JP3542676B2 - Apparatus for removing scale generated on the surface of wire and method for removing scale using this apparatus - Google Patents

Description

【００２３】
表１の廃液量の結果から、実施例１〜３のいずれも、従来例に比し、廃液量が大幅に減少し、しかも、中間処理槽において酸洗処理も同時に行うことができるので、酸洗処理槽におけるスケール除去量を少なくすることができるので、酸洗処理槽の液温を 5〜10℃程度下げることができ、かつ補給する塩酸量( 図で＋ｅ）も20〜30l/h だけ低減させることができる。
尚、酸洗処理槽の酸洗液を中間処理槽で再利用しない比較例１と、水洗処理槽の水を中間処理槽で再利用しない比較例２は、却って従来例に比し、廃液量が多くなることがあった。
また、実施例１〜３で廃液量の最大値で比較すると、冷却処理槽を２個設けた実施例１の廃液量が最も少なく、次いで、冷却処理槽が１個で流量を精密に調整した実施例２，３が少なかった。
【００２４】
【発明の効果】
本発明によれば、連続処理によって処理能力の低下した、酸洗処理槽の酸洗液と水洗処理槽の水とを有効利用することによって、廃液量を大幅に低減させることができる。
また、冷却処理槽の少なくとも１個に、線材を所定温度に冷却する手段、好ましくは、冷却水の流量の制御によって行う冷却手段を設けることによって、酸洗処理槽に入る直前の線材温度を制御することができる。
加えて、中間処理槽に液温センサーを設け、この液温センサーによって、中間処理槽の液温の変動を感知し、この液温の変動に応じて前記冷却手段を作動させて、中間処理槽の液温を所定温度に保持することにより、酸洗処理槽に入る直前の線材温度をより精密に制御することができる。
【図面の簡単な説明】
【図１】本発明に従う代表的なスケール除去装置の概念図である。
【図２】本発明に従う他のスケール除去装置の概念図である。
【図３】従来例のスケール除去装置の概念図である。
【図４】比較例２のスケール除去装置の概念図である。
【図５】比較例１のスケール除去装置の概念図である。
【符号の説明】
1,2 冷却処理槽
3 中間処理槽
4 酸洗処理槽
5 水洗処理槽
6 水供給手段
7 酸洗液供給手段
8 スクラバー
9 フード
H 熱処理炉
W 線材[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus for removing scale generated on the surface of a wire by a series of steps of cooling, pickling, and rinsing a heat-treated long wire and a method for removing scale using the apparatus. In particular, an object of the present invention is to reduce the amount of waste liquid by effectively utilizing the pickling liquid in the pickling tank and the water in the water washing tank, whose treatment capacity has been reduced by continuous processing.
[0002]
[Prior art]
A long wire wound with a coil, for example, a steel wire such as a steel cord, is heat-treated by heating a wire fed from unwinding in a furnace. Scale generated. Therefore, in order to remove the scale, the steel wire is immersed in a pickling treatment tank to perform the pickling treatment, and the steel wire subjected to the scale removal is subjected to a post-treatment such as a surface coating treatment such as plating. .
[0003]
Here, in the case of a pickling tank, for example, in the case of a pickling tank using a hydrochloric acid solution as a pickling liquid, the temperature of the hydrochloric acid solution is usually 80 ° C. or lower, but the temperature of the steel wire immediately after leaving the heat treatment furnace is Normally, the temperature is 500 ° C or higher. If this steel wire is introduced into the pickling bath at that temperature, various problems such as evaporation of the hydrochloric acid solution will occur. In general, a cooling treatment tank is provided between the heat treatment furnace and the pickling treatment tank for cooling before the cooling. Since the hydrochloric acid solution is attached to the surface of the pickled steel wire, the picked wire is subjected to a water washing process to remove the hydrochloric acid solution, and thereafter, the steel wire is post-processed.
[0004]
As described above, the scale removal of the steel wire is generally performed by a removing device including three processing tanks of a cooling processing tank, an acid cleaning processing tank, and a water washing processing tank.
As conditions for properly performing the pickling treatment, it is necessary to appropriately control the hydrochloric acid concentration, the liquid temperature, the Fe ion concentration, and the like in the pickling treatment tank. Then, the hydrochloric acid concentration tends to decrease and the Fe ion concentration tends to increase, so that the pickling treatment liquid is renewed so that these concentrations are always within an appropriate range. . The renewal of the pickling treatment liquid is often carried out by a method of replacing the whole at a predetermined processing time, a method of partially replacing the solution, or a method of continuously updating only a part of the solution. This renewed hydrochloric acid solution is treated as waste liquid. In addition, the water in the washing tank needs to be renewed in order to maintain the cleaning effect, and the renewed water is also treated as waste liquid.
[0005]
Since these waste liquids are expensive to treat, it is necessary to reduce the amount thereof. Furthermore, in recent years, reduction of the amount of waste liquid has been required also from the viewpoint of global environmental protection.
[0006]
[Problems to be solved by the invention]
Therefore, an object of the present invention is to reduce the amount of waste liquid by effectively utilizing the pickling solution in the pickling tank and the water in the water washing tank, which has reduced the processing capacity due to the continuous processing, and can reduce the amount of waste liquid. And a method of removing scale generated by the method.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the descaling apparatus of the present invention further comprises at least one cooling treatment tank for cooling a heat-treated long wire, further reducing the temperature of the wire cooled in the cooling treatment tank, and An intermediate treatment tank for removing the primary scale on the surface, a pickling treatment tank for removing the secondary scale on the surface of the wire, and a water washing treatment tank for removing the pickling liquid attached to the surface of the wire are provided. A water supply means for introducing water in the water washing treatment tank and a pickling liquid supply means for introducing a pickling liquid in the acid treatment tank are provided.
[0008]
When it is necessary to control the temperature of the wire immediately before entering the pickling tank, it is preferable to provide a means for cooling the wire to a predetermined temperature in at least one of the cooling tanks. The cooling means is preferably performed by controlling the flow rate of cooling water.
In addition, if it is necessary to more precisely control the wire temperature immediately before entering the pickling tank, a liquid temperature sensor is installed in the intermediate processing tank, and the liquid temperature sensor changes the liquid temperature of the intermediate processing tank. It is preferable that the liquid temperature of the intermediate processing tank is maintained at a predetermined temperature by operating the cooling means according to the fluctuation of the liquid temperature.
[0009]
The scale removing method of the present invention comprises the steps of cooling a long wire that has been heat-treated in a cooling treatment tank, and further reducing the temperature of the cooled wire in the intermediate treatment tank and removing primary scale on the surface of the wire. And a step of removing the secondary scale on the surface of the wire in the pickling tank and a step of removing the pickling liquid adhering to the surface of the wire in the water-washing tank. Is supplied by a water supply means for introducing water in the water washing treatment tank and a pickling liquid supply means for introducing a pickling liquid in the acid washing treatment tank.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
1 and 2 are conceptual diagrams of a typical scale removing apparatus according to the present invention, wherein 1 and 2 are cooling treatment tanks, 3 is an intermediate treatment tank, 4 is an pickling treatment tank, and 5 is a water washing treatment tank. is there. Further, 6 is a water supply means, 7 is a pickling liquid supply means, 8 is a scrubber provided on the intermediate treatment tank and the pickling treatment tank, and 9 is a hood. H is a heat treatment furnace, and W is a wire.
[0011]
The scale removing apparatus shown in FIG. 1 cools a long wire material heat-treated at a temperature of 850 ° C. or more, specifically, a wire material W made up of 30 to 60 steel wires having a wire diameter of 3.0 mm. At least one cooling treatment tanks 1 and 2; an intermediate treatment tank 3 for further lowering the temperature of the wire W cooled in these cooling treatment tanks 1 and 2 and removing the primary scale of the wire surface; And a water washing tank 5 for removing the pickling liquid adhering to the surface of the wire rod.
[0012]
Although the number of cooling treatment tanks is two in FIG. 1, it may be one as shown in FIG. 2, and the number of cooling treatment tanks can be increased or decreased as needed. Specifically, the larger the difference between the temperature of the wire W discharged from the heat treatment furnace H and the desired temperature of the wire W immediately before entering the pickling treatment tank 4, the more the number of cooling treatment tanks is increased. It is desirable to cool gradually gradually.
[0013]
By providing a means for cooling the wire W to a predetermined temperature in at least one of the cooling baths 1 and 2, the wire temperature immediately before entering the pickling bath 4 can be controlled. Specifically, as the cooling means, a method of precisely controlling the temperature by finely changing the flow rate of the cooling water, or a method of roughly controlling the temperature by opening and closing a valve of the cooling water can be considered. In order to accurately maintain the bath temperature of the pickling tank 4 at a predetermined temperature, it is more preferable to perform the former method.
[0014]
In particular, the temperature of the wire W entering the cooling treatment tank is usually 500 to 550 ° C, and the temperature entering the intermediate treatment tank 3 is preferably set to 150 to 250 ° C. Although it is necessary to cool the wire rod up to this point, as shown in FIG. 2, when cooling is performed in only one cooling treatment tank 1, as shown in FIG. , 2 must be cooled rapidly compared to the case of cooling by both of them, and the temperature will vary considerably. In this case, the cooling means is precisely changed by finely changing the flow rate of the cooling water. It is more preferable to adopt a method of performing temperature control in advance.
[0015]
When two or more cooling baths 1 and 2 are provided, the temperature of the wire is cooled to 250 to 350 ° C. in the cooling bath 1, and the temperature of the wire is lowered to 150 to 250 ° C. in the cooling bath 2. The cooling means of the cooling treatment tanks 1 and 2 may be controlled in a precise manner by finely changing the flow rate of the cooling water. Any method may be used.
[0016]
The intermediate treatment tank 3 is provided for effectively using the hydrochloric acid solution and water, which have been conventionally discarded as waste liquid, and the temperature of the wire W cooled in the cooling treatment tanks 1 and 2 is reduced by the intermediate treatment tank. The primary scale can be further reduced, and the primary scale of the wire surface can be removed by immersion in a hydrochloric acid solution having a lower concentration but a lower concentration than the hydrochloric acid solution in the pickling tank. Before starting the first treatment, the treatment liquid in the intermediate treatment tank 3 supplies the hydrochloric acid solution and the washing water to the pickling treatment tank and the water washing treatment tank in advance, and flows out of the pickling treatment tank and the water washing treatment tank. Preferably, the solution is filled by flowing the required amount into the intermediate treatment tank.
[0017]
In the pickling tank 4, a hydrochloric acid solution is used as a pickling solution, and a hydrochloric acid solution having a hydrochloric acid concentration of 160 to 170 g / l is continuously replenished in an amount of 120 to 150 l / h so that the hydrochloric acid concentration in the hydrochloric acid solution is constantly maintained. It is maintained in the range of 130 to 150 g / l, so that secondary scale on the steel surface can be properly removed.
[0018]
The primary scale removed in the intermediate treatment tank 3 and the secondary scale removed in the pickling treatment tank 4 are merely distinguished for convenience only, and do not mean different scales in particular. That is, it only means that a part of the scale formed on the steel material surface is removed by the intermediate treatment tank, and the remaining scale is completely removed by the pickling treatment tank.
[0019]
The intermediate treatment tank 3 is provided with a water supply means 6 for introducing water in the water treatment tank 5 and a pickling liquid supply means 7 for introducing a pickling liquid in the acid treatment tank 4.
The water supply means 6 includes, specifically, a pipe connecting the intermediate processing tank 3 and the washing processing tank 5 and a valve attached to a pipe connection point of each processing tank. Here, the height of the pipe attached to the rinsing tank is set higher than the height of the pipe attached to the intermediate tank 3, and the solution discharged from the rinsing tank 5 to the intermediate tank 3 using the height difference. Is preferably supplied. When stopping the processing, first, the valve attached to each processing tank is closed, and then the circulation of each processing tank is stopped. That is, since the liquid level during the circulation changes when the circulation is stopped, if the circulation is stopped with the valve opened, unnecessary liquid is prevented from flowing into the intermediate treatment tank from the washing tank. That's why.
The pickling liquid supply means 7, like the washing liquid supply means 6, includes a pipe connecting the intermediate processing tank 3 and the pickling processing tank 4, and a valve attached to a pipe connection point of each processing tank.
[0020]
In addition, a liquid temperature sensor is provided in the intermediate processing tank 3, the liquid temperature sensor detects a change in the liquid temperature of the intermediate processing tank 3, and operates the cooling means in accordance with the change in the liquid temperature, and By maintaining the liquid temperature of the treatment tank 3 at a predetermined temperature, the temperature of the wire rod immediately before entering the pickling treatment tank 4 can be controlled more precisely.
[0021]
【Example】
Next, using the scale removing apparatus (the apparatus shown in FIGS. 1 and 2) according to the present invention, the scale generated on the surface of the long steel wire is continuously removed under the above-described conditions, and the scale is removed for 24 hours. The amount of waste liquid generated after the continuous treatment was measured. The measurement was performed for 3 days, and the fluctuation was also measured. Table 1 shows various conditions and the amount of waste liquid in each treatment tank. For reference, Table 1 also shows the data of the conventional example shown in FIG. 3 and the data of the comparative examples shown in FIGS. 4 and 5.
[0022]
[Table 1]

[0023]
From the results of the waste liquid amount shown in Table 1, in all of Examples 1 to 3, the waste liquid amount is significantly reduced as compared with the conventional example, and the pickling treatment can be performed simultaneously in the intermediate treatment tank. Since the scale removal amount in the washing tank can be reduced, the liquid temperature in the pickling tank can be lowered by about 5 to 10 ° C, and the amount of hydrochloric acid to be replenished (+ e in the figure) is only 20 to 30 l / h. Can be reduced.
Note that Comparative Example 1 in which the pickling solution in the pickling tank was not reused in the intermediate treatment tank and Comparative Example 2 in which the water in the water washing tank was not reused in the intermediate treatment tank were, on the contrary, compared with the conventional example in the amount of waste liquid. Sometimes increased.
Further, comparing the maximum values of the waste liquid amounts in Examples 1 to 3, the waste liquid amount in Example 1 in which two cooling treatment tanks were provided was the smallest, and then the flow rate was precisely adjusted with one cooling treatment tank. Examples 2 and 3 were less.
[0024]
【The invention's effect】
According to the present invention, the amount of waste liquid can be significantly reduced by effectively utilizing the pickling solution in the pickling tank and the water in the water-washing tank, whose processing capacity has been reduced by continuous processing.
Further, at least one of the cooling tanks is provided with a means for cooling the wire to a predetermined temperature, preferably a cooling means for controlling the flow rate of the cooling water, thereby controlling the temperature of the wire immediately before entering the pickling tank. can do.
In addition, a liquid temperature sensor is provided in the intermediate processing tank, and the liquid temperature sensor detects a change in the liquid temperature of the intermediate processing tank, and operates the cooling means in accordance with the change in the liquid temperature, thereby providing an intermediate processing tank. By keeping the liquid temperature at a predetermined temperature, the temperature of the wire rod immediately before entering the pickling tank can be controlled more precisely.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of a typical scale removing device according to the present invention.
FIG. 2 is a conceptual diagram of another scale removing device according to the present invention.
FIG. 3 is a conceptual diagram of a conventional scale removing device.
FIG. 4 is a conceptual diagram of a scale removing device of Comparative Example 2.
FIG. 5 is a conceptual diagram of a scale removing device of Comparative Example 1.
[Explanation of symbols]
1,2 Cooling tank
3 Intermediate processing tank
4 Pickling tank
5 Rinse tank
6 Water supply means
7 Pickling solution supply means
8 Scrubber
9 Food
H heat treatment furnace
W wire rod

Claims (5)

At least one cooling bath for cooling the heat-treated long wire;
An intermediate treatment tank that further lowers the temperature of the wire cooled in the cooling treatment tank, and removes primary scale on the surface of the wire,
A pickling tank for removing secondary scale on the surface of the wire,
A washing tank for removing the pickling liquid attached to the surface of the wire rod,
The intermediate treatment tank is provided with a water supply means for introducing water from the water treatment tank and a pickling liquid supply means for introducing a pickling liquid in the acid treatment tank. apparatus. The scale removing apparatus according to claim 1, wherein at least one of the cooling tanks is provided with a unit for cooling the wire to a predetermined temperature. 3. The scale removing device according to claim 2, wherein the cooling unit controls the flow rate of the cooling water. Provide a liquid temperature sensor in the intermediate processing tank,
The liquid temperature sensor senses a change in the liquid temperature of the intermediate processing tank, and operates the cooling means according to the change in the liquid temperature to maintain the liquid temperature of the intermediate processing tank at a predetermined temperature. Item 4. The scale removing device according to Item 2 or 3. A method for removing scale generated on the surface of a wire using the removal device according to any one of claims 1 to 4,
A step of cooling the heat-treated long wire rod in a cooling bath,
In the intermediate treatment tank, while further lowering the temperature of the cooled wire, removing the primary scale of the wire surface,
A step of removing secondary scale on the surface of the wire in an acid pickling tank;
A process of removing the pickling liquid adhering to the surface of the wire in the washing bath,
The liquid amount of the intermediate treatment tank reduced by the continuous treatment is replenished by a water supply means for introducing water in the water treatment tank and a pickling liquid supply means for introducing a pickling liquid in the acid treatment tank. To remove the scale generated on the surface of the wire.

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