KR100985676B1 - zinc oxide powder manufacturing apparatus and method - Google Patents

Abstract

The present invention relates to an apparatus and a method for producing fine powdered zinc oxide by oxidizing vaporized zinc vapor, and to dissolving zinc ingot in a melting furnace heated by electrothermal treatment to form a molten metal, and tilting the melting furnace to form a melt and a induction pipe. After the molten metal is injected into the vaporization furnace, the molten zinc is heated by heating the molten zinc in the state of being blocked from the external air in the vaporization furnace, and the zinc vapor is introduced into the oxidation furnace through the outlet to cause oxidation reaction by external air. A device and method for producing fine powder zinc oxide having a uniform particle size and excellent purity and color by separating zinc oxide into a zinc oxide having a large particle size and a zinc oxide fine powder and air with a cyclone dust collector. .

Zinc Oxide, Melting Furnace, Vaporization Furnace, Oxidation, Cyclone Dust Collector

Description

Zinc oxide powder manufacturing apparatus and method

The present invention relates to an apparatus and method for producing zinc oxide, such as zinc oxide or zinc bag, which is a zinc (Zn) oxide used in rubber vulcanization accelerators, paints, pigments, inks and ceramic glazes, catalysts and the like.

Zinc is a blue-white metal with a melting point of 419.5 ° C, a boiling point of 907 ° C, and zinc itself is extremely corrosive, but when placed in air, a film of carbonate is formed on the surface to prevent internal corrosion.

As a conventional method and apparatus for producing zinc oxide, a zinc ingot is melted in an electric furnace 1 and a molten zinc is rotated as shown in FIG. 1 of KR Publication No. 2003-67630 (published on Aug. 14, 2003). After input to this possible reactor (6), the reaction furnace is rotated so that the slurry of zinc oxide generated on the surface of molten zinc does not interfere with the contact between the molten zinc and the air while stirring the gas or liquid fuel in the reactor. When the temperature in the reactor reaches 1500 ℃ ± 150 ℃, which is enough to vaporize the molten zinc, the fuel injection is stopped and external air is supplied to form an oxidizing atmosphere to vaporize zinc by the heat of self-oxidation reaction. Apparatuses and methods have been known which allow for the production of zinc oxides by causing a significant oxidation reaction.

In the manufacturing apparatus and method described above, by using fossil fuel in the process of heating the molten zinc to a temperature sufficient to vaporize, the impurities such as carbon may remain, so that the quality of zinc oxide may be degraded in purity or color. To control the rotational speed of the reactor to agitate the slurry generated on the surface of the zinc, and to discharge the slurry accumulated on the surface of the molten zinc to the outside of the reactor, skilled personnel were required and the slurry discharge operation was necessary from time to time. The difficulty of maintaining the persistence of the device was difficult to automate.

In order to solve the above problems, in the present invention, dissolution and vaporization of zinc oxide on the surface of the molten zinc are prevented from occurring by fundamentally excluding impurity infiltration by using heat transfer as a heating means for dissolving or vaporizing zinc. It provides a device and method that can block contact with air in the process to maintain continuity of work and automate the device to eliminate skilled personnel.

In addition, the present invention is to eliminate the use of fossil fuel to eliminate the pollution prevention facility for the exhaust gas and to provide a comfortable working environment without the generation of noise and dust.

The zinc oxide fine powder production apparatus and method of the present invention can produce high quality zinc oxide with excellent purity and color of zinc oxide produced and uniform particle size, and do not generate slurry to maximize the yield for the raw material introduced. It is possible to easily manufacture the insulation structure of the furnace for heating and vaporization, which can greatly improve thermal efficiency by minimizing the loss of energy. It has the effect of enabling operation.

In the present invention, the apparatus for producing zinc oxide fine powder is melted by first heating the zinc ingot in a furnace heated by electricity capable of tilting, and melting the zinc zinc under the surface of the molten metal in the vaporization furnace through the water bath and the melt induction pipe. In the vaporization furnace where the inflow of air is blocked, secondary heating of the molten zinc to the vaporization temperature, and zinc oxide heated in the vaporization furnace by oxidation in contact with external air in the oxidation furnace. And zinc oxide particles are collected while cooling the produced zinc oxide with a cyclone dust collector.

The method for producing a zinc oxide fine powder of the present invention by the above apparatus comprises the steps of: melting a zinc ingot by heating it in a primary furnace in a furnace heated by electricity capable of tilting;

Injecting molten zinc into the melt surface of the vaporization furnace through the melt and melt induction tubes;

Secondary heating the molten zinc in the vaporization furnace where the inflow of air is blocked to the vaporization temperature by electric heat;

Zinc zinc heated in the vaporization furnace in contact with external air in the oxidation furnace to oxidize to produce zinc oxide;

Collecting zinc oxide particles while cooling the resulting zinc oxide with a cyclone dust collector.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The following examples are intended to illustrate the present invention, and thus, do not limit the scope of the present invention, and the well-known constitution within the scope of not obscuring the constitution of the present invention will be omitted. The configuration will be made clearer.

2 is a schematic manufacturing process diagram of the present invention, Figure 3 is a perspective view of a manufacturing apparatus capable of implementing the manufacturing method of the present invention, Figure 4 is a plan view of a manufacturing apparatus capable of implementing the manufacturing method of the present invention, 5 is a cross-sectional view of a manufacturing apparatus capable of implementing the manufacturing method of the present invention.

As shown in the drawing, the melting furnace 13 is configured as a crucible type heated by a heat generating element 11 that generates electricity by electricity, and the outside of the heat generating element 11 is wrapped with a heat insulator 12 and the melting furnace 13 as a whole. The tilting is supported by the bracket 14.

Zinc ingot or scrap is introduced into the melting furnace 13, and the melting point of zinc is 419.5 ° C., but the temperature of the molten zinc is 700 ° C. ± 50 ° C. in consideration of the fluidity of the molten metal. Tilt (13) is injected into the gasification furnace (17) through the runway 15 and the melt induction pipe (16).

The molten zinc is introduced into the vaporization furnace 17 so as to prevent a sudden change in the molten surface temperature of the molten zinc in the vaporization furnace 17. The molten zinc flows down the molten surface of the vaporization furnace 17 through the melt induction pipe 16. It is desirable to allow injection.

The specific gravity of zinc oxide is 5.47 ~ 5.61, which is lighter than zinc's specific gravity 7.142, and the sublimation point of 1720 ℃ is significantly higher than zinc's vaporization point of 907 ℃. In order to cover the surface of the molten zinc in the state to prevent the vaporization of zinc, in order to promote the vaporization of zinc, the vaporization furnace 17 should be formed in a closed structure to block the inflow of external air.

The vaporization furnace 17 is heated by a heat generating element 11 that generates electricity by electricity, and the outside is formed in a form wrapped with a heat insulator 12 and formed to be inclined at an angle to widen the surface area of the molten zinc so that the molten zinc is vaporized smoothly. When the molten zinc is heated to 1300 ° C. ± 100 ° C., which is a temperature sufficient to vaporize the heating of the vaporization furnace 17, the vaporized heating vapor is oxidized through the outlet 18 of the vaporization furnace 17. ) Will flow naturally.

The zinc vapor introduced into the oxidation furnace 19 is in contact with external air in the oxidation furnace 19 to generate zinc oxide while oxidation occurs.

The outside air cools down the inner wall while passing between the outer wall and the inner wall of the oxidation furnace 19, and is dispersed and introduced through a plurality of air holes (not shown) perforated in the inner wall and oxidized in contact with the zinc vapor to oxidize high quality. It produces zinc vapor.

The zinc oxide vapor generated in the gasification furnace 17 is first cooled in the oxidation furnace 19 and then introduced into the cyclone dust collector 20, and the zinc oxide vapor introduced into the cyclone dust collector 20 is further cooled while being cyclone. Centrifugal force of the dust collector 20 separates the zinc oxide fine powder having a large particle diameter, the zinc oxide fine powder having a small particle diameter, and air.

The fine powder obtained by separating from the cyclone dust collector 20 can be separated according to the size of the particle size, so that the size of the particle size can be maintained uniformly, and can be selected according to the use. High quality fine powder zinc oxide can be obtained.

The present invention enables to produce zinc oxide fine powder having uniform particle size and excellent purity and color at low cost, and thus can be used as additives in various industries such as paints, pigments, inks, rubber vulcanization accelerators, and glazes of ceramics.

1 is a manufacturing process diagram (a) and apparatus diagram (b) of Publication No. 2003-67630

2 is a schematic manufacturing process diagram of the present invention

Figure 3 is a perspective view of a manufacturing apparatus that can implement the manufacturing method of the present invention

Figure 4 is a plan view of a manufacturing apparatus that can implement the manufacturing method of the present invention

5 is a cross-sectional view of a manufacturing apparatus capable of implementing the manufacturing method of the present invention.

[Description of Drawings]

11. Heating element

12. Insulation

13. Melting Furnace

14. Bracket

15. Tando

16. Melt Induction Tube

17. By vaporization

18. Outlet

19. Oxidation Furnace

20. Cyclone Dust Collector

Claims (2)

In the apparatus for producing fine powder zinc oxide by heating and oxidizing zinc, A melting furnace 13 for dissolving zinc ingot by heat transfer, a melt induction pipe 16 for injecting dissolved zinc below the zinc solution surface of the gasification furnace 17, and a heat-transfer state in a state where it is blocked from external air. Cooling the vaporization furnace for heating and evaporating the molten zinc, the oxidation furnace (19) which induces vaporized zinc vapor to generate zinc oxide by reaction with external air, and the zinc oxide produced in the oxidation furnace (19). And a cyclone dust collector 20 which separates the zinc oxide fine powder and the air into a zinc oxide fine powder production apparatus. In a method of producing fine powder zinc oxide by heating and oxidizing zinc, Dissolving the zinc ingot in the melting furnace 13 by heat transfer; Injecting the molten zinc into the zinc solution surface of the vaporization furnace 17 by the melt induction tube 16; Heating and evaporating the molten zinc by heat transfer in the vaporization furnace 17 blocked from external air; Introducing zinc vaporized vapor into the oxidation furnace (19) to produce zinc oxide by reaction with external air; The zinc oxide fine powder production method characterized in that the step of cooling and the zinc oxide fine powder and air separated in the cyclone dust collector (20) produced by the oxidation furnace (19).

Images