JPH0349784Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for applying a mold release agent to a mold for casting an anode for electrolytic refining in the refining of non-ferrous metals such as copper and lead.

[Conventional technology]

To electrolytically refine nonferrous metals, the crude metal is used as a flat anode, and the flat cathode and the electrolytic tank are placed at alternating intervals, electrolyzed, and electrodeposited on the cathode for refining. are generally cast by pouring crude metal into the recesses of a horizontal mold. During this casting process, in order to prevent the mold and cast metal from seizing, a water-insoluble powder mold release agent such as clay powder, bone ash powder, or silica sand powder is applied as a slurry dispersed in water. ing.

If this mold release agent is applied in the form of a powder, it is not only difficult to spread it evenly over the mold surface, but it also scatters as smoke and pollutes the surrounding area, but by applying it as a slurry, It is applied as a slurry because it can be applied uniformly and in a short time without contaminating the surrounding area. For this application, it is convenient to apply a predetermined amount of liquid per mold, and the release agent is contained in a predetermined amount in this predetermined amount of slurry. If the concentration of the mold release agent in this slurry is not properly adjusted, the peelability of the cast anode from the mold may be different, or the mold release agent may be caught in the cast anode, resulting in poor quality of the anode. If it deteriorates, abnormal protrusions may form on the surface of the anode, which may come into contact with the cathode during electrolysis and cause shoots. Problems such as a reduction in the life of the mold arise.

This mold release agent is a powder that is insoluble in water, so even if you try to measure this slurry with a floating scale, the mold release agent will settle when the slurry is stationary and cannot be measured. The scale moves up and down, making it impossible to read the scale accurately. The method of measuring specific gravity by collecting a certain amount of slurry in a pycnometer is time-consuming and complicated, and cannot be applied at work sites.

Therefore, in the past, based on many years of experience, workers judged the concentration of the mold release agent in the slurry based on the density of the slurry sprinkled on the mold surface, and adjusted the amount of water or mold release agent mixed. . However, visual adjustment may vary due to individual differences, and the amount of casting at one time is 300.
It was not possible to suppress fluctuations in the concentration of the mold release agent while casting up to 400 tons of crude metal into a mold over several hours.

[The problem that the invention attempts to solve]

The object of the present invention is to provide an apparatus for applying a release agent slurry to a casting mold, which can automatically keep the concentration of the release agent in the slurry almost uniform and spray it without manual intervention. .

[Means for solving problems]

The means according to the present invention includes a stirring tank, a spraying nozzle connected to the stirring tank via a spraying pump that is constantly operated, and a passageway to the spraying nozzle provided between the spraying nozzle and the spraying pump. A solenoid valve is installed to open periodically for a predetermined period of time, a return pipe is branched from between the solenoid valve and the spraying pump and led to the top of the stirring tank, and a part of the return pipe is branched to stir the water. A bypass pipe that opens above the liquid level of the tank, a funnel-shaped detection bottle that is placed at the top of the stirring tank so that the opening of the bypass pipe is located at the top of the inner surface, and one of the light source section or the light receiving section is placed inside the detection bottle. A mold release agent equipped with a light transmission type densitometer inserted and arranged, and a water supply pump to a stirring tank or a powder supply device to the stirring tank, which is provided so as to be controlled by the light transmission type densitometer. Located in slurry coating equipment.

〔Example〕

FIG. 1 and FIG. 2 show an embodiment of the present device.

In Fig. 1, 2 is a primary stirring tank, in which powder is supplied from a powder supply device 1 that supplies mold release agent powder such as clay, water is supplied from a water supply pump 10 to the primary stirring tank 2, and it is blown out from the bottom. It is designed to be stirred by air bubbles. The slurry 13 made in the primary stirring tank 2 is supplied to the secondary stirring tank 3, and is stirred by a stirring blade provided in the secondary stirring tank 3. The secondary stirring tank 3 is connected to a spraying nozzle 11 via a spraying pump 4 that is constantly operated. Below the spraying nozzle 11, molds 12 placed on a turntable are intermittently carried and stopped one by one by the turntable.

A solenoid valve 15 is provided between the spraying pump 4 and the spraying nozzle 11 so that the slurry 13 is sprayed for a predetermined time while the mold 12 is stopped under the spraying nozzle 11. The solenoid valve 15 is operated by a control device that is not installed.

A return pipe 5 is branched between the electromagnetic valve 15 and the dispersion pump 4, and the other end of the return pipe 5 opens into the upper part of the secondary stirring tank 3. The return pipe 5 is provided with a bypass pipe 5' that branches off from a part of the return pipe and opens above the liquid level of the secondary stirring tank 3. Secondary stirring tank 3
A funnel-shaped detection bottle 6 made of transparent glass is arranged above the liquid level so that the opening of the bypass pipe 5' is located at the upper part of the inner surface.

A light source section 7 of a light transmission type densitometer 9 is inserted into the detection bottle 6 , and a light receiving section 8 facing the light source section 7 is arranged outside the detection bottle 6 . The light source section 7 and the light receiving section 8 are coupled with each other at a constant distance so that the light from the light source section 7 is focused on the light receiving section 8. The light source section 7 inside the detection bottle 6 is supported by a suitable support so that it can be moved closer to or away from the side wall of the detection bottle 6.

A light transmission type densitometer 9 is provided so that the amount of water supplied by the water supply pump 10 can be adjusted.

The openings of the return pipe 5 and the bypass pipe 5' to the secondary stirring tank 3 and the detection bottle 6 are connected to the spray nozzle 1.
installed at a water level higher than 1.

If the amount of slurry delivered by the spraying pump 4 is less than the amount that can be discharged from the spraying nozzle 11, the slurry 13 will not be circulated to the return pipe 5 while the slurry 13 is being sprayed from the spraying nozzle 11, and the slurry 13 will not be circulated to the return pipe 5. The size of the funnel-shaped outlet of the detection bottle 6 is adjusted so that the slurry 13 returned by the return pipe 5 does not completely come out of the detection bottle 6 while the slurry 13 is not being sprayed from the detection bottle 11. . The light emitting portion of the light source section 7 in the detection bottle 6 is kept immersed in the slurry 13 at all times. The slurry 13 is circulated to the return pipe 5 even while the slurry 13 is being sprayed from the spraying nozzle 11 than when the amount of slurry delivered by the spraying pump 4 is larger than the amount that can be discharged from the spraying nozzle 11. The discharge amount from the funnel-shaped outlet of the detection bottle 6 is also increased in the above case. This adjustment can be easily done by providing a socket at the outlet.

The light receiving section 8 may be placed inside the detection bottle 6 and the light source section 7 may be placed outside the detection bottle 6. Light transmission type densitometer 9
Instead of controlling the water supply pump 10, the powder supply device 1 may be controlled.

[Effect]

In this device, a part of the slurry supplied to the spraying nozzle is circulated while the device is in use, and the concentration can be measured while the slurry is flowing, so that the slurry is actually being sprayed onto the mold. The concentration of the slurry can be ascertained, and the slurry concentration can be adjusted based on this information.In addition, the measurement section is installed in a separate detection bottle rather than in a large volume such as a stirring tank, and this is used as a detection section. By immersing either the light source section or the light receiving section,
The measurement sensitivity can be adjusted according to the concentration of the slurry by adjusting the distance between the side wall of the detection bottle and the light source or light receiving part inside the bottle, and the volume of the detection bottle can be made small to transfer the slurry to the mold. It is being dispersed,
When the amount of slurry supplied to the detection bottle is small or absent, clean water can be supplied to the detection bottle to clean the detection bottle and the detection part, which prevents the detection function from deteriorating due to dirt while using the device. , it is possible to suppress fluctuations in the concentration of slurry sprayed onto the mold during the entire long casting period.

By fixing the light source and the light receiving part relatively so that the light receiving part is always focused, even when the slurry concentration is high, the distance between the light source part or the light receiving part in the detection bottle and the side wall of the detection bottle can be fixed. Measurement sensitivity can be easily adjusted by narrowing the range.

Using the apparatus shown in the drawing, mix a viscous powder as a mold release agent at 1 part by weight with 60 parts by weight of water to make a slurry, and sprinkle 4 on each mold for 5 seconds. Spraying was then continued at intervals of 19 seconds. At this time, the slurry delivery rate of the dispersion pump 4 was set at 50 per minute. and about
The slurry was sampled into a pycnometer at 30 minute intervals and its concentration was measured. The results are shown in Figure 3. Also, without using the above equipment, the slurry material concentration is the same,
FIG. 4 shows the results when the density was adjusted visually by a person. Figure 4: ±0.4 when adjusted visually by a person
% fluctuation occurred, but when the present device was used, it was possible to equalize the fluctuation range to ±0.2%. FIG. 5 shows the life of the molds (144 molds in total) in the case of FIG. 3, that is, the frequency distribution of the number of anodes cast per mold. Further, FIG. 6 shows the same frequency distribution as FIG. 5 in the case of FIG. 4. As described above, the average number of anodes cast per mold was approximately 1,900 in the past, whereas when the present device was used, the average number of anodes cast per mold was 2,300, an improvement of about 20%.

[Effect of idea]

According to the proposed device, the concentration of slurry containing water-insoluble mold release agent powder, which tends to settle, can be automatically maintained and dispersed almost uniformly during casting, resulting in good casting material and extending the life of the mold. It is possible to provide an apparatus for applying mold release agent slurry to a casting mold that can extend the time.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of one embodiment of the proposed device, Fig. 2 is a partially enlarged explanatory diagram of Fig. 1, and Fig. 3 is a variation in the concentration of the sprayed slurry when slurry is spread using the proposed device. Figure 4 is a diagram showing the state of change in slurry concentration when the slurry concentration is manually adjusted in the past, Figure 5 is a diagram showing the mold life in the case of Figure 3, and Figure 6 is a diagram showing the state. is a diagram showing the mold life in the case of FIG. 4. 1... Powder supply device, 2... Primary stirring tank, 3...
... Secondary stirring tank, 4 ... Spraying pump, 5 ... Return pipe, 5' ... Bypass pipe, 6 ... Detection bottle,
7... Light source part, 8... Light receiving part, 9... Light transmission type densitometer, 10... Water supply pump, 11... Spraying nozzle, 12... Mold, 13... Slurry, 14...
Transmitted light, 15...Solenoid valve.

Claims (1)

[Scope of utility model registration request] A stirring tank, a spraying nozzle connected to the stirring tank via a spraying pump that is constantly operated, and a passage to the spraying nozzle provided between the spraying nozzle and the spraying pump periodically for a predetermined period of time. A solenoid valve is installed to open to the top, a return pipe is branched from between the solenoid valve and the spraying pump and led to the top of the stirring tank, and a return pipe is branched from a part of the return pipe and led to the top of the stirring tank. An open bypass pipe, a funnel-shaped detection bottle placed at the top of the stirring tank so that the opening of the bypass pipe is located at the top of the inner surface, and one of the light source part or the light receiving part inserted into the detection bottle. A mold release agent slurry for a casting mold equipped with a light transmission type densitometer and a water supply pump to a stirring tank or a powder supply device to the stirring tank provided to be controlled by the light transmission type densitometer. coating equipment.