Automatic control system for continuous pressure leaching of hydrochloric acid and use method of automatic control system

Abstract

The invention provides an automatic control system for hydrochloric acid continuous pressure leaching and a use method thereof. The automatic control system comprises: an autoclave; the feeding pump is connected with hydrochloric acid in the previous process; the flow meter is arranged on a pipeline for connecting nitrogen with the autoclave; the pressure gauge is arranged on the autoclave and the pipeline connected with the autoclave; the liquid level meter is arranged on the autoclave and is used for monitoring the height of a solution in the autoclave; the thermometer is arranged on the autoclave and is used for monitoring the temperature value of a solution in the autoclave; the valve group is arranged on the autoclave and the pipeline connected with the autoclave; the stirring device is arranged on the autoclave; and the central controller is electrically connected with the flow meter, the pressure gauge, the thermometer and the valve group. By means of the system, the feeding state of the autoclave can be automatically regulated and controlled, the preparation process can be conveniently monitored, debugged and alarmed, meanwhile, feeding liquid is stably fed, the liquid level of the autoclave is accurately controlled, and the fluctuation range of the pressure value is small.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic control, and in particular relates to an automatic control system for continuous pressure leaching of hydrochloric acid and a use method thereof. Background Art

[0002] At present, the production of artificial rutile mainly involves wet treatment to remove non-titanium impurities from high-titanium materials. Generally, the raw materials are processed by pressurized leaching with sulfuric acid; but the cost of sulfuric acid is higher than that of hydrochloric acid. Therefore, a hydrochloric acid pressure leaching method was designed, but there is currently no corresponding automatic control equipment for hydrochloric acid pressure leaching, and production can only be carried out through manual intervention, which greatly increases the cost. Therefore, it is necessary to design a standardized and reliable automatic control device. Summary of the invention

[0003] The purpose of the present invention is to solve the above technical problems and provide an automatic control system for continuous pressure leaching of hydrochloric acid and a method for using the same. The system can automatically pressurize and deliver hydrochloric acid to the next process, accurately control the pressure and temperature in the kettle, and has a high degree of automation, a standardized process, and can effectively produce qualified hydrochloric acid solutions.

[0004] To achieve the above object, the present invention adopts the following technical solution: The control system for continuous hydrochloric acid pressure leaching of the present invention comprises: Autoclave; Feed pump, which is connected to the hydrochloric acid in the previous process; A flow meter is provided on the pipeline connecting the nitrogen gas and the autoclave; A first pressure gauge is provided on the pipeline connecting the feed pump and the autoclave to monitor the pressure value of the solution in the pipeline; A second pressure gauge is provided on the pipeline connecting the nitrogen gas and the autoclave to monitor the pressure value of the nitrogen gas in the pipeline; A third pressure gauge is provided on a pipeline connecting the compressed air pipeline and the autoclave to monitor the pressure value of the compressed air in the pipeline; a fourth pressure gauge, provided on the autoclave, to monitor the pressure value in the autoclave; a fifth pressure gauge, arranged on the pipeline connecting the autoclave and the steam-water separator; A liquid level gauge, arranged on the pressure autoclave, to monitor the height of the solution in the autoclave; A thermometer is arranged on the autoclave to monitor the temperature of the solution in the autoclave; A valve group, including a steam valve provided on a pipeline connecting steam and the pressure autoclave, a pressurizing valve provided on a pipeline connecting nitrogen and compressed air to the pressure autoclave, an exhaust valve provided on a pipeline connecting a steam-water separator and the pressure autoclave, and a discharge valve provided on the pressure autoclave; A stirring device is arranged on the autoclave.

[0005] The central controller is electrically connected to the feed pump, valve group, flow meter, pressure gauge, liquid level gauge, and thermometer; wherein: The central controller uses a single-loop PID control method to adjust the opening of the steam valve according to the feedback value of the thermometer to adjust the temperature of the solution in the kettle.

[0006] The central controller uses a single-loop PID control method to adjust the opening of the discharge valve according to the feedback value of the liquid level meter to adjust the liquid level of the solution in the kettle.

[0007] A further preferred solution is that a parameter alarm program is provided in the central controller (11).

[0008] A further preferred solution is that a parameter alarm program is provided in the central controller.

[0009] The present invention also provides a method for using the above-mentioned hydrochloric acid continuous pressure leaching control system, comprising the following steps: S1. According to the preset program of the central controller, the opening of the exhaust valve is opened to 100%, the stirring device is started, and then the feed pump is started to allow the hydrochloric acid solution to enter the autoclave; S2. Open the steam valve according to the preset program of the central controller to allow steam to enter the autoclave and adjust the temperature of the solution in the autoclave to 110°C; at the same time, open the pressure valve to allow nitrogen and compressed air to enter the autoclave and increase the pressure in the autoclave to 0.25MPa; S3, the thermometer monitors the temperature value of the solution in the autoclave, the fourth pressure gauge monitors the pressure value in the autoclave, the first pressure gauge monitors the pressure value of the solution in the feed pump pipeline, the second pressure gauge monitors the pressure value in the nitrogen pipeline, the third pressure gauge monitors the pressure value in the compressed air pipeline, the fifth pressure gauge monitors the pressure value in the exhaust pipeline, and the monitoring data of the thermometer and the pressure gauge are uploaded to the central controller; S4. After the temperature and pressure in the autoclave are reached, the discharge valve is opened to start discharging the pressurized solution to the next process. At the same time, the liquid level gauge is started. The central controller adjusts the opening of the discharge valve according to the liquid level to maintain the liquid level of the solution in the autoclave. At the same time, the central controller adjusts the opening of the pressurizing valve according to the pressure value of the fourth pressure gauge to maintain the pressure in the autoclave.

[0010] The automatic control system for continuous hydrochloric acid pressurized leaching of the present invention can realize automatic pressurization and convey hydrochloric acid to the next process, accurately control the pressure and temperature in the autoclave, and the system has a high degree of automation, a standardized process, and can effectively produce qualified hydrochloric acid solutions; the system of the present invention can realize automatic regulation of the feeding state of the autoclave, and is convenient for monitoring, debugging, and alarming the preparation process; at the same time, the feeding of the feeding liquid is stable, the liquid level of the autoclave is accurately controlled, and the fluctuation range of the pressure value is small; at the same time, manual intervention is reduced, and the production cost is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the structural diagram of the automatic control system for continuous pressure leaching of hydrochloric acid; Figure 2 This is the control principle diagram of the discharge valve of the automatic control system for continuous pressure leaching of hydrochloric acid; Figure 3 This is the steam valve control schematic diagram of the automatic control system for continuous pressure leaching of hydrochloric acid; Figure 4 It is the control principle diagram of the exhaust valve and the pressure valve of the automatic control system for continuous pressure leaching of hydrochloric acid; Description of reference numerals: 1. Feed pump; 2. Flow meter; 3. First pressure gauge; 4. Second pressure gauge; 5. Third pressure gauge; 6. Fourth pressure gauge; 7. Fifth pressure gauge; 8. Liquid level gauge; 9. Thermometer; 10. Steam valve; 11. Central controller; 12. Pressurization valve; 13. Exhaust valve; 14. Discharge valve; 15. Pressure kettle; 16. Steam-water separator; 17. Stirring device. DETAILED DESCRIPTION

[0012] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0013] Unless otherwise defined, all professional terms used hereinafter have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention. Various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0014] like Figure 1 , which is a structural diagram of the automatic control system of the present invention, includes a feed pump 1, a valve group, a flow meter 2, a liquid level meter 8, a pressure gauge, a pressure kettle 15, and a stirring device 17.

[0015] The feed pump 1 is arranged on the pipeline connecting the hydrochloric acid of the previous process and the pressure autoclave 15; the valve group includes a steam valve 10 on the pipeline connecting the steam and the pressure autoclave 15, a pressurizing valve 12 arranged on the pipeline connecting the nitrogen and compressed air to the pressure autoclave 15, an exhaust valve 13 arranged on the pipeline connecting the steam-water separator 16 and the pressure autoclave 15, and a discharge valve 14 arranged on the pressure autoclave 15. The flow meter 2 is arranged on the pipeline connecting the autoclave 15 and the nitrogen to monitor the flow value of the nitrogen; the first pressure gauge 3 is arranged on the pipeline connecting the feed pump 1 and the autoclave 15 to monitor the pressure value of the outlet pipeline of the feed pump 1; the second pressure gauge 4 is arranged on the pipeline connecting the autoclave 15 and the nitrogen to monitor the pressure value of the nitrogen; the third pressure gauge 5 is arranged on the pipeline connecting the autoclave 15 and the compressed air to monitor the pressure value of the compressed air; the fourth pressure gauge 6 is arranged on the autoclave 15 to monitor the pressure value in the autoclave 15; the fifth pressure gauge 7 is arranged on the pipeline connecting the autoclave 15 and the steam-water separator 16 to monitor the pressure value on the exhaust pipeline; the liquid level meter 8 is arranged on the autoclave 15 to monitor the liquid level of the solution in the autoclave 15; the thermometer 9 is arranged on the autoclave 15 to monitor the temperature value of the solution in the autoclave 15. The central controller 11 is electrically connected to the flow meter 2, the liquid level meter 8, the thermometer 9, and the valve group, and controls the pressure, temperature, and liquid level in the autoclave 15 by controlling the opening of the valves. Figure 2-Figure 4 shown.

[0016] The central controller 11 uses a single-loop PID control method to adjust the opening of the steam valve 10 according to the feedback value of the thermometer 9 to adjust the temperature of the solution in the autoclave 15. The central controller 11 uses a single-loop PID control method to adjust the opening of the discharge valve 14 according to the feedback value of the liquid level meter 8 to adjust the liquid level of the solution in the autoclave 15. The central controller 11 uses a single-loop PID control method to adjust the opening of the exhaust valve 13 according to the feedback value of the fifth pressure gauge 7. The central controller 11 uses a single-loop PID control method to adjust the opening of the pressurization valve 12 according to the feedback value of the fourth pressure gauge 6. The central controller 11 is a device with logical calculation functions, capable of running program codes and processing data. In this embodiment, the central controller 11 is a desktop computer with a display screen for users to view relevant data. The central controller 11 controls the start and stop of the feed pump 1, and the central controller 11 controls the start and stop of the stirring device 17. The hydrochloric acid solution enters the pressure reactor 15 through the feed pump 1 to complete the pressurization. During this period, the flow meter 2, the liquid level meter 8, the pressure gauge and the thermometer 9 display the measured values ​​in real time on the central controller 11.

[0017] In the specific use process of this embodiment, first, the opening of the exhaust valve 13 is opened to 100% by the central controller 11, and the feed pump 1 and the stirring device 17 are turned on by the central controller 11 to ensure the feed speed.

[0018] The steam valve 10 is opened by the central controller 11 to make the temperature inside the autoclave 15 reach 110° C., and the pressurizing valve 12 is opened by the central controller 11 to make the pressure inside the autoclave 15 reach 0.25 MPa.

[0019] The central controller 11 uses a preset program to open the discharge valve 14 to discharge the feed liquid to the next process when the temperature inside the autoclave 15 reaches 110° C. and the pressure reaches 0.25 MPa.

[0020] The central controller 11 uses the PID to control the opening of the discharge valve 14 through the value fed back by the liquid level meter 8 to ensure that the height of the solution in the autoclave 15 is about 2.6m. The central controller 11 uses the PID to control the opening of the exhaust valve 13 and the pressure valve 12 through the value fed back by the fifth pressure gauge 7 and the fourth pressure gauge 6 to ensure that the pressure in the autoclave 15 is 0.1~0.25MPa.

[0021] The system also has an alarm function, the main contents of the alarm include equipment shutdown fault alarm, pressure alarm in the pipeline and autoclave 15, liquid level alarm, temperature alarm, the role is to remind the operator to make appropriate adjustments to the process parameters to ensure stable production operation and avoid accidents.

[0022] Specifically, the central controller 11 is arranged in the central control room. The central controller 11 is provided with a parameter alarm program, wherein PID control is a program of the central controller 11 .

[0023] Specifically, the alarm value of the first pressure gauge 3 is set to a low alarm value of 0.2MPa and a high alarm value of 0.5MPa; the alarm value of the second pressure gauge 4 is set to a low alarm value of 0.5MPa and a high alarm value of 0.9MPa; the alarm value of the third pressure gauge 5 is set to a low alarm value of 0.5MPa and a high alarm value of 0.9MPa; the alarm value of the fourth pressure gauge 6 is set to a low alarm value of 0.1MPa and a high alarm value of 0.55MPa; the alarm value of the fifth pressure gauge 7 is set to a low alarm value of 0.1MPa and a high alarm value of 0.55MPa; the alarm value of the liquid level meter 8 is set to a low alarm value of 0.3m and a high alarm value of 3.45m; the alarm value of the thermometer 9 is set to a low alarm value of 100℃ and a high alarm value of 120℃.

[0024] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An automatic control system for continuous pressure leaching of hydrochloric acid, comprising: Autoclave (15); A feed pump (1), connected to the hydrochloric acid in the previous process, used as a feed pump for feeding; A flow meter (2) is provided on a pipeline connecting the nitrogen gas and the autoclave (15); A pressure gauge is provided on the pressure autoclave (15) and a pipeline connected to the pressure autoclave (15); A liquid level meter (8) is provided on the pressure autoclave (15) to monitor the height of the solution in the autoclave; A thermometer (9) is arranged on the autoclave (15) to monitor the temperature of the solution in the autoclave; A valve group is arranged on the pressure autoclave (15) and a pipeline connected to the pressure autoclave (15); A stirring device (17) is provided on the autoclave (15); The central controller (11) is electrically connected to the feed pump (1), the valve group, the flow meter (2), the pressure gauge, the liquid level meter (8), and the thermometer (9).

2. The automatic control system for continuous hydrochloric acid pressure leaching according to claim 1, characterized in that: The pressure gauge includes the following: A first pressure gauge (3) is provided on a pipeline connecting the feed pump (1) and the autoclave (15) to monitor the pressure value of the solution in the pipeline; A second pressure gauge (4) is provided on a pipeline connecting nitrogen and the autoclave (15) to monitor the pressure value of nitrogen in the pipeline; A third pressure gauge (5) is provided on a pipeline connecting the compressed air pipeline and the autoclave (15) to monitor the pressure value of the compressed air in the pipeline; a fourth pressure gauge (6) provided on the autoclave (15) to monitor the pressure value in the autoclave (15); The fifth pressure gauge (7) is arranged on the pipeline connecting the pressure autoclave (15) and the steam-water separator (16).

3. The automatic control system for continuous hydrochloric acid pressure leaching according to claim 2, characterized in that: The valve group comprises: a steam valve (10) provided on a pipeline connecting steam and a pressure autoclave (15), a pressurizing valve (12) provided on a pipeline connecting nitrogen and compressed air to the pressure autoclave (15), an exhaust valve (13) provided on a pipeline connecting a steam-water separator (16) and the pressure autoclave (15), and a discharge valve (14) provided on the pressure autoclave (15).

4. The automatic control system for continuous hydrochloric acid pressure leaching according to claim 3, characterized in that: The central controller (11) uses a single-loop PID control method to adjust the opening of the steam valve (10) according to the feedback value of the thermometer (9) to adjust the temperature of the solution in the autoclave (15); the central controller (11) uses a single-loop PID control method to adjust the opening of the discharge valve (14) according to the feedback value of the liquid level meter (8) to adjust the liquid level of the solution in the autoclave (15).

5. The automatic control system for continuous hydrochloric acid pressure leaching according to claim 3, characterized in that: A parameter alarm program is provided in the central controller (11).

6. A method for using an automatic control system for continuous hydrochloric acid pressure leaching, which is implemented using the automatic control system for hydrochloric acid pressure leaching as described in any one of claims 3 to 5, characterized in that: The following steps are involved: S1, according to the preset program of the central controller (11), the opening of the exhaust valve (13) is opened to 100%, the stirring device (17) is started, and then the feed pump (1) is started to allow the hydrochloric acid solution to enter the autoclave (15); S2, according to the preset program of the central controller (11), the steam valve (10) is opened to allow steam to enter the autoclave (15), and the temperature of the solution in the autoclave (15) is adjusted to 110° C.; at the same time, the pressurizing valve (12) is opened to allow nitrogen and compressed air to enter the autoclave, and the pressure in the autoclave is increased to 0.25 MPa; S3, the thermometer (9) monitors the temperature value of the solution in the autoclave (15), the fourth pressure gauge (6) monitors the pressure value in the autoclave (15), the first pressure gauge (3) monitors the pressure value of the solution in the feed pump (1) pipeline, the second pressure gauge (4) monitors the pressure value in the nitrogen pipeline, the third pressure gauge (5) monitors the pressure value in the compressed air pipeline, and the fifth pressure gauge (7) monitors the pressure value in the exhaust pipeline. The monitoring data of the thermometer (9) and the pressure gauge are uploaded to the central controller (11); S4. After the temperature and pressure in the autoclave (15) are reached, the discharge valve (14) is opened to start discharging the pressurized solution to the next process. At the same time, the liquid level gauge (8) is started. The central controller (11) adjusts the opening of the discharge valve (14) according to the liquid level to maintain the liquid level of the solution in the autoclave (15). At the same time, the central controller (11) adjusts the opening of the pressurizing valve (12) according to the pressure value of the fourth pressure gauge (6) to maintain the pressure in the autoclave (15).

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