JP2008106344A - Method for manufacturing substrate for lead storage battery and manufacturing apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a substrate for a lead storage battery which inhibits the formation of dross in a melting/holding furnace for lead, and to provide a manufacturing apparatus therefor. <P>SOLUTION: The method for manufacturing the substrate 12 for the lead storage battery through the steps of casting molten lead or a lead alloy 5 which have been melted in the melting/holding furnace 1 into a grid substrate 12 by using a substrate-casting machine 2 includes the steps of: continuously melting a substrate-cut scrap 3 produced in the substrate-casting machine 2 while reducing the oxide of the surface; and returning the molten lead or the lead alloy to the melting/holding furnace 1. In an apparatus for manufacturing the substrate 12 for the lead storage battery, which has the melting/holding furnace 1 for lead or the lead alloy and a substrate-casting machine 2 as a main part, the apparatus for manufacturing the substrate 12 further has a continuous reductive melting furnace 4 for reducing and melting the oxide on the surface of a substrate-cut scrap 3 produced in the substrate-casting machine 2 and returning the molten lead or the lead alloy to the melting/holding furnace 1. The formation of the dross can be more adequately prevented by using a molten-lead recovery container or a lead scrap delivery machine. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a lead-acid battery substrate with reduced dross generation in a lead or lead alloy melting and holding furnace and a manufacturing apparatus therefor.

  In the casting of a lead-acid battery grid substrate using two molds (book mold casting), as shown in FIG. 3, the runner portion 21 for positioning the molten metal into the as-cast grid substrate and positioning, etc. The runner 21 and the bottom 22 are cut off immediately after casting and returned to the melting and holding furnace as substrate cutting scraps (hereinafter referred to as cutting scraps as appropriate) for remelting. Then, it is cast again on the lattice substrate.

  In addition, if a defective substrate such as a break (due to lack of hot water), void breakage, or burnt breakage occurs, it is also re-dissolved. Hereinafter, the cut scrap and the defective substrate are collectively referred to as lead scrap.

In this way, a large amount of dross is generated and floats on the molten metal surface of the melting and holding furnace while repeating the remelting of the lead scrap. The dross is a hindrance to the melting operation and also causes foreign matters to be mixed into the product. Therefore, the dross is periodically removed and discarded as industrial waste.
However, since this dross contains a high concentration of 80 to 90 mass% metallic lead, the disposal of this dross increases the cost of the product, and there are problems in terms of effective use of resources and environmental conservation. It was.
For these reasons, various proposals (for example, Patent Document 1) have been proposed to reduce dross, but a sufficient effect has not yet been obtained.

JP-A-9-73924

In view of this situation, the present inventors conducted various experiments for the purpose of investigating the cause of dross generation and reducing it. As a result, we found that dross is generated due to oxides (films) on the surface of lead scrap, and that the amount of dross is reduced by melting the lead scrap in a reducing atmosphere and then returning it to the melting and holding furnace. The present invention was completed through further experiments.
An object of this invention is to provide the manufacturing method of the board | substrate for lead acid batteries which reduced generation | occurrence | production of the dross in the melt | dissolution holding furnace of lead or a lead alloy, and its manufacturing apparatus.

  The invention according to claim 1 is a method for manufacturing a lead-acid battery substrate in which a molten lead or lead alloy melted in a melting and holding furnace is cast on a lattice substrate by a substrate casting machine. A method for producing a lead-acid battery substrate, wherein the oxide is continuously melted while being reduced and returned to the melting and holding furnace.

  According to a second aspect of the present invention, there is provided a lead-acid battery substrate manufacturing apparatus mainly composed of a lead or lead alloy melting and holding furnace and a substrate casting machine, wherein lead scraps generated in the substrate casting machine are reduced with oxides on the surface thereof. An apparatus for producing a lead-acid battery substrate, comprising a continuous reduction melting furnace for continuously melting and returning to the melting holding furnace.

  The invention according to claim 3 is characterized in that the continuous reduction melting furnace has a cylindrical shape with a circular cross section or a rectangular cross section, and the inside is filled with a high temperature reducing gas combustion flame. It is a manufacturing apparatus of the board | substrate for lead acid batteries as described in 1 ..

  According to a fourth aspect of the present invention, the continuous reduction melting furnace is provided with a lead scrap inlet and a molten metal outlet, and a floor surface on which the molten lead scrap flows from the lead scrap inlet to the molten metal outlet. The lead-acid battery substrate manufacturing apparatus according to claim 2 or 3, wherein the apparatus has a downward slope.

  The invention according to claim 5 is a lead-acid battery according to any one of claims 2 to 4, wherein a slat for holding lead scraps is provided above the floor surface of the continuous reduction melting furnace. This is a substrate manufacturing apparatus.

  According to a sixth aspect of the present invention, there is provided a molten lead recovery container opened at both ends for recovering molten lead discharged from the molten metal outlet of the continuous reduction melting furnace, below the molten metal outlet and on the molten metal surface of the melting holding furnace. It is provided, It is a manufacturing apparatus of the board | substrate for lead acid batteries in any one of the Claims 2 thru | or 5 characterized by the above-mentioned.

7. The lead storage battery substrate according to claim 6, wherein the protruding distance H of the molten lead recovery container from the melting and holding furnace surface satisfies the following expressions (1) and (2): It is a manufacturing apparatus.
H ≧ 20mm (1)
H ≧ h (h: distance between the lower end of the molten metal outlet of the continuous reduction melting furnace and the hot water surface in the melting and holding furnace) (2)

  The invention according to claim 8 is characterized in that the ratio (D / d) of the inner diameter D of the molten lead recovery vessel and the inner diameter d of the molten metal outlet of the continuous reduction melting furnace is 1.5-3. Or it is a manufacturing apparatus of the board | substrate for lead acid batteries of 7.

  A ninth aspect of the present invention is the apparatus for manufacturing a lead-acid battery substrate according to any one of the sixth to eighth aspects, wherein the molten lead recovery container is divided so as to be openable and closable in the lateral direction.

  A tenth aspect of the present invention is the apparatus for manufacturing a lead-acid battery substrate according to any one of the second to ninth aspects, wherein a lead scrap feeder is provided above the continuous reduction melting furnace.

  The invention according to claim 1 is a lead storage battery substrate in which lead scraps of a lattice substrate generated by a casting machine for a lead storage battery lattice substrate such as a book mold are returned to a melting and holding furnace by reducing oxides on the surface and dissolving them. In the manufacturing method, since the lead scrap is reduced, the amount of dross generated in the melting and holding furnace is reduced. Therefore, the cost increase of the product can be suppressed, and effective use of resources and environmental conservation can be achieved.

  The invention according to claim 2 is an apparatus for producing a lead-acid battery substrate comprising a continuous reduction melting furnace that reduces and melts oxides on the surface of lead scrap generated in a substrate casting machine and returns them to the melting and holding furnace. The lead scrap is reduced by the continuous reduction melting furnace, and the oxide on the surface thereof is melted and returned to the melting holding furnace, so that the dross amount of the melting holding furnace is reduced.

  According to a third aspect of the present invention, there is provided a lead storage battery in which the inside of the continuous reduction melting furnace has a circular or rectangular cross section and is filled with a high temperature reducing gas combustion flame (hereinafter abbreviated as a reducing flame). Since this is an apparatus for manufacturing a substrate, the oxide on the surface of lead scrap is efficiently and rapidly reduced and melted, and returned to the melting and holding furnace.

  Since the floor surface in which the molten lead scrap of the continuous reduction melting furnace flows downward from the cutting scrap input port to the molten metal outlet, the lead scrap melt is the continuous scrap. It moves quickly in the reduction melting furnace toward the molten metal outlet and is excellent in workability and productivity.

  According to the fifth aspect of the present invention, the slats are provided above the floor surface of the continuous reduction melting furnace. When the lead scraps are held on the slats, the lead scrap melts as droplets and quickly drops from the slats. And separating from the unmelted portion of the lead scrap. As a result, a reducing flame directly shines on the unmelted portion, and lead scrap is efficiently reduced and dissolved.

  A sixth aspect of the present invention is the apparatus for producing a lead-acid battery substrate according to any one of the second to fifth aspects, wherein the molten metal outlet of the continuous reduction melting furnace is below the lead alloy molten metal surface of the melting holding furnace. A molten lead recovery container open at both ends is provided, and the molten lead falling from the molten metal outlet of the continuous reduction melting furnace falls into the molten lead recovery container, and the molten lead recovery container is the continuous reduction Since the non-oxidizing gas discharged from the melting furnace is filled, the molten lead falling from the molten metal outlet is prevented from being oxidized and drossed.

In this invention, when the protrusion distance H of the molten lead recovery container from the melting and holding furnace surface satisfies the following expressions (1) and (2), the atmosphere in the molten lead recovery container is more non-oxidizing. The molten lead discharged from the continuous reduction melting furnace in an atmosphere is stably prevented from being oxidized and drossed.
H ≧ 20mm (1)
H ≧ h (h: distance between the lower end of the molten metal outlet of the continuous reduction melting furnace and the hot water surface in the melting and holding furnace) (2)

  By setting the ratio (D / d) of the inner diameter D of the molten lead recovery container to the inner diameter d of the molten metal outlet of the continuous reduction melting furnace to be 1.5 to 3, the atmosphere in the molten lead recovery container is more non-oxidized. Thus, oxidation and dross formation of molten lead discharged from the continuous reduction melting furnace can be prevented more stably.

  By making the molten lead recovery container openable and closable in the lateral direction, dross in the molten lead recovery container can be scraped out easily, and mixing of dross into the substrate can be prevented.

  The invention according to claim 10 is a lead-acid battery substrate manufacturing apparatus provided with a lead scrap feeder above the continuous reduction melting furnace, and the lead scrap is temporarily stored in the lead scrap feeder, so that lead such as a defective substrate Even when scraps are continuously generated, lead scraps do not overflow from the continuous reduction melting furnace and directly fall into the melting and holding furnace, and dross generation can be prevented more reliably. In addition, according to the present invention, an operation such as sorting the defective substrates and subsequently putting them into the continuous reduction melting furnace becomes unnecessary, so that an unmanned operation is possible.

  In the present invention, when lead waste generated after casting of a lead-acid battery substrate is returned to the melting and holding furnace, the oxide (film) on the surface of the lead scrap is continuously dissolved while being reduced and returned to the melting and holding furnace. A storage battery substrate manufacturing method and a manufacturing apparatus therefor, which can reduce the amount of dross generated in a melting and holding furnace.

In the present invention, any method can be applied as a method for reducing and dissolving lead scrap, but a method of radiating a reducing flame to lead scrap is simple and excellent in productivity and recommended.
As the reducing flame, for example, one in which the CO concentration in the gas combustion flame is controlled to 0.5 to 5 mass% by controlling the air-fuel ratio of gas such as methane gas, ethane gas, propane gas, butane gas, and city gas can be applied. .

The lead storage battery substrate manufacturing apparatus of the present invention reduces the oxides on the surface of the lead scrap 3 generated in the lead or lead alloy melting and holding furnace 1, the substrate casting machine 2, and the substrate casting machine 2, as shown in FIG. A continuous reduction melting furnace 4 for melting and returning to the melting holding furnace 1 is a main part.
In FIG. 1, 5 is a molten lead alloy, 6 is a conveyor, 11 is a molten metal transfer pipe, and 12 is a lattice substrate. In the continuous reduction melting furnace 4, oxides mixed inside the lead scrap 3 are also reduced.

  As shown in FIG. 2, the continuous reduction melting furnace 4 has a cylindrical shape with a circular cross section, a lead scrap inlet 4 a at one end of the cylindrical body, a molten metal outlet 4 b at the other end, and lead scrap 3 inside. Is provided, and a burner 8 is provided at the lead scrap inlet 4a, and a high-temperature reducing flame 9 is emitted from the burner 8. The outer periphery of the continuous reduction melting furnace 4 is formed of a heat insulating material 10. In FIG. 2, the molten metal transfer pipe is not shown.

  The molten lead alloy 5 in the melting and holding furnace 1 is introduced into the substrate casting machine 2 through the molten metal transfer pipe 11, and the lattice substrate 12 is continuously die-cast. The grid substrate 12 is immediately cut away from unnecessary portions (cutting scrap 3: runner 21 and bottom 22, see FIG. 3) and transferred to the next electrode plate process. The cut waste 3 is transferred to the cut waste inlet 4a of the continuous reduction melting furnace 4 by the belt conveyor 6 and dropped from there onto the slats 7 in the continuous reduction melting furnace 4.

The cutting waste 3 on the slat 7 begins to melt as the surface oxide is reduced in a short time by the high-temperature reducing gas combustion flame 9. The molten material becomes droplets 3 a and falls from the top of the slat 7 onto the floor surface 4 c and is separated from the unmelted portion of the cutting waste 3. As a result, the reducing flame 9 is directly applied to the unmelted portion of the cutting waste 3 and the cutting waste 3 is efficiently dissolved. The droplets 3 a gather and flow on the floor surface 4 c to reach the molten metal outlet 4 b and flow into the melting and holding furnace 1 from there.
If a defective substrate such as a break is generated, it is treated in the same manner as the cutting waste 3.

In the present invention, the structure of the continuous reduction melting furnace is arbitrary. For example, the inside of the cylinder having a rectangular cross section and the corner of which is a downside (floor surface) can be used.
By setting the inclination angle α of the floor surface 4c to 20 ° or more, it is desirable that the melt quickly flows. The number and installation location of the burners 8 are appropriately determined according to the amount and size of lead scrap.

  A relatively coarse wire mesh, a porous material, etc. can be applied to the slats. An appropriate inclination angle β of the slats is 20 ° to 45 ° where the cutting scraps smoothly slide on the slats. If the angle exceeds 45 °, cutting scraps or the like may fall on the slats and fall into the melting and holding furnace without being fully reduced.

The lattice substrate shown in FIG. 3 was manufactured using the manufacturing apparatus of the present invention shown in FIGS.
About 2 tons of lead calcium alloy was melted in the melting and holding furnace 1, and the molten metal temperature was kept at about 500 ° C. The dross on the molten metal surface was completely removed before casting was started.

  The inside of the continuous reduction melting furnace 4 was maintained at about 800 ° C. by a reducing flame 9 of butane gas radiated from a burner 8. The reducing flame 9 was discharged from the molten metal outlet 4 b toward the molten metal surface of the melting and holding furnace 1 so as to cover the molten metal surface of the melting and holding furnace 1. The CO gas concentration in the reducing flame 9 was automatically controlled to 2 to 3% by adjusting the air-fuel ratio of the burner 8.

  The continuous reduction melting furnace 4 has a cylindrical shape with a circular cross-section (inner diameter: 150 mm), a distance from the lead scrap inlet 4a to the molten metal outlet 4b is 1000 mm, a floor inclination angle α is 30 °, and a snowboard inclination angle β. With 25 °.

  The lead alloy molten metal 5 in the melting and holding furnace 1 is sent to the casting machine 2 through a molten metal transfer pipe 11 by a pump (not shown), and the lattice substrate 12 is cast by a book mold casting machine comprising two molds. . After casting, the grid substrate 12 was immediately cut off unnecessary parts and transferred to the next electrode plate process. The removed unnecessary part (cutting waste 3) was transferred to the cutting waste input port 4a of the continuous reduction melting furnace 4 by the belt conveyor 6 and dropped onto the slats 7 in the continuous reduction melting furnace 4 from there. Here, only excision waste 3 was redissolved.

  The cutting waste 3 is reduced in the surface layer by the high-temperature reducing flame 9 radiated from the burner 8 on the slat 6 and the surface layer is melted. It moved to the molten metal outlet direction. During this time, the melted portion of the cutting waste 3 became droplets, dropped from the gap between the slats 6 to the floor surface 4c, flowed along the inclination of the floor surface 4c, and flowed into the melting and holding furnace 1 from the molten metal outlet 4b.

The lattice substrate 12 was cast at a rate of 17 sheets per minute for 5 hours. The amount of molten metal 5 in the melting and holding furnace 1 was kept substantially constant (about 2 tons) by appropriately introducing lead calcium alloy ingots. Excision waste 3 generated 100 kg per hour. Dross deposited on the surface of the melting and holding furnace 1 was periodically collected.
After the completion of casting, all recovered dross was weighed. The total dross amount was divided by the amount of cutting waste (500 kg) returned to the melting and holding furnace to determine the dross generation rate.

[Comparative Example 1]
The grid substrate 12 was cast by the same method as in Example 1 except that the cutting waste 3 was directly returned to the melting and holding furnace 1 without passing through the continuous reduction melting furnace 4, and all recovered dross was measured. The dross incidence was determined.

  The results of Example 1 and Comparative Example 1 are shown in Table 1.

  As is clear from Table 1, in the example of the present invention (Example 1), the dross generation rate was 1%, which was significantly reduced compared to 4% in Comparative Example 1. This is because, in Example 1, the continuous reduction melting furnace was used to reduce and melt the oxide on the surface of the cutting waste, and then returned to the melting holding furnace.

  During long-term operation, the amount of flue gas discharged from the continuous reduction melting furnace fluctuates due to the increase or decrease of the raw material charged into the continuous reduction melting furnace or the change of the air flow over the melting and holding furnace surface. As a result, molten lead falling from the outlet of the continuous reduction melting furnace may be reoxidized and drossed. The invention according to claim 6 is a molten lead recovery container for stably maintaining a non-oxidizing atmosphere below the outlet of the continuous reduction melting furnace and preventing reoxidation and drossing of molten lead falling from the continuous reduction melting furnace. About.

  The molten lead recovery container 31 of the present invention is, for example, a container having a circular cross section open at both ends as shown in FIG. Moreover, the lower part is immersed in the molten lead alloy 5 in the melting and holding furnace 1, and the center part and the upper part protrude on the lead alloy molten metal surface 5a. Since the molten lead recovery container 31 is filled with non-oxidizing combustion exhaust gas discharged from the molten metal outlet 4b of the continuous reduction melting furnace 4, the lead alloy molten metal 5b falling from the molten metal outlet 4b of the continuous reduction melting furnace 4 is Oxidation and drossing are prevented. The cross-sectional shape of the molten lead recovery container 31 is not limited to a circular shape, and may be any polygonal shape. In FIG. 4A, 32 is a member for attaching the molten lead recovery container 31 to the melting and holding furnace 1.

  As shown in FIG. 4 (b), the molten lead recovery container 31 has a protruding distance H from the lead alloy molten metal surface 5 a in the melting and holding furnace 1 of 20 mm or more, and a molten metal outlet 4 b of the continuous reduction melting furnace 4. Non-oxidizing combustion exhaust gas discharged from the continuous reduction melting furnace 4 into the molten lead recovery vessel 31 by making it equal to or longer than the distance h from the lowermost end portion of the lead and the lead alloy molten metal surface 5a of the melting and holding furnace 1 Will fill more efficiently.

  In the present invention, the ratio (D / d) of the inner diameter D of the molten lead recovery container 31 and the outer diameter d of the molten lead outlet opening of the continuous reduction melting furnace is such that non-oxidizing combustion exhaust gas is introduced into the molten lead recovery container 31. In order to fill it up, it is better to be small, but if it is too small (close to 1), it is difficult to provide the molten lead recovery container 31 at a predetermined position. On the other hand, if the ratio (D / d) is too large, the diffusion area of the non-oxidizing combustion exhaust gas increases and it becomes difficult to maintain the inside of the molten lead recovery container 31 in a non-oxidizing atmosphere. Therefore, the ratio (D / d) is preferably 1.5 to 3.

  In the present invention, as shown in FIG. 5, the molten lead recovery container is desirably openable and closable in the lateral direction so that the dross in the molten lead recovery container 33 can be easily scraped to the outside. When dross accumulates in the molten lead recovery vessel 33, the dross is mixed with the falling molten lead and is rolled into the molten lead alloy 5 in the melting and holding furnace 1 and adversely affects the quality of the cast substrate. In 33, it is desirable to keep the hot water surface clean. In FIG. 5, 33a is an opening / closing part, and 33b is a hinge.

  Using the manufacturing apparatus provided with the molten lead recovery container 31 of the present invention shown in FIGS. 4 (a) and 4 (b), a continuous dissolution experiment was conducted for 5 hours to examine the amount of dross generated. As in Example 1, 100 kg of cutting waste was generated per hour, so that the cutting waste redissolved in the continuous reduction melting furnace was 500 kg. The dross on the molten lead surface 5a of the melting and holding furnace 1 was completely removed before the start of the experiment.

  The inner diameter of the melting and holding furnace 1 is 800 mm, and the outlet 4b of the continuous reduction melting furnace 2 is formed of an iron cylinder (thickness 1 mm) having an inner diameter of 150 mm, and the distance h between the lower end thereof and the lead alloy molten metal surface 5a of the melting and holding furnace 1 is Set to 20 mm. The molten lead recovery container 31 was made of iron (thickness 1 mm), and its inner diameter was variously changed in the range of 100 to 600 mm. Moreover, the protrusion distance H from the lead alloy molten metal surface 5a of the melting and holding furnace 1 was variously changed within a range of 10 to 50 mm.

(Comparative Example 2)
Except that the molten lead recovery container was not provided, the excised waste was redissolved by the same method as in Example 1 and the amount of dross generated was examined.
The investigation results of Example 2 and Comparative Example 2 are shown in Table 2.

  As is apparent from Table 2, in Example 2 (example of the present invention) using the molten lead recovery container, the dross amount is as small as 3.00 to 4.75 kg, and 5 of Comparative Example 1 in which the molten lead recovery container is not used. The dross amount was reduced by 7 to 42% compared to .13 kg.

  Compared to the distance h (= 20 mm) between the molten metal outlet and the lead alloy molten metal surface, the protruding distance H of the molten lead recovery container is 10 mm (No. 5), which is equal to or more than 20 mm (No. 4). If the length is increased, the amount of dross decreases rapidly. Therefore, it is desirable that H is equal to or greater than h. Also, if the protruding distance H is short, the molten lead falling from the continuous reduction melting furnace may cause the molten metal surface in the molten lead recovery container to swing and the dross to jump out of the recovery container and enter the casting substrate. The protruding distance H of the lead recovery container is desirably 20 mm or more.

  No. No. 9 had a large D of 600 mm, so the diffusion area of the combustion exhaust gas was widened, the molten lead recovery vessel could not be maintained in a sufficient reducing atmosphere, and the amount of dross was slightly larger. No. 8 (D / d = 3.0), the dross amount was remarkably reduced. At 6 (D / d = 1.2), the dross amount was minimized. Thus, the dross amount decreases as the ratio of (D / d) decreases. However, when (D / d) approaches 1, the gap between the molten lead outlet and the molten lead recovery container becomes narrow, making it difficult to provide a molten lead recovery container. Accordingly, the ratio of (D / d) is desirably in the range of 1.5 to 3.0. In Example 1, the protrusion distance H of the molten lead recovery container is set to 50 mm at the maximum, but may be further increased if there is no problem in terms of space.

Using the openable / closable molten lead recovery container 33 shown in FIG.
During this time, the molten lead recovery container 33 was opened every 6 hours and the dross was scraped to clean the hot water surface 5a in the recovery container 33. As a result, dross was not caught in the molten lead alloy 5 in the melting and holding furnace 1 mixed with the falling molten lead, and a cast substrate with good quality was stably obtained. The dimensions and installation conditions of the molten lead recovery container 33 are the same as those in Example 2. Same as 6.

  During long-time operation, defective substrates are continuously generated, and lead scraps conveyed by the conveyor may overflow into the continuous reduction melting furnace and fall directly into the melting and holding furnace. A tenth aspect of the present invention is a lead-acid battery substrate manufacturing apparatus provided with a lead scrap feeder that can stably supply lead scrap to a continuous reduction melting furnace even when defective substrates are continuously generated.

As shown in FIG. 6, the lead scrap feeder 41 is disposed below the end of the belt conveyor 6 on the lead scrap dropping side and above the lead scrap inlet 4 a of the continuous reduction melting furnace 4.
As shown in FIGS. 6 and 7, the structure of the lead scrap delivery machine 41 is a screw shaft 48 including a hopper 43 provided with stirring blades 42 on the inner surface and a helical screw 47 arranged on the axis of the hopper 43. Is the main part. The inner diameter D ₁ (see FIG. 7) of the lead scrap input port 43a of the hopper 43 is preferably made sufficiently larger than the width of the belt conveyor 6 so that the cutting waste 3 falling from the belt conveyor 6 does not leak. If the upper end of the hopper 43 is expanded in a funnel shape, leakage of the cutting waste 3 and the like can be prevented more reliably.

As shown in FIGS. 8A and 8B, the stirring blade 42 on the inner surface of the hopper 43 is attached to be inclined at a predetermined angle (θ) with respect to the horizontal direction. The tip surface 42 a of the stirring blade 42 is formed in an arc shape centered on the axis of the hopper 43.
8A and 8B, the screw shaft 48 is not shown.
As shown in FIG. 7, the hopper 43 rotates at a low speed in the direction of the arrow through gears 46 a and 46 b by an electric motor 45 installed on the base 44. The screw shaft 48 is directly attached and fixed to the base 44.

  The lead scraps falling from the conveyor circulate in the hopper 43 while being stirred by the stirring blades 42 rotating with the shaft rotation of the hopper 43, and are pushed downward and discharged from the discharge port 43c (see FIG. 7). . The downward pushing force applied to the lead scrap is generated by friction between the lead scrap and the screw 47. The pushing force is controlled by adjusting the inclination angle θ of the stirring blade 42, the angle α of the screw 47, the pitch p, and the like.

  According to the lead scrap feeder 41, even if a large amount of lead scrap is conveyed, it is discharged after being stored in the hopper 43 once, so that the lead scrap does not overflow from the continuous reduction melting furnace. . Moreover, since the entangled lead scraps are unraveled by the rotation of the stirring blade 42, the lead scraps are not clogged in the gap between the screw 47 and the lead scrap discharge port 43c. Furthermore, since the lead scrap is cut by the stirring blade 42 and the screw 47 and becomes finer, the dissolution rate in the continuous reduction melting furnace is improved.

The storage function of the lead scrap feeder according to the present invention shown in FIGS. 7, 8 (A) and 8 (B) was examined by experiment.
The inner diameter _{D 1} of the Namarikuzu inlet 43a of the hopper 43 is 400 mm, the inner diameter _{D 2} is 500mm in reservoir 43 b, the inner diameter _{D 3} of Namarikuzu outlet 43c is 150 mm, the total height H of the hopper 43 was 500mm. The inclination angle θ of the four stirring blades 42 on the inner surface of the hopper 43 was 45 ° with respect to the horizontal direction. The tip surface 42a of the stirring blade 42 was arc-shaped with R = 200 mm. Outer diameter _{D 4} of the screw 47 is 100 mm, the pitch P is set to 100 mm.

Lead scrap mixed with excavation scraps and defective substrate scraps conveyed by the belt conveyor 6 (see FIG. 6) is added to the lead scrap input port 43a of the hopper 43 that rotates 60 minutes per minute for 5 minutes per minute for 10 minutes. 50 kg was charged. The lead scrap was pushed downward while being unraveled by the rotating stirring blade 42 and discharged from the discharge port 43c.
Lead waste discharged from the discharge port 43c of the lead waste delivery machine 41 was measured in units of 1 minute.
The results are shown in FIG.

  As can be seen from FIG. 9, lead scrap was introduced for 10 minutes at a pace of 5 kg / min (diagram a) and discharged at a pace of 4 kg / min (diagram b). During this time, the amount of lead scrap stored in the hopper 43 (line c) continued to increase. The amount of storage in the hopper (line c) gradually decreases after the lead scrap is charged, and the amount of discharge (line b) gradually decreases along with it, and after 20 minutes, both the volume of storage and discharge become zero. It was. In FIG. 9, a line d is the cumulative amount of lead scrap introduced into the hopper.

Using the lead scrap delivery device of the present invention shown in FIGS. 7, 8 (b) and (b), the storage function of lead scrap when a large amount of lead scrap was introduced at a time was examined by experiment.
Inside the hopper, approximately 1.7 kg of excavated scrap per minute was continuously fed to simulate actual operation, and 10 defective substrate scraps (approximately 2 kg) were added 2 and 5 minutes after the start of loading, respectively. Then, after 10 minutes, 17 minutes, and 18 minutes, 20 defective substrate scraps (about 4 kg) were additionally charged. The amount of lead waste discharged from the lead waste delivery machine 41 was measured in units of 1 minute.
The results are shown in FIG.

  As is clear from FIG. 10, the discharge amount (diagram b) increases immediately after the additional input, but the degree of increase is substantially equal to the input amount (diagram a). This confirmed the storage function of the hopper.

  The lead storage battery substrate manufacturing apparatus (see FIG. 2) is provided with the lead scrap feeder according to the present invention shown in FIGS. 7, 8 (A) and (B) (see FIG. 6), and the lead storage battery substrate 12 Produced continuously over time. Into the hopper, approximately 1.7 kg of cut scraps per minute were continuously thrown into the hopper to simulate actual operation.

Lead scrap moves downward in the hopper 43 as the stirring blades 42 rotate, and is sent into the continuous reduction melting furnace 4 from the discharge port 43c to be melted. The molten lead becomes droplets of the melting and holding furnace 1. It dropped on the lead alloy molten metal surface 5a.
The discharge amount of lead scrap from the discharge port 43c increases immediately after the additional defective substrate is added, but the increase is small, and trouble such as lead scrap overflowing from the hopper 43 and dropping directly into the melting and holding furnace 1 Did not occur. This proves that the lead scrap feeder has a function of storing lead scrap and is useful for dross reduction. It was also confirmed that unmanned operation around the continuous reduction melting furnace could be realized.

  In the present invention, not only the lead scrap feeder shown in FIGS. 7, 8 (b) and (b), but any lead scrap feeder having a function of storing and discharging lead scrap can be applied. Further, the setting conditions (dimensions and rotation speed) of the hopper of the lead scrap feeder are not limited to the above-described embodiment, and can be appropriately selected according to the shape and amount of the lead scrap. Furthermore, in this invention, generation | occurrence | production of dross can be prevented more stably stably by using together a molten lead collection | recovery container and a lead waste sending machine.

It is plane explanatory drawing which shows embodiment of the manufacturing apparatus of the board | substrate for lead acid batteries of this invention. It is side explanatory drawing which shows embodiment of the continuous reduction melting furnace which comprises the manufacturing apparatus of the board | substrate for lead acid batteries of this invention. (A) is a front view which shows embodiment of the lattice board | substrate as cast, (b) is a front view which shows embodiment of the lattice board | substrate after cutting an unnecessary part. (A) is side explanatory drawing which shows embodiment of the manufacturing apparatus of the board | substrate for lead acid batteries of this invention which provided the molten lead collection | recovery container, (b) is side explanatory drawing of the said molten lead collection | recovery container. It is a plane explanatory view showing other embodiments of the molten lead recovery container. It is side explanatory drawing which shows embodiment of the manufacturing apparatus of the board | substrate for lead acid batteries of this invention which provided the lead waste sending machine. It is side surface explanatory drawing of the said lead waste sending machine. It is (I) plane explanatory drawing and (B) side explanatory drawing which show embodiment of the stirring blade part of a lead scrap sending machine. It is explanatory drawing which shows a time-dependent change, such as the storage amount of the lead scrap of a lead scrap sending machine. It is explanatory drawing which shows the time-dependent change of the input amount and discharge amount of the lead scrap of a lead scrap sending machine.

Explanation of symbols

1 Lead or lead alloy melting and holding furnace 2 Substrate casting machine 3 Cutting scrap 4 Continuous reduction melting furnace 4a Lead scrap charging port 4b Molten metal outlet 5 Lead alloy molten metal 5a Lead alloy molten metal surface 6 Belt conveyor 7 Snowboard 8 Burner 9 Reducing gas combustion flame (Reducing flame)
10 Heat Insulation Material 11 Molten Metal Transfer Pipe 12 Lattice Substrate (Lead Storage Battery Substrate)
21 runway (unnecessary part)
22 Hot water bottom (unnecessary part)
31 Molten lead recovery container 32 Member 33 for attaching the molten lead recovery container to the melting and holding furnace Molten lead recovery container 33a openable and closable in the lateral direction Opening and closing part 33b of the molten lead recovery container Hinge 41 of the molten lead recovery container Lead scrap delivery machine 42 Stirring vane 42a Stirring vane front end surface 43 Hopper 43a Hopper lead waste inlet 43b Hopper reservoir 43c Hopper lead waste outlet 44 Base 45 Electric motor (drive source)
46a, 46b Gear 47 Screw 48 Screw shaft

Claims (10)

  In a method for manufacturing a lead-acid battery substrate in which molten lead or lead alloy melted in a melting holding furnace is cast on a lattice substrate by a substrate casting machine, lead oxide generated in the substrate casting machine is reduced while reducing oxides on the surface thereof. A method for producing a substrate for a lead-acid battery, characterized by being continuously melted and returned to a melting and holding furnace.   In a lead or battery substrate manufacturing apparatus mainly composed of a lead or lead alloy melting and holding furnace and a substrate casting machine, lead scrap generated in the substrate casting machine is continuously dissolved while reducing oxides on the surface. An apparatus for producing a lead-acid battery substrate, comprising a continuous reduction melting furnace for returning to the melting and holding furnace.   The lead-acid battery substrate according to claim 2, wherein the continuous reduction melting furnace has a cylindrical shape with a circular cross-section or a rectangular cross-section, and the inside is filled with a high-temperature reducing gas combustion flame. apparatus.   The continuous reduction melting furnace is provided with a lead scrap inlet and a molten metal outlet, and the floor on which the molten lead scrap flows is downwardly inclined from the lead scrap inlet to the molten metal outlet. The manufacturing apparatus of the board | substrate for lead acid batteries of Claim 2 or 3 characterized by these.   The apparatus for producing a substrate for a lead storage battery according to any one of claims 2 to 4, wherein a slat for holding lead scraps is provided above the floor surface of the continuous reduction melting furnace.   A molten lead recovery container open at both ends for recovering molten lead discharged from the molten metal outlet of the continuous reduction melting furnace is provided below the molten metal outlet and on the molten metal surface of the melting holding furnace. The manufacturing apparatus of the board | substrate for lead acid batteries in any one of Claim 2 thru | or 5. The apparatus for producing a substrate for a lead storage battery according to claim 6, wherein a protruding distance H of the molten lead recovery container from the melting and holding furnace surface satisfies the following expressions (1) and (2).
H ≧ 20mm (1)
H ≧ h (h: distance between the lower end of the molten metal outlet of the continuous reduction melting furnace and the hot water surface in the melting and holding furnace) (2)   The lead acid battery according to claim 6 or 7, wherein a ratio (D / d) of an inner diameter D of the molten lead recovery container and an inner diameter d of a molten metal outlet of the continuous reduction melting furnace is 1.5 to 3. Board manufacturing equipment.   The lead-acid battery substrate manufacturing apparatus according to any one of claims 6 to 8, wherein the molten lead recovery container is divided to be openable and closable in a lateral direction.   The lead-acid battery substrate manufacturing apparatus according to any one of claims 2 to 9, wherein a lead scrap feeder is provided above the continuous reduction melting furnace.

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