JPH0339500A - Recovering method for plating liquid - Google Patents

Abstract

PURPOSE:To easily recover the carried-out plating liquid by introducing high- concn. fundamental liquid into a recovery device as plating liquid before recovered dilute plating liquid is introduced into the recovery device and thereafter introducing this recovered dilute plating liquid thereinto and performing concentration to recover the plating liquid. CONSTITUTION:Plating liquid 3 which is stuck on a body to be treated and carried out from a plating treatment tank 5 is mixed and diluted with the recovered washing water 10. This recovered dilute plating liquid 4 is introduced into a recovery device 19. Vapor generated in the case of performing concentration is recovered as the washing water 10. Concentrate is returned to the plating treatment tank 5 as the recovered return plating liquid 13 to recover the plating liquid. Therein high-concn. fundamental liquid 14 described hereunder is introduced into the recovery device 9 as plating liquid. Even when this fundamental liquid 14 is concentrated before the recovered dilute plating liquid 4 is introduced into the recovery device 9, the component of plating liquid is not decomposed. Thereafter the recovered dilute plating liquid 4 is introduced and concentration is performed to recover the plating liquid. Thereby the need for drainage treatment is eliminated because the diluted plating liquid is recovered and reutilized.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is a method for collecting and reusing the plating solution taken out when plating the surface of an object to be plated. It is about the method.

[Conventional technology]

A conventional device for recovering plating solution of this type was constructed as schematically shown in FIG. 2 and was reused. That is, in FIG. 2, 1 is a plating apparatus, and a plating treatment tank 5. A diluted plating solution tank 6 that adheres to the object to be plated and is taken out as a plating solution 3 and stored as a recovered diluted plating solution 4
．． Each of them is provided with a washing water tank 7 in which collected washing water 10 is accommodated. 8 is a first recovery stock tank in which the recovered diluted plating 1α4 is stored; 9 is a recovery device in which the recovered diluted plating solution 4 from the first recovery stock tank 8 is taken in and concentrated, and the steam generated at this time is is recovered and used as washing water 10 in a condenser in the recovery device 9. On the other hand, the concentrated plating solution is stored in a second recovery stock tank 12 as a recovery stock liquid 11, and a recovery return liquid 1
3 is recovered in the plating treatment tank 5.

Next, the operation will be explained.

The concentration of the plating solution in the plating tank 5 of the plating device 1 adheres to the product, which is the object to be plated, and becomes the plating solution 3 that is carried out, and this is stored in the first recovered stock tank 8 as the recovered diluted plating solution 4. This is concentrated using a recovery device 9, and the water that evaporates at that time is converted into water by a condenser in the recovery device 9, which is recovered and used as washing water 10.

On the other hand, the recovered diluted plating solution 4 is reduced to the plating solution concentration and is transferred to the second recovered stock tank 1 as recovered stock solution 11.
2, the plating solution is returned to the plating treatment tank 5 as a recovered return liquid 13, and the plating solution is recovered.

[Problem to be solved by the invention]

In the plating solution recovery method configured as described above, the recovered diluted plating solution 4 taken out as the carried-out plating solution 3 is
It is possible to recover strong acid 2 strong alkaline type plating solutions, but plating solutions that are easily diluted with neutral type plating solutions will be decomposed when concentrated and collected, and the plating solution will be recovered as plating solution 2. There was a problem that made it unusable.

This invention was made in order to solve the above-mentioned problems, and aims to provide a method for recovering a plating solution that enables concentrated recovery of a recovered diluted plating solution that tends to change. .

[Means to solve the problem]

In the plating solution recovery method according to the present invention, a highly concentrated basic solution in which the components of the plating solution do not decompose even if IIL reduction is performed before the recovered diluted plating solution is introduced into the recovery device as a plating solution is then introduced into the recovery device. This system takes in the recovered diluted plating solution, concentrates it, and recovers it.

[Effect]

In this invention, a highly concentrated basic solution whose components do not decompose even when concentrated is used as the plating solution, and this plating solution is taken into a recovery device before taking in the recovered diluted plating solution, and then the recovered diluted plating solution is taken in. Since the plating solution is concentrated at 100 mL, the effect of the stabilizer added to the plating solution is activated, and there is no decomposition change in the plating solution even if the plating solution is heated and concentrated. It can be recovered.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

In Figure 1, the same symbols as in Figure 2 indicate the same things,
Reference numeral 14 denotes a highly concentrated basic solution whose components in the plating solution do not decompose even when concentrated, and this is stored in the plating treatment tank 5 as the plating solution 2.

In this operation, before the recovered diluted plating solution 4 is introduced into the recovery device 9, the high concentration basic solution 14 is introduced into the recovery device 9 and the concentration operation is started. and recovered as washing water 10. After this, the water is circulated as washing water 10. - The plating solution larger than the window, for example, the recovered stock liquid 11 that has been concentrated to about twice the concentration, is stored in the second recovered stock tank 12, taken out as a recovery return tank 13, and returned to the plating processing tank 5 as a replenishment plating. Collected in a closed system.

When the plating solution recovery method of the present invention is used, the highly concentrated base solution 14 is made into a concentrated base solution, so that there is no decomposition of the plating solution. If the plating solution is kept at a certain high concentration, the chemical added as a stabilizer to the plating solution will cause plating to occur even if the plating solution is heated to about 50°C by vacuum concentration. No liquid decomposition, 15% concentration to 75%
It was possible to obtain good plating even when the solution was concentrated to 100%, diluted to the standard, and plated at a plating solution concentration.

A specific example is shown below.

(Highly concentrated basic solution) (Concentrated) (Diluted plating solution), W machine acid 100nJ 500nJ 250
mt'tinconk 50tnj 250nJ
125-L/l dokonk 6+nj
30rn115-Plidner 10 mj
50 ml 25 ml PH adjuster 5
0m1250mj 125mlThe concentrated liquid can also be used as a sufficient replenishment liquid.

Further, by using this invention, it is possible to achieve a significant reduction in light weight.

〔Effect of the invention〕

As explained above, in the present invention, before the collected diluted plating solution is taken into the recovery device, a highly concentrated basic solution whose components of the plating solution do not decompose even if the raw cotton is removed is taken into the recovery device as the plating solution, concentrated, and recovered. Therefore, it is now easier to recover the plating solution taken out, which could not be recovered in the past, and recycled plating solution (
Since it can be used as a take-out plating line 10 (H'/day x 25 days x 12 months x 1/2,500 yen = 75,000 yen/year), it has a remarkable cost reduction effect even in an in-shell plating line, and it is also easy to recover. Because it is reused, wastewater treatment is also not necessary.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram for explaining an embodiment of the plating solution recovery method of the present invention, and FIG. 2 is a configuration diagram for explaining a conventional plating solution recovery method. In the figure, 1 is a plating device, 2 is a plating solution, 3 is a plating solution to be carried out, 4 is a recovered diluted plating solution, 5 is a plating treatment tank, 6 is a diluted plating solution tank, 7 is a washing water tank, and 8 is a first recovery tank. A stock tank, 9 a recovery device, 10 washing water, 11 recovery stock liquid, 12 a second recovery stock tank, 13 recovery return liquid, and 14 high concentration base liquid. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] The plating solution that adheres to the object to be plated and is taken out of the plating tank is mixed with the recovered washing water, and the recovered diluted plating solution is taken into a recovery device and concentrated. In the plating solution recovery method, the steam generated during the plating process is recovered as the washing water, and the concentrated solution is returned to the plating tank as the recovered return plating solution, before the recovered diluted plating solution is taken into the recovery device. A method for recovering a plating solution, characterized in that a highly concentrated basic solution whose components of the plating solution do not decompose even when concentrated is taken into the recovery device as a plating solution, and then the recovered diluted plating solution is taken in, concentrated, and recovered. .