Feeding device for improving titanium yield of titanium tetrachloride molten salt furnace and using method of feeding device

Abstract

The invention belongs to the technical field of titanium tetrachloride production, and relates to a feeding device for improving the titanium yield of a titanium tetrachloride molten salt furnace and a use method of the feeding device. According to the feeding device and the feeding mode, the loss of materials in the fused salt chlorination process can be remarkably reduced, the materials can be uniformly distributed in fused salt by directly adding the materials below the liquid level of the fused salt, the chlorination reaction is more sufficient, fine particles taken away by titanium tetrachloride gas are reduced by 80%, the loss of the materials is greatly reduced, and the service life of the materials is prolonged. Leakage of titanium tetrachloride caused by abrasion of a pump outlet pipeline in a subsequent process is avoided; according to the feeding device, gas conveying is adopted, the chlorination reaction is an exothermic reaction, and normal-temperature nitrogen is adopted for conveying materials, so that the temperature of titanium tetrachloride escaping outwards from the high-temperature molten salt tank can be reduced; by accurately controlling the pressure and flow of material conveying, the yield of titanium products is further improved, the production cost is reduced, and the economical efficiency and safety of titanium tetrachloride production are enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of titanium tetrachloride production, and particularly relates to a feeding device for improving titanium yield in a titanium tetrachloride molten salt furnace and a use method thereof. Background Art

[0002] At present, the main raw materials for producing titanium tetrachloride using the molten salt method in China include: titanium-rich materials, calcined coke, chlorine, and auxiliary materials are industrial salt. The temperature of the molten salt pool in the molten salt furnace is maintained at 750°C, and the molten salt is mainly composed of sodium chloride, potassium chloride and magnesium chloride in a molten state. Other solid materials are fed in through a feeding port on the top of the molten salt furnace, which is located about 600 to 1000 mm above the molten salt liquid level. During the feeding process, the solid particles will first float on the molten salt liquid surface, and then slowly sink into the high-temperature molten salt.

[0003] The titanium tetrachloride gas generated by the reaction escapes and rises from the inside of the molten salt, taking away some fine particles floating on the liquid surface. These fine particles will eventually settle in the storage tank in the condensation system, causing wear of the outlet pipe of the submersible pump in the condensation system, which in turn causes titanium tetrachloride gas leakage. It is worth noting that these fine particles that are taken away do not participate in the chlorination reaction, but directly enter the subsequent process. Depending on the particle size of the raw materials, the material loss rate added to the molten salt furnace is approximately between 5% and 10%. Therefore, it is urgent to propose a new type of submersible feeding method to reduce the material loss rate and prevent titanium tetrachloride leakage caused by wear of the outlet pipe of the submersible pump in the subsequent process.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The purpose of the present invention is to overcome the disadvantages of the prior art and provide a feeding device for improving the titanium yield of a titanium tetrachloride molten salt furnace and a method for using the same.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] On the one hand, the present invention provides a feeding device for improving the titanium yield of a titanium tetrachloride molten salt furnace, comprising an inner liner pipe for feeding materials into the molten salt furnace and tilted downward at a certain angle and arranged on the wall of the molten salt furnace, one end of the inner liner pipe passes through the molten salt furnace wall and is arranged below the molten salt liquid surface, and the other end is connected to a feeder in front of the furnace through an air lock valve, and a gas tank for feeding materials into the molten salt furnace through the inner liner pipe is also provided between the air lock valve and the inner liner pipe.

[0008] Specifically, the other end of the liner pipe is connected to the feeding connecting pipe through the molten salt furnace connecting port, the feeding connecting pipe is connected to the gas lock valve, and the gas tank is connected to the feeding connecting pipe.

[0009] Specifically, a gas pipeline is provided between the inner liner pipe and the gas tank, and a manual valve and a pneumatic regulating valve for adjusting the pressure inside the inner liner pipe are provided on the gas pipeline; nitrogen can be used as the gas used for material transportation; during the shutdown and maintenance period or the heating period of the furnace, the gas lock valve is kept in a closed state and the gas pipeline is always in a ventilated state.

[0010] Specifically, the pressure of the gas conveying material in the inner liner pipe is P, where P is 30-40Kpa.

[0011] Specifically, a gas flow meter is provided between the inner liner pipe and the gas tank; a pressure gauge is also provided on the gas tank.

[0012] Specifically, the material of the inner lining pipe includes but is not limited to one of silicon nitride and fluorphlogopite, and the material of the inner lining pipe needs to be temperature-resistant at 750-800 degrees, wear-resistant, and non-reactive with titanium tetrachloride and chlorine.

[0013] Specifically, the angle between the inner liner pipe and the horizontal line is A, wherein A is 40-45°.

[0014] Specifically, the distance between one end of the liner pipe located below the molten salt liquid surface and the molten salt liquid surface is H1, wherein 400≤H≤800mm.

[0015] Specifically, the furnace front feeder has remote communication, material weight accumulation and instantaneous flow display, and the amount of added material is remotely controlled by a controller.

[0016] Specifically, the same molten salt furnace can be fed with a single feeding port or with multiple feeding ports at the same time; multiple feeding ports can allow materials to be evenly added to the molten salt furnace.

[0017] In another aspect, the present invention provides a method for using the above-mentioned feeding device, and the specific method is as follows:

[0018] First, open the gas lock valve to allow the material to fall from the furnace front feeder onto the molten salt at the bottom of the liner pipe; then, the material is pressed into the molten salt through the gas in the gas tank.

[0019] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0020] The feeding device and feeding method adopted by the present invention can significantly reduce the loss of materials in the molten salt chlorination process. By directly adding the materials below the molten salt liquid surface, the materials can be evenly distributed in the molten salt, the chlorination reaction is more complete, and the fine particles (below 200 mesh) carried away by the titanium tetrachloride gas are reduced by 80%, thereby reducing the loss of materials and avoiding the leakage of titanium tetrachloride due to the wear of the pump outlet pipeline in the subsequent process.

[0021] Furthermore, the feeding device adopts gas transportation, and because the chlorination reaction is an exothermic reaction, the material is transported by nitrogen at room temperature, which can reduce the temperature of titanium tetrachloride escaping from the high-temperature molten salt pool.

[0022] Furthermore, by precisely controlling the pressure and flow rate of material delivery, the yield of titanium products is further improved, the production cost is reduced, and the economy and safety of titanium tetrachloride production are enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the present invention.

[0024] In order to more clearly illustrate the embodiments of the present invention 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Among them: 1 is the front-of-furnace feeder; 2 is the gas pipeline; 3 is the gas flow meter; 4 is the pneumatic regulating valve; 5 is the manual valve; 6 is the gas outlet pipe; 7 is the feeding connecting pipe; 8 is the molten salt furnace connection port; 9 is the lining pipe; 10 is the air lock valve; 11 is the gas tank. DETAILED DESCRIPTION

[0027] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the accompanying drawings. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are only examples consistent with some aspects of the present invention as detailed in the appended claims.

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] A feeding device for improving the titanium yield of a titanium tetrachloride molten salt furnace comprises an inner liner pipe 9 which is used to feed materials into the molten salt furnace and is arranged on the wall of the molten salt furnace at a certain downward angle. One end of the inner liner pipe 9 passes through the molten salt furnace wall and is arranged below the molten salt liquid surface, and the other end is connected to a feeder 1 in front of the furnace through an air lock valve 10. A gas tank 11 which is used to feed materials into the molten salt furnace through the inner liner pipe 9 is also arranged between the air lock valve 10 and the inner liner pipe 9.

[0030] Specifically, the other end of the liner pipe 9 is connected to the feeding connecting pipe 7 through the molten salt furnace connecting port 8, the feeding connecting pipe 7 is connected to the air lock valve 10, and the gas tank 11 is connected to the feeding connecting pipe 7.

[0031] Specifically, a gas pipeline 2 is provided between the inner liner pipe 9 and the gas tank 11 , and a manual valve 5 and a pneumatic regulating valve 4 for adjusting the pressure in the inner liner pipe 9 are provided on the gas pipeline 2 .

[0032] Specifically, the pressure of the gas conveying material in the inner liner pipe 9 is P, where P is 30-40Kpa.

[0033] Specifically, a gas flow meter 3 is provided between the inner liner pipe 9 and the gas tank 11 ; a pressure gauge is also provided on the gas tank 11 .

[0034] Specifically, the inner liner tube 9 is made of silicon nitride.

[0035] Specifically, the angle between the inner liner pipe 9 and the horizontal line is A, wherein A is 40-45°.

[0036] Specifically, the distance between one end of the liner tube 9 located below the molten salt liquid surface and the molten salt liquid surface is H1, wherein 400≤H1≤800mm.

[0037] Specifically, the furnace front feeder 1 has remote communication, material weight accumulation and instantaneous flow display, and the amount of added material is remotely controlled by a controller.

[0038] Example 1

[0039] The present embodiment provides a feeding device for improving the titanium yield of a titanium tetrachloride molten salt furnace, comprising an inner liner pipe 9 for feeding materials into the molten salt furnace and arranged on the wall of the molten salt furnace at a certain downward angle, one end of the inner liner pipe 9 passes through the molten salt furnace wall and is arranged below the molten salt liquid surface, and the other end is connected with the molten salt furnace connection port 8, the feeding connection pipe 7, and the air lock valve 10 in sequence, the air lock valve 10 is connected with the front feeder 1 of the furnace, the feeding connection pipe 7 is connected with the gas outlet pipe (6), and the gas outlet pipe (6) is connected with the gas tank 11 through the manual valve 5, the pneumatic regulating valve 4 for adjusting the pressure in the inner liner pipe 9, the gas flow meter 3, and the gas pipeline 2 in sequence.

[0040] Specifically, the pressure of the gas conveying material in the inner liner pipe 9 is P, where P is 40 kPa.

[0041] Specifically, the inner lining tube 9 is made of silicon nitride or fluorphlogopite.

[0042] Specifically, the angle between the inner liner pipe 9 and the horizontal line is A, where A is 45°.

[0043] Specifically, the distance between the end of the liner tube 9 located below the molten salt liquid surface and the molten salt liquid surface is H1, wherein H1 = 600 mm.

[0044] Specifically, the furnace front feeder 1 has remote communication, material weight accumulation and instantaneous flow display, and the amount of added material is remotely controlled by a controller.

[0045] This embodiment also provides a method for using a feeding device for improving titanium yield in a titanium tetrachloride molten salt furnace, which is specifically as follows:

[0046] Preparation for feeding: the air lock valve 10 is closed, the pressure in the gas tank 11 is 40 kPa, the manual valve 5 is fully open, and the flow rate of the nitrogen gas flow meter 3 is set to 50 Nm 3 / h, the pneumatic regulating valve 4 adjusts itself according to the set flow rate.

[0047] Feeding operation: Set the amount of nitrogen pneumatic flowmeter 3, set the pressure and flow according to the amount of nitrogen associated with the high titanium slag feeding amount; at the same time, set the feeding speed of the furnace feeder 1, start the furnace feeder 1 and the air lock valve 10 (the furnace feeder 1 and the air lock valve 10 are started interlocked at the same time).

[0048] Stop feeding: After the feeding is completed, close the furnace feeder 1 and the air lock valve 10, and set the flow rate of the gas flow meter 3 to 50Nm 3 / h (manual valve 5 is in fully open state).

[0049] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0050] It should be understood that the present invention is not limited to what has been described above and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A feeding device for improving titanium yield in a titanium tetrachloride molten salt furnace, characterized in that: The invention comprises an inner lining pipe (9) for feeding materials into a molten salt furnace and arranged on the wall of the molten salt furnace at a downward angle. One end of the inner lining pipe (9) passes through the wall of the molten salt furnace and is arranged below the liquid surface of the molten salt. The other end is connected to a feeder (1) in front of the furnace through an air lock valve (10). A gas tank (11) for feeding materials into the molten salt furnace through the inner lining pipe (9) is also arranged between the air lock valve (10) and the inner lining pipe (9).

2. The feeding device according to claim 1, characterized in that: The other end of the inner lining pipe (9) is connected to the feeding connecting pipe (7) through the molten salt furnace connecting port (8), the feeding connecting pipe (7) is connected to the air lock valve (10), and the gas tank (11) is connected to the feeding connecting pipe (7).

3. The feeding device according to claim 1, characterized in that: A gas pipeline (2) is provided between the inner liner pipe (9) and the gas tank (11), and a manual valve (5) and a pneumatic regulating valve (4) for regulating the pressure in the inner liner pipe (9) are provided on the gas pipeline (2).

4. The feeding device according to claim 3, characterized in that: The pressure of the gas conveying material in the inner liner pipe (9) is P, where P is 30-40Kpa.

5. The feeding device according to claim 1, characterized in that: A gas flow meter (3) is provided between the inner lining pipe (9) and the gas tank (11).

6. The feeding device according to claim 1, characterized in that: The material of the inner lining tube (9) includes, but is not limited to, one of silicon nitride and fluorphlogopite.

7. The feeding device according to claim 1, characterized in that: The angle between the inner liner pipe (9) and the horizontal line is A, wherein A is 40-45°.

8. The feeding device according to claim 1, characterized in that: The distance between one end of the inner lining tube (9) located below the molten salt liquid surface and the molten salt liquid surface is H1, wherein 400≤H1≤800mm.

9. The feeding device according to claim 1, characterized in that: The furnace front feeder (1) has remote communication, material weight accumulation and instantaneous flow display, and the amount of added material is remotely controlled by a controller.

10. The method for using the feeding device according to any one of claims 1 to 9, characterized in that: The specific method is as follows: First, the gas lock valve (10) is opened to allow the material to fall from the furnace front feeder (1) onto the molten salt at the bottom of the inner lining pipe (9); then, the material is pressed into the molten salt through the gas in the gas tank (11).

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