System and automatic control method for calcining seed crystal washing procedure in titanium dioxide production by sulfuric acid method

Abstract

The invention discloses a system for a calcination seed crystal washing process in titanium dioxide production by a sulfuric acid method, and relates to the technical field of chemical engineering automation control. The device comprises a rutile seed crystal diaphragm filter press, a 2% lye tank, a 10% lye tank, a rutile seed crystal filter press squeezed water storage tank, a soda boiled material cooling storage tank, a recycled water and rutile seed crystal filter-pressed recycled water storage tank and a rutile seed crystal desalted water storage tank, the lower left corner water outlet is connected with a left water outlet valve, and the lower right corner water outlet is connected with a right water outlet valve; the left water outlet valve and the right water outlet valve are both connected with a 2% lye tank; and the left water outlet valve and the right water outlet valve are both connected with a 10% lye tank. According to the invention, one-key starting of the calcining seed crystal washing process is realized; the full-automatic control and circulation process of the calcining seed crystal washing procedure is realized; errors during manual operation are reduced; and the time of each process can be accurately controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical automation control, and more specifically, it is a system for the calcined seed washing process in titanium dioxide production by the sulfuric acid method. The present invention also relates to an automatic control method for such a system for the calcined seed washing 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 calcined seed washing process in the industry is relatively low, and the control process is on-site manual and partially remote manual. The following main problems exist when manually controlling the calcined seed washing process:

[0003] 1) The calcined seed washing process has relatively strict requirements for the feed rate of metatitanic acid and the washing duration. According to the process-setting parameters, the feeding and washing are automatically carried out. When manually operating, if the valve is not closed or the pump is not stopped in time, the added amount is inaccurate, affecting the product quality. If forgetting to close the valve or stop the pump, it will cause equipment damage and material loss, and in severe cases, personal injury.

[0004] 2) Manual feeding is prone to material shortage, affecting production efficiency.

[0005] Therefore, it is necessary to develop a system for the calcined seed washing 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 provide a system for the calcined seed washing 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 such a system for the calcined seed washing process in titanium dioxide production by the sulfuric acid method

[0008] To achieve the above first object, the technical solution of the present invention is: A system for the calcined seed washing process in titanium dioxide production by the sulfuric acid method, characterized in that it includes a rutile seed diaphragm filter press, a 2% alkali solution tank, a 10% alkali solution tank, a rutile seed filter press pressing water storage tank, a material cooling storage tank after alkali boiling, a recycled water storage tank for rutile seeds after filter pressing, and a rutile seed demineralized water storage tank;

[0009] The rutile seed diaphragm filter press is provided with a lower left water outlet, a lower right water outlet, a pressing inlet and outlet, a feed water inlet, an upper left inlet and outlet connection port, and an upper right inlet and outlet connection port;

[0010] The lower left water outlet is connected to a left water outlet valve, and the lower right water outlet is connected to a right water outlet valve; both the left water outlet valve and the right water outlet valve are connected to the 2% alkali solution tank through a dilute waste alkali storage tank inlet valve, and both the left water outlet valve and the right water outlet valve are connected to the 10% alkali solution tank through a concentrated waste alkali storage tank inlet valve;

[0011] The squeezing inlet and outlet are connected to the side of the bottom of the rutile seed filter press squeezing water storage tank through the first squeezing pressure relief valve, and the squeezing inlet and outlet are connected to the top of the rutile seed filter press squeezing water storage tank through the second squeezing pressure relief valve;

[0012] The feeding water inlet is connected to the side of the bottom of the material cooling storage tank after alkali boiling through the filter press feeding valve;

[0013] The recycled water storage tank after rutile seed filtration is connected to the feeding water inlet through the recycled water washing valve, and is connected to the left outlet valve and the right outlet valve through the valve for entering the recycled water storage tank;

[0014] The rutile seed demineralized water storage tank is connected to the feeding water inlet through the demineralized water washing valve, is connected to the upper left inlet and outlet connection through the upper left washing valve, and is connected to the upper right inlet and outlet connection through the upper right washing valve.

[0015] In the above technical solution, it further includes a material storage tank after the rutile seed filter press, and the material storage tank after the rutile seed filter press is connected to the bottom of the rutile seed diaphragm filter press.

[0016] In the above technical solution, compressed air is connected to the feeding water inlet through the positive blowing valve.

[0017] In the above technical solution, the recycled water storage tank after rutile seed filtration is connected to the recycled water washing valve through the recycled water washing pump.

[0018] In the above technical solution, the rutile seed filter press squeezing water storage tank is connected to the first squeezing pressure relief valve through the squeezing pump.

[0019] In the above technical solution, the material cooling storage tank after alkali boiling is connected to the filter press feeding valve through the filter press feeding pump.

[0020] In the above technical solution, the demineralized water washing valve, the upper left washing valve, and the upper right washing valve are all connected to the rutile seed demineralized water storage tank through the demineralized water washing pump.

[0021] In the above technical solution, the recycled water storage tank after rutile seed filtration is provided with a liquid level gauge.

[0022] In order to achieve the above second object, the technical solution of the present invention is: an automatic control method for the water washing process of calcined seeds in sulfuric acid process titanium dioxide production, which is characterized by including the following steps:

[0023] Step 1: Manually press the button;

[0024] Step 2: Open the first squeezing pressure relief valve, open the left outlet valve, open the right outlet valve; open the valve for entering the concentrated waste alkali storage tank for 5 seconds;

[0025] Step 3: Open the feed valve of the filter press;

[0026] Step 4: Open the feed valve of the filter press for 5 seconds and then start the feed pump of the filter press;

[0027] Step 5: Keep the feed pump of the filter press running for the time set by the calculation model; then stop the feed pump of the filter press;

[0028] Step 6: Close the feed valve of the filter press for 5 seconds and then close the feed valve;

[0029] Step 7: Close the feed valve of the filter press for 5 seconds and then open the valve to the dilute waste alkali storage tank;

[0030] Step 8: Open the valve to the dilute waste alkali storage tank for 5 seconds and then close the valve to the concentrated waste alkali storage tank;

[0031] Step 9: Close the valve to the concentrated waste alkali storage tank for 5 seconds and then open the recycled water washing valve;

[0032] Step 10: Open the recycled water washing valve for 5 seconds and then start the recycled water washing pump;

[0033] Step 11: Stop the recycled water washing pump when the running time of the recycled water washing pump reaches the time set by the calculation model or when the level gauge detects that the water in the recycled water rutile seed filter press for the reuse water storage tank is higher than the set level;

[0034] Step 12: Stop the recycled water washing pump for 5 seconds and then close the recycled water washing valve;

[0035] Step 13: Close the recycled water washing valve for 5 seconds and then open the demineralized water washing valve;

[0036] Step 14: Open the demineralized water washing valve for 5 seconds and then start the demineralized water washing pump;

[0037] Step 15: When the running time of the demineralized water washing pump reaches the time set by the calculation model, open the valve to the recycled water storage tank and close the valve to the dilute waste alkali storage tank;

[0038] Step 16: When the running time of the demineralized water washing pump reaches the time set by the calculation model, open the upper left washing valve and close the left outlet valve;

[0039] Step 17: When the running time of the demineralized water washing pump reaches the set time, open the upper right washing valve and the left outlet valve and close the demineralized water washing valve;

[0040] Step 18: Open the upper right washing valve and the left outlet valve for 5 seconds and close the upper left washing valve and the right outlet valve;

[0041] Step 19: When the running time of the demineralized water washing pump reaches the time set by the calculation model, stop the demineralized water washing pump;

[0042] Step 20: Stop the demineralized water washing pump for 5 seconds and then open the right outlet valve;

[0043] Step 21: The right water outlet valve opens for 5 seconds, and the upper right washing valve closes;

[0044] Step 22: The upper right washing valve closes for 5 seconds, and the first pressing pressure relief valve closes;

[0045] Step 23: The second pressing pressure relief valve closes for 5 seconds, and the pressing pump starts;

[0046] Step 24: When the opening time of the pressing pump reaches the time set by the calculation model, the pressing pump closes;

[0047] Step 25: The pressing pump closes for 5 seconds, and the second pressing pressure relief valve opens;

[0048] Step 26: The second pressing pressure relief valve opens for 5 seconds, and the positive blowing valve opens;

[0049] Step 27: When the opening time of the positive blowing valve reaches the set time, the positive blowing valve closes;

[0050] Step 28: The positive blowing valve closes for 5 seconds, and the valve for entering the recovery water storage tank, the second pressing pressure relief valve, the left water outlet valve, and the right water outlet valve close;

[0051] Step 29: Without pressing the program start button again, the DSC second system automatically detects the start conditions and automatically proceeds with steps 2 - 28.

[0052] In the above technical solution, the water washing calculation model: The set time of the desalted water washing pump in the calculation model = the cumulative material feed volume × (the specific gravity of the material - 1) × the concentration coefficient × the set desalted water washing duration;

[0053] The set time of the recovery water washing pump in the calculation model = the cumulative material feed volume × (the specific gravity of the material - 1) × the concentration coefficient × the set recovery water washing duration;

[0054] The calculation model for the opening time of the pressing pump is = the set pressing time + the time required for the actual pressing pressure to reach the set pressure from the start of the pressing pump.

[0055] Compared with the prior art, the present invention has the following advantages:

[0056] 1) The present invention realizes one - key start of the calcined seed water washing process; realizes full - automatic control and cyclic process of the calcined seed water washing process; reduces errors during manual operation; and can precisely control the time of each process.

[0057] 2) The present invention enables full - automatic control and data monitoring of the calcined seed water washing process from feed water washing to plate unloading, avoiding the imbalance of production stability caused by parameter disorders;

[0058] 3) The operation of the present invention is simple, with a high degree of automation, high safety factor, and good stability, truly realizing the automatic control of the process. It not only reduces the labor intensity but also reduces the production cost.

[0059] 4) The present invention establishes a calculation model for adding demineralized water. According to the material density and the feed rate, the addition amount is measured in real time, and the water washing duration is automatically adjusted. Brief Description of the Drawings

[0060] Figure 1 It is a schematic structural diagram of the present invention.

[0061] Among them, 100 - rutile seed diaphragm filter press, 110 - lower left water outlet, 120 - lower right water outlet, 121 - right water outlet valve, 130 - press inlet and outlet water connection, 140 - feed water inlet, 150 - upper left inlet and outlet water connection, 160 - upper right inlet and outlet water connection, 210 - 2% caustic soda solution tank, 211 - valve for entering dilute waste caustic soda storage tank, 220 - 10% caustic soda solution tank, 221 - valve for entering concentrated waste caustic soda storage tank, 300 - rutile seed filter press press water storage tank, 310 - first press pressure relief valve, 320 - second press pressure relief valve, 330 - press pump, 400 - material cooling storage tank after alkali boiling, 410 - filter press feed valve, 420 - filter press feed pump, 500 - recycled water storage tank after rutile seed filter press filtration, 510 - recycled water washing valve, 520 - valve for entering recycled water storage tank, 530 - recycled water washing pump, 540 - liquid level gauge, 600 - rutile seed demineralized water storage tank, 610 - demineralized water washing valve, 620 - demineralized water washing pump, 700 - material storage tank after rutile seed filter press. Detailed Embodiment

[0062] The following will describe in detail the implementation of the present invention in conjunction with 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.

[0063] Referring to the drawings, it can be seen that the system for the water washing process of calcined seeds in sulfuric acid process titanium dioxide production is characterized in that it includes a rutile seed diaphragm filter press 100, a 2% caustic soda solution tank 210, a 10% caustic soda solution tank 220, a rutile seed filter press press water storage tank 300, a material cooling storage tank 400 after alkali boiling, a recycled water storage tank 500 after rutile seed filter press filtration, and a rutile seed demineralized water storage tank 600;

[0064] The rutile seed diaphragm filter press 100 is provided with a lower left water outlet 110, a lower right water outlet 120, a press inlet and outlet water connection 130, a feed water inlet 140, an upper left inlet and outlet water connection 150, and an upper right inlet and outlet water connection 160;

[0065] The lower left outlet 110 is connected to the left outlet valve 111, and the lower right outlet 120 is connected to the right outlet valve 121; both the left outlet valve 111 and the right outlet valve 121 are connected to the 2% alkali solution tank 210 through the dilute waste alkali storage tank valve 211, and both the left outlet valve 111 and the right outlet valve 121 are connected to the 10% alkali solution tank 220 through the concentrated waste alkali storage tank valve 221;

[0066] The pressing inlet and outlet 130 is connected to the side of the bottom of the rutile seed press water storage tank 300 through the first pressing pressure relief valve 310, and the pressing inlet and outlet 130 is connected to the top of the rutile seed press water storage tank 300 through the second pressing pressure relief valve 320;

[0067] The feed water inlet 140 is connected to the side of the bottom of the material cooling storage tank 400 after alkali cooking through the filter press feed valve 410;

[0068] The recycled water storage tank 500 after rutile seed filtration is connected to the feed water inlet 140 through the recycled water washing valve 510 and is connected to the left outlet valve 111 and the right outlet valve 121 through the recycled water storage tank valve 520;

[0069] The rutile seed demineralized water storage tank 600 is connected to the feed water inlet 140 through the demineralized water washing valve 610, is connected to the upper left inlet and outlet connection 150 through the upper left washing valve 151, and is connected to the upper right inlet and outlet connection 160 through the upper right washing valve 161.

[0070] It further includes a material storage tank 700 after the rutile seed filter press, and the material storage tank 700 after the rutile seed filter press is connected to the bottom of the rutile seed diaphragm filter press 100.

[0071] Compressed air is connected to the feed water inlet 140 through the positive blowing valve 170.

[0072] The recycled water storage tank 500 after rutile seed filtration is connected to the recycled water washing valve 510 through the recycled water washing pump 530.

[0073] The rutile seed press water storage tank 300 is connected to the first pressing pressure relief valve 310 through the pressing pump 330.

[0074] The material cooling storage tank 400 after alkali cooking is connected to the filter press feed valve 410 through the filter press feed pump 420.

[0075] The demineralized water washing valve 610, the upper left washing valve 151, and the upper right washing valve 161 are all connected to the rutile seed demineralized water storage tank 600 through the demineralized water washing pump 620.

[0076] The recycled water storage tank 500 after rutile seed filtration is provided with a liquid level gauge 540.

[0077] Automatic control method for the water washing process of calcined seeds in titanium dioxide production by sulfuric acid method, characterized by comprising the following steps:

[0078] Step 1: Manually press the start button;

[0079] Step 2: Open the first pressing pressure relief valve 310, the left water outlet valve 111, and the right water outlet valve 121; Open the valve 221 for the concentrated waste alkali storage tank for 5 seconds;

[0080] Step 3: Open the filter press feed valve 410;

[0081] Step 4: Open the filter press feed valve 410 for 5 seconds and start the filter press feed pump 420;

[0082] Step 5: The opening time of the filter press feed pump 420 reaches the time set by the calculation model; The filter press feed pump 420 is closed;

[0083] Step 6: Close the filter press feed pump 420 for 5 seconds and close the filter press feed valve 410;

[0084] Step 7: Close the filter press feed valve 410 for 5 seconds and open the valve 211 for the dilute waste alkali storage tank;

[0085] Step 8: Open the valve 211 for the dilute waste alkali storage tank for 5 seconds and close the valve 221 for the concentrated waste alkali storage tank;

[0086] Step 9: Close the valve 221 for the concentrated waste alkali storage tank for 5 seconds and open the recovery water washing valve 510;

[0087] Step 10: Open the recovery water washing valve 510 for 5 seconds and start the recovery water washing pump 530;

[0088] Step 11: The opening time of the recovery water washing pump 530 reaches the time set by the calculation model or the level gauge 540 detects that the recycled water rutile seed filter press backwater storage tank 500 is higher than the set liquid level, and the recovery water washing pump 530 stops;

[0089] Step 12: Stop the recovery water washing pump 530 for 5 seconds and close the recovery water washing valve 510;

[0090] Step 13: Close the recovery water washing valve 510 for 5 seconds; Open the demineralized water washing valve 610;

[0091] Step 14: Open the demineralized water washing valve 610 for 5 seconds and start the demineralized water washing pump 620;

[0092] Step 15: The opening time of the demineralized water washing pump 620 reaches the time set by the calculation model, open the valve 520 for the recovery water storage tank, and close the valve 211 for the dilute waste alkali storage tank;

[0093] Step 16: When the opening time of the demineralized water wash pump 620 reaches the time set by the calculation model, the wash valve 151 in the upper left corner opens and the left outlet valve 111 closes;

[0094] Step 17: When the opening time of the demineralized water wash pump 620 reaches the set time, the wash valve 161 in the upper right corner and the left outlet valve 111 open, and the demineralized water wash valve 610 closes;

[0095] Step 18: The wash valve 161 in the upper right corner and the left outlet valve 111 open for 5 seconds, and the wash valve 151 in the upper left corner and the right outlet valve 121 close;

[0096] Step 19: When the opening time of the demineralized water wash pump 620 reaches the time set by the calculation model, the demineralized water wash pump 620 closes;

[0097] Step 20: The demineralized water wash pump 620 closes for 5 seconds, and the right outlet valve 121 opens;

[0098] Step 21: The right outlet valve 121 opens for 5 seconds, and the wash valve 161 in the upper right corner closes;

[0099] Step 22: The wash valve 161 in the upper right corner closes for 5 seconds, and the first pressing pressure relief valve 310 closes;

[0100] Step 23: The second pressing pressure relief valve 320 closes for 5 seconds, and the pressing pump 330 starts;

[0101] Step 24: When the opening time of the pressing pump 330 reaches the time set by the calculation model, the pressing pump 330 closes;

[0102] Step 25: The pressing pump 330 closes for 5 seconds, and the second pressing pressure relief valve 320 opens;

[0103] Step 26: The second pressing pressure relief valve 320 opens for 5 seconds, and the positive blowing valve 170 opens;

[0104] Step 27: When the opening time of the positive blowing valve 170 reaches the set time, the positive blowing valve 170 closes;

[0105] Step 28: The positive blowing valve 170 closes for 5 seconds, and the valve 520 for entering the recovery water storage tank, the second pressing pressure relief valve 320, the left outlet valve 111, and the right outlet valve 121 close;

[0106] Step 29: Without pressing the program start button again, the DSC second system automatically detects the start conditions, and the automatic steps proceed from 2 to 28.

[0107] Water wash calculation model: The set time of the calculation model for the demineralized water wash pump 620 = cumulative material feed volume × (specific gravity of the material - 1) × concentration coefficient × set demineralized water wash duration;

[0108] The set time of the calculation model of the recycle water washing pump 530 = the cumulative amount of material feed × (specific gravity of the material - 1) × concentration coefficient × set recycle water washing duration;

[0109] The calculation model for the opening time of the pressing pump 330 is = set pressing time + the time required for the actual pressing pressure to reach the set pressure from the start of the pressing pump 330 startup.

[0110] Other parts not described belong to the prior art.

Claims

1. System for the water washing process of calcined seeds in titanium dioxide production by sulfuric acid method, characterized in that: It includes a rutile seed diaphragm filter press (100), a 2% caustic solution tank (210), a 10% caustic solution tank (220), a rutile seed filter press press water storage tank (300), a material cooling storage tank after caustic boiling (400), a recycled water storage tank for rutile seeds after filter pressing (500), and a rutile seed demineralized water storage tank (600); The rutile seed diaphragm filter press (100) is provided with a lower left water outlet (110), a lower right water outlet (120), a press inlet and outlet (130), a feed water inlet (140), an upper left inlet and outlet connection port (150), and an upper right inlet and outlet connection port (160); The lower left water outlet (110) is connected to a left water outlet valve (111), and the lower right water outlet (120) is connected to a right water outlet valve (121); both the left water outlet valve (111) and the right water outlet valve (121) are connected to the 2% caustic solution tank (210) through a dilute waste caustic storage tank valve (211), and both the left water outlet valve (111) and the right water outlet valve (121) are connected to the 10% caustic solution tank (220) through a concentrated waste caustic storage tank valve (221); The press inlet and outlet (130) is connected to the side of the bottom of the rutile seed filter press press water storage tank (300) through a first press relief valve (310), and the press inlet and outlet (130) is connected to the top of the rutile seed filter press press water storage tank (300) through a second press relief valve (320); The feed water inlet (140) is connected to the side of the bottom of the material cooling storage tank after caustic boiling (400) through a filter press feed valve (410); The recycled water storage tank for rutile seeds after filter pressing (500) is connected to the feed water inlet (140) through a recycled water washing valve (510), and is connected to the left water outlet valve (111) and the right water outlet valve (121) through a recycled water storage tank inlet valve (520); The rutile seed demineralized water storage tank (600) is connected to the feed water inlet (140) through a demineralized water washing valve (610), is connected to the upper left inlet and outlet connection port (150) through an upper left washing valve (151), and is connected to the upper right inlet and outlet connection port (160) through an upper right washing valve (161).

2. The system for the water washing process of the calcined seed in titanium dioxide production by sulfuric acid method according to claim 1, characterized in that: It further includes a material storage tank after the rutile seed filter press (700), and the material storage tank after the rutile seed filter press (700) is connected to the bottom of the rutile seed diaphragm filter press (100).

3. The system for the water washing process of calcined seeds in titanium dioxide production by sulfuric acid method according to claim 1, characterized in that: Compressed air is connected to the feed water inlet (140) through a positive blowing valve (170).

4. The system for the water washing process of the calcined seed in titanium dioxide production by sulfuric acid method according to claim 1, wherein: The recycled water storage tank for rutile seeds after filter pressing (500) is connected to the recycled water washing valve (510) through a recycled water washing pump (530).

5. The system for the water washing process of the calcined seed in the sulfuric acid process titanium dioxide production according to claim 1, characterized in that: The rutile seed filter press press water storage tank (300) is connected to the first press relief valve (310) through a press pump (330).

6. The system for the water washing process of the calcined seed in the sulfuric acid process titanium dioxide production according to claim 1, characterized in that: The material cooling storage tank after caustic boiling (400) is connected to the filter press feed valve (410) through a filter press feed pump (420).

7. The system for the water washing process of the calcined seed in the sulfuric acid process titanium dioxide production according to claim 1, characterized in that: The demineralized water washing valve (610), the upper left washing valve (151), and the upper right washing valve (161) are all connected to the rutile seed demineralized water storage tank (600) through a demineralized water washing pump (620).

8. The system for the washing process of the calcined seeds in the sulfuric acid process titanium dioxide production according to claim 4, characterized in that: The reuse water storage tank (500) for the recycled rutile seed crystal after pressure filtration is provided with a liquid level gauge (540).

9. An automatic control method for the water washing process of calcined seeds in titanium dioxide production by sulfuric acid process, characterized in that, It includes the following steps: Step 1: Manually start the button; Step 2: The first squeezing relief valve (310) opens, the left water outlet valve (111) opens, and the right water outlet valve (121) opens; the valve (221) for entering the concentrated waste alkali storage tank opens for 5 seconds; Step 3: The pressure filter feed valve (410) opens; Step 4: The pressure filter feed valve (410) opens for 5 seconds, and the pressure filter feed pump (420) opens; Step 5: The opening time of the pressure filter feed pump (420) reaches the time set by the calculation model; the pressure filter feed pump (420) is closed; Step 6: The pressure filter feed pump (420) is closed for 5 seconds, and the pressure filter feed valve (410) is closed; Step 7: The pressure filter feed valve (410) is closed for 5 seconds, and the valve (211) for entering the dilute waste alkali storage tank opens; Step 8: The valve (211) for entering the dilute waste alkali storage tank opens for 5 seconds, and the valve (221) for entering the concentrated waste alkali storage tank is closed; Step 9: The valve (221) for entering the concentrated waste alkali storage tank is closed for 5 seconds, and the recycled water washing valve (510) opens; Step 10: The recycled water washing valve (510) opens for 5 seconds, and the recycled water washing pump (530) opens; Step 11: The opening time of the recycled water washing pump (530) reaches the time set by the calculation model or the liquid level gauge (540) detects that the reuse water storage tank (500) for the recycled rutile seed crystal after pressure filtration is higher than the set liquid level, and the recycled water washing pump (530) stops; Step 12: The recycled water washing pump (530) stops for 5 seconds, and the recycled water washing valve (510) is closed; Step 13: The recycled water washing valve (510) is closed for 5 seconds; the demineralized water washing valve (610) opens; Step 14: The demineralized water washing valve (610) opens for 5 seconds, and the demineralized water washing pump (620) opens; Step 15: The opening time of the demineralized water washing pump (620) reaches the time set by the calculation model, the valve (520) for entering the recycled water storage tank opens, and the valve (211) for entering the dilute waste alkali storage tank is closed; Step 16: The opening time of the demineralized water washing pump (620) reaches the time set by the calculation model, the upper left corner washing valve (151) opens, and the left water outlet valve (111) is closed; Step 17: The opening time of the demineralized water washing pump (620) reaches the set time, the upper right corner washing valve (161) and the left water outlet valve (111) open, and the demineralized water washing valve (610) is closed; Step 18: The upper right corner washing valve (161) and the left water outlet valve (111) open for 5 seconds, and the upper left corner washing valve (151) and the right water outlet valve (121) are closed; Step 19: The opening time of the demineralized water washing pump (620) reaches the time set by the calculation model, and the demineralized water washing pump (620) is closed; Step 20: The demineralized water washing pump (620) is closed for 5 seconds, and the right water outlet valve (121) opens; Step 21: The right water outlet valve (121) opens for 5 seconds, and the upper right corner washing valve (161) is closed; Step 22: The upper right corner washing valve (161) is closed for 5 seconds, and the first squeezing relief valve (310) is closed; Step 23: The second squeezing relief valve (320) is closed for 5 seconds, and the squeezing pump (330) opens; Step 24: When the opening time of the pressing pump (330) reaches the time set by the calculation model, the pressing pump (330) is closed; Step 25: The pressing pump (330) is closed for 5 seconds, and the second pressing pressure relief valve (320) is opened; Step 26: The second pressing pressure relief valve (320) is opened for 5 seconds, and the positive blowing valve (170) is opened; Step 27: When the opening time of the positive blowing valve (170) reaches the set time, the positive blowing valve (170) is closed; Step 28: The positive blowing valve (170) is closed for 5 seconds, and the valve for entering the recycled water storage tank (520), the second pressing pressure relief valve (320), the left water outlet valve (111), and the right water outlet valve (121) are closed; Step 29: Without pressing the program start button again, the DSC second system automatically detects the start conditions, and the automatic steps proceed from 2 to 28.

10. The automatic control method for the calcined seed washing process in sulfuric acid process titanium dioxide production according to claim 9, characterized in that: Washing calculation model: The set time of the calculation model of the demineralized water washing pump (620) = the cumulative material feed amount × (specific gravity of the material - 1) × concentration coefficient × set demineralized water washing duration; The set time of the calculation model of the recycled water washing pump (530) = the cumulative material feed amount × (specific gravity of the material - 1) × concentration coefficient × set recycled water washing duration; The calculation model for the opening time of the pressing pump (330) is = set pressing time + the time required for the actual pressing pressure to reach the set pressure from the start of the pressing pump (330).

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