System for reducing carbon content in refined titanium tetrachloride and titanium dioxide production system

Abstract

The utility model relates to the technical field of titanium dioxide chloride production, in particular to a system for reducing the carbon content in refined titanium tetrachloride and a titanium dioxide production system. The system for reducing the carbon content in the refined titanium tetrachloride comprises an evaporation device, a rectification device, a condensation device, a perspective device, a vanadium content real-time detection device and a conversion valve, wherein the evaporation device, the rectification device, the condensation device and the conversion valve are connected in sequence; a first branch pipeline is arranged between the condensing device and the conversion valve, and the perspective device and the vanadium content real-time detection device are arranged on the first branch pipeline. According to the system for reducing the carbon content in the refined titanium tetrachloride, the carbon content in the refined titanium tetrachloride can be effectively reduced, the addition amount of mineral oil is accurately controlled, and the vanadium content in the refined titanium tetrachloride is accurately controlled within a qualified range.

Description

Technical Field

[0001] The utility model relates to the technical field of titanium tetrachloride production, and specifically, to a system for reducing the carbon content in refined titanium tetrachloride and a titanium dioxide production system. Background Art

[0002] Currently, mineral oil is commonly used as a vanadium removal reagent in the production of titanium dioxide by the chlorination process. Since the vanadium content in crude titanium tetrachloride is unstable, in order to ensure that the vanadium content in titanium tetrachloride can meet the standard after removal, the addition amount of mineral oil is slightly excessive. Therefore, the obtained refined titanium tetrachloride contains a small amount of organic carbon impurities.

[0003] As an important equipment in the production process of the oxidation section of titanium tetrachloride for titanium dioxide production, the titanium tetrachloride preheater is mainly responsible for preheating titanium tetrachloride to about 350°C in advance during the oxidation reaction process, and then transporting titanium tetrachloride into the oxidation reactor for oxidation reaction. During the preheating process of titanium tetrachloride, due to the presence of a small amount of organic carbon in titanium tetrachloride, carbon deposits will be generated inside the preheater. After long-term enrichment, a thick layer will be formed, seriously affecting the heat exchange effect of the preheater, and even causing corrosion and perforation of the heat exchange pipes of the preheater, requiring shutdown for maintenance, which seriously affects the startup rate of the oxidation section. After the carbon deposits fall off, they will be introduced into the oxidation furnace together with refined titanium tetrachloride, and then into the titanium dioxide base material, which will also affect the quality of titanium dioxide.

[0004] In view of this, the present utility model is specifically proposed. Content of the Utility Model

[0005] A system for reducing the carbon content in refined titanium tetrachloride provided by the present utility model includes: an evaporation device, a rectification device, a condensation device, a perspective device, a real-time vanadium content detection device, and a diversion valve, which can effectively reduce the carbon content in refined titanium tetrachloride, accurately control the addition amount of mineral oil, and accurately control the vanadium content in refined titanium tetrachloride within the qualified range.

[0006] In order to achieve the above object of the present utility model, the following technical solutions are specifically adopted:

[0007] One aspect of the present utility model relates to a system for reducing the carbon content in refined titanium tetrachloride, including: an evaporation device, a rectification device, a condensation device, a perspective device, a real-time vanadium content detection device, and a diversion valve;

[0008] Wherein, the evaporation device, the rectification device, the condensation device, and the diversion valve are connected in sequence;

[0009] A first branch pipeline is provided between the condensation device and the diversion valve, and the perspective device and the real-time vanadium content detection device are provided on the first branch pipeline.

[0010] The system for reducing the carbon content in refined titanium tetrachloride can effectively reduce the carbon content in refined titanium tetrachloride, accurately control the addition amount of mineral oil, and accurately control the vanadium content in refined titanium tetrachloride within the qualified range.

[0011] Preferably, the perspective device includes: a glass sight glass.

[0012] Preferably, the vanadium content real-time detection device includes: an online chromaticity meter.

[0013] Preferably, the system for reducing the carbon content in refined titanium tetrachloride further includes: a crude titanium tetrachloride pipeline.

[0014] Preferably, the first outlet of the steering valve is connected to the crude titanium tetrachloride pipeline.

[0015] Preferably, the outlet of the crude titanium tetrachloride pipeline is connected to a crude titanium tetrachloride storage device.

[0016] Preferably, the system for reducing the carbon content in refined titanium tetrachloride further includes: a refined titanium tetrachloride pipeline.

[0017] Preferably, the second outlet of the steering valve is connected to the refined titanium tetrachloride pipeline.

[0018] Preferably, the outlet of the refined titanium tetrachloride pipeline is connected to a refined titanium tetrachloride storage device.

[0019] Preferably, the outlet of the first branch pipeline is connected to a crude titanium tetrachloride storage device.

[0020] Preferably, a crude titanium tetrachloride inlet is provided on the evaporation device.

[0021] Preferably, a mineral oil inlet is provided on the evaporation device.

[0022] Another aspect of the present utility model further relates to a titanium dioxide production system, including the system for reducing the carbon content in refined titanium tetrachloride described above.

[0023] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0024] (1) For the system for reducing the carbon content in refined titanium tetrachloride provided by the present utility model, during normal operation, the central control operator adjusts the addition amount of mineral oil in a timely manner according to the vanadium value of refined titanium tetrachloride fed back by the vanadium content real-time detection device. More preferably, the addition amount of mineral oil and the vanadium value of refined titanium tetrachloride are subjected to DCS control interlock to realize automatic adjustment of the oil addition amount according to the change of the vanadium content in refined titanium. When the vanadium value gradually increases, the oil amount is also automatically adjusted to increase; when the vanadium value gradually decreases, the oil amount is also automatically adjusted to decrease to achieve accurate control of the oil addition amount.

[0025] (2) The system for reducing the carbon content in refined titanium tetrachloride provided by the present utility model accurately controls the vanadium content in refined titanium tetrachloride within the qualified range through a vanadium content real-time detection device, that is, it timely adjusts the addition amount of mineral oil by feeding back the change of vanadium content through an on-line chromaticity meter, and then accurately controls the addition amount of mineral oil to avoid over-addition. In addition, the operation of reducing mineral oil is carried out every day to remove the excess mineral oil in the refining system, thereby further reducing the carbon content in refined titanium tetrachloride and finally meeting the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 FIG. is a schematic structural diagram of the system for reducing the carbon content in refined titanium tetrachloride provided by the embodiment of the present utility model.

[0028] REFERENCE SIGNS:

[0029] 1 - Evaporation device;

[0030] 2 - Rectification device;

[0031] 3 - Condensation device;

[0032] 4 - Perspective device;

[0033] 5 - Vanadium content real-time detection device;

[0034] 6 - Diverting valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The following will clearly and completely describe the technical solutions of the present utility model in conjunction with the drawings and specific embodiments. However, those skilled in the art will understand that the described embodiments are some embodiments of the present utility model, not all of them, and are only used to illustrate the present utility model and should not be construed as limiting the scope of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model. Those not specified in the embodiments are carried out according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments not specified in the manufacturer are all conventional products that can be obtained through commercial purchase.

[0036] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0037] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0038] One aspect of the present utility model relates to a system for reducing the carbon content in refined titanium tetrachloride, including: an evaporation device 1, a rectification device 2, a condensation device 3, a perspective device 4, a vanadium content real-time detection device 5, and a steering valve 6;

[0039] Among them, the evaporation device 1, the rectification device 2, the condensation device 3, and the steering valve 6 are connected in sequence;

[0040] A first branch pipeline is arranged between the condensation device 3 and the steering valve 6, and the perspective device 4 and the vanadium content real-time detection device 5 are arranged on the first branch pipeline.

[0041] For the system for reducing the carbon content in refined titanium tetrachloride, during normal operation, the main operator in the central control adjusts the addition amount of mineral oil in a timely manner according to the vanadium value of refined titanium tetrachloride fed back by the vanadium content real-time detection device 5. More preferably, the addition amount of mineral oil and the vanadium value of refined titanium tetrachloride are subjected to DCS control interlock to realize the automatic adjustment of the oil addition amount according to the change of the vanadium content in refined titanium. When the vanadium value gradually increases, the oil amount is also automatically adjusted to increase. When the vanadium value gradually decreases, the oil amount is also automatically adjusted to decrease to achieve the precise control of the oil addition.

[0042] For the system for reducing the carbon content in refined titanium tetrachloride, the vanadium content in refined titanium tetrachloride is accurately controlled within the qualified range through the vanadium content real-time detection device 5, and then the addition amount of mineral oil is accurately controlled, so that it is not added excessively, and the daily operation of reducing mineral oil is carried out to remove the excess mineral oil from the refining system, thereby further reducing the carbon content in refined titanium tetrachloride and finally meeting the requirements.

[0043] The perspective device is used to observe the chromaticity of refined titanium tetrachloride and cooperate with the on-line chromaticity meter to operate normally.

[0044] The present utility model does not specifically limit the specific type of the perspective device 4, and any device in the art that can achieve the perspective function can be used to implement the technical solution of the present utility model. In some specific embodiments, the perspective device 4 includes, but is not limited to: a glass sight glass. The glass sight glass is a perspective window glass used under certain temperature and pressure conditions.

[0045] The real-time vanadium content detection device 5 adopted by the present utility model is an existing real-time detection device in the technical field. In some specific embodiments, the real-time vanadium content detection device 5 includes: an on-line chromaticity meter. The chromaticity meter is an instrument used to measure the color and color difference, brightness, fluorescent whiteness and various physical properties reflected by an object, and the on-line chromaticity meter has the function of measuring the changes of the color and the like reflected by an object in real time.

[0046] Further, the system for reducing the carbon content in refined titanium tetrachloride further includes: a crude titanium tetrachloride pipeline.

[0047] Further, the first outlet of the diverter valve 6 is connected to the crude titanium tetrachloride pipeline.

[0048] Further, the outlet of the crude titanium tetrachloride pipeline is connected to a crude titanium tetrachloride storage device.

[0049] Further, the system for reducing the carbon content in refined titanium tetrachloride further includes: a refined titanium tetrachloride pipeline.

[0050] Further, the second outlet of the diverter valve 6 is connected to the refined titanium tetrachloride pipeline.

[0051] Further, the outlet of the refined titanium tetrachloride pipeline is connected to a refined titanium tetrachloride storage device.

[0052] Further, the outlet of the first branch pipeline is connected to a crude titanium tetrachloride storage device.

[0053] Further, a crude titanium tetrachloride inlet is provided on the evaporation device 1 for injecting crude titanium tetrachloride into the evaporation device 1.

[0054] Further, a mineral oil inlet is provided on the evaporation device 1 for injecting mineral oil into the evaporation device 1.

[0055] In some specific embodiments, the system for reducing the carbon content in refined titanium tetrachloride includes an evaporator, a rectification column, a condenser, a glass sight glass, an on-line vanadium detector and a diverter valve 6;

[0056] The evaporator is designed with a thick titanium tetrachloride inlet pipe, a mineral oil addition pipe, and a slurry drain pipe; the top of the evaporator is connected to the rectification column through a connecting pipe, the rectification column is connected to the condenser through a connecting pipe, and the condenser is connected to the steering valve 6 through a connecting pipe; the steering valve 6 is connected to the thick titanium tetrachloride pipe through a branch connecting pipe, and the other branch is connected to the refined titanium tetrachloride tank through a connecting pipe; a glass sight glass and an on-line vanadium detector are successively designed through a connecting pipe between the condenser and the steering valve 6; the outlet pipe of the on-line vanadium detector is connected to the thick titanium tetrachloride tank.

[0057] Another aspect of the present invention also relates to a method for effectively reducing the carbon content in refined titanium tetrachloride. Using the system for reducing the carbon content in refined titanium tetrachloride, the method includes the following steps:

[0058] 1) Raise the reaction temperature of vanadium oxychloride and mineral oil in thick titanium tetrachloride to improve the reaction activity of mineral oil and reduce the addition amount of mineral oil;

[0059] 2) Conduct on-line detection of the change in vanadium content of the refined titanium tetrachloride condensed after vanadium removal, and adjust the addition amount of mineral oil according to the vanadium content in the refined titanium tetrachloride;

[0060] 3) Reduce the addition amount of mineral oil within a certain time every day to reduce the inventory of mineral oil in the system. If the vanadium in the obtained refined titanium tetrachloride exceeds the standard and the unqualified refined titanium tetrachloride is sent into the thick titanium tank; after removing the excess mineral oil in the system, resume the normal addition amount of mineral oil, and send the refined titanium tetrachloride into the refined titanium tetrachloride tank after the vanadium in the refined titanium tetrachloride is qualified.

[0061] Another aspect of the present invention also relates to a titanium dioxide production system, including the system for reducing the carbon content in refined titanium tetrachloride.

[0062] Example 1

[0063] The system for reducing the carbon content in refined titanium tetrachloride provided in this example, as Figure 1 shown, includes: an evaporation device 1, a rectification device 2, a condensation device 3, a perspective device 4, a real-time vanadium content detection device 5, and a steering valve 6;

[0064] Among them, the evaporation device 1, the rectification device 2, the condensation device 3, and the steering valve 6 are connected in sequence;

[0065] A first branch pipeline is arranged between the condensation device 3 and the steering valve 6, and the perspective device 4 and the real-time vanadium content detection device 5 are arranged on the first branch pipeline;

[0066] The perspective device 4 is a glass sight glass;

[0067] The real-time vanadium content detection device 5 is an on-line chromaticity meter;

[0068] The system for reducing the carbon content in refined titanium tetrachloride further includes: a crude titanium tetrachloride pipeline; the first outlet of the diversion valve 6 is connected to the crude titanium tetrachloride pipeline; the outlet of the crude titanium tetrachloride pipeline is connected to a crude titanium tetrachloride storage device;

[0069] The system for reducing the carbon content in refined titanium tetrachloride further includes: a refined titanium tetrachloride pipeline; the second outlet of the diversion valve 6 is connected to the refined titanium tetrachloride pipeline; the outlet of the refined titanium tetrachloride pipeline is connected to a refined titanium tetrachloride storage device;

[0070] The outlet of the first pipeline is connected to the crude titanium tetrachloride storage device;

[0071] The evaporation device 1 is provided with a crude titanium tetrachloride inlet; the evaporation device 1 is provided with a mineral oil inlet.

[0072] Embodiment 2

[0073] A titanium dioxide production system includes the system for reducing the carbon content in refined titanium tetrachloride of Embodiment 1.

[0074] Although the present invention has been illustrated and described with specific embodiments, it should be realized that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; those of ordinary skill in the art should understand that: without departing from the spirit and scope of the present invention, the technical solutions described in the foregoing embodiments can be modified, or some or all of the technical features can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention; therefore, this means that all such replacements and modifications that fall within the scope of the present invention are included in the appended claims.

Claims

1. A system for reducing the carbon content in refined titanium tetrachloride, characterized in that: include: Evaporation device, distillation device, condensation device, perspective device, vanadium content real-time detection device and steering valve; Wherein, the evaporation device, the distillation device, the condensation device and the steering valve are connected in sequence; A first branch pipeline is arranged between the condensing device and the steering valve, and the perspective device and the vanadium content real-time detection device are arranged on the first branch pipeline.

2. The system for reducing the carbon content in refined titanium tetrachloride according to claim 1, characterized in that: The perspective device comprises: a glass sight glass.

3. The system for reducing the carbon content in refined titanium tetrachloride according to claim 1, characterized in that: The real-time detection device for vanadium content comprises: an online colorimeter.

4. The system for reducing the carbon content in refined titanium tetrachloride according to claim 1, characterized in that: The system for reducing the carbon content in refined titanium tetrachloride also includes: a crude titanium tetrachloride pipeline; The first outlet of the diverter valve is connected to the crude titanium tetrachloride pipeline.

5. The system for reducing the carbon content in refined titanium tetrachloride according to claim 4, characterized in that: The outlet of the crude titanium tetrachloride pipeline is connected to the crude titanium tetrachloride storage device.

6. The system for reducing the carbon content in refined titanium tetrachloride according to claim 1, characterized in that: The system for reducing the carbon content in refined titanium tetrachloride also includes: a refined titanium tetrachloride pipeline; The second outlet of the diverter valve is connected to the refined titanium tetrachloride pipeline.

7. The system for reducing the carbon content in refined titanium tetrachloride according to claim 6, characterized in that: The outlet of the refined titanium tetrachloride pipeline is connected to the refined titanium tetrachloride storage device.

8. The system for reducing the carbon content in refined titanium tetrachloride according to claim 1, characterized in that: The outlet of the first branch pipeline is connected to a crude titanium tetrachloride storage device.

9. The system for reducing the carbon content in refined titanium tetrachloride according to claim 1, characterized in that: The evaporation device is provided with a crude titanium tetrachloride inlet; The evaporation device is provided with a mineral oil inlet.

10. A titanium dioxide production system, characterized in that: A system for reducing the carbon content in refined titanium tetrachloride comprising any one of claims 1 to 9.

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