Auxiliary heating furnace for electrolytic bath

Abstract

An auxiliary heating furnace for an electrolytic bath belongs to the technical field of auxiliary equipment in the molten salt electrolysis production process and comprises a furnace cover, the furnace cover is arranged on the outer side wall of the electrolytic bath by a circle and composed of a plurality of furnace cover units, one side of each furnace cover unit is fixedly connected with a driving rotating shaft, and the furnace cover units are annularly arranged with the electrolytic bath as the center. When the furnace cover unit is closed, the furnace cover unit surrounds the outer side wall of the electrolytic bath by a circle, a plurality of heating devices are arranged on the side, facing the electrolytic bath, of the furnace cover, heat preservation cotton is arranged between the heating devices and the furnace cover, a temperature measuring device is arranged on the furnace cover, and the driving rotating shaft and the heating devices are connected with a power cabinet. The auxiliary heating furnace capable of being opened and closed is arranged on the periphery of the electrolytic bath, cold-state materials in the electrolytic bath are heated and melted in an electric heating mode, and dynamic balance of energy in the production process is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of auxiliary equipment in a molten salt electrolysis production process, and in particular relates to an auxiliary heating furnace for an electrolytic cell. Background Art

[0002] Since the development of the molten salt electrolysis process for preparing metals for nearly 200 years, it has played a pivotal role in the extraction of metals such as aluminum, calcium, beryllium, lithium, sodium, thorium, niobium, zirconium, tantalum, and rare earths. In existing production processes, such as lithium and sodium molten salt refining processes, the electrolyte is often melted in advance by a melting furnace before starting the cell, and then added to the electrolytic cell and powered on to start the electrolytic cell. For this purpose, a separate melting furnace equipment area needs to be set up, and the liquid molten salt needs to be transferred before it can be added to the electrolytic cell. The transfer operation requires a large amount of manpower and material resources, and there is a certain risk of high temperature. In addition, during the normal production process of the electrolytic cell, operations such as pole replacement and feeding are required. During the operation, energy loss and material input often destroy the energy balance of the original electrolytic cell. Summary of the invention

[0003] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an auxiliary heating furnace for an electrolytic cell, which adds auxiliary heating facilities to the existing electrolytic cell, transforms the existing production operation process, replaces the existing material furnace, simplifies the operation steps, and can also specifically adjust the energy balance of the electrolytic cell during the production process to maintain normal production.

[0004] In order to achieve the above object, the main technical solutions adopted by the present invention include: An auxiliary heating furnace for an electrolytic cell comprises a furnace hood, which is arranged around the outer wall of the electrolytic cell. The furnace hood is composed of a plurality of furnace hood units, one side of each furnace hood unit is fixedly connected to a driving rotating shaft, and the plurality of furnace hood units are arranged in a ring with the electrolytic cell as the center. When the furnace hood units are closed, the furnace hood units surround the outer wall of the electrolytic cell. A plurality of heating devices are arranged on the side of the furnace hood facing the electrolytic cell, and heat insulation cotton is arranged between the heating device and the furnace hood. A temperature measuring device is arranged on the furnace hood, and the driving rotating shaft and the heating device are connected to a power cabinet.

[0005] Furthermore, the furnace hood is composed of two or more furnace hood units, the height of the furnace hood unit matches the height of the outer wall of the electrolytic cell, and several furnace hood units are surrounded by the outer wall of the electrolytic cell. After the furnace hood unit is closed, the furnace hood is completely covered by the outer wall of the electrolytic cell, and the rotation angle of the furnace hood unit is 0-120°.

[0006] Further, when there are two furnace cover units, the furnace cover units are semicircular, and the driving rotating shaft is fixedly connected to the same side or adjacent side ends of each furnace cover unit.

[0007] Furthermore, when there are more than two furnace cover units, the furnace cover units are arc-shaped, and the driving rotating shaft is fixedly connected to the same side or adjacent side ends of each furnace cover unit.

[0008] Furthermore, the heating device is a heating rod, each furnace cover unit is provided with a plurality of heating rods, and the outside of the heating rod is provided with an insulating ceramic sleeve.

[0009] Furthermore, the heating rod is vertically arranged parallel to the outer side wall of the electrolytic cell, and a plurality of heating rods are evenly distributed around the outer side wall of the electrolytic cell.

[0010] Furthermore, the plurality of heating rods are connected to each other via electrical wires, and the wire connection between the plurality of heating rods is a star connection or a triangle connection.

[0011] Furthermore, the furnace cover unit and the driving rotating shaft are fixed on a base, and a guiding device for the furnace cover unit to move is provided between the bottom of the furnace cover unit and the base.

[0012] Furthermore, the power of the heating furnace is: In the formula: P is the power required by the electric heater, kW; C is the specific heat of the heated medium, kcal / (kg•℃); M is the mass of the heated medium, kg; ΔT is the difference between the set temperature and the initial temperature in ℃; t is the time required to heat the medium from the initial temperature to the set temperature, h; S is the safety factor.

[0013] The beneficial effects of the present invention are: The auxiliary heating furnace for the electrolytic cell of the present invention heats and melts the cold material in the electrolytic cell by means of electric heating by setting an openable auxiliary heating furnace outside the electrolytic cell, thereby changing the traditional cell opening method, workshop layout and operation system. At the same time, the heating furnace is used to further compensate for the extra heat required for the pole changing, material discharging and material adding processes in production, effectively ensuring the dynamic balance of energy in the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the auxiliary heating furnace for the electrolytic cell when the furnace cover unit is opened and closed in the same direction in the present invention; Figure 2 It is a structural schematic diagram of an auxiliary heating furnace for a furnace cover unit split type electrolytic cell in the present invention; Figure 3 This is the star wiring diagram of the heating rod; Figure 4 This is a schematic diagram of the triangle wiring of the heating rod.

[0015] In the figure: 1. furnace cover, 2. thermal insulation cotton, 3. heating rod, 4. insulating ceramic sleeve, 5. power connection wire, 6. temperature measuring thermocouple, 7. furnace cover guide rail, 8. welding bolt, 9. gasket, 10. nut, 11. power cabinet, 12. driving cylinder, 13. electrolytic cell. DETAILED DESCRIPTION

[0016] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0017] The present invention provides an auxiliary heating furnace for an electrolytic cell, such as Figure 1-2 As shown, it includes a furnace cover 1, which is arranged around the outer wall of the electrolytic cell 13. The furnace cover 1 is composed of a plurality of furnace cover units, one side of each furnace cover unit is fixedly connected to the driving rotating shaft, and the plurality of furnace cover units are arranged in a ring around the electrolytic cell 13. When the furnace cover unit is closed, it surrounds the outer wall of the electrolytic cell 13. The furnace cover is provided with a plurality of heating devices on the side facing the electrolytic cell 13. Insulation cotton 2 is provided between the heating device and the furnace cover. The furnace cover is provided with a temperature measuring device, which can be a temperature measuring thermocouple 6, for monitoring the heating temperature of the heating furnace. The driving rotating shaft and the heating device are connected to the power cabinet 11.

[0018] Specifically, the furnace hood 1 is composed of two or more furnace hood units, the height of the furnace hood unit matches the height of the outer wall of the electrolytic cell 13, and a plurality of furnace hood units surround the outer wall of the electrolytic cell 13. After the furnace hood unit is closed, the furnace hood 1 is completely covered by the outer wall of the electrolytic cell 13, and the electrolytic cell 13 is completely placed inside the part surrounded by the furnace hood 1. The rotation angle of the furnace hood unit is 0-120°. More specifically, when there are two furnace hood units, the furnace hood units are in the form of two semicircles, and two driving rotating shafts are vertically arranged and fixedly connected to the same side or adjacent side ends of each furnace hood unit. When the two driving rotating shafts are respectively connected to the same side of each furnace hood unit, as shown in FIG. Figure 1 As shown in FIG. 1 , the furnace cover unit is opened in the same direction. When two driving rotating shafts are connected to the adjacent sides of each furnace cover unit, as shown in FIG. Figure 2As shown, the furnace hood unit is opened in a split-opening manner. The driving rotating shaft can be a driving cylinder 12 connected to the rotating shaft to realize the driving of the rotating shaft. When there are more than two furnace hood units, the furnace hood units are arc-shaped, and the driving rotating shaft is fixedly connected to the same side or adjacent side ends of each furnace hood unit, respectively, to form a multi-petal furnace hood unit structure, and the opening manner of the two connected furnace hood units can be split-opening or opening and closing in the same direction. The furnace hood unit and the driving rotating shaft are fixed on a base. In order to make the furnace hood unit open and close stably, a guide device for the furnace hood unit to move can be provided between the bottom of the furnace hood unit on one side away from the driving rotating shaft and the base. Specifically, the guide device can be a protrusion provided at the bottom of the furnace hood unit on one side away from the driving rotating shaft, and a slideway matched with the protrusion is provided on the base to realize the smooth opening and closing of the furnace hood unit.

[0019] Specifically, a plurality of heating rods 3 are provided on one side of the furnace cover unit close to the electrolytic cell 13. The heating rods 3 are vertically arranged parallel to the outer wall of the electrolytic cell 13. The plurality of heating rods 3 are evenly distributed around the outer wall of the electrolytic cell 13. The heating rods 3 are externally sleeved with insulating ceramic sleeves 4. The heating rods 3 pass through the insulating ceramic sleeves 4 and are clamped on the furnace cover 1. The plurality of heating rods 3 are connected to each other through electrical wires 5. Figure 3 As shown, the wire connection between the plurality of heating rods 3 is a star connection, such as Figure 4 As shown, or a triangle connection.

[0020] Specifically, the thermal insulation cotton 2 is pressed onto the inner wall of the furnace hood 1 by means of welding bolts 8 , washers 9 , and nuts 10 .

[0021] Specifically, the power of the heating furnace is: In the formula: P is the power required by the electric heater, kW; C is the specific heat of the heated medium, kcal / (kg•℃); M is the mass of the heated medium, kg; ΔT is the difference between the set temperature and the initial temperature in ℃; t is the time required to heat the medium from the initial temperature to the set temperature, h; S is the safety factor.

[0022] The operation process of the auxiliary heating furnace for the electrolytic cell of the present invention is as follows: before the electrolytic cell 13 is started, a predetermined amount of cold electrolyte is first added into the heating furnace of the electrolytic cell 13. The furnace cover 1 of the auxiliary heating furnace is closed, and the power is turned on to increase the temperature. After the electrolyte in the electrolytic cell 13 is heated and melted, the auxiliary heating furnace is switched to the heat preservation state, the electrolytic cell 13 is powered on and started, and gradually increases to the required production intensity, and then the auxiliary heating furnace is closed.

[0023] When the electrolytic cell 13 is changing poles, adding materials, and discharging materials, the auxiliary heating furnace is started to heat and replenish energy for the electrolytic cell 13 according to the production temperature requirements. In addition, when the temperature in the electrolytic cell 13 exceeds the normal production, the furnace cover 1 of the auxiliary heating furnace can be opened to dissipate heat to maintain the temperature required for normal production of the electrolytic cell 13.

[0024] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Alterations, modifications, substitutions and variations of the above embodiments by a person skilled in the art are all within the scope of the present invention.

Claims

1. An auxiliary heating furnace for an electrolytic cell, characterized in that: The invention comprises a furnace cover (1), wherein the furnace cover (1) is arranged around the outer wall of the electrolytic cell, the furnace cover (1) is composed of a plurality of furnace cover units, one side of each furnace cover unit is fixedly connected to a driving rotating shaft, and the plurality of furnace cover units are arranged in a ring with the electrolytic cell as the center. When the furnace cover units are closed, the furnace cover units surround the outer wall of the electrolytic cell. A plurality of heating devices are arranged on the side of the furnace cover (1) facing the electrolytic cell, and heat insulation cotton (2) is arranged between the heating device and the furnace cover (1). A temperature measuring device is arranged on the furnace cover (1), and the driving rotating shaft and the heating device are connected to a power cabinet (11).

2. The auxiliary heating furnace for an electrolytic cell according to claim 1, characterized in that: The furnace hood (1) is composed of two or more furnace hood units, the height of the furnace hood units matches the height of the outer wall of the electrolytic cell, and a plurality of furnace hood units surround the outer wall of the electrolytic cell. When the furnace hood units are closed, the furnace hood (1) completely covers the outer wall of the electrolytic cell, and the rotation angle of the furnace hood units is 0-120°.

3. The auxiliary heating furnace for an electrolytic cell according to claim 2, characterized in that: When there are two furnace hood units, the furnace hood units are semicircular, and the driving rotating shaft is fixedly connected to the same side or adjacent side ends of each furnace hood unit.

4. The auxiliary heating furnace for an electrolytic cell according to claim 2, characterized in that: When there are more than two furnace cover units, the furnace cover units are arc-shaped, and the driving rotating shaft is fixedly connected to the same side or adjacent side ends of each furnace cover unit.

5. The auxiliary heating furnace for an electrolytic cell according to claim 1, characterized in that: The heating device is a heating rod (3), each furnace cover unit is provided with a plurality of heating rods (3), and the heating rods (3) are externally sheathed with an insulating ceramic sleeve (4).

6. The auxiliary heating furnace for an electrolytic cell according to claim 5, characterized in that: The heating rod (3) is arranged vertically parallel to the outer side wall of the electrolytic cell, and a plurality of heating rods (3) are evenly distributed around the outer side wall of the electrolytic cell.

7. The auxiliary heating furnace for an electrolytic cell according to claim 5, characterized in that: The plurality of heating rods (3) are connected to each other via power connection wires (5), and the connection mode of the wires between the plurality of heating rods (3) is a star connection or a triangle connection.

8. The auxiliary heating furnace for an electrolytic cell according to claim 1, characterized in that: The furnace cover unit and the driving rotating shaft are fixed on a base, and a guiding device for the furnace cover unit to move is arranged between the bottom of the furnace cover unit and the base.

9. The auxiliary heating furnace for an electrolytic cell according to claim 1, characterized in that: The heating furnace power is: In the formula: P is the power required by the electric heater, kW; C is the specific heat of the heated medium, kcal / (kg•℃); M is the mass of the heated medium, kg; ΔT is the difference between the set temperature and the initial temperature in ℃; t is the time required to heat the medium from the initial temperature to the set temperature, h; S is the safety factor.

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