JPH06192896A - Method and device for dissolving plating metallic material - Google Patents

Abstract

PURPOSE:To prevent the generation of dust from a fine plating metal and to dissolve the plating metal in a plating soln. at a high rate in the metal plating using an insoluble anode by mixing the plating metal with the plating soln. and dissolving the metal in the soln. CONSTITUTION:The plating metal ion in a plating soln. consumed in plating is replenished in a metal plating device using an insoluble anode. In this case, a plating metal powder M in a receiving tank 1 is charged into a solid-liq. mixing tank 3 by a feeder 2 and mixed with a plating soln. having a low content of plating metal ion from a pipeline 12 to obtain a slurry, the slurry is supplied to a dissolution tank 4 through a pipeline 9 provided with a pump 6 and sufficiently agitated to dissolve the metal M in a plating soln. to replenish the plating metal ion, and the slurry is returned to the plating tank. Since the fine-powder plating metal M is slurried, the loss due to the generation of dust is eliminated, and the metal is dissolved in the plating soln. at a high rate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for transporting and dissolving a metallic raw material for plating for replenishing a plating solution with metal ions such as zinc consumed in an electrogalvanizing facility using an insoluble anode.

[0002]

2. Description of the Related Art Conventionally, a method of replenishing a plating solution with metal ions such as zinc consumed in an electrogalvanizing facility using an insoluble anode is to dissolve a metal powder or a metal compound in the plating solution. . It is preferable that these raw materials have a large particle size from the viewpoint of easiness of handling at the time of pneumatic transportation or transportation by a screw conveyor or the like. Taking zinc ions as an example, it is preferable to use zinc oxide powder with a particle size of 300 μm or more as the starting material, and metal zinc powder with a particle size of 1 mm or more. When dissolved in a liquid, there is a problem that the dissolution rate is low, and it goes without saying that a finer particle size is advantageous from the viewpoint of solubility. However, when the particle size of the raw material to be received is small, the dust generation from the joint of the screw conveyor used for transportation and the dust generation at the inlet to the melting tank is extremely large, and this dust is fixed around by the fumes of the plating solution. There were problems such as clogging and leakage, and improvements were desired.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves these problems, and transports and dissolves a plating solution raw material which is excellent in solubility while satisfying the transportability of the raw material and environmental resistance such as dust generation. The purpose is to realize the technology.

[0004]

The method for dissolving a metal raw material for plating according to the present invention is to mix the received metallic raw material with a plating solution, form a slurry, and convey the slurry to a melting tank to dissolve it in the melting tank. Characterize. Further, the apparatus for dissolving a metal raw material for plating of the present invention is provided with a mixing means and a slurry transportation facility for mixing the metal raw material with a plating solution to form a slurry between a receiving tank for the metal raw material and a dissolving tank. It is characterized by that.

[0005]

[Operation] According to the present invention, as the raw material to be received, a fine particle having excellent solubility is used without considering the possibility of dust generation, transportability, etc., and this is mixed with the plating solution immediately after receiving. Then, since the slurry is conveyed to the melting tank in a slurry state by a closed slurry pipe, dust generation at the conveying stage is eliminated and a high melting speed in the melting tank can be realized.

The slurry concentration is preferably 20% or less by weight. If the concentration is higher than this, it becomes hard and the transportability of the slurry is poor. On the other hand, if it is too thin, the transport efficiency will decrease and the capacity of the tank etc. will increase,
Needless to say, it is not preferable.

[0007]

EXAMPLE FIG. 1 shows a melting apparatus according to a first example of the present invention. 1 is a raw material hopper, 2 is a cutting device, 3 is a solid-liquid mixing tank, 4 is a dissolution tank, 5 is a circulation tank, 6 is a slurry pump,
7 is a liquid feed pump, 8 is a plating solution circulation pump, 9 is a slurry pipe, 10 is a line tank going pipe, 11 is a line tank return pipe, 12 is a melting equipment feeding pipe, and M is a raw material. Zinc powder (JIS special powder product, average particle size 0.3 μm).

The composition of the plating solution in this embodiment was such that the sulfuric acid bath contained zinc ions of 35 g / l and the pH was 1.7,
The liquid temperature is 50 ° C. An appropriate amount of the raw material M received in the raw material hopper 1 is cut out by a cutting device 2 such as a screw feeder and directly dropped into the solid-liquid mixing tank 3, and the melting equipment feed pipe 12
A part of the return plating solution from the circulation tank by and the raw material M are mixed to form a slurry with a weight of 5%.
The slurry-like raw material was sent to the melting tank 4 by means of a slurry transporting facility composed of the slurry pipe 9 and the slurry pipe 9. The slurry transportation conditions were a pressure of 5 kgf / cm ² , a head of 10 m, and a discharge rate of 10 m ³ / H, but it was successfully transported.

The raw material slurry charged in the dissolution tank 4 was dissolved in the plating solution while stirring with a built-in stirrer. Compared to the case of direct dissolution from conventional powder, the result of primary dissolution was carried out in the previous stage of the dissolution tank, which is about 10% of the dissolution compared to the case of direct dissolution from conventional powder. Speed improvements were seen. The supernatant liquid of the dissolution tank 4 is sent to the circulation tank 5 by the liquid feed pump 7, and circulated between the line tank going pipe 10 and the line tank return pipe 11 by the plating liquid circulating pump 8 and a line tank not shown, A part of the plating solution from the plating solution circulation pump 8 is returned to the solid-liquid mixing tank 3 and the dissolution tank 4 for slurry mixing and raw material dissolution.

Although the example of zinc oxide powder was shown as a raw material, the same results were obtained in the case of metal zinc powder, other metal oxides, and metal powders, and there was no problem in transportation and it was excellent. Solubility is obtained.

[0011]

According to the present invention, since the received raw material is directly charged into the solid-liquid mixing tank, problems such as clogging and dust generation do not occur at all, and the solubility is good without considering the transportability. A raw material having a small particle size can be selected, the working environment is improved, and a high dissolution rate can be obtained, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 Raw material hopper 2 Cutting device 3 Solid-liquid mixing tank 4 Melting tank 5 Circulating tank 6 Slurry pump 7 Liquid feeding pump 8 Plating liquid circulating pump 9 Slurry piping 10 Line tank going piping 11 Line tank return piping 12 Melting equipment feeding piping M Raw material

Claims (2)

[Claims] 1. A method for dissolving a metallic raw material for plating to replenish consumed metal ions into a plating solution,
A method for dissolving a metallic raw material for plating, characterized in that the received metallic raw material (M) is mixed with a plating solution, is made into a slurry and is conveyed to a dissolving tank (4), and is dissolved in the dissolving tank (4). 2. An apparatus for dissolving a metallic raw material for plating for replenishing consumed metal ions into a plating solution,
Mixing means (3) for mixing the metallic raw material (M) with the plating solution to form a slurry between the receiving tank (1) for receiving the metallic raw material (M) and the dissolving tank (4), and a slurry transport facility ( 6, 9)
An apparatus for melting a metallic raw material for plating, characterized by being provided with.