CN114735728B - Preparation method and application of magnesium hydroxide - Google Patents
Preparation method and application of magnesium hydroxide Download PDFInfo
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- CN114735728B CN114735728B CN202210407313.3A CN202210407313A CN114735728B CN 114735728 B CN114735728 B CN 114735728B CN 202210407313 A CN202210407313 A CN 202210407313A CN 114735728 B CN114735728 B CN 114735728B
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- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 title claims abstract description 40
- 239000000347 magnesium hydroxide Substances 0.000 title claims abstract description 40
- 229910001862 magnesium hydroxide Inorganic materials 0.000 title claims abstract description 40
- 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 64
- 239000000243 solution Substances 0.000 claims abstract description 60
- 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 46
- 238000003756 stirring Methods 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 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 13
- 238000005406 washing Methods 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 11
- 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
- 239000007788 liquid Substances 0.000 claims description 16
- 239000002893 slag Substances 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000007790 scraping Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 4
- 238000004519 manufacturing process Methods 0.000 claims 3
- 238000002425 crystallisation Methods 0.000 abstract description 8
- 230000008025 crystallization Effects 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- UJOHNXQDVUADCG-UHFFFAOYSA-L aluminum;magnesium;carbonate Chemical compound [Mg+2].[Al+3].[O-]C([O-])=O UJOHNXQDVUADCG-UHFFFAOYSA-L 0.000 description 6
- 238000009826 distribution Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- AXDJCCTWPBKUKL-UHFFFAOYSA-N 4-[(4-aminophenyl)-(4-imino-3-methylcyclohexa-2,5-dien-1-ylidene)methyl]aniline;hydron;chloride Chemical compound Cl.C1=CC(=N)C(C)=CC1=C(C=1C=CC(N)=CC=1)C1=CC=C(N)C=C1 AXDJCCTWPBKUKL-UHFFFAOYSA-N 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
Classifications
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- 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
Landscapes
- 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, comprising the following steps: s1: weighing sodium hydroxide and magnesium sulfate, and preparing the sodium hydroxide and the magnesium sulfate into an aqueous solution; s2: adding water into a reaction container, controlling the temperature of the water, driving a stirring device to stir the water, and then heating the water to 90 ℃; s3: magnesium hydroxide crystals are added, S4: dropwise adding the prepared sodium hydroxide solution into a reaction container, and adjusting the pH of the solution in the reaction container to be 9.4-9.8; s5: a peristaltic pump is driven to add the prepared sodium hydroxide and magnesium sulfate solution into the reactor, and the solution is kept at 90 ℃ for 1h 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 in the process and a seed crystal adding method, and the large-particle spherical magnesium hydroxide product with the D50 of about 20 microns is successfully prepared, so that the 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 preparation of the magnesium hydroxide large particle product with the particle size of about 20 microns and the application of the magnesium aluminum carbonate reaction crystallization raw material can improve the poor filtration efficiency of the magnesium hydroxide preparation process and the magnesium aluminum carbonate preparation process, and is expected to realize qualified product purity outside fuchsin, however, the magnesium hydroxide is not sold by companies in the market, and the preparation of the large particle spherical magnesium hydroxide is a technical bottleneck.
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:
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 an aqueous solution;
s2: adding water into a reaction container, controlling the temperature of the water, driving a stirring device to stir the water, and then heating the water to 90 ℃;
s3: adding magnesium hydroxide crystal, and continuously stirring at 90 ℃ for 10min;
s4: dropwise adding the prepared sodium hydroxide solution into a reaction container, and adjusting the pH of the solution in the reaction container to be 9.4-9.8;
s5: a peristaltic pump is driven to add the prepared sodium hydroxide and magnesium sulfate solution into the reactor, the pH value in the reaction container is controlled to be maintained between 9.4 and 9.8, and the solution is kept at the temperature of 90 ℃ for 1h 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 rotation speed of the stirring device in step S2 is set to 180rpm.
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 dropwise added within 3 hours; in step S5, if the sodium hydroxide and magnesium sulfate solutions are not added at the same time, then when one solution is added, the remaining amount of the other solution does not need to be added to the reactor.
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 the sediment mouth, every equal movable mounting has sealed lid on the sediment mouth, 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 fixed ring gear of reaction box inboard middle part fixedly connected with, the fixed motor of front end fixedly connected with of hardening, the output shaft of motor extends to the inside of reaction box and at its end fixedly connected with fixed ring gear.
Preferably, in step S2, the stirring device includes a rotating mechanism rotatably connected to the inside of the reaction tank and a filtering mechanism disposed at the bottom of the reaction tank, and a scraper mechanism is disposed between the rotating mechanism and the filtering mechanism.
Preferably, the rotating mechanism comprises a rotating bracket which is rotationally connected inside the reaction box body, a rotating toothed ring is fixedly connected to the upper part of the rotating bracket, a rotating gear is rotationally connected to the rotating bracket, the rotating gear is in meshed connection with the fixed toothed ring, and the rotating toothed ring is in transmission connection with the power gear.
Preferably, the filtering mechanism comprises a filtering support, an elastic filter screen is arranged on the filtering support, a filtering telescopic rod is arranged between the middle part of the filtering support and the rotating support, the lower end of the filtering telescopic rod is fixedly connected to the filtering support, the upper end of the filtering telescopic rod is rotatably connected to the rotating support, and a filtering fixing ring is rotatably connected to the filtering telescopic rod.
Preferably, the scraper mechanism comprises a scraper rotating rod, two ends of the scraper rotating rod are respectively and rotatably connected with a scraper bracket, one scraper bracket is rotatably connected to the filtering fixing ring, the other scraper bracket is slidably connected to a slot hole on the rotating bracket, and one end of the scraper rotating rod is in transmission connection with the rotating gear through a universal joint.
The application of the magnesium hydroxide in the aluminum magnesium carbonate reaction crystallization raw material can improve poor filtration efficiency in the magnesium hydroxide preparation process and the aluminum magnesium carbonate preparation process and improve qualified product purity.
The beneficial effects of the invention are as follows:
1. the magnesium hydroxide prepared by the step is more beneficial to magnesium hydroxide crystallization by controlling the pH value in the process and a seed crystal adding method, and the large-particle spherical magnesium hydroxide product with the D50 of about 20 microns is successfully prepared, so that the large-particle spherical magnesium hydroxide is a technical bottleneck.
2. The reaction device can utilize the page height difference of the solutions at two sides when the sodium hydroxide solution and the magnesium sulfate solution can not be added at the same time, and stop the solution at the other side after the solution at 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 magnesium hydroxide is avoided.
3. This reaction unit rotates inside the reaction box through rotating the support, rotates the support through making its meshing between rotation gear and the fixed ring gear of pivoted in-process, drives scraper blade mechanism and rotates, and then can stir at the in-process of washing crystal, will concentrate the crystal at elastic filter screen middle part and remove all around, makes the better of its distribution even, cooperates the washing liquid to clear up the crystal comprehensively.
4. This reaction unit is through setting up the filtration telescopic link between filtration support and rotation support, contracts after washing the crystal and drives filtration and elastic filter screen and will take place deformation, makes it be in the horizontality completely, and the continuous rotation of cooperation scraper blade mechanism can promote the crystal that obtains and remove to filtration support edge, under the circumstances that scraper blade mechanism circumferentially rotates in the reaction box, accelerates the crystal and discharges at the mouth of arranging sediment.
Drawings
The invention will be described in further detail with reference to the accompanying drawings and detailed description.
FIG. 1 is a schematic view of the overall axial side structure 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 the reaction vessel of the present invention;
FIG. 4 is a schematic view of a rotary mechanism and a filter mechanism according to the present invention;
fig. 5 is a schematic view of the scraper mechanism of the present invention.
In the figure: 1-reaction vessel, 101-reaction box, 102-slag discharge port, 103-sealing cover, 104-liquid discharge port, 105-switching 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 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 drawings and specific examples.
The following describes embodiments of the present invention with reference to fig. 1 to 5, a method for preparing magnesium hydroxide and application thereof, the method for preparing magnesium hydroxide comprising the steps of:
s1: weighing sodium hydroxide and magnesium sulfate, and preparing the sodium hydroxide and the magnesium sulfate into an aqueous solution;
s2: adding water into the reaction vessel 1, controlling the temperature of the water, driving a stirring device to stir the water, and then heating the water to 90 ℃; the stirring rotation speed of the stirring device is set to 180rpm;
s3: adding magnesium hydroxide crystal, and continuously stirring at 90 ℃ for 10min; the average particle size of the added magnesium hydroxide crystals is 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 be 9.4-9.8;
s5: a peristaltic pump is driven to add the prepared sodium hydroxide and magnesium sulfate solution into the reactor, the pH value in the reaction vessel 1 is controlled to be maintained between 9.4 and 9.8, and the solution is kept at the temperature of 90 ℃ for 1h after the solution is added; the prepared sodium hydroxide solution and magnesium sulfate solution are added dropwise within 3 hours; if the sodium hydroxide and magnesium sulfate solutions are not added simultaneously, then when one solution is added, the remaining amount of the other solution does not need to be added to the reactor
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.
In a specific embodiment of the present invention, referring again to fig. 3, in step S2, the reaction vessel 1 includes a reaction box 101, support legs are fixedly connected to the outside of the reaction box 101 at equal intervals, slag discharge ports 102 are provided on both sides of the reaction box 101, a sealing cover 103 is movably mounted on each slag discharge port 102, a liquid outlet 104 is provided at the lower end of the reaction box 101, a switch valve 105 is mounted on the liquid outlet 104, a liquid inlet 106 is provided at the top of the reaction box 101, a fixed toothed ring 109 is fixedly connected to the middle part of the inside of the reaction box 101, a power motor 107 is fixedly connected to the front end of the power motor 107, and an output shaft of the power motor 107 extends into the reaction box 101 and is fixedly connected to the fixed toothed ring 109 at the end of the power motor; the aqueous solution prepared in step S1 is conveyed to the inside of the reaction tank 101 through a liquid inlet 106 arranged above the reaction tank 101 by driving a driving pump, the temperature of the solution in the reaction tank 101 is controlled in the use process, the temperature of the solution is monitored in real time, after crystallization is completed, a switching valve 105 arranged on a liquid outlet 104 can be opened to discharge the solution in the reaction tank 101, and after washing is completed, crystals can be discharged through a slag discharge port 102.
Preferably, in one embodiment of the present invention, referring again to fig. 4, in step S2, the stirring device includes a rotating mechanism 6 rotatably connected to the inside of the reaction tank 101 and a filtering mechanism 7 disposed at the bottom of the reaction tank 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, a rotating toothed ring 602 is fixedly connected to the upper part of the rotating bracket 601, a rotating gear 603 is rotatably connected to the rotating bracket 601, the rotating gear 603 is in meshed connection with the fixed toothed ring 109, and the rotating toothed ring 602 is in transmission connection with the power gear 108; the filtering mechanism 7 comprises a filtering bracket 701, an elastic filter screen 702 is mounted 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 power motor 107 is driven to drive the power gear 108 to be meshed with the rotating toothed ring 602, so that the rotating support 601 is driven to rotate in the reaction box 101, and the rotating support 601 drives the scraper mechanism 8 to rotate by enabling the rotating gear 603 to be meshed 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 are moved to the periphery, the distribution of the crystals is better and uniform, and the crystals are comprehensively cleaned by matching with cleaning liquid; after the crystal is washed, the filtering telescopic rod 703 is driven to shrink, and the filtering support 701 and the elastic filter screen 702 which are arranged at the moment are deformed to be in a horizontal state completely, so that the obtained crystal can be pushed to move towards the edge of the filtering support 701 by being matched with the continuous rotation of the scraper mechanism 8, and the discharge of the crystal at the slag discharge port 102 is quickened under the condition that the scraper mechanism 8 circumferentially rotates in the reaction box 101.
Preferably, in one embodiment of the present invention, referring again to fig. 5, the scraper mechanism 8 includes a scraper rotary rod 801, two ends of the scraper rotary rod 801 are rotatably connected to a scraper support 802, one of the scraper supports 802 is rotatably connected to the filtering fixing ring 704, the other scraper support 802 is slidably connected to a slot hole on the rotating support 601, and one end of the scraper rotary rod 801 is in transmission connection with the rotating gear 603 through a universal joint 803; through connecting scraper support 802 at the both ends of scraper rotary rod 801, such setting can be in parallel state constantly between scraper rotary rod 801 and the elastic filter screen 702 when filter mechanism 7 takes place deformation, and the transmission between scraper rotary rod 801 and the rotation gear 603 can all be guaranteed to the setting of universal joint 803 when scraper rotary rod 801 is in any position.
The application of the magnesium hydroxide in the aluminum magnesium carbonate reaction crystallization raw material can improve poor filtration efficiency in the magnesium hydroxide preparation process and the aluminum magnesium carbonate preparation process and improve qualified product purity.
The invention relates to a preparation method and application of magnesium hydroxide, and the working principle of the device is as follows:
step one: weighing sodium hydroxide and magnesium sulfate, and preparing the sodium hydroxide and the magnesium sulfate into an aqueous solution;
step two: adding water into the reaction vessel 1, controlling the temperature of the water, driving a stirring device to stir the water, and then heating the water to 90 ℃; the stirring rotation speed of the stirring device is set to 180rpm;
step three: adding magnesium hydroxide crystal, and continuously stirring at 90 ℃ for 10min; the average particle size of the added magnesium hydroxide crystals is 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 be 9.4-9.8;
step five: a peristaltic pump is driven to add the prepared sodium hydroxide and magnesium sulfate solution into the reactor, the pH value in the reaction vessel 1 is controlled to be maintained between 9.4 and 9.8, and the solution is kept at the temperature of 90 ℃ for 1h after the solution is added; the prepared sodium hydroxide solution and magnesium sulfate solution are added dropwise within 3 hours; if the sodium hydroxide and magnesium sulfate solutions are not added simultaneously, then when one solution is added, the remaining amount of the other solution does not need to be added to the reactor
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 into the reaction box body 101 through a liquid inlet 106 arranged above the reaction box body 101 by driving a driving pump, the temperature of the solution in the reaction box body 101 is controlled in the using process, the temperature of the solution is monitored in real time, a switching valve 105 arranged on a liquid outlet 104 can be opened to discharge the solution in the reaction box body 101 after crystallization is finished, and crystals can be discharged through a slag discharge port 102 after washing is finished; the power motor 107 is driven to drive the power gear 108 to be meshed with the rotating toothed ring 602, so that the rotating support 601 is driven to rotate in the reaction box 101, and the rotating support 601 drives the scraper mechanism 8 to rotate by enabling the rotating gear 603 to be meshed 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 are moved to the periphery, the distribution of the crystals is better and uniform, and the crystals are comprehensively cleaned by matching with cleaning liquid; after the crystal is washed, the filtering telescopic rod 703 is driven to shrink, and at the moment, the filtering bracket 701 and the elastic filter screen 702 which are arranged are deformed to be in a horizontal state completely, and the obtained crystal can be pushed to move towards the edge of the filtering bracket 701 by being matched with the continuous rotation of the scraper mechanism 8, so that the crystal is accelerated to be discharged at the slag discharge port 102 under the condition that the scraper mechanism 8 rotates circumferentially in the reaction box 101; through connecting scraper support 802 at the both ends of scraper rotary rod 801, such setting can be in parallel state constantly between scraper rotary rod 801 and the elastic filter screen 702 when filter mechanism 7 takes place deformation, and the transmission between scraper rotary rod 801 and the rotation gear 603 can all be guaranteed to the setting of universal joint 803 when scraper rotary rod 801 is in any position.
The invention is not limited to the above-described alternative embodiments, and any person who may derive other various forms of products in the light of the present invention, however, any changes in shape or structure thereof, all falling within the technical solutions defined in the scope of the claims of the present invention, fall within the scope of protection of the present invention.
Claims (4)
1. A preparation method of magnesium hydroxide is characterized in that: 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 an aqueous solution;
s2: adding water into a reaction container (1) and controlling the temperature of the water, driving a stirring device to stir the water, and then heating the water to 90 ℃;
s3: adding magnesium hydroxide crystal, and continuously stirring at 90 ℃ for 10min;
s4: dropwise adding the prepared sodium hydroxide solution into the reaction container (1), and adjusting the pH value of the solution in the reaction container (1) to be 9.4-9.8;
s5: a peristaltic pump is driven to add the prepared sodium hydroxide and magnesium sulfate solution into the reactor, the pH value in the reaction vessel (1) is controlled to be maintained between 9.4 and 9.8, and the solution is kept at 90 ℃ for 1h after the solution is added;
s6: naturally cooling to 40 ℃, decompressing and filtering, washing the obtained crystal with water of 40 ℃ for multiple times, and drying by blowing air for 20 hours at 60 ℃;
in the step S2, the reaction container (1) comprises a reaction box body (101), support legs are fixedly connected to the outside of the reaction box body (101) at equal intervals, slag discharging ports (102) are formed in two sides of the reaction box body (101), sealing covers (103) are movably mounted on each slag discharging port (102), a liquid discharging port (104) is formed in the lower end of the reaction box body (101), a switch valve (105) is mounted on the liquid discharging port (104), a liquid inlet (106) is formed in the top of the reaction box body (101), a fixed toothed ring (109) is fixedly connected to the middle of the inner side of the reaction box body (101), a power motor (107) is fixedly connected to the front end of the reaction box body (101), and an output shaft of the power motor (107) extends to the inside of the reaction box body (101) and is fixedly connected with the fixed toothed ring (109) at the tail end of the power motor;
the stirring device in the step S2 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), wherein a scraping plate mechanism (8) is arranged between the rotating mechanism (6) and the filtering mechanism (7);
the rotating mechanism (6) comprises a rotating bracket (601) which is rotationally connected inside the reaction box body (101), a rotating toothed ring (602) is fixedly connected to the upper part of the rotating bracket (601), a rotating gear (603) is rotationally connected to the rotating bracket (601), the rotating gear (603) is in meshed connection with the fixed toothed ring (109), and the rotating toothed ring (602) is in transmission connection with the power gear (108);
the filtering mechanism (7) comprises a filtering support (701), an elastic filter screen (702) is arranged on the filtering support (701), a filtering telescopic rod (703) is arranged between the middle part of the filtering support (701) and the rotating support (601), the lower end of the filtering telescopic rod (703) is fixedly connected to the filtering support (701), the upper end of the filtering telescopic rod (703) is rotatably connected to the rotating support (601), and a filtering fixing ring (704) is rotatably connected to the filtering telescopic rod (703);
the scraper mechanism (8) comprises a scraper rotating rod (801), two ends of the scraper rotating rod (801) are rotatably connected with scraper supports (802), one scraper support (802) is rotatably connected to the filtering fixing ring (704), the other scraper support (802) is slidably connected to a slot 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);
the power motor (107) is driven to drive the power gear (108) to be meshed with the rotary toothed ring (602), so that the rotary support (601) is driven to rotate in the reaction box body (101), the rotary support (601) drives the scraper mechanism (8) to rotate through the meshing between the rotary gear (603) and the fixed toothed ring (109) in the rotating process, and then the crystals are stirred in the crystal washing process, and the crystals concentrated in the middle of the elastic filter screen (702) are moved to the periphery, so that the crystals are distributed more uniformly and are comprehensively cleaned by matching with the cleaning liquid; after the crystals are washed, the filtering telescopic rods (703) are driven to shrink, the filtering support (701) and the elastic filter screen (702) are deformed to be in a horizontal state completely, the obtained crystals are pushed to move towards the edge of the filtering support (701) by being matched with continuous rotation of the scraper mechanism (8), and the crystals are accelerated to be discharged at the slag discharge port (102) under the condition that the scraper mechanism (8) circumferentially rotates in the reaction box body (101);
through connecting scraper support (802) at the both ends of scraper blade dwang (801), such setting is in parallel state when filter mechanism (7) takes place deformation between scraper blade dwang (801) and elastic filter screen (702) constantly, and the transmission between scraper blade dwang (801) and rotation gear (603) can all be guaranteed in the setting of universal joint (803) when scraper blade dwang (801) are in any position.
2. The method for producing magnesium hydroxide according to claim 1, wherein: the stirring rotation speed of the stirring device in step S2 was set to 180rpm.
3. The method for producing 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 producing magnesium hydroxide according to claim 1, wherein: the sodium hydroxide solution and the magnesium sulfate solution prepared in the step S5 are added dropwise within 3 hours; in step S5, if the sodium hydroxide and magnesium sulfate solutions are not added at the same time, then when one solution is added, the remaining amount of the other solution does not need to be added to the reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210407313.3A CN114735728B (en) | 2022-04-19 | 2022-04-19 | Preparation method and application of magnesium hydroxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210407313.3A CN114735728B (en) | 2022-04-19 | 2022-04-19 | Preparation method and application of magnesium hydroxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114735728A CN114735728A (en) | 2022-07-12 |
| CN114735728B true CN114735728B (en) | 2024-01-26 |
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