JP2003171780A - Method for removing iron ion from phosphate chemical conversion treating liquid and iron ion remover for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of removing and controlling iron ions without deteriorating the chemical convertability of a phosphate chemical conversion treating liquid containing Fe<SP>2+</SP>ions by efficiently and easily removing the Fe<SP>2+</SP>ions from the phosphate chemical conversion treating liquid and controlling the concentration of the Fe<SP>2+</SP>ions to an adequate concentration range and an iron ion remover for the same. <P>SOLUTION: The method for removing the iron ions from the phosphate chemical conversion treating liquid containing the Fe<SP>2+</SP>ions consists of a process step (1) of feeding the treating liquid to a first vessel (i) having aeration means, a process step (2) of performing the aeration treatment in the first vessel (i) and a process step (3) of delivering the treating liquid from a second vessel (ii), in which the first vessel (i) and the second vessel (ii) are integrated in the lower part and a hopper (iii) is installed in the lower part of the integrated first vessel (i) and the second vessel (ii). <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

The present invention relates to relates to iron ion removal method and iron ion removal device of the phosphate chemical treatment solution, more particularly, Fe ²⁺ ions from the phosphate chemical conversion treatment liquid containing Fe ²⁺ ions TECHNICAL FIELD The present invention relates to an iron ion removing method and an iron ion removing apparatus for removing iron as sludge.

[0002]

2. Description of the Related Art When coating or plastic working various metal materials, the adhesion and corrosion resistance of the coating film are
Phosphate conversion treatment is generally carried out as a pretreatment for improving the lubricity for plastic working. As this pretreatment step, a degreasing treatment for removing an oxide film and oil content adhering to the surface of the steel material or the steel sheet,
After degreasing, water washing treatment, and / or acid pickling treatment for removing scales on the surface of steel materials and steel sheets, and water washing treatment after pickling, the formation of the chemical conversion film in the chemical conversion treatment, which is a post process, is favorably performed Surface conditioning treatment to do is performed if desired,
Next, a series of treatment steps of a phosphate chemical conversion treatment for improving lubricity, adhesion, and corrosion resistance and a post-chemical conversion water washing treatment are performed.

As the phosphate chemical conversion treatment liquid, a treatment liquid containing phosphate ions and zinc ions is usually added with an oxidizing agent such as nitrite ion, chlorate ion or nitrate ion as a film formation promoter. ing. Among them, when chlorate ion or nitrite ion is used as a film formation promoter, Fe ²⁺ ion eluted in the chemical conversion treatment is immediately oxidized to Fe ³⁺ ion to generate iron phosphate sludge. When only the film forming accelerator is used, Fe ²⁺ ions are not easily oxidized and accumulate in the treatment tank.

When the Fe ²⁺ ion concentration in the treatment tank is high,
Since the chemical conversion property (the degree to which a good chemical conversion film is formed) deteriorates, it is necessary to control within a certain range. However,
In order to lower the Fe ²⁺ ion concentration in the treatment tank, an oxidizer such as nitrite ion or chlorate ion is appropriately added to the Fe ²⁺ ion.
The method of precipitating ions is not practical because a large amount of iron phosphate sludge is generated at one time, which destroys the composition of the treatment bath and hinders the chemical conversion. In addition, the removal of Fe ²⁺ ions by ion exchange causes problems such as an increase in the maintenance cost of the ion exchange device and a change in the pH value of the chemical conversion treatment liquid obtained by ion exchange. Therefore, until now, the removal of Fe ²⁺ ions generated when nitrate ions were used as a film formation promoter in the phosphate chemical treatment solution was carried out easily and efficiently without affecting the treatment bath. The method and device (design) to be removed and controlled manually have not been established.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to
The phosphate chemical conversion treatment is carried out by efficiently and simply removing Fe ²⁺ ions from the phosphate chemical conversion treatment liquid containing e ²⁺ ions and controlling the Fe ²⁺ ion concentration within an appropriate concentration range. It is an object of the present invention to provide a method for controlling the removal of iron ions without deteriorating the chemical conversion property of the liquid and an iron ion removal device thereof.

[0006]

According to the present invention, there is provided a step (1) of feeding a phosphate chemical conversion treatment liquid containing Fe ²⁺ ions to a first tank (i) equipped with aeration means, the first tank mentioned above. A method of removing iron ions from a phosphate chemical conversion treatment liquid, comprising the step (2) of performing aeration treatment in (i) and the step (3) of delivering the phosphate chemical conversion treatment liquid from the second tank (ii). , Above first
The tank (i) and the second tank (ii) are integrated at the bottom, and the hopper is provided at the bottom of the integrated first tank (i) and second tank (ii). (Iii) is provided, which is a method for removing iron ions from a phosphate chemical conversion treatment liquid.

The above-mentioned phosphate chemical conversion treatment liquid is used in the second tank (i
In i), it is preferably heated.
In addition, the above-mentioned phosphate chemical conversion treatment liquid is a hopper (iii).
Is transferred to the filtration means (iv) as a phosphate chemical conversion treatment solution containing sludge from the lower part of the sludge, and after being filtered in the filtration means (iv), the filtrate is returned to the second tank (ii). Preferably there is. Further, the phosphate chemical conversion treatment liquid is filtered from the lower part of the hopper (iii) by the filtration means (i).
The third tank (v) is transferred to the third tank (v) through a branch path on the way to the v).
Is preferably integrated with the first tank (i) and the second tank (ii) at the bottom.

The present invention is also directed to desorption of a phosphate chemical conversion treatment liquid containing Fe ²⁺ ions, which comprises a first tank (i) equipped with aeration means, a second tank (ii), and a hopper (iii). In the iron device, the first tank (i) and the second tank (ii) are integrated at the bottom, and the hopper (i
ii) is the integrated first tank (i) and second tank (i)
It is also an iron ion removing device for a phosphate chemical conversion treatment liquid, characterized in that it is installed in the lower part of i).

The second tank (ii) is preferably provided with a heating means. Further, a filtration means (iv), a means for transferring the phosphate chemical conversion treatment liquid containing sludge from the lower part of the hopper (iii) to the filtration means (iv), and a second filtration solution from the filtration means (iv). Tank (ii)
It is preferable that a means for returning water to be provided. Furthermore, a third tank (v) integrated with the first tank (i) and the second tank (ii) at the bottom, and a hopper (iii).
The phosphate chemical conversion treatment liquid containing sludge is branched from the middle of the means for transferring the sludge-containing phosphate chemical conversion treatment liquid to the filtration means (iv), and the sludge-containing phosphate chemical conversion treatment liquid is transferred to the third tank (v). It is preferable that a means for doing so is provided. Hereinafter, the present invention will be described in detail.

The method for removing iron ions from the phosphate chemical conversion treatment liquid of the present invention comprises the step (1) of feeding the phosphate chemical conversion treatment liquid containing Fe ²⁺ ions to the first tank (i) equipped with aeration means. ) Is included. The target phosphate chemical conversion treatment liquid is not particularly limited as long as it contains Fe ²⁺ ions, and nitrite ions and chlorate ions as a film formation promoter in the treatment liquid containing zinc phosphate. Examples of the chemical conversion treatment liquid for treating various metal materials by using the chemical conversion treatment liquid to which the strong oxidant is not added can be mentioned. In particular, since the amount of steel material or steel wire per unit treatment liquid amount is large, when the Fe ²⁺ ions are accumulated at a high concentration, the iron ion removal method of the present invention can efficiently perform the treatment. It is suitable.

The Fe ²⁺ ion concentration in the phosphate chemical conversion treatment solution is preferably 0.01 to 15 g / L. If it is less than 0.01 g / L, the Fe ²⁺ ion concentration contained is low, and therefore it is not necessary to remove it, or the Fe ²⁺ ion cannot be efficiently removed. When it exceeds 15 g / L, the chemical conversion property is deteriorated, so that there arises a problem that a good film cannot be obtained.

As the aeration means, any means capable of supplying sufficient oxygen to the first tank (i) in order to oxidize Fe ²⁺ ions in the phosphate chemical conversion treatment solution to Fe ³⁺ ions The method is not particularly limited, and examples thereof include use of an air diffusing tube and a draft tube method. The aeration amount is
It can be appropriately determined according to the required Fe ²⁺ ion reduction rate, equipment specifications, and the like.

The aeration means in the first tank (i) is preferably installed below the first tank (i) from the viewpoint of efficient processing. In the present specification, the lower part means a position lower than (1/2) H from the bottom when the height of a certain device is H, and preferably (1/3) H from the bottom. Is less than the position (1), more preferably less than the position (1/4) H from the bottom, and even more preferably the bottom of the device. In short, it is preferable to install the liquid flow (turbulent flow) generated by aeration at the bottom as much as possible in a place where it does not disturb the rising laminar flow of the adjacent second tank (ii).

The phosphate chemical conversion treatment liquid containing Fe ²⁺ ions is preferably fed from the upper part of the first tank (i). In the present specification, the upper portion means a case where the height of a certain device is H or more and a position of (1/2) H or more from the bottom, and preferably (2/3) H from the bottom. Or more, more preferably from the bottom (3/4) H or more, and further preferably the upper surface of the device.

The capacity of the first tank (i) is the required F
It can be appropriately determined ^{depending on the} e ²⁺ ion reduction rate, equipment specifications, and the like. From the elution rate of Fe ²⁺ ions eluted from a base material such as a steel plate or steel when the phosphate chemical conversion treatment is continuously performed, the phosphoric acid by the method for removing iron ions of the phosphate chemical conversion solution of the present invention It is preferable that the reduction rate of Fe ²⁺ ions in the chlorination solution is designed to be faster or equal. The height of the first tank (i) can be efficiently treated with a small aeration amount when the height is higher, but it can be determined according to the regulations and specifications of the installation place.

The residence time of the phosphate chemical conversion treatment liquid in the first tank (i) should be such that Fe ²⁺ ions in the liquid can be oxidized to Fe ³⁺ ions by aeration treatment. It is not particularly limited as long as it is, for example, about 10 minutes to 2 hours. In the present specification, the first tank (i) means a tank equipped with aeration means.

In the method for removing iron ions from the phosphate chemical conversion treatment liquid of the present invention, after the above step (1), the first tank (i) is used.
(2) of performing aeration in the second tank (i)
The step (3) of delivering the phosphate chemical conversion treatment solution from i) is performed. Here, the first tank (i) and the second tank (ii) are integrated in the lower part. In the present specification, the term "integrated" means that the first tank (i) and the second tank (i
It means that the phosphate chemical conversion treatment liquid can be circulated between i) and i), and its form does not matter. Further, the second tank (ii) means a tank which is integrated with the first tank (i) in the lower part and in which the phosphate chemical conversion treatment liquid is sent out and the sludge generated at that time is settled down. It is a thing. The integration position of the first tank (i) and the second tank (ii) is preferably lower than the installation position of the aeration means in the first tank (i).

In the second tank (ii), the phosphate chemical conversion treatment liquid flows in the second tank (ii) at a linear velocity lower than the sedimentation velocity of the sludge generated. It is preferable to secure the surface area of. Regarding the liquid transfer rate in the above step (1) and step (3), the first tank (i)
Can be determined from the residence time and / or the linear velocity in the second tank (ii).

The phosphate conversion treatment liquid is aerated by the aeration treatment in the first tank (i) in the step (2), whereby Fe ²⁺ ions in the liquid are oxidized to Fe ³⁺ ions, and then, mainly, In the two tanks (ii), Fe ³⁺ ions become iron phosphate sludge. In the first tank (i), the lower the solution temperature, the higher the dissolved oxygen concentration,
Fe ²⁺ ions can be efficiently oxidized, and
In the second tank (ii), the sludge formation reaction is promoted as the temperature becomes higher. Therefore, in the present invention, it is preferable to heat in the second tank (ii), more preferably in a position separated from the first tank (i). In the present specification, the separated positions are not required to be heated directly to the first tank (i), and preferably the surface where the first tank (i) and the second tank (ii) are in contact with each other. It is preferably installed on the side surface opposite to. The heated position in the second tank (ii) is preferably the lower part of the second tank (ii) from the viewpoint of sludge efficiency.

In the present invention, the above integrated first
At the bottom of the tank (i) and the second tank (ii), the hopper (i
ii) is installed. The upper end of the hopper (iii) is opened and connected to the lower ends of the integrated first tank (i), second tank (ii) and optionally the third tank (v). There is. The third tank (v) will be described later.

Since sludge generated mainly in the second tank (ii) accumulates at the bottom of the hopper (iii), the phosphate chemical conversion treatment liquid containing sludge is continuously or periodically taken out. Preferably, an opening is provided in the lower part of the hopper (iii).

From the lower part of the hopper (iii), the phosphate chemical conversion treatment liquid containing sludge is transferred to the filtering means (iv) through the opening, usually by a pump,
It is preferably filtered in the filtration means (iv).
The filtering means (iv) separates the sludge into a filtrate, and the sludge is taken out and disposed of, etc.
Since the filtrate generally does not contain sludge, it is returned to the chemical conversion treatment main tank or the second tank (ii), preferably the second tank (ii) for the phosphate chemical conversion treatment of the article to be coated. ,
More preferably, in order to reduce the rising speed of the liquid in the second tank (ii) as much as possible, it is desirable to return water to the upper part of the second tank (ii).

Since the filtering means (iv) normally operates at regular intervals, the hopper (ii)
The phosphate conversion treatment liquid containing sludge discharged from the lower part of i) is in the process of being transferred from the lower part of the hopper (iii) to the filtering means (iv) when the filtering means (iv) is not operating. It is preferably returned through a branch or bypass. In addition, the hopper (i
Also for the purpose of adjusting the transfer flow rate from the lower part of ii) to the filtration means (iv), it is preferable that the above bypass is installed.

Here, since the phosphate chemical conversion treatment liquid passing through this branch contains the sludge of Fe ²⁺ ions, it is preferable to perform the aeration treatment again in the first tank (i). It is preferable that the first tank (i) and the second tank (ii) are returned to the third tank (v) which is a tank different from the first tank (i) and the second tank (ii). As the installation position of the third tank (v), the phosphate chemical conversion treatment liquid containing sludge in the third tank (v) should not be mixed with the phosphate chemical conversion treatment liquid flowing in the second tank (ii). In the second tank (i
It is preferable that the position is separated from i). More preferably, the first tank (i) is installed between the second tank (ii) and the third tank (v). In the present specification, the third tank (v) means the first tank (i) and the second tank (i).
It is a tank different from the tank (ii) and means a tank integrated with these tanks at the bottom.

The shape of the hopper (iii) is usually
It is a funnel type, and one or more may be installed. It is preferable that the height and the width are set so that the sludge can be settled, that is, the angle of repose or more. When the angle of repose is δ, the height of each hopper (iii) is h, and the width of the upper surface is w,
The height and the width of the upper surface of each hopper can be set so as to satisfy the following expression tan (1/2 · δ) ≧ (1/2 · w) / h. The width of the hopper (iii) is usually the sum of the widths of the first tank (i), the second tank (ii), and optionally the third tank (v) divided by the number of hoppers. It is the number.

The phosphate chemical conversion treatment liquid treated as described above is delivered from the second tank (ii). The above-mentioned position to be delivered is preferably the upper part of the second tank (ii) because it is necessary to deliver the phosphate chemical conversion treatment liquid containing no sludge. More preferably, the second tank (i
That is, the phosphate chemical conversion treatment liquid overflowing from i) is delivered. The phosphate chemical conversion treatment liquid sent from the second tank (ii) is returned to the chemical conversion treatment main tank for performing the phosphate chemical conversion treatment on the object to be coated.

Removal of iron ions from the phosphate chemical conversion treatment liquid of the present invention
Removal device is a method for removing iron ions from the above-mentioned phosphate chemical conversion treatment liquid.
It can be preferably used for. That is, aeration
A first tank (i), a second tank (ii), and a ho
Fe consisting of a top (iii) ²⁺Phosphate containing ions
A deferring apparatus for chemical conversion treatment liquid, which comprises the above first tank (i) and
The second tank (ii) is the one integrated at the bottom.
The hopper (iii) has the integrated first
It is installed under the tank (i) and the second tank (ii).
Fe ion removal device for phosphate chemical treatment liquid characterized by
Is.

The second tank (ii) is preferably provided with a heating means. The installation position of the heating means is preferably a position separated from the first tank (i). Examples of the heating means include a plate heater and a heat exchanger such as a flexible tube which have been generally used conventionally.

The iron ion removing apparatus for the phosphate chemical conversion treatment liquid of the present invention further comprises a filtering means (iv) and a hopper (ii).
There are means for transferring the phosphate chemical conversion treatment liquid containing sludge from the lower part of i) to the filtration means (iv), and means for returning the filtrate from the filtration means (iv) to the second tank (ii). It is preferably provided. The filtering means (i
Examples of v) include a pressure filter and the like. Further, as a means for transferring the phosphate chemical conversion treatment liquid containing sludge from the lower part of the hopper (iii) to the filtration means (iv), a transfer rate can be adjusted by a pump and / or a bypass pipe. A pipe etc. can be mentioned. As a means for returning the filtered liquid from the filtering means (iv) to the second tank (ii), a liquid feed pipe or the like can be used.

The iron ion removing apparatus for the phosphate chemical conversion treatment liquid of the present invention further includes the first tank (i) and the second tank (i).
The third tank (v) integrated with i) and the lower part, and the means for transferring the phosphate chemical conversion treatment solution containing sludge from the lower part of the hopper (iii) to the filtration means (iv) are branched from the middle. It is preferable that a means for transferring the phosphate chemical conversion treatment liquid containing the sludge to the third tank (v) is provided.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION An iron ion removing method and an iron ion removing apparatus for a phosphate chemical conversion treatment liquid of the present invention will be described with reference to FIG. FIG. 1 shows a preferred embodiment of an iron ion removing apparatus for a phosphate chemical conversion treatment liquid of the present invention. In FIG. 1, the flow path of the phosphate chemical conversion treatment liquid is shown by a dotted line.
In the iron ion removing apparatus 9 of FIG. 1, first, a phosphate chemical conversion treatment liquid containing Fe ²⁺ ions obtained by subjecting an object to be subjected to a phosphate chemical conversion treatment to a chemical conversion treatment for performing the phosphate chemical conversion treatment. Liquid is transferred from the main treatment tank (not shown) to the first tank 1. The first tank 1 is provided with aeration means 2, and the aeration process by the aeration means 2 allows Fe ^{2+ in} the liquid to be contained.
Ions are oxidized to Fe ³⁺ ions.

The Fe ³⁺ ions produced in the first tank 1 react with phosphoric acid in the first tank 1 and the second tank 3 to form iron phosphate sludge, which is integrated with the first tank 1 in the lower portion. When heated by the heating means 4 installed in the second tank 3, it becomes sludge easily. The heating means 4 is preferably installed at a position separated from the first tank 1.

The sludge generated in the second tank 3 settles and accumulates at the bottom of the hopper 5 installed in the lower part of the first tank 1 and the second tank 3. Here, the first tank 1
The second tank 3 and the second tank 3 are integrated at the bottom, and a hopper 5 is further provided below the second tank 3.

The phosphate chemical conversion treatment liquid containing sludge accumulated at the bottom of the hopper 5 is transferred to the filtration means 6 via a pump, and the filtration means 6 performs intermittent or continuous filtration treatment. After that, the sludge is taken out and disposed of, and the filtrate is returned to the second tank 3.

When the processing by the filtering means 6 is intermittent or the flow rate needs to be adjusted, the hopper 5
The water is returned to the third tank 7 through the branch passage on the way from the lower part to the filtering means 6. The third tank 7 is the first
It is integrated with the tank 1 and the second tank 3 at the lower part, and the lower part is further connected to the hopper 5.

The phosphate chemical conversion treatment liquid treated as described above is stored in the overflow tank 8 provided above the second tank 3.
Then, it is returned to the chemical conversion treatment main tank for the phosphate chemical conversion treatment of the article to be coated. Phosphatization solution is the back, because one in which Fe ²⁺ ion in the liquid was removed by sludge after a Fe ^{3 +} ion, Fe ²⁺ ions is in the low concentration .

[0037]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. Example 1 (1) Preparation of Fe ²⁺ Ion-Containing Zinc Phosphate Treatment Bath A 16% aqueous solution of Surfdlow C310 building bath agent (a zinc phosphate treatment agent manufactured by Nippon Paint Co., Ltd.) was prepared. 53-
Heated to 57 ° C. Steel wool was immersed in this to dissolve the steel wool, and Fe ²⁺ ions were accumulated in the treatment bath. At this time, since hydrogen ions were consumed by the reaction to raise the pH, surfdlow C310 replenisher (a zinc phosphate treating agent manufactured by Nippon Paint Co., Ltd.) was appropriately added to keep the treating bath composition in a treatable state.

(2) Iron ion removing device The processing device shown in FIG. 2 was prepared and used for the experiment. In addition,
No heating means was provided in the second tank. Chemical conversion tank: The volume was 10 L, and the bath temperature was kept at around 55 ° C. 1st tank: 2L capacity Aeration means: Air diffuser (blowing compressed air from a compressor) 2nd tank: 1L capacity (0.01m ² surface area) Hopper: 1L Using the above iron ion removal device, the conditions shown in Table 1 Was used to remove iron ions. Removal processing time 0 (at the start) to 5
After 1 hour, the iron ion concentration in the bath, sludge removing property, and chemical conversion property were evaluated as follows every hour. The results are shown in Table 1.

(3) Evaluation item a) Iron ion (Fe ²⁺ ion) concentration in the bath The iron ion concentration in the treatment bath of this tank was measured using an atomic absorption spectrometer. b) The liquid returned from the sludge removing iron ion removing device is filtered with a filter paper,
The presence or absence of sludge was visually determined. ◯: No sludge is found Δ: Minimal amount of sludge is present x: Sludge is present c) Chemical-formed steel wire (S45C, wire diameter 0.01 m) is pickled (10% H ₂
What was soaked with SO ₄ at 60 ° C. for 3 minutes and then washed with water) was visually evaluated for the appearance of the treatment when immersed in a chemical conversion tank at 55 ° C. for 10 minutes. ○: Uniform gray-white film △: Film with some scales ×: No film formation or defective film

[0040]

[Table 1]

Example 2 The treatment was carried out in the same manner as in Example 1 except that a heating means (throwing heater) was installed at the bottom of the second tank, and the iron ion concentration in the bath, sludge removing property, and chemical conversion property were evaluated. . The results are shown in Table 2.

[0042]

[Table 2]

Comparative Example 1 Instead of aeration, 5% 4% NaNO ₂ aqueous solution was added to the first tank.
The treatment was carried out in the same manner as in Example 1 except that the solution was dropped at a rate of mL / min, and the iron ion concentration in the bath, sludge removing property, and chemical conversion property were evaluated. The sludge did not settle due to the treatment and overflowed from the second tank to the chemical conversion treatment main tank. The results are shown in Table 3.

[0044]

[Table 3]

In Comparative Example 1, a large amount of sludge was generated,
The chemical composition deteriorated because the bath composition was out of balance.
Also, the sludge composition becomes buoyant, and
Due to a large amount of generation, it could not settle in the second tank and overflowed. On the other hand, in Examples 1 and 2, Fe ²⁺ ions in the bath could be efficiently and simply removed as the iron phosphate sludge over the treatment time without affecting the chemical conversion properties. In particular, in Example 2 in which the heating means was installed in the second tank, Fe ²⁺ ions could be removed more efficiently.

[0046]

INDUSTRIAL APPLICABILITY In the method and apparatus for removing iron ions from the phosphate chemical conversion treatment liquid of the present invention, the phosphate chemical conversion treatment liquid containing Fe ²⁺ ions is aerated in the first tank (i). ^Causes Fe ²⁺ ions in the liquid to be oxidized to Fe ³⁺ ions, and thereafter, mainly in the second tank (ii), Fe ³⁺ ions become sludge, and the generated sludge accumulates in the hopper (iii). Therefore, iron ions can be removed efficiently and simply without adversely affecting the processability. Therefore, the phosphate chemical conversion treatment liquid used in chemical conversion treatment of various steel plates and steel materials, among them, F
It can be suitably used for a phosphate chemical conversion treatment liquid containing a large amount of e ²⁺ ions in the treatment bath.

[Brief description of drawings]

FIG. 1 is a schematic view showing a preferred embodiment of an iron ion removing apparatus for a phosphate chemical conversion treatment liquid of the present invention.

FIG. 2 is a schematic diagram of an iron ion removing apparatus for the phosphate chemical conversion treatment liquid of the present invention used in Examples.

[Explanation of symbols]

1st tank 2 Aeration means 3 second tank 4 Heating means 5 hopper 6 Filtering means 7 Third tank 8 overflow tank 9 Iron ion removal device

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kimio Kimimura             4-1, 15 Minami-Shinagawa, Shinagawa-ku, Tokyo Japan             Within Paint Co., Ltd. (72) Inventor Akihiro Uematsu             26-20 Ekimachi, Suita City, Osaka Prefecture Japan Pay             Plant Engineering Co., Ltd.             Within (72) Inventor Jun Maruoka             26-20 Ekimachi, Suita City, Osaka Prefecture Japan Pay             Plant Engineering Co., Ltd.             Within F-term (reference) 4D034 AA11 CA01                 4D050 AA13 AB55 BB01 BC01 BD02                       BD03 BD06 CA15 CA16                 4D059 AA11 AA19 BE15 BE31 BE51                       BK16 CA28                 4K026 AA02 AA22 AA24 AA25 BA03                       BA04 BB06 DA19 DA20 EA12

Claims (8)

[Claims] 1. A step (1) of feeding a phosphate chemical conversion treatment liquid containing Fe ²⁺ ions to a first tank (i) equipped with aeration means, and a step of aeration processing in the first tank (i). A method for removing iron ions from a phosphate chemical conversion treatment liquid, comprising: (2) and a step (3) of delivering the phosphate chemical conversion treatment liquid from the second tank (ii), wherein the first bath (i) And the second
The tank (ii) is integrated at the bottom, and a hopper (iii) is installed at the bottom of the integrated first tank (i) and second tank (ii). A method for removing iron ions from a phosphate chemical conversion treatment liquid, comprising: 2. The phosphate chemical conversion treatment liquid is the second tank (ii).
The method for removing iron ions from the phosphate chemical conversion treatment liquid according to claim 1, wherein the method is heating. 3. The phosphate chemical conversion treatment liquid is a hopper (ii).
The phosphate conversion treatment liquid containing sludge is transferred from the lower part of i) to the filtration means (iv), and the filtration means (iv) is transferred.
The method for removing iron ions from the phosphate chemical conversion treatment liquid according to claim 1 or 2, wherein the filtered liquid is returned to the second tank (ii) after being filtered in. 4. The phosphate chemical conversion treatment liquid is a hopper (ii).
The third tank (v) is transferred to the third tank (v) from a lower part of i) through a branch path on the way to the filtering means (iv), and the third tank (v) is the first tank (i). ) And the second tank (ii) are integrated at the bottom with the method for removing iron ions from the phosphate chemical conversion treatment liquid according to claim 3. 5. A deferring device for a phosphate chemical conversion treatment liquid containing Fe ²⁺ ions, comprising a first tank (i) equipped with aeration means, a second tank (ii), and a hopper (iii). The first tank (i) and the second tank (ii) are integrated in the lower portion, and the hopper (iii) is integrated with the integrated first tank (i) and the second tank (ii). An iron ion removing device for a phosphate chemical conversion treatment liquid, which is installed at the bottom of two tanks (ii). 6. The iron ion removing apparatus for a phosphate chemical conversion treatment liquid according to claim 5, wherein a heating means is installed in the second tank (ii). 7. A filter means (iv) and a hopper (i)
a means for transferring the phosphate chemical conversion treatment liquid containing sludge from the lower part of ii) to the filtration means (iv), and a means for returning the filtrate from the filtration means (iv) to the second tank (ii). An iron ion removing device for a phosphate chemical conversion treatment liquid according to claim 5 or 6, which is provided. 8. A first tank (i) and a second tank (ii)
And a third tank (v) integrated with the lower part, and a means for transferring the phosphate chemical conversion treatment liquid containing sludge from the lower part of the hopper (iii) to the filtering means (iv) is branched from the middle of the means. The means for transferring the phosphate chemical conversion treatment liquid containing the sludge to the third tank (v) is provided.
An iron ion removing device for the phosphate chemical conversion treatment liquid described.