JP3769798B2 - Rotating casting machine for copper smelting and copper anode forming method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a copper anode rotary casting in which crude copper produced in a copper smelting process is cast and supplied as an anode to the subsequent electrolytic purification process. Specifically, the swelling of the copper anode is detected by measuring the surface temperature distribution. The present invention relates to a copper anode rotary casting.
[0002]
[Prior art]
As shown in FIG. 1, the copper anode rotary casting machine typically includes a turntable 1, a plurality of molds 2 placed on the turntable 1, a weighing rod 4, a cooling hood 8, The cooling water spray pipe 9, the irregular anode stripping device 10, the normal anode stripping device 13, and the clay water spraying device 14, and the anode 3 cast into the mold 2 from the measuring rod 4 is indicated by the arrow A It is configured to perform cooling and stripping sequentially while moving in the direction.
During the operation of the copper anode rotary casting machine, molten copper obtained by refining the crude copper produced from the converter in the refining furnace 7 is weighed in a certain amount through a sink 6 and a basin 5. 4, and a predetermined amount of molten refined crude copper is poured into the mold 2 from the measuring rod 4.
[0003]
The cooling hood 8 has a cooling water spray pipe 9 therein, whereby the cooling water is sprayed, and the anode 3 and the mold 2 after casting are cooled.
The deformed anode stripping apparatus 10 strips defective products in appearance, that is, defective anodes that are generated due to poorly spread molten metal on the shoulder portion, or deformed anodes that are cast in a mold having a different shape. In the normal anode stripping device 13, the remaining anode 3 is stripped from the mold 2.
In the clay water spraying device 14, clay water is sprayed on the surface of the mold 2 as a release agent for performing the next casting.
The copper anode rotary casting machine configured as described above is operated, controlled, and monitored by an operator in a driver's cab (not shown) arranged at or near the center thereof.
[0004]
As described above, in casting the copper anode, spraying of clay water is performed in order to improve the peelability between the anode 3 and the mold 2, and this clay water spraying has functions such as cooling and protection of the mold 2. There is also. In order to cool the mold 2, it is preferable that the amount of clay water sprayed is large, and in order to protect the mold 2, it is preferable that the clay concentration of clay water is high.
However, if the amount of clay water sprayed is too large, the mold cooling water and the clay water will not evaporate well due to the supercooling of the mold, and the water remaining on the mold will evaporate during molten crude copper pouring. As shown in FIG. 3, voids or swollen portions 3a are formed inside the anode, and defective anodes having a swollen surface are generated (hereinafter, these defective anodes are referred to as swollen anodes).
[0005]
On the other hand, when the concentration of clay water is too high, that is, when the amount of spread clay is excessive, the evaporation of moisture on the mold surface is carried out well, but there is a large amount of crystal water in the clay, and the molten crude copper As the crystal water evaporates during pouring, a swollen anode as shown in FIGS. 2 and 3 is similarly generated. When these swollen anodes are treated in the subsequent electrolytic purification process, the following problems arise.
That is, when the anode is swollen in the electrolytic purification process, the anode 3 and the cathode 20 are removed by peeling or peeling of the surface of the swollen portion 3a as shown in FIG. 4 in the process of dissolving the anode 3 during electrolysis. A short circuit will cause adverse effects on operations such as quality deterioration due to voltage drop. Further, when the dissolution progresses and the internal voids are exposed, the surface of the anode 3 becomes non-uniform, so that the electrodeposition of the cathode 20 is not made uniform, and electrolytic copper with poor surface properties is generated.
Therefore, in the copper anode casting process, when it comes out from the outlet of the cooling hood 8, the operator determines the swollen anode by visual inspection, and the swollen anode is inspected by the deformed anode stripping device 10 before being sent to the electrolytic purification process. Extracted as a good product.
[0006]
[Problems to be solved by the invention]
However, the degree of swelling of the anode varies, and there is a difference in the operator's judgment criteria, and it is virtually impossible to visually check each anode that moves one after another in the casting process. For example, it is difficult to quantitatively grasp the amount of the swollen anode generated. For this reason, the swollen anode is mixed in the anode 3 carried out from the normal anode stripping device 13. It is impossible to remove defective products from the anode carried out from the normal anode stripping device 13 due to the efficiency of product transportation and storage. Also, if the swollen anode is not detected promptly, feedback measures such as changing the spraying amount and concentration of clay water will be delayed, so that a large amount of swollen anode will not be extracted as a defective anode and sent to the electrolysis process. There is a problem that it will be.
[0007]
Therefore, the present invention automates the detection of the swollen anode, thereby saving labor of the operator's visual check, standardizing the criteria for the swollen anode, and quantitatively grasping the swollen anode amount. On the other hand, it is an object of the present invention to provide a copper refining casting machine or a copper anode forming method capable of quickly responding.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present inventor has investigated the temperature distribution of the anode immediately after water spray cooling, and as a result, the surface temperature of the void portion or the swollen portion of the swollen anode is lower than the surrounding anode surface temperature. I found out and focused on this. That is, according to the copper anode forming method of the present invention, when the anode from the cooling device of the copper anode rotary casting machine is cooled to a certain temperature, the surface temperature distribution is measured, and the swollen portion of the anode is detected by the temperature difference. There is a feature in doing.
Therefore, the copper kneading rotary casting machine of the present invention is characterized in that a thermometer for measuring the surface temperature distribution of the anode existing between the cooling device and the anode stripping device of the copper anode rotary casting machine is installed. . This thermometer is preferably a non-contact type.
Further, the present invention is characterized in that a device for determining the presence or absence of a void portion in the anode based on the surface temperature distribution is provided.
[0009]
The determination of the presence or absence of a void portion is performed as follows.
FIG. 6 shows the anode 3 having a good surface property with no swollen portion, and FIGS. 7 and 8 show the surface temperature distribution of the anode 3, with the center being the highest and the temperature going toward the edge. The distribution is going down.
FIG. 9 shows the surface temperature distribution when the anode 3 has the swollen portion 3a as shown in FIG. 2, and it can be seen that the temperature of the swollen portion is lower than the surroundings. Although there is not much temperature change at the center of the swollen part, the temperature of the edge of the swollen part suddenly decreases toward the center of the swollen part, and this large part of the temperature change can be detected as the swollen part. it can.
[0010]
When foreign matter such as casting scraps is placed on the anode, there is a region where the temperature distribution is recessed at the center. However, in the case of foreign matter, the temperature of the central portion of this region is greatly reduced compared to the central portion of the bulge, and from this difference in the absolute temperature of the central portion, it is possible to distinguish the bulging portion 3a from the foreign matter, Both the detection rate and the correct answer rate of the swollen portion 3a of the anode 3 can be increased.
Therefore, the presence or absence of a void portion can be determined by reading a curve indicating the surface temperature distribution and identifying its shape.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the copper anode rotary casting machine of this embodiment includes a turntable 1, a plurality of molds 2 placed on the turntable 1, a weighing rod 4, a cooling hood 8, The anode 3 cast from the measuring rod 4 is composed of a cooling water spraying pipe 9, a modified anode stripping device 10, a non-contact type thermometer 11, a normal anode stripping device 13, and a clay water spraying device 14. Is moved in the direction of arrow A, and cooling and stripping are sequentially performed.
During the operation of the copper anode rotary casting machine, molten copper obtained by refining the crude copper produced from the converter in the refining furnace 7 is weighed in a certain amount through a sink 6 and a basin 5. 4, from which a certain amount of melt-refined crude copper is poured into the mold 2.
The cooling hood 8 has a cooling water spray pipe 9 therein, from which cooling water is sprayed, and the anode and the mold after casting are cooled.
[0012]
The deformed anode stripping apparatus 10 visually determines a defective product caused by an appearance defect, that is, a defective anode that has not been satisfactorily spread over the shoulder portion, and issues a command to the stripper to strip it. In addition, the deformed anode cast into a mold having a different shape from that of a normal one is detected by a detector and the stripper is automatically operated.
In the normal anode stripping device 13, the shoulder portions of all moving anodes 3 are hooked by a lift (not shown) and are automatically stripped from the mold 2.
In the clay water spraying device 14, clay water is sprayed on the surface of the mold 2 as a release agent for performing the next casting. A device for adjusting the concentration of the clay water is provided in the clay water spraying device 14.
[0013]
A non-contact thermometer 11 (for example, an infrared radiation thermometer manufactured by NEC Sanei Co., Ltd.) is installed at a position between the deformed anode stripping device 10 and the normal anode stripping device 13. As shown in FIG. 5, the non-contact thermometer 11 is connected to the arithmetic processing device 12 in the cab 15. The non-contact type thermometer 11 is fixed to a fixed base so that the anode 3 can be scanned according to the x-axis and y-axis coordinates by an internal motor, and the entire surface is scanned as the anode 3 moves. To do. The temperature data sensed by this scanning is sent to the arithmetic processing unit 12 (YEWMAC manufactured by Yokogawa Electric Corporation) and processed by the computer 16 . FIG. 10 shows a flowchart of processing for detecting a gap (swelling) by the arithmetic processing unit 12.
[0014]
(1) In the raw data from the filtering non-contact type thermometer 11, the influence of the surface state or the like becomes noise in terms of processing. Therefore, by filtering the surface temperature, only the portion where the surface temperature is smoothed and points with large temperature changes are collected can be taken out.
[0015]
(2) Extracting most of the temperature change (extraction)
After filtering, a portion having a large temperature change amount is extracted by binarization processing.
[0016]
(3) Grouping (grouping) of temperature change amount
Group parts that are close to each other in the part where the temperature change is large. A reference point is determined for each group, a point having a large change amount is found in the analysis direction from the reference point, and if the point is close, it is regarded as the same group and counted as a group dot.
[0017]
(4) Regarding the determination of blistering, when the number of dots in each group, which is grouped, is larger than the reference value, it is determined to be abnormal. For the abnormal group, the center coordinate is obtained, the temperature of the center coordinate is read, if the temperature is extremely low, it is determined as slab, and the other is determined as swelling. The arithmetic processing unit 12 draws a graph of the surface temperature distribution by the processing of the computer 16 and determines the presence or absence of a void portion based on the shape change of the graph. In addition, it can also judge visually based on the drawn chart.
[0018]
When the presence of the void portion (swelling) is determined, a correction signal is sent to the clay water spraying device 14. Based on this, the amount and concentration of clay water are corrected by the adjusting device in the clay water sprinkler 14. This is to prevent the occurrence of voids (blowing) in the subsequent anode. It is desirable to send a removal signal to the normal anode stripping device 13 and remove it from the row of normal anodes in the anode stripping device 13.
The temperature of the anode 3 coming out of the cooling hood 8 is 650 to 750 ° C., and 600 to 700 ° C. in the normal anode stripping device 13.
Thereafter, the anode 3 is taken out from the casting machine and air-cooled to room temperature before being taken out.
[0019]
In the process of this embodiment, the surface temperature is measured by the non-contact type thermometer 11, but the surface temperature is accurately measured by the steam from the cooling hood 8 on the cooling hood 8 side from the deformed anode stripping device 10. Therefore, the surface temperature of the anode 3 between the deformed anode stripping device 10 and the normal anode stripping device 13 is measured. However, if measures against steam in the cooling hood 8 are properly performed, there will be no effect on the measurement of the surface temperature, so the cab 15 is opened from the non-contact type thermometer 11 from the side of the cooling hood 8 from the modified anode stripping device 10. It is preferable to send a command to the deformed anode stripping device 10 to remove the swollen anode by the deformed anode stripping device 10. An example of this is shown in FIG.
[0020]
【The invention's effect】
The present invention enables automatic detection of a swollen anode, which enables labor saving of operator's visual check, standardization of blister anode criteria, and quantitative evaluation of swollen anodes, and enables rapid detection in the casting process. It became possible to take correspondence.
Furthermore, by installing a non-contact type thermometer at the outlet of the cooling hood and linking it with the irregular anode stripping device and clay water spraying system, the spraying amount and concentration of clay water are automatically detected based on the degree of anode swelling detection. Adjustment is possible.
In addition, the swollen anode generated during the time lag of the adjustment stage can be automatically stripped by the deformed anode stripping device, which leads to improvement in operation efficiency of the casting process and the electrolytic purification process.
[Brief description of the drawings]
FIG. 1 is a plan view showing a copper anode rotary casting machine embodying the present invention.
FIG. 2 is a front view showing an anode in which swelling has occurred.
FIG. 3 is a side view showing an anode in which swelling has occurred.
FIG. 4 is a side view showing a state in which an anode swell is peeled off and an anode and a cathode are short-circuited in an electrolytic purification process.
FIG. 5 is a diagram showing a relationship between a non-contact type thermometer and an arithmetic processing unit.
FIG. 6 is a front view showing the anode in a normal state.
FIG. 7 is a diagram showing a surface temperature distribution of an anode.
FIG. 8 is a diagram showing the surface temperature distribution of the anode.
FIG. 9 is a diagram showing the surface temperature distribution of the anode.
FIG. 10 is a flowchart showing a process for determining a void portion (swelling).
FIG. 11 is a layout view similar to FIG. 1 showing another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Turntable 2 Mold 3 Anode 4 Weighing basket 6 Flowing bowl 7 Refinement furnace 8 Cooling hood 10 Deformed anode stripping device 11 Non-contact type thermometer 12 Processing unit 13 Anode stripping device
16 Computer 19 Clay water spraying device

Claims (2)

A mold for forming molten refined crude copper discharged from the copper refining furnace on the anode for copper electrolysis, a pouring equipment for injecting the melted refined crude copper into the mold, an apparatus for moving the mold, and in the mold An apparatus for cooling the molded anode and a stripping device for stripping the anode from the mold , and for measuring the surface temperature distribution of the anode existing between the cooling device and the anode stripping device In the method of forming an anode from a rotary smelting machine for copper smelting having a thermometer and a determination device for detecting a void in the anode from the surface temperature distribution, the surface temperature distribution of the anode from the cooling device is measured. A method for forming a copper anode, characterized by recognizing a portion where the temperature is lower than the surroundings and detecting a void in the anode.   A mold for forming molten refined crude copper discharged from the copper refining furnace on the anode for copper electrolysis, a pouring equipment for injecting the melted refined crude copper into the mold, an apparatus for moving the mold, A copper smelting rotary casting machine comprising a device for cooling a molded anode and a stripping device for stripping the anode from a mold, the anode existing between the cooling device and the anode stripping device A rotary smelting machine for copper smelting, comprising: a thermometer for measuring the surface temperature distribution of the copper, and a determination device for detecting a void in the anode based on the surface temperature distribution.

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