Oxidation apparatus and titanium dioxide production line

Abstract

The application discloses an oxidation device and a titanium dioxide production line, and through the addition of a branch pipe, titanium tetrachloride raw materials in a liquid inlet pipe can be directly introduced into a feeding ring, so that the titanium tetrachloride enters the branch pipe after the oxidation load is increased to a specified load, and a secondary oxidation reaction is carried out by using the high temperature generated by the oxidation reaction of the titanium tetrachloride at the feeding ring and unreacted oxygen. Under the same production capacity before and after the transformation, the liquid inlet quantity proportion of the titanium tetrachloride preheater is reduced, the natural gas consumption is reduced, the flame temperature is reduced, the heat exchange coil is effectively protected, the system temperature after the reaction is reduced, the heat reaching the subsequent sections is reduced, and thus the performance and service life of the subsequent equipment are ensured.

Description

Technical Field

[0001] This application relates to the field of mining technology, and in particular to an oxidation device and a titanium dioxide production line. Background Technology

[0002] Titanium dioxide (TiO2) is an important and widely used white inorganic pigment, renowned for its excellent optical properties, chemical stability, and hiding power. It has a variety of applications in multiple industries, including but not limited to coatings, plastics, paper, and cosmetics.

[0003] Currently, the core process of conventional titanium dioxide oxidation using the chloride process involves the oxidation reaction of titanium tetrachloride at the feeding ring. The titanium tetrachloride participating in the reaction needs to be heated by a titanium tetrachloride preheater before reacting with high-temperature oxygen at the feeding ring (the reaction conditions are high temperature). The exothermic reaction generates a large amount of high-temperature chlorine gas, and at the same time, excess high-temperature oxygen that has not been completely reacted enters the subsequent process, causing high temperatures and reduced strength of subsequent equipment (such as cooling pipes, bag filters, etc.) and affecting their service life. Utility Model Content

[0004] The purpose of this application is to provide an oxidation device and a titanium dioxide production line that reduces the heat reaching subsequent stages, thereby ensuring the performance and service life of the subsequent equipment.

[0005] The embodiments of this application can be implemented as follows:

[0006] In a first aspect, this utility model provides an oxidation device, including a preheater, an oxidation furnace, and a feeding ring;

[0007] The inlet pipe for supplying titanium tetrachloride is connected to the inlet of the preheater, and the outlet of the preheater is connected to the feeding ring, which is located at the inlet of the oxidation furnace.

[0008] One of the pipes has its inlet end connected to the inlet pipe and its outlet end connected to the preheater.

[0009] In an optional embodiment, the oxidation device further includes a quenching end connected to the feeding ring, and the liquid outlet end of the branch pipe connected to the quenching end.

[0010] In an optional embodiment, the quench end has a first inlet and a second inlet, the first inlet being connected to the branch pipe for introducing titanium tetrachloride, and the second inlet being for introducing a protective gas.

[0011] In an optional implementation, the quenching end can be connected to an external cooling device.

[0012] In an optional embodiment, the branch pipe is provided with a regulating valve.

[0013] In an optional embodiment, the branch pipe is equipped with a flow meter.

[0014] In an optional embodiment, an aluminum trichloride generator is provided between the preheater and the feeding ring.

[0015] In an optional embodiment, the oxidation apparatus further includes a thermometer and a toluene pump. The thermometer is disposed on the oxidation furnace near the feeding ring and is used to detect the oxygen temperature at the feeding ring. The toluene pump is connected to the feeding ring and can adjust its rotation speed according to the thermometer reading.

[0016] In an optional implementation, the thermometer is a thermocouple.

[0017] Secondly, this utility model provides a titanium dioxide production line, including the oxidation device described in any of the foregoing embodiments.

[0018] The beneficial effects of the embodiments of this application include, for example:

[0019] By adding a branch pipe, titanium tetrachloride raw material in the inlet pipe can be directly introduced to the feeding ring. After the oxidation load is increased to the specified load, the branch pipe is opened to allow titanium tetrachloride to enter. The high temperature generated by the original oxidation reaction of titanium tetrachloride and the unreacted oxygen at the feeding ring are used for a secondary oxidation reaction. Under the same output conditions before and after the modification, the proportion of liquid inlet to the titanium tetrachloride preheater is reduced, which reduces natural gas consumption, reduces flame temperature, effectively protects the heat exchange coil, and reduces the temperature of the system after the reaction, thus reducing the heat reaching the subsequent process and ensuring the performance and service life of the subsequent equipment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the oxidation apparatus according to an embodiment of this application.

[0022] Icons: 10-Inlet pipe; 20-Preheater; 30-Feeding ring; 40-Oxidation furnace; 41-Thermometer; 50-Branch pipe; 51-Regulating valve; 52-Flow meter; 60-Quick cooling end; 70-Aluminum trichloride generator. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not 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 on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] The following is in conjunction with the appendix Figure 1This application provides a detailed description of some embodiments. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0030] This application discloses an oxidation apparatus, which includes a preheater 20, an oxidation furnace 40, and a feeding ring 30;

[0031] The inlet pipe 10 for supplying titanium tetrachloride is connected to the inlet of the preheater 20, and the outlet of the preheater 20 is connected to the feeding ring 30, which is located at the inlet of the oxidation furnace 40.

[0032] One of the pipes 50 has its inlet end connected to the inlet pipe 10 and its outlet end connected to the preheater 20.

[0033] In this way, by adding a branch pipe 50, the titanium tetrachloride raw material in the inlet pipe 10 can be directly introduced into the feeding ring 30. After the oxidation load is increased to the specified load, the branch pipe 50 is opened to allow titanium tetrachloride to enter. The high temperature generated by the original oxidation reaction of titanium tetrachloride and the unreacted oxygen at the feeding ring 30 are used for secondary oxidation reaction. Under the same output conditions before and after the modification, the proportion of liquid entering the titanium tetrachloride preheater 20 is reduced, which reduces natural gas consumption, reduces flame temperature, effectively protects the heat exchange coil, and reduces the temperature of the system after the reaction, reducing the heat reaching the subsequent process, thereby ensuring the performance and service life of the subsequent equipment.

[0034] Specifically, the oxidation device also includes a quench end 60, which is connected to the feed ring 30. The branch pipe 50 and the liquid outlet end are connected to the quench end 60. The quench end 60 can be connected to an external cooling device (such as a lithium bromide unit, not shown) so that the quench end 60 can have a cooling effect. For example, the quench end 60 has a circulating water path so that the cooling medium can circulate between the cooling device and the quench end 60. In this way, the reaction products can be quickly cooled through the quench end 60.

[0035] The quench end 60 has a first inlet and a second inlet. The first inlet is connected to the branch pipe 50. The first inlet is used to introduce titanium tetrachloride, and the second inlet is used to introduce protective gas. In the initial oxidation reaction, the first inlet is blocked and the second inlet is opened to introduce protective gas. After the oxidation load is increased to the specified load, the first inlet is opened and the second inlet can be closed so that the titanium tetrachloride raw material in the liquid inlet pipe 10 can enter the feeding ring 30 through the branch pipe 50, thereby using the high temperature generated by the titanium tetrachloride oxidation reaction at the feeding ring 30 and the unreacted oxygen to carry out a secondary oxidation reaction.

[0036] Branch pipe 50 is equipped with a regulating valve 51 to regulate the flow rate of titanium tetrachloride input to the quench end 60 and the feed ring 30 through branch pipe 50. Of course, branch pipe 50 is also equipped with a flow meter 52 to control the opening degree of regulating valve 51.

[0037] An aluminum trichloride generator 70 is installed between the preheater 20 and the feeding ring 30. In this way, the titanium tetrachloride that has passed through the preheater 20 enters the aluminum trichloride generator 70. Aluminum trichloride can act as a catalyst to help the oxidation reaction of titanium tetrachloride and improve the reaction efficiency.

[0038] The oxidation apparatus also includes a thermometer 41 and a toluene pump (not shown). The thermometer 41 is located on the oxidation furnace 40 near the feeding ring 30 and is a thermocouple. The thermometer 41 is used to detect the oxygen temperature at the feeding ring 30. The toluene pump is connected to the feeding ring 30 and can adjust its own speed according to the detection result of the thermometer 41, thereby regulating the toluene flow rate and controlling the oxygen temperature at the feeding ring 30 within a suitable range.

[0039] Furthermore, this application also discloses a titanium dioxide production line, which includes the oxidation device described in the above embodiments, and therefore also has the corresponding structure and beneficial effects.

[0040] In summary, this application discloses an oxidation device and a titanium dioxide production line. By adding a branch pipe 50, titanium tetrachloride raw material in the inlet pipe 10 can be directly introduced into the feeding ring 30. After the oxidation load is increased to the specified load, the branch pipe 50 is opened to allow titanium tetrachloride to enter. The high temperature generated by the original titanium tetrachloride oxidation reaction and the unreacted oxygen at the feeding ring 30 are used for a secondary oxidation reaction. Under the same output conditions before and after the modification, the proportion of liquid entering the titanium tetrachloride preheater 20 is reduced, reducing natural gas consumption, reducing flame temperature, effectively protecting the heat exchange coil, and reducing the system temperature after the reaction, thus reducing the heat reaching the subsequent process and ensuring the performance and service life of the subsequent equipment.

[0041] Finally, it should be noted that in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An oxidation apparatus, characterized in that, Includes preheater, oxidizer, and feeding ring; The inlet pipe for supplying titanium tetrachloride is connected to the inlet of the preheater, and the outlet of the preheater is connected to the feeding ring, which is located at the inlet of the oxidation furnace. One of the pipes has its inlet end connected to the inlet pipe and its outlet end connected to the preheater.

2. The oxidation apparatus according to claim 1, characterized in that, The oxidation device further includes a quenching end, which is connected to the feeding ring, and the liquid outlet end of the branch pipe is connected to the quenching end.

3. The oxidation apparatus according to claim 2, characterized in that, The quench end has a first inlet and a second inlet. The first inlet is connected to the branch pipe and is used to introduce titanium tetrachloride. The second inlet is used to introduce protective gas.

4. The oxidation apparatus according to claim 2, characterized in that, The quenching end can be connected to an external cooling device.

5. The oxidation apparatus according to claim 1, characterized in that, The branch pipe is equipped with a regulating valve.

6. The oxidation apparatus according to claim 1, characterized in that, The branch pipe is equipped with a flow meter.

7. The oxidation apparatus according to any one of claims 1-6, characterized in that, An aluminum trichloride generator is installed between the preheater and the feeding ring.

8. The oxidation apparatus according to claim 1, characterized in that, The oxidation device also includes a thermometer and a toluene pump. The thermometer is located on the oxidation furnace near the feeding ring and is used to detect the temperature of the oxygen at the feeding ring. The toluene pump is connected to the feeding ring and can adjust its rotation speed according to the thermometer reading.

9. The oxidation apparatus according to claim 8, characterized in that, The thermometer is a thermocouple.

10. A titanium dioxide production line, characterized in that, Includes the oxidation apparatus according to any one of claims 1-9.

Images