CN219950506U - Preparation system of superfine tungsten trioxide - Google Patents
Preparation system of superfine tungsten trioxide Download PDFInfo
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- CN219950506U CN219950506U CN202321095544.1U CN202321095544U CN219950506U CN 219950506 U CN219950506 U CN 219950506U CN 202321095544 U CN202321095544 U CN 202321095544U CN 219950506 U CN219950506 U CN 219950506U
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- ZNOKGRXACCSDPY-UHFFFAOYSA-N tungsten trioxide Chemical compound O=[W](=O)=O ZNOKGRXACCSDPY-UHFFFAOYSA-N 0.000 title claims abstract description 189
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 19
- 238000007873 sieving Methods 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 abstract description 10
- XAYGUHUYDMLJJV-UHFFFAOYSA-Z decaazanium;dioxido(dioxo)tungsten;hydron;trioxotungsten Chemical compound [H+].[H+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O XAYGUHUYDMLJJV-UHFFFAOYSA-Z 0.000 description 30
- 238000002425 crystallisation Methods 0.000 description 20
- 230000008025 crystallization Effects 0.000 description 20
- 238000000034 method Methods 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 15
- 238000003756 stirring Methods 0.000 description 12
- 239000013078 crystal Substances 0.000 description 11
- 238000001354 calcination Methods 0.000 description 10
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000000843 powder Substances 0.000 description 7
- 239000002253 acid Substances 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 5
- 238000000605 extraction Methods 0.000 description 5
- 238000000227 grinding Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000010298 pulverizing process Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- QCJQWJKKTGJDCM-UHFFFAOYSA-N [P].[S] Chemical compound [P].[S] QCJQWJKKTGJDCM-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 238000010532 solid phase synthesis reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The utility model discloses a preparation system of superfine tungsten trioxide, which relates to the technical field of tungsten trioxide preparation and comprises the following steps: an APT bin (1), a calciner (2), a tungsten trioxide bin (3), a sieving machine (4) and an air mill (5) which are sequentially arranged along the feeding direction; wherein the calciner (2) comprises at least 3 heating zones. A material collecting device (6) is connected to the discharge port of the jet mill (5); wherein the air flow mill (5) comprises an air flow crushing bin, the bottom of the air flow crushing bin is connected with an air supply system for providing high-pressure air, and a discharge hole of the air flow crushing bin is connected with a material collecting device (6) through a pipeline. The preparation system of the utility model adopts a calciner, a sieving machine and an air flow mill which at least comprise three heating sections in sequence, solves the problem of coarse tungsten trioxide particles of the traditional equipment, and prepares the superfine tungsten trioxide.
Description
Technical Field
The utility model relates to the technical field of tungsten trioxide preparation, in particular to a preparation method and a system of superfine tungsten trioxide.
Background
Tungsten trioxide has high density, high melting point, high hardness, high wear resistance, low thermal expansion coefficient, excellent electric conduction and heat conduction properties and good corrosion resistance, and meanwhile, has semiconductor characteristics, is a potential sensitive material and is sensitive to various gases. Besides the characteristics, the superfine tungsten trioxide has larger specific surface area, obvious surface effect and strong electromagnetic wave absorption capacity, and can be used as an excellent solar energy absorption material and an invisible material for the battery industry. In addition, tungsten trioxide has special catalytic performance and has wide application in chemical industry and petrochemical industry.
At present, a plurality of methods for preparing tungsten trioxide are available, and common preparation methods comprise a gas phase method, a liquid phase method (including a precipitation method, a hydrothermal method, a sol-gel method and the like) and a solid phase method, and the methods have the defects of low production rate, high cost, difficult control of production and the like.
Disclosure of Invention
The utility model aims to at least solve one of the technical problems in the prior art and provides a preparation method of superfine tungsten trioxide.
The technical scheme of the utility model is as follows:
in order to solve the problems in the prior art, the utility model provides the preparation method of the superfine tungsten trioxide, other auxiliary materials are not required to be added in the production process, the production process is mature and easy to control, and the cost is low.
Therefore, the utility model provides a preparation method of superfine tungsten trioxide, which comprises the following steps:
the preparation method of the superfine tungsten trioxide comprises the following steps:
step S1: calcining the ammonium paratungstate crystal to obtain tungsten trioxide powder;
wherein the calcination comprises at least 3 progressively higher temperature segments;
and S2, physically crushing the tungsten trioxide powder obtained in the step S1 to obtain superfine tungsten trioxide powder.
As a preferred embodiment of the present utility model, in step S1, the preparation method of the ammonium paratungstate crystal comprises: evaporating and crystallizing the high-purity ammonium tungstate solution to obtain ammonium paratungstate crystals;
the evaporation and crystallization are carried out while stirring, the stirring rotation speed is 90-110r/min for 1-3h before crystallization, and the stirring rotation speed is 60-89r/min after 1-3 h.
As a preferred embodiment of the present utility model, the end point crystallization rate of the evaporative crystallization is 85 to 95%.
As a preferable scheme of the utility model, the high-purity ammonium tungstate solution is produced by at least one production process of an ion exchange process, an acid extraction process, an alkaline extraction process and a sulfur-phosphorus mixed acid process.
As a preferred embodiment of the present utility model, in step S1, the at least 3 gradually increasing temperature segments are specifically:
the temperature of the first temperature control area is 250-450 ℃, and the temperature of the second temperature control area is 400-600 ℃; the temperature of the third temperature control zone is 600-800 ℃.
As a preferred embodiment of the present utility model, in step S1, the at least 3 gradually increasing temperature segments are specifically:
the temperature of the first temperature control area is 200-300 ℃, and the temperature of the second temperature control area is 300-400 ℃; the temperature of the third temperature control zone is 450-600 ℃; the temperature of the fourth temperature control zone is 650-800 ℃.
As a preferred embodiment of the present utility model, in step S1, the at least 3 gradually increasing temperature segments are specifically:
the temperature of the first temperature control area is 250-350 ℃, and the temperature of the second temperature control area is 350-450 ℃; the temperature of the third temperature control zone is 450-550 ℃; the temperature of the fourth temperature control zone is 550-650 ℃; the temperature of the fifth temperature control zone is 650-800 ℃.
As a preferred embodiment of the present utility model, in step S1, the at least 3 gradually increasing temperature segments are specifically:
the temperature of the first temperature control area is 250-300 ℃, and the temperature of the second temperature control area is 300-400 ℃; the temperature of the third temperature control zone is 450-600 ℃; the temperature of the fourth temperature control zone is 550-700 ℃; the temperature of the fifth temperature control zone is 600-750 ℃; the temperature of the sixth temperature control zone is 650-800 ℃.
As a preferred scheme of the utility model, in the step S1, the calcination is carried out in a calciner, and the rotating speed of a calciner furnace tube is 1.8-2.7r/min.
As a preferred embodiment of the present utility model, in step S2, the physical crushing method includes: grinding and/or air-stream disruption.
The utility model also provides the superfine tungsten trioxide obtained by any one of the preparation methods, and the average grain diameter of the superfine tungsten trioxide is 0.5-1.0 mu m
The utility model also discloses a preparation system of the superfine tungsten trioxide, which comprises the following steps: an APT bin, a calciner, a tungsten trioxide bin, a sieving machine and an air mill which are sequentially arranged along the feeding direction; wherein the calciner comprises at least 3 heating zones.
Preferably, a material collecting device is connected to the discharge port of the jet mill;
the air flow grinding device comprises an air flow crushing bin, wherein the bottom of the air flow crushing bin is connected with an air supply system for providing high-pressure air, and a discharge hole of the air flow crushing bin is connected with a material collecting device through a pipeline.
The beneficial effects of the utility model are as follows:
(1) The preparation method disclosed by the utility model does not need to add auxiliary materials in the whole process, so that the production cost is reduced, and meanwhile, the product disqualification caused by incomplete auxiliary material treatment can be avoided.
(2) The utility model has stable production process, high production efficiency and stable product quality.
(3) According to the utility model, tungsten trioxide with small original particle size is produced by adjusting the crystallization process, the crystallization rate, the heating temperature in the calcination process and the rotation speed of the furnace tube, and the tungsten trioxide with the average particle size of 0.5-1.0 mu m can be produced after physical crushing, so that a high-quality superfine tungsten trioxide material is provided for the tungsten industry.
(4) The preparation system of the utility model adopts a calciner, a sieving machine and an air flow mill which at least comprise three heating sections in sequence, solves the problem of coarse tungsten trioxide particles of the traditional equipment, and prepares the superfine tungsten trioxide.
Drawings
FIG. 1 is a schematic diagram of a system for preparing ultrafine tungsten trioxide according to the present utility model;
FIG. 2 is a schematic view of the calciner of the present utility model;
FIG. 3 is a schematic diagram of a calciner according to the present utility model;
FIG. 4 is a schematic diagram of a calciner according to the utility model;
FIG. 5 is a schematic diagram of a calciner according to the present utility model;
FIG. 6 is a photograph of a tungsten trioxide electron microscope generated by APT calcination in example 5;
FIG. 7 is a photograph of an ultra fine tungsten trioxide electron microscope in example 5;
FIG. 8 is a photograph of a tungsten trioxide electron microscope generated by APT calcination in example 6;
FIG. 9 is a photograph of an ultra fine tungsten trioxide electron microscope in example 6.
In the figure, a 1-APT feed bin, a 2-calciner, 201-a first heating section, 202-a second heating section, 203-a third heating section, 204-a fourth heating section, 205-a fifth heating section, 206-a sixth heating section, a 3-tungsten trioxide feed bin, a 4-sieving machine, a 5-air flow mill, a 6-material collecting device and a 7-maintenance window.
Detailed Description
A method for preparing ultrafine tungsten trioxide, which comprises the following steps:
adding the high-purity ammonium tungstate solution into an evaporation crystallization pot, and then starting a stirring paddle and steam to obtain Ammonium Paratungstate (APT) crystals; specifically, the evaporation crystallization pot is an intermittent evaporation crystallization pot; the stirring speed of the stirring paddle is 60-110r/min. Wherein the rotation speed of the stirring paddle is 90-110r/min for two hours before crystallization, and in the step S1, the rotation speed of the stirring paddle is 60-89r/min after two hours of crystallization. The crystallization rate at the crystallization end point is 85-95%. The high-purity ammonium tungstate solution is produced by an ion exchange process, an acid extraction process, an alkaline extraction process and a sulfur-phosphorus mixed acid process.
Calcining the obtained APT crystal by a calciner to obtain tungsten trioxide powder; wherein the calciner is a rotary kiln, and the rotating speed of the furnace tube of the rotary kiln is 1.8-2.7r/min. The calciner contains at least 3 temperature control zones:
the temperature of the first temperature control area is 250-450 ℃, and the temperature of the second temperature control area is 400-600 ℃; the temperature of the third temperature control zone is 600-800 ℃;
still other embodiments: the temperature of the first temperature control area is 200-300 ℃, and the temperature of the second temperature control area is 300-400 ℃; the temperature of the third temperature control zone is 450-600 ℃; the temperature of the fourth temperature control zone is 650-800 ℃;
still other embodiments: the temperature of the first temperature control area is 250-350 ℃, and the temperature of the second temperature control area is 350-450 ℃; the temperature of the third temperature control zone is 450-550 ℃; the temperature of the fourth temperature control zone is 550-650 ℃; the temperature of the fifth temperature control zone is 650-800 DEG C
Still other embodiments: the temperature of the second temperature control zone is 300-400 ℃; the temperature of the third temperature control zone is 450-600 ℃; the temperature of the fourth temperature control zone is 550-700 ℃; the temperature of the fifth temperature control zone is 600-750 ℃; the temperature of the sixth temperature control zone is 650-800 ℃.
And S3, physically crushing the tungsten trioxide powder obtained in the step 2 to obtain superfine tungsten trioxide powder. Specifically, the physical crushing method comprises the following steps: grinding and/or air-stream disruption.
In still another preferred embodiment, the above-mentioned ultra-fine tungsten trioxide preparing system is as follows, referring to fig. 1-5;
a preparation system of superfine tungsten trioxide, comprising: an APT feed bin 1, a calciner 2, a tungsten trioxide feed bin 3, a sieving machine 4 and an air mill 5 which are sequentially arranged along the feeding direction; the calciner 2 comprises at least 3 sections of heating sections, specifically, a first heating section 201, a second heating section 202, a third heating section 203, a fourth heating section 204, a fifth heating section 205 and a sixth heating section 206 can be arranged at different temperatures in different heating sections to adapt to the process requirements, and the formation of superfine tungsten trioxide is facilitated.
Specifically, a material collecting device 6 is connected to a discharge port of the jet mill 5; more specifically, the material collecting device 6 is a cloth bag dust collector, and an overhaul window 7 is arranged on the cloth bag dust collector, so that the condition in the tank can be conveniently and timely overhauled.
Wherein the jet mill 5 comprises a jet crushing bin which is connected with the material collecting device 6 through a pipeline, and the bottom of the jet crushing bin is connected with a gas supply system for supplying high-pressure air so as to crush the materials. The tungsten trioxide is ground by adopting the air flow mill 5, so that the tungsten trioxide is more uniform.
The technical scheme of the utility model is further described in the following specific examples.
APT: ammonium paratungstate.
Example 1
Placing the APT in a rotary furnace, and controlling the temperature to be as follows: the tungsten trioxide is obtained through sieving at 300 ℃ in a first temperature control area, 500 ℃ in a second temperature control area and 700 ℃ in a third temperature control area and the rotating speed of a furnace tube of 1.8 r/min; the superfine tungsten trioxide is obtained after grinding the tungsten trioxide.
Example 2
Placing the APT in a rotary furnace, and controlling the temperature to be as follows: the tungsten trioxide is obtained through sieving at 300 ℃ in a first temperature control area, 450 ℃ in a second temperature control area, 600 ℃ in a third temperature control area, 750 ℃ in a fourth temperature control area and 2.5r/min of furnace tube rotation speed; the superfine tungsten trioxide is obtained after the tungsten trioxide is crushed by air flow.
Example 3
Placing the APT in a rotary furnace, and controlling the temperature to be as follows: the tungsten trioxide is obtained through sieving, wherein the temperature of the first temperature control area is 250 ℃, the second temperature control area is 350 ℃, the third temperature control area is 500 ℃, the fourth temperature control area is 650 ℃, the fifth temperature control area is 750 ℃, and the rotating speed of the furnace tube is 2.2 r/min; the superfine tungsten trioxide is obtained after the tungsten trioxide is crushed by air flow.
Example 4
Placing the APT in a rotary furnace, and controlling the temperature to be as follows: the tungsten trioxide is obtained by sieving at 250 ℃ in a first temperature control area, 350 ℃ in a second temperature control area, 500 ℃ in a third temperature control area, 650 ℃ in a fourth temperature control area, 700 ℃ in a fifth temperature control area, 750 ℃ in a sixth temperature control area and 2.5r/min of furnace tube rotation speed; the superfine tungsten trioxide is obtained after the tungsten trioxide is crushed by air flow.
Example 5
Placing the APT in a rotary furnace, and controlling the temperature to be as follows: the tungsten trioxide is obtained by sieving at the temperature of 250 ℃ in the first temperature control area, 380 ℃ in the second temperature control area, 520 ℃ in the third temperature control area, 680 ℃ in the fourth temperature control area, 720 ℃ in the fifth temperature control area, 780 ℃ in the sixth temperature control area and 2.2r/min of the furnace tube rotation speed; the superfine tungsten trioxide is obtained after the tungsten trioxide is crushed by air flow.
The tungsten trioxide after calcination and air-stream pulverization of this example was subjected to electron microscopic scanning, respectively, and referring to fig. 6 and 7, it can be seen from fig. 1 that the tungsten trioxide after APT was calcined was composed of a plurality of grains into tungsten trioxide crystals, the individual grains were each smaller than 1 μm in size and closely connected to each other, and each grain was basically dispersed to form individual minute nanoscale crystals after air-stream pulverization of the tungsten trioxide of fig. 6.
Example 6
Placing ammonium tungstate solution (the detection result is shown in table 1) produced by acid extraction into an intermittent crystallization pot, controlling the stirring paddle speed to be 90r/min in two hours before crystallization, controlling the stirring paddle speed to be 60r/min after two hours, and controlling the crystallization rate to be 85% to prepare APT; placing the APT in a rotary furnace, and controlling the temperature to be as follows: the tungsten trioxide is obtained by sieving at the temperature of 250 ℃ in the first temperature control area, 300 ℃ in the second temperature control area, 450 ℃ in the third temperature control area, 550 ℃ in the fourth temperature control area, 600 ℃ in the fifth temperature control area and 650 ℃ in the sixth temperature control area and the rotating speed of the furnace tube of 1.8 r/min; the tungsten trioxide is obtained after grinding.
TABLE 1 detection results (g/l) of acid extracted ammonium tungstate solution
| Name of the name | WO 3 | Mo | P | SiO 2 | Na |
| Ammonium tungstate solution | 277.8 | 0.023 | 0.022 | 0.20 | 0.01 |
The tungsten trioxide after calcination and air-stream pulverization of this example was subjected to electron microscope scanning, respectively, and referring to fig. 8 and 9, it can be seen from fig. 1 that the tungsten trioxide after APT was calcined was composed of a plurality of grains into tungsten trioxide crystals, the grain sizes of the individual grains were all smaller than 1 μm, and the grains were closely connected, and the ultrafine tungsten trioxide powder of fig. 9 was produced by air-stream pulverization of the tungsten trioxide of fig. 8, and the grains were basically dispersed to form individual fine nano-sized crystals.
Comparative example 1
Placing the APT in a rotary furnace, and controlling the temperature to be as follows: the tungsten trioxide is obtained through sieving at 300 ℃ in the first temperature control area, 500 ℃ in the second temperature control area and 700 ℃ in the third temperature control area and the rotating speed of the furnace tube of 1.8 r/min.
Comparative example 2
Placing the APT in a rotary furnace, and controlling the temperature to be as follows: the rotation speed of the furnace tube is 1.8r/min at 750 ℃, and the tungsten trioxide is obtained through sieving; the tungsten trioxide is obtained after the tungsten trioxide is crushed by air flow.
Comparative example 3
Placing the APT in a rotary furnace, and controlling the temperature to be as follows: the tungsten trioxide is obtained through sieving at 350 ℃ in a first temperature control area and at 750 ℃ in a second temperature control area and with the rotating speed of a furnace tube of 1.8 r/min; the tungsten trioxide is obtained after the tungsten trioxide is crushed by air flow.
Comparative example 4
Placing the APT in a rotary furnace, and controlling the temperature to be as follows: the tungsten trioxide is obtained through sieving at 750 ℃ in a first temperature control area, 650 ℃ in a second temperature control area and 550 ℃ in a third temperature control area and the rotating speed of a furnace tube of 1.8 r/min; the tungsten trioxide is obtained after the tungsten trioxide is crushed by air flow.
Comparative example 5
Placing the APT in a rotary furnace, and controlling the temperature to be as follows: the tungsten trioxide is obtained through sieving at 750 ℃ in a first temperature control area, 700 ℃ in a second temperature control area, 650 ℃ in a third temperature control area, 550 ℃ in a fourth temperature control area and 1.8r/min of furnace tube rotation speed; the tungsten trioxide is obtained after the tungsten trioxide is crushed by air flow.
Comparative example 6
Placing the APT in a rotary furnace, and controlling the temperature to be as follows: the tungsten trioxide is obtained through sieving at 300 ℃ in a first temperature control area, 500 ℃ in a second temperature control area and 700 ℃ in a third temperature control area and the rotating speed of a furnace tube of 1.5 r/min; the tungsten trioxide is obtained after the tungsten trioxide is crushed by air flow.
The samples of the above examples and comparative examples were subjected to an average particle diameter test, and the test results are shown in table 1.
Table 2 average particle diameter of examples and comparative examples
| Project | Average particle diameter (D50) |
| Example 1 | 0.705μm |
| Example 2 | 0.635μm |
| Example 3 | 0.601μm |
| Example 4 | 0.615μm |
| Example 5 | 0.628μm |
| Example 6 | 0.512μm |
| Comparative example 1 | 53.2μm |
| Comparative example 2 | 1.68μm |
| Comparative example 3 | 1.78μm |
| Comparative example 4 | 1.69μm |
| Comparative example 5 | 1.95μm |
| Comparative example 6 | 1.58μm |
As can be seen from the above table, the tungsten trioxide prepared in examples 1-6 has an average particle size of 0.5-1 μm, i.e., a nano-scale, which is superior to comparative examples 1-6, and is probably because rapid stirring can rapidly generate a large number of crystal nuclei at the initial stage of evaporation crystallization, and the reduction of stirring speed at the later stage of crystallization reduces growth of solutes on the existing crystal nuclei with the decrease of supersaturation of the solution, thereby producing fine-grained APT. When APT is decomposed at a slightly low temperature and water vapor and ammonia overflow from the inside of particles, a large amount of microcracks are formed in the particles, ammonia and water generated by the too high temperature rise are not easy to volatilize out rapidly, so that the cracking of APT is hindered, and fine-particle tungsten trioxide cannot be produced. Therefore, the utility model produces tungsten trioxide with small original grain diameter by adjusting the crystallization process, the crystallization rate, the heating temperature in the calcination process and the rotation speed of the furnace tube, and can produce tungsten trioxide with the average grain diameter of 0.5-1.0 mu m after physical crushing, thereby providing a high-quality superfine tungsten trioxide material for tungsten industry.
The foregoing examples have shown only the preferred embodiments of the utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model. It should be pointed out that various other corresponding changes and modifications can be made by those skilled in the art in light of the above description of the technical solution and the idea, and all such changes and modifications are intended to be within the scope of the utility model as defined in the appended claims.
Claims (2)
1. A system for preparing ultrafine tungsten trioxide, comprising: an APT bin (1), a calciner (2), a tungsten trioxide bin (3), a sieving machine (4) and an air mill (5) which are sequentially arranged along the feeding direction; wherein the calciner (2) comprises at least 3 heating zones.
2. The preparation system of superfine tungsten trioxide according to claim 1, characterized in that a material collecting device (6) is connected to a discharge port of the jet mill (5);
wherein the air flow mill (5) comprises an air flow crushing bin, the bottom of the air flow crushing bin is connected with an air supply system for providing high-pressure air, and a discharge hole of the air flow crushing bin is connected with a material collecting device (6) through a pipeline.
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| CN116282175B (en) * | 2023-05-09 | 2024-07-05 | 江钨世泰科钨品有限公司 | Preparation method and system of superfine tungsten trioxide |
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