Calcination device for processing modified bentonite

Abstract

The utility model discloses a calcining device for processing modified bentonite, which belongs to the technical field of bentonite calcining and comprises a calcining component, a stirring component is arranged at the top end of the calcining component, and a magnetic field gradient component is arranged outside the calcining component. The number of layers is 3-5, the flowing speed of cooling water is 2-5 L / min, the water temperature is lower than 25 DEG C, overheating is prevented, the outer layer is a permanent magnet array neodymium iron boron magnet arranged in the radial direction, a plurality of strip-shaped neodymium iron boron magnets are adopted and fixed to a shell through a stainless steel protection shell, the induction magnetic field intensity is changed by adjusting the current of an electromagnetic coil to be 0-10 A, and the induction magnetic field intensity is overlapped with a permanent magnet inherent magnetic field; according to the present invention, the magnetic medium such as Fe3O4 particles can obtain enough energy at the material inlet, the temperature can be rapidly increased to the target temperature such as 300-500 DEG C so as to achieve efficient heat transfer, and the process requirements such as the switching of the calcination curves of different bentonite varieties can be rapidly responded within 10 seconds by adjusting the current of the electromagnetic coil to 0-10 A;

Description

A calcination apparatus for processing modified bentonite Technical Field

[0001] This utility model relates to the field of bentonite calcination, and more specifically, to a calcination apparatus for processing modified bentonite. Background Technology

[0002] Calcination for modified bentonite processing refers to the process of physically or chemically modifying bentonite through high-temperature treatment to improve its properties such as adsorption capacity, thermal stability, and ion exchange capacity, thereby meeting the needs of different industrial applications. Bentonite is a clay mineral with montmorillonite as its main component, possessing properties such as water absorption and swelling, colloidal dispersion, and ion exchange capacity. However, its natural properties are often affected by impurities such as quartz, feldspar, and the type of interlayer cations in montmorillonite, such as Na+. + Ca 2+ Due to limitations such as these factors, modification and optimization are necessary.

[0003] However, traditional technologies rely on external heat conduction, such as heat transfer through the rotary kiln wall and radiative heat transfer through the box furnace. Heat needs to be transferred to the material gradually through the equipment wall, resulting in thermal lag. They also rely on traditional energy sources such as coal and natural gas, leading to significant heat loss, such as heat dissipation from the rotary kiln body and heat carried away by flue gas. The energy consumption per unit product is as high as 800-1200 kJ / kg. Intermittent operation, such as box furnaces, requires repeated heating and cooling, further increasing energy consumption and production costs. Rotary kilns and other equipment also suffer from problems such as easy wear of mechanical transmission components, such as rollers and gears, and severe material back-mixing, especially in straight-cylinder fluidized beds. Maintenance cycles are short, usually requiring repairs every 1-2 months, resulting in high downtime costs. Intermittent operation, such as box furnaces, requires manual feeding and unloading, resulting in low automation. The capacity of small and medium-sized units is usually <5t / h, which is difficult to meet the needs of large-scale production.

[0004] Therefore, a calcination apparatus for processing modified bentonite is proposed to address the above problems. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a calcination device for processing modified bentonite. The device has no complex mechanical transmission parts, low wear, and a modular design for easy maintenance of the composite magnetic field generator. The magnetic medium and permanent magnet have long service life and long maintenance cycle, reducing downtime costs and maintenance frequency.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A calcination apparatus for processing modified bentonite includes a calcination component, a stirring component at the top of the calcination component, and a magnetic field gradient component on the outside of the calcination component. The calcination component includes a shell, an electromagnetic coil is fixedly connected inside the shell, an inner cylinder is adapted inside the electromagnetic coil, and the top of the inner cylinder penetrates the top of the shell and is fixedly connected to a lug adapted to the shell.

[0008] Furthermore, a driving component electrically connected to the electromagnetic coil is fixedly connected to the left end of the housing.

[0009] Furthermore, a coolant housing is fixedly connected to the right end of the outer shell, a water pump is connected to the top of the coolant housing, and a cooling metal pipe adapted to the electromagnetic coil is connected to the output end of the water pump.

[0010] Furthermore, the stirring assembly includes a protective cover adapted to the lug, a motor is fixedly connected inside the protective cover, a shaft is fixedly connected to the drive end of the motor and rotatably connected to the protective cover, and the bottom end of the shaft passes through the bottom end of the protective cover and is fixedly connected to a plurality of equidistant stirring blades adapted to the inner cylinder.

[0011] Furthermore, the magnetic field gradient component includes multiple equidistant stainless steel protective shells that are fixedly connected to the outer shell, and permanent magnets are fixedly connected inside the stainless steel protective shells.

[0012] Furthermore, the outer wall of the outer shell has an opening corresponding to the stainless steel protective shell.

[0013] Furthermore, the end of the cooling metal pipe furthest from the water pump is connected to the coolant housing.

[0014] In summary, this utility model has the following beneficial effects:

[0015] (1) This scheme uses a spiral electromagnetic coil wound in a hollow copper tube with an inner diameter of φ200-500mm and 3-5 layers. The cooling water flow rate is 2-5L / min and the water temperature is <25℃ to prevent overheating. The outer layer is a radially arranged permanent magnet array of neodymium iron boron magnets. Multiple strip neodymium iron boron magnets are fixed to the outer shell by a stainless steel protective shell. By adjusting the electromagnetic coil current 0-10A, the strength of the induced magnetic field is changed and superimposed with the inherent magnetic field of the permanent magnet. This ensures that the magnetic medium, such as Fe3O4 particles, obtains sufficient energy at the material inlet and quickly heats up to the target temperature, such as 300-500℃, to achieve efficient heat transfer. By adjusting the electromagnetic coil current 0-10A, it can quickly respond to process requirements within 10 seconds, such as switching the calcination curve of different bentonite varieties. The temperature control accuracy reaches ±2℃, which is far greater than the error of ±5℃ of the traditional single magnetic field system.

[0016] (2) This solution uses a composite magnetic field generator with no complex mechanical transmission parts, low wear, and modular design, which is easy to maintain. The magnetic medium and permanent magnet have long service life and long maintenance cycle, reducing downtime costs and maintenance frequency. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the overall structure in this embodiment;

[0018] Figure 2 is a schematic diagram of the overall disassembled structure in this embodiment;

[0019] Figure 3 is a schematic diagram of the overall cross-section in this embodiment;

[0020] Figure 4 is a schematic diagram of the cross-section of the magnetic field gradient component in this embodiment.

[0021] In the diagram, 1 is the calcination assembly; 2 is the stirring assembly; 3 is the magnetic field gradient assembly; 101 is the outer shell; 102 is the driving component; 103 is the electromagnetic coil; 104 is the coolant shell; 105 is the water pump; 106 is the cooling metal pipe; 107 is the inner cylinder; 108 is the hanging lug; 201 is the protective cover; 202 is the motor; 203 is the shaft; 204 is the stirring blade; 301 is the stainless steel protective shell; and 302 is the permanent magnet. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings.

[0023] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific part, respectively.

[0024] Referring to Figures 1-4, a calcination device for processing modified bentonite according to a preferred embodiment of the present invention includes a calcination component 1, a stirring component 2 is provided at the top of the calcination component 1, and a magnetic field gradient component 3 is provided on the outside of the calcination component 1; the calcination component 1 includes a shell 101, an electromagnetic coil 103 is fixedly connected inside the shell 101, an inner cylinder 107 is adapted inside the electromagnetic coil 103, and the top of the inner cylinder 107 penetrates the top of the shell 101 and is fixedly connected to a lug 108 adapted to the shell 101.

[0025] A drive component 102, which is electrically connected to the electromagnetic coil 103, is fixedly connected to the left end of the housing 101.

[0026] A coolant housing 104 is fixedly connected to the right end of the outer casing 101. A water pump 105 is connected to the top of the coolant housing 104. A cooling metal pipe 106, which is coiled around the outer wall of the inner cylinder 107 and is adapted to the electromagnetic coil 103, is connected to the output end of the water pump 105.

[0027] In this scheme, the electromagnetic coil 103 generates a variable magnetic field through the power supply of the driving component 102, and the permanent magnet 302 releases a constant magnetic field. The two are superimposed through the opening of the outer shell 101 to form an axial gradient magnetic field with a bottom temperature of 0.5-1.0T and a top temperature of 0.2-0.4T. This magnetic field causes the magnetic medium such as Fe3O4 particles in the inner cylinder 107 to heat up to 300-500℃ due to magnetic hysteresis loss, realizing direct heating of the bentonite raw material by the internal heat source. This solves the problems of thermal hysteresis and uneven heating in traditional external heating systems, and significantly improves the heat transfer efficiency and temperature uniformity with a temperature control accuracy of ±2℃.

[0028] The stirring assembly 2 includes a protective cover 201 adapted to the lug 108. A motor 202 is fixedly connected inside the protective cover 201. A shaft 203 rotatably connected to the transmission end of the motor 202 is fixedly connected to the protective cover 201. The bottom end of the shaft 203 passes through the bottom end of the protective cover 201 and is fixedly connected to a plurality of equidistant stirring blades 204 adapted to the inner cylinder 107.

[0029] This solution uses a motor 202 to drive the shaft 203 to rotate, which in turn drives the stirring blade 204 to rotate, so that the bentonite raw material is fully mixed and fluidized with the high-temperature magnetic medium. On the one hand, it enhances the heat and mass transfer process, and on the other hand, it prevents material agglomeration, ensuring that the material rises in a spiral shape in the cylinder, prolonging the residence time and distributing it evenly. The residence time distribution variance is <5%, and the powder dispersion is improved by 20% after calcination, with a D50 particle size error of <5μm.

[0030] The magnetic field gradient component 3 includes multiple equidistant stainless steel protective shells 301 that are fixedly connected to the outer shell 101, and permanent magnets 302 are fixedly connected inside the stainless steel protective shells 301.

[0031] The outer wall of the outer casing 101 is provided with an opening corresponding to the stainless steel protective casing 301;

[0032] This solution encapsulates the permanent magnet 302 within the enclosure. On one hand, it isolates the permanent magnet from the high temperature (<80℃) to prevent demagnetization due to excessive temperature. The Curie temperature of NdFeB is 310℃, and the operating temperature must be <80℃. On the other hand, it shields the magnetic field from leakage, ensuring that the external magnetic field strength of the equipment is <0.05T, which is a safety standard limit, thus improving the safety of the equipment.

[0033] The end of the cooling metal pipe 106 away from the water pump 105 is connected to the coolant housing 104.

[0034] The specific implementation process is as follows: First, the driving component 102 inputs a 0-10A current to the electromagnetic coil 103, causing it to generate an adjustable magnetic field. Simultaneously, inside the stainless steel protective shell 301 on the outer wall of the outer shell 101, the permanent magnet 302 releases a constant magnetic field with a residual magnetism of 1.2-1.4T. The magnetic medium, such as Fe3O4 particles, inside the inner cylinder 107 generates hysteresis loss in the gradient magnetic field, self-heating to 300-500℃. At the same time, the motor 202 of the stirring assembly 2 drives the shaft 203 and the stirring blade 204 to rotate, pushing the bentonite raw material and the high-temperature magnetic medium to fully mix and fluidize, realizing direct heat transfer from the internal heat source and avoiding the thermal hysteresis problem of traditional external heating. The water pump 105 pumps the coolant from the coolant shell 104, and through the cooling metal pipe 106 coiled on the outer wall of the inner cylinder 107, it carries away the heat generated by the operation of the electromagnetic coil 103. The cooling water flow rate is 2-5L / min, and the water temperature is <25℃ to prevent the coil from overheating. Adjusting the current intensity of the electromagnetic coil 103 allows for rapid adjustment of the magnetic field intensity within 10 seconds, thereby changing the heat generation of the magnetic medium and achieving a temperature control accuracy of ±2℃. This meets the differentiated calcination requirements of different bentonite varieties, such as calcium-based bentonite requiring activation at 400℃ and sodium-based bentonite requiring dehydroxylation at 500℃. The rotation of the stirring blade 204 causes the material to rise in a spiral shape. Combined with the "strong fluidization at the bottom and stable suspension at the top" characteristics of the gradient magnetic field, particle agglomeration is suppressed, ensuring that the variance of the material residence time distribution is <5%, and the powder dispersion is increased by 20% after calcination, with a D50 particle size error of <5μm. The inner cylinder 107 is detachably connected to the outer shell 101 via the lugs 108, facilitating the cleaning of material residue. The permanent magnet 302 of the magnetic field gradient component 3 is independently encapsulated in the stainless steel protective shell 301, which can be disassembled separately during maintenance, avoiding the complex maintenance process of the traditional integrated structure and extending the maintenance cycle from 1-2 months in the traditional technology to 6-12 months.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A calcination apparatus for processing modified bentonite, comprising a calcination component (1), characterized in that: The top of the calcination assembly (1) is provided with a stirring assembly (2), and the outside of the calcination assembly (1) is provided with a magnetic field gradient assembly (3); the calcination assembly (1) includes a shell (101), an electromagnetic coil (103) is fixedly connected inside the shell (101), an inner cylinder (107) is adapted inside the electromagnetic coil (103), and the top of the inner cylinder (107) penetrates the top of the shell (101) and is fixedly connected with a hanging ear (108) adapted to the shell (101).

2. The calcination apparatus for processing modified bentonite according to claim 1, characterized in that: The left end of the outer casing (101) is fixedly connected to a driving component (102) that is electrically connected to the electromagnetic coil (103).

3. The calcination apparatus for processing modified bentonite according to claim 2, characterized in that: A coolant housing (104) is fixedly connected to the right end of the outer shell (101). A water pump (105) is connected to the top end of the coolant housing (104). The output end of the water pump (105) is connected to a cooling metal pipe (106) that is coiled around the outer wall of the inner cylinder (107) and adapted to the electromagnetic coil (103).

4. The calcination apparatus for processing modified bentonite according to claim 1, characterized in that: The stirring assembly (2) includes a protective cover (201) adapted to the lug (108). A motor (202) is fixedly connected inside the protective cover (201). The transmission end of the motor (202) is fixedly connected to a shaft (203) rotatably connected to the protective cover (201). The bottom end of the shaft (203) passes through the bottom end of the protective cover (201) and is fixedly connected to a plurality of equidistant stirring blades (204) adapted to the inner cylinder (107).

5. The calcination apparatus for processing modified bentonite according to claim 1, characterized in that: The magnetic field gradient component (3) includes a plurality of equidistant stainless steel protective shells (301) that are fixedly connected to the outer shell (101), and a permanent magnet (302) is fixedly connected inside the stainless steel protective shell (301).

6. The calcination apparatus for processing modified bentonite according to claim 5, characterized in that: The outer wall of the outer shell (101) has an opening corresponding to the stainless steel protective shell (301).

7. The calcination apparatus for processing modified bentonite according to claim 3, characterized in that: The end of the cooling metal pipe (106) away from the water pump (105) is connected to the coolant housing (104).

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