Molten Salt Chlorination Furnace Dust Collection and Slag Pulping System

Abstract

This utility model relates to the field of titanium tetrachloride production technology, specifically to a slurry system for molten salt chlorination furnace dust collection slag. The slurry system includes a slurry tank, a circulating pump, and a slurry conveying pump. The slurry tank is connected to the slag discharge outlet of the solid dust collection chamber via a dust collection slag conveying pipeline. The inlet of the circulating pump is connected to the slurry tank, and the outlet of the circulating pump is connected to the dust collection slag conveying pipeline via a first circulating pipeline and to the upper part of the slurry tank via a second circulating pipeline. The inlet of the slurry conveying pump is connected to the bottom of the slurry tank and is used to send the slurry to subsequent processing steps. This application proposes a slurry system for molten salt chlorination furnace dust collection slag, which, using relevant process equipment, can realize the slurry treatment of molten salt chlorination furnace dust collection slag, effectively solving the environmental pollution problem caused by gas generated during collection and transportation, and also providing conditions for further separation and recovery of usable components from the molten salt chlorination furnace dust collection slag.

Description

Technical Field

[0001] This utility model relates to the field of titanium tetrachloride production technology, specifically to a molten salt chlorination furnace dust collection and slag pulping system. Background Technology

[0002] In the process of producing titanium tetrachloride using the molten salt chlorination method, the molten salt chlorination furnace generates a large amount of dust slag, the main components of which are unreacted metal chlorides, oxides, and residual carbon. Currently, the industry commonly uses the traditional method of mixing with lime for treatment. This method has the following significant drawbacks: Resource waste: The extensive mixing treatment cannot effectively separate and recover valuable components (such as titanium, iron, and other metal chlorides) from the dust slag, resulting in low resource utilization. Process defects: Existing technologies lack closed-loop, continuous treatment systems, leading to frequent problems such as flue gas backflow and pipeline blockage, affecting production stability. For example, although patent CN101423248A proposes a pulping treatment scheme, it relies on a complex airlock unloading mechanism, resulting in high equipment costs and difficult maintenance. Environmental pollution: During the collection, transportation, and treatment of the dust slag, a large amount of harmful gases such as hydrogen chloride are released, causing serious air pollution, deteriorating the working environment, and failing to meet increasingly stringent environmental regulations.

[0003] Therefore, there is an urgent need to develop a highly efficient and environmentally friendly dust and slag treatment system for molten salt chlorination furnaces, capable of achieving synergistic optimization of closed-loop pulping, resource recovery, and pollution control. This patent application aims to address the aforementioned technical bottlenecks. Utility Model Content

[0004] In view of this, this application proposes a slurry system for dust collection residue from molten salt chlorination furnaces. By using relevant process equipment, the dust collection residue from molten salt chlorination furnaces can be slurried, which not only effectively solves the problem of gas pollution caused by collection and transportation, but also provides conditions for further separation and recovery of usable components in the dust collection residue from molten salt chlorination furnaces.

[0005] This invention discloses a slurry system for dust collection and slag beating in a molten salt chlorination furnace, comprising a slurry beating tank, a circulating pump, and a slurry conveying pump. The slurry beating tank is connected to the slag discharge outlet of the solid dust collection chamber via a dust collection and slag conveying pipeline. The inlet of the circulating pump is connected to the slurry beating tank, and the outlet of the circulating pump is connected to the dust collection and slag conveying pipeline via a first circulating pipeline and to the upper part of the slurry beating tank via a second circulating pipeline. The inlet of the slurry conveying pump is connected to the bottom of the slurry beating tank and is used to deliver the slurry to subsequent processing steps.

[0006] In some embodiments, the molten salt chlorination furnace dust collection and slag pulping system further includes a flue gas treatment system, which is connected to the pulping tank via a flue gas duct.

[0007] In some embodiments, a first valve and a second valve are provided on the dust collection and slag conveying pipeline, and a sealable pipeline section is formed between the first valve and the second valve. A gas sealing device for filling the pipeline section with gas is also connected to the pipeline section, and the outlet of the first circulation pipeline is connected to the pipeline section.

[0008] In some embodiments, the gas sealing device includes a gas source and a pressure regulating valve for maintaining the pressure within the pipeline section higher than the pressure in the pulping tank and the solid dust collection chamber.

[0009] In some embodiments, the gas source is nitrogen or argon.

[0010] In some embodiments, a water inlet is provided on the upper side of the pulping tank, and an agitator is provided inside, with the agitator rotating at a speed of 50~200 rpm.

[0011] In some embodiments, the first valve and the second valve are pneumatic butterfly valves with a response time of ≤1 second.

[0012] In some embodiments, a filter screen with a particle size ≥0.5mm is provided between the circulating pump and the pulping tank.

[0013] In some embodiments, the bottom of the slurry tank is configured as a conical structure with a cone angle of 45° to 60°, and the slurry delivery pump is connected to the bottom of the conical structure.

[0014] In some embodiments, a gas cooler for cooling is provided on the exhaust duct.

[0015] The beneficial effects of this application are as follows: The molten salt chlorination furnace dust collection slag pulping system proposed in this application achieves efficient treatment and resource utilization of the dust collection slag through the synergistic action of the pulping tank, circulating pump, and slurry conveying pump. The system transports the dust collection slag to the pulping tank for thorough pulping. The circulating pump not only returns the slurry to the pulping tank for continuous stirring but also flushes the conveying pipeline to prevent blockage. The slurry conveying pump then transports the treated slurry to subsequent processes. This design effectively solves the problem of hydrogen chloride gas leakage caused by dust collection slag exposure in traditional treatment methods, significantly improving the working environment. Simultaneously, the closed-loop circulation treatment improves the resource recovery rate, providing a reliable technical solution for the environmentally friendly treatment of molten salt chlorination furnace dust collection slag. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0017] Figure 1A flowchart of a molten salt chlorination furnace dust collection and slag pulping system provided in one embodiment of this utility model.

[0018] Explanation of reference numerals in the attached figures: 1. Slurry tank; 2. Circulation pump; 3. Slurry conveying pump; 4. Dust collection and slag conveying pipeline; 5. First circulation pipeline; 6. Second circulation pipeline; 7. First valve; 8. Second valve. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to specific examples and accompanying drawings.

[0020] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0021] refer to Figure 1 This utility model proposes a slurry system for molten salt chlorination furnace dust collection slag, comprising a slurry tank 1, a circulating pump 2, and a slurry conveying pump 3. The slurry tank 1 is connected to the slag discharge outlet of the solid dust collection chamber via a dust collection slag conveying pipe 4, for conveying the dust collection slag into the slurry tank 1 for slurrying. The inlet of the circulating pump 2 is connected to the slurry tank 1, and the outlet of the circulating pump 2 is connected to the dust collection slag conveying pipe 4 via a first circulating pipe 5, and to the upper part of the slurry tank 1 via a second circulating pipe 6. The inlet of the slurry conveying pump 3 is connected to the bottom of the slurry tank 1, for sending the slurry to subsequent processing steps.

[0022] The molten salt chlorination furnace dust collection slag pulping system proposed in this invention achieves efficient treatment and resource utilization of dust collection slag through the synergistic action of a pulping tank 1, a circulating pump 2, and a slurry conveying pump 3. The system transports the dust collection slag to the pulping tank 1 for thorough pulping. The circulating pump 2 both returns the slurry to the pulping tank 1 for continuous stirring and flushes the dust collection slag conveying pipeline 4 to prevent blockage. The slurry conveying pump 3 then transports the treated slurry to subsequent processes. This design effectively solves the problem of hydrogen chloride gas leakage caused by the exposure of dust collection slag in traditional treatment methods, significantly improving the working environment. Simultaneously, the closed-loop circulation treatment improves the resource recovery rate, providing a reliable technical solution for the environmentally friendly treatment of molten salt chlorination furnace dust collection slag.

[0023] In some embodiments, the molten salt chlorination furnace dust collection and pulping system also includes a flue gas treatment system. This system is connected to the pulping tank 1 via an exhaust pipe and effectively collects and treats the flue gas containing harmful gases such as hydrogen chloride generated during the pulping process. Specifically, the flue gas treatment system uses negative pressure suction to guide the flue gas into the treatment device. After purification, the gas is discharged in compliance with standards, preventing the leakage of harmful gases and environmental pollution, improving the air quality of the work area, and recovering usable components from the flue gas. This achieves the dual benefits of environmental protection and resource utilization, significantly improving the environmental friendliness and safety of the entire pulping system.

[0024] In some embodiments, the dust collection and slag conveying pipeline 4 is further equipped with a first valve 7 and a second valve 8. The first valve 7 is near the solid dust collection chamber, and the second valve 8 is near the pulping tank 1. A sealable pipeline section is formed between the first valve 7 and the second valve 8. A gas sealing device for introducing gas into the pipeline section is also connected to the pipeline section, and the outlet of the first circulation pipeline 5 is connected to the pipeline section. In use, during the dust collection and slag conveying stage (normal feeding), both the first valve 7 and the second valve 8 are open, the gas sealing device stops introducing gas or maintains low pressure, and the dust collection and slag fall freely into the pulping tank 1 through the pipeline. At this time, no gas sealing is required. During the pulping anti-backflow stage (blocking flue gas), both the first valve 7 and the second valve 8 are closed, and the gas sealing device introduces high-pressure inert gas (such as nitrogen) into the pipeline section to establish a pressure barrier and prevent harmful flue gas such as HCl generated during pulping from back-permeating into the dust collection chamber. During the pipeline flushing phase (to prevent mud backflow), the first valve 7 is closed, and the second valve 8 is open (or its opening is adjusted). The gas sealing device continuously pressurizes to maintain positive pressure, and the circulating pump 2 injects mud into the inter-valve pipeline section through the first circulating pipeline 5 for flushing. The gas pressure ensures that the mud flows only to the slurry tank 1, preventing backflow and contamination of the solid dust collection chamber. Furthermore, during system standby or maintenance phases, both the first valve 7 and the second valve 8 are closed, and the gas sealing device maintains low pressure or remains closed to completely isolate the solid dust collection chamber from the slurry tank 1, ensuring maintenance safety.

[0025] The above configuration achieves three functions: 1) The gas seal forms a pressure barrier, effectively preventing the reverse permeation of flue gas from the pulping tank 1 into the dust collection chamber; 2) The flushing slurry output from the circulating pump 2 can directly clean the pipeline section between valves, preventing slag deposition and blockage; 3) The gas filling also acts as an airlock, ensuring that the slurry will not flow back and contaminate the dust collection chamber during the flushing process. This innovative structure significantly improves the system's sealing performance, anti-clogging properties, and operational safety, while also optimizing pipeline maintenance efficiency.

[0026] In some embodiments, the gas sealing device includes a gas source and a pressure regulating valve to maintain a pressure within the pipeline section higher than that of the pulping tank 1 and the solid dust collection chamber. This pressure difference design forms a reliable gas barrier, effectively preventing the backflow of hydrogen chloride-containing fumes generated in the pulping tank 1 into the solid dust collection chamber, thus avoiding contamination of raw materials and equipment. Furthermore, it prevents slurry from seeping back into the solid dust collection chamber during pipeline flushing, ensuring unidirectional material flow. This pressure control system significantly improves process sealing, ensuring a safe operating environment, enhancing system stability and reliability, and reducing the risk of environmental pollution from harmful gas leaks.

[0027] In some embodiments, the gas source is nitrogen or argon, preferably nitrogen. Nitrogen, with its chemical inertness, non-flammability, and low cost, effectively isolates oxygen and moisture, preventing oxidation or hydrolysis of the collected dust. Argon, as a more stable inert gas, is suitable for demanding operating conditions with higher sealing requirements. Both gases reliably form a pressure barrier, ensuring system sealing performance while preventing reactions with corrosive substances.

[0028] In some embodiments, a water inlet is provided on the upper side of the pulping tank 1, through which the amount of water added can be precisely controlled to form a slurry of suitable concentration from the collected dust. The pulping tank 1 is equipped with an agitator with a stirring speed of 50~200 rpm, so as to fully break down the slag, promote solid-liquid mixing, and avoid increased energy consumption or equipment wear caused by excessive speed.

[0029] In some embodiments, the first valve 7 and the second valve 8 are pneumatic butterfly valves with a response time of ≤1 second, achieving dynamic sealing control of the system through their rapid opening and closing characteristics. Specifically, during the dust collection and slag conveying stage, the two valves open synchronously and quickly to ensure smooth material flow; during the anti-backflow stage, they close instantly to form physical isolation; and during the flushing stage, the opening degree can be precisely adjusted to control the slurry flow rate. This significantly improves the switching efficiency of the valves between different operating modes, effectively blocking the risks of flue gas backflow and slurry backflow, while avoiding process fluctuations caused by the action delay of traditional valves. This allows the entire pulping system to maintain high sealing performance while also possessing excellent operational flexibility and stability.

[0030] In some embodiments, a filter screen with a particle size ≥0.5mm is provided between the circulating pump 2 and the pulping tank 1. This screen can effectively remove coarse particles and impurities that have not been fully pulped, preventing them from entering the circulating pump 2 and causing equipment wear or pipe blockage. At the same time, it allows pulp of the required fineness to pass through to maintain the smooth operation of the circulation system.

[0031] In some embodiments, the bottom of the slurry tank 1 is configured as a conical structure with a cone angle of 45° to 60°. The mud conveying pump 3 is connected to the bottom of the conical structure. The slurry tank 1 with this structure can use gravity to allow the mud to naturally converge to the bottom outlet, avoiding the material deposition problem of traditional flat-bottomed tanks.

[0032] In some embodiments, a gas cooler is installed on the flue gas duct for cooling. Through active cooling, the high-temperature flue gas is cooled to a safe temperature range (typically below 60°C) before entering subsequent treatment equipment. This protects sensitive components of the flue gas treatment system (such as filter media and catalysts) from thermal damage, extends equipment life, and improves the treatment efficiency of subsequent purification processes (such as acid gas absorption).

[0033] The working principle and method of the molten salt chlorination furnace dust collection and slag pulping system of this application are as follows: The collected dust and sludge enter the pulping tank 1 through a dust and sludge conveying pipe 4 equipped with two valves (first valve 7 and second valve 8). During the conveying stage, both valves are open; during pulping, both valves are closed, and nitrogen gas is injected into the pipe section between the valves to form a pressure barrier to prevent flue gas backflow. Simultaneously, efficient pulping is carried out inside the pulping tank 1 by an agitator (50~200rpm). The circulating pump 2 uses part of the sludge for flushing the pipes and for backflow mixing, while the other part is transported by a sludge pump to subsequent processing stages via a bottom conical structure (45°~60°). The generated flue gas is cooled by a gas cooler and then enters the flue gas treatment system for purification. The entire process achieves closed-loop and automated treatment of the collected dust and sludge, effectively solving pollution problems and improving resource recovery rates.

[0034] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A dusting residue beating system of a fused salt chlorination furnace, characterized by, include: The pulping tank (1) is connected to the slag discharge outlet of the solid dust collection chamber via a dust collection slag conveying pipe (4); The circulation pump (2) is connected to the pulping tank (1) at its inlet and to the dust collection and slag conveying pipeline (4) via the first circulation pipeline (5) and to the upper part of the pulping tank (1) via the second circulation pipeline (6). A mud pump (3) is provided, the inlet of which is connected to the bottom of the slurry tank (1) and is used to send the slurry after slurrying to the subsequent processing steps.

2. The fused salt chlorinization furnace dust collection and sludging system according to claim 1, characterized in that, It also includes a flue gas treatment system, which is connected to the pulping tank (1) via a flue gas exhaust pipe.

3. The fused salt chlorinators dusting slag pulping system of claim 1, wherein, The dust collection and slag conveying pipeline (4) is equipped with a first valve (7) and a second valve (8), and a sealable pipeline section is formed between the first valve (7) and the second valve (8). The pipeline section is also connected to a gas sealing device for filling the pipeline section with gas, and the outlet of the first circulation pipeline (5) is connected to the pipeline section.

4. The fused salt chlorinization furnace dust collection and sludging system according to claim 3, characterized in that, The gas sealing device includes a gas source and a pressure regulating valve, used to maintain the pressure in the pipeline section higher than the pressure of the pulping tank (1) and the solid dust collection chamber.

5. The fused salt chlorinators dusting slag pulping system of claim 4, wherein, The gas source is nitrogen or argon.

6. The fused salt chlorinators dusting slag pulping system of claim 1, wherein, The upper side of the pulping tank (1) is provided with a water inlet, and an agitator is provided inside. The agitator has a stirring speed of 50~200 rpm.

7. The fused salt chlorinators dusting slag pulping system of claim 3, wherein, The first valve (7) and the second valve (8) are pneumatic butterfly valves with a response time of ≤1 second.

8. The fused salt chlorinators dusting slag pulping system of claim 1, wherein, A filter screen with a particle size ≥0.5mm is provided between the circulating pump (2) and the pulping tank (1).

9. The fused salt chlorinators dusting slag pulping system of claim 1 wherein, The bottom of the slurry tank (1) is set as a conical structure with a cone angle of 45°~60°, and the mud conveying pump (3) is connected to the bottom of the conical structure.

10. The fused salt chlorinators dusting slag pulping system of claim 2, wherein, The exhaust duct is equipped with a gas cooler for cooling.

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