System for process of producing sol from titanium dioxide by sulfuric acid method and automatic control method of system

Abstract

The invention discloses a system for a process of producing sol from titanium dioxide by a sulfuric acid method, and relates to the technical field of chemical automation control. The device comprises a sol pot, a rutile seed filter press rear material storage tank and a rutile seed hydrochloric acid storage tank, desalted water is introduced into the sol pot, and steam is introduced into the sol pot; a rear material storage tank of the rutile seed crystal filter press is connected with the sol pot; and the rutile seed crystal hydrochloric acid storage tank is connected with the sol pot. According to the invention, one-key start of the sol process is realized; and the full-automatic control and circulation process of the sol process is realized. The invention further relates to an automatic control method of the system for the process of producing the sol from the titanium dioxide by the sulfuric acid method.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical industrial automation control, and more specifically, it is a system for the sol process in titanium dioxide production by the sulfuric acid method. The present invention also relates to an automatic control method for the system of the sol process in titanium dioxide production by the sulfuric acid method. Background Art

[0002] At present, the degree of automation in the production process of the conventional sol process in the industry is relatively low, and the control process is on-site manual and partially remote manual. The following main problems exist during the manual control operation of the sol process:

[0003] 1) There are relatively strict requirements for the addition amounts of metatitanic acid, hydrochloric acid, and demineralized water in the sol process. According to the specific gravity of metatitanic acid, calculations are carried out according to the formula to determine the addition amounts of hydrochloric acid and demineralized water. If the valves are not closed or the pumps are not stopped in time during manual operation, the addition amounts will be inaccurate, affecting the product quality. If the valves are forgotten to be closed or the pumps are forgotten to be stopped, it will cause the leakage of dangerous chemicals and material losses, and in serious cases, personnel will be injured;

[0004] 2) Manual feeding is prone to situations of overflowing and lack of materials, affecting the production efficiency.

[0005] Therefore, it is necessary to develop a system for the sol process in titanium dioxide production by the sulfuric acid method and its automatic control method. Summary of the Invention

[0006] The first object of the present invention is to overcome the deficiencies of the above background art, and to provide a system for the sol process in titanium dioxide production by the sulfuric acid method.

[0007] The second object of the present invention is to provide an automatic control method for the system of the sol process in titanium dioxide production by the sulfuric acid method

[0008] In order to achieve the above first object, the technical solution of the present invention is: A system for the sol process in titanium dioxide production by the sulfuric acid method, characterized in that: it includes a sol pot, a storage tank for materials after the rutile seed filter press, and a rutile seed hydrochloric acid storage tank. Demineralized water is connected to the top of the sol pot through the demineralized water inlet valve of the sol pot, and steam is connected to the bottom of the sol pot through the steam heating valve of the sol pot;

[0009] The storage tank for materials after the rutile seed filter press is connected to the sol pot through the feed valve of the sol pot;

[0010] The rutile seed hydrochloric acid storage tank is connected to the sol pot through the hydrochloric acid inlet valve of the sol pot.

[0011] In the above technical solution, it further includes a storage tank for materials after the sol. The sol pot is connected to the storage tank for materials after the sol through the bottom discharge valve of the sol pot.

[0012] In the above technical solution, the material storage tank after the rutile seed filter press is connected to the feed valve of the sol pot through the transfer centrifugal pump for the material after the rutile seed filter press and the flowmeter for the feed to the sol pot in sequence.

[0013] In the above technical solution, the demineralized water is connected to the demineralized water inlet valve of the sol pot through the flowmeter for adding demineralized water to the sol pot.

[0014] In the above technical solution, the hydrochloric acid storage tank for rutile seeds is connected to the hydrochloric acid inlet valve of the sol pot through the flowmeter for adding hydrochloric acid to the sol pot.

[0015] In the above technical solution, a stirrer and a thermometer are arranged in the sol pot.

[0016] In the above technical solution, a level gauge is arranged in the storage tank for the material after the sol.

[0017] In order to achieve the above second object, the technical solution of the present invention is: an automatic control method for the sol process in titanium dioxide production by sulfuric acid process, characterized by comprising the following steps:

[0018] Step 1, manual start;

[0019] Step 2, the feed valve of the sol pot is opened;

[0020] Step 3, the feed valve of the sol pot is opened for 5 seconds, and the transfer centrifugal pump for the material after the rutile seed filter press is started;

[0021] Step 4, when the transfer centrifugal pump for the material after the rutile seed filter press is started for a set time, the stirrer of the sol pot is started;

[0022] Step 5, when the cumulative amount measured by the flowmeter for the feed to the sol pot reaches the set value, the transfer centrifugal pump for the material after the rutile seed filter press is closed;

[0023] Step 6, the transfer centrifugal pump for the material after the rutile seed filter press is closed for 5 seconds, and the feed valve of the sol pot is closed;

[0024] Step 7, the feed valve of the sol pot is closed for 5 seconds, and the hydrochloric acid inlet valve of the sol pot is opened;

[0025] Step 8, when the cumulative amount measured by the flowmeter for adding hydrochloric acid to the sol pot reaches the set value, the hydrochloric acid inlet valve of the sol pot is closed;

[0026] Step 9, when the closing time of the hydrochloric acid inlet valve of the sol pot reaches the set time, a pH confirmation is popped up to confirm the pH value in the sol pot;

[0027] Step 10, click the pH confirmation;

[0028] Step 11, the steam heating valve of the sol pot is opened to the set opening degree;

[0029] Step 12, the thermometer detects that the temperature of the sol pot reaches the set temperature, and the steam heating valve of the sol pot is closed;

[0030] Step 13, pH retest and confirm;

[0031] Step 14, the hydrochloric acid inlet valve of the sol pot is opened;

[0032] Step 15, the hydrochloric acid flowmeter in the sol pot reaches the cumulative amount set by the calculation model, and the hydrochloric acid inlet valve of the sol pot is closed;

[0033] Step 16, the hydrochloric acid inlet valve of the sol pot is closed for 5 seconds, and the steam temperature-raising valve of the sol pot is opened to the set opening;

[0034] Step 17, the thermometer detects that the temperature of the sol pot reaches the set temperature;

[0035] Step 18, the steam temperature-raising valve of the sol pot is opened to a set opening;

[0036] Step 19, after the steam heating valve of the sol pot is opened to the set opening for 3000 seconds, the steam heating valve of the sol pot is closed;

[0037] Step 20, the desalted water inlet valve of the sol pot is opened;

[0038] Step 21, the flow meter for adding desalted water to the sol pot reaches the cumulative amount set by the calculation model, and the desalted water inlet valve of the sol pot is closed;

[0039] Step 22, the closing time of the desalted water valve inlet to the sol pot reaches the set time;

[0040] Step 23, after the liquid level meter detects that the material storage tank is lower than the set liquid level, the bottom valve of the sol pot is opened;

[0041] Step 24, the opening time of the bottom valve of the sol pot reaches the set time, confirming that the discharge is completed; the bottom valve of the sol pot is closed, and the agitator of the sol pot is turned off;

[0042] Step 25, there is no need to press the program start button again, the DC seconds system automatically detects the start conditions and automatically performs steps 2-24.

[0043] In the above technical solution, the calculation model for adding hydrochloric acid is: the volume of hydrochloric acid added = the cumulative amount of metatitanic acid material fed × (metatitanic acid specific gravity - 1) × concentration coefficient × the proportion of hydrochloric acid added ÷ the concentrated specific gravity of hydrochloric acid;

[0044] Calculation model for adding desalted water: desalted water added volume = titanic acid concentration × cumulative amount of titanic acid feed ÷ set volume of titanic acid feed - (cumulative amount of titanic acid feed + cumulative amount of hydrochloric acid feed + steam volume).

[0045] Compared with the prior art, the present invention has the following advantages:

[0046] 1) The present invention realizes one - key start of the sol process; it realizes full - automatic control and cyclic process of the sol process.

[0047] 2) The present invention enables full - automatic control and data monitoring of the sol process from feeding, detection, calculation, quantitative addition of auxiliary materials, to discharging, avoiding the imbalance of production stability caused by parameter disorders, and improving control precision and efficiency.

[0048] 3) The control method of the present invention can accurately control the time of each process, reduce errors during manual operation, and improve the accuracy of execution.

[0049] 4) The present invention is easy to operate, has a high degree of automation, a high safety factor, and good stability. It truly realizes full - automatic control of the whole process of the sol process, reduces labor intensity, decreases production costs, and improves production efficiency.

[0050] 5) The present invention establishes a calculation model for the addition of hydrochloric acid and demineralized water. Through the material density and feed rate, according to the parameters of the added auxiliary material medium, the addition amount is calculated in real - time and the addition amount is automatically adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic structural diagram of the present invention.

[0052] Among them, 100 - sol pot, 110 - demineralized water inlet valve of the sol pot, 120 - steam heating valve of the sol pot, 130 - bottom discharge valve of the sol pot, 140 - demineralized water addition flowmeter of the sol pot, 150 - stirrer of the sol pot, 160 - thermometer, 200 - storage tank for materials after rutile seed press filter, 210 - feed valve of the sol pot, 220 - transfer centrifugal pump for materials after rutile seed press filter, 230 - feed flowmeter of the sol pot, 300 - hydrochloric acid storage tank for rutile seeds, 310 - hydrochloric acid inlet valve of the sol pot, 320 - hydrochloric acid addition flowmeter of the sol pot, 400 - storage tank for materials after sol, 410 - level gauge. DETAILED DESCRIPTION OF THE INVENTION

[0053] The implementation of the present invention will be described in detail below with reference to the drawings. However, they do not constitute a limitation to the present invention and are only for illustration purposes. At the same time, the advantages of the present invention will become clearer and easier to understand through the description.

[0054] Referring to the drawings, it can be seen that a system for the sol process in sulfuric acid process titanium dioxide production is characterized in that it includes a sol pot 100, a storage tank 200 for materials after rutile seed press filter, and a hydrochloric acid storage tank 300 for rutile seeds. Demineralized water is connected to the top of the sol pot 100 through the demineralized water inlet valve 110 of the sol pot, and steam is connected to the bottom side of the sol pot 100 through the steam heating valve 120 of the sol pot;

[0055] The material storage tank 200 after the rutile seed press filter is connected to the top of the sol pot 100 through the sol pot feed valve 210;

[0056] The rutile seed hydrochloric acid storage tank 300 is connected to the top of the sol pot 100 through the sol pot hydrochloric acid feed valve 310.

[0057] It further includes a post-sol material storage tank 400, and the bottom side of the sol pot 100 is connected to the post-sol material storage tank 400 through the sol pot discharge bottom valve 130.

[0058] The material storage tank 200 after the rutile seed press filter is connected to the sol pot feed valve 210 through the rutile seed press filter post-material transfer centrifugal pump 220 and the sol pot feed flowmeter 230 in sequence.

[0059] Demineralized water is connected to the sol pot demineralized water feed valve 110 through the sol pot demineralized water feed flowmeter 140.

[0060] The rutile seed hydrochloric acid storage tank 300 is connected to the sol pot hydrochloric acid feed valve 310 through the sol pot hydrochloric acid feed flowmeter 320.

[0061] A sol pot stirrer 150 and a thermometer 160 are arranged in the sol pot 100.

[0062] A level gauge 410 is arranged in the post-sol material storage tank 400.

[0063] An automatic control method for the sol production process in sulfuric acid process titanium dioxide production, characterized by comprising the following steps:

[0064] Step 1, manual start;

[0065] Step 2, the sol pot feed valve 210 is opened;

[0066] Step 3, the sol pot feed valve 210 is opened for 5 seconds, and the rutile seed press filter post-material transfer centrifugal pump 220 is opened;

[0067] Step 4, when the rutile seed press filter post-material transfer centrifugal pump 220 is opened for a set time, the sol pot stirrer 150 is opened;

[0068] Step 5, when the sol pot feed flowmeter 230 reaches the set cumulative amount, the rutile seed press filter post-material transfer centrifugal pump 220 is closed;

[0069] Step 6, the rutile seed press filter post-material transfer centrifugal pump 220 is closed for 5 seconds, and the sol pot feed valve 210 is closed;

[0070] Step 7, the sol pot feed valve 210 is closed for 5 seconds, and the sol pot hydrochloric acid feed valve 310 is opened;

[0071] Step 8, when the hydrochloric acid flowmeter 320 in the sol pot reaches the set cumulative amount, the hydrochloric acid inlet valve 310 of the sol pot is closed;

[0072] Step 9, when the closing time of the hydrochloric acid inlet valve 310 of the sol pot reaches the set time, a pH confirmation pops up to confirm the pH value in the sol pot 100;

[0073] Step 10, click on the pH confirmation;

[0074] Step 11, open the steam heating valve 120 of the sol pot to the set opening;

[0075] Step 12, when the thermometer 160 detects that the temperature of the sol pot 100 reaches the set temperature, close the steam heating valve 120 of the sol pot;

[0076] Step 13, recheck and confirm the pH;

[0077] Step 14, open the hydrochloric acid inlet valve 310 of the sol pot;

[0078] Step 15, when the hydrochloric acid flowmeter 320 in the sol pot reaches the set cumulative amount calculated by the model, close the hydrochloric acid inlet valve 310 of the sol pot;

[0079] Step 16, close the hydrochloric acid inlet valve 310 of the sol pot for 5 seconds, and open the steam heating valve 120 of the sol pot to the set opening;

[0080] Step 17, when the thermometer 160 detects that the temperature of the sol pot 100 reaches the set temperature;

[0081] Step 18, open the steam heating valve 120 of the sol pot to the set opening;

[0082] Step 19, after the steam heating valve 120 of the sol pot is opened to the set opening for 3000 seconds, close the steam heating valve 120 of the sol pot;

[0083] Step 20, open the demineralized water inlet valve 110 of the sol pot;

[0084] Step 21, when the demineralized water flowmeter 140 in the sol pot reaches the set cumulative amount calculated by the model, close the demineralized water inlet valve 110 of the sol pot;

[0085] Step 22, when the closing time of the demineralized water inlet valve 110 of the sol pot reaches the set time;

[0086] Step 23, when the level gauge 410 detects that the material storage tank 400 after the sol is below the set level, open the bottom discharge valve 130 of the sol pot;

[0087] Step 24, when the opening time of the bottom discharge valve 130 of the sol pot reaches the set time, confirm the end of discharging; close the bottom discharge valve 130 of the sol pot and close the stirrer 150 of the sol pot;

[0088] Step 25: Without pressing the program start button again, the DC second system automatically detects the start conditions and automatically proceeds to Steps 2 - 24.

[0089] Hydrochloric acid addition calculation model: Hydrochloric acid addition volume = Cumulative feed volume of metatitanic acid material × (Specific gravity of metatitanic acid - 1) × Concentration coefficient × Proportion of hydrochloric acid added ÷ Specific gravity of concentrated hydrochloric acid;

[0090] Desalted water addition calculation model: Desalted water addition volume = Concentration of metatitanic acid × Cumulative feed volume of metatitanic acid ÷ Set volume of metatitanic acid feed - (Cumulative feed volume of metatitanic acid + Cumulative feed volume of hydrochloric acid + Steam volume).

[0091] In actual use, the bottom of the post - sol - material storage tank 400 is connected to the bleaching tank through the post - sol - material transfer centrifugal pump 420; Agitators are provided in both the post - rutile - seed - press - filter material storage tank 200 and the post - sol - material storage tank 400.

[0092] Other parts not described belong to the prior art.

Claims

1. A system for the sol process in titanium dioxide production by sulfuric acid method, characterized in that: It includes a sol pot (100), a storage tank (200) for the material after the rutile seed filter press, and a hydrochloric acid storage tank (300) for rutile seeds. Demineralized water is connected to the top of the sol pot (100) through the demineralized water inlet valve (110) of the sol pot, and steam is connected to the bottom of the sol pot (100) through the steam heating valve (120) of the sol pot; The storage tank (200) for the material after the rutile seed filter press is connected to the sol pot (100) through the feed valve (210) of the sol pot; The hydrochloric acid storage tank (300) for rutile seeds is connected to the sol pot (100) through the hydrochloric acid inlet valve (310) of the sol pot.

2. The system for the sol process in titanium dioxide production by sulfuric acid method according to claim 1, characterized in that: It also includes a storage tank (400) for the material after the sol. The sol pot (100) is connected to the storage tank (400) for the material after the sol through the bottom discharge valve (130) of the sol pot.

3. The system for the sol process in titanium dioxide production by sulfuric acid method according to claim 2, characterized in that: The storage tank (200) for the material after the rutile seed filter press is connected to the feed valve (210) of the sol pot through the transfer centrifugal pump (220) for the material after the rutile seed filter press and the feed flowmeter (230) of the sol pot in sequence.

4. A system for the sol process in titanium dioxide production by sulfuric acid method according to claim 3, characterized in that: Demineralized water is connected to the demineralized water inlet valve (110) of the sol pot through the demineralized water flowmeter (140) added to the sol pot.

5. The system for the sol process in titanium dioxide production by sulfuric acid method according to claim 4, characterized in that: The hydrochloric acid storage tank (300) for rutile seeds is connected to the hydrochloric acid inlet valve (310) of the sol pot through the hydrochloric acid flowmeter (320) added to the sol pot.

6. The system for the sol process in titanium dioxide production by sulfuric acid method according to claim 1, characterized in that: A stirrer (150) and a thermometer (160) are arranged in the sol pot (100).

7. A system for the sol process in titanium dioxide production by sulfuric acid method according to claim 2, characterized in that: A liquid level gauge (410) is arranged in the storage tank (400) for the material after the sol.

8. An automatic control method for the sol process in titanium dioxide production by sulfuric acid method, characterized in that, It includes the following steps: Step 1, manual start; Step 2, the feed valve (210) of the sol pot is opened; Step 3, the feed valve (210) of the sol pot is opened for 5 seconds, and the transfer centrifugal pump (220) for the material after the rutile seed filter press is started; Step 4, when the transfer centrifugal pump (220) for the material after the rutile seed filter press is started for a set time, the stirrer (150) of the sol pot is started; Step 5, when the feed flowmeter (230) of the sol pot reaches the set cumulative amount, the transfer centrifugal pump (220) for the material after the rutile seed filter press is closed; Step 6, the transfer centrifugal pump (220) for the material after the rutile seed filter press is closed for 5 seconds, and the feed valve (210) of the sol pot is closed; Step 7, the feed valve (210) of the sol pot is closed for 5 seconds, and the hydrochloric acid inlet valve (310) of the sol pot is opened; Step 8, when the hydrochloric acid flowmeter (320) added to the sol pot reaches the set cumulative amount, the hydrochloric acid inlet valve (310) of the sol pot is closed; Step 9, when the closing time of the hydrochloric acid inlet valve (310) of the sol pot reaches the set time, a pH confirmation is popped up to confirm the pH value in the sol pot (100); Step 10, click the pH confirmation; Step 11, the steam heating valve (120) of the sol pot is opened to the set opening degree; Step 12, when the thermometer (160) detects that the temperature of the sol pot (100) reaches the set temperature, the steam heating valve (120) of the sol pot is closed; Step 13, pH retest confirmation; Step 14, the hydrochloric acid inlet valve (310) of the sol pot is opened; Step 15, when the hydrochloric acid flowmeter (320) added to the sol pot reaches the cumulative amount set by the calculation model, the hydrochloric acid inlet valve (310) of the sol pot is closed; Step 16, the hydrochloric acid inlet valve (310) of the sol pot is closed for 5 seconds, and the steam heating valve (120) of the sol pot is opened to the set opening degree; Step 17, the thermometer (160) detects that the temperature of the sol pot (100) reaches the set temperature; Step 18, the steam heating valve (120) of the sol pot is opened to the set opening degree; Step 19, after the steam heating valve (120) of the sol pot is opened to the set opening degree for 3000 seconds, the steam heating valve (120) of the sol pot is closed; Step 20, the demineralized water inlet valve (110) of the sol pot is opened; Step 21, when the demineralized water flowmeter (140) for adding demineralized water to the sol pot reaches the set cumulative amount of the calculation model, the demineralized water inlet valve (110) of the sol pot is closed; Step 22, the closing time of the demineralized water inlet valve (110) of the sol pot reaches the set time; Step 23, the level gauge (410) detects that the material storage tank (400) after the sol in the sol pot is lower than the set liquid level, and the bottom discharge valve (130) of the sol pot is opened; Step 24, when the opening time of the bottom discharge valve (130) of the sol pot reaches the set time, confirm that the discharging is completed; the bottom discharge valve (130) of the sol pot is closed, and the stirrer (150) of the sol pot is closed; Step 25, without pressing the program start button again, the DC second system automatically detects the start conditions and automatically performs Steps 2-24.

9. An automatic control method for the sol process in titanium dioxide production by sulfuric acid method according to claim 8, characterized in that: Hydrochloric acid addition calculation model: Hydrochloric acid addition volume = Cumulative amount of metatitanic acid material feed × (Specific gravity of metatitanic acid - 1) × Concentration coefficient × Proportion of added hydrochloric acid ÷ Specific gravity of hydrochloric acid concentration; Demineralized water addition calculation model: Demineralized water addition volume = Concentration of metatitanic acid × Cumulative amount of metatitanic acid feed ÷ Set volume of metatitanic acid feed - (Cumulative amount of metatitanic acid feed + Cumulative amount of hydrochloric acid feed + Steam volume).

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