CN114735728A - Preparation method and application of magnesium hydroxide - Google Patents
Preparation method and application of magnesium hydroxide Download PDFInfo
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- CN114735728A CN114735728A CN202210407313.3A CN202210407313A CN114735728A CN 114735728 A CN114735728 A CN 114735728A CN 202210407313 A CN202210407313 A CN 202210407313A CN 114735728 A CN114735728 A CN 114735728A
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- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 title claims abstract description 46
- 239000000347 magnesium hydroxide Substances 0.000 title claims abstract description 46
- 229910001862 magnesium hydroxide Inorganic materials 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 87
- 238000001914 filtration Methods 0.000 claims abstract description 59
- 239000000243 solution Substances 0.000 claims abstract description 56
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 48
- 239000013078 crystal Substances 0.000 claims abstract description 39
- 238000003756 stirring Methods 0.000 claims abstract description 26
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims abstract description 24
- 235000019341 magnesium sulphate Nutrition 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000005406 washing Methods 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 10
- 238000002425 crystallisation Methods 0.000 claims abstract description 9
- 230000008025 crystallization Effects 0.000 claims abstract description 9
- 239000007864 aqueous solution Substances 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 230000002572 peristaltic effect Effects 0.000 claims abstract description 5
- 238000005303 weighing Methods 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims description 8
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 claims description 8
- 229960001545 hydrotalcite Drugs 0.000 claims description 8
- 229910001701 hydrotalcite Inorganic materials 0.000 claims description 8
- 239000003818 cinder Substances 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 10
- 238000007790 scraping Methods 0.000 description 8
- 239000002893 slag Substances 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/14—Magnesium hydroxide
- C01F5/22—Magnesium hydroxide from magnesium compounds with alkali hydroxides or alkaline- earth oxides or hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
- B01J19/20—Stationary reactors having moving elements inside in the form of helices, e.g. screw reactors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/001—Feed or outlet devices as such, e.g. feeding tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/008—Feed or outlet control devices
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
- C01P2004/32—Spheres
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a preparation method and application of magnesium hydroxide, which comprises the following steps: s1: weighing sodium hydroxide and magnesium sulfate, and preparing the sodium hydroxide and the magnesium sulfate into aqueous solution; s2: adding water into the reaction container, controlling the temperature of the reaction container, driving a stirring device to stir, and then heating to 90 ℃; s3: adding magnesium hydroxide crystals, S4: dropwise adding the prepared sodium hydroxide solution into the reaction container, and adjusting the pH of the solution in the reaction container to 9.4-9.8; s5: driving a peristaltic pump to add the prepared sodium hydroxide and magnesium sulfate solution into the reactor, and keeping the temperature for 1h at 90 ℃ after the solution is added; s6: filtering under reduced pressure, washing and drying; the magnesium hydroxide prepared by the step is more beneficial to magnesium hydroxide crystallization by controlling the pH value of the process and a seed crystal adding method, successfully prepares a large-particle spherical magnesium hydroxide product with D50 of about 20um, and breaks through the technical bottleneck that large-particle spherical magnesium hydroxide is a technical bottleneck.
Description
Technical Field
The invention belongs to the technical field of chemical agent preparation, and particularly relates to a preparation method and application of magnesium hydroxide.
Background
The large-particle magnesium hydroxide product with the particle size of about 20 microns is prepared and used as a reaction crystallization raw material of the hydrotalcite, so that the filtering efficiency of the preparation process of the magnesium hydroxide and the preparation process of the hydrotalcite is poor, and the infrared purity of the product is expected to be qualified.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a preparation method and application of magnesium hydroxide.
The technical scheme adopted by the invention is as follows:
a preparation method of magnesium hydroxide comprises the following steps:
s1: weighing sodium hydroxide and magnesium sulfate, and preparing the sodium hydroxide and the magnesium sulfate into aqueous solution;
s2: adding water into the reaction container, controlling the temperature of the reaction container, driving a stirring device to stir, and then heating to 90 ℃;
s3: adding magnesium hydroxide crystal, and stirring at 90 deg.C for 10 min;
s4: dropwise adding the prepared sodium hydroxide solution into the reaction container, and adjusting the pH of the solution in the reaction container to 9.4-9.8;
s5: driving a peristaltic pump to add the prepared sodium hydroxide and magnesium sulfate solution into the reactor, controlling the pH value in the reaction container to be maintained between 9.4 and 9.8, and preserving the temperature for 1h at 90 ℃ after the solution is added;
s6: naturally cooling to 40 ℃, filtering under reduced pressure, washing the obtained crystal with water at 40 ℃ for multiple times, and drying by blowing at 60 ℃ for 20 hours.
Preferably, the stirring speed of the stirring device in step S2 is set to 180 rpm.
Preferably, the magnesium hydroxide crystals added in step S3 have an average particle size of between 11 and 16 microns.
Preferably, the sodium hydroxide solution and the magnesium sulfate solution prepared in the step S5 are added dropwise within 3 h; in step S5, if the sodium hydroxide and magnesium sulfate solutions are not added simultaneously, the remaining amount of one solution does not need to be added to the reactor when the other solution is added.
Preferably, in step S2 the reaction vessel includes the reaction box, the outside equidistance fixedly connected with supporting leg of reaction box, the both sides of reaction box all are provided with row cinder notch, every equal movable mounting has sealed lid on arranging the cinder notch, the lower extreme of reaction box is provided with the leakage fluid dram, install the ooff valve on the leakage fluid dram, the top of reaction box sets up the inlet, the inboard middle part fixedly connected with fixed ring gear of reaction box, send out hard anterior segment fixedly connected with motor power, motor power' S output shaft extends to the inside of reaction box and at its terminal fixedly connected with fixed ring gear.
Preferably, in step S2, the stirring device includes a rotating mechanism rotatably connected inside the reaction box and a filtering mechanism disposed at the bottom of the reaction box, and a scraping mechanism is disposed between the rotating mechanism and the filtering mechanism.
Preferably, slewing mechanism is including rotating the connection and being in the inside rotating support of reaction box, rotating support upper portion fixedly connected with rotates the ring gear, it is connected with the running gear to rotate on the rotating support, on the running gear with meshing connection between the fixed ring gear, rotate the ring gear with transmission connection between the power gear.
Preferably, filtering mechanism includes the filtration support, it has the elasticity filter screen to filter the shelf location, filter the middle part of support with be provided with between the rotation support and filter the telescopic link, the lower extreme fixed connection that filters the telescopic link is in on the filtration support, the upper end of filtering the telescopic link is rotated and is connected on the rotation support, it is connected with the filtration solid fixed ring to rotate on the filtration telescopic link.
Preferably, scraper mechanism includes the scraper blade swing arm, the both ends of scraper blade swing arm are all rotated and are connected with the scraper blade support, one of them the scraper blade support rotate to be connected filter solid fixed ring is last, another scraper blade support sliding connection be in rotating the slotted hole on the support, the one end of scraper blade swing arm with connect through the universal joint transmission between the running gear.
The magnesium hydroxide is used as a reaction crystallization raw material of the hydrotalcite, can improve the poor filtration efficiency in the preparation process of the magnesium hydroxide and the preparation process of the hydrotalcite, and improves the infrared purity of the product to be qualified.
The invention has the beneficial effects that:
1. the magnesium hydroxide prepared by the step is more beneficial to magnesium hydroxide crystallization by controlling the pH value of the process and a seed crystal adding method, successfully prepares a large-particle spherical magnesium hydroxide product with D50 of about 20um, and breaks through the technical bottleneck that large-particle spherical magnesium hydroxide is a technical bottleneck.
2. The reaction device can utilize the page height difference of the solutions on the two sides when the sodium hydroxide solution and the magnesium sulfate solution cannot be added at the same time, and stop the solution on the other side after the solution on one side is added, so that the adding proportion between the solutions can be effectively controlled, and the influence of excessive adding of one solution on the crystallization of the magnesium hydroxide is avoided.
3. This reaction unit rotates through rotating bracket in reaction box inside, and rotating bracket drives scraper mechanism and rotates through the meshing that makes between its running gear and the fixed ring gear at the pivoted in-process, and then can stir at the in-process of washing crystal, will concentrate on the crystal at elastic filter screen middle part to removing all around, makes the better even of its distribution, and the cooperation washing liquid carries out comprehensive clearance to the crystal.
4. This reaction unit is through setting up the filtration telescopic link between filtering support and rotating support, and it drives to filter and the elasticity filter screen will take place deformation to carry out the shrink after having washed the crystal, makes it be in the horizontality completely, and the continuous rotation of cooperation scraper blade mechanism can promote gained crystal to filtering support edge removal, under scraper blade mechanism circumferential direction's in the reaction box the condition for the crystal is at the row cinder notch discharge.
Drawings
The invention is described in further detail below with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic view of the overall axial side construction of the present invention;
FIG. 2 is a schematic view of the overall front side structure of the present invention;
FIG. 3 is a schematic view of the structure of a reaction vessel of the present invention;
FIG. 4 is a schematic view of the rotating mechanism and the filtering mechanism of the present invention;
fig. 5 is a schematic view of the scraper mechanism of the present invention.
In the figure: 1-reaction container, 101-reaction box body, 102-slag discharge port, 103-sealing cover, 104-liquid discharge port, 105-switch valve, 106-liquid inlet, 107-power motor, 108-power gear, 109-fixed gear ring, 6-rotating mechanism, 601-rotating bracket, 602-rotating gear ring, 603-rotating gear, 7-filtering mechanism, 701-filtering bracket, 702-elastic filter screen, 703-filtering telescopic rod, 704-filtering fixed ring, 8-scraping plate mechanism, 801-scraping plate rotary rod, 802-scraping plate bracket and 803-universal joint.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
The following describes an embodiment of the present invention, a method for preparing magnesium hydroxide and its application, with reference to fig. 1 to 5, wherein the method for preparing magnesium hydroxide comprises the following steps:
s1: weighing sodium hydroxide and magnesium sulfate, and preparing the sodium hydroxide and the magnesium sulfate into aqueous solution;
s2: adding water into the reaction container 1, controlling the temperature of the water, driving a stirring device to stir, and then heating to 90 ℃; the stirring speed of the stirring device is set to 180 rpm;
s3: adding magnesium hydroxide crystal, and stirring at 90 deg.C for 10 min; the added magnesium hydroxide crystals have an average particle size of between 11 and 16 microns;
s4: dropwise adding the prepared sodium hydroxide solution into the reaction container 1, and adjusting the pH of the solution in the reaction container 1 to 9.4-9.8;
s5: driving a peristaltic pump to add the prepared sodium hydroxide and magnesium sulfate solution into the reactor, controlling the pH value in the reaction container 1 to be 9.4-9.8, and keeping the temperature for 1h at 90 ℃ after the solution is added; the prepared sodium hydroxide solution and magnesium sulfate solution are dripped within 3 hours; if the sodium hydroxide and magnesium sulfate solutions are not added simultaneously, the remaining amount of one solution is not required to be added to the reactor after the addition of the other solution
S6: naturally cooling to 40 ℃, filtering under reduced pressure, washing the obtained crystal with water at 40 ℃ for multiple times, and drying by blowing at 60 ℃ for 20 hours.
Preferably, referring to fig. 3 again, in a specific embodiment of the present invention, in step S2, the reaction vessel 1 includes a reaction tank 101, support legs are fixedly connected to the outside of the reaction tank 101 at equal intervals, slag outlets 102 are disposed on both sides of the reaction tank 101, a sealing cover 103 is movably mounted on each slag outlet 102, a liquid outlet 104 is disposed at the lower end of the reaction tank 101, a switch valve 105 is mounted on the liquid outlet 104, a liquid inlet 106 is disposed at the top of the reaction tank 101, a fixed toothed ring 109 is fixedly connected to the middle portion of the inner side of the reaction tank 101, a power motor 107 is fixedly connected to the hardened front section, an output shaft of the power motor 107 extends to the inside of the reaction tank 101, and a fixed toothed ring 109 is fixedly connected to the tail end of the power motor 107; the aqueous solution prepared in step S1 is transferred to the inside of the reaction tank 101 through the liquid inlet 106 disposed above the reaction tank 101 by driving the driving pump, the temperature of the solution inside the reaction tank 101 is controlled during use, the temperature of the solution is monitored in real time, the switch valve 105 disposed on the liquid outlet 104 can be opened after crystallization is completed to discharge the solution in the reaction tank 101, and the crystal can be discharged through the slag outlet 102 after washing is completed.
Preferably, in an embodiment of the present invention, referring to fig. 4 again, in step S2, the stirring device includes a rotating mechanism 6 rotatably connected inside the reaction box 101 and a filtering mechanism 7 disposed at the bottom of the reaction box 101, and a scraper mechanism 8 is disposed between the rotating mechanism 6 and the filtering mechanism 7; the rotating mechanism 6 comprises a rotating bracket 601 which is rotatably connected inside the reaction box body 101, the upper part of the rotating bracket 601 is fixedly connected with a rotating gear ring 602, the rotating bracket 601 is rotatably connected with a rotating gear 603, the rotating gear 603 is meshed with the fixed gear ring 109, and the rotating gear ring 602 is in transmission connection with the power gear 108; the filtering mechanism 7 comprises a filtering bracket 701, an elastic filtering net 702 is installed on the filtering bracket 701, a filtering telescopic rod 703 is arranged between the middle part of the filtering bracket 701 and the rotating bracket 601, the lower end of the filtering telescopic rod 703 is fixedly connected to the filtering bracket 701, the upper end of the filtering telescopic rod 703 is rotatably connected to the rotating bracket 601, and a filtering fixing ring 704 is rotatably connected to the filtering telescopic rod 703; the driving power motor 107 drives the power gear 108 to be meshed with the rotating toothed ring 602 so as to drive the rotating support 601 to rotate in the reaction box body 101, the rotating support 601 drives the scraper mechanism 8 to rotate by meshing the rotating gear 603 with the fixed toothed ring 109 in the rotating process, so that the crystals can be stirred in the crystal washing process, the crystals concentrated in the middle of the elastic filter screen 702 move to the periphery, the crystals are distributed more uniformly, and the crystals are comprehensively cleaned by matching with a cleaning solution; after the crystals are cleaned, the telescopic rod 703 is driven to contract, the filtering support 701 and the elastic filtering net 702 which are arranged at the moment deform to be completely in a horizontal state, the crystals can be pushed to move towards the edge of the filtering support 701 by matching with the continuous rotation of the scraping plate mechanism 8, and the crystals are accelerated to be discharged from the slag discharge port 102 under the condition that the scraping plate mechanism 8 rotates in the circumferential direction in the reaction box body 101.
Preferably, in an embodiment of the present invention, referring to fig. 5 again, the scraper mechanism 8 includes a scraper rotating rod 801, two ends of the scraper rotating rod 801 are rotatably connected with scraper supports 802, one of the scraper supports 802 is rotatably connected to the filter fixing ring 704, the other scraper support 802 is slidably connected to a slotted hole on the rotating support 601, and one end of the scraper rotating rod 801 is in transmission connection with the rotating gear 603 through a universal joint 803; by connecting the scraper supports 802 to the two ends of the scraper swing rod 801, the scraper swing rod 801 and the elastic filter screen 702 can be in a parallel state all the time when the filter mechanism 7 deforms, and the universal joint 803 can ensure the transmission between the scraper swing rod 801 and the rotating gear 603 when the scraper swing rod 801 is in any position.
The magnesium hydroxide is used as a reaction crystallization raw material of the hydrotalcite, can improve the poor filtration efficiency in the preparation process of the magnesium hydroxide and the preparation process of the hydrotalcite, and improves the infrared purity of the product to be qualified.
The invention relates to a preparation method and application of magnesium hydroxide, wherein the working principle of the device is as follows:
the method comprises the following steps: weighing sodium hydroxide and magnesium sulfate, and preparing the sodium hydroxide and the magnesium sulfate into aqueous solution;
step two: adding water into the reaction container 1, controlling the temperature of the water, driving a stirring device to stir, and then heating to 90 ℃; the stirring speed of the stirring device is set to 180 rpm;
step three: adding magnesium hydroxide crystal, and stirring at 90 deg.C for 10 min; the added magnesium hydroxide crystals have an average particle size of between 11 and 16 microns;
step four: dropwise adding the prepared sodium hydroxide solution into the reaction container 1, and adjusting the pH of the solution in the reaction container 1 to 9.4-9.8;
step five: driving a peristaltic pump to add the prepared sodium hydroxide and magnesium sulfate solution into the reactor, controlling the pH value in the reaction container 1 to be 9.4-9.8, and keeping the temperature for 1h at 90 ℃ after the solution is added; the prepared sodium hydroxide solution and magnesium sulfate solution are dripped within 3 hours; if the sodium hydroxide and magnesium sulfate solutions are not added simultaneously, the remaining amount of one solution is not required to be added to the reactor after the addition of the other solution
Step six: naturally cooling to 40 ℃, filtering under reduced pressure, washing the obtained crystal with water at 40 ℃ for multiple times, and drying by blowing at 60 ℃ for 20 hours.
The water solution prepared in the step S1 is conveyed to the inside of the reaction box 101 through a liquid inlet 106 arranged above the reaction box 101 by driving a driving pump, the temperature of the solution inside the reaction box 101 is controlled in the using process, the solution temperature is monitored in real time, a switch valve 105 arranged on a liquid outlet 104 can be opened after crystallization is completed to discharge the solution in the reaction box 101, and the crystal can be discharged through a slag outlet 102 after washing is completed; the driving power motor 107 drives the power gear 108 to be meshed with the rotating toothed ring 602 so as to drive the rotating support 601 to rotate in the reaction box body 101, the rotating support 601 drives the scraper mechanism 8 to rotate by meshing the rotating gear 603 with the fixed toothed ring 109 in the rotating process, so that the crystals can be stirred in the crystal washing process, the crystals concentrated in the middle of the elastic filter screen 702 move to the periphery, the crystals are distributed more uniformly, and the crystals are comprehensively cleaned by matching with a cleaning solution; after the crystals are cleaned, the filtering telescopic rod 703 is driven to contract, the filtering support 701 and the elastic filtering net 702 arranged at the moment deform to be completely in a horizontal state, the obtained crystals can be pushed to move towards the edge of the filtering support 701 by matching with the continuous rotation of the scraping plate mechanism 8, and the discharge of the crystals at the slag discharge port 102 is accelerated under the condition that the scraping plate mechanism 8 rotates in the circumferential direction in the reaction box body 101; by connecting the scraper supports 802 at the two ends of the scraper swing lever 801, the arrangement can ensure that the scraper swing lever 801 is parallel to the elastic filter screen 702 at any time when the filter mechanism 7 deforms, and the arrangement of the universal joint 803 can ensure the transmission between the scraper swing lever 801 and the rotating gear 603 when the scraper swing lever 801 is at any position.
The present invention is not limited to the above-mentioned alternative embodiments, and any other various products can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, all of which fall within the scope of the present invention, fall within the protection scope of the present invention.
Claims (10)
1. A preparation method of magnesium hydroxide is characterized by comprising the following steps: the preparation method of the magnesium hydroxide comprises the following steps:
s1: weighing sodium hydroxide and magnesium sulfate, and preparing the sodium hydroxide and the magnesium sulfate into aqueous solution;
s2: adding water into the reaction container (1), controlling the temperature of the water, driving a stirring device to stir, and then heating to 90 ℃;
s3: adding magnesium hydroxide crystal, and stirring at 90 deg.C for 10 min;
s4: dropwise adding the prepared sodium hydroxide solution into the reaction container (1), and adjusting the pH of the solution in the reaction container (1) to 9.4-9.8;
s5: driving a peristaltic pump to add the prepared sodium hydroxide and magnesium sulfate solution into the reactor, controlling the pH value in the reaction container (1) to be maintained between 9.4 and 9.8, and preserving the temperature for 1h at 90 ℃ after the solution is added;
s6: naturally cooling to 40 ℃, filtering under reduced pressure, washing the obtained crystal with water at 40 ℃ for multiple times, and drying by blowing at 60 ℃ for 20 hours.
2. The method for preparing magnesium hydroxide according to claim 1, wherein: the stirring rotation speed of the stirring device in step S2 was set to 180 rpm.
3. The method for preparing magnesium hydroxide according to claim 1, wherein: the magnesium hydroxide crystals added in step S3 have an average particle size of between 11 and 16 microns.
4. The method for preparing magnesium hydroxide according to claim 1, wherein: the sodium hydroxide solution and the magnesium sulfate solution prepared in the step S5 are dripped within 3 h; in step S5, if the sodium hydroxide and magnesium sulfate solutions are not added simultaneously, the remaining amount of one solution does not need to be added to the reactor when the other solution is added.
5. The method for preparing magnesium hydroxide according to claim 1, wherein: in step S2 reaction container (1) includes reaction box (101), the outside equidistance fixedly connected with supporting leg of reaction box (101), the both sides of reaction box (101) all are provided with row cinder notch (102), every equal movable mounting has sealed lid (103) on row cinder notch (102), the lower extreme of reaction box (101) is provided with leakage fluid dram (104), install ooff valve (105) on leakage fluid dram (104), the top of reaction box (101) sets up inlet (106), inboard middle part fixedly connected with fixed ring gear (109) of reaction box (101), send out hard anterior segment fixedly connected with motor power (107), the output shaft of motor power (107) extends to the inside of reaction box (101) and at its terminal fixedly connected with fixed ring gear (109).
6. The method for preparing magnesium hydroxide according to claim 5, wherein: in the step S2, the stirring device comprises a rotating mechanism (6) rotatably connected inside the reaction box body (101) and a filtering mechanism (7) arranged at the bottom of the reaction box body (101), and a scraper mechanism (8) is arranged between the rotating mechanism (6) and the filtering mechanism (7).
7. The method for preparing magnesium hydroxide according to claim 6, wherein: slewing mechanism (6) are connected including rotating inside rotation support (601) of reaction box (101), rotation support (601) upper portion fixedly connected with rotates ring gear (602), it is connected with rotating gear (603) to rotate on rotation support (601), rotating gear (603) go up with the meshing is connected between fixed ring gear (109), rotate ring gear (602) with the transmission is connected between power gear (108).
8. The method for preparing magnesium hydroxide according to claim 7, wherein: the filtering mechanism (7) comprises a filtering support (701), an elastic filtering net (702) is installed on the filtering support (701), a filtering telescopic rod (703) is arranged between the middle of the filtering support (701) and the rotating support (601), the lower end of the filtering telescopic rod (703) is fixedly connected onto the filtering support (701), the upper end of the filtering telescopic rod (703) is rotatably connected onto the rotating support (601), and a filtering fixing ring (704) is rotatably connected onto the filtering telescopic rod (703).
9. The method for preparing magnesium hydroxide according to claim 8, wherein: scraper mechanism (8) are including scraper blade swing arm (801), the both ends of scraper blade swing arm (801) are all rotated and are connected with scraper blade support (802), one of them scraper blade support (802) rotate to be connected on filtering fixed ring (704), another scraper blade support (802) sliding connection be in rotate slotted hole on support (601), the one end of scraper blade swing arm (801) with connect through universal joint (803) transmission between running gear (603).
10. Use of a magnesium hydroxide according to claims 1-9, characterized in that: the magnesium hydroxide is used as a reaction crystallization raw material of the hydrotalcite, so that the problem of poor filtering efficiency in the preparation process of the magnesium hydroxide and the preparation process of the hydrotalcite can be solved, and the infrared purity of the product is improved to be qualified.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114669262A (en) * | 2022-04-19 | 2022-06-28 | 广西南宁百会药业集团有限公司 | Magnesium hydroxide preparation facilities |
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| CH359685A (en) * | 1955-09-12 | 1962-01-31 | Jung Hans | Process and rotary drum filter for filtering solids from a cloudy liquid |
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| CN114669262B (en) * | 2022-04-19 | 2024-03-22 | 广西南宁百会药业集团有限公司 | Magnesium hydroxide preparation facilities |
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