JP3011022B2 - Dross treatment equipment in hot-dip metal plating tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reaction tank having a porosity in which a top dross formed on a bath surface in a molten metal plating bath is provided in the molten metal plating bath and through which the molten metal can pass. The present invention relates to an apparatus for separating and melting only the molten metal remaining in a top dross by adding and stirring a flux in a hot metal plating bath.

[0002]

2. Description of the Related Art In hot-dip galvanizing equipment, in a hot-dip galvanizing method, air reacts with zinc in a gas restrictor for adjusting the amount of metal adhering to zinc to form a viscous top dross (ZnO).
Is formed on the upper surface of the plating bath. This top dross accumulates on the zinc bath and, in the worst case, adheres to the surface of the material to be plated such as a metal strip and becomes a defect, which impairs the quality of the hot metal plating. Usually, they are pumped into buckets and sold as dross masses. However, the dross pumping and removal work by the above-mentioned workers is a muscular work in a poor environment, and the top dross contains 90% or more of pure zinc, so that the zinc yield is greatly reduced. Because of the reduction, the establishment of an automatic dross collection method has been desired since the start of the line. In order to solve this, various methods have been considered, and a method of separating / collecting and reusing has been devised and put into practical use.

[0003] As one of the methods of separation / recovery and reuse, for example, dross and flux are reacted in a recovery apparatus to recover metallic zinc, and the produced ash and Cl ₂ gas are washed with an alkaline solution. Japanese Patent Application Laid-Open No. Sho 55-104446 discloses a method for improving the working environment by automating the dross collection operation. As shown in FIG. 4, first, a top dross b floating and deposited on a zinc molten metal plating bath a is fed into an inlet 29 of a recovery device 21 as shown in FIG. On the other hand, the charging lid 32 is opened, a flux c such as ZnCl ₂ is charged, and the lid 32 is closed. Then, dross b and flux c in the device 21
With the rotation of the screw 24, the inert gas introduced from the suction port 34 is sent into the inside of the apparatus main body 23, and the metal zinc d generated by the reaction between the two is collected by the separation plate 38. Also dross b
The ash e generated from the ZnO and the flux inside and floating on the zinc bath surface is collected together with the unreacted dross b at the front of the separation plate 38, and the light ash e is sent to the ash carrying cylinder 40 through the separation plate 38. At this time, the inert gas separated cylindrical body 40, a vertical flue cylindrical member 42, sent to cleaning tube 50 via a horizontal flue cylindrical body 43, and washed from the sprayer 52 is ejected alkali solution, Cl ₂ gas And to remove remaining fine powder ash.

[0004]

However, according to the above-mentioned prior art, dross b charged into the recovery device 21 is liable to adhere and deposit on the screw 24 and the stirring rod 25 or inside the device main body 23 when reacting with the flux. This often results in poor rotation of, which hinders the promotion of the reaction. In such a case, the inspection small lid 28 is opened, and in the worst case, the large lid 27 is opened, and the attached dross is removed by melting with a burner, or removing it with a jig such as a bur. Care was required frequently. When such care is taken, deformation of the main body 28 or the screw 2
4. The stirring rod 25 may be deformed or broken. In addition, as it is used for a long time, the stirring shaft is thermally deformed,
It was difficult to use this dross recovery device stably, for example, due to poor rotation. It is an object of the present invention to provide a device which does not require such maintenance of the device or prevents deterioration of the device during long-term use, improves durability, and enables stable dross recovery. .

[0005]

According to a first aspect of the present invention, there is provided a dross treatment apparatus in a molten metal plating tank, which includes a plating tank for storing a molten metal, a dross scraping device provided near the plating tank, and a plating apparatus. Immersed in bath
And a dross reactor you put the arms Dross scraped up device for supporting and immersible dross scraped up unit in the plating bath, dross scraped up section, a support base for supporting the arm portion, the arm portion a driving unit for driving the reaction vessel, Bei a ceramic filter for filtering dross have a hole of
It is characterized in that that example. The second invention is
A flux supply device provided near the molten metal plating tank, a dust collector that collects steam from the reaction tank, and an ash
And a yield boxes, flux supply unit for supplying a storing unit for storing the flux, the flux into the reaction vessel subjected
A supply unit and a receiver for receiving the flux supplied to the arm unit
And a dish .

[0006]

The dross treatment apparatus in a hot-dip metal plating bath according to the present invention removes dross floating on a bath surface in a hot-dip metal plating bath for storing a hot-dip metal in a hot-dip metal plating bath provided near the hot-dip metal plating bath. An arm for supporting a dross scraping unit which can be immersed in the arm, a support for supporting the arm, and a dross scraping unit of a dross scraping device provided with a driving unit for driving the arms are collected at a predetermined position. The dross collected at a predetermined position in the dross scraping unit is dipped in a hot-dip metal plating bath and has a porous property to filter the dross.
It is put into a reaction tank equipped with a lamic filter and processed. In addition, a storage portion provided near the hot-dip metal plating tank for storing the flux, and supplying the flux to the reaction tank.
Receiving a supply unit for supplying, a flux supplied to the arm portion
Kicking a pan, it supplied flux reacts with dross. At that time, the steam generated from the reaction tank is processed by the dust collector , and the ash generated on the upper surface of the reaction tank is
Ru is collected in the ash collection box.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a dross treatment apparatus in a molten metal plating tank according to the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing the entire apparatus, and FIG. 2 is a side view. Reference numeral 1 denotes a robot, which constitutes a dross scraping device portion, and 2 denotes a dipper, which constitutes a dross scraping portion of the dross scraping device. Reference numeral 3 denotes a reaction tank having porosity. Reference numeral 5 denotes a duct which constitutes a dust collecting unit. 6 is an ash collection box, 7 is a storage unit 7a for storing a flux by a flux supply device, and a discharge unit 7 for discharging the flux to the reaction tank.
b. The robot 1 includes a ladle 2 (a dross scraping portion), a ladle support arm A (an arm) for supporting the ladle 2, and a ladle support arm A
And a supporting portion B (supporting base) for supporting. The ladle 2 is processed into a wire mesh as shown in FIG. 3 and is operated by the robot 1. In order to form the support portion B, first, the base 60 is moved to the plating tank 23.
The first arm member 62 is connected to the base 60 via the rotation shaft 61 in a state where the first arm member 62 is erected, and the first link 63 is set in a substantially horizontal state via the rotation shaft 61. Connecting. A second link 6 having the same length as the first arm member 62 is attached to the other end of the first link 63.
4 are connected by a rotating shaft 68. Further, with the first arm member 62 and the second link 64 being parallel to each other, a second arm member 67 is attached to each free end of the first arm member 62 and the second link 64. Is rotatable about a rotating shaft 65,
Connect at 66. In this manner, the support portion B is provided with the first arm member 62, the first link 63, and the second link 6
4. The second arm member 67 constitutes a parallelogram link mechanism. Driving means (not shown) is provided on the support portion B and is set to be drivable. The ladle support arm A is rotatably connected to the distal end of the second arm member 67. Reaction tank 3 is plating tank 2
3, a ceramic filter 4 having porosity is provided at the bottom so that the molten metal flows. The duct 5 covers the reaction tank 3, connects to the dust collector 10, and communicates with the exhaust port 11. The ash collection box 6 and the flux supply device 7 are arranged within the operation range of the robot 1. In the apparatus having the above configuration, first, dross b on the zinc bath a in the plating tank 23 is scraped to a desired position near the reaction tank 3 installed on the zinc bath a. Next, the robot 1 is operated, and the dross b is pumped up by the ladle 2 at the tip and put into the reaction tank 3. Depending on the throughput of the dross b, the number of times the robot 1 puts the dross b into the reaction tank 3 is repeated several times. When the required amount of dross b is charged into the reaction tank 3, the robot 1 operates toward the flux supply device 7, and moves the flux tray 12 installed beside the robot arm to the flux extended from the flux supply device 7. It is made to stand by under the slot 13. When the proximity switch is turned ON, the flux c is cut out from the flux inlet 13 and is put into the flux tray 12. When the flux c of several percent of the amount of the processing dross is supplied to the tray 12, the robot 1 operates and throws the flux c into the reaction tank 3. Next, the flux c and the dross b charged into the reaction tank 3 are stirred by the ladle 2 at the end of the robot arm, and the metallic zinc generated by the reaction of the two is:
It is recovered by refluxing into the zinc bath a. H generated during the reaction
F gas (1 ppm or less) and dust are sucked through the duct 5, pass through the dust collector 10, are filtered by the bag filter, and are discharged from the exhaust port 11 to the outside. In addition, Fe-A
In order to prevent l-system dross from being generated and floating in the bath, a ceramics filter is installed at the bottom 4 of the reaction tank 3 for filtration. After the reaction, the ash generated on the upper surface of the reaction tank 3 is pumped again by the ladle 2 at the tip of the robot arm, carried to the ash collection box 6, and collected. As described above, a series of operations are automatically performed by the robot, so that the dross collection process is stably performed. During the operation of the robot, the inside of the operation range of the robot is surrounded by a safety fence 8 so that no one can enter.

[0008]

As described above, according to the present invention, the flux
Fe-Al dross generated during the reaction of
Prevents the plating quality from being impaired by floating in the bath, and about 70% of zinc as a pure metal can be automatically recovered and reused from the top dross , thereby improving the zinc yield in hot-dip galvanized metal plating. Labor saving in dross collection work can be achieved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a dross treatment apparatus in a hot-dip metal plating tank of the present invention.

FIG. 2 is a side view showing one embodiment of a dross treatment apparatus in a molten metal plating tank according to the present invention.

FIG. 3 is an explanatory diagram showing a dross scraping unit included in the dross scraping device of the present invention.

FIG. 4 is an explanatory diagram illustrating a dross recovery device according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Robot 2 Ladle 3 Reaction tank 4 Ceramics filter 5 Exhaust duct 6 Ash collection box 7 Flux supply device 8 Safety fence 9 Flue 10 Dust collector 11 Exhaust port 12 Flux tray 13 Flux inlet

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihide Uehara 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (56) References JP-A-5-302157 (JP, A) JP-A Sho54 -132987 (JP, A) Japanese Utility Model 63-10059 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) C23C 2/00-2/40

Claims (2)

(57) [Claims] Comprising 1. A plating bath for containing molten metal, and the dross scraped up device provided in the vicinity of the plating tank, and a reaction vessel you put dross scraped up while being immersed in the plating bath, dross scraped up device and immersible dross scraped up unit in the plating bath, an arm portion for supporting the dross scraped up section, a support base for supporting the arm part, a drive unit for driving the arm portion, the reaction vessel through hole of Yes to be filtered dross
A dross treatment apparatus in a molten metal plating tank, comprising a ceramic filter . 2. A flux supply device provided in the vicinity of a hot-dip metal plating tank, a dust collection device for collecting vapor from the reaction tank, and an ash collection box , wherein the flux supply device has a storage unit for storing flux, receiving a supply unit for supplying <br/> flux, the flux supplied to the arm portion
2. A dross treatment apparatus in a hot-dip metal plating tank according to claim 1, further comprising a receiving tray .