FI121567B - Wave scoop to measure and pour a predetermined amount of melt into a mold - Google Patents

Description

Weighing scoop to measure and pour a predetermined amount of melt into the mold

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weighing scoop for measuring and pouring a predetermined amount of melt into a mold used in an anode casting machine. More specifically, the present invention relates to a weighing bucket for measuring a predetermined weight of a metal alloy of precious metals such as copper (later referred to simply as "melt"), 10 which then feeds a predetermined amount of melt into the mold.

2. Description of relevant techniques

In the smelting of copper, the raw copper is subjected to an anode furnace for oxidation and reduction to produce approximately 99.5% purified crude copper. This refined crude copper is cast into a mold to form a crude copper-15 molding in the form of a sheet referred to as an anode.

Generally, purified copper is drained from a pair of anode ovens and passed through a gutter to the intermediate casing where the purified copper is once stored. The purified crude copper is then drained into a dosing bucket equipped with a weighing cell with a weighing function.

Referring to Figure 2, a conventional anode casting device is shown. Kaksikym seed is a mold which is schematically indicated by the reference numerals 3 (1) through 3 (20) C., is arranged circumferentially on a turntable 1 which is rotated in the direction indicated by the arrow treatments.

The copper melt is weighed into a measuring cup 10 to pour a predetermined amount, for example 350 kg, into a mold 3 (i), 3 (2), 3 (3), ... 3 (20>, rotating table 1).

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^ during rotation. An enlarged top view of one mold is shown in Fig. 3. The molds 3 (3) to 3 <n) are cooled in the water cooling zone 5. It is obvious that o the other molds are successively introduced into the cooling zone 5 by a rotating table 1.

^ Cooling water is sprayed into molds 3 and molds cast into molds 3.

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To 30 lat and the melt will solidify in molds 3. The cooled and solidified melt will be removed-

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is discharged from mold 3 (15) and the anode thus obtained is subjected to an electrolytic purification process.

A release agent, such as clay powder, is applied to the inner surface of the mold 3 (18), where the anode has been removed. The copper melt is again cast into mold 3 (i), which has been subjected to the application of a release agent as described above. The anode casting operation is continued as described above until the anode ovens become free.

A dosing bucket 10 having a weighing function, hereinafter referred to as a weighing bucket 10, is shown in Figures 4 (a) and (b) and corresponding to the top-5 view and the longitudinal section respectively. The weighing bucket 10 has a generally flat and rectangular shape. The recess 11 has an effective depth (De) to store a predetermined amount of melt.

The drain spout 13 is adjacent to the recess 11 and has an outlet 13a at the left end of Figures 4 (a) and (b) for pouring a light-doped melt into the mold 3 (Figure 3). The spout is gradually lower in the direction of the spout 13. The melt is poured from the spacer (not shown) into the recess 11 of the weighing bucket 10.

Each side wall 10a of the weighing bucket 10 is provided with support bars 23 and 25 for gripping hooks disposed at the front end of the rods (not shown) for hanging the weighing bucket.

The weighing bucket 10 is inclined about the support shaft 21, which protrudes from each of the two sidewalls between the support bars 23 and 25 by changing the height of the bars (not shown).

Slag consisting of a foreign substance such as copper oxides may float on the surface of the melt pool in a weighing bucket 10 and may enter the mold. The slag clamp 15 is disposed above the support shaft 15 and extends across each side wall 10a and prevents slag from entering the mold. The slag entering the mold 3 (Fig. 3) severely impairs the electrical conductivity and thus degrades the quality of the electrolytically purified copper.

25 As described above, when the melt is poured from a spacer (not shown) into a conventional weighing bucket 10, the melt poured into a weighing bucket 10

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The weight is measured by a weighing cell (not shown) provided with a weighing bucket ^ 10. When the weighing cell detects that the melt mass has reached a predetermined amount V, the pouring of melt from the spacer is stopped and the weighing bucket is tilted with its support plate about the support shaft 21. One an-

The erosion melt is thus poured into mold 3 (Fig. 3).

When the melt is poured into the cavity 11, droplets of the melt spatter and precipitate on the upper edges of the side walls 10a. Precipitated melt droplets cool down and solidify. During repeated castings, melt droplets accumulate and grow on the solidified droplets as shown in 30a. As the melt is poured from a weighing bucket 10 into a mold, a portion of the melt flows under the precipitates in the outlet 3a 13 and solidifies and grows as shown in 30b.

Deposits 30a and 30b are referred to as "casting scabs" and provide an inaccurate casting control. In addition, as the casting screws 30a and 30b grow large, they may fall into the mold and form convexities on the anode surface, i.e. anode failure. Therefore, it is necessary to remove the casting screws 30a, 30b from the weighing bucket 10.

Japanese Unexamined Patent Publication (cocai) no. 2004-230434 (hereinafter referred to as "Patent Publication 1") proposes a device for removing casting chips 10 at multiple positions on a rotary table. More precisely, the casting screws 30b formed at the front end of the weighing bucket are scraped off by means of rods or the like attached to the rotary table.

Japanese Unexamined Patent Publication (cocai) no. 11-254123 (hereinafter referred to as "Patent Publication 2") discloses an improved weighing 15 refractory lining. Patent Publication 2 does not propose a casting scavenger remover, but discloses an improved refractory lining for a weighing bucket which facilitates such removal and enables easy repair of the refractory lining that has been removed.

Fl 20040477 A (hereinafter referred to as "Patent 20") discloses a weighing scoop for measuring and pouring a predetermined amount of melt by tilting the scoop around an axis of rotation. The bucket comprises a recess of sufficient depth to store a predetermined amount of melt poured into it. The bucket also comprises an outlet spout for pouring melt into the mold and a spout recess between the outlet spout. The trough-25 trough is lower in the direction of the outlet spout and is located downstream of the recess and the rotating axis of the weighing bucket.

? This publication describes the melt splashing out of the mold. The melting of the melt from the weighing bucket or trough is not described at all. As v attention is paid to the problem of melt splashing in mold 30, the melt poured into the mold is sought to be kept as calm as possible. In Fl 20040477 A, the main principle is that

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the kinetic energy of the molten metal is kept as low as possible and the pouring height of the melt into the mold is kept as low as possible.

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Summary of the Invention

The casting screws 30a are manually removed by cutting them using a lan set fed with fuel and air. Because this is a very dangerous operation, the removal of casting scabs cannot be performed during casting and the casting operation must therefore be stopped. Therefore, casting efficiency is adversely reduced.

Recently, an additional improvement in the anode casting efficiency has been called for. In order to increase the casting efficiency, for example, from a conventional 80 t / h to 120 t / h, it is necessary to accelerate the pouring from the spacer to the weighing bucket. When the melt is poured into the weighing bucket at high speed, the droplets of the melt Rois-10 are very nice and the scabs form considerably on the sides of the weighing bucket.

It is impossible to remove casting scabs from the side walls with the device proposed in patent 1.

The method proposed in Patent Publication 2 does not seek to remove the cast-15 but facilitates the repair of a weighing bucket.

Also, patent publication 3 does not provide a solution to the problems described above. Here, molten metal is deposited on the throttle element and narrows the interior of the trough. This also reduces the weighing accuracy.

Therefore, it is an object of the present invention to provide a 20 scoop which does not require the temporary stopping of the casting operation to remove casting scabs from the side walls. Removal of casting scabs on the lancet cannot be done properly.

It is therefore an object of the present invention to propose a weighing scoop for pouring a melt into a mold which can eliminate the above disadvantages and the need to interrupt casting operation due to the growth of casting scars and which can significantly reduce the elimination of casting defects by the burner. A weighing bucket for measuring and pouring a predetermined amount of melt into a mold by tilting the bucket about an axis of rotation, the bucket comprising: ° 30 a recess having a depth for storing said predetermined amount of melt poured into it and a width greater than that poured into the recess splatter-away; for pouring the drain spout melt into the mold, o between the spout recess and the drain spout which is the lower

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§ in the direction of the discharge spout and positioned downstream of the recess axis

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35. Since the spilled metal does not precipitate on the sides of the weighing scoops, no scabs are formed.

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When the melt is poured from the spacer into the recess of the weighing bucket of the present invention, the melt collides into the recess and the splashed metal droplets fall into the recess. Splashed metal does not adhere to the sides of the weighing scoop. Although some spattered metal will adhere, the distance 5 mentioned above is so large that the growth of scabs at the edges of the side walls is suppressed.

When the melt pool is shallow, the melt poured into the metal pool or the bottom of the cavity can spill widely. Preferably, at least one-third of the melt stored in the cavity as large as the effective depth of the cavity should not be poured into the anode casting so that when the melt 10 is subsequently poured from the spacer into the weighing bucket, spattering is significantly reduced. Splashing is less when the melt not poured into the well is larger. However, the unmelted melt is preferably at most half the depth of the recess.

The pouring gutter directs the melt towards the spout and then to the mold. 15 Thus, if the pouring gutter is extended as a recess, the melt will flow over a wider area than hitherto and may splash with the mold. Thus, the trough cannot be widened. In addition, since melt droplets splashing into the recess are unlikely to enter the pour gutter, the pour gutter should be widened to collect spillage melt spills by its expansion. The weighing scoop is therefore from above generally Chinese-20 with its mark £? shaped.

Because casting scabs can form on the slag stop, its location has been moved toward the drain nipple.

There is a partition structure between the recess and the trough due to the difference in width between them. If such partitions are perpendicular to the walls of the recess and the pouring gutter, when the melt is flowing along the walls of the recess in the direction of the drain nozzle, the melt changes the direction of flow perpendicularly along the partitions. At a 90 ° change of direction, the melt can get stuck in the partitions. According to yet another embodiment of the present invention, the partitions are V inclined with respect to the longitudinal axis of the weighing scoop. In this embodiment, the sun in 30 latex flows smoothly along the partitions.

| According to the weighing bucket of the present invention, the melt flowing at the bottom of the cavity o or stored in the cavity melt pool only spills.

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g in the recess area. Therefore, the spattered metal does not precipitate on the side walls and the slag stop. Therefore, it is not necessary to remove the casting scabs on the lancet and interrupt the casting operation to remove the castings. The loss of casting efficiency due to the functional interruption can therefore be prevented.

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Brief Description of the Drawings

Figure 1 (a) is a top view of a weighing bucket according to an embodiment of the present invention.

Figure 1 (b) is a cross-sectional view of the weighing bucket shown in Figure 1 (a).

Figure 2 is a top view schematically showing a conventional anode casting device.

Figure 3 is a top view of a mold for casting an anode.

Figure 4 is a top view of a conventional weighing bucket for casting an anode.

Fig. 5 (a) is a side view of a weighing scoop with casting scabs.

Figure 5 (b) is a top view of a weighing bucket with casting scabs.

Description of Preferred Embodiments

Referring to Figure 1 (a), a weighing bucket for casting an anode according to a preferred embodiment of the present invention is shown. Referring to Fig. 15 1 (b) is a cross-sectional view of Fig. 1 (a). In these drawings, the same parts as in Figures 4 (a) and (b) are shown with the same reference numerals.

The recess 11 has an effective depth (De) capable of storing a predetermined amount of melt. The trough 13 is adjacent to the recess 11. The melt is poured from the non-shown spacer into the recess 20, which is wider than the pouring trough 13. The weighing bucket 10 for pouring the melt into the anode is generally of the Chinese character Ö. The melt is poured into the weighing bucket (not shown) into the weighing bucket and collides with the well 11a 11a. The melt droplets splash at position 11a, which is essentially the center of the weighing bucket when viewed in width. The width of the recess 11le-25, i.e. the distance of each of said walls 10a, is greater than that of the metal droplet.

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5 spacing of ribs from impact point 11a. Preferably, the recess 11 has a width ≤ 1.5-1.7 times the width of the pouring spout 13. More specifically, the recess 11 is about 150 mm wider per side than the pouring gutter 13. Thus, the LT) o spattering droplets of metal fall into the recess 11.

| The partitions are formed between recess 11 and pouring gutter 13 with different widths of recess and pouring gutter. The partitions are implemented

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g as sloping walls, designated by reference numeral 17. As a result, the melt does not get stuck, but flows smoothly along the sloping partitions. The angle of the sloping walls 17 is not limited, but is preferably 10 ° in the embodiment shown in Figure 1 (a). Partitions may be implemented as curved walls, provided that the melt does not get stuck in bends.

The pouring gutter 13 is the part of the weighing bucket where the melt previously stored in the recess 11 flows downstream during the casting. In addition, the depth of the pouring gutter 13 5 becomes progressively shallower in the direction of the gutter 13a.

The slag stop 15 is formed across the side walls 10a and at a position downstream of the rotating shaft 21. Splashing melt droplets do not reach such a location and thus do not form casting scabs.

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Claims (2)

A weighing bucket for measuring and pouring a predetermined amount of melt into a mold by tilting the bucket about an axis of rotation which the bucket comprises: a recess (11) having a depth for storing said predetermined amount of melt poured into it and a width greater than that poured into the recess. splash distance and 1.5 to 1.7 times the width of the pouring run (13); for pouring the melting spout (13a) into the mold, between the pouring run (13) between the recess (11) and the outlet spout (13a), which is lower 10 towards the outlet spout (13a) and located downstream of the recess (11) with respect to the axis (21) ; and, if necessary, a slag stop (15) that prevents foreign material flowing through the melting pool from flowing into the mold is disposed at a position in the pouring gutter (13) spaced from the splash area of the melt droplets and does not obstruct the flow of melt. Weighing bucket according to claim 1, characterized in that the partitions (17) between the recess (11) and the pouring gutter (13) are inclined with respect to the longitudinal central axis of the weighing bucket (10). o δ {M i tn o X cc CL O LO {M O CO O O CM 1. Powered by För att rotten och halla upp en förut bestämd play smälta i en form genom att luta skopan runt en roterande Axel, wow skopa omfattar: en fördjupning (11) med et djup för att lagra förut bestämda 5 games smälta som hällts och en bredd, som är större än den i fördjup-ningen hällda smältans stänkavständ och 1,5-1,7 ganger större än en Häll-ningsrännas (13) bredd; en utloppspip (13a) för att halla smältan i formen, en hällningsränna (13) mellan fördjupningen (11) och utloppspipen (13a), wandering over the utloppspipens (13a) riktning och placerad nedströms fran 10 fördjning den roterande axeln (21); och vid behov and en-stop mechanism (15) för slagg, som hindrar främmande ämnen som ström-mar i en smältbassäng frän att strömma account formen, placerad on i Häll-ningsrännan (13), som från avständ fran smältdropparnas stänkomrade, och som inte hindrar smältans strömning. 15 The Vägskopa enligt patentkrav 1, kännetecknad av att mellanväggarna (17) mellan fördjupningen (11) och hällningsrännan (13) is provided to the förhällande account vägskopans (10) längsgäende measuresxel. o δ {M i tn o X cc CL o m {M o CD o o {M