Powder spraying equipment of vacuum magnesium smelting furnace

Abstract

The utility model provides powder spraying equipment of a vacuum magnesium smelting furnace. The powder spraying equipment comprises an inert gas storage device, an inert gas conveying pipeline assembly, a stock bin assembly, a powder spraying pipeline assembly and a spray gun which are sequentially communicated, the spray gun is inserted into a molten pool of the vacuum magnesium smelting furnace, and the inert gas storage device is used for storing inert gas and taking the inert gas as a carrier for conveying powder; the inert gas conveying pipeline assembly is used for conveying the inert gas into the stock bin assembly; the stock bin assembly is used for storing silicon powder and calcined white powder; the powder spraying pipeline assembly is used for conveying the silicon powder and the calcined white powder to the spraying gun; and the spray gun is used for spraying the silicon powder and the calcined white powder into a molten pool of the vacuum magnesium smelting furnace. By utilizing the magnesium smelting device, the problems of low mechanization degree, low per unit yield, high energy consumption and serious pollution in the existing magnesium smelting scheme can be solved.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical technology, and more specifically, to a powder spraying device for a vacuum magnesium smelting furnace. Background Technology

[0002] Currently, magnesium smelting methods are mainly divided into two types: electrothermal method and thermal reduction method. The electrothermal method is not widely used due to its complex byproduct processing and high cost. The thermal reduction method, depending on the reducing agent, is mainly divided into silicothermic reduction, carbothermic reduction, aluminothermic reduction, and calcothermic reduction, among others. The silicothermic method includes the Pidgeon process and the Magnet process, among others.

[0003] The Pidgeon process is a major magnesium smelting method in my country. The process involves mixing calcined dolomite, ferrosilicon, and fluorite in a specific ratio, grinding them into a fine powder, pressing them into pellets, placing them in a reduction tank, and reducing them at 1100–1200℃ and 10–13 Pa for 9–12 hours to obtain crystalline magnesium. This method is simple, requires little infrastructure investment, allows for rapid plant construction, and produces relatively high purity magnesium, making it a primary magnesium smelting method in my country. However, it suffers from low mechanization, low output per unit area, high energy consumption, and significant pollution.

[0004] To address the aforementioned problems, this utility model provides a powder injection device for a vacuum magnesium smelting furnace. Utility Model Content

[0005] In view of the above problems, the purpose of this utility model is to provide a powder injection device for a vacuum magnesium smelting furnace to solve the problems of low mechanization, low output, high energy consumption and high pollution in the existing magnesium smelting scheme.

[0006] This utility model provides a powder spraying device for a vacuum magnesium smelting furnace, comprising, in sequence, an inert gas storage device, an inert gas conveying pipeline assembly, a silo assembly, a powder spraying pipeline assembly, and a spray gun; the spray gun is inserted into the molten pool of the vacuum magnesium smelting furnace, wherein...

[0007] The inert gas storage device is used to store inert gas and to use the inert gas as a carrier for conveying powder.

[0008] The inert gas conveying pipeline assembly is used to convey the inert gas to the silo assembly;

[0009] The silo assembly is used to store silicon powder and calcined white powder;

[0010] The powder spraying pipe assembly is used to transport the silicon powder and calcined white powder to the spray gun;

[0011] The spray gun is used to spray the silicon powder and calcined white powder into the molten pool of the vacuum magnesium smelting furnace.

[0012] Furthermore, a preferred configuration is that a gas delivery valve is provided on the inert gas storage device, and the flow rate of the inert gas is adjusted by the gas delivery valve.

[0013] Furthermore, in a preferred configuration, the inert gas conveying pipeline assembly includes a first gas conveying pipeline and a second gas conveying pipeline, and the silo assembly includes a silicon powder silo and a calcined white powder silo; wherein,

[0014] The first gas conveying pipeline is connected to the calcined white powder silo, and the first gas conveying pipeline is used to convey the inert gas to the calcined white powder silo;

[0015] The second gas delivery pipeline is connected to the silicon powder silo and is used to deliver the inert gas to the silicon powder silo.

[0016] In addition, a preferred structure is that a powder discharge valve is provided at the bottom of the silicon powder silo and the calcined white powder silo, respectively, and the connection between the silicon powder silo, the calcined white powder silo and the powder spraying pipeline assembly is controlled by the corresponding powder discharge valve.

[0017] Furthermore, in a preferred configuration, pressure gauges are respectively installed on the silicon powder silo and the calcined white powder silo to detect the pressure of the inert gas inside the silicon powder silo and the calcined white powder silo.

[0018] Furthermore, in a preferred configuration, the powder spraying pipeline assembly includes a silicon powder spraying pipeline, a calcined white powder spraying pipeline, and a main powder spraying pipeline.

[0019] The silicon powder spraying pipe is connected to the bottom of the silicon powder silo, the calcined white powder spraying pipe is connected to the bottom of the calcined white powder silo, and the main spraying pipe is connected to the silicon powder spraying pipe, the calcined white powder spraying pipe, and the spray gun; wherein,

[0020] Silicon powder in the silicon powder silo is transported to the spray gun through the silicon powder spraying pipe and the main spraying pipe, and calcined white powder in the silicon powder silo is transported to the spray gun through the calcined white powder spraying pipe and the main spraying pipe.

[0021] Furthermore, a preferred configuration is that a reaction crucible is provided inside the vacuum magnesium smelting furnace, the reaction crucible being used to carry out a reduction reaction on the furnace charge.

[0022] Furthermore, a preferred configuration is that an induction heating coil is provided on the outside of the reaction crucible, the induction heating coil being used to heat the reaction crucible, causing the blocky ferrosilicon inside the reaction crucible to melt and form ferrosilicon molten liquid.

[0023] Furthermore, a preferred configuration is that a vacuum furnace cover is provided on top of the vacuum magnesium smelting furnace, and a splash guard is provided on top of the reaction crucible, the splash guard being used to prevent molten ferrosilicon from splashing out of the reaction crucible.

[0024] Furthermore, a preferred configuration is that openings are provided on the vacuum furnace cover and the splash guard, and the spray gun extends into the reaction crucible through the openings.

[0025] As can be seen from the above technical solution, the powder spraying equipment of the vacuum magnesium smelting furnace provided by this utility model uses inert gas to carry calcined white powder and silicon powder out of the silo, and enter the molten pool of the magnesium smelting furnace through the powder spraying pipe and spray gun, continuously replenishing the reducing agent and the reduced product required for the magnesium smelting reaction, so as to realize the continuous progress of the magnesium smelting reaction.

[0026] To achieve the foregoing and related objectives, one or more aspects of the present invention include the features that will be described in detail below. The following description and accompanying drawings illustrate certain exemplary aspects of the present invention. However, these aspects indicate only a few of the various ways in which the principles of the present invention can be used. Furthermore, the present invention is intended to include all such aspects and their equivalents. Attached Figure Description

[0027] Other objects and results of this utility model will become more apparent and readily understood with reference to the following description taken in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention. In the drawings:

[0028] Figure 1 This is a schematic diagram of the powder spraying equipment for a vacuum magnesium smelting furnace according to an embodiment of the present invention.

[0029] The reference numerals in the figures include:

[0030] 1. Inert gas storage device; 2. First gas conveying pipeline; 3. Second gas conveying pipeline; 4. Calcined white powder silo; 5. Silicon powder silo; 6. Main powder spraying pipeline; 7. Spray gun; 8. Vacuum magnesium smelting furnace; 9. Splashproof cover; 10. Reaction crucible; 11. Induction heating coil; 12. Vacuum furnace cover; 13. Calcined white powder spraying pipeline; 14. Silicon powder spraying pipeline.

[0031] In all the accompanying drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed Implementation

[0032] In the following description, numerous specific details are set forth for illustrative purposes and to provide a thorough understanding of one or more embodiments. However, it will be apparent that these embodiments may also be implemented without these specific details. In other instances, well-known structures and devices are shown in block diagram form for ease of description of one or more embodiments.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0035] To illustrate the structure of the powder injection device for the vacuum magnesium smelting furnace provided by this utility model, Figure 1 The structure of the powder injection device for a vacuum magnesium smelting furnace according to an embodiment of the present invention is shown.

[0036] like Figure 1 As shown, the powder spraying device for a vacuum magnesium smelting furnace provided by this utility model includes: an inert gas storage device 1, an inert gas conveying pipeline assembly connected to the inert gas storage device 1, a hopper assembly connected to the inert gas conveying pipeline assembly, a powder spraying pipeline assembly connected to the hopper assembly, and a spray gun 7 connected to the powder spraying pipeline assembly; the spray gun 7 is inserted into the molten pool of the vacuum magnesium smelting furnace 8, wherein the inert gas storage device 1 is used to store inert gas and use the inert gas as a carrier for conveying powder spraying; the inert gas conveying pipeline assembly is used to convey the inert gas to the hopper assembly; the hopper assembly is used to store silicon powder and calcined white powder; the powder spraying pipeline assembly is used to convey the silicon powder and calcined white powder to the spray gun; and the spray gun 7 is used to spray the silicon powder and calcined white powder into the molten pool of the vacuum magnesium smelting furnace.

[0037] In an embodiment of this invention, a gas delivery valve is provided on the inert gas storage device 1 to regulate the flow rate of the inert gas. The inert gas storage device 1 is used to store and release argon gas, using argon gas as a carrier to inject silicon powder and calcined white powder into the molten pool of the vacuum magnesium smelting furnace 8. The calcined white powder and silicon powder are carried out from the silo (silo assembly) by argon gas, enter the molten pool of the vacuum magnesium smelting furnace through the powder injection pipeline assembly, continuously replenish the magnesium smelting raw materials, and allow the magnesium smelting reaction to proceed continuously.

[0038] The inert gas conveying pipeline assembly includes a first gas conveying pipeline 2 and a second gas conveying pipeline 2. The silo assembly includes a silicon powder silo 5 and a calcined white powder silo 4. The first gas conveying pipeline 2 is connected to the calcined white powder silo 4 and is used to convey the inert gas to the calcined white powder silo 4. The second gas conveying pipeline 3 is connected to the silicon powder silo 5 and is used to convey the inert gas to the silicon powder silo 5.

[0039] Among them, powder discharge valves are respectively provided at the bottom of the silicon powder silo 5 and the calcined white powder silo 4, and the connection between the silicon powder silo 5, the calcined white powder silo 4 and the powder spraying pipeline assembly is controlled by the corresponding powder discharge valves.

[0040] Pressure gauges are installed on the silicon powder silo 5 and the calcined white powder silo 4 respectively, and the pressure of the inert gas inside the silicon powder silo 5 and the calcined white powder silo 4 is detected by the corresponding pressure gauges.

[0041] In an embodiment of this utility model, the powder spraying pipeline assembly includes a silicon powder spraying pipeline 14, a calcined white powder spraying pipeline 13, and a main powder spraying pipeline 6. The silicon powder spraying pipeline 14 is connected to the bottom of the silicon powder silo 5, the calcined white powder spraying pipeline 13 is connected to the bottom of the calcined white powder silo 4, and the main powder spraying pipeline 6 is connected to the silicon powder spraying pipeline 14, the calcined white powder spraying pipeline 13, and the spray gun 7. Silicon powder in the silicon powder silo 5 is transported to the spray gun 7 via the silicon powder spraying pipeline 14 and the main powder spraying pipeline 13, and calcined white powder in the silicon powder silo 5 is transported to the spray gun 7 via the calcined white powder spraying pipeline 4 and the main powder spraying pipeline 6.

[0042] A reaction crucible 10 is installed inside the vacuum magnesium smelting furnace 8, and the reaction crucible 10 is used to carry out a reduction reaction on the furnace charge. An induction heating coil 11 is installed on the outside of the reaction crucible 10, and the induction heating coil 11 is used to heat the reaction crucible 10, so that the blocky ferrosilicon inside the reaction crucible 10 melts to form ferrosilicon molten liquid.

[0043] A vacuum furnace cover 12 is provided on the top of the vacuum magnesium smelting furnace 8, and a splash guard 9 is provided on the top of the reaction crucible 10. The splash guard 9 is used to prevent molten ferrosilicon from splashing out of the reaction crucible 10. Openings are provided on the vacuum furnace cover 12 and the splash guard 9, and the spray gun 7 extends into the reaction crucible 10 of the vacuum magnesium smelting furnace 8 through the openings.

[0044] In the embodiments of this utility model, the principle of powder injection using a vacuum magnesium smelting furnace is as follows:

[0045] The inert gas in the inert gas storage device is transported to the silicon powder silo and the calcined white powder silo respectively through the inert gas conveying pipeline assembly;

[0046] When the air pressure in the silicon powder silo and the calcined white powder silo reaches the preset air pressure, the silicon powder in the silicon powder silo and the calcined white powder in the calcined white powder silo are transported to the spray gun through the powder spraying pipeline assembly;

[0047] Using the inert gas as a carrier, the silicon powder and the calcined white powder are sprayed into the molten pool inside the vacuum magnesium smelting furnace through the spray gun.

[0048] In embodiments of this utility model, the powder spraying via the powder spraying device of the vacuum magnesium smelting furnace includes two methods: the first method is to sequentially spray the calcined white powder and the silicon powder into the molten pool; the second method is to simultaneously spray the calcined white powder and the silicon powder into the molten pool.

[0049] Specifically, in the first method: during the process of sequentially injecting the calcined white powder and the silicon powder into the molten pool, the inert gas is transported to the calcined white powder silo through the first gas transport pipe in the inert gas transport pipe assembly;

[0050] When the air pressure in the calcined white powder silo reaches the preset air pressure, the powder outlet valve at the bottom of the calcined white powder silo is opened, and the calcined white powder is sprayed into the molten pool in the vacuum magnesium smelting furnace under the action of the inert gas. The ferrosilicon in the molten pool reacts with the calcined white powder to generate magnesium vapor.

[0051] When the reaction in the vacuum magnesium furnace is finished, the powder outlet valve of the calcined white powder silo is closed, the gas inlet valve of the silicon powder silo is opened, and the inert gas is transported to the silicon powder silo through the second gas conveying pipe in the inert gas conveying pipe assembly.

[0052] When the air pressure in the silicon powder silo reaches the preset air pressure, the powder outlet valve at the bottom of the silicon powder silo is opened, and the silicon powder silo is sprayed into the molten pool in the vacuum magnesium smelting furnace under the action of the inert gas, so that the silicon element in the molten pool is replenished.

[0053] Once the silicon powder is replenished, the powder outlet valve of the silicon powder silo is closed, and the powder outlet valve at the bottom of the calcined white powder silo is opened to spray the calcined white powder into the molten pool inside the vacuum magnesium smelting furnace to continue generating magnesium vapor, thereby achieving continuous production of metallic magnesium.

[0054] In a specific embodiment of this invention, 75% ferrosilicon (reducing agent) in blocks is placed in a vacuum magnesium smelting furnace, and heating is initiated. When the temperature reaches 1400-1450 degrees Celsius, the ferrosilicon melts completely, forming a ferrosilicon molten pool. At this point, the gas delivery valve is opened, the flow rate of argon (inert gas) is adjusted, and the pressure gauge outside the calcined white powder silo is observed. When the pressure exceeds the preset pressure, it indicates that the argon gas has filled the calcined white powder silo. At this time, the powder outlet valve at the bottom of the calcined white powder silo is opened, and the argon gas rapidly carries the calcined white powder into the ferrosilicon molten pool, thus initiating the ferrosilicon reduction process to obtain calcined white powder. The reaction of magnesium vapor; when the reaction in the furnace is observed to be over, close the calcined white powder discharge valve, open the silicon powder silo inlet valve, observe the external pressure gauge, and when the pressure exceeds the preset pressure, open the powder discharge valve at the bottom of the silicon powder silo to spray silicon powder into the ferrosilicon molten pool to quickly replenish the silicon content, so that the reducing agent in the furnace is replenished. Add silicon powder according to the amount of ferrosilicon in the molten pool. After replenishment is completed, close the silicon powder discharge valve, open the calcined white powder discharge valve, and continue the magnesium smelting reaction. Continuously replenish the reducing agent and reduced material required for the magnesium smelting reaction to achieve continuous magnesium smelting reaction.

[0055] In an embodiment of this utility model, the second method is as follows: during the process of simultaneously injecting the calcined white powder and the silicon powder into the molten pool, the inert gas is simultaneously transported to the calcined white powder silo and the silicon powder silo through the first gas transport pipe and the second gas transport pipe in the inert gas transport pipe assembly, respectively.

[0056] When the gas pressure in the silicon powder silo and the calcined white powder silo reaches the preset gas pressure, the powder outlet valves of the calcined white powder silo and the silicon powder silo are opened. Under the action of the inert gas, the calcined white powder and the silicon powder are simultaneously sprayed into the molten pool inside the vacuum magnesium smelting furnace by a spray gun. The ferrosilicon in the molten pool reacts with the calcined white powder to generate magnesium vapor.

[0057] During the reaction between ferrosilicon and calcined white powder in the molten pool, silicon powder is continuously added to the molten pool to achieve continuous production of magnesium vapor.

[0058] It should be noted that the inert gas can be argon, and in specific applications, a suitable inert gas is selected based on the actual situation, and it is not limited to argon. The preset gas pressure is usually greater than or equal to one atmosphere and can be adjusted according to specific circumstances, but it must be sufficient to completely replace the air in the hopper.

[0059] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A powder injection device for a vacuum magnesium smelting furnace, characterized in that, include: The inert gas storage device, inert gas conveying pipeline assembly, silo assembly, powder injection pipeline assembly, and spray gun are connected in sequence; the spray gun is inserted into the molten pool of the vacuum magnesium smelting furnace, wherein... The inert gas storage device is used to store inert gas and to use the inert gas as a carrier for conveying powder. The inert gas conveying pipeline assembly is used to convey the inert gas to the silo assembly; The silo assembly is used to store silicon powder and calcined white powder; The powder spraying pipe assembly is used to transport the silicon powder and calcined white powder to the spray gun; The spray gun is used to spray the silicon powder and calcined white powder into the molten pool of the vacuum magnesium smelting furnace.

2. The powder injection equipment for the vacuum magnesium smelting furnace according to claim 1, characterized in that, A gas delivery valve is provided on the inert gas storage device, and the flow rate of the inert gas is adjusted by the gas delivery valve.

3. The powder injection equipment for the vacuum magnesium smelting furnace according to claim 1, characterized in that, The inert gas conveying pipeline assembly includes a first gas conveying pipeline and a second gas conveying pipeline; the silo assembly includes a silicon powder silo and a calcined white powder silo; wherein... The first gas conveying pipeline is connected to the calcined white powder silo, and the first gas conveying pipeline is used to convey the inert gas to the calcined white powder silo; The second gas delivery pipeline is connected to the silicon powder silo and is used to deliver the inert gas to the silicon powder silo.

4. The powder injection equipment for the vacuum magnesium smelting furnace according to claim 3, characterized in that, A powder discharge valve is provided at the bottom of the silicon powder silo and the calcined white powder silo, respectively, and the connection between the silicon powder silo, the calcined white powder silo and the powder spraying pipeline assembly is controlled by the corresponding powder discharge valve.

5. The powder injection equipment for the vacuum magnesium smelting furnace according to claim 3, characterized in that, Pressure gauges are installed on the silicon powder silo and the calcined white powder silo respectively, and the pressure of the inert gas inside the silicon powder silo and the calcined white powder silo is detected by the corresponding pressure gauges.

6. The powder injection equipment for the vacuum magnesium smelting furnace according to claim 3, characterized in that, The powder spraying pipeline assembly includes a silicon powder spraying pipeline, a calcined white powder spraying pipeline, and a main powder spraying pipeline. The silicon powder spraying pipe is connected to the bottom of the silicon powder silo, the calcined white powder spraying pipe is connected to the bottom of the calcined white powder silo, and the main spraying pipe is connected to the silicon powder spraying pipe, the calcined white powder spraying pipe, and the spray gun; wherein, Silicon powder in the silicon powder silo is transported to the spray gun through the silicon powder spraying pipe and the main spraying pipe, and calcined white powder in the silicon powder silo is transported to the spray gun through the calcined white powder spraying pipe and the main spraying pipe.

7. The powder injection equipment for the vacuum magnesium smelting furnace according to claim 6, characterized in that, A reaction crucible is installed inside the vacuum magnesium smelting furnace, which is used to carry out a reduction reaction on the furnace charge.

8. The powder injection equipment for the vacuum magnesium smelting furnace according to claim 7, characterized in that, An induction heating coil is provided on the outside of the reaction crucible. The induction heating coil is used to heat the reaction crucible, so that the blocky ferrosilicon inside the reaction crucible melts to form ferrosilicon molten liquid.

9. The powder injection equipment for the vacuum magnesium smelting furnace according to claim 7, characterized in that, A vacuum furnace cover is provided on the top of the vacuum magnesium smelting furnace, and a splash guard is provided on the top of the reaction crucible. The splash guard is used to prevent molten ferrosilicon from splashing out of the reaction crucible.

10. The powder injection equipment for the vacuum magnesium smelting furnace according to claim 9, characterized in that, Openings are provided on the vacuum furnace cover and the splash guard, and the spray gun extends into the reaction crucible through the openings.

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