Preheating type silicothermic magnesium smelting reduction device
By introducing a transmission mesh belt preheating furnace and insulation silo to the silicon thermal magnesium refining reduction device, preheating and insulation of the material ball, then performing a reduction reaction, the problem of uneven heat transfer of the material ball is solved, and the efficiency and production efficiency of the magnesium reduction reaction are improved.
Patent Information
- Application Number
- CN202421593827.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-05
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-05
AI Technical Summary
In the existing silicon thermal magnesium reduction process, the heat transfer of the material balls is uneven, resulting in long magnesium reduction reaction cycle, low production efficiency, and high energy consumption.
A preheated silicon thermal magnesium refining reduction device is designed, including a transmission mesh belt preheating furnace, an insulation silo and a vertical tank reduction furnace. After the material ball is preheated in the transmission mesh belt preheating furnace, it enters the insulation silo for insulation, and finally enters the vertical tank reduction furnace for reduction reaction.
The preheating device preheats the material ball, which shortens the heat conduction time of the material ball in the reduction furnace, improves the reduction efficiency, and shortens the magnesium reduction reaction time, thereby improving production efficiency and saving energy consumption.
Smart Images
Figure CN222861577U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of magnesium production devices, in particular to a preheating type silicon thermal method magnesium smelting reduction device. Background Art
[0002] my country is the world's largest magnesium producer, accounting for about 85% of the world's total magnesium production. Most of my country's magnesium plants use the silicothermic method to produce metallic magnesium. The reduction process is the core process of silicothermic magnesium smelting and needs to be completed in a vacuum thermal reduction tank.
[0003] In the existing reduction process, firstly, the material balls at room temperature are loaded into the reduction tank of the reduction furnace, and then the fire baffle and the crystallizer are loaded in sequence, and the tank body is sealed. After that, the reduction furnace heats the reduction tank to complete the reduction of magnesium. However, the heat of the material balls inside the existing reduction furnace is transferred layer by layer, and the heat transfer thickness of the material layer is about 145-170 mm. At the same time, during the heating process, the material balls in the outer layer are heated first, and magnesium vapor is precipitated after reaching the reaction temperature. The remaining reduction slag (mainly composed of calcium silicate or dicalcium silicate and magnesium oxide) has a low heat transfer rate, which affects the heat transfer effect, thereby leading to problems such as a long magnesium reduction reaction cycle, low production efficiency, and high energy consumption. Utility Model Content
[0004] The purpose of the utility model is to provide a preheating silicon thermal method magnesium smelting reduction device to solve the above-mentioned technical problems existing in the prior art; the preferred technical scheme among the many technical schemes provided by the utility model can produce many technical effects; see the following description for details.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] The utility model provides a preheating type silicon thermal method magnesium smelting reduction device, comprising a preheating device, an insulation silo and a reduction furnace, wherein: the preheating device, the insulation silo and the reduction furnace are arranged in sequence along the ball conveying direction, and the balls preheated by the preheating device can enter the reduction furnace through the insulation silo; the preheating device is arranged as a transmission-type mesh belt preheating furnace.
[0007] Preferably, the discharge end of the transmission-type mesh belt preheating furnace is arranged on the upper side of the feed port of the insulation silo.
[0008] Preferably, the transmission-type mesh belt preheating furnace comprises a conveyor belt mechanism and a heating furnace, wherein: the heating furnace is arranged on the upper side of the conveyor belt mechanism; the heating furnace is sequentially provided with a preheating zone and a heating zone along the conveying direction of the conveyor belt mechanism.
[0009] Preferably, the heating furnace is configured as a continuous operation type resistance furnace; the furnace lining of the continuous operation type resistance furnace adopts a composite structure composed of mullite and aluminum silicate refractory fibers.
[0010] Preferably, the reduction furnace is configured as a vertical tank reduction furnace, and the feed inlet of the vertical tank reduction furnace is configured below the discharge outlet of the insulation silo.
[0011] Preferably, the vertical tank reduction furnace comprises a furnace body, wherein: the furnace body is connected to a premixed heat storage burner; a reduction tank is arranged in the furnace body, a central tube is arranged in the reduction tank, an annular material cavity is formed between the outer wall of the central tube and the inner wall of the reduction tank, and a discharge port is arranged at the bottom of the reduction tank; a crystallization device is arranged on the upper side of the annular material cavity on the furnace body.
[0012] Preferably, the number of the premixed regenerative burners is set to be multiple, and all of the premixed regenerative burners are arranged on both sides of the furnace body.
[0013] Preferably, the crystallization device comprises a crystallizer and a cooling jacket, wherein: the crystallizer is arranged on the upper side of the annular material chamber; and the cooling jacket is sleeved on the crystallizer.
[0014] Preferably, the cooling jacket is configured as a water cooling jacket.
[0015] Preferably, the number of the reduction tanks is set to be multiple, and all the reduction tanks are arranged in the furnace body in sequence.
[0016] The preheating silicon thermal method magnesium reduction device provided by the utility model has at least the following beneficial effects:
[0017] The preheating silicon thermal method magnesium reduction device comprises a preheating device, a heat preservation silo and a reduction furnace, wherein the preheating device, the heat preservation silo and the reduction furnace are arranged in sequence. When producing metal magnesium, the material balls are preheated by the preheating device and then enter the heat preservation silo. The heat preservation silo has a good heat preservation effect to ensure the preheating temperature of the material balls. Then, the preheated material balls in the heat preservation silo enter the reduction furnace. Thus, the material balls are preheated before entering the reduction furnace.
[0018] The preheating device is configured as a transmission-type mesh belt preheating furnace. The transmission-type mesh belt preheating furnace has a significant preheating effect while conveying the material balls, can effectively preheat the material balls to a suitable furnace entry temperature, reduce the heat conduction time in the reduction furnace, and improve the reduction efficiency of the reduction furnace.
[0019] The preheating device, the heat-insulating silo and the reduction furnace of the utility model cooperate with each other. Before the material balls enter the reduction furnace, they are preheated first. The preheating device adopts a transmission-type mesh belt preheating furnace. On the one hand, it has a significant preheating effect, so that the material balls can be preheated to a suitable furnace entry temperature, reducing the heat conduction time in the reduction furnace and improving the reduction efficiency of the reduction furnace. On the other hand, it has a superior conveying effect. While preheating, the material balls are conveyed. At the same time, it is a continuous operation and can supply materials to multiple reduction tanks, further improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0021] Figure 1 It is a structural schematic diagram of the utility model;
[0022] Figure 2 It is a structural schematic diagram of the transmission-type belt heating furnace of the utility model;
[0023] Figure 3 It is a schematic diagram of the internal structure of the vertical reduction furnace of the utility model.
[0024] Reference numerals
[0025] 1. Preheating device; 11. Heating furnace; 111. Preheating zone; 112. Heating zone; 12. Conveyor belt mechanism; 2. Insulated silo; 3. Reduction furnace; 31. Furnace bottom; 32. Furnace wall; 33. Furnace cover; 34. Premixed heat storage burner; 35. Reduction tank; 36. Center tube; 37. Annular material cavity; 38. Crystallizer; 39. Water cooling jacket; 4. Material ball. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.
[0027] Embodiment 1:
[0028] The utility model provides a preheating silicon thermal method magnesium reduction device, referring to Figure 1As shown, the preheating silicon thermal method magnesium smelting reduction device includes a preheating device 1, a heat-insulating silo 2 and a reduction furnace 3.
[0029] The preheating device 1 , the heat-insulating silo 2 and the reduction furnace 3 are arranged in sequence along the conveying direction of the material balls 4 .
[0030] The preheating device 1 is configured as a transmission-type mesh belt preheating furnace.
[0031] When producing magnesium, the material balls 4 are placed on the transmission mesh belt preheating furnace, and the transmission mesh belt preheating furnace preheats the material balls. When the material balls are heated to 900°C, they are transported to the insulation silo 2 and then enter the reduction furnace 3. After the reduction furnace 3 is sealed and evacuated, the material balls 4 begin the reduction reaction.
[0032] In the above process, the heat of the reduction reaction of the ball 4 is conducted layer by layer from the outside to the inside, and the reaction begins when the temperature is reached. The preheating silicon thermal method magnesium reduction device adds a preheating process before the reduction reaction of the ball. Therefore, it can greatly shorten the reduction reaction time of the ball in the reduction furnace 3. Compared with the existing 10 to 12 hours, it can be shortened to 4 to 6 hours, which not only improves the production efficiency, but also has the effect of saving energy and increasing production.
[0033] At the same time, the preheating device 1 adopts a transmission-type mesh belt preheating furnace. On the one hand, its material layer is relatively thin and has a significant preheating effect. It can quickly heat the material balls to the furnace entry temperature, thereby reducing the heat conduction time in the reduction furnace and improving the reduction efficiency of the reduction furnace. On the other hand, it has an excellent conveying effect. While completing the preheating, it can effectively convey the material balls. At the same time, it is a continuous operation and can supply multiple reduction tanks at the same time, further improving production efficiency.
[0034] Embodiment 2:
[0035] Example 2 is based on Example 1:
[0036] like Figures 1 to 3 As shown, the discharge end of the transmission-type mesh belt preheating furnace is arranged on the upper side of the feed port of the insulation silo 2.
[0037] The transmission type mesh belt preheating furnace includes a conveyor belt mechanism 12 and a heating furnace 11 .
[0038] The conveyor belt mechanism 12 adopts a variable frequency conveyor belt with adjustable speed; the conveyor belt of the conveyor belt mechanism 12 is a high temperature resistant metal mesh belt made of 314 stainless steel wire, the metal mesh belt is tightly woven in a herringbone shape, and has folded edges on both sides with a folded edge height of about 30 mm. The width of the metal mesh belt is 600 mm, which can ensure that the ball will not get stuck or fall during the conveying process; the conveyor belt of the conveyor belt mechanism 12 is driven by a drive motor and a rubber roller, and the drive motor adopts a 2.2 kW power.
[0039] The heating furnace 11 is arranged on the upper side of the conveyor belt mechanism 12, and the conveyor belt mechanism 12 runs through the heating furnace 11. The heating furnace 11 is sequentially provided with a preheating zone 111 and a heating zone 112 along the conveying direction of the conveyor belt mechanism 12, wherein the number of the heating zones 112 is set to be multiple, and each temperature zone is independently temperature-controlled and temperature-adjustable.
[0040] As an optional embodiment, the heating furnace 11 is configured as a continuous operation resistance furnace, the continuous operation resistance furnace selects a power of 200kw, its output power can be set from 0 to 100%, the temperature control range is room temperature to 950°C, and multiple ceramic thermocouples are used to perform real-time detection of the temperature of each temperature zone.
[0041] The furnace lining of the continuous operation type resistance furnace adopts a composite structure composed of mullite and aluminum silicate refractory fibers.
[0042] Specifically, the furnace lining includes a refractory layer and a thermal insulation layer. The refractory layer is built with mullite bricks, and the thermal insulation layer is filled with pre-pressed aluminum silicate refractory fiber modules.
[0043] The balls are preheated by the continuous operation resistance furnace. When discharging the balls, the balls are spread flat on the conveyor belt, such as two layers with a total thickness of 60 to 80 mm, which helps to accelerate preheating.
[0044] As an optional embodiment, the reduction furnace 3 is configured as a vertical tank reduction furnace, and the feed inlet of the vertical tank reduction furnace is arranged below the discharge outlet of the insulation silo 2 .
[0045] In the process of producing magnesium, the preheated balls in the heat-insulating silo 2 can directly enter the vertical tank reduction furnace through the feed inlet for reduction reaction.
[0046] Compared with the existing horizontal reduction furnace, the vertical tank reduction furnace can not only realize upper loading and lower discharging through overhead cranes, hoists, etc., but also is easy to operate, has low labor intensity, is easy to realize automated and continuous operation, occupies a small area, can save space, and has a higher output.
[0047] As an optional embodiment, the vertical pot reduction furnace 3 includes a furnace body, and the furnace body includes a furnace bottom 31 , a furnace wall 32 and a furnace cover 33 .
[0048] The furnace body is connected to a premixed regenerative burner 34, a reduction tank 35 is provided in the furnace body, a central tube 36 is arranged in the reduction tank 35, a connecting hole is provided on the tube wall of the central tube 36, an annular material cavity 37 is formed between the outer wall of the central tube 36 and the inner wall of the reduction tank 35, and a discharge port is provided at the bottom of the reduction tank 35; a crystallization device is provided on the upper side of the annular material cavity 37 on the furnace body.
[0049] When producing magnesium, the preheated material balls in the annular material chamber 37 quickly reach the critical reaction temperature under the heating action of the premixed regenerative burner 34, undergo a reduction reaction, and generate magnesium vapor. The magnesium vapor enters the central tube 36 through the connecting hole, rises, and enters the crystallization device to condense and crystallize.
[0050] As an optional implementation, the number of the premixing regenerative burners 34 is set to be multiple, and all the premixing regenerative burners 34 are arranged on both sides of the furnace body.
[0051] The multiple premixed regenerative burners 34 cooperate with each other to ensure the heating effect and improve the heating efficiency.
[0052] As an optional embodiment, the crystallization device includes a crystallizer 38 and a cooling jacket.
[0053] The crystallizer 38 is arranged on the upper side of the annular material chamber 37 ; the cooling jacket is sleeved on the crystallizer 38 .
[0054] In the process of producing magnesium, when water vapor enters the crystallizer 38, it condenses and adheres to the crystallizer 38 under the cooling effect of the cooling jacket.
[0055] As an optional implementation, the cooling jacket is configured as a water cooling jacket 39 .
[0056] It adopts water cooling, which is efficient, stable and has significant cooling effect.
[0057] As an optional implementation, the number of reduction tanks 35 is set to be multiple, and all reduction tanks 35 are arranged in the furnace body in sequence.
[0058] Optionally, the insulation silo 2 may be provided with one or more discharge ports. Furthermore, a movable trolley may be provided to form a movable silo, which can be connected with the corresponding feed port by movement, and can also be moved by hoisting.
[0059] In the description of the present application, it should be understood that the terms "upper", "lower", "inside", "outside", "top", "bottom", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "multiple" or "several" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0061] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0062] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. A preheating silicon thermal process magnesium reduction device, characterized in that: It includes a preheating device, a heat preservation silo and a reduction furnace, wherein: The preheating device, the heat-insulating silo and the reduction furnace are arranged in sequence along the conveying direction of the material balls, and the material balls preheated by the preheating device can enter the reduction furnace through the heat-insulating silo; The preheating device is configured as a transmission-type mesh belt preheating furnace.
2. The preheating silicon thermal process magnesium reduction device according to claim 1 is characterized in that: The discharging end of the transmission-type mesh belt preheating furnace is arranged on the upper side of the feeding port of the insulation silo.
3. The preheating silicon thermal process magnesium reduction device according to claim 2 is characterized in that: The transmission type mesh belt preheating furnace comprises a conveyor belt mechanism and a heating furnace, wherein: The heating furnace is arranged on the upper side of the conveyor belt mechanism; The heating furnace is sequentially provided with a preheating zone and a heating zone along the conveying direction of the conveyor belt mechanism.
4. The preheating silicon thermal process magnesium reduction device according to claim 3 is characterized in that: The heating furnace is configured as a continuous operation type resistance furnace; The furnace lining of the continuous operation type resistance furnace adopts a composite structure composed of mullite and aluminum silicate refractory fibers.
5. The preheating silicon thermal process magnesium reduction device according to claim 1 is characterized in that: The reduction furnace is configured as a vertical tank reduction furnace, and the feed inlet of the vertical tank reduction furnace is configured below the discharge outlet of the insulation silo.
6. The preheating silicon thermal process magnesium reduction device according to claim 5 is characterized in that: The vertical pot reduction furnace comprises a furnace body, wherein: The furnace body is connected with a premixed heat storage burner; A reduction tank is arranged in the furnace body, a central tube is arranged in the reduction tank, an annular material cavity is formed between the outer wall of the central tube and the inner wall of the reduction tank, and a discharge port is arranged at the bottom of the reduction tank; A crystallization device is arranged on the furnace body at the upper side of the annular material chamber.
7. The preheating silicon thermal process magnesium reduction device according to claim 6 is characterized in that: The number of the premixed regenerative burners is set to be multiple, and all the premixed regenerative burners are arranged on both sides of the furnace body.
8. The preheating silicon thermal process magnesium reduction device according to claim 6 is characterized in that: The crystallization device comprises a crystallizer and a cooling jacket, wherein: The crystallizer is arranged on the upper side of the annular material chamber; The cooling jacket is sleeved on the crystallizer.
9. The preheating silicon thermal process magnesium reduction device according to claim 8, characterized in that: The cooling jacket is configured as a water cooling jacket.
10. The preheating silicon thermal process magnesium reduction device according to claim 6, characterized in that: The number of the reduction tanks is set to be multiple, and all the reduction tanks are arranged in the furnace body in sequence.