A system for mixing ingredients

Abstract

The utility model discloses a kind of mixed feeding systems, including discharge bin I, discharge bin II, downcomer, sand removing device, air slide system;The discharge bin I is connected with downcomer I, downcomer I is connected with the air slide below;The discharge bin II is connected with downcomer II, downcomer II is connected with sand removing device, sand removing device is connected with the air slide below;Fresh alumina and fluorine-carrying alumina are transported to electrolytic flue gas purification system by air slide.The utility model is through newly adding downcomer II and sand removing device below discharge bin II, fluorine-carrying alumina is filtered clean after passing through sand removing device, and then into the air slide connected below and fresh alumina are mixed and fed, increase fluorine-carrying alumina circulation feeding to increase the total feeding amount of purification system, realize the maintenance of higher alumina concentration in flue gas purification system, can improve electrolytic flue gas HF purification efficiency, reduce fluorine pollution and reduce fluorine salt unit consumption of electrolytic aluminium production.

Description

Technical Field

[0001] This utility model relates to the field of aluminum electrolysis technology, specifically a system for feeding fresh alumina and fluorinated alumina into an electrolysis flue gas purification system for mixing. Background Technology

[0002] In the aluminum electrolysis industry, the dry process is mainly used to purify aluminum electrolysis flue gas. This process utilizes alumina, the raw material for electrolysis, as an adsorbent. An adsorption reaction occurs within the dust collector of the purification system, reducing the concentration of hydrogen fluoride and sulfur dioxide in the flue gas. The dry purification process involves two silos located in the middle of the electrolysis plant. Fresh alumina is transported from the fresh silo to the flue gas purification system via a pneumatic chute for adsorption. After the reaction, a portion of the fluorinated alumina is recycled for further adsorption, while the remaining portion is conveyed via bucket elevator to the fluorinated silo as raw material for aluminum electrolysis production.

[0003] Currently, the alumina in fluorinated alumina bins contains a significant amount of impurities and sandy materials. Directly introducing these into the feeding process affects material flowability, leading to blockages in material conveying chutes and reaction equipment, impacting feeding and environmental emission safety. Therefore, the material in fluorinated alumina bins is unsuitable as an adsorbent for the purification and recycling of electrolytic flue gas. Mixing the alumina in the fluorinated bin with fresh alumina during feeding is crucial. On one hand, it reduces the amount of fresh alumina fed while maintaining stable parameters; on the other hand, it increases the total feed volume of the purification system, maintaining a high alumina concentration within the flue gas purification system. This improves the HF purification efficiency of electrolytic flue gas, reduces fluoride pollution, and lowers the consumption of fluoride salts in electrolytic aluminum production. Utility Model Content

[0004] This utility model provides a mixing and feeding system, the purpose of which is to realize the use of the material in the fluorinated alumina bin as an adsorbent for the purification and recycling of electrolytic flue gas. The fluorinated alumina filtered by the sand removal device is mixed and fed with fresh alumina and then transported to the electrolytic flue gas purification system through a pneumatic chute.

[0005] The technical solution adopted by this utility model is: a mixed feeding system, including unloading bin I, unloading bin II, discharge pipe I, discharge pipe II, sand removal device, and pneumatic chute system;

[0006] The unloading hopper I is used to hold fresh alumina and is connected to the pneumatic chute system through the discharge pipe I;

[0007] The unloading hopper II is used to load alumina fluoride and is connected to a sand removal device via a discharge pipe II. The sand removal device is connected to a pneumatic chute system, and the sand removal device is located downstream of the discharge pipe I on the pneumatic chute system. The pneumatic chute system is connected to an electrolytic flue gas purification system.

[0008] Furthermore, in the above scheme, the discharge pipe I is located below the unloading bin I and the discharge pipe I is equipped with an unloading valve I.

[0009] Furthermore, in the above scheme, the discharge pipe II is located below the unloading hopper II, and the discharge pipe II is equipped with an unloading valve II; the unloading valve I and the unloading valve II are manual butterfly valves and are kept in the normally open state.

[0010] Furthermore, in the above scheme, a control valve I is installed on the pneumatic chute system between the feed pipe I and the sand removal device. The control valve I is an electric slide gate valve, which is used to remotely control the valve opening to adjust the flow rate of fresh alumina.

[0011] Furthermore, in the above scheme, a control valve II is provided between the feed pipe II and the sand removal device. The control valve II is an electric slide gate valve, which is used to remotely control the valve opening.

[0012] Furthermore, the above scheme further includes a pneumatic chute system consisting of at least two chute sections connected in series. Each chute section includes a material chamber, a venting plate, and an air chamber at the bottom of the material chamber. The air chamber of each chute section is connected to a branch pipe and an air supply pipeline, and a branch pipe valve is installed on each branch pipe.

[0013] Furthermore, in the above scheme, the sand removal device is a drum screen structure with a screen aperture size of 0.8mm; the sand removal device is driven by a variable frequency motor, which is used to remotely control the motor frequency according to the flow rate change.

[0014] Furthermore, the above scheme includes a flow meter in the sand removal device for detecting the flow rate of fluorinated alumina entering the sand removal device.

[0015] Furthermore, in the above scheme, the ratio of the fresh alumina to the fluorinated alumina mixture is 3:1.

[0016] The beneficial effects of this invention are as follows: The mixing and feeding system is used to use the material in the fluorinated alumina bin as an adsorbent for the purification and recycling of electrolytic flue gas. The fluorinated alumina filtered by the sand removal device is mixed and fed with fresh alumina, and then transported to the electrolytic flue gas purification system through a pneumatic chute. On the one hand, it can reduce the amount of fresh alumina fed while maintaining stable indicators; on the other hand, it can increase the total amount of material fed into the purification system, thereby maintaining a high alumina concentration in the flue gas purification system, improving the HF purification efficiency of electrolytic flue gas, reducing fluoride pollution, and lowering the fluoride salt consumption per unit in electrolytic aluminum production. Attached Figure Description

[0017] Figure 1 It is an existing electrolysis flue gas purification and feeding system.

[0018] Figure 2 This is a schematic diagram of the implementation of the mixing and feeding system of this utility model.

[0019] Explanation of reference numerals in the attached figures

[0020] The numbers and names in the diagram are as follows:

[0021] 1-Unloading bin I; 2-Unloading bin II; 3-Discharge pipe I; 4-Discharge pipe II; 5-Sand removal device; 6-Pneumatic chute system; 7-Unloading valve I; 8-Unloading valve II; 9-Control valve I; 10-Control valve II; 11-Flow meter; 12-Air supply pipeline; 13-Branch valve. Detailed Implementation

[0022] The embodiments of the utility model are further described in detail below with reference to the accompanying drawings, so that the purpose, technical solution and technical effect of the utility model can be more clearly presented.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] Example 1

[0025] like Figure 1 The diagram shows an existing electrolytic flue gas purification and feeding system. The basic structure of the existing feeding system includes: unloading bin I1, unloading valve I2, control valve I9, pneumatic chute 6, and gas supply pipeline 12, etc., which are used to transport fresh alumina from unloading bin I1 to the electrolytic flue gas purification system.

[0026] This utility model's mixing and feeding system, which is also used to transport alumina from unloading hopper I1 to the electrolytic flue gas purification system, adds unloading hopper II2 and a sand removal device 5. Specifically, a sand removal device 5 is added below unloading hopper II2. After being filtered clean by the sand removal device 5, the fluorinated alumina enters the pneumatic chute 6 connected below and is mixed with fresh alumina for feeding. This increases the circulating feeding of fluorinated alumina, thereby increasing the total feeding amount of the purification system and maintaining a high alumina concentration in the flue gas purification system. This can improve the HF purification efficiency of electrolytic flue gas, reduce fluoride pollution, and reduce the unit consumption of fluoride salts in electrolytic aluminum production.

[0027] like Figure 2As shown, the mixing and feeding system of this utility model includes unloading bin I1, unloading bin II2, feeding pipe I3, feeding pipe II4, control valve I9, control valve II10, sand removal device 5, and pneumatic chute 6. The two bins are used for temporary storage of materials. For example, unloading bin I1 is a fresh alumina bin, and unloading bin II2 is a fluorinated alumina bin. Fresh alumina and fluorinated alumina are mixed and fed into the electrolytic flue gas purification system through the pneumatic chute 6.

[0028] To achieve pneumatic chute conveying, a high-pressure centrifugal fan generates high-pressure air which enters the air chamber of the chute section through an air pipe. The high-pressure air in the air chamber passes through a permeable layer into the material chamber as the transmission power. The powder in the material chamber of the chute section cannot pass through the permeable layer, and the air pressure in the material chamber can be released through the chute pressure relief device to ensure that there is no air resistance in the material chamber. This facilitates the boiling state of the powder in the material chamber, allowing the powder to pass through the material chamber smoothly and quickly.

[0029] Below the unloading hopper I1 is a discharge pipe I3. Discharge pipe I3 ​​is equipped with a discharge valve I7 and connected to the inlet of the pneumatic chute 6. The pneumatic chute 6 is equipped with a control valve I9. The unloading hopper I1 can be fed independently. For example, by closing the control valve II10 below the unloading hopper II2, opening the discharge valve I7 and control valve I9, and starting the pneumatic chute 6, the material in the unloading hopper I1 enters the pneumatic chute via the discharge pipe I3 ​​and discharge valve I7, and is then transported to the electrolysis flue gas purification system via the pneumatic chute 6. The pneumatic chute 6 is powered by a high-pressure air source, typically provided by a centrifugal fan, for material transport. Control valve I9 ​​is ​​used to control the uniform flow rate of material entering the purification system. Control valve I9 ​​is ​​an electric slide gate valve equipped with a motor and a frequency converter. The motor is controlled by the frequency converter, allowing for remote adjustment of the motor speed as needed to regulate the material flow rate.

[0030] Below the unloading silo II2, a discharge pipe II4 is connected. Discharge pipe II4 is equipped with a discharge valve II8 and a control valve II10, and is connected to the inlet of the desanding device 5. The desanding device 5 is connected to the inlet of the pneumatic chute 6. Fluorine-loaded alumina, after being filtered clean by the desanding device 5, enters the pneumatic chute 6 connected below and is mixed with fresh alumina. Unloading silos I1 and II2 can be mixed. For example, by opening discharge valves I7, II8, I9, and II10, and activating the pneumatic chute 6 and desanding device 5, material in unloading silo I1 enters the pneumatic chute via discharge pipe I3 ​​and discharge valve I7. Material in unloading silo II2, after passing through discharge pipe II4 and discharge valve II8 and being filtered clean by the desanding device 5 to remove impurities larger than 0.8mm, enters the pneumatic chute 6. Fresh alumina and fluorine-loaded alumina are mixed and fed, and then transported to the electrolysis flue gas purification system via the pneumatic chute 6. The pneumatic chute 6 is powered by a high-pressure air source, typically provided by a centrifugal fan, and is used for material transfer. Control valves I-9 and II-10 are used to control the uniformity of material flow into the purification system. Control valve II-10 is an electric slide gate valve, equipped with a motor and frequency converter. The motor is controlled by the frequency converter, allowing for remote adjustment of the motor speed as needed to regulate the material flow.

[0031] The pneumatic chute 6 is composed of at least two chute sections connected in series. The air supply pipeline 12 is connected to multiple branch pipes. Each branch pipe is equipped with a branch pipe valve 13. Each chute section includes a material chamber, a permeable plate, and an air chamber at the bottom of the material chamber. The air chamber of each chute section is connected to a branch pipe.

[0032] The sand removal device 5 operates on a drum-type sand removal principle, equipped with a motor and frequency converter. The motor frequency can be remotely controlled via computer according to changes in flow rate. The sand removal device 5 can handle a conveying capacity of 30 tons / hour of fluorinated alumina, with a rotary screen mesh size of 0.8mm. Impurities enter the slag box. The sand removal device 5 is equipped with a flow meter 11 to detect the material flow rate.

[0033] Fresh alumina and fluorinated alumina are transported to the electrolytic flue gas purification system via a pneumatic chute 6, with a mixture ratio of 3:1.

[0034] To ensure safety, the mixing and feeding system also includes warning lights linked to flow meter 11. When the flow rate of the fluorinated alumina is too high, an audible and visual warning light is emitted. On-site personnel can manually adjust the control valve to control the flow rate of the fluorinated alumina. The remote control panel of the mixing and feeding system also includes alarms to facilitate timely problem detection by the main control room staff and allow for continuous and uniform adjustment of the alumina flow rate.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of the patent application of the present utility model. All equivalent changes, equivalent substitutions or modifications made within the technical spirit and principles indicated by the present utility model should be included within the scope of patent protection covered by the present utility model.

Claims

1. A mixing and feeding system, characterized in that: It includes unloading bin I (1), unloading bin II (2), discharge pipe I (3), discharge pipe II (4), sand removal device (5), and pneumatic chute system (6); The unloading bin I (1) is used to hold fresh alumina and is connected to the pneumatic chute system (6) through the discharge pipe I (3); The unloading bin II (2) is used to load alumina fluoride and is connected to the desanding device (5) through the discharge pipe II (4). The desanding device (5) is connected to the pneumatic chute system (6), and the desanding device (5) is located downstream of the discharge pipe I (3) on the pneumatic chute system (6). The pneumatic chute system (6) is connected to the electrolytic flue gas purification system.

2. The mixing and feeding system according to claim 1, characterized in that: The discharge pipe I (3) is located below the discharge bin I (1) and the discharge pipe I (3) is equipped with a discharge valve I (7).

3. The mixing and feeding system according to claim 2, characterized in that: The discharge pipe II (4) is located below the discharge bin II (2), and the discharge pipe II (4) is equipped with a discharge valve II (8); the discharge valve I (7) and the discharge valve II (8) are manual butterfly valves and are kept in the normally open state.

4. The mixing and feeding system according to claim 3, characterized in that: The pneumatic chute system (6) is equipped with a control valve I (9) located between the feed pipe I (3) and the sand removal device (5). The control valve I (9) is an electric slide gate valve, which is used to remotely control the valve opening to adjust the flow rate of fresh alumina.

5. The mixing and feeding system according to claim 3, characterized in that: A control valve II (10) is provided between the feed pipe II (4) and the sand removal device (5). The control valve II (10) is an electric slide gate valve, which is used to remotely control the valve opening.

6. The mixing and feeding system according to claim 1, characterized in that: The pneumatic chute system (6) is composed of at least two chute sections connected in series. Each chute section includes a material chamber, a permeable plate and an air chamber at the bottom of the material chamber. The air chamber of each chute section is connected to a branch pipe and an air supply pipeline (12). Each branch pipe is equipped with a branch pipe valve (13).

7. The mixing and feeding system according to claim 1, characterized in that: The sand removal device (5) is a drum screen structure with a screen hole size of 0.8mm. The sand removal device (5) is driven by a variable frequency motor, which is used to remotely control the motor frequency according to the flow rate change.

8. The mixing and feeding system according to claim 7, characterized in that: The sand removal device (5) is equipped with a flow meter (11) for detecting the flow rate of fluorinated alumina entering the sand removal device (5).

9. The mixing and feeding system according to claim 1, characterized in that: The ratio of fresh alumina to fluorinated alumina mixture is 3:1.

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