WO2024093146A1

WO2024093146A1 - Aluminum electrolysis overhaul slag treatment system

Info

Publication number: WO2024093146A1
Application number: PCT/CN2023/087609
Authority: WO
Inventors: 王珣; 杜婷婷; 陈开斌; 刘建军; 罗英涛; 孙丽贞; 刘彤; 罗钟生; 荆全海; 王莹玮
Original assignee: 中铝郑州有色金属研究院有限公司
Priority date: 2022-11-04
Filing date: 2023-04-11
Publication date: 2024-05-10
Also published as: CN115739946A

Abstract

The present disclosure relates to the technical field of aluminum electrolysis overhaul slag treatment, in particular to an aluminum electrolysis overhaul slag treatment system, comprising a preparation assembly (110) used for treating overhaul slag to form slurry; a pipe link apparatus (120), a first inlet (121) of the pipe link apparatus (120) being connected to the preparation assembly (110), and the pipe link apparatus (120) comprising a plurality of connection pipes (123) and elbows (124), wherein one elbow (124) is arranged between every two adjacent connection pipes (123), and the pipe link apparatus is used for uniformly mixing the slurry; a stay link apparatus (130), a second inlet (132) of the stay link apparatus (130) being connected to a first outlet (127) of the pipe link apparatus (120), and the stay link apparatus (130) being used for fully reacting the slurry to dissolve fluoride and/or cyanide, so as to form substances to be discharged; and a processing link apparatus (150), connected to a second outlet (133) of the stay link apparatus (130) and used for processing and discharging the substances to be discharged. A dissolution reaction and the subsequent treatment of the substances to be discharged are continuous and uninterrupted, so as to avoid fluoride and cyanide release during the intermediate process, thereby allowing the reaction to be more sufficient and improving the processing efficiency.

Description

Aluminum electrolysis overhaul slag treatment system

CROSS-REFERENCE TO RELATED APPLICATIONS

This disclosure claims priority to Chinese patent application No. 202211380499.4 filed on November 4, 2022, the entire contents of which are incorporated herein by reference.

Technical Field

The present disclosure relates to the technical field of treating aluminum electrolysis overhaul slag, and more specifically, to an aluminum electrolysis overhaul slag disposal system.

Background technique

The electrolytic cell is a key production equipment in the electrolytic aluminum industry. All electrolytic aluminum production around the world uses the electrolytic cell electrolysis process to produce electrolytic aluminum. Overhaul slag is an inevitable solid hazardous waste in the aluminum electrolytic production process. It was included in the "National List of Hazardous Wastes" in 2016. The "National List of Hazardous Wastes" in 2021 further accurately describes the overhaul slag. China is the world's largest producer of electrolytic aluminum, with an electrolytic aluminum output of 38.5 million tons in 2021, accounting for about 57% of the global total. The cell age of an aluminum electrolytic cell is generally 6-8 years, and the maintenance process during this period will produce a large amount of solid waste slag. About 20kg of overhaul slag is produced for every ton of aluminum produced. Considering the decades of backlog and the still increasing production of primary aluminum, the amount of overhaul slag is very large. Its main toxic substances are soluble fluorides and cyanides, which are extremely harmful to environmental factors such as soil, water and atmosphere. To this end, it is necessary to dispose of the fluorides and cyanides in the overhaul slag to ensure the safe discharge and reuse of the overhaul slag.

At present, there are two main methods for the disposal and utilization of overhaul slag: pyrometallurgy and hydrometallurgy. The pyrometallurgy process requires a larger investment than the hydrometallurgy process. The hydrometallurgy process is more mature and has more industrial applications. However, the dissolution process of toxic substances in the hydrometallurgy process is discontinuous, and the dissolution at room temperature is limited in applicability for areas with large temperature changes throughout the year. In addition, the process conditions such as temperature and pressure of the dissolution process in the hydrometallurgy process cannot be effectively controlled and kept stable, and the dissolution efficiency is low.

Therefore, it is necessary to propose an aluminum electrolysis overhaul slag disposal system to at least partially solve the problems existing in the prior art.

Summary of the invention

The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention of the present disclosure is not intended to limit the key features and Necessary technical features do not mean an attempt to determine the scope of protection of the technical solution claimed.

In order to solve at least one of the technical problems existing in the prior art or related technology, the present disclosure provides an aluminum electrolysis overhaul slag disposal system.

According to the present disclosure, an aluminum electrolysis overhaul slag disposal system includes: a preparation component, which is used to process the overhaul slag to form a slurry; a tubular segment equipment, wherein the first inlet of the tubular segment equipment is connected to the preparation component, and the tubular segment equipment includes: a plurality of connecting pipes and elbows, wherein one elbow is arranged between each two adjacent connecting pipes, and the tubular segment is used to mix the slurry evenly; a stay segment equipment, wherein the second inlet of the stay segment equipment is connected to the first outlet of the tubular segment equipment, and the stay segment equipment is used to make the slurry fully react to dissolve fluoride and/or cyanide, thereby forming a to-be-discharged substance; a processing segment equipment, which is connected to the second outlet of the stay segment equipment and is used to process and discharge the to-be-discharged substance.

The aluminum electrolysis overhaul slag disposal system disclosed in the present invention, and other advantages, objectives and features of the present invention will be reflected in part through the following description, and will also be understood by technicians in this field through research and practice of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present specification. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

FIG1 is a schematic structural diagram of an aluminum electrolysis overhaul slag disposal system according to an embodiment of the present disclosure;

FIG2 is a schematic structural diagram of a tubular segment device from one perspective provided by an embodiment of the present disclosure;

FIG3 is a schematic structural diagram of a tubular segment device provided by an embodiment of the present disclosure from another perspective;

FIG4 is a schematic structural diagram of a stop link device provided in an embodiment of the present disclosure;

FIG5 is a schematic structural diagram of a sedimentation device provided in an embodiment of the present disclosure.

The corresponding relationship between the reference numerals and component names in FIGS. 1 to 5 is as follows:
110 preparation assembly, 120 tubular segment equipment, 121 first inlet, 122 tubular layer, 123 connecting pipe, 1231
The first tube body, 1232 the second tube body, 124 the elbow, 125 the first temperature detection port, 126 the first pressure detection port, 127 the first outlet, 130 the retention link equipment, 131 the first shell, 132 the second inlet, 133 the second outlet, 134 the sampling port, 135 the first toxicity detection port, 136 the second temperature detection port, 137 the second shell, 138 the second pressure detection port, 139 the pressurization port, 140 the first pressure relief port, 150 the processing link equipment, 151 the sedimentation link device, 1511 the third shell, 1512 the third inlet, 1513 the third outlet, 1514 the clear liquid outlet, 1515 the gas outlet, 1516 the second toxicity detection port, 1517 the third pressure detection port, 1518 the third pressure relief port, 152 the filter press device, 153 the evaporation device, 154 the gas purification device.

Detailed ways

In order to better understand the above technical scheme, the technical scheme of the embodiment of the present disclosure is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiment of the present disclosure and the specific features in the embodiments are detailed descriptions of the technical scheme of the embodiment of the present disclosure, rather than limitations on the technical scheme of the present disclosure. In the absence of conflict, the embodiment of the present disclosure and the technical features in the embodiments can be combined with each other.

As shown in FIG1 , an aluminum electrolysis overhaul slag disposal system proposed in accordance with an embodiment of the present disclosure includes: a preparation component 110, which is used to process the overhaul slag to form a slurry; a tubular segment device 120, wherein the first inlet 121 of the tubular segment device 120 is connected to the preparation component 110; the tubular segment device 120 includes: a plurality of connecting pipes 123 and an elbow 124, wherein one elbow 124 is provided between each two adjacent connecting pipes 123, and the tubular segment is used to mix the slurry evenly; a stay segment device 130, wherein the second inlet 132 of the stay segment device 130 is connected to the first outlet 127 of the tubular segment device 120, and the stay segment device 130 is used to make the slurry fully react to dissolve fluoride and/or cyanide, thereby forming a to-be-discharged substance; a treatment segment device 150, which is connected to the second outlet 133 of the stay segment device 130, and is used to treat and discharge the to-be-discharged substance.

It is understandable that the aluminum electrolysis overhaul slag disposal system provided in the embodiment of the present disclosure may be provided with a preparation component 110, a tubular segment device 120, a retention segment device 130, and a processing segment device 150. Specifically, the overhaul slag can be crushed and then added with defluorinating agents and decyanating agents through the preparation component 110, and a slurry with a certain solid-liquid ratio can be configured after wet grinding. The slurry is transported to the tubular segment device 120 through the first inlet 121. In the tubular segment device 120, the slurry flows turbulently, so that the overhaul slag is fully mixed with defluorinating agents and decyanating agents, and the products generated during the turbulent flow of the slurry increase the pressure in the tubular segment device. The first accommodation space contains a temperature regulating medium to provide temperature assurance. Subsequently, the fully mixed slurry is transported to the retention segment device 130 through the first outlet 127 and the second inlet 132. In the stay link device 130, the slurry is provided with a suitable temperature and pressure so that the overhaul slag and the reagent react fully to dissolve the fluoride and cyanide, thereby forming the material to be discharged. The residual fluoride and cyanide in the material to be discharged meet the discharge and reuse standards. Such a setting makes the slurry configuration, the dissolution reaction of fluoride and cyanide and the subsequent disposal and utilization of the material to be discharged continuous and uninterrupted. The release of harmful fluoride and cyanide in the intermediate process is avoided, and the reaction is made more complete, thereby improving the treatment efficiency.

It is understandable that the preparation component 110 can perform coarse and fine crushing operations on the overhaul slag to obtain overhaul slag particles. This increases the contactable surface area of the overhaul slag particles, so that the overhaul slag particles can be fully contacted with the reagent in the future. The overhaul slag particles are mixed with the reagent containing the defluorinating agent and the decyanating agent components and then wet-milled to obtain a slurry with a certain solid-liquid ratio.

It is understandable that there may be multiple stay link devices 130, and multiple stay link devices 130 may be arranged in parallel. Specifically, the number of arrangements may be determined according to the amount of slurry.

In some embodiments, as shown in FIG. 2 , the tubular segment device 120 may include: a plurality of tubular layers 122 connected in series, The tubular layer 122 close to the preparation assembly 110 may be provided with the first inlet 121, and the tubular layer 122 close to the stop link device 130 may be provided with the first outlet 127. Each tubular layer 122 may include: a plurality of connecting pipes 123 and elbows 124, and one elbow 124 is provided between each two adjacent connecting pipes 123. A first temperature detection port 125 may be provided in at least one tubular layer 122; a first pressure detection port 126 may be provided in at least one tubular layer 122.

It is understandable that, in some embodiments, the tubular segment device 120 may be provided with a plurality of tubular layers 122, and the plurality of tubular layers 122 are connected in series to increase the overall length of the tubular layer 122, thereby increasing the mixing time of the overhaul slag with the defluorination agent, decyanation agent and other agents, and ensuring more complete mixing. Each tubular layer 122 is composed of a plurality of connecting pipes 123 and elbows 124. Specifically, an elbow 124 is provided between each two adjacent connecting pipes 123, and the setting direction of the connecting pipe 123 is changed by the elbow 124, so that each tubular layer 122 presents an "S" shape, further increasing the overall length of each tubular layer 122, and ensuring more complete mixing of the overhaul slag and the agents.

It is understood that the number of tubular layers 122 and the number of connecting pipes 123 and elbows 124 in each tubular layer 122 can be determined according to the amount of slurry to be processed. For example, 1 to 6 tubular layers 122 can be provided, and multiple connecting pipes 123 can be arranged horizontally or vertically in the tubular layer 122 according to the actual use scenario. Each tubular layer 122 can be provided with 2 to 6 connecting pipes 123 connected in series.

It can be understood that, in some embodiments, the pressure of the slurry in the tubular layer 122 is determined by the bending degree and length of the tubular layer 122. A first temperature detection port 125 and a first pressure detection port 126 may be provided on the tubular layer 122 to detect the temperature and pressure of the slurry in the tubular layer 122. In this way, the mixing state of the overhaul slag particles and the reagent in the tubular layer 122 is detected. In addition, when the slurry pressure and temperature are not detected, sealing members may be provided at both the first temperature detection port 125 and the first pressure detection port 126 to keep the tubular layer 122 in a sealed state to prevent leakage of harmful substances.

In some embodiments, as shown in FIG. 3 , the connecting tube 123 may include: a first tube body 1231 for conveying the slurry; a second tube body 1232, sleeved on the first tube body 1231, with a first accommodation space formed between the first tube body 1231 and the second tube body 1232; the first accommodation space is used to accommodate a temperature control medium.

It is understood that, in some embodiments, the connecting pipe 123 may be provided with a first tube body 1231 and a second tube body 1232. Specifically, the second tube body 1232 is sleeved on the first tube body 1231, and the first temperature detection port 125 may be opened on the second tube body 1232 and connected to the first tube body 1231, so as to insert the temperature sensor into the first tube body 1231 to detect the slurry temperature. The first pressure detection port 126 may be opened on the second tube body 1232 and connected to the first tube body 1231, so as to insert the pressure sensor into the first tube body 1231 to detect the slurry pressure. And a first accommodation space may be formed between the first tube body 1231 and the second tube body 1232. The first accommodation space may accommodate a temperature regulating medium, so as to adjust the temperature of the temperature regulating medium according to the slurry temperature data detected at the first temperature detection port 125, and then cool, keep warm or heat the slurry in the first tube body 1231. This is to prevent the slurry temperature in the tubular segment device 120 from being affected by the external temperature, resulting in insufficient mixing, especially in the north. Areas with large annual temperature changes. Therefore, it can improve stability and subsequent dissolution efficiency.

It is understandable that a plurality of first temperature regulating medium passages may be formed in the first accommodation space, and the plurality of first temperature regulating medium passages may be arranged in series to adjust the temperature of the temperature regulating medium in the first accommodation space as a whole. Alternatively, the plurality of first temperature regulating medium passages may be arranged in parallel, and when it is detected that the temperature of a local area in the first tube body 1231 needs to be adjusted, the corresponding first temperature regulating medium passage may be controlled to adjust the temperature of the temperature regulating medium in the local area.

In some embodiments, as shown in FIG. 4 , the stop link device 130 may include: a first shell 131 , which may be formed with the second inlet 132 and the second outlet 133 ; a sampling port 134 , which may be opened in the first shell 131 ; a first toxicity detection port 135 , which may be opened in the first shell 131 , for detecting the toxic substance content of the slurry ; a temperature control component , which may be arranged in the first shell 131 , for adjusting the temperature of the slurry ; and a pressure regulating component , which may be arranged in the first shell 131 , for adjusting the pressure of the slurry .

It is understood that the stay link device 130 can be provided with a first shell 131, a sampling port 134, a first toxicity detection port 135, a temperature adjustment component and a pressure adjustment component. Among them, the first shell 131 can be formed with a second inlet 132 and a second outlet 133, and the slurry mixed sufficiently by the tubular link device 120 is transported to the first shell 131 through the second inlet 132, where it stays and reacts sufficiently to dissolve harmful fluorides and cyanides. And a sampling port 134 can be opened on the first shell 131 to obtain a slurry sample, which is convenient for the staff to analyze the current slurry state. A first toxicity detection port 135 can also be opened at the first shell 131 to detect the current dissolution of fluorides and cyanides in the slurry, and whether the slurry meets the discharge and reuse standards. The temperature adjustment component can be set in the first shell 131 to adjust the temperature of the slurry in the first shell 131. The pressure adjustment component can be set in the first shell 131 to adjust the pressure of the slurry in the first shell 131 to ensure that the slurry is always provided with a suitable temperature and pressure. The stay link device 130 allows the overhaul slag and the reagent to fully react, thereby achieving continuous and efficient dissolution of fluoride and cyanide from the overhaul slag so that the slurry meets the discharge and reuse standards. The stay link device 130 also makes the reaction regulation stable and controllable, reduces the impact of regional seasonal temperature changes on the reaction, and improves reliability.

It is understandable that the sampling port 134, the first toxicity detection port 135, the temperature regulating component and the pressure regulating component may be provided with seals to ensure the sealing of the retention stage equipment 130 and ensure that the reaction can proceed continuously and stably.

Exemplarily, the first toxicity detection port 135 can detect F-, CN-, and pH values through a toxic component detection instrument.

In some embodiments, as shown in FIG. 4 , the temperature control assembly may include: a second temperature detection port 136, which may be opened in the first shell 131; a second shell 137, which may be sleeved in the first shell 131, and a second accommodation space may be formed between the second shell 137 and the first shell 131. The second accommodation space is used to accommodate the temperature control medium.

It is understood that the temperature control component can be provided with a second temperature detection port 136 and a second shell 137. Specifically, the second shell 137 can be sleeved on the first shell 131, and the second temperature detection port 136 can be opened on the first shell 131. The temperature sensor can be inserted into the first shell 131 through the second temperature detection port 136 to detect the current temperature of the slurry. A second accommodation space can be formed between the first shell 131 and the second shell 137. The second accommodation space can accommodate the temperature control medium to adjust the temperature according to the second temperature. The temperature of the temperature regulating medium is adjusted based on the slurry temperature data detected by the temperature detection port 136. The slurry in the first shell 131 can be cooled, kept warm or heated, thereby reducing the impact of regional seasonal temperature changes on the reaction and improving reliability.

It is understandable that a plurality of second temperature regulating medium passages may be formed in the second accommodation space, and the plurality of second temperature regulating medium passages may be arranged in series to adjust the temperature of the temperature regulating medium in the second accommodation space as a whole. Alternatively, the plurality of second temperature regulating medium passages may be arranged in parallel, and when it is detected that the temperature in a local area in the first housing 131 needs to be adjusted, the corresponding second temperature regulating medium passage may be controlled to adjust the temperature of the temperature regulating medium in the local area.

In some embodiments, as shown in Figure 4, the pressure regulating assembly includes: a second pressure detection port 138, which can be opened in the first shell 131; a pressurizing port 139, which can be opened in the second shell 137 and connected to the first shell 131, for increasing the internal pressure of the first shell 131; a first pressure relief port 140, which can be opened in the second shell 137 and connected to the first shell 131, for releasing the internal pressure of the first shell 131; a valve body, which can be respectively arranged at the pressurizing port 139 and the first pressure relief port 140; a pressurizing device, which can be connected to the pressurizing port 139, for conveying inert gas to the inside of the first shell 131 through the pressurizing port 139.

It is understandable that the pressure regulating assembly can be provided with a second pressure detection port 138, a pressurizing port 139, a first pressure relief port 140, a valve body and a pressurizing device. Specifically, the second pressure detection port 138 can be opened on the first shell 131, and the pressure sensor can be inserted into the first shell 131 from the second pressure detection port 138 to detect the current pressure of the slurry. According to the data detected by the pressure sensor, it is determined how to adjust the internal pressure of the first shell 131. Among them, the pressurizing port 139 can be opened in the second shell 137 and connected to the first shell 131, and the pressurizing port 139 is connected to the pressurizing device. When it is determined that the internal pressure of the first shell 131 needs to be increased, the valve body at the pressurizing port 139 is opened, and the pressurizing device delivers an inert gas such as argon into the first shell 131 through the pressurizing port 139, so as to increase the internal pressure of the first shell 131, while the inert gas will not react with the slurry, thereby improving stability. When it is determined that the internal pressure of the first shell 131 needs to be reduced, the valve body at the first pressure relief port 140 is opened to release the pressure in the first shell 131. This ensures that the internal pressure of the first shell 131 is always within a suitable range, so that the reaction is more complete and the dissolution efficiency is improved.

In some embodiments, the pressure in the tubular segment device 120 and/or the retention segment device 130 is 0 MPa to 1.6 MPa; the temperature of the slurry in the tubular segment device 120 and/or the retention segment device 130 is 15°C to 80°C.

It is understood that the pressure in the tubular segment device 120 and the retention segment device 130 is controlled within the range of 0 MPa to 1.6 MPa, and the slurry temperature in the tubular segment device 120 and the retention segment device 130 is controlled within the range of 15° C. to 80° C. to ensure that the slurry in the tubular segment device 120 is fully mixed, and the slurry in the retention segment device 130 reacts more fully, thereby improving the dissolution efficiency. The pressure in the tubular segment device 120 can be determined according to the bending degree and length of the tubular layer 122.

In some embodiments, the solid-liquid ratio of the slurry prepared by the preparation assembly 110 is 1:10 to 1:1, so as to ensure that the overhaul slag particles in the subsequent slurry are fully mixed with the reaction reagents, and ensure the dissolution effect.

In some embodiments, as shown in FIG. 1 , the processing link equipment 150 may include: a sedimentation link device 151, which may be connected to the second outlet 133 and used to sediment the slurry; a filter press device 152, which may be connected to the second outlet 133 through a slurry pump; The sedimentation link device 151; the evaporation device 153 can be connected to the sedimentation link device 151 and the filter press device 152 respectively, and is used for evaporating the clear liquid produced by sedimentation and the filtrate produced by filter press; the gas purification device 154 is connected to the sedimentation link device 151.

It is understood that the processing link equipment 150 can be provided with a sedimentation link device 151, a filter press device 152, an evaporation device 153 and a gas purification device 154. Specifically, the sedimentation link device 151 can be connected to the second outlet 133 to transport the fluoride and cyanide to be discharged to the sedimentation link device 151 for sedimentation. Thereby, the discharge is layered to produce sediment and clear liquid, and the clear liquid is located above the sediment. The filter press device 152 can be connected to the sedimentation link device 151 through a slurry pump to filter the sediment through the filter press device 152 to produce filter residue and filtrate, and the filter residue is transported out for reuse. And the evaporation device 153 can be connected to the sedimentation link device 151 and the filter press device 152 respectively, and the clear liquid produced by evaporation and sedimentation and the filtrate produced by filter press can be pumped into the evaporation device 153 through the pump body for evaporation treatment. The salt obtained by the above evaporation treatment can be comprehensively utilized and the distilled water obtained by evaporation can be recycled, thereby improving resource utilization. The gas purification device 154 can be connected to the sedimentation device 151 to purify the gas in the sedimentation device 151 to further eliminate residual harmful substances and ensure that the emissions meet the standards.

In some embodiments, as shown in FIG. 5 , the sedimentation link device 151 may include: a third shell 1511, the third shell 1511 may be formed with a third inlet 1512 and a third outlet 1513, wherein the third inlet 1512 may be connected to the second outlet 133, and the third outlet 1513 may be connected to the filter press device 152 through the slurry pump; a clear liquid outlet 1514 may be provided in the third shell 1511 and may be connected to the evaporation device 153; a gas outlet 1515 may be provided in the third shell 1511 and may be connected to the gas purification device 154; a second toxicity detection port 1516 may be provided in the third shell 1511 and may be used to detect the toxic substance content of the clear liquid; a third pressure detection port 1517 may be provided in the third shell 1511; a third pressure relief port 1518 may be provided in the third shell 1511 and may be used to release the gas pressure in the third shell 1511.

It can be understood that the sedimentation link device 151 can be provided with a third shell 1511, a clear liquid outlet 1514, a gas outlet 1515, a second toxicity detection port 1516, a third pressure detection port 1517 and a third pressure relief port 1518. Among them, the third shell 1511 can be formed with a third inlet 1512 and a third outlet 1513, wherein the third inlet 1512 can be connected to the second outlet 133 to transport the material to be discharged into the third shell 1511 through the second outlet 133 and the third inlet 1512. The third outlet 1513 can be connected to the filter press device 152 through a slurry pump to transport the sediment after sedimentation to the filter press device 152 for pressure filtration. The clear liquid outlet 1514 can be provided on the third shell 1511, and can be located in the middle and upper part of the third shell 1511, so as to transport the clear liquid generated after sedimentation to the evaporation device 153; specifically, a pump body can be provided between the evaporation device 153 and the clear liquid outlet 1514, so as to pump the clear liquid into the evaporation device 153. The third pressure detection port 1517 can be provided on the third shell 1511 to detect the pressure in the third shell 1511. And the third pressure relief port 1518 can be provided on the third shell 1511. When it is detected that the pressure in the third shell 1511 is too high, the pressure is relieved through the third pressure relief port 1518 to ensure the stability of the sedimentation process. The second toxicity detection port 1516 is provided in the third shell 1511, and a toxicity online detector can be inserted into the third shell 1511 from the second toxicity detection port 1516 to detect the content of toxic substances in the third shell 1511, so as to ensure that after being treated by the tubular link equipment 120 and the retention link equipment 130, the cyanide and fluoride dissolution effect of the overhaul slag is good, so that the discharge meets the discharge and reuse standards.

Compared with the prior art, the aluminum electrolysis overhaul slag disposal system provided by the embodiment of the present disclosure includes at least the following beneficial effects: the aluminum electrolysis overhaul slag disposal system provided by the embodiment of the present disclosure is provided with a preparation component, a tubular link device, a retention link device and a processing link device. Specifically, the overhaul slag is crushed by the preparation component, and then a defluorinating agent and a decyanating agent are added, and a slurry with a certain solid-liquid ratio is configured after wet grinding. The slurry is transported to the tubular link device through the first inlet. In the tubular link device, the slurry flows turbulently, so that the overhaul slag is fully mixed with the defluorinating agent and the decyanating agent, and the products generated during the turbulent flow of the slurry increase the pressure in the tubular link device. Subsequently, the fully mixed slurry is transported to the retention link device through the first outlet and the second inlet. In the retention link device, a suitable temperature and pressure are provided for the slurry so that the overhaul slag and the agent fully react, dissolve the fluoride and cyanide, and form the material to be discharged, so that the residual fluoride and cyanide in the material to be discharged meet the discharge and reuse standards. Such an arrangement allows the slurry preparation, the dissolution reaction of fluoride and cyanide and the subsequent disposal and utilization of the discharged matter to be continuous, avoiding the release of harmful fluoride and cyanide in the intermediate process, and making the reaction more complete, thereby improving the treatment efficiency.

In the description of the present disclosure, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the present disclosure.

In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

The above are only preferred embodiments of the present disclosure and are not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

An aluminum electrolysis overhaul slag disposal system, comprising:

preparing components for processing overhaul slag into a slurry;

A tubular segment device, wherein a first inlet of the tubular segment device is connected to the preparation component, the tubular segment device comprises: a plurality of connecting pipes and elbows, wherein one elbow is provided between each two adjacent connecting pipes, and the tubular segment device is used to mix the slurry uniformly;

A retention link device, wherein the second inlet of the retention link device is connected to the first outlet of the tubular link device, and the retention link device is used to allow the slurry to react sufficiently to dissolve fluoride and/or cyanide, thereby forming a to-be-discharged substance; and

The processing link equipment is connected to the second outlet of the staying link equipment and is used for processing and discharging the material to be discharged.
The aluminum electrolysis overhaul slag disposal system according to claim 1, wherein the tubular link equipment comprises:

A plurality of tubular layers connected in series, wherein the tubular layer close to the preparation component is provided with the first inlet, and the tubular layer close to the stop link device is provided with the first outlet, and each tubular layer comprises: a plurality of connecting pipes and elbows, and one elbow is provided between each two adjacent connecting pipes;

A first temperature detection port is opened in at least one of the tubular layers; and

The first pressure detection port is opened in at least one of the tubular layers.
The aluminum electrolysis overhaul slag disposal system according to claim 1 or 2, wherein the connecting pipe comprises:

A first pipe body, used for conveying the slurry;

The second tube body is sleeved on the first tube body, and a first accommodating space is formed between the first tube body and the second tube body, and the first accommodating space is used to accommodate a temperature regulating medium.
According to any one of claims 1 to 3, the aluminum electrolysis overhaul slag disposal system, wherein the stop link equipment comprises:

a first shell, the first shell forming the second inlet and the second outlet;

A sampling port is provided in the first shell;

A first toxicity detection port is provided in the first shell and is used to detect the toxic substance content of the slurry;

A temperature adjustment component, disposed in the first shell, for adjusting the temperature of the slurry;

A pressure regulating assembly is arranged on the first shell and is used to regulate the slurry pressure.
The aluminum electrolysis overhaul slag disposal system according to claim 4, wherein the temperature regulating component comprises:

A second temperature detection port is provided in the first shell;

The second shell is sleeved on the first shell, and a second accommodating space is formed between the second shell and the first shell, and the second accommodating space is used to accommodate the temperature regulating medium.
The aluminum electrolysis overhaul slag disposal system according to claim 4 or 5, wherein the voltage regulating component comprises:

A second pressure detection port is provided in the first shell;

A pressurizing port, which is opened in the second shell and communicated with the first shell, and is used to increase the internal pressure of the first shell;

a first pressure relief port, which is disposed in the second shell and is connected to the first shell and is used to release the internal pressure of the first shell;

A valve body, respectively disposed at the pressurizing port and the first pressure relief port;

A pressurizing device is connected to the pressurizing port and is used to transport the inert gas into the first shell through the pressurizing port.
The aluminum electrolysis overhaul slag disposal system according to any one of claims 1 to 6, wherein:

The pressure in the tubular segment equipment and/or the dwelling segment equipment is 0 MPa to 1.6 MPa;

The slurry temperature in the tubular segment equipment and/or the retention segment equipment is 15°C to 80°C.
The aluminum electrolysis overhaul slag disposal system according to any one of claims 1 to 7, wherein:

The solid-to-liquid ratio of the slurry prepared by the preparation assembly is 1:10 to 1:1.
The aluminum electrolysis overhaul slag disposal system according to any one of claims 1 to 8, wherein the processing link equipment includes:

A sedimentation device, connected to the second outlet, for sedimenting the slurry;

A filter press device connected to the sedimentation device via a slurry pump;

An evaporation device, connected to the sedimentation device and the filter press device, respectively, for evaporating the clear liquid produced by sedimentation and the filtrate produced by filter press;

A gas purification device is connected to the sedimentation device.
The aluminum electrolysis overhaul slag disposal system according to claim 9, wherein the sedimentation link device comprises:

A third shell, wherein the third shell is formed with a third inlet and a third outlet, wherein the third inlet is connected to the second outlet, and the third outlet is connected to the filter press device through the slurry pump;

A clear liquid outlet is provided in the third shell and connected to the evaporation device;

A gas outlet, opened in the third shell and connected to the gas purification device;

A second toxicity detection port is provided in the third housing and is used to detect the toxic substance content of the clear liquid;

A third pressure detection port is provided on the third housing;

The third pressure relief port is provided in the third shell and is used for releasing the gas pressure in the third shell.