阅读说明：本技术 一种5n氧化锌的生产装置和生产方法 (Production device and production method of 5N zinc oxide ) 是由 詹科 程平 于 2021-07-30 设计创作，主要内容包括：本发明提供一种5N氧化锌的生产装置和生产方法,其中,生产装置包括：加热釜,用于盛装5N锌原料,加热釜的上部设置有通气管,用于向加热釜中通入空气和氧气的混合气；冷却收集器,用于收集产品5N氧化锌；冷却管道,冷却管道的一端与加热釜的顶部开口连接,另一端与冷却收集器的顶部开口连接；第一筛板,第一筛板设置于冷却管道与冷却收集器的连接处；抽风机；输送管道,输送管道的一端与冷却收集器的侧部开口连接,另一端与抽风机的进口连接；第二筛板,第二筛板设置于输送管道与冷却收集器的连接处；排风管,排风管连接于抽风机的出口。本发明生产方法实现了持续生产5N氧化锌,节约了成本,提高了生产效率,降低了材料能耗。(The invention provides a production device and a production method of 5N zinc oxide, wherein the production device comprises: the heating kettle is used for containing 5N zinc raw materials, and a vent pipe is arranged at the upper part of the heating kettle and used for introducing mixed gas of air and oxygen into the heating kettle; the cooling collector is used for collecting the 5N zinc oxide product; one end of the cooling pipeline is connected with the top opening of the heating kettle, and the other end of the cooling pipeline is connected with the top opening of the cooling collector; the first sieve plate is arranged at the joint of the cooling pipeline and the cooling collector; an exhaust fan; one end of the conveying pipeline is connected with the opening at the side part of the cooling collector, and the other end of the conveying pipeline is connected with the inlet of the exhaust fan; the second sieve plate is arranged at the joint of the conveying pipeline and the cooling collector; and the exhaust pipe is connected with the outlet of the exhaust fan. The production method realizes continuous production of the 5N zinc oxide, saves the cost, improves the production efficiency and reduces the energy consumption of materials.)

1. A production apparatus for 5N zinc oxide, characterized in that the production apparatus comprises:

the heating kettle is used for containing 5N zinc raw materials, and a vent pipe is arranged at the upper part of the heating kettle and used for introducing mixed gas of air and oxygen into the heating kettle;

the cooling collector is used for collecting the 5N zinc oxide product;

one end of the cooling pipeline is connected with the top opening of the heating kettle, and the other end of the cooling pipeline is connected with the top opening of the cooling collector;

the first sieve plate is arranged at the joint of the cooling pipeline and the cooling collector;

an exhaust fan;

one end of the conveying pipeline is connected with the side opening of the cooling collector, and the other end of the conveying pipeline is connected with the inlet of the exhaust fan;

the second sieve plate is arranged at the joint of the conveying pipeline and the cooling collector;

and the exhaust pipe is connected with an outlet of the exhaust fan and is used for recovering 5N zinc oxide which is not collected by the cooling collector.

2. The apparatus for producing 5N zinc oxide according to claim 1, wherein the cooling pipe is an inverted U-shaped pipe.

3. The production apparatus of 5N zinc oxide according to claim 1, wherein the first sieve plate is defined to have a mesh opening size of D1, the second sieve plate has a mesh opening size of D2, D1 is (10-20) D2;

preferably, the aperture of the sieve mesh of the first sieve plate is 5-40 nm, and the aperture of the sieve mesh of the second sieve plate is 0.5-2 nm.

4. The apparatus for producing 5N zinc oxide according to claim 1, wherein the cooling collector comprises a cooling drum and a collecting tank; the cooling cylinder is inserted at the upper part of the collecting tank; the top of the cooling cylinder is provided with an opening to form a top opening of the cooling collector; and the side part of the cooling cylinder is provided with an opening to form a side opening of the cooling collector.

5. The production device of 5N zinc oxide according to claim 4, wherein the opening arranged at the top of the cooling cylinder extends outwards to form a connecting pipe, the connecting pipe is connected with the other end of the cooling pipeline, and the pipe diameter of the connecting pipe is the same as that of the cooling pipeline;

the first sieve plate is a circular sieve plate, and the diameter of the first sieve plate is matched with the inner diameter of the cooling pipeline.

6. The production device of 5N zinc oxide according to claim 1, wherein the heating kettle is a sealed heating kettle, and a sealing ring is arranged at the joint of the heating kettle and the cooling pipeline.

7. The production apparatus of 5N zinc oxide according to any one of claims 1 to 6, further comprising a bag collector, wherein an inlet of the bag collector is connected to an exhaust outlet of the exhaust duct.

8. A production method of 5N zinc oxide, characterized in that the production device of 5N zinc oxide according to any one of claims 1 to 7 is adopted, and the production method of 5N zinc oxide comprises the following steps:

adding 5N zinc ingots into a heating kettle, sealing the heating kettle, and assembling a cooling pipeline, a first sieve plate, a cooling collector, a second sieve plate, a conveying pipeline, an exhaust fan and an exhaust pipe;

step two, starting a heating mode of the heating kettle, melting 5N zinc ingots in the heating kettle into zinc liquid, and introducing mixed gas of oxygen and air into the heating kettle through a vent pipe to enable the zinc liquid in the heating kettle to generate oxidation reaction to generate zinc oxide;

and step three, exhausting air through an exhaust fan, pumping zinc oxide generated in the heating kettle to a first sieve plate through a cooling pipeline, allowing most of the zinc oxide to fall into a cooling collector through the first sieve plate, allowing a small amount of zinc oxide to enter a conveying pipeline through a second sieve plate, and pumping the zinc oxide into an exhaust pipe through the exhaust fan.

9. The method for producing 5N zinc oxide according to claim 8, wherein the mass percentage of oxygen in the mixed gas is 1-10%.

10. The method for producing 5N zinc oxide according to claim 9, wherein the heating temperature of the heating kettle in the second step is 400-500 ℃;

preferably, the heating temperature of the heating kettle in the second step is 450-490 ℃.

Technical Field

The invention belongs to the technical field of zinc oxide, and particularly relates to a production device and a production method of 5N zinc oxide.

Background

At present, pure oxygen and nitric acid are generally required to be introduced into 5N zinc oxide in the production process, a large amount of nitrogen oxides are generated under the high-temperature condition during production, the generated nitrogen oxides are further treated, the investment of equipment and cost is increased, certain influence is caused on the environment, continuous production cannot be realized, and the operation complexity is increased.

Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.

Disclosure of Invention

The invention aims to provide a production device and a production method of 5N zinc oxide, which aim to solve the problems of high cost, environmental pollution and incapability of continuous production caused by a large amount of nitrogen oxides generated at high temperature in the conventional 5N zinc oxide production.

In order to achieve the above purpose, the invention provides the following technical scheme:

a production apparatus for 5N zinc oxide, comprising: the heating kettle is used for containing 5N zinc raw materials, and a vent pipe is arranged at the upper part of the heating kettle and used for introducing mixed gas of air and oxygen into the heating kettle; the cooling collector is used for collecting the 5N zinc oxide product; one end of the cooling pipeline is connected with the top opening of the heating kettle, and the other end of the cooling pipeline is connected with the top opening of the cooling collector; the first sieve plate is arranged at the joint of the cooling pipeline and the cooling collector; an exhaust fan; one end of the conveying pipeline is connected with the side opening of the cooling collector, and the other end of the conveying pipeline is connected with the inlet of the exhaust fan; the second sieve plate is arranged at the joint of the conveying pipeline and the cooling collector; and the exhaust pipe is connected with an outlet of the exhaust fan and is used for recovering 5N zinc oxide which is not collected by the cooling collector.

The production device of 5N zinc oxide as described above, as an alternative embodiment, the cooling pipeline is an inverted U-shaped pipeline.

As an alternative example, the mesh diameter of the first sieve plate is defined as D1, the mesh diameter of the second sieve plate is defined as D2, and D1 is (10-20) D2.

In a preferred embodiment, the mesh aperture of the first sieve plate is 5-40 nm, and the mesh aperture of the second sieve plate is 0.5-2 nm.

The production device of 5N zinc oxide as described above, as an alternative embodiment, the cooling collector comprises a cooling cylinder and a collecting tank; the cooling cylinder is inserted at the upper part of the collecting tank; the top of the cooling cylinder is provided with an opening to form a top opening of the cooling collector; and the side part of the cooling cylinder is provided with an opening to form a side opening of the cooling collector.

As an optional embodiment, the opening formed in the top of the cooling cylinder extends outward to form a connecting pipe, the connecting pipe is connected with the other end of the cooling pipeline, and the pipe diameter of the connecting pipe is the same as that of the cooling pipeline; the first sieve plate is a circular sieve plate, and the diameter of the first sieve plate is matched with the inner diameter of the cooling pipeline.

As an optional embodiment, the heating kettle is a sealed heating kettle, and a sealing ring is arranged at the joint of the heating kettle and the cooling pipeline.

As an optional embodiment, the production apparatus for 5N zinc oxide further includes a bag collector, and an inlet of the bag collector is connected to an air outlet of the air exhaust pipe.

The invention also provides a production method of 5N zinc oxide, which adopts the production device of 5N zinc oxide, and the production method of 5N zinc oxide comprises the following steps:

adding 5N zinc ingots into a heating kettle, sealing the heating kettle, and assembling a cooling pipeline, a first sieve plate, a cooling collector, a second sieve plate, a conveying pipeline, an exhaust fan and an exhaust pipe;

step two, starting a heating mode of the heating kettle, melting 5N zinc ingots in the heating kettle into zinc liquid, and introducing mixed gas of oxygen and air into the heating kettle through a vent pipe to enable the zinc liquid in the heating kettle to generate oxidation reaction to generate zinc oxide;

and step three, exhausting air through an exhaust fan, pumping zinc oxide generated in the heating kettle to a first sieve plate through a cooling pipeline, allowing most of the zinc oxide to fall into a cooling collector through the first sieve plate, allowing a small amount of zinc oxide to enter a conveying pipeline through a second sieve plate, and pumping the zinc oxide into an exhaust pipe through the exhaust fan.

As an optional embodiment, in the production method of 5N zinc oxide, the mass percentage of oxygen in the mixed gas is 1-10%.

As an optional embodiment, the heating temperature of the heating kettle in the second step is 400-500 ℃.

In the second step, the heating temperature of the heating kettle is 450-490 ℃.

Has the advantages that:

the production device and the production method of the 5N zinc oxide can continuously add 5N zinc ingot raw materials, realize continuous production of the 5N zinc oxide, save the cost, improve the production efficiency and reduce the energy consumption of materials. Meanwhile, the production method of the invention also avoids the generation of nitrogen oxides, reduces the environmental pollution, and is a 5N zinc oxide production method which improves the economic benefit and the social benefit and saves resources.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Wherein:

FIG. 1 is a schematic structural view of a 5N zinc oxide production apparatus according to an embodiment of the present invention.

The reference numbers in the figures illustrate: 1. heating the kettle; 2. zinc liquid; 3. a breather pipe; 4. a cooling duct; 5. a first screen deck; 6. a second screen deck; 7. a delivery conduit; 8. an exhaust fan; 9. an exhaust duct; 10. the collector is cooled.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.

The present invention will be described in detail with reference to examples. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

As shown in fig. 1, fig. 1 is a production apparatus of 5N zinc oxide of the present invention, which is a top-suction type zinc oxide production method, and the production apparatus of 5N zinc oxide includes:

the heating kettle 1 is used for containing 5N zinc raw materials, the upper part of the heating kettle 1 is provided with a vent pipe 3 which is used for introducing mixed gas of air and oxygen into the heating kettle 1, and the mixed gas is used for oxidizing the 5N zinc raw materials into 5N zinc oxide; a cooling collector 10 for collecting the product 5N zinc oxide; one end of the cooling pipeline 4 is connected with the top opening of the heating kettle 1, and the other end of the cooling pipeline 4 is connected with the top opening of the cooling collector 10; alternatively, the cooling pipe 4 is a pipe into which a coolant is introduced, and the cooling collector 10 is a collector into which a coolant is introduced, and the coolant may be cooling water. The first sieve plate 5 is arranged at the joint of the cooling pipeline 4 and the cooling collector 10; an exhaust fan 8; one end of the conveying pipeline 7 is connected with the opening at the side part of the cooling collector 6, and the other end of the conveying pipeline 7 is connected with the inlet of the exhaust fan 8; the second sieve plate 6 is arranged at the joint of the conveying pipeline 7 and the cooling collector 10; an exhaust pipe 9, wherein the exhaust pipe 9 is connected with the outlet of the exhaust fan 8 and is used for recovering the 5N zinc oxide product which is not collected by the cooling collector 10.

Through 8 air bleeds of air exhauster for 5N zinc oxide that generates in the heating kettle 1 passes through cooling tube 4 and reachs first sieve 5, and most 5N zinc oxide falls into the cooling collector through first sieve 5, and a small amount of 5N zinc oxide is collected the back of retrieving because of the zinc oxide collection in getting into exhaust pipe 9 in passing through second sieve 6 entering exhaust pipe 9 of draft, can degrade the sale, reduces the dust and discharges, avoids environmental pollution.

In the preferred embodiment of the invention, the cooling pipeline 4 is an inverted U-shaped pipeline, so that in the process of conveying 5N zinc oxide, the inverted U-shaped cooling pipeline 4 can achieve a high screening effect, so that qualified products are conveyed under negative pressure, and the quality of the 5N zinc oxide products is greatly improved.

In an alternative embodiment of the present invention, the mesh diameter of the first screen deck 5 is defined as D1, the mesh diameter of the second screen deck 6 is defined as D2, and D1 is (10-20) D2, such as D1-10D 2, D1-12D 2, D1-14D 2, D1-16D 2, D1-18D 2, or D1-20D 2. The mesh aperture of the second sieve plate 6 is far smaller than that of the first sieve plate 5, so that the aspiration of the 5N zinc oxide can be effectively reduced, and most of the 5N zinc oxide is ensured to fall into the cooling collector 10.

In an optional embodiment, the first sieve plate has a mesh aperture of 5-40 nm (e.g., 5nm, 10nm, 15nm, 20nm, 25nm, 30nm, 35nm, or 40nm), and the second sieve plate has a mesh aperture of 0.5-2 nm (e.g., 0.5nm, 1.0nm, 1.5nm, or 2 nm).

Referring again to fig. 1, in an embodiment of the present invention, the cooling collector 10 includes a cooling cylinder (not shown) and a collecting tank (not shown), the cooling cylinder being inserted into an upper portion of the collecting tank; the top opening of the cooling cylinder forms the top opening of the cooling collector 10, and the side of the cooling cylinder is provided with an opening forming the side opening of the cooling collector 10. During assembly, one end of the cooling pipe 4 is connected to the top opening of the cooling cylinder, and one end of the delivery pipe 7 is connected to the side opening of the cooling cylinder.

The cooling cylinder is a cylindrical structure with a coolant, 5N zinc oxide generated in the heating kettle 1 is sucked out from the cooling pipeline 4 at the top, 5N zinc oxide powder is formed through the first sieve plate 5, and the 5N zinc oxide powder is sucked into the cooling cylinder, further cooled and finally falls into the collecting tank.

In the embodiment of the invention, an opening arranged at the top of the cooling cylinder extends outwards to form a connecting pipe (not marked), the connecting pipe is connected with the other end of the cooling pipeline 4, and the pipe diameter of the connecting pipe is the same as that of the cooling pipeline 4; the first sieve plate 5 is a circular sieve plate, and the diameter of the first sieve plate 5 is matched with the inner diameter of the cooling pipeline 4. During assembly, the cooling pipeline 4 and the connecting pipe at the top of the cooling cylinder can be connected together through the connecting sleeve, the first sieve plate 5 is inserted and fixed on the inner wall of the port at one end, connected with the connecting pipe, of the cooling pipeline 4, and the assembly operation is simple, feasible and effective.

In the specific embodiment of the invention, the second sieve plate 6 is a circular sieve plate, the diameter of the second sieve plate 6 is matched with the inner diameter of the conveying pipeline 7, and the second sieve plate 6 is inserted and fixed on the inner wall of the port at the end, connected with the cooling cylinder, of the conveying pipeline 7 during assembly. And the outer diameter of the conveying pipeline 7 is matched with the size of the side opening of the cooling cylinder, and the opening end of the conveying pipeline 7 is inserted and fixed in the side opening of the cooling cylinder during assembly, so that the operation is simple, easy and effective.

In the embodiment of the present invention, the heating kettle 1 is a sealed heating kettle, and a sealing ring (not shown) is disposed at the joint of the heating kettle 1 and the cooling pipeline 4. So set up, can guarantee that whole apparatus for producing has better leakproofness, prevent effectively that outside air impurity from getting into and polluting the product, improve the purity of product, also guarantee simultaneously that the product can be more fully sucked to cooling tube 4 in, and then fall into cooling collector 10 through first sieve 5 in, improve the productivity of product.

Furthermore, the production device of 5N zinc oxide of the invention also comprises a cloth bag collector (not shown), and the inlet of the cloth bag collector is connected with the air outlet of the air exhaust pipe 9. The bag collector is used for recovering a small amount of 5N zinc oxide powder discharged by the exhaust pipe 9.

The invention also provides a production method of the 5N zinc oxide, which adopts the production device of the 5N zinc oxide, and the production method of the 5N zinc oxide comprises the following steps:

step one, adding 5N zinc ingots into a heating kettle 1, sealing the heating kettle 1, and assembling a cooling pipeline 4, a first sieve plate 5, a cooling collector 10, a second sieve plate 6, a conveying pipeline 7, an exhaust fan 8 and an exhaust pipe 9;

step two, starting a heating mode of the heating kettle 1, melting 5N zinc ingots in the heating kettle 1 into zinc liquid 2, and introducing mixed gas of oxygen and air into the heating kettle 1 through a vent pipe 3 to enable the zinc liquid 1 in the heating kettle 1 to generate oxidation reaction to generate zinc oxide;

step three, pumping air through an exhaust fan 8, pumping the zinc oxide generated in the heating kettle 1 to a first sieve plate 5 through a cooling pipeline 4, enabling most of the zinc oxide to fall into a cooling collector 10 through the first sieve plate 5, enabling a small amount of zinc oxide to enter a conveying pipeline 7 through a second sieve plate 6, and then pumping the zinc oxide into an exhaust pipe 9 through the exhaust fan 8 for recycling.

The invention relates to a production mode of top-suction zinc oxide, which is characterized in that 5N zinc ingots in a heating kettle 1 are heated and melted into a zinc liquid 2, and a mixed gas of oxygen and air is introduced into a vent pipe 3, so that the surface of the zinc liquid 2 is violently oxidized and combusted to generate zinc oxide. The zinc oxide is sucked out from the cooling pipeline 4 at the top by the exhaust fan 8, zinc oxide powder is formed by the first sieve plate 5, and the zinc oxide powder is sucked into the cooling collector 10 for further cooling; and a small amount of qualified products with smaller particle size and lighter weight are sucked by negative pressure, enter the conveying pipeline 7 through the second sieve plate 6, are sucked into the exhaust pipe 9 through the exhaust fan 8, and are finally discharged and recovered through the exhaust outlet of the exhaust pipe 9.

When the production device of 5N zinc oxide is used for producing 5N zinc oxide, no residue exists in the cooling pipeline 4, so that cleaning work is not needed, the operation intensity can be reduced, and manpower can be saved. And the heating temperature of the heating kettle is easier to control and maintain, thereby reducing energy consumption. Meanwhile, in the production process, the zinc raw material can be continuously added, so that the continuous production of the 5N zinc oxide is realized, the cost is saved, the generation efficiency is improved, the material consumption is reduced, the generation of nitrogen oxides is avoided, and the environmental pollution is reduced.

In an alternative embodiment of the present invention, the oxygen content of the mixed gas is 1-10% (e.g. 1%, 3%, 5%, 7% or 10%) by mass. Because pure oxygen is higher in cost, the mixed gas is composed of most of air and a small amount of oxygen, the zinc raw material can be effectively and fully oxidized into zinc oxide by the mixed gas composed of the pure oxygen and the oxygen, and meanwhile, the production cost is reduced to a certain extent.

In the embodiment of the invention, in the second step, the introduction amount of the mixed gas is 1500m for 500-1500m for each ton of 5N zinc ingots³(e.g., 500 m)³、600m³、700m³、800m³、900m³、1000m³、1100m³、1200m³、1300m³、1400m³Or 1500m³) And the flow rate of the mixed gas is kept at 100-200m³Min (e.g. 100 m)³/min、120m³/min、140m³/min、160m³/min、180m³Min or 200m³Min), so as to ensure that the oxygen in the mixed gas and the zinc liquid 2 react more fully, thereby improving the yield of the product.

In the embodiment of the present invention, the heating temperature of the heating kettle 1 in the second step is 400 to 500 ℃, and preferably, the heating temperature of the heating kettle 1 in the second step is 450 to 490 ℃ (for example, 450 ℃, 460 ℃, 470 ℃, 480 ℃ or 490 ℃). The heating temperature in the range can ensure that the zinc liquid 2 in the heating kettle 1 can be fully and violently oxidized and combusted, and the yield of the product is improved.

The production process of 5N zinc oxide according to the present invention will be described in detail below by way of specific examples.

Example 1

The production method of zinc oxide 5N of the embodiment comprises the following steps:

step one, adding 1 ton of 5N zinc ingots into a heating kettle 1, sealing the heating kettle 1, and assembling a cooling pipeline 4, a first sieve plate 5, a cooling collector 10, a second sieve plate 6, a conveying pipeline 7, an exhaust fan 8 and an exhaust pipe 9, wherein the aperture of a sieve hole of the first sieve plate 5 is 40nm, and the aperture of a sieve hole of the second sieve plate 6 is 2 nm;

step two, starting a heating mode of the heating kettle 1, controlling the heating temperature to be 450 ℃, melting 5N zinc ingots in the heating kettle 1 into zinc liquid 2, and introducing 600m into the heating kettle 1 through a vent pipe 3³Mixing gas, keeping the flow of the mixed gas at 120m³Min, enabling the zinc liquid 1 in the heating kettle 1 to have oxidation reaction to generate 5N zinc oxide, wherein the mass percent of oxygen in the mixed gas is 3%;

and step three, exhausting air through an exhaust fan 8, exhausting zinc oxide generated in the heating kettle 1 to a first sieve plate 5 through a cooling pipeline 4, enabling most of 5N zinc oxide to fall into a cooling collector 10 through the first sieve plate 5, enabling a small amount of 5N zinc oxide to enter a conveying pipeline 7 through a second sieve plate 6, then exhausting the zinc oxide to an exhaust pipe 9 through the exhaust fan 8, and finally recovering the zinc oxide from a cloth bag collector through an exhaust outlet of the exhaust pipe 9.

The 5N zinc oxide collected by the cooling collector 10 and the 5N zinc oxide powder recovered by the cloth bag collector are detected to be pure zinc oxide phases by an X-ray diffraction method, and the average particle size of the 5N zinc oxide powder collected by the cooling collector 10 is 25nm and the average particle size of the 5N zinc oxide powder recovered by the cloth bag collector is 1.6 nm. Meanwhile, the purity of the product is 99.9998 percent, namely the product purity reaches 5N level, and the yield is 99.96 percent through calculation and is higher.

Example 2

The production method of zinc oxide 5N of the embodiment comprises the following steps:

step one, adding 1 ton of 5N zinc ingots into a heating kettle 1, sealing the heating kettle 1, and assembling a cooling pipeline 4, a first sieve plate 5, a cooling collector 10, a second sieve plate 6, a conveying pipeline 7, an exhaust fan 8 and an exhaust pipe 9, wherein the aperture of a sieve hole of the first sieve plate 5 is 25nm, and the aperture of a sieve hole of the second sieve plate 6 is 1.5 nm;

step two, starting a heating mode of the heating kettle 1, controlling the heating temperature to 475 ℃, melting 5N zinc ingots in the heating kettle 1 into zinc liquid 2, and introducing 850m into the heating kettle 1 through a vent pipe 3³Mixing gas, keeping the flow rate of the mixed gas at 150m³Min, enabling the zinc liquid 1 in the heating kettle 1 to have oxidation reaction to generate 5N zinc oxide, wherein the mass percent of oxygen in the mixed gas is 6%;

and step three, exhausting air through an exhaust fan 8, exhausting zinc oxide generated in the heating kettle 1 to a first sieve plate 5 through a cooling pipeline 4, enabling most of 5N zinc oxide to fall into a cooling collector 10 through the first sieve plate 5, enabling a small amount of 5N zinc oxide to enter a conveying pipeline 7 through a second sieve plate 6, then exhausting the zinc oxide to an exhaust pipe 9 through the exhaust fan 8, and finally recovering the zinc oxide from a cloth bag collector through an exhaust outlet of the exhaust pipe 9.

The 5N zinc oxide collected by the cooling collector 10 and the 5N zinc oxide powder recovered by the cloth bag collector are detected to be pure zinc oxide phases by an X-ray diffraction method, and the average particle size of the 5N zinc oxide powder collected by the cooling collector 10 is 20nm and the average particle size of the 5N zinc oxide powder recovered by the cloth bag collector is 1.0 nm. Meanwhile, the purity of the product is 99.9997 percent, namely the product purity reaches 5N level, and the yield is 99.95 percent and is higher through calculation.

Example 3

The production method of zinc oxide 5N of the embodiment comprises the following steps:

step one, adding 1 ton of 5N zinc ingots into a heating kettle 1, sealing the heating kettle 1, and assembling a cooling pipeline 4, a first sieve plate 5, a cooling collector 10, a second sieve plate 6, a conveying pipeline 7, an exhaust fan 8 and an exhaust pipe 9, wherein the aperture of a sieve hole of the first sieve plate 5 is 10nm, and the aperture of a sieve hole of the second sieve plate 6 is 1 nm;

step two, starting a heating mode of the heating kettle 1, controlling the heating temperature to be 490 ℃, melting 5N zinc ingots in the heating kettle 1 into zinc liquid 2, and introducing 1200m of zinc liquid into the heating kettle 1 through a vent pipe 3³Mixing gas, keeping the flow of the mixed gas at 200m³Min, enabling the zinc liquid 1 in the heating kettle 1 to have oxidation reaction to generate 5N zinc oxide, wherein the mass percent of oxygen in the mixed gas is 8%;

and step three, exhausting air through an exhaust fan 8, exhausting zinc oxide generated in the heating kettle 1 to a first sieve plate 5 through a cooling pipeline 4, enabling most of 5N zinc oxide to fall into a cooling collector 10 through the first sieve plate 5, enabling a small amount of 5N zinc oxide to enter a conveying pipeline 7 through a second sieve plate 6, then exhausting the zinc oxide to an exhaust pipe 9 through the exhaust fan 8, and finally recovering the zinc oxide from a cloth bag collector through an exhaust outlet of the exhaust pipe 9.

The 5N zinc oxide collected by the cooling collector 10 and the 5N zinc oxide powder recovered by the cloth bag collector are detected to be pure zinc oxide phases by an X-ray diffraction method, and the average particle size of the 5N zinc oxide powder collected by the cooling collector 10 is 8nm and the average particle size of the 5N zinc oxide powder recovered by the cloth bag collector is 0.75 nm. Meanwhile, the purity of the product is 99.9996 percent, namely the product purity reaches 5N level, and the yield is 99.94 percent through calculation and is higher.

In summary, the following steps: in the embodiment of the invention, 5N zinc ingots are used as raw materials, the raw materials are added into a heating kettle 1 and heated until the raw materials are melted into zinc liquid 2, the zinc liquid is fully oxidized and combusted through mixed gas of air and a small amount of oxygen, powdered zinc oxide produced by oxidation and combustion is pumped into a cooling pipeline 4 through air exhaust of an exhaust fan 8, and then the powdered zinc oxide is settled into a cooling collector 10 through a first sieve plate 5 and discharged from an automatic discharge port to obtain finished zinc oxide powder. And the 5N zinc oxide powder with higher purity and smaller grain diameter is obtained by reasonably controlling the heating temperature, the adding amount and the flow rate of the mixed gas, the oxygen content in the mixed gas and the size of the first sieve plate 5. The zinc oxide powder which is not collected by the cooling collector 10 enters the conveying pipeline 7 and the exhaust pipe 9 due to suction force, is finally discharged from the exhaust outlet of the exhaust pipe 9 and is recovered by the cloth bag collector, so that the pollution to the environment caused by dust emission is reduced. Therefore, the production method of the 5N zinc oxide powder is a zinc oxide production method which can improve economic benefits and social benefits and save resources, and has good application prospects.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.