JPH0791058B2 - Manufacturing method of zinc white - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing zinc white used in various fields. Specifically, the raw material zinc is vaporized by heating and vapor zinc is supplied by supplying oxygen gas. The present invention relates to a method for producing zinc white by oxidation.

[Conventional technology]

Conventionally, from the viewpoint that distillation purification is always necessary to produce zinc white, the raw material zinc is melted in a melting furnace at 1000 ° C to 14 ° C.
It was heated to 00 ° C. to be melted, and oxygen gas was supplied to the steam zinc generated from the molten zinc to cause the steam zinc to undergo self-combustion oxidation to generate zinc white.

[Problems to be solved by the invention]

However, in the above conventional manufacturing method, a large amount of fuel or electric power is required to heat the raw material zinc to 1000 ° C. to 1400 ° C. in the melting furnace to generate the steam zinc, and thus the manufacturing cost is increased. There was a problem.

An object of the present invention is to make it possible to produce high-quality zinc white at a low cost by a rational method focusing on self-combustion of zinc.

[Means for solving problems]

A feature of the method for producing zinc white according to the present invention is to use powdered zinc as a raw material zinc, heat the powdered zinc in an atmosphere of 600 ° C to 850 ° C, and supply oxygen gas to the heated atmosphere. The purpose is to cause powdered zinc to self-combust and oxidize while vaporizing the powdered zinc by the self-combustion. Its action and effect are as follows.

[Work]

That is, if the powdered zinc is heated in a low temperature atmosphere of 600 ° C. to 850 ° C., it will self-combust if sufficient oxygen gas is supplied to the heated atmosphere.

Since the surface temperature of each particle of powdered zinc that self-burns in this way reaches 1700 ° C to 1800 ° C due to self-burning, steam zinc is generated from each particle, and the steam zinc self-burns powdered zinc. During the phenomenon, they both self-combust and oxidize, and zinc white is generated.

〔The invention's effect〕

That is, in the production method of the present invention, since it is only necessary to form a low temperature heating atmosphere such as 600 ° C to 850 ° C, the raw material zinc is heated to a high temperature of 1000 ° C to 1400 ° C in the melting furnace as in the conventional case, and steam is generated. Compared with melting in the state where zinc is generated, the fuel or electric power required for heating can be greatly reduced.

Further, in the production method of the present invention, there is a process of vaporizing zinc, and since distillation purification is performed in the process of vaporizing, the quality of purified zinc white is high, and as a whole, high quality zinc is obtained. It has become possible to produce flower at low cost.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a manufacturing process of zinc powder granules used as a raw material for producing zinc dust and zinc white, and a process of manufacturing zinc powder from the raw powder granules. In the manufacturing process of raw powder granules, melting is performed. The molten zinc (L) in the furnace (1) is sucked together with the ambient air by the suction head (2), and the molten zinc suction (L) is cooled and solidified into powder particles in the suction transportation process in the suction head (2). Let

As shown in FIGS. 2 and 3, the molten metal (L) sucked together with the ambient air (A) from the suction port (3) at the suction head (2) is at a position immediately after passing through the suction port (3). It becomes the most constricted flow, is shredded from the most constricted part by suction action, and is then cooled into powder particles by the cooling action of the water cooling jacket (4) in the process of passing through the arrangement part of the water cooling jacket (4). Solidify.

Near the suction port (3), a plurality of air nozzles (5) for blowing cooling air to the molten molten metal (L) are annularly formed, and
The air nozzles (5) provided in the upper and lower stages promote the subdivision of the suction molten metal (L) by blowing cooling air to the suction molten metal (L) in the fragmentation subdivision process,
It is designed to produce finer zinc powder granules.

As described above, the zinc powder granules produced in the raw material manufacturing process are continuously transported by suction to the cyclones (6) and (7).
It is then sent to and collected by an air conditioner and separately sent to the zinc dust manufacturing process or zinc white manufacturing process by pneumatic transportation.

In the figure, (8) is a vacuum pump for suction transportation, and
(9) is a fan for pneumatic transportation.

Next, in the zinc white manufacturing process, the raw powder particles sent from the raw material manufacturing process are captured by the bag filter (10) and stored in the raw material tank (11).

From the raw material tank (11), the raw material powder and granules are quantitatively supplied to the rotary kiln (13) by the screw conveyor (12), and the zinc powder granules are fired in the rotary kiln (13).

In the rotary kiln (13), the furnace temperature was kept at 600 ° C to 850 ° C by adjusting the fuel amount in the burner (14),
Oxygen gas from the oxygen gas generator (15) is supplied into the furnace.

The zinc powder granules in the furnace self-combust by heating in an atmosphere of 600 ° C to 850 ° C and by supplying oxygen gas, and the surface temperature of each particle reaches 1700 ° C to 1800 ° C by the self-combustion, Steam zinc is generated from the particles.

Then, this steam zinc self-combusts and oxidizes together in the self-combustion of the zinc powder granules, thereby producing zinc white.

The zinc white thus produced is taken out of the rotary kiln (13) by the suction action of the ejector (16), collected by the bag filter (17) and stored in the cutout tank (18), and then according to the shipping request. , A predetermined amount is taken out from this cutting tank (18) and screw conveyor (1
It is sent to the automatic packing device (20) by 9).

In the figure, (21) is a fan for pneumatic transportation by the ejector (16), and (22) is a vibrating conveyor for sending the extraordinary products discharged from the rotary kiln (13) to the collection container (23).

[Another embodiment]

 Next, another embodiment will be listed.

(A) The powdered zinc as a raw material may be manufactured by any manufacturing method.

(B) Various types of devices can be applied to the apparatus for heating the powdered zinc in the atmosphere of 600 ° C to 850 ° C.

(C) The average particle size of the zinc powder used as the raw material may be appropriately selected.

(D) The use of the produced zinc white is not critical.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a process drawing, FIG. 2 is a vertical sectional view of a suction head, and FIG. 3 is an enlarged sectional view taken along the line III-III in FIG. is there.

Claims (2)

[Claims] 1. A raw material zinc is vaporized by heating,
A method of producing zinc white by oxidizing steam zinc by supplying oxygen gas, wherein powdered zinc is used as raw material zinc, and the powdered zinc is heated in an atmosphere of 600 ° C to 850 ° C and in the heating atmosphere. A method for producing zinc white, in which oxygen gas is supplied to the powder to cause the powdered zinc to self-combust, and the powdered zinc is vaporized by the self-combustion to be oxidized. 2. The method for producing zinc white according to claim 1, wherein oxygen gas is supplied while scattering the powdery zinc particles in the heating atmosphere.