Bottom deslagging method for ore pulp evaporating furnace

Abstract

The invention discloses a slag discharging method at the bottom of an ore pulp evaporating furnace, which comprises the following steps: in the process of evaporating titanium tetrachloride ore pulp by the ore pulp evaporating furnace, when the ore pulp evaporating furnace finishes feeding and then evaporates, keeping a slag discharging electromagnetic valve at the bottom of the ore pulp evaporating furnace electrified, and cooling and maintaining the pressure of the slag discharging electromagnetic valve. The action precision of the deslagging electromagnetic valve can be effectively improved when materials of the ore pulp evaporation furnace are overheated, it is ensured that the valve element of the deslagging electromagnetic valve moves flexibly in the deslagging process, and clamping stagnation or sealing performance reduction of the deslagging electromagnetic valve caused by thermal expansion of the materials of the ore pulp evaporation furnace is avoided; therefore, the reliability of deslagging work of the ore pulp evaporation furnace is ensured; and the deslagging electromagnetic valve is kept at a certain pressure in a closed state by performing online pressure maintaining on the deslagging electromagnetic valve, so that ore pulp is prevented from flowing back or impurities are prevented from entering a valve body in a deslagging clearance stage, and the sealing performance of the deslagging electromagnetic valve is maintained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of titanium tetrachloride production equipment, and particularly relates to a method for discharging slag from the bottom of a slurry evaporation furnace. BACKGROUND

[0002] In the process of molten salt chlorination-titanium tetrachloride refining, a slurry evaporation furnace is used to recycle and treat impurities generated in production. Due to the high temperature and high corrosion characteristics of the slurry slag, the temperature of the dried slurry slag is not lower than 400 DEG C in actual production. The residual C impurities contained in the slurry slag can burn when in contact with air, and problems such as titanium tetrachloride hydrolysis in air can occur. The slag discharge electromagnetic valve and the slag discharge channel at the bottom of the slurry evaporation furnace are frequently blocked, which seriously affects the continuous and stable operation of the slurry evaporation furnace, and can easily lead to the failure of the refining system to continuously and efficiently produce due to residue blockage.

[0003] In order to solve the problem of slag discharge blockage of the slurry evaporation furnace, the existing technology generally adopts the method of improving the slag discharge structure at the bottom of the slurry evaporation furnace. For example, the utility model patent with the authorization announcement number CN222738489U discloses a slag discharge device for the bottom of a slurry evaporation furnace, which comprises a water injection device, a neutralizing and beating tank, a spiral conveying filter press, a filtrate tank, a filtrate conveying pump and a slag tank. One side of the water injection device is connected with the slag discharge port at the bottom of the slurry evaporation furnace through a slag discharge pipeline, and the other side of the water injection device is connected with the neutralizing and beating tank. The neutralizing and beating tank is connected with the spiral conveying filter press, and the spiral conveying filter press is connected with the filtrate tank and the slag tank. The filtrate tank is connected with the wastewater system through the filtrate conveying pump. For another example, the invention patent with the publication number CN115445224A discloses an automatic slag discharge system for a slurry evaporation furnace, and the technical scheme is as follows: a slurry evaporation furnace, a first breathing pipeline is arranged on the slurry evaporation furnace; a slag discharge pot, a slag discharge pipe is arranged between the slag discharge pot and the slurry evaporation furnace, and a second breathing pipeline is arranged on the slag discharge pot; a gas source with a predetermined pressure, a gas connection pipe is arranged between the gas source with a predetermined pressure and the slag discharge pipe, and a first switch valve is arranged on the gas connection pipe.

[0004] The technical schemes of the above-mentioned patents all increase additional slag discharge devices at the slag discharge position at the bottom of the slurry evaporation furnace to assist in slag discharge, and all need to transform the overall structure of the slurry evaporation furnace, which causes the increase of production cost, and also causes the slag discharge process to be more complicated due to the increase of the involved equipment, which is not conducive to improving the production efficiency. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a method for discharging slag from the bottom of a slurry evaporation furnace, which can effectively prevent the slag discharge part of the slurry evaporation furnace from being blocked and is convenient to implement.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a slag discharge method at the bottom of a slurry evaporator. During the evaporation of titanium tetrachloride slurry in the slurry evaporator, when the slurry evaporator is fed and evaporation is carried out, the slag discharge solenoid valve at the bottom of the slurry evaporator is kept energized, and the slag discharge solenoid valve is cooled and pressure maintained.

[0007] As an improvement to the above solution, the following steps are included:

[0008] S1. Before the titanium tetrachloride slurry is fed into the slurry evaporator, clean the slag discharge solenoid valve and slag discharge channel at the bottom of the slurry evaporator.

[0009] S2. When evaporation begins after feeding is completed, energize and maintain the slag discharge solenoid valve, and then continuously use nitrogen to cool and maintain the pressure of the slag discharge solenoid valve.

[0010] S3. After the evaporation work of the slurry evaporator is completed, disconnect the power to the slag discharge solenoid valve;

[0011] S4. After the slag discharge is completed, purge the slag discharge solenoid valve and the slag discharge channel.

[0012] As an improvement to the above solution: In step S1, compressed air is used to clean the slag discharge solenoid valve and the slag discharge channel.

[0013] As an improvement to the above scheme: In step S1, the slurry evaporator keeps the slag discharge solenoid valve fully closed before feeding.

[0014] As an improvement to the above scheme: In step S2, when nitrogen is used to cool and maintain the pressure of the slag discharge solenoid valve, the pressure range is maintained at 0.6 to 2.5 MPa.

[0015] As an improvement to the above solution: In step S2, when nitrogen is used to cool and maintain the pressure of the slag discharge solenoid valve, the nitrogen flow rate is maintained in the range of 2-3 m³ / h. 3 / h.

[0016] As an improvement to the above scheme: In step S3, after the evaporation work of the slurry evaporator is completed, the power to the slag discharge solenoid valve is turned off first, and then the cooling and pressure holding of the slag discharge battery valve are stopped.

[0017] As an improvement to the above scheme: In step S4, after the slag discharge is completed, the slag discharge solenoid valve is fully open, and the slag discharge channel is purged with nitrogen cannon for 3 to 5 minutes before the slag discharge solenoid valve is closed.

[0018] The beneficial effects of this invention are as follows: By improving the evaporation operation of the slurry evaporator, the slag discharge solenoid valve and slag discharge channel at the bottom of the slurry evaporator are cleaned before feeding. During the evaporation process, the slag discharge solenoid valve is kept energized while nitrogen is continuously used to cool and maintain pressure. This invention effectively improves the operating accuracy of the slag discharge solenoid valve when the material is overheated, ensuring that the valve core remains flexible during slag discharge and preventing jamming or reduced sealing performance due to thermal expansion of the material in the slurry evaporator, thus ensuring the reliability of the slag discharge operation. Furthermore, by maintaining online pressure on the slag discharge solenoid valve, a certain pressure is maintained when it is closed, preventing slurry backflow or impurities from entering the valve body during the slag discharge interval, thereby maintaining the sealing performance of the slag discharge solenoid valve. Detailed Implementation

[0019] To facilitate understanding of the present invention, the present invention will be further described below with reference to embodiments.

[0020] The bottom slag discharge method of the slurry evaporator disclosed in this invention improves the evaporation process of the slurry evaporator. During the evaporation of titanium tetrachloride slurry in the slurry evaporator, when the slurry evaporator is evaporating after feeding, the slag discharge solenoid valve at the bottom of the slurry evaporator is kept energized and cooled and pressure maintained.

[0021] Specifically, the bottom slag discharge method for a slurry evaporator disclosed in this invention is implemented according to the following steps:

[0022] S1. Before the titanium tetrachloride slurry is fed into the slurry evaporator, the slag discharge solenoid valve and slag discharge channel at the bottom of the slurry evaporator are cleaned. Compressed air is used for cleaning to remove particulate matter from the valve body and slag discharge channel. During this process, the slag discharge solenoid valve is kept fully closed to avoid the phenomenon of particulate matter blocking the valve.

[0023] S2. When evaporation begins after feeding is complete, energize and maintain the slag discharge solenoid valve. Then, open the manual valve of the nitrogen gas source to continuously cool and pressure the slag discharge solenoid valve with nitrogen. During this process, maintain the pressure range of 0.6–2.5 MPa and the nitrogen flow rate range of 2–3 m³ / h. 3 / h, by cooling the slag discharge solenoid valve, the sealing ring and coil of the slag discharge solenoid valve are prevented from deforming due to the heat of the material during the heating and evaporation process of the slurry evaporator. This avoids a decrease in the sealing performance of the slag discharge solenoid valve, prevents air from entering the valve body of the slag discharge solenoid valve and reacting with titanium tetrachloride to generate hydrolyzed materials that block the slag discharge channel, and prevents the slurry slag from flowing back into the valve body of the slag discharge solenoid valve during the slag discharge interval and blocking the slag discharge solenoid valve.

[0024] S3. After the evaporation work of the slurry evaporator is completed, first turn off the power to the slag discharge solenoid valve, and then close the manual valve of the nitrogen gas source to stop the cooling and pressure holding of the slag discharge battery valve.

[0025] S4. After the slag discharge is completed, turn the slag discharge solenoid valve to the fully open position, use a nitrogen cannon to purge the slag discharge channel for 3 to 5 minutes, and then close the slag discharge solenoid valve to wait for the next slag discharge cycle.

[0026] Example 1

[0027] A factory uses a slurry evaporator to process high-concentration slurry slag. Because the slurry slag contains a large amount of aluminum hydroxide particles, calcium, magnesium, and other impurities, the bottom slag discharge channel of the evaporator is frequently blocked. On average, after evaporating each batch of slurry slag, components such as the hydraulic ejector and breathing pipeline need to be cleaned, resulting in a 15% decrease in evaporation efficiency and annual maintenance costs exceeding 500,000 yuan. The verification data of the implementation effect after adopting the bottom slag discharge method for the slurry evaporator described in this invention are shown in Table 1 below:

[0028] Table 1. Verification of the implementation effect of Example 1

[0029]

[0030] The verification data from the above embodiments show that the present invention can significantly reduce the clogging frequency of bottom slag discharge in slurry evaporators and improve the stability and efficiency of system operation, thus verifying the practicality and effectiveness of the present invention.

Claims

1. A method for bottom slag discharge in a slurry evaporator, characterized in that: During the evaporation of titanium tetrachloride slurry in the slurry evaporator, when the slurry evaporator is fully fed and evaporation begins, the slag discharge solenoid valve at the bottom of the slurry evaporator is kept energized, and the slag discharge solenoid valve is cooled and pressure-maintained.

2. The bottom slag discharge method for a slurry evaporator as described in claim 1, characterized in that: Includes the following steps: S1. Before the titanium tetrachloride slurry is fed into the slurry evaporator, clean the slag discharge solenoid valve and slag discharge channel at the bottom of the slurry evaporator. S2. When evaporation begins after feeding is completed, energize and maintain the slag discharge solenoid valve, and then continuously use nitrogen to cool and maintain the pressure of the slag discharge solenoid valve. S3. After the evaporation work of the slurry evaporator is completed, disconnect the power to the slag discharge solenoid valve; S4. After the slag discharge is completed, purge the slag discharge solenoid valve and the slag discharge channel.

3. The bottom slag discharge method for a slurry evaporator as described in claim 2, characterized in that: In step S1, compressed air is used to clean the slag discharge solenoid valve and the slag discharge channel.

4. The bottom slag discharge method for a slurry evaporator as described in claim 2, characterized in that: In step S1, the slurry evaporator keeps the slag discharge solenoid valve fully closed before feeding.

5. The bottom slag discharge method for a slurry evaporator as described in claim 2, characterized in that: In step S2, when nitrogen is used to cool and maintain the pressure of the slag discharge solenoid valve, the pressure range is maintained at 0.6 to 2.5 MPa.

6. The bottom slag discharge method for a slurry evaporator as described in claim 2, characterized in that: In step S2, when using nitrogen to cool and maintain the pressure of the slag discharge solenoid valve, the nitrogen flow rate is maintained within the range of 2-3 m³ / h. 3 / h.

7. The bottom slag discharge method for a slurry evaporator as described in claim 2, characterized in that: In step S3, after the evaporation work of the slurry evaporator is completed, the power to the slag discharge solenoid valve is turned off first, and then the cooling and pressure holding of the slag discharge battery valve are stopped.

8. The bottom slag discharge method for a slurry evaporator as described in claim 2, characterized in that: In step S4, after the slag discharge is completed, the slag discharge solenoid valve is fully open, and the slag discharge channel is purged with nitrogen cannon for 3 to 5 minutes before the slag discharge solenoid valve is closed.

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