A continuous nano powder deacidification device

Abstract

The present invention relates to the field of deacidification technology, and in particular to a continuous nano powder deacidification device. The present invention provides a continuous nano powder deacidification device, which includes from left to right: a gas inlet 1, a blower 2, a heater 3, a venturi conveyor 4, a nozzle 5 and a cyclone deacidifier 6; the gas inlet 1, the blower 2, the heater 3, the venturi conveyor 4 and the nozzle 5 are all connected by pipelines; the nozzle 5 and the cyclone deacidifier 6 are in abutment connection. Mixing and feeding through the venturi conveyor ensures that the powder is fully mixed with the high-temperature gas, which solves the problem of uneven heating due to the heat insulation effect of the powder; secondly, through the cyclone deacidifier, it is ensured that the material and the high-temperature gas have sufficient residence time after entering the deacidifier, which greatly reduces the volume of the deacidification equipment and realizes the continuous feeding and discharging mode, thereby realizing the continuous production of nano powder deacidification.

Description

Technical Field

[0001] The invention relates to the technical field of deacidification technology, and in particular to a continuous nano powder deacidification device. Background Art

[0002] Since the nano powder produced by the gas phase method has the characteristics of small primary particle size, large specific surface area, and low bulk density, and its superior charging, reinforcement, thickening and wear resistance, it is widely used in many fields such as coatings, rubber, ceramics, and chemicals. Hydrogen chloride is attached to the surface of the gas phase powder. For example, the pH value of the gas phase alumina dispersion with a mass fraction of 4% is 3.5-5.5, which has strong acidity. During the gas phase preparation process, the by-product HCl is inevitably adsorbed on the surface of the alumina powder in various forms, resulting in a low pH value of the product, which affects the application field of the product. Therefore, deacidification is an important link in the production of gas phase alumina powder, which plays a key role in affecting the final quality and performance of the product.

[0003] Common deacidification methods include hot air plus alcohol method, hot air plus amine method, dry hot air method, moist hot air method, reduced pressure vibration fluidization method, etc. However, most of the deacidification devices reported in China are designed for white carbon black deacidification. The deacidification principle is to use high-temperature airflow to blow the material to form a boiling fluidization effect. The acid gas is vaporized again after heating to achieve the effect of separation from the powder. Due to fluidized deacidification, the powder is required to stay in the equipment for a sufficient time to achieve a good deacidification effect. Therefore, fluidized deacidification devices generally have difficulties in continuous feeding, and the device occupies a large area. At the same time, due to the heat insulation effect of the powder itself during the fluidization process, it is easy to cause uneven heating in some areas, affecting the final deacidification effect.

[0004] In view of the above technical problems, the present invention provides a continuous nano powder deacidification device. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a continuous nano-powder deacidification device, which includes, from left to right, a gas inlet 1, a blower 2, a heater 3, a venturi conveyor 4, a nozzle 5 and a cyclone deacidifier 6; the gas inlet 1, the blower 2, the heater 3, the venturi conveyor 4 and the nozzle 5 are all connected by a pipeline; the nozzle 5 and the cyclone deacidifier 6 are in a conflicting connection.

[0006] As a preferred technical solution of the present invention, the density of the nano powder is not higher than 250kg / m 3 .

[0007] As a preferred technical solution of the present invention, the connection mode of the pipeline is flange connection.

[0008] As a preferred technical solution of the present invention, a heat-insulating layer 9 is provided outside the pipeline.

[0009] As a preferred embodiment of the present invention, a material bin 7 is provided on the Venturi conveyor 4; the Venturi conveyor 4 and the material bin 7 are detachably connected.

[0010] As a preferred technical solution of the present invention, a valve 8 is provided at the bottom of the material bin 7 .

[0011] As a preferred technical solution of the present invention, a heat-insulating layer 9 is provided outside the cyclone deacidifier 6 .

[0012] As a preferred technical solution of the present invention, the cyclone deacidifier 6 is provided with a material outlet 10 at the top, a cyclone baffle 12 inside, and a base 11 at the bottom.

[0013] As a preferred embodiment of the present invention, the cyclone baffles 12 are equidistantly distributed on both sides of the cyclone deacidifier 6 .

[0014] As a preferred embodiment of the present invention, the spacing between the swirl baffles 12 is 30-80 cm.

[0015] Beneficial Effects

[0016] The present invention provides a continuous nano powder deacidification device to solve the problems that the deacidification device is difficult to realize continuous powder feeding, the equipment occupies a large area, and the powder is heated unevenly during the deacidification process. A large amount of air is drawn into the device through a blower 2, and after being heated by a heater 3, it is input into a venturi conveyor 4; at the same time, a valve 8 is opened to put the nano powder in the material bin 7 into the venturi conveyor 4, and the venturi conveyor 4 fully mixes the undeacidified nano powder with the high-temperature air, and then enters the cyclone deacidifier 6 through a nozzle 5. Under the action of the cyclone baffle, the mixed material moves in the cyclone deacidifier 6 in a cyclone form. During the moving process, the nano powder and the high-temperature air fully transfer heat and mass to deacidify until the pH value of the powder reaches the requirement. The device provided by the present invention uses a venturi conveyor to mix the feed material to ensure that the powder is fully mixed with the high-temperature gas, thereby solving the problem of uneven heating in some areas due to the heat insulation effect of the powder; secondly, through the cyclone deacidifier, it is ensured that the material and the high-temperature gas have sufficient residence time after entering the deacidifier, which greatly reduces the volume of the deacidification equipment; finally, by arranging a cyclone baffle inside the cyclone deacidifier, the deacidification effect is significantly improved. The deacidification device of the present invention realizes a continuous feeding and discharging mode, thereby realizing continuous deacidification production of nano powders. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the deacidification device described in Example 1;

[0018] Figure 1 The meanings of the numbers in the figures shown in are explained as follows:

[0019] 1 is a gas inlet; 2 is a blower; 3 is a heater; 4 is a venturi conveyor; 5 is a nozzle; 6 is a deacidifier; 7 is a material bin; 8 is a valve; 9 is an insulation layer; 10 is a material outlet; 11 is a base; and 12 is a swirl baffle. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0022] In this document, relational terms such as first, second, third, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or apparatus.

[0023] The present invention provides a continuous nano powder deacidification device, which comprises, from left to right, a gas inlet 1, a blower 2, a heater 3, a venturi conveyor 4, a nozzle 5 and a cyclone deacidification device 6; the gas inlet 1, the blower 2, the heater 3, the venturi conveyor 4 and the nozzle 5 are all connected by a pipeline; the nozzle 5 and the cyclone deacidification device 6 are in abutment connection.

[0024] In a preferred embodiment, the reduced diameter portion of the nozzle 5 is inserted into the cyclone deacidifier 6 .

[0025] In the present invention, the density of the nano powder is not higher than 250kg / m 3 .

[0026] In a preferred embodiment, the density of the nanopowder is not higher than 200 kg / m 3 .

[0027] In a preferred embodiment, the density of the nanopowder is not higher than 150 kg / m 3 .

[0028] In a preferred embodiment, the nano powder is selected from at least one of nano titanium dioxide, white carbon black, silicon dioxide, aluminum oxide, zirconium oxide, antimony oxide and tin oxide.

[0029] In a more preferred embodiment, the nano powder is selected from at least one of nano titanium dioxide, white carbon black and aluminum oxide.

[0030] In a more preferred embodiment, the nano powder is nano alumina produced by a gas phase method.

[0031] In the present invention, the connection mode of the pipeline is flange connection.

[0032] As the kind of flange connection, there is no particular limitation, and there may be mentioned a threaded flange, a welding flange, a loose flange and the like.

[0033] Flange connection is a detachable joint that fixes two pipes, pipe fittings or equipment on a flange plate respectively, then adds a flange gasket between the two flange plates, and finally tightens the two flange plates with bolts to make them tightly combined. It can realize the connection between static pipes and rotating or reciprocating equipment. Its main features are easy disassembly, high strength and good sealing performance.

[0034] In the present invention, a heat-insulating layer 9 is provided outside the pipeline.

[0035] In a preferred embodiment, the material of the thermal insulation layer is not particularly limited, and vacuum insulation panels and the like may be mentioned.

[0036] The inventor believes that the purpose of providing the heat-insulating layer in the present invention is to reduce the heat loss of air and nano-powders during the transportation process, so that the nano-powders are heated more evenly and the deacidification effect is improved.

[0037] In the present invention, a material bin 7 is provided on the Venturi conveyor 4; the Venturi conveyor 4 and the material bin 7 are detachably connected.

[0038] In a preferred embodiment, the detachable connection is not particularly limited and may be a flange connection or the like.

[0039] In a more preferred embodiment, a valve 8 is provided at the bottom of the material bin 7 .

[0040] In the present invention, the valve 8 is provided for the purpose of controlling the feeding amount and feeding time of the nano powder, while reducing the heat loss in the venturi conveyor and improving the deacidification effect of the nano powder in the later stage.

[0041] In the present invention, a heat-insulating layer 9 is provided outside the cyclone deacidifier 6 .

[0042] In a preferred embodiment, the cyclone deacidifier 6 is provided with a material outlet 10 at the top, a cyclone baffle 12 inside, and a base 11 at the bottom.

[0043] In the present invention, the number of the swirl baffles 12 is not particularly limited, and can be 2-20.

[0044] In a preferred embodiment, the number of the swirl baffles 12 is 6-14.

[0045] In a more preferred embodiment, the number of the swirl baffles 12 is 8.

[0046] In the present invention, the cyclone baffles 12 are equidistantly distributed on both sides of the cyclone deacidifier 6 .

[0047] In a preferred embodiment, the arrangement of the swirl baffles 12 is not particularly limited, and may be symmetrical arrangement, staggered arrangement, etc.

[0048] In the present invention, the spacing between the swirl baffles 12 is 30-80 cm.

[0049] In a preferred embodiment, the spacing between the swirl baffles 12 is 40-60 cm.

[0050] In a more preferred embodiment, the spacing between the swirl baffles 12 is 50 cm.

[0051] In the present invention, the angle between the swirl baffle 12 and the horizontal direction is 0-60°.

[0052] In a preferred embodiment, the angle between the swirl baffle 12 and the horizontal direction is 20-45°.

[0053] In a more preferred embodiment, the angle between the swirl baffle 12 and the horizontal direction is 30°.

[0054] In the present invention, the ejection speed of the nozzle 5 is 5-20 m / s.

[0055] In the present invention, the cyclone speed of the cyclone deacidifier 6 is 2-10 m / s.

[0056] In a preferred embodiment, the ejection speed of the nozzle 5 is 1.5-3 times the cyclone speed of the cyclone deacidifier.

[0057] In a more preferred embodiment, the ejection speed of the nozzle 5 is twice the cyclone speed of the cyclone deacidifier.

[0058] The present invention is described in detail below by way of examples. It is necessary to point out here that the following examples are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by professionals and technicians in this field based on the content of the present invention above still belong to the scope of protection of the present invention.

[0059] In addition, if not otherwise stated, all raw materials used were commercially available.

[0060] Example

[0061] Example 1

[0062] Embodiment 1 provides a continuous nano powder deacidification device, which includes, from left to right, a gas inlet 1, a blower 2, a heater 3, a venturi conveyor 4, a nozzle 5 and a cyclone deacidifier 6; the gas inlet 1, the blower 2, the heater 3, the venturi conveyor 4 and the nozzle 5 are all connected by a pipeline; the nozzle 5 and the cyclone deacidifier 6 are in a butt connection; the connection method of the pipeline is a flange connection; the outside of the pipeline and the cyclone deacidifier 6 is provided with an insulation layer 9; the venturi conveyor 4 is provided with a material bin 7; the venturi conveyor 4 It is detachably connected to the material bin 7; a valve 8 is provided at the bottom of the material bin 7; a material outlet 10 is provided at the top of the cyclone deacidifier 6; a base 11 is provided at the bottom of the cyclone deacidifier 6; a cyclone baffle 12 is provided inside the cyclone deacidifier 6; the number of the cyclone baffles 12 is 8, which are staggered and equidistantly distributed inside the cyclone deacidifier 6; the spacing between the cyclone baffles 12 is 50 cm; the angle between the cyclone baffles 12 and the horizontal direction is 30°; the spraying speed of the nozzle 5 is 10 m / s; the flow speed of the cyclone deacidifier 6 is 5 m / s.

[0063] Example 2

[0064] Embodiment 2 provides a continuous nano powder deacidification device, which includes, from left to right, a gas inlet 1, a blower 2, a heater 3, a venturi conveyor 4, a nozzle 5 and a cyclone deacidifier 6; the gas inlet 1, the blower 2, the heater 3, the venturi conveyor 4 and the nozzle 5 are all connected by a pipeline; the nozzle 5 and the cyclone deacidifier 6 are in a butt connection; the connection method of the pipeline is a flange connection; the outside of the pipeline and the cyclone deacidifier 6 is provided with an insulation layer 9; the venturi conveyor 4 is provided with a material bin 7; the venturi conveyor 4 It is detachably connected to the material bin 7; a valve 8 is provided at the bottom of the material bin 7; a material outlet 10 is provided at the top of the cyclone deacidifier 6; a base 11 is provided at the bottom of the cyclone deacidifier 6; a cyclone baffle 12 is provided inside the cyclone deacidifier 6; the number of the cyclone baffles 12 is 6, which are staggered and equidistantly distributed inside the cyclone deacidifier 6; the spacing between the cyclone baffles 12 is 30 cm; the angle between the cyclone baffles 12 and the horizontal direction is 20°; the ejection speed of the nozzle 5 is 5 m / s; the flow speed of the cyclone deacidifier 6 is 2 m / s.

[0065] Example 3

[0066] Embodiment 1 provides a continuous nano powder deacidification device, which includes from left to right: a gas inlet 1, a blower 2, a heater 3, a venturi conveyor 4, a nozzle 5 and a cyclone deacidifier 6; the gas inlet 1, the blower 2, the heater 3, the venturi conveyor 4 and the nozzle 5 are all connected by a pipeline; the nozzle 5 and the cyclone deacidifier 6 are in a butt connection; the connection method of the pipeline is a flange connection; the outside of the pipeline and the cyclone deacidifier 6 is provided with an insulation layer 9; the venturi conveyor 4 is provided with a material bin 7; the venturi conveyor 4 and The material bins 7 are detachably connected; a valve 8 is provided at the bottom of the material bin 7; a material outlet 10 is provided at the top of the cyclone deacidifier 6; a base 11 is provided at the bottom of the cyclone deacidifier 6; a cyclone baffle 12 is provided inside the cyclone deacidifier 6; the number of the cyclone baffles 12 is 14, which are staggered and equidistantly distributed inside the cyclone deacidifier 6; the spacing between the cyclone baffles 12 is 80 cm; the angle between the cyclone baffles 12 and the horizontal direction is 60°; the ejection speed of the nozzle 5 is 20 m / s; the flow speed of the cyclone deacidifier 6 is 10 m / s.

[0067] Example 4

[0068] The difference between Example 4 and Example 1 is that no cyclone baffle 12 is provided in the cyclone deacidifier 6 .

[0069] Example 5

[0070] The difference between Example 5 and Example 1 is that the ejection speed of the nozzle 5 is 30 m / s, and the swirl speed of the swirl deacidifier 6 is 5 m / s.

[0071] Performance Testing

[0072] Deacidification effect: The deacidified nanopowder is prepared into a suspension with a mass concentration of 2%, stirred evenly, and allowed to stand for 1-3 hours, and then the pH value of the upper clear liquid is measured with a pH meter;

[0073] Judgment criteria: pH = 6.5-7 is excellent; pH = 5-6.5 is good; pH < 5 is poor.

[0074] The test results are shown in Table 1.

[0075] Table 1. Performance test results of Examples 1-5

[0076] Example Example 1 Example 2 Example 3 Example 4 Example 5 Deacidification effect excellent excellent excellent Difference good

[0077] The foregoing examples are merely illustrative and are used to explain some features of the method of the present invention. The appended claims are intended to claim the widest possible range that can be conceived, and the embodiments presented herein are only illustrations of selected implementations according to the combination of all possible embodiments. Therefore, it is the applicant's intention that the appended claims are not limited by the selection of examples that illustrate the features of the present invention. Some numerical ranges used in the claims also include sub-ranges within them, and changes in these ranges should also be interpreted as being covered by the appended claims where possible.

Claims

1. A continuous nano powder deacidification device, characterized in that: The deacidification device comprises, from left to right, a gas inlet (1), a blower (2), a heater (3), a venturi conveyor (4), a nozzle (5) and a cyclone deacidification device (6); the gas inlet (1), the blower (2), the heater (3), the venturi conveyor (4) and the nozzle (5) are all connected by pipelines; the nozzle (5) and the cyclone deacidification device (6) are in a butting connection; The cyclone deacidifier (6) is provided with a material outlet (10) at the top, a cyclone baffle (12) inside, and a base (11) at the bottom; The cyclone baffles (12) are equidistantly distributed on both sides of the cyclone deacidifier (6).

2. The continuous nano powder deacidification device according to claim 1, characterized in that: The density of the nano powder is not higher than 250kg / m 3 .

3. The continuous nano powder deacidification device according to claim 1, characterized in that: The connection mode of the pipeline is flange connection.

4. The continuous nano powder deacidification device according to claim 1, characterized in that: A heat-insulating layer (9) is provided outside the pipeline.

5. The continuous nano powder deacidification device according to claim 1, characterized in that: The Venturi conveyor (4) is provided with a material bin (7); the Venturi conveyor (4) and the material bin (7) are detachably connected.

6. The continuous nano powder deacidification device according to claim 5, characterized in that: A valve (8) is provided at the bottom of the material bin (7).

7. The continuous nano powder deacidification device according to claim 1, characterized in that: The cyclone deacidifier (6) is provided with a heat-insulating layer (9) outside.

8. The continuous nano powder deacidification device according to claim 1, characterized in that: The spacing between the swirl baffles (12) is 30-80 cm.

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