Red mud waste residue treatment device and treatment method thereof

Abstract

The invention relates to the technical field of waste treatment, in particular to a red mud waste residue treatment device and method, the device comprises a base and a hydrothermal box, the top of the base is fixedly connected with a conveying box, and the top of the conveying box is fixedly communicated with the bottom of the hydrothermal box; the side wall of the conveying box communicates with a calcining assembly used for calcining raw materials. The side, away from the conveying box, of the base is fixedly connected with a receiving box. A driving assembly for driving the calcining assembly to rotate is arranged on the outer side of the calcining assembly, and a conveying system for conveying raw materials is arranged in the conveying box; the calcining assembly comprises a calcining furnace, a plurality of 8-shaped pipes are fixedly connected in the calcining furnace, each 8-shaped pipe comprises a heating section and a cooling section, the heating section close to the conveying box penetrates through the side wall of the calcining furnace and communicates with the conveying box, the end, away from the heating section, of the cooling section communicates with an arc-shaped pipe, and the end, away from the cooling section, of the arc-shaped pipe communicates with the adjacent heating section; the device is complete in structure and complete in function, and the red mud waste residue treatment rate can be effectively increased.

Description

Technical Field

[0001] The invention relates to the technical field of waste treatment, and in particular to a red mud waste treatment device and a treatment method thereof. Background Art

[0002] Every year, a large amount of antibiotic residues enter the environment in my country, inducing microorganisms in the environment to develop drug resistance, causing certain harm to the ecological environment and human health. Red mud is a highly alkaline industrial solid waste produced in the production process of aluminum oxide industry. It is named because of its high iron oxide content and its appearance similar to red clay. With the rapid development of the aluminum industry, the annual emission of red mud worldwide has seriously exceeded the environmental load, causing huge disposal pressure and pollution risks. The efficient resource utilization of red mud is imminent.

[0003] Degradation of antibiotic wastewater usually uses various commercial catalysts for wastewater degradation. Although the existing various commercial catalysts can effectively degrade antibiotic wastewater, the manufacturing cost and market price of commercial catalysts are relatively high, resulting in high treatment costs. In the prior art, scientists have begun to use red mud as raw material to prepare composite catalysts through hydrothermal devices and calcination devices, which can not only reduce costs, but also make rational use of red mud to achieve the purpose of turning "waste" into treasure. Due to the huge difference between calcination temperature and hydrothermal temperature, in order to avoid damage to the preparation equipment, the prior art usually requires two sets of equipment, hydrothermal devices and calcination devices, which are prone to waste of raw materials during the transfer process, resulting in a lower conversion rate of finished products.

[0004] In summary, how to solve the problem that the prior art usually requires two sets of equipment, a hydrothermal device and a calcining device, and that the waste of raw materials is easy to occur during the transfer process, resulting in a decrease in the conversion rate of the finished product has become a difficult problem that needs to be solved urgently in the current field. Therefore, it is necessary to propose a red mud waste treatment device and a treatment method that can improve the conversion rate. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a red mud waste treatment device and a treatment method thereof. Through the design of the hydrothermal box and the mixing component, the red mud waste and other auxiliary materials can be effectively mixed and hydrothermally reacted. Then, through the repeated calcination and cooling of the calcination component, the calcination equipment and the hydrothermal equipment are effectively combined, the waste of raw materials is reduced, the raw materials are reasonably utilized, and the conversion rate of finished products is improved.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a red mud waste treatment device, comprising a base and a hydrothermal box, the top of the base is fixedly connected to a conveying box, and the top of the conveying box is fixedly connected to the bottom of the hydrothermal box; the hydrothermal box is electrically connected to a controller, and the controller is used to control the opening and closing of the hydrothermal box; a mixing assembly for mixing raw materials is provided in the hydrothermal box; the side wall of the conveying box is connected to a calcining assembly for calcining raw materials; a material receiving box is fixedly connected to the top of the base away from the conveying box.

[0007] A driving assembly for driving the calcining assembly to rotate is arranged outside the calcining assembly, and a conveying system for conveying raw materials is arranged inside the conveying box.

[0008] The calcining assembly comprises a calcining furnace, in which a plurality of 8-shaped tubes are fixedly connected, each of the 8-shaped tubes comprises a heating section and a cooling section, the heating section is made of heat-conducting material, and the cooling section is made of heat-insulating material.

[0009] The heating section close to the conveying box passes through the side wall of the calcining furnace and is connected to the conveying box and rotates together. The cooling section is connected to an arc tube at one end away from the heating section, and the end of the arc tube away from the cooling section is connected to the heating section of the adjacent 8-shaped tube; the arc tube away from the conveying box is connected to an output pipe, and the end of the output pipe away from the arc tube passes through the side wall of the calcining furnace and extends to above the material receiving box.

[0010] Heating elements for calcining raw materials are installed in each heating section, and the heating temperature in each heating section along the raw material conveying direction increases successively; the controller is used to control the operation of the heating elements.

[0011] The technical principles of the above scheme are as follows:

[0012] The red mud waste and auxiliary materials are put into the hydrothermal box in proportion, and pure water is added; the mixing component is started by the controller, and the water, red mud and auxiliary materials are stirred for 10-15 minutes to obtain a mixture; the hydrothermal box is started by the controller, and the stirred mixture is heated to 100-200°C to perform a hydrothermal reaction to obtain a semi-finished product.

[0013] The semi-finished product is then transported to a conveying box, and the gas supply system is opened through a controller to introduce an inert gas flow at room temperature into the conveying box, and the heating element is turned on at the same time; at this time, the gas flow transports the semi-finished product to the heating section and cooling section in each 8-shaped tube in turn for repeated heating, calcination and cooling, and the heating temperature gradually increases from 200°C to 1000°C along the conveying direction. After calcination is completed, the finished product is obtained.

[0014] For example, the initial temperature of the semi-finished product is about 200℃, the heating temperature of the first heating section is 300℃, and the subsequent heating sections increase by 100℃ along the conveying direction. The heating temperature of the last heating section is 1000℃. When the semi-finished product enters the heating section for the first time, it slides along the heating section driven by the airflow. At the same time, since the heating section is made of heat-conducting materials, the heat generated by the heating section will be transferred to the semi-finished product through heat transfer, thereby heating the semi-finished product; when the semi-finished product enters the cooling section through the heating section, since the cooling section is made of heat-insulating materials, the temperature of the cooling section is lower than that of the heating section. At this time, due to the blowing of inert gas and the temperature difference of the cooling section, the temperature of the semi-finished product will be slightly reduced in the cooling section to avoid a sudden increase in the temperature of the semi-finished product and affect the quality of the finished product; but the temperature of the semi-finished product in the heating section is greater than the temperature of the semi-finished product in the cooling section; the cooled semi-finished product enters the heating section in the next section of the 8-shaped tube through the arc tube for higher temperature heating, and then passes through the cooling section for cooling; finally, it passes through the 8-shaped tube in the last section, and is then sent to the receiving box through the output pipe to obtain the finished product.

[0015] The above scheme has the following beneficial effects:

[0016] 1. The present invention repeatedly heats and cools the semi-finished products through a number of 8-shaped pipes, so that the temperature of the semi-finished products gradually increases, greatly reducing the problems of poor quality of semi-finished products and low conversion rate of finished products due to sudden temperature rise; and the 8-shaped conveying method can effectively extend the conveying distance of the semi-finished products in the heating furnace of the same length compared to the conveying method of the straight pipe, thereby increasing the heating and cooling time of the semi-finished products and further improving the heating uniformity of the semi-finished products. For example, if the conveying method is a straight pipe, the heating temperature in this heating section may be 300°C, and the semi-finished products have entered the next heating section before being heated to 300°C, causing the semi-finished products to still be affected by the sudden temperature rise.

[0017] 2. The present invention gradually increases the temperature inside the device, thereby avoiding the device from cracking and breaking due to excessive temperature differences between adjacent internal areas. This allows the hydrothermal component and the calcination component to be combined on the same device, reducing the device manufacturing cost and the finished product preparation cost.

[0018] 3. The present invention can effectively utilize red mud waste to prepare composite catalysts. Using red mud as raw material to prepare composite catalysts can not only reduce costs, but also make rational use of red mud. While reducing the environmental pollution of red mud waste, it can be used to improve the environment and realize the recycling of waste.

[0019] Furthermore, the driving assembly includes a plurality of gear rings, which are all sleeved on the outer wall of the calcining furnace. A plurality of driving members for driving the gear rings to rotate are fixedly connected to the bottom of the base. The output shafts of the driving members are coaxially fixedly connected with gears, and the gears are meshed with adjacent gear rings. The controller is used to control the operation of the driving members.

[0020] Beneficial effect: During the calcining process, the driving member is started by the controller to drive the gear to rotate. Since the gears are meshed with the adjacent gear rings, the gears will drive the gear rings to move. Since the gear rings are sleeved on the outer wall of the calcining furnace, the calcining furnace will rotate with the gear rings, causing all the 8-shaped tubes inside to rotate together, so that the semi-finished products are constantly rolling and flipping during the calcining process, further improving the uniformity of heating, improving the heating efficiency, and then improving the quality of the finished products and the finished product conversion rate.

[0021] Furthermore, the conveying system includes a gas delivery element for inputting inert gas, the gas delivery element is fixedly connected to the side of the conveying box away from the calcining furnace, a control valve is fixedly connected at the connection point between the conveying box and the water heating box, and an input valve is fixedly connected at the connection point between the conveying box and the heating section adjacent to it; the controller is used to control the operation of the gas delivery element, the control valve and the input valve.

[0022] Beneficial effects: When the hydrothermal reaction is completed, the control valve and the input valve are opened by the controller, and the semi-finished product can enter the conveying box from the hydrothermal box; at this time, the gas transmission element is started by the controller, and the gas transmission element will pass inert gas into the conveying box, thereby blowing the semi-finished product into the 8-shaped pipe, and the gas transmission element will continuously output inert gas flow to continuously provide power for the semi-finished product in the calcining furnace until it is transported to the receiving box. At the same time, when the inert gas flows in the 8-shaped pipe, it can promote the heat transfer process in the heating section and help the semi-finished product dissipate heat in the cooling section; this effect helps to improve the heating uniformity of the semi-finished product.

[0023] Furthermore, the mixing assembly includes a stirring rod, a plurality of stirring blades are fixedly connected to the side wall of the stirring rod, and a rotating member for driving the stirring rod to rotate is fixedly connected to the top of the water heating box; the controller is used to control the operation of the rotating member.

[0024] The top wall of the water heating box is fixedly connected with a waterproof box, the waterproof box is sleeved on the outside of the rotating part, and the stirring rod penetrates the waterproof box and rotates with the waterproof box.

[0025] Beneficial effect: After the pure water, red mud and auxiliary materials are added, the rotating part is started through the controller, and the output shaft of the rotating part drives the stirring rod to rotate. At this time, several fan blades will also rotate with the stirring rod, thereby evenly stirring the pure water, red mud and auxiliary materials, laying a good foundation for the subsequent production of finished products.

[0026] The waterproof box can prevent the liquid from intruding into the rotating parts during the stirring process, thereby ensuring the normal operation of the rotating parts.

[0027] Furthermore, a plurality of support frames are fixedly connected to the bottom of the base.

[0028] Beneficial effect: The support frame can provide stable support for the entire device and reduce the shaking of the entire device due to the rotation of the heating furnace.

[0029] Furthermore, the side walls of the cooling section are provided with a plurality of heat dissipation holes, and gas separation membranes are fixedly bonded in the heat dissipation holes. Beneficial effects: The existence of the heat dissipation holes can assist the semi-finished product in dissipating heat, and at the same time, the inert gas flow will flow out through the heat dissipation holes to cool down and dissipate the entire heating furnace, thereby increasing the service life of the entire device.

[0030] The gas separation membrane is a membrane material with selective permeability. It can effectively pass gas while isolating liquids and solids. The gas separation membrane has good toughness, which can effectively prevent semi-finished products from flowing out of the heat dissipation holes.

[0031] Furthermore, a method for treating red mud waste residue comprises the following steps:

[0032] S1, raw material input: red mud and auxiliary materials are put into the water heating box at a ratio of 2:1-3;

[0033] S2, raw material mixing: add pure water into the water heating box at a water-to-material ratio of 2:1-2, and stir the water, red mud and auxiliary materials for 10-15 minutes to obtain a mixture;

[0034] S3, hydrothermal reaction: start the hydrothermal box to heat the mixed material after stirring to 100-200°C for hydrothermal reaction to obtain a semi-finished product;

[0035] S4, calcining of semi-finished products: transporting the semi-finished products to a conveying box, introducing inert gas at room temperature into the conveying box, and transporting the semi-finished products to the heating section and cooling section in each 8-shaped tube in turn for repeated heating, calcining and cooling. The heating temperature gradually increases from 200°C to 1000°C along the conveying direction. After calcination is completed, a finished product is obtained;

[0036] S5, finished product taking: the finished product is output from the output pipe to the receiving box to obtain the finished product.

[0037] Furthermore, in S1, the auxiliary material is any one of bismuth nitrate, zinc sulfate heptahydrate or ginkgo leaf.

[0038] Further, in S3, the inert gas is selected from nitrogen or argon.

[0039] Furthermore, in S4, when the auxiliary material is bismuth nitrate, the finished product obtained after calcination is a red mud-based heterogeneous catalyst; when the auxiliary material is zinc sulfate heptahydrate, the finished product obtained after calcination is a red mud-based ZnFe2O4 composite material; when the auxiliary material is ginkgo leaf, the finished product obtained after calcination is zero-valent iron biochar.

[0040] Beneficial effects: The present invention realizes the resource utilization of red mud waste, converts it into valuable products, and reduces environmental pollution and resource waste. By precisely controlling the raw material ratio, mixing uniformity, hydrothermal reaction conditions and calcination process, the processing efficiency and product quality are improved. The use of inert gas in the calcination process avoids the occurrence of adverse reactions such as oxidation and reduces environmental pollution. Flexible selection of auxiliary materials can produce different finished products. Red mud-based heterogeneous catalysts, red mud-based ZnFe2O4 composite materials and zero-valent iron biochar can all be used for environmental purification.

[0041] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is an axonometric diagram of a red mud waste treatment device in an embodiment of the present invention.

[0043] Figure 2 It is a front view of the red mud waste treatment device in an embodiment of the present invention.

[0044] Figure 3 It is a front cross-sectional view of a red mud waste treatment device in an embodiment of the present invention.

[0045] Figure 4 It is a front cross-sectional view of the heating section in an embodiment of the present invention.

[0046] Figure 5 It is a front cross-sectional view of the cooling section in an embodiment of the present invention.

[0047] Figure 6 Flow chart of the red mud waste treatment method in an embodiment of the present invention.

[0048] The figure marks in the drawings of the specification include: 1. base; 2. conveying box; 201. air pump; 3. water heating box; 301. motor; 302. stirring rod; 303. fan blade; 4. 8-shaped tube; 401. heating wire; 402. heat dissipation hole; 403. arc tube; 5. calcining furnace; 6. gear ring; 601. motor; 7. output pipe; 8. material receiving box; 9. support frame. DETAILED DESCRIPTION

[0049] The following is further described in detail through specific implementation methods:

[0050] Embodiment 1:

[0051] As attached Figure 1-5 As shown, a red mud waste treatment device includes a base 1 and a hydrothermal box 3, a conveying box 2 is welded on the top of the base 1, and the top of the conveying box 2 is connected to the bottom of the hydrothermal box 3 by bolts; the hydrothermal box 3 is electrically connected to a controller, and the controller is used to control the opening and closing of the hydrothermal box 3; a mixing component for mixing raw materials is provided in the hydrothermal box 3; a calcining component for calcining raw materials is connected to the side wall of the conveying box 2; a receiving box 8 is welded on the top of the base 1 away from the conveying box 2.

[0052] A driving assembly for driving the calcining assembly to rotate is arranged outside the calcining assembly, and a conveying system for conveying raw materials is arranged inside the conveying box 2 .

[0053] The calcining assembly comprises a calcining furnace 5, in which a plurality of 8-shaped tubes 4 are welded, each of which comprises a heating section and a cooling section. The heating section is made of a heat-conducting material, and the cooling section is made of a heat-insulating material.

[0054] The heating section close to the conveying box 2 passes through the side wall of the calcining furnace 5 and is connected to the conveying box 2 and rotates together. The cooling section is connected to an arc tube 403 at one end away from the heating section, and the arc tube 403 is connected to the heating section of the adjacent 8-shaped tube 4 at one end away from the cooling section; the arc tube 403 away from the conveying box 2 is connected to the output tube 7, and the output tube 7 passes through the side wall of the calcining furnace 5 and extends to the top of the material receiving box 8 at one end away from the arc tube 403.

[0055] The heating sections are all embedded with heating elements for calcining raw materials. In this embodiment, the heating element is a heating wire 401 . The heating temperature of the heating wire 401 in each heating section along the raw material conveying direction increases successively. The controller is used to control the operation of the heating wire 401 .

[0056] The driving assembly includes a plurality of gear rings 6, which are all sleeved on the outer wall of the calcining furnace 5; a plurality of driving parts for driving the gear rings 6 to rotate are fixedly connected by bolts at the bottom of the base 1, and in this embodiment, the driving parts are motors 601; the output shafts of the motors 601 are fixedly connected with gears with coaxial bolts, and the gears are meshed with adjacent gear rings 6; the controller is used to control the operation of the motors 601.

[0057] The delivery system includes a gas delivery element for inputting inert gas. In this embodiment, the gas delivery element is an air pump 201; the air pump 201 is bolted and connected to the side of the delivery box 2 away from the calcining furnace 5, the delivery box 2 is bolted and connected to the water heating box 3 at the connection point with a control valve, and the delivery box 2 is bolted and connected to the heating section adjacent to it at the connection point with an input valve; the controller is used to control the operation of the air pump 201, the control valve and the input valve.

[0058] The mixing assembly includes a stirring rod 302, a plurality of stirring blades 303 are fixedly connected to the side wall of the stirring rod 302 by bolts, a rotating part for driving the stirring rod 302 to rotate is fixedly connected to the bottom of the water heating box 3 by bolts, and in this embodiment, the rotating part is a motor 301; the output shaft of the motor 301 is fixedly connected to the top of the stirring rod 302 by coaxial bolts, and a controller is used to control the operation of the motor 301.

[0059] The top wall of the water heating box 3 is bolted and fixed with a waterproof box, which is sleeved on the outside of the motor 301. The stirring rod 302 passes through the waterproof box and rotates with the waterproof box. The waterproof box can effectively prevent the liquid from intruding the motor 301 during the stirring process, thereby ensuring the normal operation of the motor 301.

[0060] The specific implementation process is as follows:

[0061] In this embodiment, the auxiliary material is bismuth nitrate.

[0062] Red mud waste and bismuth nitrate are put into the water heating box 3 at a ratio of 1:2, and pure water is added at a water-to-material ratio of 1:1; the motor 301 is started by the controller, and the output shaft of the motor 301 drives the stirring rod 302 to rotate. At this time, the plurality of fan blades 303 will also rotate with the stirring rod 302, so as to evenly stir the pure water, red mud and auxiliary materials to obtain a mixture.

[0063] After the mixing is completed, the controller starts the hydrothermal box 3 to heat the mixed material to 1200° C. to perform a hydrothermal reaction to obtain a semi-finished product.

[0064] When the hydrothermal reaction is completed, the control valve and the input valve are opened by the controller, and the semi-finished product can enter the conveying box 2 from the hydrothermal box 3; at this time, the air pump 201 is started by the controller, and the air pump 201 will introduce inert gas into the conveying box 2, thereby blowing the semi-finished product into the 8-shaped pipe 4, and the air pump 201 will continue to output inert gas to continuously provide power for the semi-finished product in the calcining furnace 5 until it is transported to the receiving box 8.

[0065] At the same time, the controller makes the heating wire 401 start to heat up; the inert gas flow transports the semi-finished product to the heating section and cooling section in each 8-shaped tube 4 in turn for repeated heating, calcining and cooling. The heating temperature gradually increases from 200°C to 1000°C along the conveying direction. After calcination is completed, the finished product is obtained.

[0066] For example, the initial temperature of the semi-finished product is 200℃, the heating temperature of the first heating section is 300℃, and the heating temperature in each subsequent heating section increases by 100℃ along the conveying direction. The heating temperature of the last heating section is 1000℃. When the semi-finished product enters the first heating section, it slides along the heating section driven by the airflow. At the same time, since the heating section is made of heat-conducting materials, the heat generated by the heating section will be transferred to the semi-finished product through heat transfer, thereby heating the semi-finished product; when the semi-finished product enters the cooling section through the heating section, since the cooling section is made of heat-insulating materials, The temperature of this cooling section is lower than that of the heating section. At this time, due to the blowing of inert gas and the temperature difference of the cooling section, the temperature of the semi-finished product will be slightly reduced in the cooling section to avoid a sudden increase in the temperature of the semi-finished product and affect the quality of the finished product; but the temperature of the semi-finished product in the heating section is higher than the temperature of the semi-finished product in the cooling section; the cooled semi-finished product passes through the arc tube 403 into the heating section in the next section of the 8-shaped tube 4 for higher temperature heating, and then passes through the cooling section for cooling; finally, it passes through the last section of the 8-shaped tube 4, and is then sent to the receiving box 8 through the output tube 7 to obtain the finished product.

[0067] In this process, when the inert gas flows in the 8-shaped tube 4, it can promote the heat transfer process in the heating section and help the semi-finished product to dissipate heat in the cooling section; this effect helps to improve the heating uniformity of the semi-finished product.

[0068] The semi-finished product is repeatedly heated and cooled by a plurality of 8-shaped pipes 4, so that the temperature of the semi-finished product is gradually increased, which greatly reduces the problem of poor quality of the semi-finished product and low conversion rate of the finished product due to the sudden temperature rise; and the 8-shaped conveying method can effectively extend the conveying distance of the semi-finished product in the heating furnace of the same length compared with the conveying method of the straight pipe, thereby increasing the heating and cooling time of the semi-finished product and further improving the heating uniformity of the semi-finished product. For example, if the conveying method is a straight pipe, the heating temperature in this heating section may be 300°C, and the semi-finished product has entered the next heating section before it is heated to 300°C, causing the semi-finished product to still be affected by the sudden temperature rise.

[0069] As the temperature inside the device gradually increases, cracking and damage of the device due to excessive temperature differences between adjacent internal areas is avoided, thereby integrating the hydrothermal process and the calcination process, reducing the manufacturing cost of the device and the preparation cost of the finished product.

[0070] The present invention can effectively utilize red mud waste to prepare composite catalysts. Using red mud as raw material to prepare composite catalysts can not only reduce costs, but also make rational use of red mud. While reducing the environmental pollution of red mud waste, it can be used to improve the environment and realize the recycling of waste.

[0071] Embodiment 2:

[0072] As attached Figure 1-3 As shown, the difference from the above embodiment is that a plurality of support frames 9 are welded to the bottom of the base 1 .

[0073] The specific implementation process is as follows: During the preparation process, the support frame 9 can provide stable support for the entire device, reducing the shaking of the entire device due to the rotation of the heating furnace and the stirring of the raw materials.

[0074] Embodiment 3:

[0075] As attached Figure 5 As shown, the difference from the above embodiment is that a plurality of heat dissipation holes 402 are opened on the side walls of the cooling section, and a gas separation membrane is fixedly bonded in the heat dissipation holes 402 .

[0076] The specific implementation process is as follows: during the calcination process, the heat dissipation holes 402 can assist the semi-finished product in dissipating heat, and at the same time, the inert gas flow will flow out through the heat dissipation holes 402 to cool down and dissipate the entire heating furnace, thereby increasing the overall service life of the device.

[0077] The gas separation membrane is a membrane material with selective permeability, which can effectively pass gas while isolating liquid and solid. The gas separation membrane has good toughness, thereby effectively preventing the semi-finished product from flowing out of the heat dissipation hole 402.

[0078] Embodiment 4:

[0079] As attached Figure 1-6 As shown, the difference from the above embodiment is that a method for treating red mud waste residue comprises the following steps:

[0080] S1, raw material input: red mud and auxiliary materials are input into the water heating box 3 at a ratio of 1:2;

[0081] S2, raw material mixing: add pure water to the water heating box 3 at a water-to-material ratio of 1:1, and stir the pure water, red mud and auxiliary materials for 15 minutes to obtain a mixture;

[0082] S3, hydrothermal reaction: start the hydrothermal box 3, heat the mixed material after stirring to 200°C, perform hydrothermal reaction, and obtain a semi-finished product;

[0083] S4, calcining the semi-finished product: the semi-finished product is transported to the conveying box 2, and an inert gas at room temperature is introduced into the conveying box 2. At the same time, the semi-finished product is sequentially transported to the heating section and cooling section in each 8-shaped tube 4 for repeated heating, calcining and cooling. The heating temperature gradually increases from 200° C. to 1000° C. along the conveying direction. After the calcination is completed, the finished product is obtained;

[0084] S5, finished product taking: the finished product is output from the output pipe 7 to the receiving box 8 to obtain the finished product.

[0085] In S1, the auxiliary material is any one of bismuth nitrate, zinc sulfate heptahydrate or ginkgo leaf.

[0086] In S3, the inert gas is either nitrogen or argon.

[0087] In S4, when the auxiliary material is bismuth nitrate, the finished product obtained after calcination is a red mud-based heterogeneous catalyst; when the auxiliary material is zinc sulfate heptahydrate, the finished product obtained after calcination is a red mud-based ZnFe2O4 composite material; when the auxiliary material is ginkgo leaves, the finished product obtained after calcination is zero-valent iron biochar.

[0088] The specific implementation process is as follows:

[0089] In this embodiment, bismuth nitrate is selected as the auxiliary material, and nitrogen is selected for purging.

[0090] Red mud and auxiliary material bismuth nitrate are added into the hydrothermal box 3 at a ratio of 1:2, and pure water is added into the hydrothermal box 3 at a water-to-material ratio of 1:1. The water, red mud and bismuth nitrate are fully stirred using the starting stirring rod 302 and the stirring blade 303. The stirring time is 15 minutes to obtain a uniform mixture.

[0091] After the mixing is completed, the hydrothermal box 3 is started to heat the mixed material after the stirring is completed, and the temperature is controlled between 100 and 200° C. to perform a hydrothermal reaction to obtain a semi-finished product.

[0092] The semi-finished product is transported to the conveying box 2, and nitrogen at room temperature is introduced into the conveying box 2. At the same time, the semi-finished product is sequentially transported to the heating section and cooling section in each 8-shaped tube 4 for repeated heating, calcination and cooling. The heating temperature gradually increases from 200°C to 1000°C along the conveying direction until the calcination is completed and the finished product is obtained. Finally, the calcined finished product is output from the output pipe 7 to the receiving box 8 to obtain the finished product.

[0093] The present invention realizes the resource utilization of red mud waste residue, converts it into valuable products, and reduces environmental pollution and resource waste. By controlling the raw material ratio, mixing uniformity, hydrothermal reaction conditions and calcination process, the processing efficiency and product quality of red mud are improved. The use of inert gas avoids the occurrence of adverse reactions such as oxidation, and reduces environmental pollution.

[0094] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A red mud waste treatment device, comprising a base (1) and a water heating box (3), characterized in that: The top of the base (1) is fixedly connected to a delivery box (2), and the top of the delivery box (2) is fixedly connected to the bottom of a water heating box (3); the water heating box (3) is electrically connected to a controller, and the controller is used to control the opening and closing of the water heating box (3); A mixing assembly for mixing raw materials is provided in the water heating box (3); a calcining assembly for calcining raw materials is connected to the side wall of the conveying box (2); a material receiving box (8) is fixedly connected to the top of the base (1) away from the conveying box (2); A driving assembly for driving the calcining assembly to rotate is arranged outside the calcining assembly, and a conveying system for conveying raw materials is arranged inside the conveying box (2); The calcining assembly comprises a calcining furnace (5), wherein a plurality of 8-shaped tubes (4) are fixedly connected inside the calcining furnace (5), wherein the 8-shaped tubes (4) each comprise a heating section and a cooling section, wherein the heating section is made of a heat-conducting material, and the cooling section is made of a heat-insulating material; The heating section near the conveying box (2) penetrates the side wall of the calcining furnace (5) and is connected to the conveying box (2) and rotatably cooperates therewith; the cooling section is connected to an arc-shaped tube (403) at one end away from the heating section; the arc-shaped tube (403) is connected to the heating section of the adjacent 8-shaped tube (4) at one end away from the cooling section; the arc-shaped tube (403) is connected to an output tube (7) at one end away from the conveying box (2); the output tube (7) penetrates the side wall of the calcining furnace (5) and extends to the top of the material receiving box (8); Heating elements for calcining raw materials are installed in each heating section, and the heating temperature in each heating section along the raw material conveying direction increases successively; the controller is used to control the operation of the heating elements.

2. The red mud waste treatment device according to claim 1, characterized in that: The driving assembly comprises a plurality of gear rings (6), and the gear rings (6) are all sleeved on the outer wall of the calcining furnace (5); a plurality of driving members for driving the gear rings (6) to rotate are fixedly connected to the bottom of the base (1), and the output shafts of the driving members are all coaxially fixedly connected with gears, and the gears are all meshed with adjacent gear rings (6); and the controller is used to control the operation of the driving members.

3. The red mud waste treatment device according to claim 2, characterized in that: The delivery system comprises a gas delivery element for inputting inert gas, the gas delivery element being fixedly connected to a side of a delivery box (2) away from a calcining furnace (5), a control valve being fixedly connected to a connection point between the delivery box (2) and a water heating box (3), and an input valve being fixedly connected to a connection point between the delivery box (2) and a heating section adjacent thereto; and a controller being used to control the operation of the gas delivery element, the control valve and the input valve.

4. The red mud waste treatment device according to claim 3, characterized in that: The mixing assembly comprises a stirring rod (302), a plurality of stirring blades (303) are fixedly connected to the side wall of the stirring rod (302), and a rotating member for driving the stirring rod (302) to rotate is fixedly connected to the top of the water heating box (3); the controller is used to control the operation of the rotating member; The top wall of the water heating box (3) is fixedly connected with a waterproof box, which is sleeved on the outside of the rotating member, and the stirring rod (302) penetrates the waterproof box and rotates in coordination with the waterproof box.

5. The red mud waste treatment device according to claim 4, characterized in that: A plurality of support frames (9) are fixedly connected to the bottom of the base (1).

6. The red mud waste treatment device according to claim 5, characterized in that: The side walls of the cooling section are each provided with a plurality of heat dissipation holes (402), and a gas separation membrane is fixedly connected in each of the heat dissipation holes (402).

7. A method for treating red mud waste residue, based on the red mud waste residue treatment device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, raw material input: red mud and auxiliary materials are input into the water heating box (3) at a ratio of 2:1-3; S2, raw material mixing: adding pure water to the water heating box (3) at a water-to-material ratio of 2:1-2, and stirring the pure water, red mud and auxiliary materials for 10-15 minutes to obtain a mixture; S3, hydrothermal reaction: start the hydrothermal box (3), heat the stirred mixture to 100-200°C, perform hydrothermal reaction, and obtain a semi-finished product; S4, calcining the semi-finished product: conveying the semi-finished product into a conveying box (2), introducing an inert gas at room temperature into the conveying box (2), and conveying the semi-finished product to the heating section and cooling section in each 8-shaped tube (4) in sequence for repeated heating, calcining and cooling, with the heating temperature gradually increasing from 200° C. to 1000° C. along the conveying direction. After the calcination is completed, a finished product is obtained; S5, finished product collection: the finished product is discharged from the output pipe (7) into the receiving box (8) to obtain the finished product.

8. The method for treating red mud waste according to claim 7, characterized in that: In S1, the auxiliary material is any one of bismuth nitrate, zinc sulfate heptahydrate or ginkgo leaf.

9. The method for treating red mud waste according to claim 8, characterized in that: In S3, the inert gas is either nitrogen or argon.

10. The method for treating red mud waste according to claim 9, characterized in that: In S4, when the auxiliary material is bismuth nitrate, the finished product obtained after calcination is a red mud-based heterogeneous catalyst; when the auxiliary material is zinc sulfate heptahydrate, the finished product obtained after calcination is a red mud-based ZnFe2O4 composite material; when the auxiliary material is ginkgo leaves, the finished product obtained after calcination is zero-valent iron biochar.

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