Production process of methyl sodium silicate powder

Abstract

The invention provides a production process of methyl sodium silicate powder. The production process of the sodium methyl silicate powder comprises the following steps: adding a sodium hydroxide solution for dissolving and reacting, detecting pH and supplementing reactants, introducing nitrogen to exhaust air, concentrating a sodium methyl silicate solution, drying and grinding to prepare powder. According to the method, part of the sodium hydroxide solution is added to react with the methyl sodium silicate, whether the reaction is complete or not is judged by detecting the pH value, and reactants are supplemented if the reaction is not complete, so that waste of the methyl sodium silicate and sodium hydroxide impurities in the prepared methyl sodium silicate are reduced, and the purity of the methyl sodium silicate powder is improved.

Description

Technical Field

[0001] The invention relates to the technical field of chemical synthesis, and in particular to a production process of sodium methyl silicate powder. Background Art

[0002] Sodium methyl silicate is an organic compound. Since sodium methyl silicate is easily decomposed by weak acids, it decomposes into methyl silicic acid when it encounters water and carbon dioxide in the air, and quickly polymerizes to form polymethylsiloxane with waterproof properties. Therefore, it is usually used as a waterproof material for new rigid buildings. It can be used as a waterproofing agent for materials such as concrete, limestone, gypsum products, red bricks, stucco and newly-made bricks and tiles, and can also be used as an additive for mortar.

[0003] At present, the simplest preparation method of sodium methyl silicate is to react methyl silicic acid with sodium hydroxide solution to produce sodium methyl silicate. However, since methyl silicic acid usually contains impurities, it is difficult to make the reactants react completely if it reacts directly with sodium hydroxide solution, which easily causes residual methyl silicic acid or excessive sodium hydroxide solution, resulting in waste of resources, and thus causing the sodium methyl silicate powder obtained after drying to contain solid impurities of sodium hydroxide, affecting the purity of the sodium methyl silicate powder.

[0004] Therefore, we propose a production process of sodium methyl silicate powder which reduces waste and improves the purity of sodium methyl silicate powder. Summary of the invention

[0005] In view of the shortcomings of the prior art, the object of the present invention is to provide a production process of sodium methyl silicate powder.

[0006] A production process of sodium methyl silicate powder comprises the following steps:

[0007] S1: Add sodium hydroxide solution to dissolve and react

[0008] Adding sodium hydroxide solution to methylsilicic acid, heating and stirring to dissolve, reacting to obtain a suspension;

[0009] S2: Check pH and add reactants

[0010] Detect the pH of the suspension, if the pH is less than 6, add sodium hydroxide solution, if the pH is greater than 7, add methylsilicic acid, until the pH is 6 to 7, and then centrifuge to obtain solid impurities of the sodium methylsilicic acid solution;

[0011] S3: Introduce nitrogen and exhaust air

[0012] After adding the above sodium methyl silicate solution into the concentrator, nitrogen is introduced into the concentrator until all the air in the concentrator is exhausted;

[0013] S4: Concentrate the sodium methyl silicate solution and dry it

[0014] The sodium methyl silicate solution is heated and concentrated to 1 / 3 of the original volume, and then the temperature is adjusted to increase, and the heating is continued and dried to obtain a sodium methyl silicate solid;

[0015] S5: Grinding and milling

[0016] The discharge assembly of the concentrator is opened, and the sodium methyl silicate solid is put into the grinder through the discharge assembly. After grinding for 30 to 50 minutes, the sodium methyl silicate powder is sieved to obtain the sodium methyl silicate powder.

[0017] Furthermore, the step S1 of adding sodium hydroxide solution to dissolve and react specifically comprises the following steps:

[0018] S1.1: nitrogen is introduced into the reactor to discharge the air in the reactor until the first nitrogen concentration detector in the reactor detects that the nitrogen concentration in the reactor is 95-99%, and the first nitrogen concentration detector sends a signal to the controller;

[0019] S1.2: After receiving the signal sent by the first nitrogen concentration detector, the controller controls the feed assembly to add methylsilicic acid into the reactor until the first gravity sensor in the reactor detects that the gravity in the reactor no longer increases, and the first gravity sensor sends a signal to the controller;

[0020] S1.3: After receiving the signal sent by the first gravity sensor, the controller controls the hydraulic pump to start, and pumps the sodium hydroxide solution into the reactor at a uniform speed through the hydraulic pump;

[0021] S1.4: When the first gravity sensor detects that the gravity in the reactor increases again, the first gravity sensor sends a signal to the controller again;

[0022] S1.5: After receiving the signal sent by the first gravity sensor again, the controller controls the stirrer to stir at a rate of 500-600 r / min, and controls the heater to heat to 80-90° C. to react;

[0023] S1.6: When the liquid solid content detector in the reactor detects that the solid content in the liquid system in the reactor is 10-15%, the liquid solid content detector sends a signal to the controller;

[0024] S1.7: After receiving the signal from the liquid solid content detector, the controller controls the hydraulic pump to close and continues the reaction for 1 to 2 hours to obtain a suspension.

[0025] Furthermore, the step S2 of detecting pH and replenishing reactants specifically comprises the following steps:

[0026] S2.1: If the internal pH detector of the reactor detects that the pH of the suspension prepared in step S1.7 is less than 6, the pH detector sends a signal to the controller;

[0027] S2.2: After the controller receives the signal sent by the pH detector, it controls the hydraulic pump to start and continue to add sodium hydroxide solution to the suspension until the pH detector detects that pH = 6-7, and the pH detector sends a signal to the controller again;

[0028] S2.3: After receiving two signals from the pH detector, the controller controls the hydraulic pump and the agitator to be turned off, and controls the centrifugal assembly of the reactor to be turned on, and centrifuges the suspension to obtain a sodium methyl silicate solution and solid impurities;

[0029] S2.4: If the pH detector in the reactor detects that the pH of the suspension is greater than 7, the pH detector sends three signals to the controller;

[0030] S2.5: After receiving the three signals sent by the pH detector, the controller controls the sprayer in the reactor to start, and methylsilicic acid is uniformly sprayed into the reactor through the sprayer;

[0031] S2.6: until the pH detector detects that pH = 6-7, the pH detector sends a signal to the controller again;

[0032] S2.7: After receiving four signals from the pH detector, the controller controls the sprayer and the stirrer to be turned off, and controls the centrifugal assembly of the reactor to be turned on, and centrifuges the suspension to obtain a sodium methyl silicate solution and solid impurities;

[0033] S2.8: If the pH detector in the reactor detects that the pH of the suspension is 6≤pH≤7, the pH detector sends five signals to the controller;

[0034] S2.9: After receiving five signals sent by the pH detector, the controller controls the centrifugal component of the reactor to start, and centrifuges the suspension to obtain a sodium methyl silicate solution and solid impurities.

[0035] Furthermore, the step S3 of introducing nitrogen to exhaust air specifically includes the following steps:

[0036] S3.1: The sodium methyl silicate solution obtained in step S2 passes through the filter membrane and enters the concentrator along the slide pipe. When the second gravity sensor in the concentrator detects that the gravity in the concentrator increases, the second gravity sensor sends a signal to the controller;

[0037] S3.2: After receiving the signal sent by the second gravity sensor, the controller controls the air pump to start, and nitrogen is introduced into the concentrator through the air pump to discharge the air in the concentrator;

[0038] S3.3: When the second nitrogen concentration detector in the concentrator detects that the nitrogen concentration in the concentrator is 95-99%, the second nitrogen concentration detector sends a signal to the controller;

[0039] S3.4: After receiving the signal sent by the second nitrogen concentration detector, the controller controls the air pump to turn off.

[0040] Furthermore, the concentrated sodium methyl silicate solution in step S4 and drying the solution specifically comprises the following steps:

[0041] S4.1: Subsequently, the controller controls the concentrator to heat to 90-95° C. to concentrate the sodium methyl silicate solution obtained in step S3.1;

[0042] S4.2: until the liquid level sensor in the concentrator detects that the liquid level of the sodium methyl silicate solution has dropped to 1 / 3 of the original level, the liquid level sensor sends a signal to the controller;

[0043] S4.3: After receiving the signal sent by the liquid level sensor, the controller controls the heating temperature of the concentrator to be adjusted to 120-135°C, and continues heating for 2-4 hours to dry and obtain sodium methyl silicate solid;

[0044] S4.4: The controller then controls the concentrator to stop heating and controls the vacuum valve of the grinder to open, so that the inside of the grinder is processed into a vacuum environment.

[0045] Furthermore, in step S3.2, after the controller receives the signal sent by the second gravity sensor, it controls the air pump to start, and the air pump first extracts the hot nitrogen in the reactor after the reaction is completed, and then passes the hot nitrogen into the concentrator, and the cold air in the concentrator is discharged from the outlet valve in the concentrator through the hot nitrogen, until the controller receives the signal sent by the second concentration detector, and the controller controls the air pump to close while also controlling the outlet valve to close.

[0046] Furthermore, after being processed by the vacuum valve, the vacuum degree in the grinding machine is -0.5 to -0.2 MPa.

[0047] Furthermore, the particle fineness of the sodium methyl silicate powder is 100-120 meshes.

[0048] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0049] 1. The present invention first adds part of the sodium hydroxide solution to react with methylsilicic acid, and then determines whether the reaction is complete by detecting the pH value. If the reaction is not complete, the reactant is supplemented, thereby reducing the waste of methylsilicic acid and reducing the sodium hydroxide impurities in the prepared sodium methylsilicate, thereby improving the purity of the sodium methylsilicate powder.

[0050] 2. The present invention uses a controller to connect sensors and detectors with various machines and equipment to achieve automated production, which simplifies the process and saves manpower.

[0051] 3. The present invention introduces nitrogen into the reactor and the concentrator to exhaust the air in the concentrator to prevent the generated sodium methyl silicate from being decomposed by contacting water and carbon dioxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 The present invention is a flowchart of the production process of sodium methyl silicate powder used in the embodiment of the present invention. DETAILED DESCRIPTION

[0053] The present invention is further described in detail below with reference to specific embodiments.

[0054] Example 1

[0055] A production process of sodium methyl silicate powder, such as Figure 1 As shown, the following steps are included:

[0056] S1: Add sodium hydroxide solution to dissolve and react

[0057] Nitrogen is introduced into the reactor to discharge the air in the reactor until the first nitrogen concentration detector in the reactor detects that the nitrogen concentration in the reactor is 99%, the first nitrogen concentration detector sends a signal to the controller, and after the controller receives the signal sent by the first nitrogen concentration detector, it controls the feed assembly to add methylsilicic acid into the reactor until the first gravity sensor in the reactor detects that the gravity in the reactor no longer increases, the first gravity sensor sends a signal to the controller, and after the controller receives the signal sent by the first gravity sensor, it controls the hydraulic pump to start, and pumps sodium hydroxide solution into the reactor at a uniform speed through the hydraulic pump, and when the first gravity sensor detects that the gravity in the reactor increases again, the first gravity sensor sends a signal to the controller again, and after the controller receives the signal sent by the first gravity sensor again, it controls the agitator to stir at a rate of 500r / min, and controls the heater to heat to 80°C to react until the liquid solid content detector in the reactor detects that the solid content in the liquid system in the reactor is 15%, the liquid solid content detector sends a signal to the controller, and after the controller receives the signal sent by the liquid solid content detector, it controls the hydraulic pump to close, and after continuing the reaction for 1h, a suspension is obtained;

[0058] S2: Check pH and add reactants

[0059] If the pH detector in the reactor detects that the pH of the suspension prepared in step S1 is less than 6, the pH detector sends a signal to the controller once. After receiving the signal sent by the pH detector once, the controller controls the hydraulic pump to start and continues to add sodium hydroxide solution to the suspension until the pH detector detects that the pH is 6. The pH detector sends a signal to the controller again. After receiving the two signals sent by the pH detector, the controller controls the hydraulic pump to close and the agitator to close, and controls the centrifugal component of the reactor to start, centrifuge the suspension to obtain sodium methyl silicate solution and solid impurities. If the pH detector in the reactor detects that the pH of the suspension is greater than 7, the pH detector sends a signal to the controller three times. After receiving the three signals sent by the pH detector, the controller controls the sprayer in the reactor to start, and sprays methyl silicate into the reactor at a uniform speed through the sprayer until the pH detector reaches 6. When the pH detector detects that pH=6, the pH detector sends a signal to the controller again. After the controller receives four signals sent by the pH detector, it controls the sprayer and the stirrer to be closed, and controls the centrifugal component of the reactor to be opened, and the suspension is centrifuged to obtain a sodium methyl silicate solution and solid impurities. If the pH detector in the reactor detects that the pH of the suspension is 6≤pH≤7, the pH detector sends a signal to the controller five times. After the controller receives five signals sent by the pH detector, it controls the centrifugal component of the reactor to be opened, and the suspension is centrifuged to obtain a sodium methyl silicate solution and solid impurities. First, part of the sodium hydroxide solution is added to react with the methyl silicate, and then the pH is detected to determine whether the reaction is complete. If it is not complete, the reactant is supplemented, thereby reducing the waste of methyl silicate and reducing the sodium hydroxide impurities in the prepared sodium methyl silicate, thereby improving the purity of the sodium methyl silicate powder;

[0060] S3: Introduce nitrogen and exhaust air

[0061] The sodium methyl silicate solution obtained in step S2 passes through the filter membrane and enters the concentrator along the slide pipe. When the second gravity sensor in the concentrator detects that the gravity in the concentrator increases, the second gravity sensor sends a signal to the controller. After receiving the signal sent by the second gravity sensor, the controller controls the air pump to start. The air pump first extracts the hot nitrogen in the reactor after the reaction in step S2 is completed, and then passes the hot nitrogen into the concentrator. The cold air in the concentrator is discharged from the air outlet valve in the concentrator through the hot nitrogen until the second nitrogen concentration detector in the concentrator detects that the nitrogen concentration in the concentrator is 99%. The second nitrogen concentration detector sends a signal to the controller. After receiving the signal sent by the second nitrogen concentration detector, the controller controls the air pump and the air outlet valve to close. Nitrogen is passed into the reactor and the concentrator to exhaust the air in the concentrator to prevent the generated sodium methyl silicate from being decomposed when it encounters water and carbon dioxide.

[0062] S4: Concentrate the sodium methyl silicate solution and dry it

[0063] Subsequently, the controller controls the concentrator to heat to 90°C, and concentrates the sodium methyl silicate solution obtained in step S3 until the liquid level sensor in the concentrator detects that the liquid level of the sodium methyl silicate solution has dropped to 1 / 3 of the original level. The liquid level sensor sends a signal to the controller. After receiving the signal sent by the liquid level sensor, the controller controls the heating temperature of the concentrator to be adjusted to 120°C, and continues heating for 2 hours for drying to obtain solid sodium methyl silicate. Subsequently, the controller controls the concentrator to stop heating, and controls the vacuum valve of the grinder to open, and processes the inside of the grinder into a vacuum environment with a vacuum degree of -0.2MPa. By using the controller to connect sensors and detectors with various machines and equipment, automated production is realized, the process is simple, and the effect of saving manpower is achieved.

[0064] S5: Grinding and milling

[0065] The discharge assembly of the concentrator was opened, and the sodium methyl silicate solid was put into the grinder through the discharge assembly. After grinding for 30 minutes, the solid was sieved to obtain sodium methyl silicate powder with a particle size of 100 mesh.

[0066] Example 2

[0067] A production process of sodium methyl silicate powder, such as Figure 1 As shown, the following steps are included:

[0068] S1: Add sodium hydroxide solution to dissolve and react

[0069] Nitrogen is introduced into the reactor to discharge the air in the reactor until the first nitrogen concentration detector in the reactor detects that the nitrogen concentration in the reactor is 99%, the first nitrogen concentration detector sends a signal to the controller, and after the controller receives the signal sent by the first nitrogen concentration detector, it controls the feeding component to add methylsilicic acid into the reactor until the first gravity sensor in the reactor detects that the gravity in the reactor no longer increases, the first gravity sensor sends a signal to the controller, and after the controller receives the signal sent by the first gravity sensor, it controls the hydraulic pump to start, and pumps sodium hydroxide solution into the reactor at a uniform speed through the hydraulic pump, and when the first gravity sensor detects that the gravity in the reactor increases again, the first gravity sensor sends a signal to the controller again, and after the controller receives the signal sent by the first gravity sensor again, it controls the agitator to stir at a rate of 500r / min, and controls the heater to heat to 90°C to react until the liquid solid content detector in the reactor detects that the solid content in the liquid system in the reactor is 15%, the liquid solid content detector sends a signal to the controller, and after the controller receives the signal sent by the liquid solid content detector, it controls the hydraulic pump to close, and after continuing the reaction for 1h, a suspension is obtained;

[0070] S2: Check pH and add reactants

[0071] If the pH detector in the reactor detects that the pH of the suspension prepared in step S1 is less than 6, the pH detector sends a signal to the controller once. After the controller receives the signal sent by the pH detector once, it controls the hydraulic pump to start, and continues to add sodium hydroxide solution to the suspension until the pH detector detects that the pH is 7. The pH detector sends a signal to the controller again. After the controller receives the signals sent by the pH detector twice, it controls the hydraulic pump to close and the agitator to close, and controls the centrifugal component of the reactor to start, centrifuge the suspension to obtain sodium methyl silicate solution and solid impurities. If the pH detector in the reactor detects that the pH of the suspension is greater than 7, the pH detector sends a signal to the controller three times. After the controller receives the signals sent by the pH detector three times, it controls the sprayer in the reactor to start, and sprays methyl silicate into the reactor at a uniform speed through the sprayer until the pH detector reaches 7. When the pH detector detects that pH=7, the pH detector sends a signal to the controller again. After the controller receives four signals sent by the pH detector, it controls the sprayer and the stirrer to be closed, and controls the centrifugal component of the reactor to be opened, and the suspension is centrifuged to obtain a sodium methyl silicate solution and solid impurities. If the pH detector in the reactor detects that the pH of the suspension is 6≤pH≤7, the pH detector sends a signal to the controller five times. After the controller receives five signals sent by the pH detector, it controls the centrifugal component of the reactor to be opened, and the suspension is centrifuged to obtain a sodium methyl silicate solution and solid impurities. First, part of the sodium hydroxide solution is added to react with the methyl silicate, and then the pH is detected to determine whether the reaction is complete. If it is not complete, the reactant is supplemented, thereby reducing the waste of methyl silicate and reducing the sodium hydroxide impurities in the prepared sodium methyl silicate, thereby improving the purity of the sodium methyl silicate powder;

[0072] S3: Introduce nitrogen and exhaust air

[0073] The sodium methyl silicate solution obtained in step S2 passes through the filter membrane and enters the concentrator along the slide pipe. When the second gravity sensor in the concentrator detects that the gravity in the concentrator increases, the second gravity sensor sends a signal to the controller. After receiving the signal sent by the second gravity sensor, the controller controls the air pump to start. The air pump first extracts the hot nitrogen in the reactor after the reaction in step S2 is completed, and then passes the hot nitrogen into the concentrator. The cold air in the concentrator is discharged from the air outlet valve in the concentrator through the hot nitrogen until the second nitrogen concentration detector in the concentrator detects that the nitrogen concentration in the concentrator is 99%. The second nitrogen concentration detector sends a signal to the controller. After receiving the signal sent by the second nitrogen concentration detector, the controller controls the air pump and the air outlet valve to close. Nitrogen is passed into the reactor and the concentrator to exhaust the air in the concentrator to prevent the generated sodium methyl silicate from being decomposed when it encounters water and carbon dioxide.

[0074] S4: Concentrate the sodium methyl silicate solution and dry it

[0075] Subsequently, the controller controls the concentrator to heat to 95°C, and concentrates the sodium methyl silicate solution obtained in step S3 until the liquid level sensor in the concentrator detects that the liquid level of the sodium methyl silicate solution has dropped to 1 / 3 of the original level. The liquid level sensor sends a signal to the controller. After receiving the signal sent by the liquid level sensor, the controller controls the heating temperature of the concentrator to be adjusted to 135°C, and continues heating for 2 hours for drying to obtain sodium methyl silicate solid. Subsequently, the controller controls the concentrator to stop heating, and controls the vacuum valve of the grinder to open, and processes the inside of the grinder into a vacuum environment with a vacuum degree of -0.5MPa. By using the controller to connect sensors and detectors with various machines and equipment, automated production is realized, the process is simple, and the effect of saving manpower is achieved.

[0076] S5: Grinding and milling

[0077] The discharge assembly of the concentrator was opened, and the sodium methyl silicate solid was put into the grinder through the discharge assembly. After grinding for 50 minutes, the solid was sieved to obtain sodium methyl silicate powder with a particle size of 120 mesh.

[0078] Example 3

[0079] A production process of sodium methyl silicate powder, such as Figure 1 As shown, the following steps are included:

[0080] S1: Add sodium hydroxide solution to dissolve and react

[0081] Nitrogen is introduced into the reactor to discharge the air in the reactor until the first nitrogen concentration detector in the reactor detects that the nitrogen concentration in the reactor is 95%, the first nitrogen concentration detector sends a signal to the controller, and after the controller receives the signal sent by the first nitrogen concentration detector, it controls the feeding component to add methylsilicic acid into the reactor until the first gravity sensor in the reactor detects that the gravity in the reactor no longer increases, the first gravity sensor sends a signal to the controller, and after the controller receives the signal sent by the first gravity sensor, it controls the hydraulic pump to start, and pumps sodium hydroxide solution into the reactor at a uniform speed through the hydraulic pump, and when the first gravity sensor detects that the gravity in the reactor increases again, the first gravity sensor sends a signal to the controller again, and after the controller receives the signal sent by the first gravity sensor again, it controls the agitator to stir at a rate of 500r / min, and controls the heater to heat to 80°C to react until the liquid solid content detector in the reactor detects that the solid content in the liquid system in the reactor is 15%, the liquid solid content detector sends a signal to the controller, and after the controller receives the signal sent by the liquid solid content detector, it controls the hydraulic pump to close, and after continuing the reaction for 1h, a suspension is obtained;

[0082] S2: Check pH and add reactants

[0083] If the pH detector in the reactor detects that the pH of the suspension prepared in step S1 is less than 6, the pH detector sends a signal to the controller once. After receiving the signal sent by the pH detector once, the controller controls the hydraulic pump to start and continues to add sodium hydroxide solution to the suspension until the pH detector detects that the pH is 6. The pH detector sends a signal to the controller again. After receiving the two signals sent by the pH detector, the controller controls the hydraulic pump to close and the agitator to close, and controls the centrifugal component of the reactor to start, centrifuge the suspension to obtain sodium methyl silicate solution and solid impurities. If the pH detector in the reactor detects that the pH of the suspension is greater than 7, the pH detector sends a signal to the controller three times. After receiving the three signals sent by the pH detector, the controller controls the sprayer in the reactor to start, and sprays methyl silicate into the reactor at a uniform speed through the sprayer until the pH detector reaches 6. When the pH detector detects that pH=6, the pH detector sends a signal to the controller again. After the controller receives four signals sent by the pH detector, it controls the sprayer and the stirrer to be closed, and controls the centrifugal component of the reactor to be opened, and the suspension is centrifuged to obtain a sodium methyl silicate solution and solid impurities. If the pH detector in the reactor detects that the pH of the suspension is 6≤pH≤7, the pH detector sends a signal to the controller five times. After the controller receives five signals sent by the pH detector, it controls the centrifugal component of the reactor to be opened, and the suspension is centrifuged to obtain a sodium methyl silicate solution and solid impurities. First, part of the sodium hydroxide solution is added to react with the methyl silicate, and then the pH is detected to determine whether the reaction is complete. If it is not complete, the reactant is supplemented, thereby reducing the waste of methyl silicate and reducing the sodium hydroxide impurities in the prepared sodium methyl silicate, thereby improving the purity of the sodium methyl silicate powder;

[0084] S3: Introduce nitrogen and exhaust air

[0085] The sodium methyl silicate solution obtained in step S2 passes through the filter membrane and enters the concentrator along the slide pipe. When the second gravity sensor in the concentrator detects that the gravity in the concentrator increases, the second gravity sensor sends a signal to the controller. After receiving the signal sent by the second gravity sensor, the controller controls the air pump to start. The air pump first extracts the hot nitrogen in the reactor after the reaction in step S2 is completed, and then passes the hot nitrogen into the concentrator. The cold air in the concentrator is discharged from the air outlet valve in the concentrator through the hot nitrogen until the second nitrogen concentration detector in the concentrator detects that the nitrogen concentration in the concentrator is 95%. The second nitrogen concentration detector sends a signal to the controller. After receiving the signal sent by the second nitrogen concentration detector, the controller controls the air pump and the air outlet valve to close. Nitrogen is passed into the reactor and the concentrator to exhaust the air in the concentrator to prevent the generated sodium methyl silicate from being decomposed when it encounters water and carbon dioxide.

[0086] S4: Concentrate the sodium methyl silicate solution and dry it

[0087] Subsequently, the controller controls the concentrator to heat to 90°C, and concentrates the sodium methyl silicate solution obtained in step S3 until the liquid level sensor in the concentrator detects that the liquid level of the sodium methyl silicate solution has dropped to 1 / 3 of the original level. The liquid level sensor sends a signal to the controller. After receiving the signal sent by the liquid level sensor, the controller controls the heating temperature of the concentrator to be adjusted to 120°C, and continues heating for 4 hours for drying to obtain solid sodium methyl silicate. Subsequently, the controller controls the concentrator to stop heating, and controls the vacuum valve of the grinder to open, and processes the inside of the grinder into a vacuum environment with a vacuum degree of -0.2MPa. By using the controller to connect sensors and detectors with various machines and equipment, automated production is realized, the process is simple, and the effect of saving manpower is achieved.

[0088] S5: Grinding and milling

[0089] The discharge assembly of the concentrator was opened, and the sodium methyl silicate solid was put into the grinder through the discharge assembly. After grinding for 30 minutes, the solid was sieved to obtain sodium methyl silicate powder with a particle size of 100 mesh.

[0090] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A production process of sodium methyl silicate powder, characterized in that: The steps include: S1: Add sodium hydroxide solution to dissolve and react Adding sodium hydroxide solution to methylsilicic acid, heating and stirring to dissolve, reacting to obtain a suspension; S2: Check pH and add reactants Detect the pH of the suspension, if the pH is less than 6, add sodium hydroxide solution, if the pH is greater than 7, add methylsilicic acid, until the pH is 6 to 7, and then centrifuge to obtain solid impurities of the sodium methylsilicic acid solution; S3: Introduce nitrogen and exhaust air After adding the above sodium methyl silicate solution into the concentrator, nitrogen is introduced into the concentrator until all the air in the concentrator is exhausted; S4: Concentrate the sodium methyl silicate solution and dry it The sodium methyl silicate solution is heated and concentrated to 1 / 3 of the original volume, and then the temperature is adjusted to increase, and the heating is continued and dried to obtain a sodium methyl silicate solid; S5: Grinding and milling The discharge assembly of the concentrator is opened, and the sodium methyl silicate solid is put into the grinder through the discharge assembly. After grinding for 30 to 50 minutes, the sodium methyl silicate powder is sieved to obtain the sodium methyl silicate powder.

2. The production process of a sodium methyl silicate powder according to claim 1, characterized in that: step The step of adding sodium hydroxide solution to dissolve S1 and reacting the solution specifically comprises the following steps: S1.1: nitrogen is introduced into the reactor to discharge the air in the reactor until the first nitrogen concentration detector in the reactor detects that the nitrogen concentration in the reactor is 95-99%, and the first nitrogen concentration detector sends a signal to the controller; S1.2: After receiving the signal sent by the first nitrogen concentration detector, the controller controls the feed assembly to add methylsilicic acid into the reactor until the first gravity sensor in the reactor detects that the gravity in the reactor no longer increases, and the first gravity sensor sends a signal to the controller; S1.3: After receiving the signal sent by the first gravity sensor, the controller controls the hydraulic pump to start, and pumps the sodium hydroxide solution into the reactor at a uniform speed through the hydraulic pump; S1.4: When the first gravity sensor detects that the gravity in the reactor increases again, the first gravity sensor sends a signal to the controller again; S1.5: After receiving the signal sent by the first gravity sensor again, the controller controls the stirrer to stir at a rate of 500-600 r / min, and controls the heater to heat to 80-90° C. to react; S1.6: When the liquid solid content detector in the reactor detects that the solid content in the liquid system in the reactor is 10-15%, the liquid solid content detector sends a signal to the controller; S1.7: After receiving the signal from the liquid solid content detector, the controller controls the hydraulic pump to close and continues the reaction for 1 to 2 hours to obtain a suspension.

3. The production process of a sodium methyl silicate powder according to claim 2, characterized in that: step S2 detects pH and replenishes reactants, specifically including the following steps: S2.1: If the internal pH detector of the reactor detects that the pH of the suspension prepared in step S1.7 is less than 6, The pH detector sends a signal to the controller once; S2.2: After the controller receives the signal sent by the pH detector, it controls the hydraulic pump to start and continue to add sodium hydroxide solution to the suspension until the pH detector detects that pH = 6-7, and the pH detector sends a signal to the controller again; S2.3: After receiving two signals from the pH detector, the controller controls the hydraulic pump and the agitator to be turned off, and controls the centrifugal assembly of the reactor to be turned on, and centrifuges the suspension to obtain a sodium methyl silicate solution and solid impurities; S2.4: If the pH detector in the reactor detects that the pH of the suspension is greater than 7, the pH detector sends three signals to the controller; S2.5: After receiving the three signals sent by the pH detector, the controller controls the sprayer in the reactor to start, and methylsilicic acid is uniformly sprayed into the reactor through the sprayer; S2.6: until the pH detector detects that pH=6-7, the pH detector sends a signal to the controller again; S2.7: after receiving four signals sent by the pH detector, the controller controls the sprayer and the stirrer to be turned off, and controls the centrifugal component of the reactor to be turned on, and centrifuges the suspension to obtain a sodium methyl silicate solution and solid impurities; S2.8: If the pH detector in the reactor detects that the pH of the suspension is 6≤pH≤7, the pH detector sends five signals to the controller; S2.9: After receiving five signals sent by the pH detector, the controller controls the centrifugal component of the reactor to start, and centrifuges the suspension to obtain a sodium methyl silicate solution and solid impurities.

4. The production process of sodium methyl silicate powder according to claim 3, characterized in that: step S3 introduces nitrogen and exhausts air, specifically comprising the following steps: S3.1: The sodium methyl silicate solution obtained in step S2 passes through the filter membrane and enters the concentrator along the slide pipe. When the second gravity sensor in the concentrator detects that the gravity in the concentrator increases, the second gravity sensor sends a signal to the controller; S3.2: After receiving the signal sent by the second gravity sensor, the controller controls the air pump to start, and nitrogen is introduced into the concentrator through the air pump to discharge the air in the concentrator; S3.3: When the second nitrogen concentration detector in the concentrator detects that the nitrogen concentration in the concentrator is 95-99%, the second nitrogen concentration detector sends a signal to the controller; S3.4: After receiving the signal sent by the second nitrogen concentration detector, the controller controls the air pump to turn off.

5. The production process of a sodium methyl silicate powder according to claim 4, characterized in that: step The concentrated sodium methyl silicate solution of S4 is dried, specifically comprising the following steps: S4.1: Subsequently, the controller controls the concentrator to heat to 90-95° C. to concentrate the sodium methyl silicate solution obtained in step S3.1; S4.2: until the liquid level sensor in the concentrator detects that the liquid level of the sodium methyl silicate solution has dropped to 1 / 3 of the original level, the liquid level sensor sends a signal to the controller; S4.3: After receiving the signal sent by the liquid level sensor, the controller controls the heating temperature of the concentrator to be adjusted to 120-135°C, and continues heating for 2-4 hours to dry and obtain sodium methyl silicate solid; S4.4: The controller then controls the concentrator to stop heating and controls the vacuum valve of the grinder to open, so that the inside of the grinder is processed into a vacuum environment.

6. The production process of sodium methyl silicate powder according to claim 4, characterized in that: In step S3.2, after the controller receives the signal sent by the second gravity sensor, it controls the air pump to start. The air pump first extracts the hot nitrogen in the reactor after the reaction is completed, and then passes the hot nitrogen into the concentrator. The cold air in the concentrator is discharged from the outlet valve in the concentrator through the hot nitrogen until the controller receives the signal sent by the second concentration detector. At the same time, the controller controls the air pump to close and also controls the outlet valve to close.

7. The production process of sodium methyl silicate powder according to claim 5, characterized in that: After being processed by the vacuum valve, the vacuum degree in the grinder is -0.5~-0.2MPa.

8. The production process of sodium methyl silicate powder according to claim 1, characterized in that: The particle size of sodium methyl silicate powder is 100-120 mesh.

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