CN214131672U - Preparation facilities of magnesium hydrate thick liquids - Google Patents
Preparation facilities of magnesium hydrate thick liquids Download PDFInfo
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- CN214131672U CN214131672U CN202023036468.6U CN202023036468U CN214131672U CN 214131672 U CN214131672 U CN 214131672U CN 202023036468 U CN202023036468 U CN 202023036468U CN 214131672 U CN214131672 U CN 214131672U
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Abstract
The utility model discloses a preparation facilities of magnesium hydrate thick liquids, this preparation facilities includes compounding jar, storage tank and at least one hydrator, hydrator includes feed inlet, drive arrangement, speed reducer, (mixing) shaft, air pressure control valve, baffle, controller and discharge gate, the feed inlet links to each other with compounding jar, the discharge gate links to each other with the storage tank, drive arrangement links to each other with the speed reducer, the output of speed reducer is connected with the (mixing) shaft, the (mixing) shaft stretches into the inside of hydrator, be equipped with the air pressure control valve that can regulate and control hydrator internal pressure on the hydrator, the baffle is located discharge gate department, the hydrator is equipped with the controller outward, the controller controls the baffle; also comprises a preparation method of the magnesium hydroxide slurry based on the device. The utility model discloses in with the high-speed shearing stirring, improve magnesium hydrate rate by a wide margin, can prepare stable high concentration magnesium hydrate thick liquids fast.
Description
Technical Field
The utility model belongs to the technical field of chemical pulp preparation, especially, relate to a preparation facilities of magnesium hydrate thick liquids.
Background
Magnesium hydroxide has high activity, high adsorption capacity, strong buffering performance, low corrosion and other unique properties, and has abundant material reserves, so that it is widely studied in recent years. The industrial method for obtaining magnesium hydroxide slurry generally includes a magnesium oxide hydration method, a brine precipitation method, a brucite wet grinding method and the like. The brine precipitation method has the problems of low purity, high cost and the like; the brucite wet grinding method is simpler, but the content of the ore in the natural world is less; the most widely used method is the hydration method of magnesium oxide, which uses magnesite as main raw material, and prepares active magnesium oxide through calcination, and then hydrates it to synthesize magnesium hydroxide. At present, the magnesium hydroxide is prepared by adopting a light-burned magnesium oxide hydration mode most commonly, the hydration is generally completed by stirring, the hydration time is 1-24 h, the hydration temperature is 30-60 ℃, and the hydration rate is generally 60-70%. The common process for preparing the magnesium hydroxide by hydrating the magnesium oxide has low hydration rate and long hydration time, and the slurry is easy to precipitate after being placed for a long time, so that the stable high-concentration slurry is difficult to prepare.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the proposition of above problem, and the preparation facilities of a magnesium hydrate thick liquids of research design solve present magnesium hydrate thick liquids preparation hydration rate low, hydration time long, easily deposit, be difficult to obtain high concentration thick liquids scheduling problem. The utility model discloses a technical means as follows:
the utility model provides a preparation facilities of magnesium hydrate thick liquids, includes compounding jar, storage tank and at least one hydrator, the hydrator includes feed inlet, drive arrangement, speed reducer, (mixing) shaft, air pressure control valve, baffle, controller and discharge gate, the feed inlet with the compounding jar links to each other, the discharge gate with the storage tank links to each other, drive arrangement with the speed reducer links to each other, the output of speed reducer with stirring shaft connection, the (mixing) shaft stretches into the inside of hydrator, be equipped with the air pressure control valve that can regulate and control hydrator internal pressure on the hydrator, the baffle is located discharge gate department, the hydrator is equipped with the controller outward, the controller is right the baffle is controlled.
Preferably, a temperature sensor is arranged in the hydrator and connected with the controller.
Preferably, the number of the hydrator is two, the two hydrators are connected in series, the air pressure control valve comprises a pressure sensor and an electromagnetic valve, the driving device is a motor, a delivery pump is arranged between the feeding port and the mixing tank, and the delivery pump is a peristaltic pump.
Preferably, be equipped with stirring paddle leaf on the (mixing) shaft, stirring paddle leaf follows (mixing) shaft circumference is the annular and distributes, forms a plurality of annular rings, and every annular ring includes two at least stirring paddle leaf, stirring paddle leaf slope sets up on the (mixing) shaft, stirring paddle leaf with the axial contained angle of (mixing) shaft is 45-75 degrees, and this contained angle is towards the incoming material direction, stirring shaft length is 3/5 ~ 5/6 of hydrator length, the (mixing) shaft and stirring paddle leaf's overall height is 1/2 ~ 5/6 of hydrator height.
Preferably, the material of stirring shaft and stirring paddle is ceramic or 316 stainless steel.
A preparation method of magnesium hydroxide slurry based on the device comprises the following steps:
s1, mixing light-burned magnesia powder with the particle size of 325-5000 meshes, magnesium-containing water and a dispersing agent to obtain slurry, wherein the light-burned magnesia accounts for 27-60% of the mass of the slurry, and the dispersing agent accounts for 1-5% of the mass of the slurry;
s2, adding the obtained slurry into a hydrator, controlling the pressure in the hydrator to be 0.1-0.5MPa, and stirring and mixing; because the added materials are all at normal temperature, the materials react in the hydrator to release heat, so that the temperature is increased, and the temperature is slowly reduced after the reaction is finished; when the temperature of the slurry is reduced to below 50 ℃, the magnesium hydroxide slurry is obtained.
Preferably, in step S1, the magnesium-containing water includes magnesium-rich water and tap water, and the mass ratio of the magnesium-rich water to the tap water is (0-20): 1, the magnesium-rich water is one or more than two of seawater, concentrated seawater obtained after seawater desalination, sea salt field brine, seawater bromine preparation mother liquor and salt lake brine.
Preferably, in step S1, the dispersant is one or more of monosaccharide, polysaccharide and alcohol.
Preferably, in step S2, the stirring speed is 200-1000 rpm.
Preferably, in step S2, the slurry preparation time is 10-50min and the yield is 0.2-1.2 ton/h.
Compared with the prior art, the preparation device of the magnesium hydroxide slurry has the advantages that: the utility model discloses a motor drives the stirring paddle leaf that the slope staggers and set up, produces the high-speed shearing force of forward propulsion in hydrator cavity, realizes abundant, the even stirring to the slurrying raw materials, can shorten hydration time to 10 ~ 50min from the required 1 ~ 24h of traditional approach, realizes quick slurrying. And magnesium-containing water is used as a hydrating agent and process water, and a large amount of magnesium, sodium and other ions are contained in magnesium-rich water such as seawater, concentrated seawater obtained after seawater desalination, sea salt field brine, seawater bromine preparation mother liquor, salt lake brine and the like, so that magnesium source can be provided while magnesium oxide dissolution is promoted, and the hydration rate of magnesium hydroxide is improved to be more than 80%. Because the magnesium-containing water, the stirring shaft and the stirring blade are adopted for stirring and fully grinding, the solid content of the prepared magnesium hydroxide slurry can reach more than 70 percent, the solid particle size is small, the suspension property is good, and the magnesium hydroxide slurry is not easy to precipitate after being placed for a long time. The utility model discloses a temperature sensor real-time supervision reaction system temperature through pressure sensor and solenoid valve regulation and control hydrator internal pressure, can realize slurrying process automation control, the magnesium hydrate thick liquids stable quality who obtains.
Drawings
Fig. 1 is a schematic view of the overall structure in embodiment 1 of the present invention.
Fig. 2 is a schematic structural view of a stirring shaft in embodiment 1 of the present invention.
Fig. 3 is a schematic view of the overall structure in embodiments 2 and 3 of the present invention.
In the figure, 1, a mixing tank; 2. a hydrator; 3. a material storage tank; 4. a delivery pump; 5. a feed inlet; 6. a drive device; 7. a speed reducer; 8. a stirring shaft; 9. a pneumatic control valve; 10. a baffle plate; 11. a controller; 12. a discharge port; 13. a temperature sensor; 14. stirring paddle.
Detailed Description
Example 1:
as shown in fig. 1-2, a magnesium hydroxide slurry preparation apparatus includes a mixing tank 1, a hydrator 2 and a storage tank 3 connected in sequence, the mixing tank 1 is used for holding and mixing raw materials, the hydrator 2 is a main material reaction site, and the storage tank 3 is used for collecting prepared magnesium hydroxide slurry. The hydrator 2 comprises a feed inlet 5, a driving device 6, a speed reducer 7, a stirring shaft 8, an air pressure control valve 9, a baffle plate 10, a controller 11 and a discharge port 12, wherein the feed inlet 5 of the hydrator 2 is connected with the mixing tank 1 through a pipeline, and the discharge port 12 is connected with the storage tank 3. The driving device 6 selects a motor, the output end of the motor is connected with the speed reducer 7, the output end of the speed reducer 7 is connected with the stirring shaft 8, and the stirring shaft 8 extends into the hydrator 2 to promote the hydration reaction through stirring. The hydrator 2 is provided with an air pressure control valve 9 capable of regulating and controlling the internal pressure of the hydrator 2, and the air pressure control valve 9 comprises a pressure sensor and an electromagnetic valve. The pressure in the hydrator 2 can be monitored through a pressure sensor, and the pressure is adjusted through an electromagnetic valve, so that the requirement of the hydration process is met. The baffle 10 is arranged at the discharge port 12 of the hydrator 2, the controller 11 is arranged outside the hydrator 2, the controller 11 is connected with the baffle 10, and the controller 11 can control the opening and closing of the baffle 10 so as to control the discharge.
A temperature sensor 13 is arranged in the hydrator 2, the temperature sensor 13 is arranged on the inner wall of the hydrator 2 at the upper part of the baffle 10 and is immersed in the slurry when in use, and the temperature sensor 13 is connected with the controller 11. The temperature sensor 13 can monitor the temperature of the slurry in the hydrator 2 in real time and feed the temperature back to the controller 11, and the discharging can be controlled when the temperature reaches a certain value. Through the automatic control, the obtained magnesium hydroxide slurry has stable quality.
The pipeline between the feed inlet 5 and the mixing tank 1 is provided with the delivery pump 4, the peristaltic pump is selected for use as the delivery pump 4, the precision is high, the shearing force is lower, the property of the raw material cannot be damaged, the raw material is pollution-free to the pump body, the maintenance is simple, and no damage can be caused to any part of the pump under the condition of no liquid idle running.
As shown in fig. 2, stirring blades 14 are arranged on the stirring shaft 8, and the stirring blades 14 are annularly distributed along the circumferential direction of the stirring shaft 8 to form a plurality of annular rings, and each annular ring includes at least two stirring blades 14. The stirring shaft 8 and the stirring blades 14 form a spiral stirring paddle, and when the stirring shaft 8 rotates, the material is pushed to move from the left side to the right side in the figure 2. Stirring paddle 14 evenly sets up along the circumference of (mixing) shaft 8, and mutual noninterference guarantees the material misce bene between the adjacent stirring paddle 14. And stirring paddle 14 slope sets up on (mixing) shaft 8, and the axial contained angle a of (mixing) shaft 8 and stirring paddle 14 is 45-75 degrees, and contained angle a faces the supplied materials direction for when (mixing) shaft 8 was rotatory, stirring paddle 14 can fully stir the material in hydrator 2. The length of the stirring shaft 8 is 3/5-5/6 of the total length of the cavity of the hydrator 2, the total height (h in figure 2) of the stirring shaft 8 and the stirring blades 14 accounts for 1/2-5/6 of the total height of the cavity of the hydrator 2, and the initial section of the stirring shaft 8 is located below the feed port 5, so that the material entering from the feed port 5 is in a stirring state at the first time and is conveyed to the discharge port 12 by the stirring shaft 8. The stirring shaft 8 and the stirring blades 14 are made of corrosion-resistant, wear-resistant and high-hardness materials, preferably ceramic and 316 stainless steel, so that the service life is long enough.
A preparation method of high-concentration magnesium hydroxide slurry based on the device comprises the following steps:
(1) adding 500-mesh light-burned magnesia powder, tap water, concentrated seawater obtained by desalting seawater and a polysaccharide dispersant into a mixing tank 1, and uniformly mixing to obtain slurry. Wherein the mass ratio of tap water to concentrated seawater is 1:5, the weight percentage of the light calcined magnesia in the slurry is 40%, and the weight percentage of the polysaccharide dispersant in the aqueous solution is 3%.
(2) And (2) supplying power to the slurry obtained in the step (1) by a peristaltic pump, and adding the slurry into the hydrator 2 through a feed inlet 5. And meanwhile, a rotating motor is started to drive a stirring shaft 8 and a stirring blade 14 to rotate at the speed of 400 revolutions per minute, and the mixed slurry is pushed and stirred in the hydrator 2 to promote the hydration of the magnesium oxide powder to form magnesium hydroxide slurry.
(3) When the volume of the slurry reaches 2/3-3/4 of the volume of the hydrator 2, stopping feeding, ensuring the continuous operation of the motor, and stirring and mixing the slurry. Meanwhile, the pressure in the cavity of the hydrator 2 is controlled to be 0.3MPa through the air pressure control valve 9, and the temperature of the slurry is monitored in real time through the temperature sensor 13.
(4) After 30min, the temperature sensor 13 detects that the temperature of the slurry is reduced to below 50 ℃, the controller 11 sends out an electric signal, the baffle 10 is opened, and the slurry enters the storage tank 3 through the discharge hole 12.
The magnesium hydroxide slurry prepared in example 1 had a solid content of 50%, a hydration rate of 86%, a viscosity of 200cps, a yield of 0.5 ton/h, and no precipitation after standing for 50 days.
Example 2:
as shown in fig. 3, the difference from example 1 is that a magnesium hydroxide slurry preparation apparatus includes two hydrators 2, and the two hydrators 2 are connected in series. Specifically, the mixed material sequentially passes through the first hydrator 2 and the second hydrator 2 along the conveying direction, and the hydration reaction is more thorough through two-stage hydration.
A preparation method of high-concentration magnesium hydroxide slurry based on the device comprises the following steps:
(1) adding 1000-mesh light-burned magnesia powder, tap water, seawater and a monosaccharide dispersant into a mixing tank 1, and uniformly mixing to obtain slurry. Wherein the mass ratio of tap water to seawater is 1:10, the weight percentage of the light-burned magnesia in the slurry is 27%, and the weight percentage of the monosaccharide dispersant in the slurry is 1%.
(2) Adding the slurry obtained in the step (1) into a first hydrator 2 through a peristaltic pump and a feed port 5. And meanwhile, a rotating motor is started to drive the stirring shaft 8 and the stirring blades 14 to rotate at the speed of 300 revolutions per minute, so that the mixed slurry is pushed and stirred, and the hydration of the magnesium oxide powder is promoted to form the magnesium hydroxide slurry.
(3) When the volume of the slurry reaches 2/3-3/4 of the volume of the first hydrator 2, stopping feeding, rotating the motor to continue running, and stirring and mixing the slurry. Meanwhile, the pressure in the cavity of the first hydrator 2 is controlled to be 0MPa through the air pressure control valve 9, and the temperature of the slurry is monitored in real time through the temperature sensor 13.
(4) After 15 minutes, the temperature sensor 13 detects that the slurry temperature has dropped below 100 ℃, the controller 11 sends an electrical signal to open the damper 10 to allow the slurry to pass into the second hydrator 2. And meanwhile, a rotating motor in the second hydrator 2 is started to drive the stirring shaft 8 and the stirring blades 14 to rotate at the speed of 300 revolutions per minute, and the slurry is further stirred under the action of high shear force to promote the hydration of the magnesium oxide. Meanwhile, the second hydrator 2 is controlled to be communicated with the atmosphere, so that the slurry is slowly cooled.
(5) After 10 minutes, the temperature sensor 13 detects that the temperature of the slurry is reduced to below 50 ℃, the controller 11 sends out an electric signal, the baffle 10 is opened, and the slurry enters the storage tank 3 through the discharge hole 12.
The magnesium hydroxide slurry prepared in example 2 had a solid content of 38%, a hydration rate of 97%, a viscosity of 100cps, a yield of 0.7 ton/h, and no precipitation after standing for 60 days.
Example 3:
the difference from the example 2 is that a method for preparing magnesium hydroxide slurry comprises the following steps:
(1) adding 3000-mesh light-burned magnesia powder, tap water, salt lake brine and a monosaccharide dispersant into a mixing tank 1, and uniformly mixing to obtain slurry. Wherein the mass ratio of tap water to salt lake brine is 1:15, the weight percentage of the light calcined magnesia in the slurry is 60%, and the weight percentage of the monosaccharide dispersant in the slurry is 5%.
(2) Adding the slurry obtained in the step (1) into a first hydrator 2 through a peristaltic pump and a feed port 5. And meanwhile, a rotating motor is started to drive the stirring shaft 8 and the stirring blades 14 to rotate at the speed of 500 revolutions per minute, so that the mixed slurry is pushed and stirred, and the hydration of the magnesium oxide powder is promoted to form the magnesium hydroxide slurry.
(3) When the volume of the slurry reaches 2/3-3/4 of the volume of the first hydrator 2, stopping feeding, rotating the motor to continue running, and stirring and mixing the slurry. Meanwhile, the pressure in the cavity of the first hydrator 2 is controlled to be 0.5MPa through the air pressure control valve 9, and the temperature of the slurry is monitored in real time through the temperature sensor 13.
(4) After 30min, the temperature sensor 13 detects that the temperature of the slurry is reduced to be below 100 ℃, the controller 11 sends out an electric signal, and the baffle 10 is opened, so that the slurry enters the second hydrator 2. And meanwhile, a rotating motor in the second hydrator 2 is started to drive the stirring shaft 8 and the stirring blades 14 to rotate at the speed of 300 revolutions per minute, and the slurry is further stirred under the action of high shear force to promote the hydration of the magnesium oxide. Meanwhile, the second hydrator 2 is controlled to be communicated with the atmosphere, so that the slurry is slowly cooled.
(5) After 20min, the temperature sensor 13 detects that the temperature of the slurry is reduced to below 50 ℃, the controller 11 sends out an electric signal, the baffle 10 is opened, and the slurry enters the storage tank 3 through the discharge hole 12.
The magnesium hydroxide slurry prepared in example 3 had a solid content of 72%, a hydration rate of 83%, a viscosity of 300cps, a yield of 0.4 ton/h, and no precipitation after 30 days.
The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
Claims (5)
1. A preparation facilities of magnesium hydrate thick liquids which characterized in that: comprises a mixing tank (1), a storage tank (3) and at least one hydrator (2), wherein the hydrator (2) comprises a feed inlet (5), a driving device (6), a speed reducer (7), a stirring shaft (8), an air pressure control valve (9), a baffle (10), a controller (11) and a discharge port (12), the feed inlet (5) is connected with the mixing tank (1), the discharge port (12) is connected with the storage tank (3), the driving device (6) is connected with the speed reducer (7), the output end of the speed reducer (7) is connected with the stirring shaft (8), the stirring shaft (8) extends into the hydrator (2), the hydrator (2) is provided with an air pressure control valve (9) capable of regulating and controlling the internal pressure of the hydrator (2), and the baffle (10) is arranged at the discharge port (12), a controller (11) is arranged outside the hydrator (2), and the controller (11) controls the baffle (10).
2. The apparatus for preparing a magnesium hydroxide slurry as set forth in claim 1, wherein: a temperature sensor (13) is arranged in the hydrator (2), and the temperature sensor (13) is connected with the controller (11).
3. The apparatus for preparing a magnesium hydroxide slurry as set forth in claim 1, wherein: the number of the hydrator (2) is two, the two hydrators (2) are connected in series, the air pressure control valve (9) comprises a pressure sensor and an electromagnetic valve, the driving device (6) is a motor, a conveying pump (4) is arranged between the feeding hole (5) and the mixing tank (1), and the conveying pump (4) is a peristaltic pump.
4. The apparatus for preparing a magnesium hydroxide slurry as set forth in claim 1, wherein: be equipped with stirring paddle (14) on (mixing) shaft (8), stirring paddle (14) are followed (mixing) shaft (8) circumference is the annular and distributes, forms a plurality of annular rings, and every annular ring includes two at least stirring paddle (14), stirring paddle (14) slope sets up on (mixing) shaft (8), stirring paddle (14) with the axial contained angle of (mixing) shaft (8) is 45-75 degrees, and this contained angle is towards the supplied materials direction, (mixing) shaft (8) length is 3/5 ~ 5/6 of hydrator (2) length, the total height of (mixing) shaft (8) and stirring paddle (14) is 1/2 ~ 5/6 of hydrator (2) height.
5. The apparatus for preparing a magnesium hydroxide slurry as set forth in claim 4, wherein: the stirring shaft (8) and the stirring blades (14) are made of ceramic or 316 stainless steel.
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| CN202023036468.6U CN214131672U (en) | 2020-12-15 | 2020-12-15 | Preparation facilities of magnesium hydrate thick liquids |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112452286A (en) * | 2020-12-15 | 2021-03-09 | 辽宁荣邦科技有限公司 | Preparation device and method of magnesium hydroxide slurry |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112452286A (en) * | 2020-12-15 | 2021-03-09 | 辽宁荣邦科技有限公司 | Preparation device and method of magnesium hydroxide slurry |
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