Vanadium slag discharging system for ore pulp evaporating furnace

Abstract

The utility model belongs to the field of titanium dioxide chloride. The utility model provides a vanadium slag discharging system for an ore pulp evaporating furnace. The vanadium slag discharging system comprises a vanadium slag pulping tank, a vanadium-containing slurry collecting tank and a leaching device. The vanadium slag slurrying tank is connected to a slag discharging opening of the ore pulp evaporation furnace through a closed pipeline, the vanadium slag slurrying tank is of a closed structure, a first stirring device is arranged in the vanadium slag slurrying tank, and alkali liquor is contained in the vanadium slag slurrying tank. The vanadium-containing slurry collecting tank is connected to the vanadium slag slurrying tank through a pipeline so as to receive vanadium-containing slurry discharged by the vanadium slag slurrying tank. And the leaching device is connected with the vanadium slag pulping tank and the vanadium-containing slurry collecting tank through pipelines so as to collect flue gas discharged from the vanadium slag pulping tank and the vanadium-containing slurry collecting tank and carry out leaching treatment on the flue gas. The system can be used for treating the ore pulp deslagging flue gas, and meanwhile, the vanadium loss during the deslagging period is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of titanium dioxide chloride, in particular to a vanadium slag discharge system for a slurry evaporation furnace. Background Art

[0002] Crude titanium tetrachloride is the main raw material for the production of titanium sponge and titanium dioxide. The quality of crude titanium tetrachloride in titanium sponge production is directly related to the grade of the final product. In the production process of crude titanium tetrachloride, a large amount of high-boiling point chlorides and solid particle impurities carried by the airflow contained in the flue gas at the outlet of the boiling chlorination furnace are condensed by dust collection, and most of them are separated from titanium tetrachloride. However, a small amount of dust impurities are eluted by the condensed titanium tetrachloride when passing through the leaching equipment and enter the liquid crude titanium tetrachloride. After solid-liquid separation in the sedimentation tank, impurities such as high-boiling point chlorides and solid particles suspended in titanium tetrachloride are gradually deposited at the bottom of the sedimentation tank in a muddy state. In addition to high-boiling point chlorides, the sedimentation mud also contains a large amount of TiCl4, which has a high recovery value.

[0003] The slurry evaporation method is usually used to treat the sedimentation slurry. Patent CN219023246U discloses an evaporation treatment device for titanium tetrachloride slurry. The device heats the slurry by external heat, so that the titanium tetrachloride therein evaporates and vaporizes, and then condenses and recovers the gaseous titanium tetrachloride, and discharges the vanadium slag from the dry slag outlet. The slag discharge of the slurry evaporation device is directly discharged into the slag bucket from the bottom outlet of the device. Smoke will be generated during the slag discharge process, polluting the environment. In order to facilitate transportation, water is generally used to flush the vanadium slag in the slag bucket for cooling and infiltration. This process will result in a large amount of vanadium loss.

[0004] Therefore, there is still much room for improvement in the current slurry evaporation furnace slag discharge. Utility Model Content

[0005] The main purpose of the utility model is to provide a vanadium slag discharge system for a slurry evaporation furnace, so as to treat the slurry slag discharge fume and reduce the vanadium loss during the slag discharge.

[0006] According to one aspect of the utility model, a vanadium slag discharge system for a slurry evaporation furnace is provided, the system comprising:

[0007] A vanadium slag slurry tank, which is connected to the slag discharge port of the slurry evaporation furnace via a closed pipeline, the vanadium slag slurry tank is a closed structure and a first stirring device is provided in the tank, and the vanadium slag slurry tank contains alkali solution;

[0008] A vanadium-containing slurry collecting tank, wherein the vanadium-containing slurry collecting tank is connected to the vanadium slag slurry making tank via a pipeline to receive the vanadium-containing slurry discharged from the vanadium slag slurry making tank;

[0009] A leaching device is connected to the vanadium slag slurry tank and the vanadium-containing slurry collecting tank via a pipeline to collect the flue gas discharged from the vanadium slag slurry tank and the vanadium-containing slurry collecting tank and perform leaching treatment on the flue gas.

[0010] According to an embodiment of the present invention, the system further comprises an alkali solution storage tank, and the alkali solution storage tank is connected to the vanadium slag slurrying tank via a pipeline.

[0011] According to an embodiment of the present invention, the system further comprises a water storage tank, and the water storage tank is connected to the vanadium slag slurrying tank via a pipeline.

[0012] According to an embodiment of the utility model, the system further comprises a nitrogen supply device, which is connected to the closed pipeline between the vanadium slag slurrying tank and the slag discharge port of the slurry evaporation furnace via a pipeline.

[0013] According to one embodiment of the utility model, a shut-off valve is further provided in the closed pipeline, and the shut-off valve is arranged downstream in the discharge direction of the connection between the nitrogen supply device and the closed pipeline. When the shut-off valve is in a closed state, the communication between the vanadium slag slurrying tank and the slag discharge port of the slurry evaporation furnace is blocked.

[0014] According to an embodiment of the utility model, breathing tubes are provided on the tops of the vanadium slag slurry making tank and the vanadium-containing slurry collecting tank.

[0015] According to an embodiment of the utility model, a second stirring device is further provided in the vanadium-containing slurry collecting tank.

[0016] According to an embodiment of the utility model, a pump is further provided on the pipeline between the vanadium slag slurry making tank and the vanadium-containing slurry collecting tank.

[0017] According to an embodiment of the utility model, a discharge pipe is further provided at the bottom of the vanadium-containing slurry collecting tank, and a pump is provided on the discharge pipe.

[0018] According to an embodiment of the utility model, the elution device is a elution tower, and the elution tower is connected to the top of the vanadium slag slurry making tank and the vanadium-containing slurry collecting tank via pipelines.

[0019] Due to the adoption of the above technical scheme, the vanadium slag discharge system for the slurry evaporation furnace according to the utility model uses alkali liquid to fix vanadium in the vanadium slag in the tank, and the material and the alkali liquid are fully mixed by stirring to enhance the vanadium fixing effect. The whole system is a fully enclosed structure. The flue gas generated during the pulping process is treated by a leaching tower to avoid the external discharge of flue gas to pollute the environment. There is no scattered flue gas during the slag discharge process. The system controls the flue gas of the slurry slag discharge while reducing the loss of vanadium during the slag discharge. In some embodiments, the system is also provided with a nitrogen supply device. When the slag discharge port of the slurry evaporation furnace is hardened and the slag discharge is blocked, the slag material can be crushed with high-pressure nitrogen to enable smooth slag discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0021] Figure 1 The overall structural schematic diagram of a vanadium slag discharge system for a slurry evaporation furnace according to an embodiment of the utility model is shown;

[0022] Figure 2 A schematic diagram is shown of a vanadium slag discharge system for a slurry evaporation furnace according to an embodiment of the utility model when used in conjunction with a slurry evaporation furnace.

[0023] Description of Reference Numerals

[0024] 10. Vanadium slag slurry tank; 12. Closed pipeline; 14. First stirring device; 20. Vanadium-containing slurry collection tank; 22. Second stirring device; 30. Leaching device; 40. Alkali solution storage tank; 50. Water storage tank; 60. Nitrogen supply device; V0. Shut-off valve; V1. Control valve; V2. Pressure reducing valve; P1. Pump; P2. Pump; L. Slurry evaporation furnace. DETAILED DESCRIPTION

[0025] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0026] Unless otherwise defined, all technical and scientific terms used in this document have the same meaning as commonly understood by technicians in the technical field of the present invention; the terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For example, the directions or positions indicated by terms such as "length", "width", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are based on the directions or positions shown in the drawings, which are only for the convenience of description and cannot be understood as limitations on the present technical solution.

[0027] The terms "including" and "having" and any variations thereof in the specification and claims of the present utility model and the above-mentioned drawings are intended to cover non-exclusive inclusions; the terms "first", "second", etc. in the specification and claims of the present utility model or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0028] In the specification and claims of the utility model and the above-mentioned drawings, when an element is referred to as being "fixed on" or "mounted on" or "disposed on" or "connected to" another element, it may be directly or indirectly located on the other element. For example, when an element is referred to as being "connected to" another element, it may be directly or indirectly connected to the other element.

[0029] In addition, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] One object of the utility model is to provide a vanadium slag slag discharge system for a slurry evaporation furnace, which generally includes a vanadium slag slurry tank, a vanadium-containing slurry collection tank and a leaching device. Among them, the vanadium slag slurry tank is connected to the slag discharge port of the slurry evaporation furnace via a closed pipeline, the vanadium slag slurry tank is a closed structure and a first stirring device is provided in the tank, and the vanadium slag slurry tank contains alkali solution. The vanadium-containing slurry collection tank is connected to the vanadium slag slurry tank via a pipeline to receive the vanadium-containing slurry discharged from the vanadium slag slurry tank. The leaching device is connected to the vanadium slag slurry tank and the vanadium-containing slurry collection tank via a pipeline to collect the flue gas discharged from the vanadium slag slurry tank and the vanadium-containing slurry collection tank and perform leaching treatment on the flue gas.

[0031] According to the vanadium slag discharge system for a slurry evaporation furnace of the utility model, alkali liquid is prepared in advance in the vanadium slag slurrying tank, and when the slurry evaporation furnace discharges the vanadium slag, the alkali liquid is used to react with the vanadium-containing substances (such as VCl3, VCl4, VOCl, VOCl2, VOCl3) in the vanadium slag to achieve vanadium fixation in the vanadium slag in the tank, and the material and the alkali liquid are fully mixed by stirring to enhance the vanadium fixation effect. The whole system is a fully enclosed structure, and the flue gas generated during the slurrying process is processed by a leaching tower to avoid the exhaust of flue gas to pollute the environment, and there is no scattered flue gas during the slag discharge process. The system controls the slurry slag discharge flue gas while reducing the loss of vanadium during the slag discharge.

[0032] Figure 1 The overall structure schematic diagram of a vanadium slag discharge system for a slurry evaporation furnace according to a specific embodiment of the utility model is shown. Figure 1 As shown, the vanadium slag discharge system for a slurry evaporation furnace generally includes a vanadium slag slurry making tank 10, a vanadium-containing slurry collecting tank 20 and a leaching device 30.

[0033] The vanadium slag slurry tank 10 is used to receive the vanadium slag discharged from the bottom of the slurry evaporation furnace, so the vanadium slag slurry tank 10 is connected to the slag discharge port of the slurry evaporation furnace via a closed pipe 12. The vanadium slag slurry tank 10 itself is also a closed structure, for example, the vanadium slag slurry tank 10 can be a closed box-shaped structure, the box body is provided with a vanadium slag inlet on the top wall, the vanadium slag inlet is connected to the lower end of the closed pipe 12, the upper end of the closed pipe 12 is connected to the slag discharge port of the slurry evaporation furnace, and the size of the closed pipe 12 is designed according to the size of the slag discharge port or the slag discharge amount of each slag discharge. The vanadium slag slurry tank 10 contains alkali solution, which can be sodium peroxide, sodium hydroxide, sodium carbonate, sodium bicarbonate, etc. On the one hand, the alkali solution can react with the low melting and boiling point vanadium-containing substances (such as VCl3, VCl4, VOCl, VOCl2, VOCl3) in the vanadium slag to generate vanadium salts with higher melting and boiling points to prevent them from volatilizing during the discharge process, thereby retaining the vanadium in the slurry more stably. On the other hand, the alkali solution can also wet and cool the vanadium slag to facilitate subsequent transportation. In order to make the vanadium slag react fully with the alkali solution, a first stirring device 14 can be provided in the vanadium slag slurry tank 10. The first stirring device 14 can specifically include a motor installed outside the vanadium slag slurry tank 10 above the top wall of the vanadium slag slurry tank 10, a rotating shaft connected to the output end of the motor and inserted into the vanadium slag slurry tank 10, and a blade connected to the bottom end of the rotating shaft. The motor can be used to control the rotation speed of the blade to control the stirring speed. The material and the alkali solution are fully mixed by stirring to enhance the vanadium fixation effect.

[0034] In order to facilitate continuous slag discharge and make the vanadium slag and alkali solution react more fully, the system is also provided with a vanadium-containing slurry collection tank 20. The vanadium-containing slurry collection tank 20 is also a closed box structure, and its top wall is provided with a slurry inlet, and the side wall of the vanadium slag slurry making tank 10 is provided with a slurry outlet. One end of the second pipeline is connected to the slurry outlet, and the other end is connected to the slurry inlet. When the vanadium-containing slurry in the vanadium slag slurry making tank 10 needs to be discharged, it is discharged into the vanadium-containing slurry collection tank 20 through the second pipeline. Optionally, in some embodiments, a second stirring device 22 is provided in the vanadium-containing slurry collection tank 20, and the structure of the second stirring device 22 is similar to that of the first stirring device 14. The material and the alkali solution are fully mixed by stirring to enhance the vanadium fixing effect. A discharge port can also be provided at the bottom of the side wall of the vanadium-containing slurry collection tank 20, and the discharge port is connected to a discharge pipe, and the discharged slurry can be transferred to the subsequent vanadium extraction equipment.

[0035] The top walls of the vanadium slag pulping tank 10 and the vanadium-containing slurry collecting tank 20 are both provided with exhaust ports, and the third pipe connects the exhaust ports to the leaching device 30. When the vanadium slag in the vanadium slag pulping tank 10 and the vanadium-containing slurry collecting tank 20 reacts with the alkali solution, some flue gas may be generated, and the flue gas enters the leaching device 30 through the third pipe. The leaching device 30 can use some commonly used leaching towers in the field, and the specific structure can refer to the leaching tower disclosed in patent CN207478292U. The flue gas generated during the pulping process is treated by the leaching tower, which avoids the exhaust of flue gas to pollute the environment and ensures that there is no scattered flue gas during the slag discharge process. The system controls the slurry slag discharge flue gas while reducing the loss of vanadium during the slag discharge.

[0036] Optionally, in some embodiments, the vanadium slag deslagging system for the slurry evaporation furnace further includes an alkali liquid storage tank 40, in which the alkali liquid to be supplied to the vanadium slag slurry tank 10 is contained, so that the alkali liquid in the vanadium slag slurry tank 10 can be replenished in time after being consumed. To this end, the alkali liquid storage tank 40 is connected to the vanadium slag slurry tank 10 via a pipeline, and a control valve is also provided on the pipeline connecting the two to control the on-off of the pipeline to prevent the slurry from flowing back into the alkali liquid storage tank 40.

[0037] Optionally, in some embodiments, the vanadium slag deslagging system for the slurry evaporation furnace further includes a water storage tank 50. When the slurry is too viscous to be transported, the water in the water storage tank 50 can be supplied to the vanadium slag slurry tank 10 to dilute the slurry and improve its fluidity. To this end, the water storage tank 50 is connected to the vanadium slag slurry tank 10 via a pipeline, and a control valve is also provided on the pipeline connecting the two to control the on-off of the pipeline to prevent the slurry from flowing back into the water storage tank 50.

[0038] Optionally, in some embodiments, the vanadium slag discharge system for the slurry evaporation furnace may further include a nitrogen supply device 60, which has the following two functions: (1) providing high-pressure nitrogen to impact the vanadium slag that is hardened at the slurry evaporation furnace discharge port; (2) providing low-pressure nitrogen to prompt the vanadium slag and gas in the closed pipe 12 to enter the vanadium slag slurry tank 10. The nitrogen supply device 60 is connected to the closed pipe 12 via a pipeline. Specifically, the connection point between the nitrogen supply device 60 and the closed pipe 12 (hereinafter referred to as the first connection point) may be located near the slurry discharge port of the slurry evaporation furnace. In terms of the discharge direction, the first connection point is located upstream of the connection point between the alkali solution storage tank 40 and the water storage tank 50 and the closed pipe 12 (hereinafter referred to as the second connection point). The nitrogen supply device 60 may use a high-pressure nitrogen tank that stores nitrogen at a pressure of 0.5 MPa. A shut-off valve V0 may also be provided in the closed pipe 12, and the shut-off valve V0 may be located between the first connection point and the second connection point. Figure 1 As shown, the nitrogen supply device 60 can be connected to the closed pipeline 12 via two pipelines, a high-pressure pipeline and a low-pressure pipeline. A control valve V1 is provided on the high-pressure pipeline, which is used to control the on and off of the high-pressure pipeline. A pressure reducing valve V2 is provided on the low-pressure pipeline, which is used to control the on and off of the low-pressure pipeline and reduce the pressure in the pipeline. When the slag discharge port of the slurry evaporation furnace is hardened, the cut-off valve V0 is closed, the passage between the nitrogen supply device 60 and the vanadium slag slurry tank 10 is cut off, the control valve V1 is opened, the passage between the nitrogen supply device 60 and the slag discharge port is connected, the gas source is opened, and the hardened vanadium slag is impacted by high-pressure nitrogen. When the slag is discharged normally, the control valve V1 is closed, the cut-off valve V0 is opened, and the vanadium slag is discharged from the slag discharge port into the vanadium slag slurry tank 10. At the end of the slag discharge, the pressure reducing valve V2 and the gas source are opened to allow the low-pressure nitrogen to enter the closed pipeline 12, so that the vanadium slag particles and flue gas in the closed pipeline 12 enter the vanadium slag slurry tank 10.

[0039] Optionally, in some embodiments, in order to balance the pressure in the vanadium slag slurrying tank 10 and the vanadium-containing slurry collecting tank 20, a breathing tube (not shown) is provided on the top of the vanadium slag slurrying tank 10 and the vanadium-containing slurry collecting tank 20, and a breathing port can be opened on the top wall of the vanadium slag slurrying tank 10 and the vanadium-containing slurry collecting tank 20, and the breathing tube is inserted into the vanadium slag slurrying tank 10 and the vanadium-containing slurry collecting tank 20 through the breathing port.

[0040] Optionally, in some embodiments, a pump P1 and a control valve are further provided on the pipeline between the vanadium slag slurrying tank 10 and the vanadium-containing slurry collecting tank 20 so that the pump P1 can be opened when needed to smoothly discharge the slurry in the vanadium slag slurrying tank 10 into the vanadium-containing slurry collecting tank 20.

[0041] Optionally, in some embodiments, a pump P2 is provided on the discharge pipeline to discharge the slurry in the vanadium-containing slurry collection tank 20 to a transport vehicle or a subsequent vanadium extraction device.

[0042] Figure 2 The schematic diagram of the vanadium slag discharge system for a slurry evaporation furnace according to an embodiment of the utility model when used in conjunction with the slurry evaporation furnace is shown. As shown in the figure, the upper end of the closed pipe 12 is connected to the discharge port of the slurry evaporation furnace L. The slurry evaporation furnace L can be used for the organic vanadium removal slurry treatment process in the titanium dioxide chloride industry or the titanium sponge industry. After the slurry in the slurry evaporation furnace L is evaporated to dryness, the bottom slag discharge valve is opened, and the rotation direction of the agitator in the slurry evaporation furnace L is reversed. The slag falls into the vanadium slag slurry tank 10 prepared with alkali solution in advance under the action of gravity and the thrust of the agitator. The nitrogen supply device 60 is used in conjunction to allow the vanadium slag and flue gas to enter the vanadium slag slurry tank 10 more completely, and the material and alkali solution are fully mixed by stirring, and the alkali solution is used to fix vanadium in the vanadium slag in the tank. A breathing tube is provided at the top of the vanadium slag slurry tank 10 to balance the pressure in the tank, and the slurry is pumped out by a circulating pump P1. When continuous production is required, the vanadium slag is briefly slurried in the vanadium slag slurry tank 10 and then pumped to the vanadium-containing slurry collection tank 20, where it continues to stir and react. The entire slurrying system is a fully enclosed structure, and the flue gas generated during the slurrying process is treated by the leaching device 30, and no flue gas is emitted during the slag discharge process.

[0043] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0044] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0045] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A vanadium slag discharge system for a slurry evaporation furnace, characterized in that: include: A vanadium slag slurry tank, which is connected to the slag discharge port of the slurry evaporation furnace via a closed pipeline, the vanadium slag slurry tank is a closed structure and a first stirring device is provided in the tank, and the vanadium slag slurry tank contains alkali solution; A vanadium-containing slurry collecting tank, wherein the vanadium-containing slurry collecting tank is connected to the vanadium slag slurry making tank via a pipeline to receive the vanadium-containing slurry discharged from the vanadium slag slurry making tank; A leaching device is connected to the vanadium slag slurry tank and the vanadium-containing slurry collecting tank via a pipeline to collect the flue gas discharged from the vanadium slag slurry tank and the vanadium-containing slurry collecting tank and perform leaching treatment on the flue gas.

2. The vanadium slag discharge system for a slurry evaporation furnace according to claim 1, characterized in that: The system further comprises an alkali solution storage tank, which is connected to the vanadium slag slurrying tank via a pipeline.

3. The vanadium slag discharge system for a slurry evaporation furnace according to claim 2, characterized in that: The system further comprises a water storage tank connected to the vanadium slag slurrying tank via a pipeline.

4. The vanadium slag discharge system for a slurry evaporation furnace according to claim 1, characterized in that: The system further comprises a nitrogen supply device, which is connected to the closed pipeline between the vanadium slag slurrying tank and the slag discharge port of the slurry evaporation furnace via a pipeline.

5. The vanadium slag discharge system for a slurry evaporation furnace according to claim 4, characterized in that: A shut-off valve is also provided in the closed pipeline. The shut-off valve is arranged downstream of the discharge direction of the connection between the nitrogen supply device and the closed pipeline. When the shut-off valve is in a closed state, it blocks the communication between the vanadium slag slurrying tank and the slag discharge port of the slurry evaporation furnace.

6. The vanadium slag discharge system for a slurry evaporation furnace according to claim 1, characterized in that: The tops of the vanadium slag slurry making tank and the vanadium-containing slurry collecting tank are both provided with breathing tubes.

7. The vanadium slag discharge system for a slurry evaporation furnace according to claim 1, characterized in that: A second stirring device is also provided in the vanadium-containing slurry collecting tank.

8. The vanadium slag discharge system for a slurry evaporation furnace according to claim 1, characterized in that: A pump is also provided on the pipeline between the vanadium slag slurry making tank and the vanadium-containing slurry collecting tank.

9. The vanadium slag discharge system for a slurry evaporation furnace according to claim 8, characterized in that: A discharge pipe is also provided at the bottom of the vanadium-containing slurry collecting tank, and a pump is provided on the discharge pipe.

10. The vanadium slag discharge system for a slurry evaporation furnace according to claim 1, characterized in that: The leaching device is a leaching tower, which is connected to the top of the vanadium slag slurry making tank and the vanadium-containing slurry collecting tank via pipelines.

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