Efficient environment-friendly fluidizing chlorination device for producing high-quality titanium tetrachloride for titanium sponge from domestic titanium slag raw material

Abstract

The utility model relates to a high-efficiency environment-friendly boiling chlorination device for producing high-quality titanium tetrachloride for sponge titanium from domestic titanium slag raw materials. And the yield cannot be improved. The top of a vertical boiling chlorination furnace is sequentially communicated in series through a gas phase flow pipeline, and is respectively communicated with the upper part of a front-section quenching slag catching bin and the upper part of a middle-section quenching slag removal bin of a sealed slag discharge tank through a bottom communication pipeline, and communicated with the middle part of a rear-section quenching cyclone separator through a bottom communication pipeline; a chlorine distribution disc communicated with a chlorine pipe is arranged at the bottom in the boiling chlorination furnace, and a slag discharge port in the middle of the bottom of the boiling chlorination furnace is downwards communicated with a heating slag discharge bin which is internally provided with an electric heater and is downwards communicated with a slag discharge pipe valve. The device has the advantages of preventing the slag discharge port from being blocked, ensuring smooth downward slag discharge, prolonging the continuous running time of boiling chlorination, reducing the blowing-out frequency and ensuring that a high-quality titanium tetrachloride raw material is provided for producing titanium sponge by utilizing a domestic titanium slag raw material.

Description

Technical Field

[0001] The utility model relates to a device for producing titanium tetrachloride from titanium slag, in particular to an efficient and environmentally friendly fluidized chlorination device for producing high-quality titanium tetrachloride for sponge titanium from domestic titanium slag raw materials. Background Art

[0002] At present, when using the fluidized chlorination method to produce titanium tetrachloride, titanium raw materials with rutile rich in titanium such as TiO2 > 90% and ∑MgO + CaO < 1.5% are required as raw materials, mainly relying on imports and being restricted by others. When using the molten salt chlorination method to produce titanium tetrachloride, there are many molten salt solid wastes, the production wastewater treatment cost is high, and the environmental protection pressure is extremely high. In particular, as the chlorination reaction of the titanium-rich material proceeds, titanium tetrachloride gas and impurities with different melting and boiling points in the fluidized chlorination furnace gas are distributed on the bed layer, enter the furnace gas outlet pipeline from the fluidized chlorination furnace, and various chlorides and dust generated during operation are easily condensed and caked in the quench pipe, blocking the furnace gas system pipeline. In addition, the generated viscous chlorides such as MgCl2 and CaCl2 adhere to the materials at the bottom of the chlorination furnace to form lumps, blocking the sieve plate holes, destroying the fluidization, and affecting the stable production of fluidized chlorination. In short, it is very urgent to use domestic titanium raw materials to produce high-quality titanium tetrachloride by the fluidized chlorination method. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the above defects of the prior art and provide an efficient and environmentally friendly fluidized chlorination device for producing high-quality titanium tetrachloride for sponge titanium from domestic titanium slag raw materials.

[0004] To achieve the above-mentioned purpose, the utility model is a highly efficient and environmentally friendly boiling chlorination device for producing high-quality titanium tetrachloride for sponge titanium from domestic titanium slag raw materials. The special feature of the utility model is that the top of the vertical boiling chlorination furnace is connected in series through gas phase process pipelines: the upper part of the front section quenching slag catching bin and the upper part of the middle section quenching slag removal bin of the sealed slag removal tank are connected through the bottom valve pipeline respectively, and the middle part of the rear section quenching cyclone separator is connected; a chlorine gas distribution plate connected to the chlorine pipe is arranged at the bottom of the boiling chlorination furnace, and the slag discharge port in the middle of the bottom of the boiling chlorination furnace is connected downwardly to the heating slag discharge bin with an electric heater inside and a slag discharge pipe valve connected downwardly. Among them, a shell and tube heat exchanger is arranged inside the front section slag catching bin and the middle section slag removal bin to condense the high boiling point impurities in the crude titanium tetrachloride system. At the bottom of the front section quenching slag catching bin and the middle section quenching slag removal bin, a sealed slag discharge tank is set, and a connecting pipeline is set between the front section quenching slag catching bin, the middle section quenching slag removal and the sealed slag discharge tank, which is controlled by an automatic switch valve to discharge slag regularly. Finally, the sealed slag tank with solid impurities collected is unloaded for impurity treatment. The bottom of the chlorination furnace is designed to be a funnel-shaped distribution heating for continuous slag discharge. A two-stage valve is set at the bottom of the chlorination furnace to control the seal. The top of the vertical boiling chlorination furnace is connected to the gas phase process pipeline, which is conducive to impurity discharge when the airflow rises. The large downward heat exchange space when the gas phase process pipeline is connected in series with the upper part of the front-stage rapid cooling slag catching bin and the upper part of the middle-stage rapid cooling slag removal bin is conducive to ensuring sufficient downward heat exchange slag catching and slag removal stroke, ensuring that the temperature of the slag settled after slag catching and slag removal can drop to the required temperature, avoiding high temperature rise and affecting the subsequent purification process; the small upward heat exchange space can make the introduced airflow obtain sufficient downward power as much as possible while meeting the necessary introduction of airflow buffer needs, which is conducive to throwing the slag entrained by the airflow downward, thereby improving the slag discharge and slag catching efficiency. The gas phase process pipeline is connected to the middle part of the rear-stage rapid cooling cyclone separator, which is conducive to both the upward movement of the purified airflow and the downward movement of the slag, and plays a better role in rapid cooling cyclone separation and purification. A chlorine gas distribution plate connected to the chlorine pipe is arranged at the bottom of the boiling chlorination furnace, and a slag discharge port in the middle of the bottom of the boiling chlorination furnace is downwardly connected to a heating slag discharge bin with an electric heater and a slag discharge pipe valve downwardly connected, so that the electric heater can heat the sticky material falling into the heating slag discharge bin, and then heat the slag discharge port and the chlorine gas distribution plate above, to avoid blocking the slag discharge port and the chlorine gas distribution plate, thereby playing a role in preventing blockage and ensuring smooth downward slag discharge. Compared with the prior art, the main advantages and effects of this novel invention are as follows: 1. It can be produced using domestic high-calcium-magnesium-rich titanium materials, and the impurity condensate can be collected and processed in sections according to the physical properties of the impurity condensate, so as to avoid the condensate of calcium chloride and magnesium chloride from clogging the system pipeline, better alleviate the problem of furnace gas pipeline clogging, extend the continuous operation time of boiling chlorination, and reduce the number of shutdowns; 2. The heated adhesive can be discharged in a liquid state along with the slag discharge pipe at the bottom of the chlorination furnace, so as to avoid the adhesive from clogging the sieve plate holes, extend the continuous operation time of boiling chlorination, and reduce the number of shutdowns.Therefore, it has the advantages of an anti-blocking slag discharge port, ensuring smooth downward slag discharge, significantly improving the slag discharge efficiency, significantly enhancing the purification efficiency of the gas-phase purification process pipeline, avoiding blockage by adhesives, prolonging the continuous operation time of fluidized bed chlorination, reducing the number of furnace shutdowns, and ensuring the provision of high-quality titanium tetrachloride raw materials for the production of titanium sponge using domestic titanium slag raw materials.

[0005] As an optimization, the bottom of the fluidized bed chlorination furnace is a frustum of a cone with a wider top and a narrower bottom, which can moderately disperse the upwardly rising chlorine gas and is beneficial to improving the fluidized bed chlorination efficiency; a chlorine gas distribution plate is arranged at the lower inner part of the bottom of the frustum-shaped fluidized bed chlorination furnace, and the chlorine gas distribution plate is horizontally connected and sealed through a chlorine gas pipe passing through the side wall of the bottom of the frustum-shaped fluidized bed chlorination furnace. In this way, it is beneficial to form a chlorine gas cushion at the bottom of the frustum-shaped fluidized bed chlorination furnace during production, avoiding the deposition and blockage of viscous substances in the chlorine gas nozzles.

[0006] As an optimization, the slag discharge pipe valve is a slag discharge vertical pipe that is connected downward from the center of the bottom of the heating slag discharge bin and is successively connected in series with a gate valve and a ball valve from top to bottom. In this way, when it needs to be closed, the ball valve failure and damage can be avoided by closing the gate valve and the ball valve successively. When it needs to be opened, the ball valve and the gate valve can be opened successively to avoid ball valve failure and damage. The bottom through valve pipeline adopts an automatic switch valve, and sealed slag discharge of the slag discharge tank can be carried out when the valve is closed.

[0007] As an optimization, the electric heater is an electric heater that heats the viscous substances falling into the heating slag discharge bin into a liquid state. In this way, it can not only ensure that the transmission path of the viscous substances to the heating slag discharge bin is not blocked through upward heat transfer, but also ensure the smooth discharge of the viscous substances through the slag discharge pipe valve.

[0008] As an optimization, the front-stage rapid cooling slag capture bin and the middle-stage rapid cooling slag removal bin adopt a precursor rapid cooling type core or a precursor rapid cooling and high-density contact heat exchange slag capture and slag removal core. The precursor rapid cooling type specifically means that the refrigerant inlet and outlet of the U-shaped rapid cooling medium circulation pipe are arranged upstream and downstream along the gas-phase process, and the rapid cooling slag capture and rapid cooling slag removal efficiency can be significantly improved through strong heat absorption at the front end. High-density contact refers to the arrangement method of high-density contact between the U-shaped rapid cooling medium circulation pipe and the gas-phase fluid, and the rapid cooling slag capture and rapid cooling slag removal efficiency can be significantly improved through high-intensity contact.

[0009] As an optimization, the front-stage rapid-cooling slag capture bin and the middle-stage rapid-cooling slag removal bin are vertical bin bodies composed of an upper-middle vertical cylinder section and a lower frustum section, and are connected downward to a sealed slag discharge tank through a flange bottom-through pipeline. The upstream side wall of the upper part of the vertical bin body of the front-stage rapid-cooling slag capture bin is connected to the top of the fluidized chlorination furnace through an upstream flange gas-phase process pipeline. The downstream side wall of the upper part of the vertical bin body of the front-stage rapid-cooling slag capture bin is connected to the upstream side wall of the upper part of the vertical bin body of the middle-stage rapid-cooling slag removal bin through a middle-stream flange gas-phase process pipeline. The downstream side wall of the upper part of the vertical bin body of the middle-stage rapid-cooling slag removal bin is connected to the middle side wall of the rear-stage rapid-cooling cyclone separator through a downstream flange gas-phase process pipeline, so as to gradually reduce the rapid-cooling slag capture, rapid-cooling slag removal and rapid-cooling cyclone separation at the connection parts, which is beneficial to gradually and deeply improve the purification efficiency. The upper-middle vertical cylinder section is used for rapid-cooling slag capture and rapid-cooling slag removal, and the lower frustum section is used for collecting the falling slag.

[0010] As an optimization, the top cover of the vertical bin body is densely provided with multiple groups of U-shaped rapid-cooling medium circulation pipes extending downward into the upper-middle vertical cylinder section. The front-stage rapid-cooling slag capture bin has a slag capture heat exchanger rapid-cooling medium inlet and a slag capture heat exchanger rapid-cooling medium outlet for the U-shaped rapid-cooling medium circulation pipes protruding from the top cover of the vertical bin body. The middle-stage rapid-cooling slag removal bin has a slag removal heat exchanger rapid-cooling medium inlet and a slag removal heat exchanger rapid-cooling medium outlet for the U-shaped rapid-cooling medium circulation pipes protruding from the top cover of the vertical bin body. This can significantly strengthen the rapid-cooling slag capture and rapid-cooling slag removal.

[0011] As an optimization, the U-shaped rapid-cooling medium circulation pipes are arranged in rows from the front upstream to the rear downstream, which is beneficial for the U-shaped rapid-cooling medium circulation pipes to capture each bundle of hot gas flows and achieve uniform rapid cooling; the plane where the U-shaped rapid-cooling medium circulation pipes are located is obliquely arranged with the direction of the gas flow to be cooled, which is more beneficial for the U-shaped rapid-cooling medium circulation pipes to capture each bundle of hot gas flows and better achieve uniform rapid cooling; and the rear row of obliquely arranged U-shaped rapid-cooling medium circulation pipes is located in the middle and rear of the adjacent obliquely arranged U-shaped rapid-cooling medium circulation pipes in the front row. The rapid-cooling medium inlet of the U-shaped rapid-cooling medium circulation pipe is located in front of the rapid-cooling medium outlet. With the rapid-cooling low-temperature end in the front, it can significantly improve the adsorption of the rapid-cooling medium circulation pipes to the hot gas flows. While strengthening the rapid-cooling and temperature reduction, it can indeed ensure that the gas flows that have not been rapidly cooled and temperature-reduced do not enter the next rapid-cooling process section, further guaranteeing and improving the quality and output of titanium tetrachloride.

[0012] As an optimization, the lower frustum section of the vertical bin body is provided with a bottom center slag discharge port, and the bottom center slag discharge port is connected downward to a sealed slag discharge tank through a flange bottom-through pipeline. In this way, the sediment falling in the vertical bin body will have an opportunity to deposit and adhere slowly around the bottom center slag discharge port, which is beneficial for the titanium tetrachloride in the sediment to have a further overflow opportunity, and is also beneficial for avoiding blocking the downward channel to the sealed slag discharge tank.

[0013] As an optimization, the downstream flange gas-phase process pipeline is tangentially introduced into the middle side wall of the downstream quench cyclone separator, which can improve the quality and efficiency of quench cyclone separation. The tangential introduction means that the downstream flange gas-phase process pipeline is introduced along the tangent of the circle where the cylindrical body of the downstream quench cyclone separator is located, which can significantly improve the quality and efficiency of quench cyclone separation.

[0014] This new type is a large-scale equipment for producing titanium tetrachloride using domestic titanium raw materials. It consists of a fluidized bed chlorination furnace, the inlet of the slag-catching heat exchanger, the outlet of the slag-catching heat exchanger, the front-stage quench slag catcher, the inlet of the slag-removing heat exchanger, the outlet of the slag-removing heat exchanger, the middle-stage quench slag remover, the downstream quench cyclone separator, a sealed slag discharge tank, ball valves, gate valves, electric heaters, distribution plates, chlorine pipes, and two-stage valves. All components are connected in sections by flanges; it is used for grading and separating various chlorides and dust in the titanium tetrachloride furnace gas. It is used to heat the agglomerates to a liquid state and discharge them through the slag discharge pipe at the bottom of the chlorination furnace, avoiding the agglomerates from blocking the sieve plate holes. The inner parts of the front-stage quench slag catcher, the middle-stage quench slag remover, the downstream quench cyclone separator, and the sealed slag discharge tank are all formed by corrosion-resistant, wear-resistant, and heat-insulating castable. All parts are connected in sections by flanges, and the inner parts are all formed by corrosion-resistant, wear-resistant, and heat-insulating castable. The front-stage quench slag catcher and the middle-stage quench slag remover are provided with sealed slag discharge tanks at the bottom to collect and process solid impurities. Its main structure is to add two-stage structures of the front-stage quench slag catcher and the middle-stage quench slag remover on the original basis, and the bottom of the chlorination furnace is designed into a funnel shape with an electric heater structure to heat the agglomerates to a liquid state and discharge them through the slag discharge pipe at the bottom of the chlorination furnace, avoiding the agglomerates from blocking the sieve plate holes and destroying the fluidization state; in the furnace gas system, heat exchangers are used to grade and separate chlorides and dust with different melting and boiling points in the titanium tetrachloride furnace gas, avoiding the condensation and caking of furnace gas impurities, better alleviating the problem of pipeline blockage in the furnace gas system, prolonging the continuous operation time of the fluidized bed chlorination, and reducing the number of furnace shutdowns. This new type is a titanium tetrachloride production equipment with a funnel-shaped furnace bottom equipped with electric heating for slag discharge and slag catchers and slag removers. That is, the bottom of the chlorination furnace is designed into a funnel shape with an electric heater for continuous slag discharge. And, the bottom slag discharge is controlled by two-stage valves for sealing. Also, slag catchers are used to capture slag materials such as calcium, magnesium, and iron in the slag catchers, and it can use domestic titanium raw materials (high calcium and magnesium, low grade) to produce titanium tetrachloride. A heat exchange slag remover is also designed, which is an internal tube-in-tube heat exchanger in the slag remover. Two-stage slag removal by the slag remover for fluidized bed chlorination can ensure that the furnace does not break down and production does not stop. That is, its structure adds two-stage structures of slag catchers and slag removers on the original basis, and collects and processes according to the physical properties of impurities in sections, avoiding the condensation and blockage of calcium and magnesium condensates in the system pipeline. It is composed of a front-stage quench slag catcher, a middle-stage quench slag remover, a downstream quench cyclone separator, and a sealed slag discharge tank. All components are connected in sections by flanges. The inner parts of the front-stage quench slag catcher, the middle-stage quench slag remover, the downstream quench cyclone separator, and the sealed slag discharge tank are all formed by corrosion-resistant, wear-resistant, and heat-insulating castable.

[0015] After adopting the above technical solution, the high-efficiency and environmentally friendly boiling chlorination device for high-quality titanium tetrachloride used in the production of titanium sponge from domestic titanium slag raw materials of the present utility model has a slag discharge port that prevents blockage, ensures smooth downward slag discharge, significantly improves the slag discharge efficiency, significantly enhances the purification efficiency of the gas-phase purification process pipeline, avoids blockage by adhesives, prolongs the continuous operation time of boiling chlorination, reduces the number of furnace shutdowns, and ensures the advantages of providing high-quality titanium tetrachloride raw materials for the production of titanium sponge using domestic titanium slag raw materials. Brief Description of the Drawings

[0016] Figure 1 It is a schematic side view structure diagram of the high-efficiency and environmentally friendly boiling chlorination device for high-quality titanium tetrachloride used in the production of titanium sponge from domestic titanium slag raw materials of the present utility model. Detailed Embodiment

[0017] As shown in the figure, the high-efficiency and environmentally friendly boiling chlorination device for high-quality titanium tetrachloride used in the production of titanium sponge from domestic titanium slag raw materials is vertically connected in series through a gas-phase process pipeline at the top of the vertical boiling chlorination furnace 1: it is respectively connected to the upper part of the front-stage rapid cooling slag capture bin 2 and the upper part of the middle-stage rapid cooling slag removal bin 3 through the bottom valve pipeline, and to the middle part of the rear-stage rapid cooling cyclone separator 4; a chlorine gas distribution plate 5 connected to the chlorine gas pipe 51 is arranged at the bottom inside the boiling chlorination furnace 1, and the slag discharge port in the middle of the bottom of the boiling chlorination furnace 1 is connected downward to a heating slag discharge bin 6 with an electric heater 61 inside and a slag discharge pipe valve connected downward. Among them, a shell-and-tube heat exchanger is arranged inside the front-stage slag capture bin and the middle-stage slag removal bin to condense the high-boiling-point impurities in the crude titanium tetrachloride system. At the bottom of the front-stage rapid cooling slag capture bin and the middle-stage rapid cooling slag removal bin, a sealed slag discharge tank is arranged, and a connecting pipeline is arranged between the front-stage rapid cooling slag capture bin, the middle-stage rapid cooling slag removal and the sealed slag discharge tank, which is controlled by an automatic switch valve to discharge slag regularly. Finally, the sealed slag tank collecting solid impurities is unloaded for impurity treatment. The bottom of the chlorination furnace is designed as a funnel type with electric heating for continuous slag discharge. Two-stage valves are arranged on the slag discharge pipe at the bottom of the chlorination furnace to control the seal. Using the vertical boiling chlorination furnace to connect the gas-phase process pipeline at the top is beneficial to removing impurities when the gas flow rises. When the gas-phase process pipeline is connected in series to the upper part of the front-stage rapid cooling slag capture bin and the upper part of the middle-stage rapid cooling slag removal bin, the large downward heat exchange space is beneficial to ensuring sufficient downward heat exchange slag capture and slag removal travel, ensuring that the temperature of the sinking slag after slag capture and slag removal can drop to the required temperature, avoiding high-temperature flutter and affecting the subsequent purification process; the small upward heat exchange space can make the introduced gas flow obtain sufficient downward driving force as much as possible while meeting the necessary introduction of gas flow buffer needs, which is beneficial to throwing the slag carried by the gas flow downward, thereby improving the slag discharge and slag capture efficiency. Connecting the gas-phase process pipeline to the middle part of the rear-stage rapid cooling cyclone separator is beneficial to both the upward purification of the gas flow and the downward movement of the sediment, playing a better role in rapid cooling and cyclone separation and purification. A chlorine gas distribution plate connected to the chlorine gas pipe is arranged at the bottom inside the boiling chlorination furnace, and the slag discharge port in the middle of the bottom of the boiling chlorination furnace is connected downward to a heating slag discharge bin with an electric heater inside and a slag discharge pipe valve connected downward. In this way, the electric heater can heat the viscous substances falling into the heating slag discharge bin, and then heat the slag discharge port and the chlorine gas distribution plate above, avoiding blocking the slag discharge port and the chlorine gas distribution plate, thus playing a role in preventing blockage and ensuring smooth downward slag discharge. Compared with the prior art, the main advantages and effects of this new type are as follows: 1. It can use domestic high-calcium and magnesium-rich titanium materials for production, collect and process them in sections according to the physical properties of the impurity condensates, avoid the blockage of the system pipeline by calcium chloride and magnesium chloride condensates, better alleviate the blockage problem of the furnace gas pipeline, extend the continuous operation time of boiling chlorination, and reduce the number of furnace shutdowns; 2. It can make the heated adhesive substances in a liquid state and discharge them through the slag discharge pipe at the bottom of the chlorination furnace, avoid the blockage of the sieve plate holes by the adhesive substances, extend the continuous operation time of boiling chlorination, and reduce the number of furnace shutdowns.It has an anti-blocking slag discharge port, which ensures smooth downward slag discharge, significantly improves the slag discharge efficiency, significantly enhances the purification efficiency of the gas-phase purification process pipeline, avoids blockage by adhesives, prolongs the continuous operation time of fluidized bed chlorination, reduces the number of furnace shutdowns, and ensures the advantages of providing high-quality titanium tetrachloride raw materials for the production of titanium sponge using domestic titanium slag raw materials.

[0018] Specifically, the bottom of the fluidized bed chlorination furnace 1 is a frustum of a cone with a wider top and a narrower bottom. Inside the lower part of the bottom of the frustum-shaped fluidized bed chlorination furnace 1, a chlorine distribution plate 5 is provided, and the chlorine distribution plate 5 is horizontally connected and sealed through a chlorine pipe 51 passing through the side wall of the bottom of the frustum-shaped chlorination furnace 1.

[0019] Specifically, the slag discharge pipe valve is a slag discharge vertical pipe 7 that is connected downward from the center of the bottom of the heating slag discharge bin 6 and is serially connected with a gate valve 71 and a ball valve 72 from top to bottom. The bottom through valve pipeline uses an automatic switch valve 91, and sealed slag discharge of the slag discharge tank can be carried out when the valve is closed.

[0020] Specifically, the electric heater 61 is an electric heater 61 that heats the viscous substances falling into the heating slag discharge bin into a liquid state.

[0021] Specifically, the front-stage rapid cooling slag capture bin and the middle-stage rapid cooling slag removal bin adopt a precursor rapid cooling type core or a precursor rapid cooling and high-density contact heat exchange slag capture and slag removal core. The precursor rapid cooling type specifically means that the refrigerant inlet and outlet of the U-shaped rapid cooling medium circulation pipe are arranged upstream and downstream along the gas phase process. High density contact means the arrangement method of the U-shaped rapid cooling medium circulation pipe in high-density contact with the gas-phase fluid.

[0022] Specifically, the front-stage rapid cooling slag capture bin 2 and the middle-stage rapid cooling slag removal bin 3 are vertical bin bodies composed of an upper middle vertical cylinder section and a lower frustum section, and are connected downward through a flange bottom through pipeline to a sealed slag discharge tank 9; the upstream side wall of the upper part of the vertical bin body of the front-stage rapid cooling slag capture bin is connected to the top of the fluidized bed chlorination furnace 1 through an upstream flange gas phase process pipeline, the downstream side wall of the upper part of the vertical bin body of the front-stage rapid cooling slag capture bin 2 is connected to the upstream side wall of the upper part of the vertical bin body of the middle-stage rapid cooling slag removal bin 3 through a middle flange gas phase process pipeline, and the downstream side wall of the upper part of the vertical bin body of the middle-stage rapid cooling slag removal bin 3 is connected to the middle side wall of the rear-stage rapid cooling cyclone separator 4 through a downstream flange gas phase process pipeline, so as to gradually reduce the rapid cooling slag capture, rapid cooling slag removal and rapid cooling cyclone separation at the connection part. The upper middle vertical cylinder section is used for rapid cooling slag capture and rapid cooling slag removal, and the lower frustum section is used for collecting the falling slag.

[0023] More specifically, the top cover of the vertical bin body is densely provided with multiple groups of U-shaped rapid cooling medium circulation pipes 23 extending downward into the upper middle vertical cylinder section. The front-stage rapid cooling slag capture bin 2 extends out of the rapid cooling medium inlet and the rapid cooling medium outlet of the slag capture heat exchanger of the U-shaped rapid cooling medium circulation pipe on the top cover of the vertical bin body, and the middle-stage rapid cooling slag removal bin 3 extends out of the rapid cooling medium inlet and the rapid cooling medium outlet of the slag removal heat exchanger of the U-shaped rapid cooling medium circulation pipe on the top cover of the vertical bin body.

[0024] More specifically, the U-shaped quench medium circulation pipes are arranged in rows from the upstream front to the downstream rear. The elevation where the U-shaped quench medium circulation pipes 23 are located is obliquely arranged with respect to the direction of the airflow to be cooled. Moreover, the rear row of obliquely arranged U-shaped quench medium circulation pipes 23 is located behind and in the middle of the adjacent obliquely arranged U-shaped quench medium circulation pipes 23 in the front row. The quench medium inlet 81 of the U-shaped quench medium circulation pipe 23 is located in front of the quench medium outlet 82.

[0025] More specifically, a bottom central slag discharge port is provided in the lower frustum section of the vertical silo body. The bottom central slag discharge port is connected downward to the sealed slag discharge tank 9 through a bottom flange connecting pipe.

[0026] Specifically, the downstream flange gas-phase flow pipeline is tangentially introduced into the middle side wall of the rear-stage quench cyclone separator 4. The tangential introduction means that the downstream flange gas-phase flow pipeline is introduced along the tangent of the circle where the cylindrical body of the rear-stage quench cyclone separator 4 is located.

[0027] This new type is a large-scale equipment for producing titanium tetrachloride using domestic titanium raw materials. It consists of a fluidized bed chlorination furnace, the inlet of the slag-catching heat exchanger, the outlet of the slag-catching heat exchanger, the front-stage rapid cooling slag catcher, the inlet of the slag-removing heat exchanger, the outlet of the slag-removing heat exchanger, the middle-stage rapid cooling slag remover, the rear-stage rapid cooling cyclone separator, a sealed slag discharge tank, a ball valve, a gate valve, an electric heater, a distribution plate, a chlorine pipe, and two-stage valves. All components are connected in sections by flanges; it is used for grading and separating various chlorides and dust in the titanium tetrachloride furnace gas. It is used to heat the agglomerates to a liquid state and discharge them through the slag discharge pipe at the bottom of the chlorination furnace to avoid the agglomerates blocking the sieve plate holes. The inner parts of the front-stage rapid cooling slag catcher, the middle-stage rapid cooling slag remover, the rear-stage rapid cooling cyclone separator, and the sealed slag discharge tank are all formed by corrosion-resistant, wear-resistant, and heat-insulating castable. All parts are connected in sections by flanges, and the inner parts are all formed by corrosion-resistant, wear-resistant, and heat-insulating castable. The front-stage rapid cooling slag catcher and the middle-stage rapid cooling slag remover are provided with sealed slag discharge tanks at the bottom to collect and process solid impurities. Its main structure adds two-stage structures of the front-stage rapid cooling slag catcher and the middle-stage rapid cooling slag remover on the original basis, and the bottom of the chlorination furnace is designed into a funnel shape and equipped with an electric heater structure to heat the agglomerates to a liquid state and discharge them through the slag discharge pipe at the bottom of the chlorination furnace to avoid the agglomerates blocking the sieve plate holes and destroying the fluidization; in the furnace gas system, heat exchangers are used to grade and separate chlorides and dust with different melting and boiling points in the titanium tetrachloride furnace gas to avoid the condensation and caking of furnace gas impurities, better relieve the blockage problem of the furnace gas system pipeline, extend the continuous operation time of fluidized bed chlorination, and reduce the number of furnace shutdowns. This new type is a titanium tetrachloride production equipment with a funnel-shaped furnace bottom equipped with an electric heating slag discharge and slag catchers and slag removers. That is, the bottom of the chlorination furnace is designed into a funnel shape and equipped with an electric heater for continuous slag discharge. Moreover, the bottom slag discharge is controlled and sealed by two-stage valves. The slag catchers are used to capture slag materials such as calcium, magnesium, and iron in the slag catchers, and it can produce titanium tetrachloride using domestic titanium raw materials (high calcium and magnesium, low grade). A heat exchange slag remover is also designed, which is an internal tube heat exchanger in the slag remover. Two-stage slag removal of the fluidized bed chlorination method is carried out, and the furnace can operate without stopping production. That is, its structure adds two-stage structures of slag catchers and slag removers on the original basis, and collects and processes according to the physical properties of impurities in sections to avoid the condensation of calcium and magnesium condensates blocking the system pipeline. It consists of the front-stage rapid cooling slag catcher, the middle-stage rapid cooling slag remover, the rear-stage rapid cooling cyclone separator, and the sealed slag discharge tank. All components are connected in sections by flanges. The inner parts of the front-stage rapid cooling slag catcher, the middle-stage rapid cooling slag remover, the rear-stage rapid cooling cyclone separator, and the sealed slag discharge tank are all formed by corrosion-resistant, wear-resistant, and heat-insulating castable.

[0028] In summary, the high-efficiency and environmentally friendly fluidized bed chlorination device for producing high-quality titanium tetrachloride from domestic titanium slag raw materials of this utility model has a slag discharge port that prevents blockage, ensures smooth downward slag discharge, significantly improves the slag discharge efficiency, significantly enhances the purification efficiency of the gas-phase purification process pipeline, avoids blockage by agglomerates, extends the continuous operation time of fluidized bed chlorination, reduces the number of furnace shutdowns, and ensures the advantage of providing high-quality titanium tetrachloride raw materials for producing titanium sponge using domestic titanium slag raw materials.

Claims

1. An efficient and environmentally friendly fluidized chlorination device for high-quality titanium tetrachloride used in the production of titanium sponge from domestic titanium slag raw materials, characterized in that The top of the vertical boiling chlorination furnace is connected in series through a gas-phase process pipeline: it is respectively connected to the upper part of the front-stage rapid cooling slag capture bin and the upper part of the middle-stage rapid cooling slag removal bin of the sealed slag discharge tank through the bottom valve pipeline, and is connected to the middle part of the rear-stage rapid cooling cyclone separator; a chlorine gas distribution plate connected to the chlorine gas pipe is arranged at the bottom inside the boiling chlorination furnace, and the slag discharge port in the middle of the bottom of the boiling chlorination furnace is connected downward to a heating slag discharge bin with an electric heater inside and a slag discharge pipe valve connected downward.

2. The high-efficiency and environmentally friendly boiling chlorination device for high-quality titanium tetrachloride used in the production of titanium sponge from domestic titanium slag raw materials according to claim 1, characterized in that The bottom of the boiling chlorination furnace is a frustum-shaped with a wider top and a narrower bottom. A chlorine gas distribution plate is arranged at the lower part inside the frustum-shaped bottom of the boiling chlorination furnace, and the chlorine gas distribution plate is horizontally connected to the chlorine gas pipe that penetrates through the side wall of the frustum-shaped bottom of the boiling chlorination furnace in a sealed manner.

3. The high-efficiency and environmentally friendly boiling chlorination device for high-quality titanium tetrachloride used in the production of titanium sponge from domestic titanium slag raw materials according to claim 1, characterized in that The slag discharge pipe valve is a slag discharge vertical pipe that is connected downward from the center of the bottom of the heating slag discharge bin and is successively connected in series with a gate valve and a ball valve from top to bottom; the bottom valve pipeline adopts an automatic switch valve.

4. The high-efficiency and environmentally friendly boiling chlorination device for high-quality titanium tetrachloride used in the production of titanium sponge from domestic titanium slag raw materials according to claim 1, characterized in that The electric heater is an electric heater that heats the viscous substances falling into the heating slag discharge bin into a liquid state.

5. The high-efficiency and environmentally friendly boiling chlorination device for high-quality titanium tetrachloride used in the production of titanium sponge from domestic titanium slag raw materials according to claim 1, characterized in that The front-stage rapid cooling slag capture bin and the middle-stage rapid cooling slag removal bin adopt a precursor rapid cooling type core or adopt a precursor rapid cooling and high-density contact heat exchange slag capture and slag removal core.

6. The high-efficiency and environmentally friendly boiling chlorination device for high-quality titanium tetrachloride used in the production of titanium sponge from domestic titanium slag raw materials according to claim 1, characterized in that The front-stage rapid cooling slag capture bin and the middle-stage rapid cooling slag removal bin are vertical bin bodies composed of an upper middle vertical cylinder section and a lower frustum section, and are connected downward to the sealed slag discharge tank through a flange bottom valve pipeline. The upstream side wall of the upper part of the vertical bin body of the front-stage rapid cooling slag capture bin is connected to the top of the boiling chlorination furnace through an upstream flange gas-phase process pipeline. The downstream side wall of the upper part of the vertical bin body of the front-stage rapid cooling slag capture bin is connected to the upstream side wall of the upper part of the vertical bin body of the middle-stage rapid cooling slag removal bin through a middle-stream flange gas-phase process pipeline. The downstream side wall of the upper part of the vertical bin body of the middle-stage rapid cooling slag removal bin is connected to the middle side wall of the rear-stage rapid cooling cyclone separator through a downstream flange gas-phase process pipeline.

7. The high-efficiency and environmentally friendly boiling chlorination device for high-quality titanium tetrachloride used in the production of titanium sponge from domestic titanium slag raw materials according to claim 6, characterized in that The top covers of the vertical bin bodies of the front-stage rapid cooling slag capture bin and the middle-stage rapid cooling slag removal bin are densely provided with multiple groups of U-shaped rapid cooling medium circulation pipes that extend downward into the upper middle vertical cylinder section. The front-stage rapid cooling slag capture bin extends out of the rapid cooling medium inlet and the rapid cooling medium outlet of the slag capture heat exchanger of the U-shaped rapid cooling medium circulation pipe on the top cover of the vertical bin body. The middle-stage rapid cooling slag removal bin extends out of the rapid cooling medium inlet and the rapid cooling medium outlet of the slag removal heat exchanger of the U-shaped rapid cooling medium circulation pipe on the top cover of the vertical bin body.

8. The high-efficiency and environmentally friendly boiling chlorination device for high-quality titanium tetrachloride used in the production of titanium sponge from domestic titanium slag raw materials according to claim 7, characterized in that The U-shaped rapid cooling medium circulation pipes are arranged in rows from the front upstream to the rear downstream. The plane where the U-shaped rapid cooling medium circulation pipes are located is obliquely arranged with respect to the direction of the airflow to be cooled, and the rear row of obliquely arranged U-shaped rapid cooling medium circulation pipes is located behind the middle of the adjacent front row of obliquely arranged U-shaped rapid cooling medium circulation pipes. The rapid cooling medium inlet of the U-shaped rapid cooling medium circulation pipe is located in front of the rapid cooling medium outlet.

9. The high-efficiency and environmentally friendly boiling chlorination device for high-quality titanium tetrachloride used in the production of titanium sponge from domestic titanium slag raw materials according to claim 6, characterized in that The lower frustum section of the vertical bin body is provided with a bottom center slag discharge port, and the bottom center slag discharge port is connected downward to the sealed slag discharge tank through a flange bottom valve pipeline.

10. The high-efficiency and environmentally friendly boiling chlorination device for high-quality titanium tetrachloride used in the production of titanium sponge from domestic titanium slag raw materials according to claim 6, characterized in that The downstream flange gas-phase process pipeline is connected to the middle side wall of the rear-stage rapid cooling cyclone separator, and the downstream flange gas-phase process pipeline is tangentially introduced into the middle side wall of the rear-stage rapid cooling cyclone separator.

Images