JP2023067329A - Mold for mold conveyor and manufacturing method of massive slag using the same - Google Patents

Abstract

To provide a mold for a mold conveyor capable of suppressing the occurrence of deformation and cracking.SOLUTION: A mold 4 for a mold conveyor is attached to the mold conveyor that is used for casting molten slag produced by the dry metal smelting while carrying the molten slag. The mold consists of a horizontal vessel whose length in the width direction perpendicular to the conveyance direction is longer than the length in the conveyance direction of the mold conveyor and whose depth D is 100 mm or more and 150 mm or less, the inside of which is partitioned by partition plates 10 so that preferably 4-10 compartments 11 are aligned in the width direction. Each of the compartments 11 has a length L in the conveyance direction of 350 mm or more and 450 mm or less and a length W in the width direction of 150 mm or more and 250 mm or less.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a mold used in a mold conveyor that casts molten slag produced in dry metal smelting while conveying it, and a method for producing massive slag using the mold.

In metal refining by the pyrometallurgy, smelting is carried out by charging raw materials, mainly ores, into a smelting furnace and recovering the metal for smelting as the main product in the form of matte or the like. In this smelting, impurities other than metals for smelting purposes contained in raw materials are discharged in the form of slag as a by-product. For example, in dry copper smelting, raw materials such as copper ore are smelted in a flash furnace to separate impurities as flash furnace slag, and the target metal copper is recovered as a matte with a copper content of about 60% by mass. . The recovered matte is oxidized in a subsequent converter and impurities are separated as converter slag to produce blister copper with a copper content of about 98% by mass. This blister copper is further refined in a refining furnace, formed into an anode for electrolysis by casting, immersed in an electrolytic solution together with a separately prepared cathode, and electrorefined to produce an electric power with a copper content of 99.99% by mass or more. Copper can be made.

Among the slag by-produced in the above-mentioned copper smelting, the flash furnace slag is subjected to water granulation treatment in which pressurized water is injected and quenched to granulate it as necessary. etc. On the other hand, since copper content remains in the converter slag, processing is performed to recover the remaining copper content in the beneficiation process. The recovered copper content is repeated in the flash furnace and processed together with the copper concentrate.

Like the converter slag discharged from the converter for copper smelting described above, the slag from the smelting furnace is discharged in the form of a high-temperature molten slag (hereinafter also referred to as molten slag). Cooling and solidification are performed while being conveyed by a conveying means called a conveyor. For example, in Patent Literature 1, a plurality of molds (hereinafter also referred to as molds) made up of containers that are substantially rectangular in plan view are conveyed on two chains that are stretched over a driving sprocket on the head side and a driven sprocket on the tail side. Disclosed is a mold conveyor having a structure that is evenly spaced in the direction.

Molten slag, which is sequentially poured from the melting furnace into the group of molds at the pouring position on the charging side end of the mold conveyor having the above structure, is cooled and The molds are solidified into a mass, and the molds are sequentially turned over by a drive sprocket located at the discharge end, and are discharged by gravity toward the collection container below. Since the mold conveyor of Patent Document 1 is provided with a rounded portion at the boundary between the inner surface and the bottom surface of the side wall of each mold, it is possible to prevent the solidified slag from adhering to the boundary, thereby preventing the mold from sticking to the boundary. It is stated that the slug can be easily released from the mold when the mold is inverted.

JP-A-10-95643

Since molten slag of 1000° C. or higher is generally cast into the mold of the mold conveyor having the above structure, the temperature is highest at the charging side end, and then the molten slag is cooled while being conveyed toward the discharging side end. The temperature of the mold gradually decreases as it solidifies. After the slag solidified at the discharge side end is discharged, the temperature of the mold drops more rapidly than the temperature drop accompanying the cooling and solidification of the molten slag. The temperature rises again by pouring the molten slag.

For example, in the case of the above dry copper smelting, since the converter slag immediately after being discharged from the converter is a melt of about 1200 to 1300 ° C., the converter slag is cast at the charging side end of the mold conveyor. The temperature of the mold is 450°C or higher immediately after it is loaded, and this temperature drops to about 360°C when it is conveyed to the discharge side end of the mold conveyor, and the converter slag is cast at the charging side end. The temperature drops to about 110° C. just before it is put in. As the converter slag is cast, the temperature of the mold rises again to 450° C. or higher, and thereafter the above-described temperature drop and temperature rise are repeated. As a result, the molds of the mold conveyor may be deformed or cracked due to the thermal stress caused by the above-described temperature drop and temperature rise while the operation is continued.

If the mold is deformed or cracked as described above, there may arise a problem that the molten body scatters around every time the molten body is cast at the pouring position. Furthermore, the above-mentioned deformation and cracking are enlarged by vibrations accompanying the operation of the mold conveyor, and in some cases the mold falls off the mold conveyor, damaging the mold conveyor itself and its peripheral equipment. SUMMARY OF THE INVENTION It is an object of the present invention to provide a mold for a mold conveyor that can suppress the occurrence of deformation and cracking.

In order to achieve the above object, a mold for a mold conveyor according to the present invention is a mold for a mold conveyor that is attached to a mold conveyor that carries and casts molten slag produced by dry metal smelting, wherein the mold conveyor The length of the width direction perpendicular to the conveyance direction is longer than the length in the conveyance direction of the container, and the depth is 100 mm or more and 150 mm or less. It is partitioned by a plate, and each of the plurality of partitions has a length of 350 mm or more and 450 mm or less in the conveying direction and a length of 150 mm or more and 250 mm or less in the width direction.

Further, in the method for producing molten slag according to the present invention, a plurality of molds each composed of a horizontally elongated container having a length in the width direction perpendicular to the conveying direction that is longer than the length in the conveying direction are evenly spaced in the conveying direction. A method for producing massive slag from molten slag produced in dry metal smelting using a mold conveyor provided with a gap, wherein the oblong container is defined by a partition lower than the side wall of the width The interior is partitioned into a plurality of partitions arranged in a direction, and the surface level of the molten slag when poured into the oblong container is between the lowest point and the highest point on the upper edge of the partition plate. It is characterized by adjusting the pouring amount so that it is positioned.

ADVANTAGE OF THE INVENTION According to this invention, the deformation|transformation and crack which arise easily in the casting mold of a mold conveyor can be suppressed.

1 is a schematic side view of a mold conveyor in which a mold for a mold conveyor according to the present invention is preferably used; FIG. It is a perspective view which shows the state by which molten metal is poured into the casting_mold|template for mold conveyors of embodiment of this invention. FIG. 3 is a cross-sectional view of the mold for the mold conveyor of FIG. 2 taken along a plane perpendicular to the width direction of the mold conveyor; FIG. 3 is a cross-sectional view of the mold for the mold conveyor of FIG. 2 taken along a plane perpendicular to the conveying direction of the mold conveyor;

EMBODIMENT OF THE INVENTION Hereafter, embodiment of the casting_mold|template for mold conveyors of this invention is described. The mold for a mold conveyor according to the embodiment of the present invention is used for a mold conveyor that casts molten slag produced in dry metal smelting while conveying it. used for That is, in the mold conveyor shown in FIG. 1, two chains 3 having the form of an endless track are stretched between a driving sprocket 1 on the head side and a driven sprocket 2 on the tail side, and are evenly distributed in the conveying direction indicated by the white arrows. It has a structure in which a plurality of molds 4 are provided at regular intervals.

When the above-mentioned molten slag is converter slag, the molten converter slag flowing out from the tilted ladle 5 is poured into a plurality of molds 4 that sequentially pass through the molten metal pouring position near the driven sprocket 2. 6 is poured. The converter slag cast into the mold 4 in this manner cools and solidifies while being transported toward the drive sprocket 1 . The solidified slag separates from the mold 4 when the mold 4 is turned upside down by the driving sprocket 1, and is discharged downward as a massive slag S. In order to accelerate the cooling and solidification of the slag, cooling water is sprayed onto the slag cast in the mold 4 from above using spraying means 7 such as a spray nozzle.

The lumpy slag S piled up below the mold conveyor as described above is scooped up by, for example, a foil loader and processed in a subsequent ore beneficiation process. Since the lumpy slag S cast by the mold conveyor in this way is generally further processed in a post-process, the converter slag is cast into a small-sized lump by casting it into a mold with a small capacity. is preferred. On the other hand, from the viewpoint of productivity, it is often required to process a large amount of converter slag in a short time.

In order to satisfy the above conflicting requirements, as shown in FIG. 2, the mold conveyor mold 4 of the embodiment of the present invention has a length in the width direction perpendicular to the conveying direction rather than the length in the conveying direction of the mold conveyor. Preferably, a horizontally long container having a long shape and a substantially rectangular shape when viewed from above is used as the main body, and the inside of the container is partitioned by a plurality of partition plates 10 so that a plurality of partitions 11 are arranged in the width direction. In this way, by providing a group of molds 4 consisting of oblong containers whose insides are partitioned by the partition plate 10 so that there is as little gap between molds as possible adjacent to each other in the conveying direction, the melt is continuously supplied from the ladle 5. It becomes possible to sequentially pour the converter slag in the state into the plurality of molds 4 . The number of partitions 11 formed by partitioning the inside of the oblong container with the partition plate 10 is preferably about 4 to 10. Within this range, the number of partitions 11 is preferably an odd number.

By the way, as shown in FIG. 2, the length of the oblong container in the longitudinal direction (that is, the width direction of the mold conveyor) is longer than the width of the trough 6 serving as the pouring port for molten material such as converter slag. Although a sufficient amount of molten material can be cast into the partitioned portion 11 located at the central portion in the longitudinal direction of the partitioned portion 11, the molten material cannot be cast from the central portion to the partitioned portion 11 located at both ends in the longitudinal direction of the oblong container. The casting amount of molten material tends to decrease as it goes. When the amount of molten material poured (also referred to as the amount held) differs between the central portion of the mold 4 and the rest of the mold 4 in this way, the central portion of the mold 4 tends to be heated to a high temperature while the both ends are easily cooled. A large thermal stress was sometimes applied to the mold 4 .

Therefore, in the mold for a mold conveyor according to the embodiment of the present invention, by defining the size of the oblong container that constitutes the main body of the mold 4, the entire length of the oblong container can be made as uniform as possible from one end to the other in the longitudinal direction. Allows the molten body to be cast. As a result, the amount of the molten material held by each section 11 is less likely to be biased, so that the temperature of the mold 4 can be raised and lowered in a well-balanced manner as a whole, and excessive thermal stress is not applied to the mold 4. can be prevented.

Specifically, as shown in FIGS. 3 and 4, in the mold 4 for a mold conveyor according to the embodiment of the present invention, the depth D of the oblong container constituting the main body of the mold 4 is 100 mm or more and 150 mm or less, and the oblong container has a depth D of 100 mm or more and 150 mm or less. Each of the plurality of partitions 11 partitioned by the partition plate 10 inside the container has a length L of 350 mm or more and 450 mm or less in the conveying direction of the mold conveyor and a length in the width direction perpendicular to the conveying direction. The length W is 150 mm or more and 250 mm or less. By defining the size of the oblong container in this manner, the cast molten material can be efficiently cooled in any of the plurality of compartments 11 .

On the other hand, when the volume of the partitioned portion 11 is larger than the volume defined by the above size, the casting amount of molten material for each partitioned portion 11 tends to vary. In this case, it is conceivable that the operator in charge of casting adjusts the amount of molten metal to be poured. Since the pouring amount adjustment work is performed while monitoring from the right or left side of the mold conveyor, if the size of the oblong container becomes larger than the above specified range, the depth of the oblong container including the partition plate 10 becomes deep. It became difficult for the worker to visually confirm the amount of molten metal poured into the compartment 11 at the end of the mold 4 from the above working position, and thus the casting amount for each compartment 11 varied. They were often cast as they were.

If the casting amount of each partitioned portion 11 varies in this way, the molten slag in the partitioned portion 11 located in the central portion in the longitudinal direction of the horizontally elongated container may be insufficiently cooled, The cooling water sprayed from the spraying means 7 may accumulate in the compartments 11 located at both ends, and as a result, excessive thermal stress is likely to be applied to the oblong container. When excessive thermal stress is applied to the oblong container, cracks due to thermal strain are likely to occur particularly in the central portion, and in some cases, the mold 4 may drop off from the mold conveyor.

On the other hand, by keeping the size of the oblong container constituting the main body of the mold 4 within the above specified range, the volume of each partition 11 can be appropriately reduced, and the depth of the oblong container becomes too deep. Therefore, it becomes possible to cast a substantially uniform amount of molten slag into all the compartments 11, and excessive thermal stress is less likely to be applied. In addition, since the heat capacity of the molten slag before cooling can be suppressed by reducing the volume of each partition 11 to some extent, it is possible to reduce the amount of cooling water used to dissipate the heat from the distributing means 7. Even in this case, it is possible to effectively cool and solidify by combining natural cooling.

In addition, if the size of the oblong container constituting the main body of the mold 4 is made smaller than the lower limit value of the above specified range to reduce the capacity of each partition 11, the casting amount of each partition 11 will be reduced and the effect will be greater. However, in this case, it may be necessary to increase the running speed of the mold conveyor in order to secure the desired output. In this way, increasing the running speed of a mold conveyor to which a large number of molds 4 each weighing more than 100 kg are mounted would cause excessive damage to the transport mechanism of the mold conveyor, such as the link chains that support the molds 4 and the rails on which they are placed. , and as a result, mechanical troubles such as wear and breakage tend to occur, which is undesirable.

In the mold 4 for mold conveyor according to the embodiment of the present invention, the value obtained by dividing the capacity of the oblong container by the opening area of the upper end opening is preferably 30 L/m ² or more and 60 L/m ² or less. Here, the capacity of the oblong container is the case where the container is filled beyond the upper edge of the partition plate 10 of the oblong container to the upper edge of the four side walls of the oblong container (that is, when the container is filled to the depth D in FIG. 3). ) capacity. If the capacity per unit opening area is less than 30 L/m ² , the molten slag can be well cooled, but as described above, it may be necessary to increase the running speed of the mold conveyor, which is not preferable. . Conversely, if the capacity per unit opening area exceeds 60 L/m ² , an excessive amount of cooling water is required to cool the cast molten slag, which is undesirable.

Further, in the mold for the mold conveyor of the present invention, as shown in FIG. 3, the height _H1 of the upper edge portion of the partition plate 10 that partitions the inside of the oblong container is lower than the depth D of the oblong container. (However, if the partition plate 10 is provided with a notch as described later, if the height _H2 of the lowest position is lower than the depth D, the height H ₁ need not be lower than depth D). As a result, it is possible to prevent the blocky slags cast in the partitioned portions 11 adjacent to each other from firmly joining together. In addition, the molten slag poured from the gutter 6 toward the central portion in the longitudinal direction of the oblong container can overflow the upper edge of the partition plate 10 without overflowing the side wall of the oblong container. , it becomes possible to spread the molten slag quickly throughout the oblong container. As a result, it becomes possible to cast a substantially uniform amount of molten slag into all the compartments 11, and excessive thermal stress is less likely to be applied to the mold 4. In addition, when the solidified slag is discharged from the mold 4 as the lumped slag S at the discharge side end of the mold conveyor, the plurality of lumped slags S are discharged from the mold 4 as individual lumps for each partition 11 without being firmly connected. can be made This makes it possible to easily and efficiently handle the lumped slag S stacked in the slag storage area below the mold conveyor and to perform further processing as required.

On the other hand, if the height _H1 of the upper edge of the partition plate 10 is not lower than the depth D of the oblong container, the molten slag flows from the gutter 6 toward the center of the oblong container in the longitudinal direction. , the molten slag may overflow from the side walls of the oblong container when the upper edge of the partition plate 10 is overflowed so that the molten slag spreads over both ends of the oblong container. As a countermeasure against this, it is possible to prevent the molten slag from overflowing from the side wall of the oblong container by pouring hot water little by little. It tends to be thicker than the mold 4, and there is a risk that a plurality of massive slags S will be strongly connected, or that excessive thermal stress will be applied to the mold 4.

As described above, when the block-shaped slag S cast in each section 11 is strongly connected to each other, it becomes easy to adhere to the mold 4, and even if the mold 4 is turned over at the end of the mold conveyor on the discharge side, the block-shaped slag is removed from the mold 4. There is a high possibility that the slag S will not be separated. The lumpy slag S, which remains attached to the mold 4 without being separated when the mold 4 is reversed, suddenly separates in the middle of the return path from the discharge side end to the charging side end of the mold conveyor. In some cases, it fell in large chunks, damaging equipment below.

It is preferable that the upper edge of the partition plate 10 that partitions the inside of the oblong container is partially notched. As a result, it is possible to increase the amount of molten slag that overflows the upper edge of the partition plate 10 while suppressing strong connection between the block slags S cast in the partitions 11 adjacent to each other as much as possible. As for the notch provided in each partition plate 10 as mentioned above, it is preferable that there is only one place. The reason for this is that if notches are provided at two or more locations, the connections between the block-shaped slags cast in the adjacent compartments 11 become too strong, and as described above, the mold is cut off at the discharge side end of the mold conveyor. When the mold 4 is turned over, the massive slag S may become difficult to separate from the mold 4 . The shape of the cutout provided in each partition plate 10 is not limited to the inverted trapezoidal shape shown in FIG.

As shown in FIG. 3, when the notch 10a is provided in the upper edge of the partition plate 10, the height _H2 at the lowest position is 50% or more and 80% or less of the depth D of the oblong container. Preferably. If this ratio is less than 50%, the joint between the block-shaped slag S cast in each of the divisions 11 adjacent to each other becomes strong, and when the mold 4 is reversed at the discharge side end of the mold conveyor, each division 11 There is a possibility that the lumped slags cast in the second step may not be separated from the mold 4 while being connected to each other. Conversely, if the ratio exceeds 80%, it is necessary to increase the amount of overflow at the upper edge of the partition plate 10 in order to quickly supply molten slag to both ends in the longitudinal direction of the oblong container during pouring. The block slugs of the adjacent partitions 11 are easily connected firmly.

When the molten slag is poured into the mold for the mold conveyor having the notch 10a in the partition plate 10 as described above, the surface level of the molten slag in the oblong container is higher than the notch 10a provided in the partition plate 10. It is preferable to adjust the pouring amount so that it is higher than the lowest point and lower than the highest point of the upper edge of the partition plate 10 . When the molten slag is poured in such an amount that the molten slag level is below the lowest point of the notch 10a provided in the partition plate 10, it becomes difficult to supply the molten slag to the adjacent partitioned portion 11 due to overflow. Conversely, if the molten slag is poured in such an amount that the level of molten slag rises above the highest position of the upper edge of the partition plate 10, the molten slag may overflow from the side wall of the oblong container.

After pouring the molten slag into the mold 4 for the mold conveyor, it is preferable to spray cooling water from above by the spraying means 7 to the poured molten slag. In this case, the liquid level of the sprayed cooling water in the horizontally elongated container is set to the level of the molten slag so that the sprayed cooling water flows out from the lowest point of the upper edge of the partition plate 10 to the adjacent compartment 11 by overflow. It is preferable to adjust the supply amount of the cooling water so that it is higher than the hot water level and lower than the highest part of the upper edge of the partition plate 10 . If the liquid level of the cooling water in the oblong vessel is lower than the water level, it becomes difficult to uniformly and sufficiently cool the molten slag. Conversely, when the liquid surface level of the cooling water in the oblong container is higher than the highest position of the upper edge of the partition plate 10, the cooling water tends to overflow from the side wall of the oblong container, and the cooling water is wasted. It will be.

(Example 1)
A block slag S was produced from converter slag discharged from a converter of a dry copper refining plant using a mold conveyor having a structure as shown in FIG. As shown in FIG. 2, this mold conveyor used a casting mold 4 consisting of a horizontally elongated container whose width in the direction perpendicular to the conveying direction of the mold conveyor was longer than the length in the conveying direction. Specifically, a horizontally elongated structure in which the inside is partitioned by a partition plate 10 with a part of the upper edge notched so that seven partitions 11 are arranged inside each mold 4 in the width direction of the mold conveyor. A container was used as the body.

3 and 4, the depth D is 100 mm, the length L in the conveying direction of the mold conveyor is 350 mm, and the length W in the width direction perpendicular to the conveying direction is 150 mm. bottom. In addition, the height _H2 of the lowest position of the notch provided on the upper edge of the partition plate 10 is set to 60 mm (that is, 60% of the depth D), and the height of the highest position of the upper edge of the partition plate 10 Height _H1 was set to 100 mm. It was 35 L/m ² when the capacity of the oblong container was divided by the opening area of the upper end opening.

The mold conveyor provided with the mold 4 having the above structure is operated, and the molten slag is fed from the tilted ladle 5 through the gutter 6 toward the longitudinal center of the mold 4 that sequentially passes the pouring position. I poured hot water. At that time, the surface level of the molten slag is higher than the height _H2 of the lowest point of the notch provided in the upper edge of the partition plate 10, and the height H of the highest point of the upper edge of the partition plate 10. The pouring amount was adjusted so as to be lower than ₁ . Furthermore, cooling water was sprayed from above the slag cast in the mold 4 in this manner by a spray nozzle. At that time, the liquid level of the cooling water in the mold 4 is adjusted so that the sprayed cooling water overflows the lowest point of the notch provided in the upper edge of the partition plate 10 and flows out to the adjacent partition 11. is higher than the surface level of the molten slag and lower than the highest part of the upper edge of the partition plate 10.

When one batch of converter slag discharged from the ladle 5 was cast using the mold conveyor having the above structure, casting was performed 1.5 times per mold 4 on average. Since 24 batches of converter slag were cast per day, casting was performed 36 times per day per mold 4 (24 batches/day×1.5 times/batch). When the state of casting into the mold 4 was visually confirmed, it was found that the molten slag was cast almost uniformly up to the compartments 11 at both ends in the longitudinal direction of the oblong container. In addition, the lumped slag S discharged from the discharge side end of the mold conveyor did not include a plurality of lumped slags S connected together.

As a result of continuing the operation of the mold conveyor under the above conditions, the average number of days of use of the mold 4 from the start of operation to the need to replace the mold 4 was 662 days. Here, the length of half or more of the circumferential length of the inner portion of the substantially semi-elliptical shape in the cut surface obtained by cutting the partition portion 11 in the central portion in the longitudinal direction of the oblong container along the plane perpendicular to the longitudinal direction. When a crack with a large diameter entered the oblong container (when multiple cracks occurred, when the sum of their lengths was at least half the length of the circumference), replacement was performed. A large number of cracks were generated particularly at the upper edge of the partitioned portion 11 in the central portion in the longitudinal direction, and no cracks were generated at other locations.

(Example 2)
Inside the mold 4, seven partitions 11 are arranged in the width direction of the mold conveyor. The length W in the width direction perpendicular to is set to 250 mm. In addition, the height _H2 of the lowest position of the notch provided on the upper edge of the partition plate 10 is set to 120 mm (that is, 80% of the depth D), and the height of the highest position of the upper edge of the partition plate 10 Height _H1 was set to 150 mm. It was 51 L/m ² when the capacity of the oblong container was divided by the opening area of the upper end opening. Converter slag discharged from the converter was cast in the same manner as in Example 1 except that the mold 4 having the above size was used.

As a result, in the casting of one batch of converter slag, casting was performed an average of 1.0 times per mold 4, so 24 times per day per mold 4 (24 batches/day × 1.0 times/batch) casting was performed. When the state of casting into the mold 4 was visually confirmed, the molten slag was cast well up to the compartments 11 at both ends in the longitudinal direction of the oblong container. In addition, the lumped slag S discharged from the discharge side end of the mold conveyor did not include a plurality of lumped slags S connected together. The average number of days of use of the mold 4 from the start of operation to the need to replace the mold 4 was 629 days.

(Comparative example)
Inside the mold 4, six partitions 11 are arranged in the width direction of the mold conveyor. The length W in the width direction perpendicular to is set to 260 mm. The highest height _H1 of the upper edge of the partition plate 10 was set to 250 mm, and the upper edge of the partition plate 10 was not provided with a notch. It was 71 L/m ² when the capacity of the oblong container was divided by the opening area of the upper end opening. Converter slag discharged from the ladle 5 was cast in the same manner as in Example 1 except that the mold 4 having the above size was used.

Molten slag was poured toward the center in the longitudinal direction of the mold 4 in the same manner as in Example 1. At this time, the surface level of the molten slag overflowing the upper edge of the partition plate 10 was prevented from becoming as high as possible. The pouring amount was carefully adjusted so that the molten slag reached the compartments 11 at both ends of the mold 4 in the longitudinal direction. Cooling water was sprayed by a spray nozzle in the same manner as in Example 1, but the amount of spraying was adjusted so that all the cooling water would evaporate before the slag was discharged at the end on the discharge side.

When the state of casting into the mold 4 was visually confirmed, the molten slag was cast up to the upper edge of the partition 11 located in the center in the longitudinal direction. Compartment 11 was filled with molten slag less than half its capacity. Also, when the mold 4 was turned over at the discharge side end of the mold conveyor, some cooling water remained in the compartments 11 positioned at both ends in the longitudinal direction. In addition, the lumped slag S discharged from the discharge-side end of the mold conveyor includes a plurality of lumped slags S connected together.

As a result of continuing the operation of the mold conveyor under the above conditions, the average number of days of use of the mold 4 from the start of operation to the need to replace the mold 4 was 337 days. That is, in the comparative example, the number of days in which the mold 4 was used was 325 days shorter than in Example 1. This is because the casting amount of the melt differed between the central portion of the mold 4 and the rest of the mold 4, resulting in a large thermal stress on the mold 4. This is thought to be due to the fact that the Cracks were generated not only in the partitioned portion 11 located in the central portion in the longitudinal direction, but also in the partitioned portions 11 on both end sides of the central portion.

REFERENCE SIGNS LIST 1 drive sprocket 2 driven sprocket 3 chain 4 mold 5 ladle 6 gutter 7 spreading means 10 partition plate 10a notch 11 partition S lump slag

Claims (9)

A mold for a mold conveyor that is attached to a mold conveyor that casts while conveying molten slag produced by dry metal smelting,
It consists of a horizontally long container having a length in the width direction perpendicular to the conveying direction longer than the length in the conveying direction of the mold conveyor and a depth of 100 mm or more and 150 mm or less, and a plurality of compartments are arranged in the width direction inside the container. Each of the plurality of partitions has a length of 350 mm or more and 450 mm or less in the conveying direction and a length of 150 mm or more and 250 mm or less in the width direction. A mold for a mold conveyor. 2. The mold for a mold conveyor according to claim 1, wherein the horizontal container has a capacity divided by the opening area of the upper end opening of 30 L/m ^<2> or more and 60 L/m ^<2> or less. 3. The mold for a mold conveyor according to claim 1, wherein the number of said plurality of compartments is 4-10. The mold for a mold conveyor according to any one of claims 1 to 3, wherein the height of the upper edge of the partition plate is lower than the depth of the oblong container. The upper edge of the partition plate is partially notched, and the height of the notched portion is 50% or more and 80% or less of the depth of the oblong container, The mold for a mold conveyor according to any one of claims 1 to 4 A mold conveyor having drive-side and driven-side sprockets, an endless track that spans these sprockets, and a plurality of molds that are provided at equal intervals in the conveying direction of the endless track, wherein the plurality of A mold conveyor, wherein the mold for a mold conveyor according to any one of claims 1 to 5 is used for each of the molds. 7. The mold conveyor according to claim 6, further comprising means for spraying cooling water from above on the molten slag cast in the plurality of molds. Using a mold conveyor in which a plurality of molds each composed of a horizontally elongated container whose length in the width direction perpendicular to the conveying direction is longer than the length in the conveying direction are provided at equal intervals in the conveying direction, A method for producing massive slag from molten slag produced in dry metal smelting, comprising:
The oblong container is partitioned inside into a plurality of compartments arranged in the width direction by partition plates lower than the side walls thereof, and when the molten slag is poured into the oblong container, the surface level of the partition plates is A method for producing massive slag, characterized in that the amount of molten metal to be poured is adjusted so as to be positioned between the lowest point and the highest point on the upper edge. against the poured molten slag so that the liquid level of the cooling water is maintained at a level higher than the molten slag surface level and lower than the highest point on the upper edge of the partition plate. 9. The method for producing massive slag according to claim 8, wherein cooling water is sprayed from above.

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