CN220143355U - DTB type reaction crystallizer for producing high-purity magnesium hydroxide - Google Patents
DTB type reaction crystallizer for producing high-purity magnesium hydroxide Download PDFInfo
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- CN220143355U CN220143355U CN202320439216.2U CN202320439216U CN220143355U CN 220143355 U CN220143355 U CN 220143355U CN 202320439216 U CN202320439216 U CN 202320439216U CN 220143355 U CN220143355 U CN 220143355U
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- salt solution
- feeding coil
- magnesium salt
- shell
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- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 title claims abstract description 39
- 239000000347 magnesium hydroxide Substances 0.000 title claims abstract description 39
- 229910001862 magnesium hydroxide Inorganic materials 0.000 title claims abstract description 39
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 37
- 159000000003 magnesium salts Chemical class 0.000 claims abstract description 58
- 239000012266 salt solution Substances 0.000 claims abstract description 58
- 239000003513 alkali Substances 0.000 claims abstract description 57
- 238000003756 stirring Methods 0.000 claims abstract description 33
- 238000002156 mixing Methods 0.000 claims abstract description 24
- 238000003825 pressing Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 6
- 238000010979 pH adjustment Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 32
- 239000002245 particle Substances 0.000 abstract description 27
- 239000013078 crystal Substances 0.000 abstract description 11
- 150000002500 ions Chemical class 0.000 abstract description 7
- 238000005054 agglomeration Methods 0.000 abstract description 3
- 230000002776 aggregation Effects 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 23
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 20
- 239000000243 solution Substances 0.000 description 20
- 229960002337 magnesium chloride Drugs 0.000 description 10
- 229910001629 magnesium chloride Inorganic materials 0.000 description 10
- 238000004062 sedimentation Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 235000011121 sodium hydroxide Nutrition 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000009826 distribution Methods 0.000 description 6
- 239000000395 magnesium oxide Substances 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 5
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012796 inorganic flame retardant Substances 0.000 description 1
- 238000010667 large scale reaction Methods 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 229940050906 magnesium chloride hexahydrate Drugs 0.000 description 1
- DHRRIBDTHFBPNG-UHFFFAOYSA-L magnesium dichloride hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-] DHRRIBDTHFBPNG-UHFFFAOYSA-L 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The utility model relates to a DTB type reaction crystallizer for producing high-purity magnesium hydroxide, which comprises a shell, a guide cylinder, a central cylinder, a down-pressing stirring paddle, an alkali liquor feeding coil pipe and a magnesium salt solution feeding coil pipe; the guide cylinder is sleeved outside the center cylinder, the center cylinder is sleeved outside the downward-pressing type stirring paddle, the area between the guide cylinder and the center cylinder is used as a guide channel, the inner area of the center cylinder is used as a mixing area, liquid in the mixing area moves downwards under the stirring of the downward-pressing type stirring paddle, and the liquid in the guide channel moves upwards and then enters the mixing area to form fluid circulation; the alkali liquor feeding coil pipe is arranged on the upper portion of the mixing area, the magnesium salt solution feeding coil pipe is arranged on the upper portion of the diversion channel, ions in the magnesium salt solution and the alkali liquor are mixed under the carrying of liquid circulation, uniform reaction can be achieved, the particle size of the produced magnesium hydroxide crystals is uniform, and the phenomenon of agglomeration can not occur.
Description
Technical Field
The utility model relates to a reaction crystallizer, in particular to a structure of a DTB type reaction crystallizer for producing high-purity magnesium hydroxide crystals.
Background
The high-purity magnesium hydroxide is an important functional material, can be used as an inorganic flame retardant, an environment-friendly neutralizer and the like, and is also a high-quality raw material of high-end magnesium oxide products such as high-purity light magnesium hydroxide, medical magnesium oxide, food-grade magnesium oxide, electrical-grade magnesium oxide, silicon steel-grade magnesium oxide and the like.
The prior art CFD simulation of a large-scale reaction crystallizer for high-purity magnesium hydroxide (university of eastern chemical: nature science edition, 2022, 48 (4): 6, ma Xiaolong, chen Hang, zhao Panpan, etc.) discloses a process for producing high-purity magnesium hydroxide by using magnesium chloride and alkali liquor discharged from the production of salt lake potassium fertilizer, and the process has the advantage of no waste discharge, and can realize the recycling of sodium chloride in the processes of magnesium hydroxide synthesis and chlor-alkali electrolysis. The above article analyzes the influence of the flow field distribution of the single phase flow and the two phase flow in the crystallizer and the particle suspension state, designs and discloses the structure of a DTB (Draft Tube Baffle, sleeve baffle type) reaction crystallizer, which is a key device in the process, and specifically discloses the overall shape and size of the DTB reaction crystallizer, and the size and mounting height of a guide cylinder, a central cylinder and a stirring paddle in the DTB reaction crystallizer.
However, in actual production, the existing DTB type reaction crystallizer has the problems of uneven reaction of alkali liquor and magnesium chloride solution, agglomeration among magnesium hydroxide crystals and uneven particle size distribution.
Disclosure of Invention
The utility model aims to solve the problems of uneven reaction, agglomeration among magnesium hydroxide crystals, uneven particle size distribution and particle size distribution of alkali liquor and magnesium salt solution in the existing DTB reaction crystallizer for producing magnesium hydroxide. In order to solve the problems, the utility model provides a DTB type reaction crystallizer (hereinafter referred to as DTB type reaction crystallizer) for producing high-purity magnesium hydroxide, which comprises a shell, a guide cylinder, a central cylinder, a down-pressing stirring paddle, an alkali liquor feeding coil pipe and a magnesium salt solution feeding coil pipe.
The shell is a closed container sealed by a top cover, the upper part is cylindrical, the lower part is in an inverted cone shape, the bottom forms an arc surface and is provided with a discharge hole, the guide cylinder, the central cylinder and the down-pressing stirring paddle are arranged inside the shell, the central shafts of the shell, the guide cylinder, the central cylinder and the down-pressing stirring paddle are overlapped, and the top cover is provided with an alkali liquor feed inlet and a magnesium salt solution feed inlet. An annular folded plate is arranged on the upper part of the inner wall of the shell to form an overflow groove, and an overflow port is formed on the lower part of the shell corresponding to the overflow groove. The draft tube is sleeved outside the central tube, and the upper end of the draft tube is higher than the upper end of the annular folded plate.
The central section of thick bamboo cover is established in the push-down stirring rake outside, and the upper end height of central section of thick bamboo is less than the upper end of annular folded plate. The lower end of the guide cylinder is higher than the lower end of the central cylinder.
The area between the guide cylinder and the central cylinder, which is lower than the upper end of the annular folded plate, is used as a guide channel, and the area inside the central cylinder, which is lower than the upper end of the annular folded plate, is used as a mixing area. The blades of the down-pressure stirring paddles are positioned in the mixing area and keep a distance from the bottom of the shell.
The alkali liquor feeding coil pipe and the magnesium salt solution feeding coil pipe are horizontally arranged annular pipes, and a plurality of through holes are uniformly formed in the pipe walls of the annular pipes and serve as discharge holes. The alkali liquor feeding coil pipe is arranged at the upper part of the mixing area and is communicated with the alkali liquor feeding hole through the alkali liquor guide pipe. The magnesium salt solution feeding coil pipe is positioned at the upper part of the diversion channel and is communicated with the magnesium salt solution feeding port through the magnesium salt solution material guiding pipe.
When the mixer is used, the liquid in the mixing area flows downwards to the sedimentation area under the stirring of the down-pressure stirring paddle. The liquid at the upper part of the partial sedimentation area and the lower part of the still water area enters the diversion channel from the opening and flows upwards, and flows into the central cylinder at the top of the diversion channel to form liquid circulation.
In the process of liquid circulation, the magnesium salt solution added by the magnesium salt solution feeding coil pipe flows along with the liquid circulation, flows from the upper end of the material guiding channel to the upper end of the central cylinder, downwards enters the mixing area, and is mixed with the alkali liquor added by the alkali liquor feeding coil pipe in the mixing area to generate chemical reaction to generate magnesium hydroxide small particles.
The magnesium hydroxide small particles circulate and grow along with the liquid, and gradually become magnesium hydroxide large particles. The magnesium hydroxide large particles can sink after entering the sedimentation area along with the liquid circulation, are accumulated at the bottom of the sedimentation area, do not flow along with the liquid circulation any more, and are finally discharged from the discharge hole.
Because the shapes of the alkali liquor feeding coil pipe and the magnesium salt solution feeding coil pipe are matched with the shapes of the material guide channel and the mixing area, ions in the magnesium salt solution and the alkali liquor are mixed under the carrying of liquid circulation, the uniform reaction can be realized, and the generated magnesium hydroxide crystals have uniform particle size and can not be agglomerated.
Preferably, the discharging holes on the alkali liquor feeding coil pipe and the magnesium salt solution feeding coil pipe are respectively positioned on the lower side tube walls of the alkali liquor feeding coil pipe and the magnesium salt solution feeding coil pipe. So that the alkali liquor and the magnesium salt solution entering the alkali liquor feeding coil 5 and the magnesium salt solution feeding coil uniformly flow out of each discharging hole by self gravity and cannot be accumulated in the tube.
Preferably, the height of the magnesium salt solution feeding coil pipe is close to the upper end of the central cylinder, and the height of the alkali liquor guide pipe is lower than that of the magnesium salt solution feeding coil pipe.
The arrangement is favorable for the ions in the magnesium salt solution to enter the central cylinder 3 along with the liquid circulation, and the distance between the alkali liquor feeding coil pipe and the magnesium salt solution feeding coil pipe is kept, so that the contact of the ions in the solution due to the too close distance between the alkali liquor feeding coil pipe and the magnesium salt solution feeding coil pipe can be prevented, the chemical reaction is uneven, and the particle size distribution of the generated magnesium hydroxide crystals is uneven.
Preferably, the shape of the guide cylinder narrows downwards, and the lower part forms an inverted cone part with an opening at the bottom.
Therefore, the reverse taper part and the formed smaller opening can play a role in shielding most of magnesium hydroxide large particles, prevent the magnesium hydroxide large particles from returning to the liquid circulation to continue growing and becoming large, and further ensure that the particle size of magnesium hydroxide crystals is uniform.
Preferably, the shell is supported by an annular supporting cylinder, a supporting cylinder outlet communicated with a discharge hole of the shell through a discharge pipeline is arranged on the annular supporting cylinder for discharging, a manhole is arranged, and a worker can enter the manhole maintenance equipment.
Preferably, the top cover is provided with a pH measuring port for inserting a pH meter, the pH measuring port being located above the diversion channel. Thus, the staff can control the process according to the measured value of the pH meter
Preferably, the top cover is provided with a temperature measuring port for inserting a thermometer, the temperature measuring port being located above the outside of the guide cylinder. Thus, the staff can control the process according to the measured values of the pH meter and the thermometer
Preferably, the housing 1 is 9 meters high and 9 meters in diameter. The inner diameter of the guide cylinder is 3.2 m, the height is 4 m, the distance between the lower end and the bottom of the inner side of the shell 1 is 3.9 m, the inner diameter of the center cylinder is 2.0 m, the height is 5.6 m, and the distance between the lower end and the bottom of the inner side of the shell 1 is 1.6 m. The diameter of the blade 41 of the down-pressure type stirring paddle 4 is 1.8 m, and the distance between the blade 41 and the bottom of the inner side of the shell 1 is 3.3 m. The down-pressure type stirring paddle 4 is an axial flow type three-blade paddle, and the diameter of the shaft 42 of the down-pressure type stirring paddle 4 is 0.25 meter. The DTB type reaction crystallizer designed according to the specification has proper height of the stirring paddles, and can not disturb the fluid in a sedimentation area and prevent the sedimentation of large magnesium hydroxide particles, but also can not cause the excessive high energy of the circulated fluid, so that particles and crystals circulate in a diversion channel and a mixing area without sedimentation.
Preferably, the cap is provided with a pH adjustment port located above said mixing zone 20. The pH of the liquid in the housing 1 can be adjusted by adding an alkali solution from a pH adjusting port.
Drawings
FIG. 1 is an explanatory view of the internal structure of a DTB-type reaction crystallizer;
FIG. 2 is a schematic illustration of the elevation of the draft tube, center tube, paddles, and isopipe;
FIG. 3 is a process diagram of a DTB-type reactive crystallizer;
FIG. 4 is a diagram illustrating the shape of an alkali liquor feed coil and a magnesium salt solution feed coil;
fig. 5 is a partial enlarged view of a portion B in fig. 4.
Detailed Description
The following describes a specific embodiment of a DTB type reaction crystallizer for producing high-purity magnesium hydroxide, which is provided by the utility model, by taking magnesium chloride discharged from the production of salt lake potassium fertilizer and a process for producing high-purity magnesium hydroxide by alkali liquor as examples.
Fig. 1 is an explanatory view of the internal structure of a DTB-type reaction crystallizer, and fig. 2 is a schematic view of the heights of a draft tube, a center tube, a stirring paddle, and an overflow tank.
As shown in fig. 1 and 2, the DTB type reaction crystallizer comprises a shell 1, a guide cylinder 2, a central cylinder 3 and a down-pressure stirring paddle 4.
As shown in fig. 1, a casing 1 is a closed container sealed by a top cover 11, the upper part is cylindrical, the lower part is in an inverted cone shape, the bottom forms an arc surface, and a discharge hole 12 is arranged. An alkali liquor feed port 111 and a magnesium salt solution feed port 112 are arranged on the top cover 11 of the shell 1.
The guide cylinder 2, the central cylinder 3 and the downward-pressing stirring paddle 4 are arranged in the shell 1, and a central axis L0 of the shell 1, a central axis L1 of the guide cylinder 2, a central axis L2 of the central cylinder 3 and a central axis L4 of the downward-pressing stirring paddle 4 are overlapped. The upper end of the shaft 42 of the downward-pressing type stirring paddle 4 is connected with a motor (not shown in the figure), and a mechanical seal is arranged between the shaft 42 and the top cover 11 to prevent leakage of materials.
An annular folded plate 131 is arranged on the upper part of the inner wall of the shell 1 to form an overflow groove 13, and an overflow port 132 is formed on the lower part of the shell 1 corresponding to the overflow groove 13. When the liquid level in the housing 1 reaches the working level E, i.e. the level E of the upper end of the annular flap 131 (see fig. 2), excess material is discharged from the overflow opening, so that the liquid level in the housing 1 can be maintained at the working level E during production.
An alkali liquor feeding coil 5 and a magnesium salt solution feeding coil 6 are also arranged in the shell 1 and are used for adding sodium hydroxide solution and magnesium chloride solution into the shell 1. The sodium hydroxide solution is 32% caustic soda liquid from a sodium chloride electrolysis production line, and the magnesium chloride solution is prepared by magnesium chloride hexahydrate obtained by purifying salt lake tail salt. The alkali liquor feeding coil pipe 5 is communicated with an alkali liquor feeding hole 111 through an alkali liquor guide pipe 51, and the magnesium salt solution feeding coil pipe 6 is communicated with a magnesium salt solution feeding hole 112 through a magnesium salt solution guide pipe 61. The alkali liquor guide pipe 51 and the magnesium salt solution guide pipe 61 are respectively provided with an alkali liquor valve and a magnesium salt solution valve (not shown).
An annular support cylinder 7 is provided below the housing 1 for providing support. The annular supporting cylinder is provided with a supporting cylinder outlet (not shown in the figure) communicated with the discharge hole of the shell 1 through a discharge pipeline for discharging, and is also provided with a manhole 71, and a worker can enter the manhole 71 to overhaul equipment.
The basic shape and positional relationship of the top cover 11, the guide cylinder 2, the center cylinder 3, the down-pressure stirring paddle 4, and the magnesium salt solution feeding coil 6 of the alkali solution feeding coil 5 will be described below with reference to fig. 1 and 2.
As shown in fig. 1, the guide cylinder 2 is sleeved outside the central cylinder 3, and the central cylinder 3 is sleeved outside the downward-pressure stirring paddle 4.
As shown in fig. 2, the upper end height a of the guide cylinder 2 is higher than the upper end E of the annular flap 131, and the upper end height B of the center cylinder 3 is lower than the upper end E of the annular flap 131. That is, in production, the upper end of the guide cylinder 2 is located above the working liquid level e, and the upper end of the center cylinder 3 is located below the working liquid level e.
As seen in connection with fig. 1 and 2, the area between the guide cylinder 2 and the central cylinder 3 below the upper end E of the annular flap 131 serves as the guide channel 10, and the area inside the central cylinder 3 below the upper end E of the annular flap 131 serves as the mixing area 20. The outside of the central cylinder 3 in the horizontal direction forms a still water zone 30 and the lower side forms a sedimentation zone 40.
The blades 41 of the down-pressure stirrer 4 are located in the mixing region 20 at a distance from the bottom of the housing 1. An alkali liquor feeding coil pipe 5 is arranged at the upper part of the mixing area 20, and a magnesium salt solution feeding coil pipe 6 is arranged at the upper part of the diversion channel 10. The alkali liquor feeding port 111 and the magnesium salt solution feeding port 112 which are arranged on the top cover 11 correspond to the positions of the alkali liquor guide pipe 51 and the magnesium salt solution guide pipe 61 respectively, the position of the top cover 11, which corresponds to the upper part of the diversion channel 10, is provided with a pH measuring port 113 for being inserted into a pH meter, the upper part of the outer side of the corresponding diversion cylinder 2 is provided with a temperature measuring port 114 for being inserted into a thermometer, and a worker can control the process according to the measured values of the pH meter and the thermometer.
The lower end height C of the guide cylinder 2 is higher than the lower end height D of the central cylinder 3, i.e. the lower end of the guide channel 10 forms an opening 101 facing away from the central axis L0 of the housing 1.
Fig. 3 is a process explanatory diagram of the DTB-type reactive crystallizer, and a process performed in the DTB-type reactive crystallizer is explained below with reference to fig. 3.
When the device is started, the down-pressing stirring paddle 4 is started, then the magnesium salt solution valve and the alkali liquor valve are started in sequence, and magnesium chloride solution and sodium hydroxide solution are added into the shell 1 through the magnesium salt solution feeding coil 6 and the alkali liquor feeding coil 5 to reach the working liquid level e.
The liquid material flows in the direction shown by the thick arrow in fig. 3: the liquid in the mixing zone 20 flows downward to the sedimentation zone 40 under agitation by the down-pressure type agitating blade 4. The liquid at the upper part of the sedimentation area 40 and the lower part of the still water area 30 enters the diversion channel 10 from the opening 101 and flows upwards, flows into the central cylinder 3 at the top of the diversion channel 10, and forms a liquid circulation.
In the process of liquid circulation, the magnesium chloride solution added by the magnesium salt solution feeding coil pipe 6 flows along with the liquid circulation, flows from the upper end of the material guiding channel 10 to the upper end of the central cylinder 3, downwards enters the mixing area 20, and is mixed with the sodium hydroxide solution added by the alkali liquor feeding coil pipe 5 in the mixing area 20 to generate chemical reaction to generate magnesium hydroxide small particles.
The magnesium hydroxide small particles circulate and grow along with the liquid, and gradually become magnesium hydroxide large particles. The magnesium hydroxide large particles can be settled after entering the settling area 40 along with the circulation of the liquid, are accumulated at the bottom of the settling area 40, do not flow along with the circulation of the liquid any more, and are finally discharged from the discharge hole 12.
Because the shapes of the alkali liquor feeding coil pipe 5 and the magnesium salt solution feeding coil pipe 6 are matched with the shapes of the material guide channel 10 and the mixing area 20, ions in the magnesium chloride solution and the sodium hydroxide solution are mixed under the carrying of liquid circulation, the uniform reaction can be realized, and the generated magnesium hydroxide crystals have uniform particle size and can not be agglomerated.
As shown in fig. 1, the shape of the guide cylinder 2 narrows downwards, the lower part forms an inverted cone 21 with an open bottom, i.e. the opening 101 is narrower compared to the guide channel. The inverted cone portion 21 and the smaller opening 101 can play a role of shielding most of magnesium hydroxide large particles, prevent the magnesium hydroxide large particles from returning to the liquid circulation to continue growing and becoming large, and further ensure the uniformity of the particle size of magnesium hydroxide crystals.
Fig. 4 is an explanatory view of the shape of the alkali solution feeding coil and the magnesium salt solution feeding coil, fig. 5 is an enlarged view of a part of fig. 4, and the shape and structure of the alkali solution feeding coil and the magnesium salt solution feeding coil are explained below with reference to fig. 1, fig. 2, fig. 4, and fig. 5.
As shown in fig. 4 and 5, fig. 4 shows the overall shape of the lye feeding coil 5 (magnesium salt solution feeding coil 6), and fig. 5 shows the specific shape thereof. The alkali liquor feeding coil pipe 5 and the magnesium salt solution feeding coil pipe 6 are horizontally arranged annular pipes, and a plurality of through holes are uniformly formed in the lower pipe wall of the annular pipes and serve as discharge holes 50 (60). The sodium hydroxide solution and the magnesium chloride solution which enter the alkali liquor feeding coil pipe 5 and the magnesium salt solution feeding coil pipe 6 uniformly flow out of each discharging hole 50 (60) by self gravity, and are not accumulated in the pipe.
As shown in fig. 1 and 2, the height F of the magnesium salt solution feeding coil 6 is close to the upper end of the central cylinder 3, so that ions in the magnesium chloride solution can enter the central cylinder 3 along with the circulation of the liquid. Compared with the magnesium salt solution feeding coil pipe 6, the height G of the alkali liquor guide pipe 51 is lower, the distance between the alkali liquor feeding coil pipe 5 and the magnesium salt solution feeding coil pipe 6 is kept, and the contact of ions in the solution due to too close distance between the alkali liquor feeding coil pipe 5 and the magnesium salt solution feeding coil pipe 6 is prevented, so that the chemical reaction is uneven, and the particle size distribution of the generated magnesium hydroxide crystals is uneven.
The specific shape and size of the DTB-type reaction crystallizer are as follows: the housing 1 is 9 meters high and 9 meters in diameter. The inner diameter of the guide cylinder is 3.2 m, the height is 4 m, the distance between the lower end and the bottom of the inner side of the shell 1 is 3.9 m, the inner diameter of the center cylinder is 2.0 m, the height is 5.6 m, and the distance between the lower end and the bottom of the inner side of the shell 1 is 1.6 m. The diameter of the blade 41 of the down-pressure type stirring paddle 4 is 1.8 m, and the distance between the blade 41 and the bottom of the inner side of the shell 1 is 3.3 m. The down-pressure type stirring paddle 4 is an axial flow type three-blade paddle, and the diameter of the shaft 42 of the down-pressure type stirring paddle 4 is 0.25 meter. Through production tests, the DTB type reaction crystallizer with the specification can produce magnesium hydroxide products with evenly distributed particle sizes, the purity of the magnesium hydroxide is more than 99 percent, and the particle size D50 of the magnesium hydroxide is as follows: 30 microns.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Claims (10)
1. The DTB type reaction crystallizer for producing high-purity magnesium hydroxide comprises a shell (1), a guide cylinder (2), a central cylinder (3) and a down-pressing stirring paddle (4), wherein the shell (1) is a closed container sealed by a top cover (11), the upper part is cylindrical, the lower part is in an inverted cone shape, the bottom part forms an arc surface and is provided with a discharge hole (12), the guide cylinder (2), the central cylinder (3) and the down-pressing stirring paddle (4) are arranged inside the shell (1), the central axes of the shell (1), the guide cylinder (2), the central cylinder (3) and the down-pressing stirring paddle (4) are coincident, the top cover (11) is provided with an alkali liquor feed inlet (111) and a magnesium salt solution feed inlet (112),
it is characterized in that the method comprises the steps of,
an annular folded plate (131) is arranged at the upper part of the inner wall of the shell (1) to form an overflow groove (13), an overflow port (132) is formed at the lower part of the shell (1) corresponding to the overflow groove (13),
the guide cylinder (2) is sleeved outside the central cylinder (3), the first height (A) of the upper end of the guide cylinder (2) is higher than the upper end (E) of the annular folded plate (131),
the central cylinder (3) is sleeved outside the downward-pressing stirring paddle (4), the second height (B) of the upper end of the central cylinder (3) is lower than the upper end (E) of the annular folded plate (131),
the lower end height C of the guide cylinder (2) is higher than the lower end height D of the center cylinder (3),
the area between the guide cylinder (2) and the central cylinder (3) lower than the upper end (E) of the annular folded plate (131) is used as a guide channel (10), the area inside the central cylinder (3) lower than the upper end (E) of the annular folded plate (131) is used as a mixing area (20),
the blades (41) of the downward-pressure stirring paddle (4) are positioned in the mixing area (20) and keep a distance from the bottom of the shell (1),
also comprises an alkali liquor feeding coil pipe (5) and a magnesium salt solution feeding coil pipe (6),
the alkali liquor feeding coil pipe (5) and the magnesium salt solution feeding coil pipe (6) are horizontally arranged annular pipes, a plurality of through holes are uniformly formed on the pipe wall of the annular pipes as discharging holes,
the alkali liquor feeding coil pipe (5) is arranged at the upper part of the mixing area (20) and is communicated with the alkali liquor feeding port (111) through an alkali liquor guide pipe (51),
the magnesium salt solution feeding coil pipe (6) is positioned at the upper part of the diversion channel (10) and is communicated with the magnesium salt solution feeding port (112) through a magnesium salt solution guiding pipe (61).
2. The DTB-type reaction crystallizer as recited in claim 1, wherein the discharge holes on the alkali liquor feeding coil (5) and the magnesium salt solution feeding coil (6) are respectively positioned on the lower side tube walls of the alkali liquor feeding coil (5) and the magnesium salt solution feeding coil (6).
3. DTB-type reaction crystallizer as in claim 2, characterized in that the third level (F) of the magnesium salt solution feed coil (6) is close to the upper end of the central cylinder, the fourth level (G) of the lye guide tube (51) being lower than the third level (F) of the magnesium salt solution feed coil (6).
4. A DTB-type reaction crystallizer as claimed in any one of claims 1 to 3, characterized in that the shape of the guide cylinder (2) is narrowed downwards, and an inverted cone (21) with an opening at the bottom is formed at the lower part.
5. The DTB-type reaction crystallizer as recited in claim 4, wherein the housing (1) is supported by an annular support cylinder (7) provided with a support cylinder outlet and a manhole (71) which are communicated with a discharge port of the housing (1) through a discharge pipe.
6. DTB-type reaction crystallizer as in claim 5, characterized in that the top cover (11) is provided with a pH measuring port (113) for inserting a pH meter, the pH measuring port (113) being located above the diversion channel (10).
7. DTB-type reaction crystallizer as in claim 6, characterized in that the top cover (11) is provided with a temperature measuring port (114) for inserting a thermometer, the temperature measuring port (114) being located above the outside of the guide cylinder (2).
8. The DTB-type reactive crystallizer as recited in any one of claims 5 to 7, characterized in that the shell (1) is 9 m high and 9 m in diameter,
the inner diameter of the guide cylinder (2) is 3.2 meters, the height is 4 meters, the lower end is 3.9 meters away from the bottom of the inner side of the shell (1),
the inner diameter of the central cylinder (3) is 2.0 m, the height is 5.6 m, the lower end is 1.6 m away from the bottom of the inner side of the shell (1),
the diameter of the blade 41 of the downward-pressure stirring paddle (4) is 1.8 meters, and the distance between the blade 41 and the bottom of the inner side of the shell (1) is 3.3 meters.
9. DTB-type reaction crystallizer as in claim 8, characterized in that the down-flow stirrer (4) is an axial-flow three-blade propeller, the shaft (42) of the down-flow stirrer (4) being 0.25 m in diameter.
10. DTB-type reaction crystallizer as in claim 9, characterized in that the top cover (11) is provided with a pH adjustment port, which is located above the mixing zone (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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