A low-alkali low-viscosity magnesium silicate preparation process, a preparation device, and a working method of the device

Abstract

The application discloses a low-alkali low-viscosity magnesium silicate preparation process, a preparation device and a working method of the device, and relates to the technical field of magnesium silicate preparation. The low-alkali low-viscosity magnesium silicate preparation process comprises the following steps: S1, respectively configuring aluminum silicate solution and magnesium oxide solution; wherein the aluminum silicate solution is used as a silicon source and a pH regulator in the reaction, and the magnesium oxide solution is used as a magnesium source in the reaction; S2, gradually adding the magnesium oxide solution into the aluminum silicate solution, so that the magnesium oxide solution reacts with the aluminum silicate solution to generate magnesium silicate; and S3, in the reaction process, gradually adding the aluminum silicate solution into the reaction solution according to the pH value of the reaction solution to maintain the pH value range of the reaction, and the pH value range is controlled to be between 8.5 and 10. The application designs a preparation process and a preparation device matched with the preparation process of low-alkali low-viscosity magnesium silicate, and the preparation process combined with the matched preparation device has the advantages of low cost, low energy consumption, good practicability and good market value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of magnesium silicate preparation, and particularly relates to a low-alkali and low-viscosity magnesium silicate preparation process, a preparation device and a working method of the device. BACKGROUND

[0002] Magnesium silicate is an important industrial raw material, and is particularly important in the manufacture of coatings, adhesives and high-performance polymers. Magnesium silicate with different properties has different application scenarios; among them, low alkalinity and low viscosity are a key performance indicator of magnesium silicate, and low alkalinity and low viscosity can improve the stability and handling performance of the product.

[0003] For the preparation of low-alkali and low-viscosity magnesium silicate, the present inventors believe that how to design a preparation process of low-alkali and low-viscosity magnesium silicate and ensure that the preparation process has the advantages of low cost and low energy consumption is a technical problem to be solved by the general technical personnel in the field at present.

[0004] The information disclosed in this BACKGROUND section is only intended to increase an understanding of the general context in which the present application can be practiced. It is not admitted that any of the information provided in this BACKGROUND section constitutes prior art to the present application. SUMMARY

[0005] In view of the above technical problems, the embodiments of the present application provide a low-alkali and low-viscosity magnesium silicate preparation process, a preparation device and a working method of the device to solve the problems raised in the above BACKGROUND.

[0006] The present application provides the following technical solutions:

[0007] A low-alkali and low-viscosity magnesium silicate preparation process comprises the following steps:

[0008] S1, respectively configuring an aluminum silicate solution and a magnesium oxide solution;

[0009] Among them, the aluminum silicate solution serves as a silicon source and a pH regulator in the reaction, and the magnesium oxide solution serves as a magnesium source in the reaction;

[0010] S2, gradually adding the magnesium oxide solution to the aluminum silicate solution, so that the magnesium oxide solution reacts with the aluminum silicate solution to generate magnesium silicate;

[0011] S3, during the reaction, gradually adding the aluminum silicate solution to the reaction solution to maintain the pH value range of the reaction according to the pH value of the reaction solution; the pH value range is controlled to be between 8.5 and 10;

[0012] S4, after the reaction is completed, continuously adding the aluminum silicate solution to the reaction solution to ensure that the aluminum silicate is in an excess state in the reaction solution at the end of the reaction; at the same time, adding a viscosity reducer to the reaction solution;

[0013] S5, after the silicon aluminum in the reaction solution is in an excessive state, filtering the reaction solution and recovering the reaction filtrate; meanwhile, recovering the magnesium silicate removed from the reaction solution.

[0014] A preparation device of low-alkali low-viscosity magnesium silicate; comprising:

[0015] a reaction kettle, a silicon aluminum tank, a nitrogen storage tank and a nitrogen temporary storage tank;

[0016] The first discharge port of the silicon aluminum tank is connected with the silicon aluminum inlet of the reaction kettle through a pipeline; a first feeding valve is connected in series on the pipeline connecting the first discharge port of the silicon aluminum tank with the silicon aluminum inlet of the reaction kettle;

[0017] The heating coil is arranged around the outer peripheral wall of the reaction kettle, and the cross section of the heating coil is rectangular; the hot water inlet of the heating coil is located at one side of the bottom of the reaction kettle, and the hot water outlet of the heating coil is located at one side of the top of the reaction kettle;

[0018] The outer side of the heating coil is surrounded by a heat insulation coil; the cross section of the heat insulation coil is rectangular, and the pipe walls of adjacent heat insulation coils are arranged in close contact;

[0019] The second discharge port of the silicon aluminum tank and the first nitrogen gas outlet of the nitrogen storage tank are connected with the upper straight port and the lower straight port of the first three-way pipe respectively, and the branch port of the first three-way pipe is connected with the inlet of the heat insulation coil;

[0020] A second feeding valve and a pump body are connected in series on the pipeline connecting the second discharge port of the silicon aluminum tank with the upper straight port of the first three-way pipe; a first gas inlet valve is connected in series on the pipeline connecting the first nitrogen gas outlet of the nitrogen storage tank with the lower straight port of the first three-way pipe;

[0021] The first nitrogen gas inlet of the nitrogen temporary storage tank and the outlet of the heat insulation coil are connected with the upper straight port and the lower straight port of the second three-way pipe respectively; the branch port of the second three-way pipe is connected with the spraying pipe arranged in the reaction kettle through a pipeline;

[0022] A second gas inlet valve, a first air pump and a gas flow meter are connected in series on the pipeline connecting the first nitrogen gas inlet of the nitrogen temporary storage tank with the upper straight port of the second three-way pipe; a first liquid outlet valve is connected in series on the pipeline connecting the branch port of the second three-way pipe with the spraying pipe;

[0023] The second nitrogen gas outlet of the nitrogen temporary storage tank is connected with the second nitrogen gas inlet of the nitrogen storage tank through a pipeline; an outlet valve and a second air pump are connected in series on the pipeline connecting the second nitrogen gas outlet of the nitrogen temporary storage tank with the second nitrogen gas inlet of the nitrogen storage tank;

[0024] The outlet at the bottom of the reaction kettle is connected with the upper straight port of the third three-way pipe, the lower straight port of the third three-way pipe is connected with the discharge valve, and the branch port of the third three-way pipe is connected with the liquid inlet of the aluminum silicate tank through a pipeline; a filter valve, a circulating pump body and a liquid return valve are connected in series on the pipeline connecting the branch port of the third three-way pipe with the liquid inlet of the aluminum silicate tank.

[0025] Preferably, the top of the reaction kettle is provided with a liquid inlet and an exhaust valve.

[0026] Preferably, a filter is connected in series on the pipeline connecting the branch port of the third three-way pipe with the liquid inlet of the aluminum silicate tank; the inside of the reaction kettle is provided with a stirrer, a thermometer and a pH sensor; and a sight glass is connected in series on the pipeline connecting the first liquid outlet valve.

[0027] Preferably, a heat insulation jacket is arranged outside the heat insulation coil on the reaction kettle, and the heat insulation jacket is filled with heat insulation material.

[0028] Preferably, the stirrer comprises a main stirring shaft, upper stirring blades, lower stirring blades, scrapers, synchronous gears, driving gears, auxiliary stirring shafts and stirring blades.

[0029] The stirring shaft is located in the reaction kettle and is vertically and rotationally connected to the reaction kettle.

[0030] The upper stirring blades and the lower stirring blades are arranged in an upper-lower interval, the upper stirring blades are fixed to the upper half of the stirring shaft, and the lower stirring blades are fixed to the lower half of the stirring shaft.

[0031] The scrapers comprise two, and the two scrapers are respectively fixedly connected to the end portions of the upper stirring blades and the lower stirring blades on the same side.

[0032] The synchronous gears are fixed to the main stirring shaft, and the synchronous gears are located above the upper stirring blades.

[0033] The auxiliary stirring shafts comprise two, and the two auxiliary stirring shafts are located on both sides of the stirring shaft, the upper and lower ends of the auxiliary stirring shafts are respectively rotationally connected to the upper stirring blades and the lower stirring blades, and the upper end of the auxiliary stirring shaft protrudes outward from the upper stirring blades.

[0034] The driving gears comprise two, and the two driving gears are respectively fixed to the upper ends of the auxiliary stirring shafts; the two driving gears are respectively meshed with the synchronous gears for transmission; and a plurality of groups of stirring blades are arranged on each auxiliary stirring shaft.

[0035] A working method of the low-alkali low-viscosity magnesium silicate preparation device, comprising the following steps:

[0036] S61, respectively configure aluminum silicate solution and magnesium oxide solution, the aluminum silicate solution is stored in the aluminum silicate tank; the magnesium oxide solution is stored through the temporary storage tank; open the first feeding valve, and transport a certain amount of aluminum silicate solution from the aluminum silicate tank to the reaction kettle as a silicon source and a pH regulator in the reaction; then close the first feeding valve.

[0037] S62, the magnesium oxide solution in the temporary storage tank is added to the reaction kettle through the liquid inlet on the reaction kettle for reaction; and hot water is introduced from the hot water inlet of the heating coil to heat the material in the reaction kettle;

[0038] S63, during the reaction, the first liquid outlet valve is closed; the first air inlet valve, the second air inlet valve and the first air pump are opened in sequence, the nitrogen in the nitrogen storage tank enters the heat insulation coil through the inlet of the heat insulation coil, and when the gas flow detected by the gas flow meter on the connecting pipeline between the heat insulation coil and the nitrogen temporary storage tank is stable, it indicates that the heat insulation coil has been filled with nitrogen, then the first air inlet valve, the second air inlet valve and the first air pump are closed;

[0039] S64, during the reaction, according to the pH value of the reaction solution, continue to add aluminum silicate solution to the reaction solution to maintain the normal pH value of the reaction; specifically: open the second feeding valve, the pump body and the first liquid outlet valve in sequence, the aluminum silicate solution in the aluminum silicate tank enters the heat insulation coil from the inlet of the heat insulation coil, the nitrogen in the heat insulation coil is pushed into the reaction kettle, and the nitrogen is introduced into the reaction kettle to prevent oxidation reaction during the reaction;

[0040] At the same time, in the process of gradually adding the aluminum silicate solution in the aluminum silicate tank to the reaction liquid, when the reaction solution reaches the appropriate pH value, the second feeding valve, the pump body and the first liquid outlet valve are closed; and the pressure value in the reaction kettle is observed, if the pressure value is too large, the exhaust valve at the top of the reaction kettle can be opened for exhaust;

[0041] S65, after the pH value adjustment is completed, the first air inlet valve, the second air inlet valve and the first air pump are opened again, the nitrogen in the nitrogen storage tank enters the heat insulation coil through the inlet of the heat insulation coil, and when the gas flow detected by the gas flow meter on the connecting pipeline between the heat insulation coil and the nitrogen temporary storage tank is stable, it indicates that the heat insulation coil has been filled with nitrogen, then the first air inlet valve and the second air inlet valve are closed;

[0042] S66, after the reaction is completed, the second feeding valve, the pump body and the first liquid outlet valve are opened again, the aluminum silicate solution in the aluminum silicate tank is continuously added to the reaction liquid to ensure that the aluminum silicate in the reaction solution is in an excess state at the end of the reaction; at the same time, a viscosity reducer is added to the reaction solution from the liquid inlet at the top of the reaction kettle;

[0043] S67, after the aluminum silicate in the reaction solution is in an excess state, the reaction solution is filtered, the filter valve, the circulating pump body and the liquid return valve are opened; the filtered aluminum silicate solution is recovered and transported to the aluminum silicate tank for storage; then the filter valve, the circulating pump body and the liquid return valve are closed, and the discharge valve is opened to recover the product magnesium silicate;

[0044] S68, the gas outlet valve and the second air pump are opened to recover the nitrogen in the nitrogen temporary storage tank to the nitrogen storage tank for storage.

[0045] The low-alkali low-viscosity magnesium silicate preparation process, preparation device and working method of the device have the following beneficial effects:

[0046] 1. The aluminum silicate solution serves as both a silicon source and a pH regulator, so that the consumption of additional pH regulators is not required, the preparation of low-alkali magnesium silicate is achieved, the raw material cost is reduced, and the production process is simplified;

[0047] 2. The reaction raw materials in the application only need aluminum silicate solution, magnesium oxide solution and viscosity reducer, the types of raw materials are few, the supply chain management is simplified, and thus the procurement cost and inventory management cost are reduced;

[0048] 3. The solution after the reaction is excess aluminum silicate solution, the aluminum silicate solution can be recycled and reused after filtration, the consumption of raw materials is reduced, and the raw material cost is reduced;

[0049] 4. The product magnesium silicate forms suspended solid particles in the reaction solution, the magnesium silicate precipitate usually has a certain adhesion and is adhered to the inner wall of the reaction kettle, if the heating coil is arranged on the inner wall of the reaction kettle, the cleaning of the inner wall of the reaction kettle will be affected; in order to facilitate the cleaning of the inner wall of the reaction kettle, the heating coil is arranged on the outer side of the reaction kettle, and when the subsequent stirrer works, the scraper on the stirrer can conveniently scrape and clean the inner wall of the reaction kettle;

[0050] 5. The heating coil is arranged in a rectangular cross-section structure, when the heating coil is wrapped around the reaction kettle, the rectangular cross-section heating coil can increase the contact area of the heating coil and the reaction kettle and improve the heat exchange efficiency;

[0051] 6. A heat insulation coil is arranged around the outside of the heating coil, one of the functions of the heat insulation coil is heat insulation, so as to avoid the direct contact of the heating coil with the outside air, heat overflow and waste caused by heat overflow; nitrogen gas is filled in the heat insulation coil, the internal convection of the nitrogen gas is low, the heat transfer rate can be reduced, and good heat insulation performance is achieved; and the reaction kettle is provided with a heat insulation jacket outside the heat insulation coil, and the heat insulation jacket is filled with heat insulation material; heat overflow is further reduced;

[0052] 7. In order to smoothly send the nitrogen gas in the nitrogen gas storage tank to the heating coil, a nitrogen gas temporary storage tank is additionally arranged as a pressure balance tank, the nitrogen gas temporary storage tank is in an unfilled nitrogen gas state or a negative pressure state, and the nitrogen gas in the nitrogen gas storage tank can flow from the nitrogen gas storage tank to the nitrogen gas temporary storage tank by means of the high-pressure environment in the tank body and the cooperation of the first air pump;

[0053] 8. When the aluminum silicate solution is added to the reaction solution to adjust the pH value range of the reaction, the nitrogen gas in the heat insulation coil can be emptied, and the heat insulation coil is used as a delivery pipe and a preheating pipe for the aluminum silicate solution, so that the aluminum silicate solution is preheated by the heat in the heat insulation coil, the heat energy utilization rate is improved, and the equipment cost is reduced without the need to separately add preheating equipment to the aluminum silicate tank; and the emptied nitrogen gas in the heat insulation coil is discharged into the reaction kettle and can be used as a protective gas for the reaction;

[0054] 9. The cross section of the heat insulation coil is designed as a rectangle, so that when the heat insulation coil is used as a delivery pipe and a preheating pipe for the aluminum silicate solution, the heat insulation coil and the heating coil can better perform surface contact, and the heat exchange efficiency is improved; and the pipe walls of adjacent heat insulation coils are arranged in close contact to form a nearly complete shielding surface, and better heat insulation can be achieved;

[0055] 10. After the reaction is completed, not only the aluminum silicate solution can be recycled, but the nitrogen gas recycling system is additionally provided, and the nitrogen gas in the nitrogen gas temporary storage tank is pushed back to the nitrogen gas storage tank by the second air pump, so that the utilization rate of the nitrogen gas is improved and the reaction cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0056] Figure 1 It is a structural schematic view of the low-alkali and low-viscosity magnesium silicate preparation device in the present application;

[0057] Figure 2 It is a structural schematic view of the angle one of the connection between the heating coil and the heat insulation coil in the present application;

[0058] Figure 3 It is a structural schematic view of the angle two of the connection between the heating coil and the heat insulation coil in the present application;

[0059] Figure 4 It is a structural schematic view of the angle one of the stirrer in the present application;

[0060] Figure 5 It is a structural schematic view of the angle two of the stirrer in the present application. DETAILED DESCRIPTION

[0061] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0062] In view of the problems mentioned in the above background art, the embodiments of the present application provide a low-alkali and low-viscosity magnesium silicate preparation process, a preparation device, and a working method of the device to solve the above technical problems, and the technical solutions are as follows:

[0063] Embodiment one.

[0064] A low-alkali low-viscosity magnesium silicate preparation process comprises:

[0065] S1, respectively configure aluminum silicate solution and magnesium oxide solution;

[0066] Among them, the aluminum silicate solution is used as the silicon source and pH regulator in the reaction, and the magnesium oxide solution is used as the magnesium source in the reaction;

[0067] S2, gradually add the magnesium oxide solution to the aluminum silicate solution, and the magnesium oxide solution reacts with the aluminum silicate solution to generate magnesium silicate;

[0068] S3, during the reaction, according to the pH value of the reaction solution, gradually add the aluminum silicate solution to the reaction solution to maintain the pH value range of the reaction; the pH value range is controlled between 8.5-10;

[0069] S4, after the reaction is completed, continue to add the aluminum silicate solution to the reaction solution to ensure that the aluminum silicate is in an excess state at the end of the reaction; at the same time, add a viscosity reducer to the reaction solution;

[0070] S5, after the aluminum silicate in the reaction solution is in an excess state, filter the reaction solution and recover the reaction filtrate; at the same time, recover the magnesium silicate removed from the reaction solution.

[0071] The low-alkali low-viscosity magnesium silicate preparation process designed by the application has the following technical advantages:

[0072] 1. The aluminum silicate solution is used as both the silicon source and the pH regulator, without the need to additionally increase the consumption of the pH regulator, and the preparation of low-alkali magnesium silicate is realized, reducing the raw material cost and simplifying the production process;

[0073] 2. The reaction raw materials in the application only need aluminum silicate solution, magnesium oxide solution and viscosity reducer, the types of raw materials are few, the supply chain management is simplified, and thus the procurement cost and inventory management cost are reduced;

[0074] 3. The solution after the reaction is excess aluminum silicate solution, which can be recovered and reused after filtration, reducing the consumption of raw materials and the raw material cost.

[0075] Embodiment two, see Figures 1-5 .

[0076] A low-alkali low-viscosity magnesium silicate preparation device comprises:

[0077] A reaction kettle 1, an aluminum silicate tank 2, a nitrogen storage tank 3 and a nitrogen temporary storage tank 4;

[0078] The first discharge port of the aluminum silicate tank 2 is connected with the aluminum silicate inlet of the reaction kettle 1 through a pipeline; the pipeline, in which the first discharge port of the aluminum silicate tank 2 is connected with the aluminum silicate inlet of the reaction kettle 1, is serially connected with the first feeding valve 7;

[0079] The heating coil 1-2 is arranged around the outer peripheral wall of the reaction kettle 1, and the cross section of the heating coil 1-2 is rectangular; the hot water inlet of the heating coil 1-2 is located at one side of the bottom of the reaction kettle 1, and the hot water outlet of the heating coil 1-2 is located at one side of the top of the reaction kettle 1;

[0080] The hot water inlet valve 12 is arranged on the hot water inlet of the heating coil 1-2, and the hot water outlet valve 16 is arranged on the hot water outlet of the heating coil 1-2;

[0081] The heat insulation coil 1-3 is arranged around the outside of the heating coil 1-2; the cross section of the heat insulation coil 1-3 is rectangular, and the pipe walls of adjacent heat insulation coils are arranged in close contact;

[0082] The second discharge port of the aluminum silicate tank 2 and the first nitrogen gas outlet port of the nitrogen gas storage tank 3 are respectively connected with the upper straight port and the lower straight port of the first three-way pipe 10, and the branch port of the first three-way pipe 10 is connected with the inlet of the heat insulation coil 1-3;

[0083] The second discharge port of the aluminum silicate tank 2 and the upper straight port of the first three-way pipe 10 are serially connected with the second feeding valve 8 and the pump body 9 through a pipeline; the first nitrogen gas outlet port of the nitrogen gas storage tank 3 and the lower straight port of the first three-way pipe 10 are serially connected with the first gas inlet valve 11 through a pipeline;

[0084] The first nitrogen gas inlet port of the nitrogen gas temporary storage tank 4 and the outlet of the heat insulation coil 1-3 are respectively connected with the upper straight port and the lower straight port of the second three-way pipe 26; the branch port of the second three-way pipe 26 is connected with the spraying pipe 18 arranged in the reaction kettle 1 through a pipeline;

[0085] The first nitrogen gas inlet port of the nitrogen gas temporary storage tank 4 and the upper straight port of the second three-way pipe 26 are serially connected with the second gas inlet valve 14, the first air pump 15 and a gas flow meter (not shown in the figure) through a pipeline; the branch port of the second three-way pipe 26 and the spraying pipe 18 are serially connected with the first liquid outlet valve 17 through a pipeline;

[0086] The second nitrogen gas outlet port of the nitrogen gas temporary storage tank 4 is connected with the second nitrogen gas inlet port of the nitrogen gas storage tank 3 through a pipeline, and the second nitrogen gas outlet port of the nitrogen gas temporary storage tank 4 and the second nitrogen gas inlet port of the nitrogen gas storage tank 3 are serially connected with the gas outlet valve 29 and the second air pump 19 through a pipeline;

[0087] The outlet at the bottom of the reaction kettle 1 is connected with the upper straight port of the third three-way pipe 22, the lower straight port of the third three-way pipe 22 is connected with the discharge valve 20, and the branch port of the third three-way pipe 22 is connected with the liquid inlet of the aluminum silicate tank 2 through a pipeline; the pipeline, in which the branch port of the third three-way pipe 22 is connected with the liquid inlet of the aluminum silicate tank 2, is connected with the filter valve 21, the circulating pump body 23 and the liquid return valve 25 in sequence.

[0088] The top of the reaction kettle 1 is provided with a liquid inlet 1a and an exhaust valve.

[0089] In this embodiment, the pipeline, in which the branch port of the third three-way pipe 22 is connected with the liquid inlet of the aluminum silicate tank 2, is connected with the filter 27 in sequence; the reaction kettle 1 is internally provided with a stirrer 5, a thermometer 6 and a pH sensor; the pipeline, in which the first liquid outlet valve 17 is connected in sequence, is connected with the sight glass 13; the sight glass 13 can be used to observe whether the aluminum silicate solution enters the reaction kettle 1.

[0090] In this embodiment, the reaction kettle 1 is provided with a heat insulation jacket 1-1 outside the heat insulation coil 1-3, and the heat insulation jacket 1-1 is filled with heat insulation materials.

[0091] The low-alkali and low-viscosity magnesium silicate preparation device has the following technical advantages when preparing magnesium silicate:

[0092] 1. The product magnesium silicate will form suspended solid particles in the reaction solution, and the magnesium silicate precipitate usually has a certain adhesion and will adhere to the inner wall of the reaction kettle 1. If the heating coil 1-2 is arranged on the inner wall of the reaction kettle 1, it will affect the cleaning of the inner wall of the reaction kettle 1. In order to facilitate the cleaning of the inner wall of the reaction kettle 1, the heating coil 1-2 is arranged on the outer side of the reaction kettle 1. When the subsequent stirrer 5 works, the scraper 5-4 on the stirrer 5 can be used to conveniently scrape and clean the inner wall of the reaction kettle 1.

[0093] 2. The heating coil 1-2 is arranged in a rectangular cross-section structure. When the heating coil 1-2 is arranged around the reaction kettle 1, the heating coil 1-2 with a rectangular cross-section can increase the contact area between the heating coil 1-2 and the reaction kettle 1, thereby improving the heat exchange efficiency.

[0094] 3. The heat insulation coil 1-3 is arranged around the outside of the heating coil 1-2. One of the functions of the heat insulation coil 1-3 is to perform heat insulation, so as to avoid the heating coil 1-2 directly contacting the external air to cause heat overflow and waste. Nitrogen gas is filled in the heat insulation coil 1-3. The nitrogen gas has a relatively low convection motion inside, which can reduce the heat transmission rate and has good heat insulation performance. In addition, the reaction kettle 1 is provided with the heat insulation jacket 1-1 outside the heat insulation coil 1-3, and the heat insulation jacket 1-1 is filled with heat insulation materials; further reducing heat overflow.

[0095] 4. In order to smoothly send the nitrogen in the nitrogen storage tank 3 to the heating coil 1-2, a nitrogen temporary storage tank 4 is additionally arranged as a pressure balance tank, the nitrogen temporary storage tank 4 is in an unfilled nitrogen state or a negative pressure state at ordinary times, and the nitrogen in the nitrogen storage tank 3 can flow from the nitrogen storage tank 3 to the nitrogen temporary storage tank 4 smoothly by means of the high-pressure environment in the tank body and in cooperation with the first air pump 15;

[0096] 5. When the aluminum silicate solution is added to the reaction solution to adjust the pH value range of the reaction, the nitrogen in the heat insulation coil 1-3 can be exhausted, and the heat insulation coil 1-3 is used as a delivery pipe and a preheating pipe of the aluminum silicate solution, the heat insulation coil 1-3 is used to preheat the aluminum silicate solution by means of the heat in the heat insulation coil 1-3, thereby improving the heat energy utilization rate, and the preheating equipment for the aluminum silicate tank 2 is not needed, thereby reducing the equipment cost; and the exhausted nitrogen in the heat insulation coil 1-3 is discharged into the reaction kettle 1 and can be used as the protective gas for the reaction;

[0097] It should be noted that if the unpreheated aluminum silicate solution is directly added to the reaction kettle 1, the overall temperature of the reaction liquid may be reduced, thereby affecting the reaction rate or causing the reaction to stop, and further affecting the yield and quality of the product; meanwhile, if the temperature of the added aluminum silicate solution is low, the local heat in the reaction liquid may be released, thereby causing the temperature to rise or the pressure in the reaction kettle to increase, and further causing a safety hazard;

[0098] 6. The cross section of the heat insulation coil 1-3 is designed as a rectangle, so that when the heat insulation coil 1-3 is used as a delivery pipe and a preheating pipe of the aluminum silicate solution, the heat insulation coil 1-3 can better contact the heating coil 1-2 in surface, thereby improving the heat exchange efficiency; and the adjacent pipe walls of the heat insulation coil are arranged in abutment, thereby forming a nearly complete shielding surface and better insulating;

[0099] 7. After the reaction is completed, not only the aluminum silicate solution can be recycled, but also the nitrogen recovery system is additionally arranged, the nitrogen in the nitrogen temporary storage tank 4 is pushed back to the nitrogen storage tank 3 by the second air pump 19, thereby improving the utilization rate of the nitrogen and reducing the reaction cost.

[0100] In the embodiment, the stirrer 5 includes a main stirring shaft 5-1, upper stirring blades 5-2, lower stirring blades 5-3, scrapers 5-4, synchronous gears 5-5, driving gears 5-6, auxiliary stirring shafts 5-7, and stirring blades 5-9;

[0101] The stirring shaft 5-1 is located in the reaction kettle 1 and is vertically and rotationally connected to the reaction kettle 1;

[0102] The upper stirring blades 5-2 and the lower stirring blades 5-3 are arranged in an upper and lower interval, the upper stirring blades 5-2 are fixed to the upper half of the stirring shaft 5-1, and the lower stirring blades 5-3 are fixed to the lower half of the stirring shaft 5-1;

[0103] The scraper 5-4 includes two, two scrapers 5-4 are fixedly connected to the same side of the upper stirring blade 5-2 and the lower stirring blade 5-3, respectively;

[0104] The synchronous gear 5-5 is fixed on the main stirring shaft 5-1, and the synchronous gear 5-5 is located above the upper stirring blade 5-2;

[0105] The auxiliary stirring shaft 5-7 includes two, two auxiliary stirring shafts 5-7 are located on both sides of the stirring shaft 5-1, and the upper and lower ends of the auxiliary stirring shaft 5-7 are rotatably connected to the upper stirring blade 5-2 and the lower stirring blade 5-3, respectively, and the upper end of the auxiliary stirring shaft 5-7 protrudes outward from the upper stirring blade 5-2;

[0106] The drive gear 5-6 includes two, two drive gears 5-6 are fixed on the upper end of the auxiliary stirring shaft 5-7, respectively; the two drive gears 5-6 are in meshing transmission with the synchronous gear 5-5, respectively; and a plurality of groups of stirring blades 5-9 are arranged on each auxiliary stirring shaft 5-7.

[0107] When the aluminum silicate solution is added to the reaction solution to adjust the pH value range of the reaction, in order to ensure the normal reaction of the reaction, the aluminum silicate solution needs to be quickly and uniformly mixed in the reaction liquid, the upper and lower stirring blades 5-2 and 5-3 can stir the upper and lower layers of the reaction liquid, the two side scrapers 5-4 can not only stir the left and right sides of the reaction liquid, but also can clean and scrape the magnesium silicate adhering to the inner wall of the reaction kettle 1, the two auxiliary stirring shafts 5-7 and the plurality of groups of stirring blades 5-9 increase the number and mixing intensity of the stirring blades in the conventional stirrer, and can improve the mixing capacity of the reaction liquid and the multi-directional mixing of the reaction materials.

[0108] Example three, refer to Figures 1-5 .

[0109] A working method of a low-alkali low-viscosity magnesium silicate preparation device, comprising the following steps:

[0110] S61, respectively configure aluminum silicate solution and magnesium oxide solution, the aluminum silicate solution is stored in the aluminum silicate tank 2; the magnesium oxide solution is stored through the temporary storage tank; open the first feeding valve 7, and transport a certain amount of aluminum silicate solution from the aluminum silicate tank 2 to the reaction kettle 1 as a silicon source and a pH regulator in the reaction; then close the first feeding valve 7;

[0111] S62, the magnesium oxide solution in the temporary storage tank is added to the reaction kettle 1 through the liquid inlet 1a on the reaction kettle 1 for reaction; and hot water is introduced into the hot water inlet of the heating coil 1-2 to heat the materials in the reaction kettle 1;

[0112] S63, during the reaction, the first liquid outlet valve 17 is closed; the first air inlet valve 11, the second air inlet valve 14 and the first air pump 15 are opened in sequence (the purpose of opening the first air inlet valve 11, the second air inlet valve 14 and the first air pump 15 is to form a path among the nitrogen storage tank 3, the heat insulation coil 1-3 and the nitrogen temporary storage tank 4); the nitrogen in the nitrogen storage tank 3 enters the heat insulation coil 1-3 through the inlet of the heat insulation coil 1-3; when the gas flow in the connecting pipeline between the heat insulation coil 1-3 and the nitrogen temporary storage tank 4 is stable, it is indicated that the heat insulation coil 1-3 is filled with nitrogen, and then the first air inlet valve 11 and the second air inlet valve 14 are closed;

[0113] S64, during the reaction, according to the pH value of the reaction solution, the aluminum silicate solution is continuously added into the reaction solution to maintain the normal reaction pH value; specifically, the second feeding valve 8, the pump body 9 and the first liquid outlet valve 17 are opened in sequence (the purpose of opening the second feeding valve 8, the pump body 9 and the first liquid outlet valve 17 is to form a path among the aluminum silicate tank 2, the heat insulation coil 1-3 and the spray pipe 18); the aluminum silicate solution in the aluminum silicate tank 2 enters the heat insulation coil 1-3 through the inlet of the heat insulation coil 1-3; the nitrogen in the heat insulation coil 1-3 is pushed into the reaction kettle 1 through the spray pipe 18, and the nitrogen introduced into the reaction kettle 1 can prevent oxidation reaction during the reaction;

[0114] At the same time, during the process of gradually adding the aluminum silicate solution in the aluminum silicate tank 2 into the reaction solution, when the reaction solution reaches a suitable pH value, the second feeding valve 8, the pump body 9 and the first liquid outlet valve 17 are closed; and the pressure value in the reaction kettle 1 is observed, and if the pressure value is too large, the exhaust valve at the top of the reaction kettle can be opened to exhaust;

[0115] S65, after the pH value adjustment is completed, the first air inlet valve 11, the second air inlet valve 14 and the first air pump 15 are opened again; the nitrogen in the nitrogen storage tank 3 enters the heat insulation coil 1-3 through the inlet of the heat insulation coil 1-3; when the gas flow in the connecting pipeline between the heat insulation coil 1-3 and the nitrogen temporary storage tank 4 is stable, it is indicated that the heat insulation coil 1-3 is filled with nitrogen, and then the first air inlet valve 11 and the second air inlet valve 14 are closed;

[0116] S66, after the reaction is completed, the second feeding valve 8, the pump body 9 and the first liquid outlet valve 17 are opened again, the aluminum silicate solution in the aluminum silicate tank 2 is continuously added into the reaction solution, and the aluminum silicate in the reaction solution is in an excessive state when the reaction is completed; at the same time, a viscosity reducer is added into the reaction solution from the liquid inlet 1a at the top of the reaction kettle 1;

[0117] S67, after the aluminum silicate in the reaction solution is in an excessive state, filtering the reaction solution, opening the filter valve 21, the circulating pump body 23, and the liquid return valve 25 (the purpose of opening the filter valve 21, the circulating pump body 23, and the liquid return valve 25 is to form a path between the reaction kettle 1 and the aluminum silicate tank 2); recycling and conveying the filtered aluminum silicate solution to the aluminum silicate tank 2 for storage; then closing the filter valve 21, the circulating pump body 23, and the liquid return valve 25, opening the discharge valve 20, and recycling the product magnesium silicate;

[0118] S68, opening the air outlet valve 29 and the second air pump 19, recycling the nitrogen in the nitrogen temporary storage tank 4 to the nitrogen storage tank 3 for storage.

[0119] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separated, and the components displayed as units can or can not be physical units, which can be located in one place or distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0120] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "fixing", "threading", and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrated; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of elements or the interaction relationship between elements, unless otherwise explicitly limited, and the above-mentioned terms in the present application can be understood according to the specific meaning in the present application by those skilled in the art.

[0121] It can be understood that, for those skilled in the art, equivalent replacements or changes can be made according to the technical solutions and the concept of the present application, and all these changes or replacements shall belong to the protection scope of the claims attached to the present application.

Claims

1. A process for the preparation of low-alkali low-viscosity magnesium silicate, characterized in that, The method comprises the following steps: S1, respectively configuring aluminum silicate solution and magnesium oxide solution; Wherein, the aluminum silicate solution is used as the silicon source and pH regulator in the reaction, and the magnesium oxide solution is used as the magnesium source in the reaction; S2, gradually adding the magnesium oxide solution into the aluminum silicate solution, and the magnesium oxide solution reacts with the aluminum silicate solution to generate magnesium silicate; S3, during the reaction, according to the pH value of the reaction solution, gradually adding the aluminum silicate solution into the reaction solution to maintain the pH value range of the reaction; the pH value range is controlled between 8.5-10; S4, after the reaction is completed, continuously adding the aluminum silicate solution into the reaction solution to ensure that the aluminum silicate is in an excess state in the reaction solution at the end of the reaction; at the same time, adding a viscosity reducer into the reaction solution; S5, after the aluminum silicate in the reaction solution is in an excess state, filtering the reaction solution and recovering the reaction filtrate; at the same time, recovering the magnesium silicate removed from the reaction solution.

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