical partition plates and the top face or the bottom face of the inner wall of the furnace body, and the adjacent vertical partition plates are arranged in a staggered mode in the vertical direction, so that the furnace cavities are communicated with one another. A tail gas pipe of the furnace body is communicated with a gas inlet pipe of the cyclone separator; and the secondary feeding pipe is communicated with a solid material outlet of the cyclone separator, and the other end of the secondary feeding pipe is communicated with the furnace body. Through the design of the hearth, the size of the hearth can be enlarged within the limited height, in addition, the granular material circulating device between the hearths can effectively improve the aluminum ash treatment efficiency, and the overall energy consumption of the furnace body is reduced. According to the specific structure, through the arrangement of the third furnace chamber striker plate and the cyclone separator, the content of particles in tail gas can be effectively reduced, and meanwhile the particles can be conveyed to the combustion chamber in time to be combusted again.

Description

Technical Field

[0001] This utility model relates to the technical field of solid waste treatment equipment, specifically to a device for calcining and curing fluorides from high-fluorine aluminum ash. Background Technology

[0002] High-fluorine aluminum ash refers to aluminum ash with a fluorine content exceeding a specific standard threshold. Fluorine primarily originates from the aluminum smelting process, where fluorine-containing substances are introduced as flux to lower the melting point of alumina. Because fluorine is a potentially harmful element to the environment and human health, the treatment and resource utilization of high-fluorine aluminum ash are particularly complex.

[0003] Treatment methods for high-fluoride aluminum ash mainly include wet leaching, pyrometallurgical gasification, and combined acid-base processes. Wet leaching primarily uses chemical reactions to dissolve fluorides in the high-fluoride aluminum ash into water or other solvents, thus separating the fluoride. However, this method often generates large amounts of wastewater, which can cause secondary pollution if not properly treated. The commonly used pyrometallurgical gasification process converts fluorides into a gaseous state at high temperatures, then solidifies them through condensation. This method effectively reduces wastewater generation but has high energy consumption. The combined acid-base process combines the advantages of both wet and pyrometallurgical methods. It first converts fluorides into soluble salts through an acid-base reaction, then solidifies them through calcination. This method offers advantages such as low cost, high efficiency, and environmental friendliness.

[0004] In the calcination and curing process, aluminum ash is generally mixed with a preparation (fluorine-fixing agent) and then calcined at high temperature. In order to improve the curing effect on fluorides, the mixture is thoroughly ball-milled. For example, in a method for simultaneous denitrification and fluorine fixation of secondary aluminum ash disclosed in patent CN114054476A, when the mixture after thorough grinding and pulverization is calcined at high temperature, the mixture is prone to drift away with the flue gas generated by combustion, reducing the processing efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a device for calcining and curing fluorides from high-fluorine aluminum ash, so as to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides a device for calcining and curing fluorides from high-fluorine aluminum ash, comprising a furnace body, wherein the furnace body is provided with a feeding pipe and a tail gas pipe, and further includes a cyclone separator and a secondary feeding assembly; the furnace body is divided into multiple furnace chambers in the horizontal direction by vertical partitions, the vertical partitions having gaps with the top or bottom surface of the inner wall of the furnace body, and adjacent vertical partitions being staggered in the vertical direction, so that the multiple furnace chambers are interconnected; the tail gas pipe of the furnace body is connected to the inlet pipe of the cyclone separator; the solid material outlet of the cyclone separator is connected to the secondary feeding assembly, the secondary feeding assembly including a secondary feeding pipe, the secondary feeding pipe being connected to the solid material outlet of the cyclone separator, and the other end being connected to the furnace body.

[0007] Furthermore, the furnace body is characterized by having two vertical partitions that divide the interior of the furnace body into three spaces, which are designated as the first furnace chamber, the second furnace chamber, and the third furnace chamber according to their distance from the feeding pipe. The upper part of the vertical partition closest to the feeding pipe of the furnace body has a gap with the top surface of the inner wall of the furnace body 1, and the other vertical partition is fixed to the top surface of the inner wall of the furnace body and has a gap with the bottom surface of the inner wall of the furnace body.

[0008] Furthermore, the lowest point of the second and third furnace chambers is higher than that of the first furnace chamber, and the bottom of the second and third furnace chambers is connected to the secondary feeding pipe.

[0009] Furthermore, several baffles are provided in the upper part of the third furnace cavity. The baffles are arranged obliquely in the third furnace cavity, with their two sides connected to the inner wall of the furnace. The lower end is provided with a gap to the vertical partition or the inner wall of the furnace. Adjacent baffles are arranged opposite each other and have opposite inclination directions.

[0010] Furthermore, the secondary feeding assembly also includes an air supply device, which is located at the end of the secondary feeding pipe away from the first furnace chamber.

[0011] Furthermore, the secondary feeding assembly also includes an air supply device and an anti-backflow unit.

[0012] Furthermore, the air supply device is a vortex fan.

[0013] Furthermore, the air supply device is an air amplifier, and the air outlet of the air amplifier is connected to the end of the secondary feeding pipe.

[0014] Furthermore, the secondary feeding assembly also includes an anti-backflow unit; the anti-backflow unit is an irregularly shaped bend connected to the secondary feeding pipe, the anti-backflow unit includes a guide section and a turning section, wherein the guide section is a straight pipe arranged inclined upward, the lower end of which is connected to the secondary feeding pipe, and the angle between its axis and the axis of the secondary feeding pipe is α, and the higher end is away from the first furnace cavity, the higher end of the guide section is connected to the turning section 2, the turning section is a bend, and the other end is connected to the secondary feeding pipe, the turning angle β of the turning section is less than (90°-α).

[0015] This invention provides a device for calcining and curing fluorides from high-fluorine aluminum ash, specifically a calcination furnace. The furnace chamber design allows for increased volume within a limited space (height). Furthermore, the inter-chamber particle circulation device effectively improves aluminum ash processing efficiency and reduces overall furnace energy consumption. In terms of structure, the inclusion of a third furnace chamber baffle and cyclone separator effectively reduces the particle content in the exhaust gas while promptly transporting the particles to the combustion chamber for re-combustion. For the secondary feeding pipe, the use of a pneumatic conveying device or anti-backflow structure effectively reduces the direct escape of flames and high-temperature flue gas through the secondary feeding pipe. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0017] Figure 2 This is a cross-sectional schematic diagram of the overall scheme of this utility model.

[0018] Figure 3 This is a cross-sectional schematic diagram of another embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of an anti-backflow unit in another embodiment of the present invention. 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 1-4 As shown, the device for calcining and curing fluorides from high-fluorine aluminum ash involved in this utility model includes a furnace body 1, a cyclone separator 2, and a secondary feeding assembly 3.

[0022] As attached Figure 1-2 As shown, the furnace body 1 is divided into multiple furnace chambers in the horizontal direction by vertical partitions 10. The vertical partitions are separated from the top or bottom surface of the inner wall of the furnace body 1 by gaps, and the adjacent vertical partitions are staggered in the vertical direction, so that the multiple furnace chambers are interconnected.

[0023] The furnace body 1 is equipped with a feeding pipe 11 and a tail gas pipe 12.

[0024] The tail gas pipe 12 of the furnace body 1 is connected to the air inlet pipe of the cyclone separator 2.

[0025] The solid material outlet of the cyclone separator 2 is connected to the secondary feeding assembly 3. The secondary feeding assembly 3 includes a secondary feeding pipe 31, which is connected to the solid material outlet of the cyclone separator 2 and to the furnace body 1 at the other end. Specifically, it is connected to the combustion chamber of the furnace body 1.

[0026] The combustion chamber is located below the feed pipe 11 of the furnace body 1. The combustion chamber is also equipped with an air supply structure. The specific structure is conventional knowledge in the field and is not within the scope of protection of this application.

[0027] Regarding the specific structure of furnace body 1, see attached... Figure 2 As shown, this application provides an embodiment including three furnace chambers.

[0028] The furnace body 1 is provided with two vertical partitions 10, which divide the interior of the furnace body 1 into three spaces, which are named the first furnace chamber 131, the second furnace chamber 132, and the third furnace chamber 133 according to their distance from the feeding pipe. The upper part of the vertical partition 10 near the feeding pipe 11 of the furnace body 1 has a gap with the top surface of the inner wall of the furnace body 1, and its side is connected to the side surface of the inner wall of the furnace body 1. The other vertical partition 10 is fixed to the top surface of the inner wall of the furnace body 1, has a gap with the bottom surface of the inner wall of the furnace body 1, and its side is connected to the side surface of the inner wall of the furnace body 1.

[0029] Furthermore, the lowest point of the second furnace chamber 132 and the third furnace chamber 133 is higher than that of the first furnace chamber 131. The bottom of the second furnace chamber 132 and the third furnace chamber 133 are connected to the secondary feeding pipe 31.

[0030] Furthermore, a plurality of baffle plates 14 are provided on the upper part of the third furnace chamber 133. The baffle plates 14 are inclinedly arranged within the third furnace chamber 133, with their two sides connected to the inner wall of the furnace body 1, and the lower end having a gap with the vertical partition 10 or the inner wall of the furnace body 1. Adjacent baffle plates 14 are arranged opposite each other and in opposite directions of inclination. (See attached image) Figure 2 Two baffles 14 are installed in the middle, which can effectively reduce the amount of particulate matter entering the cyclone separator with the flue gas.

[0031] During roasting, the mixture and flue gas will form an up-down-up movement path within the furnace body 1 under the restriction of the vertical baffle 10. In the first furnace chamber 131, a large number of particles will move with the flue gas to the second furnace chamber 132 and the third furnace chamber 133. Under the action of the baffle 14 in the third furnace chamber 133, most of the particles will fall to the bottom of the second furnace chamber 132 and the third furnace chamber 133 and flow back to the first furnace chamber 131 through the secondary feeding pipe 31. Similarly, the particles separated by the cyclone separator will also flow back to the first furnace chamber 131 for re-roasting.

[0032] As attached Figure 3As shown, to prevent the high-temperature medium in the first furnace chamber 131 from flowing directly to the second furnace chamber 132, the third furnace chamber 133, and the cyclone separator 2 during the recirculation of particulate matter through the secondary feeding pipe 31, in one embodiment, the applicant provides a vortex fan 32 at the end of the secondary feeding pipe 31 away from the first furnace chamber 131 to prevent the high-temperature medium from escaping by blowing air inward. Since the presence of particulate matter may adversely affect commonly used fans, in one embodiment of this application, an air amplifier is used instead of a fan. The air outlet of the air amplifier is connected to the end of the secondary feeding pipe 31, and a small amount of compressed air is used as a power source to drive the surrounding air to form a high-pressure, high-speed airflow that is blown into the secondary feeding pipe 31.

[0033] As attached Figure 4 As shown, in another embodiment of the present applicant, a plurality of anti-backflow units 33 are provided on the secondary feeding pipe 31. The anti-backflow unit 33 is an irregularly shaped bend connected to the secondary feeding pipe 31. Specifically, the anti-backflow unit 33 includes a guide section 331 and a turning section 332. The guide section 331 is a straight pipe arranged inclined upward. The lower end is connected to the secondary feeding pipe 31, and the angle between its axis and the axis of the secondary feeding pipe 31 is α. The higher end is away from the first furnace cavity 131. The higher end of the guide section 331 is connected to the turning section 332. The turning section 332 is a bend, and the other end is connected to the secondary feeding pipe 31. The bending angle β of the turning section 332 (the angle between the axes of the two ends of the turning section 332) is less than (90°-α). When the high-temperature medium escaping from the secondary feed pipe 31 encounters the anti-backflow unit 33, a portion of it will be deflected through the guide section 331 and the turning section 332 and flow back into the secondary feed pipe 31, colliding with the high-temperature medium inside the secondary feed pipe 31, reducing the amount that continues to escape, while having little impact on the granular material flowing from top to bottom.

[0034] 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 device for calcining and curing fluorides from high-fluorine aluminum ash, comprising a furnace body, wherein the furnace body is provided with a feeding pipe and a tail gas pipe, characterized in that, It also includes a cyclone separator and a secondary feeding assembly; the furnace body is divided into multiple furnace chambers in the horizontal direction by vertical partitions, and the vertical partitions are separated from the top or bottom surface of the inner wall of the furnace body by gaps, and adjacent vertical partitions are staggered in the vertical direction so that the multiple furnace chambers are interconnected; the tail gas pipe of the furnace body is connected to the air inlet pipe of the cyclone separator; the solid material outlet of the cyclone separator is connected to the secondary feeding assembly, and the secondary feeding assembly includes a secondary feeding pipe, which is connected to the solid material outlet of the cyclone separator and connected to the furnace body at the other end.

2. The apparatus for calcining and curing fluorides from high-fluorine aluminum ash according to claim 1, characterized in that, The furnace body is provided with two vertical partitions, which divide the furnace body into three spaces. According to their distance from the feeding pipe, they are the first furnace chamber, the second furnace chamber, and the third furnace chamber. The upper part of the vertical partition near the feeding pipe of the furnace body has a gap with the top surface of the inner wall of the furnace body (1). The other vertical partition is fixed on the top surface of the inner wall of the furnace body and has a gap with the bottom surface of the inner wall of the furnace body.

3. The apparatus for calcining and curing fluorides from high-fluorine aluminum ash according to claim 2, characterized in that, The lowest point of the second and third furnace chambers is higher than that of the first furnace chamber, and the bottom of the second and third furnace chambers is connected to the secondary feeding pipe.

4. The apparatus for calcining and curing fluorides from high-fluorine aluminum ash according to claim 3, characterized in that, Several baffles are provided in the upper part of the third furnace cavity. The baffles are arranged obliquely in the third furnace cavity. The two sides are connected to the inner wall of the furnace body (1). The lower end is provided with a gap with the vertical partition or the inner wall of the furnace body. Adjacent baffles (14) are arranged opposite each other and have opposite inclination directions.

5. The apparatus for calcining and curing fluorides from high-fluorine aluminum ash according to claim 1, characterized in that, The secondary feeding assembly also includes an air supply device, which is located at the end of the secondary feeding pipe away from the first furnace chamber.

6. The apparatus for calcining and curing fluorides from high-fluorine aluminum ash according to claim 1, characterized in that, The secondary feeding assembly also includes an air supply device and an anti-backflow unit.

7. The apparatus for calcining and curing fluorides from high-fluorine aluminum ash according to any one of claims 5 or 6, characterized in that, The air supply device is a vortex fan.

8. The apparatus for calcining and curing fluorides from high-fluorine aluminum ash according to any one of claims 5 or 6, characterized in that, The air supply device is an air amplifier, and the air outlet of the air amplifier is connected to the end of the secondary feeding pipe.

9. The apparatus for calcining and curing fluorides from high-fluorine aluminum ash according to any one of claims 5 or 6, characterized in that, The secondary feeding assembly also includes an anti-backflow unit; the anti-backflow unit is an irregularly shaped bend connected to the secondary feeding pipe. The anti-backflow unit includes a guide section and a turning section. The guide section is a straight pipe arranged at an upward inclination. The lower end is connected to the secondary feeding pipe, and its axis is at an angle α with the axis of the secondary feeding pipe. The higher end is away from the first furnace cavity. The higher end of the guide section is connected to the turning section (332). The turning section is a bend, and the other end is connected to the secondary feeding pipe. The turning angle β of the turning section is less than (90°-α).

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