Mold for mold conveyor and method for producing lump slag using the same

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]

[0001] The present invention relates to a mold used in a mold conveyor that transports and casts molten slag produced by dry metal smelting, and to a method for producing lumped slag using the mold. [Background technology]

[0002] In dry metal smelting, raw materials, primarily ores, are loaded into a smelting furnace, and the target metal is recovered as a matte or other form as the primary product. In this process, impurities contained in the raw materials, other than the target metal, are discharged as a by-product in the form of slag. For example, in dry copper smelting, raw materials such as copper ore are melted in a flash furnace, impurities are separated as flash furnace slag, and the target metal, copper, is recovered as matte with a copper content of approximately 60% by mass. The recovered matte is then oxidized in a downstream converter, and the impurities are separated as converter slag, producing blister copper with a copper content of approximately 98% by mass. This blister copper is then further refined in a refining furnace and cast into an electrolytic anode. This anode is then immersed in an electrolytic solution together with a separately prepared cathode for electrolytic refining, producing electrolytic copper with a copper content of 99.99% by mass or more.

[0003] Of the slag by-products of copper smelting, flash slag is used as caisson fill material, blast material, roadbed material, etc., after being subjected to a water granulation process, where pressurized water is sprayed onto the slag to rapidly cool it and granulate it, as needed. On the other hand, converter slag contains residual copper, so it is subjected to a process to recover this remaining copper in the ore dressing process. The recovered copper is then repeatedly returned to the flash smelting furnace and processed together with the copper concentrate.

[0004] Like the converter slag discharged from a copper smelting converter, slag from a smelting furnace is discharged in the form of a high-temperature molten material (hereinafter also referred to as molten slag), and the molten slag is cooled and solidified while being transported by a transport means called a mold conveyor. For example, Patent Document 1 discloses a mold conveyor having a structure in which a plurality of molds (hereinafter also referred to as casting dies), consisting of containers that are approximately rectangular in plan view, are attached at equal intervals in the transport direction to two chains that are stretched over a driving sprocket on the head side and a driven sprocket on the tail side.

[0005] The molten slag poured from the melting furnace into the group of molds at the charging end of the mold conveyor is cooled and solidified as it is transported continuously toward the discharge end of the mold conveyor, and as the group of molds is turned over by a drive sprocket at the discharge end, it is discharged by gravity into a collection container below. The mold conveyor in Patent Document 1 is described as having a rounded portion at the boundary between the inner and bottom surfaces of the side walls of each mold, which prevents the solidified slag from adhering to this boundary, making it easy to remove the slag from the mold when it is turned over. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 10-95643 Summary of the Invention [Problem to be solved by the invention]

[0007] The molds of the mold conveyor with the above structure are usually filled with molten slag at temperatures above 1000 ° C, so they are hottest at the charging end. As the molten slag cools and solidifies, the temperature of the mold gradually decreases as it is transported toward the discharge end. After the solidified slag is discharged from the discharge end, the mold temperature drops more rapidly than the temperature drop caused by the cooling and solidification of the molten slag. However, the temperature rises again when molten slag is poured into the mold at the charging end.

[0008] For example, in the case of the above-mentioned dry copper smelting, converter slag immediately after being discharged from the converter is molten at approximately 1200 to 1300°C. Therefore, the temperature of the mold immediately after the converter slag is poured at the charging end of the mold conveyor is 450°C or higher. This temperature drops to approximately 360°C when the converter slag is transported to the discharge end of the mold conveyor, and then drops to approximately 110°C just before the converter slag is poured at the charging end. Then, as the converter slag is poured, the temperature of the mold rises again to above 450°C, and the above temperature drop and rise are repeated thereafter. As a result, the molds of the mold conveyor can become deformed or cracked due to the thermal stress caused by the temperature drop and rise during continued operation.

[0009] If the mold is deformed or cracked as described above, the molten metal may splatter around the area whenever the molten metal is poured into the pouring position. Furthermore, the deformation and cracking may be exacerbated by vibrations caused by the operation of the mold conveyor, and in some cases, the mold may fall off the mold conveyor, damaging the mold conveyor itself and its surrounding equipment. The present invention was made in consideration of the problems inherent in conventional mold conveyors, and aims to provide a mold for a mold conveyor that can suppress deformation and cracking. [Means for solving the problem]

[0010] In order to achieve the above object, the 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 transports and casts molten slag produced by dry metal smelting, and is composed of a horizontally elongated container whose width perpendicular to the conveying direction is longer than the length in the conveying direction of the mold conveyor and whose depth is 100 mm to 150 mm, and whose inside is divided by partition plates so that multiple compartments are arranged in the width direction, and each of the multiple compartments has a length in the conveying direction of 350 mm to 450 mm and a length in the width direction of 150 mm to 250 mm.

[0011] The method for producing molten slag according to the present invention is a method for producing lumps of slag from molten slag produced by dry metal smelting using a mold conveyor in which a number of molds, each consisting of an oblong container whose width, perpendicular to the conveying direction, is longer than its length in the conveying direction, are arranged at equal intervals in the conveying direction. The oblong container is divided on the inside into a number of compartments arranged in the width direction by partition plates lower than the side walls, and the amount of molten slag poured into the oblong container is adjusted so that the level of the molten slag when poured is located between the lowest and highest points on the upper edge of the partition plates. [Effects of the Invention]

[0012] According to the present invention, deformation and cracking that tend to occur in the mold of a mold conveyor can be suppressed. [Brief explanation of the drawings]

[0013] [Figure 1] 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. [Figure 2] FIG. 2 is a perspective view showing a state in which molten metal is being poured into a mold for a mold conveyor according to an embodiment of the present invention. [Figure 3] 3 is a cross-sectional view of the mold for the mold conveyor of FIG. 2 cut along a plane perpendicular to the width direction of the mold conveyor. FIG. [Figure 4] 3 is a cross-sectional view of the mold for the mold conveyor of FIG. 2 cut along a plane perpendicular to the conveying direction of the mold conveyor. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of a mold for a mold conveyor of the present invention will be described. The mold for a mold conveyor of this embodiment of the present invention is used in a mold conveyor that casts molten slag produced by dry metal smelting while transporting it, and is suitable for use in a mold conveyor having a structure such as that shown in Fig. 1. That is, the mold conveyor shown in Fig. 1 has a structure in which a plurality of molds 4 are provided at equal intervals in the conveying direction indicated by the white arrow on a two-strand chain 3 having an endless track shape that is stretched between a driving sprocket 1 on the head side and a driven sprocket 2 on the tail side.

[0015] If the molten slag is converter slag, the molten converter slag is poured from a tilted ladle 5 through a trough 6 into multiple molds 4 that pass sequentially through a pouring position near the driven sprocket 2. The converter slag poured into the molds 4 in this way cools and solidifies as it is transported toward the driving sprocket 1. When the driving sprocket 1 rotates the molds 4 inverted, the solidified slag is detached from the molds 4 and discharged downward as lumped slag S. To accelerate the cooling and solidification of the slag, cooling water is sprayed from above onto the slag poured into the molds 4 using a spraying means 7 such as a spray nozzle.

[0016] The lumps of slag S piled up below the mold conveyor as described above are scooped up, for example, by a wheel loader and processed in a downstream process such as a mineral dressing process. Since the lumps of slag S cast on the mold conveyor are generally further processed in downstream processes, it is preferable to cast the converter slag into small-capacity molds to form small lumps. However, from the viewpoint of productivity, it is often necessary to process a large amount of converter slag in a short period of time, which requires an increase in the casting capacity of the entire mold conveyor.

[0017] In order to satisfy the above-mentioned conflicting requirements, as shown in Fig. 2, the mold 4 for the mold conveyor according to the embodiment of the present invention is preferably a rectangular container in plan view, the length of which is longer in the width direction perpendicular to the conveying direction of the mold conveyor than in the conveying direction of the mold conveyor, and the inside of the container is divided by a plurality of partition plates 10 so that a plurality of compartments 11 are arranged in the width direction. In this way, by arranging a group of molds 4 consisting of a rectangular container whose inside is divided by partition plates 10 so that there is as little gap as possible between adjacent molds in the conveying direction, it is possible to sequentially pour the molten converter slag continuously supplied from the ladle 5 into these molds 4. The number of compartments 11 formed by dividing the inside of the oblong container with partition plates 10 is preferably about 4 to 10, and preferably an odd number within this range.

[0018] 2, the length of the oblong vessel in the longitudinal direction (i.e., the width direction of the mold conveyor) is longer than the width of the trough 6, which serves as the pouring port for the molten material such as converter slag. Therefore, although a sufficient amount of molten material can be poured into the central compartment 11 of the multiple compartments 11 in the longitudinal direction, the amount of molten material poured tends to decrease from the central compartment toward the compartments 11 at both ends in the longitudinal direction of the oblong vessel. If the pouring amount (also referred to as the holding amount) of the molten material differs between the central part of the mold 4 and the other parts, the central part of the mold 4 tends to become hot, while the opposite ends tend to cool, which can result in a large thermal stress being applied to the mold 4.

[0019] Therefore, in the mold for a mold conveyor according to an embodiment of the present invention, the size of the oblong container constituting the main body of the mold 4 is specified so that the molten material is poured as uniformly as possible throughout the entire oblong container from end to end in the longitudinal direction. This makes it difficult for the amount of molten material held in each compartment 11 to be uneven, making it possible to raise and lower the temperature of the mold 4 in a balanced manner as a whole, and preventing excessive thermal stress from being applied to the mold 4.

[0020] 3 and 4, the mold 4 for a mold conveyor according to an embodiment of the present invention has a depth D of 100 mm to 150 mm of an oblong container constituting the main body of the mold 4, and each of a plurality of compartments 11 separated by partition plates 10 inside the oblong container has a length L of 350 mm to 450 mm in the conveying direction of the mold conveyor and a width W of 150 mm to 250 mm in the width direction perpendicular to the conveying direction. By specifying the size of the oblong container in this way, the cast molten metal can be efficiently cooled in each of the plurality of compartments 11.

[0021] On the other hand, if the volume of the compartments 11 becomes larger than the volume specified by the above size, variations tend to occur in the amount of molten material poured into each compartment 11. In this case, it is conceivable to deal with the problem by having the worker in charge of casting adjust the amount of molten material poured, but since the worker normally adjusts the amount of molten material poured while monitoring from the right or left side of the mold conveyor and is located upstream of the pouring position in the direction of travel 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, making it difficult for the worker to visually check the amount of molten material poured into the compartments 11 at the ends of the mold 4 from the above working position, and as a result, casting often occurs with variations in the amount of molten material poured into each compartment 11.

[0022] If the pouring amount varies from one compartment 11 to another, the cooling of the molten slag in the compartment 11 located in the longitudinal center of the oblong vessel may be insufficient, or the cooling water sprayed from the spraying means 7 may accumulate in the compartments 11 located at both ends in the longitudinal direction of the oblong vessel, resulting in excessive thermal stress being applied to the oblong vessel. If excessive thermal stress is applied to the oblong vessel, cracks due to thermal distortion may easily occur, especially in the central part, and in some cases, the mold 4 may fall off the mold conveyor.

[0023] On the other hand, by keeping the size of the oblong vessel constituting the main body of the mold 4 within the above-mentioned range, it is possible to appropriately reduce the volume of each compartment 11 and prevent the oblong vessel from becoming too deep, which makes it possible to pour a substantially uniform amount of molten slag into all compartments 11 and reduces the risk of excessive thermal stress. Furthermore, by reducing the volume of each compartment 11 to a certain extent, the heat capacity of the molten slag before cooling can be reduced, which reduces the amount of cooling water used to remove heat from the spraying means 7. Even in this case, by allowing the slag to cool naturally, it is possible to effectively cool and solidify it.

[0024] If the size of the oblong container constituting the main body of the mold 4 is made smaller than the lower limit of the above-mentioned range, thereby reducing the capacity of each compartment 11, the amount of casting in each compartment 11 will be reduced, allowing for more effective cooling and solidification, but in this case, it may be necessary to increase the running speed of the mold conveyor to ensure the desired production volume. In this way, increasing the running speed of a mold conveyor equipped with a large number of molds 4, each of which generally weighs more than 100 kg, places excessive strain on the mold conveyor's transport mechanism, such as the link chains supporting the group of molds 4 and the rails on which they are carried, which results in increased susceptibility to mechanical problems such as wear and breakage, and is therefore undesirable.

[0025] In the mold conveyor mold 4 according to the embodiment of the present invention, the value obtained by dividing the capacity of the oblong container by the opening area of ​​its upper end opening is 30 L / m 2 More than 60L / m 2Here, the capacity of the oblong container refers to the capacity when the oblong container is filled beyond the upper edge of the partition plate 10 to the upper edges of the four side walls of the oblong container (i.e., when the container is filled to a depth D in FIG. 3). 2 If the capacity per unit opening area is less than 60 L / m, the molten slag can be cooled well, but as mentioned above, it may be necessary to increase the running speed of the mold conveyor, which is not preferable. 2 If the temperature exceeds this range, an excessive amount of cooling water will be required to cool the poured molten slag, which is undesirable.

[0026] In addition, as shown in FIG. 3, the mold for a mold conveyor of the present invention preferably has a height H1 of the upper edge of the partition plate 10 that divides the interior of the oblong container. (However, if the partition plate 10 has a notch, as described below, the height H1 of the upper edge does not have to be lower than the depth D, as long as the height H2 of its lowest point is lower than the depth D.) This prevents the lumps of slag cast in adjacent compartments 11 from bonding together. Furthermore, the molten slag poured from the trough 6 toward the longitudinal center of the oblong container can overflow the upper edge of the partition plate 10 without overflowing the side walls of the oblong container. This allows the molten slag to be quickly distributed throughout the entire oblong container. As a result, a substantially uniform amount of molten slag can be poured into all compartments 11, reducing the amount of thermal stress on the mold 4. Furthermore, when the solidified slag is discharged from the mold 4 as lumped slag S at the discharge end of the mold conveyor, the lumped slag S can be discharged from the mold 4 as individual lumps for each compartment 11 without being tightly joined together. This makes it possible to easily and efficiently handle the lumped slag S piled up in the slag storage area below the mold conveyor and to perform further processing as needed.

[0027] 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 vessel, when pouring the molten slag from the trough 6 toward the longitudinal center of the oblong vessel, the molten slag may overflow from the side walls of the oblong vessel when the molten slag is allowed to overflow from the upper edge of the partition plate 10 to spread to both ends of the oblong vessel. To prevent this, pouring the molten slag little by little can prevent the molten slag from overflowing from the side walls of the oblong vessel. However, in this case, the thickness of the slag in the longitudinal center of the oblong vessel is likely to be thicker than in other areas, which may cause multiple lumps of slag S to bond tightly together or may cause excessive thermal stress on the mold 4.

[0028] As described above, if the lumps of slag S cast in each compartment 11 are firmly connected to each other, they tend to adhere to the mold 4, and even if the mold 4 is turned over at the discharge end of the mold conveyor, the lumps of slag S are likely to not detach from the mold 4. In this way, the lumps of slag S that do not detach when the mold 4 is turned over and remain attached to the mold 4 may suddenly detach on the way back from the discharge end of the mold conveyor to the loading end, and in this case, they may fall in large chunks, causing damage to the equipment below.

[0029] The partition plates 10 separating the interior of the oblong container preferably have a partial cutout at their upper edges. This minimizes the strong bond between the lumps of slag S cast in adjacent compartments 11, while increasing the amount of molten slag that overflows the upper edge of the partition plate 10. As described above, each partition plate 10 preferably has only one cutout. This is because if two or more cutouts are provided, the lumps of slag cast in adjacent compartments 11 may be too strongly bonded together, which may make it difficult for the lumps of slag S to be released from the mold 4 when the mold 4 is inverted at the discharge end of the mold conveyor, as described above. The shape of the cutouts provided in each partition plate 10 is not limited to the inverted trapezoidal shape shown in FIG. 3, but may also be rectangular, V-shaped, semi-elliptical, or other shapes.

[0030] As shown in Figure 3, when a notch 10a is provided in the upper edge of the partition plate 10, it is preferable that the height H2 at its lowest point is 50% to 80% of the depth D of the oblong container. If this ratio is less than 50%, the lumps of slag S cast in adjacent compartments 11 will be strongly bonded together, and when the mold 4 is inverted at the discharge end of the mold conveyor, the lumps of slag cast in each compartment 11 may remain connected and not be able to be removed from the mold 4. Conversely, if the ratio exceeds 80%, it is necessary to increase the overflow amount at the upper edge of the partition plate 10 in order to quickly supply the molten slag to both ends of the oblong container during pouring, which makes it easier for the lumps of slag in adjacent compartments 11 to be strongly bonded together.

[0031] When pouring molten slag into a mold conveyor mold having a notch 10a in the partition plate 10 as described above, it is preferable to adjust the amount of molten slag poured so that the level of the molten slag in the oblong container is higher than the lowest point of the notch 10a in the partition plate 10 and lower than the highest point of the upper edge of the partition plate 10. If the molten slag is poured at an amount that brings the molten slag level below the lowest point of the notch 10a in the partition plate 10, it will be difficult to supply the molten slag to the adjacent compartment 11 due to overflow. Conversely, if the molten slag is poured at an amount that brings the molten slag level above the highest point of the upper edge of the partition plate 10, the molten slag may overflow from the side walls of the oblong container.

[0032] After the molten slag is poured into the mold 4 for the mold conveyor, it is preferable to spray cooling water onto the poured molten slag from above using the spraying means 7. In this case, it is preferable to adjust the supply of cooling water so that the level of the sprayed cooling water in the oblong container is higher than the level of the molten slag but lower than the highest point of the upper edge of the partition plate 10, so that the sprayed cooling water can overflow from the lowest point of the upper edge of the partition plate 10 and flow into the adjacent compartment 11. If the level of the cooling water in the oblong container is lower than the level of the molten slag, it will be difficult to cool the molten slag uniformly and sufficiently. Conversely, if the level of the cooling water in the oblong container is higher than the highest point of the upper edge of the partition plate 10, the cooling water will easily overflow from the side walls of the oblong container, resulting in unnecessary consumption of cooling water. [Example]

[0033] Example 1 Using a mold conveyor having a structure as shown in Figure 1, lumpy slag S was produced from converter slag discharged from a converter in a dry copper refining plant. For this mold conveyor, a mold 4 was used, which was a horizontally elongated container whose width, perpendicular to the conveying direction, was longer than its length in the conveying direction of the mold conveyor, as shown in Figure 2. Specifically, a horizontally elongated container was used as the main body, with the inside divided by partition plates 10 with a portion of the upper edge cut out so that seven compartments 11 were arranged inside each mold 4 in the width direction of the mold conveyor.

[0034] 3 and 4, the dimensions of each partition 11 are as follows: depth D is 100 mm, length L in the conveying direction of the mold conveyor is 350 mm, and length W in the width direction perpendicular to the conveying direction is 150 mm. The height H2 of the lowest position of the notch provided in the upper edge of the partition plate 10 is 60 mm (i.e., 60% of the depth D), and the height H1 of the highest position of the upper edge of the partition plate 10 is 100 mm. The capacity of the oblong container divided by the opening area of ​​its upper end opening is 35 L / m 2 It was.

[0035] A mold conveyor equipped with the molds 4 of the above structure was operated, and molten slag was poured from a tilted ladle 5 through a trough 6 toward the longitudinal center of the molds 4, which passed through the pouring position one after another. The amount of poured molten slag was adjusted so that the level of the molten slag was higher than the height H2 of the lowest point of the notch in the upper edge of the partition plate 10 and lower than the height H1 of the highest point of the upper edge of the partition plate 10. Furthermore, cooling water was sprayed from above onto the slag poured into the mold 4 using a spray nozzle. The amount of cooling water sprayed was adjusted so that the level of the cooling water in the mold 4 was higher than the level of the molten slag but lower than the highest point of the upper edge of the partition plate 10, so that the sprayed cooling water could overflow the lowest point of the notch in the upper edge of the partition plate 10 and flow into the adjacent compartment 11.

[0036] When one batch of converter slag discharged from the ladle 5 was cast using the mold conveyor of the above structure, an average of 1.5 castings were performed per mold 4. 24 batches of converter slag were cast per day, resulting in 36 castings per day per mold 4 (24 batches / day x 1.5 castings / batch). Visual inspection of the pouring into the mold 4 revealed that the molten slag was poured almost uniformly up to the compartments 11 at both ends of the longitudinal direction of the oblong container. Furthermore, the lumps of slag S discharged from the discharge end of the mold conveyor did not contain multiple lumps of slag S joined together.

[0037] As a result of continuing 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 until it required replacement was 662 days. Here, mold replacement was performed when a crack measuring half or more of the circumference of the inner part of the approximately semi-elliptical shape of a cross section of the compartment 11 in the longitudinal center of the oblong container was formed in the oblong container (in the case of multiple cracks, when the total length of the cracks was half or more of the circumference). Note that the cracks occurred most frequently, particularly at the upper edge of the compartment 11 in the longitudinal center, and no cracks occurred in other areas.

[0038] Example 2 Inside the mold 4, seven partitions 11 were arranged in the width direction of the mold conveyor, and the dimensions of each were a depth D of 150 mm, a length L in the conveying direction of the mold conveyor of 450 mm, and a width W perpendicular to the conveying direction of 250 mm. The height H2 of the lowest position of the notch provided in the upper edge of the partition plate 10 was 120 mm (i.e., 80% of the depth D), and the height H1 of the highest position of the upper edge of the partition plate 10 was 150 mm. The capacity of the oblong container divided by the opening area of ​​its upper end opening was 51 L / m 2 Converter slag discharged from a converter was cast in the same manner as in Example 1, except that a mold 4 having the above size was used.

[0039] As a result, one batch of converter slag was cast on average 1.0 times per mold 4, meaning that 24 times per day (24 batches / day x 1.0 time / batch) were cast per mold 4. Visual inspection of the casting into the mold 4 revealed that the molten slag had been poured well into the compartments 11 at both ends of the longitudinal direction of the oblong vessel. Furthermore, the lumps of slag S discharged from the discharge end of the mold conveyor did not contain multiple lumps of slag S joined together. The average number of days that the mold 4 was used from the start of operation until it needed to be replaced was 629 days.

[0040] (Comparative Example) Six partitions 11 were arranged inside the mold 4 in the width direction of the mold conveyor, and the dimensions of each were a depth D of 250 mm, a length L in the conveying direction of the mold conveyor of 450 mm, and a width W perpendicular to the conveying direction of 260 mm. The height H1 of the highest point of the upper edge of the partition plate 10 was 250 mm, and no notch was provided in the upper edge of the partition plate 10. The capacity of the oblong container was divided by the opening area of ​​its upper end opening, resulting in 71 L / m 2 Converter furnace slag discharged from the ladle 5 was cast in the same manner as in Example 1, except that a mold 4 having the above size was used.

[0041] As in Example 1, the molten slag was poured toward the center of the mold 4 in the longitudinal direction, but the amount of poured was adjusted so that the molten slag reached the partitions 11 at both ends of the mold 4 in the longitudinal direction, while taking care to keep the level of the molten slag that overflowed the upper edge of the partition plate 10 as low as possible. Also, as in Example 1, cooling water was sprayed using a spray nozzle, but the amount sprayed was adjusted so that all of the cooling water evaporated before the slag was discharged from the discharge end.

[0042] Visual inspection of the pouring into the mold 4 revealed that the compartment 11 located in the longitudinal center was filled with molten slag up to its upper edge, but that the compartments 11 located at both longitudinal ends were filled with less than half their capacity. Furthermore, when the mold 4 was turned over at the discharge end of the mold conveyor, cooling water was found to remain in some of the compartments 11 located at both longitudinal ends. Furthermore, the lumps of slag S discharged from the discharge end of the mold conveyor contained multiple pieces of lumps of slag S joined together.

[0043] As a result of continuing to operate the mold conveyor under the above conditions, the number of days that mold 4 was in use from the start of operation until it needed to be replaced was 337 days on average. That is, in the comparative example, the number of days that mold 4 was in use was 325 days shorter than in Example 1. This is thought to be because the amount of molten material poured into the center of mold 4 was different from that in the other areas, which resulted in large thermal stress being applied to mold 4. Note that cracks occurred not only in the compartment 11 located in the longitudinal center, but also in the compartments 11 on both ends of the center. [Explanation of symbols]

[0044] 1 drive sprocket 2 driven sprockets 3 Chain 4. Mold 5 ladles 6. Gutter 7 Spreading means 10 Divider 10a Notch 11 Compartment S Lump slag

Claims

1. A mold conveyor mold attached to a mold conveyor that transports and casts molten slag produced by dry metal smelting, A mold for a mold conveyor, characterized in that it consists of an oblong container whose length in a width direction perpendicular to the conveying direction is longer than the length in the conveying direction of the mold conveyor and whose depth is 100 mm to 150 mm, and its inside is divided by partition plates so that a plurality of partitions are aligned in the width direction, and each of the plurality of partitions has a length in the conveying direction of 350 mm to 450 mm and a length in the width direction of 150 mm to 250 mm.

2. The oblong container has a capacity of 30 L / m2 divided by the area of ​​the opening at the top end. ２ More than 60L / m ２ 2. The mold conveyor mold according to claim 1, characterized in that:

3. 3. The mold for a mold conveyor according to claim 1, wherein the number of the plurality of partitions is 4 to 10.

4. 4. The mold for a mold conveyor according to claim 1, wherein the height of the upper edge of the partition plate is lower than the depth of the oblong container.

5. 5. The mold for a mold conveyor according to claim 1, wherein the upper edge of the partition plate is partially cut out, and the height of the cutout portion is 50% to 80% of the depth of the oblong container.

6. A mold conveyor having drive and driven sprockets, an endless track stretched over these sprockets, and a plurality of molds provided at equal intervals in the conveying direction of the endless track, wherein each of the plurality of molds uses a mold conveyor mold according to any one of claims 1 to 5.

7. 7. The mold conveyor according to claim 6, further comprising means for spraying cooling water from above onto the molten slag poured into the plurality of molds.

8. A method for producing lumped slag from molten slag produced by dry metal smelting using a mold conveyor in which a plurality of molds, each of which is an elongated container whose width direction perpendicular to the conveying direction is longer than its length in the conveying direction, are provided at equal intervals in the conveying direction, The method for producing lumpy slag is characterized in that the interior of the oblong container is divided into a plurality of compartments arranged in the width direction by partition plates lower than the side walls, and the amount of molten slag poured is adjusted so that the molten slag level when poured into the oblong container is located between the lowest and highest points on the upper edge of the partition plates.

9. 9. A method for producing lumpy slag according to claim 8, characterized in that cooling water is sprayed onto the poured molten slag from above so that the liquid level of the cooling water is maintained at a level higher than the surface level of the molten slag and lower than the highest point at the upper edge of the partition plate.

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