JP2649987B2 - Method and apparatus for casting anode for copper electrolysis - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for pouring molten copper into a mold to cast an anode for copper electrolysis. The present invention relates to a method and an apparatus for casting an anode for copper electrolysis that can prevent the occurrence of casting.

2. Description of the Related Art As a method of casting an anode for copper electrolysis, as shown in FIG. 3, a Walker method of pouring molten copper into a horizontally arranged mold M is widely used.

That is, in the conventional anode mold M, for example, pouring purified crude copper having a copper grade of about 99.3% from a refining furnace, which is the final stage of the melting process, into a mold having a predetermined shape formed of cast steel or the like. The shape of the base 1 is generally the same as that of the anode. The base 1 surrounds the outer periphery of the base 1, and has a predetermined height (t) from the upper surface 1a of the base 1. Edge 2 projecting upward only. That is,
The anode mold M includes an upper surface 1a of the base 1 and an upper surface of the base.
A concave portion S defined by the inner peripheral surface 2a of the edge portion 2 of a portion projecting upward from 1a, and molten copper made of purified blister copper is poured into the concave portion S for copper electrolysis. An anode A is formed.

However, when horizontal casting is performed using the mold M in accordance with the above-mentioned Walker method, when the molten copper is poured into the mold, the cast anode A is provided as shown in FIG. Then, a casting was formed on the upper outer peripheral edge a of the anode A corresponding to the interface between the mold M and the molten metal. It is very difficult to prevent such casting.

In addition, the casting of the anode causes troubles in the anode aligning machine such as obstructing insertion of a seed plate (cathode) during copper refining, and causes a short circuit at the time of electrolysis due to contact with another anode. This is a cause of efficiency deterioration.

Conventionally, as a method for solving such a problem, a melt temperature, a pouring temperature, a casting temperature, a mold temperature, a cooling water amount, and the like are adjusted. It is difficult at present, and the technology for preventing casting has not yet been established.

Accordingly, an object of the present invention is to provide a method and apparatus for casting an anode for copper electrolysis, which does not cause a trouble in an anode aligning machine during copper refining or a cast-off which causes a short circuit at the time of electrolysis and deteriorates current efficiency. To provide.

Means for Solving the Problems The above object is achieved by a method and an apparatus for casting an anode for copper electrolysis according to the present invention. In summary, the present invention provides a method for casting an anode for copper electrolysis by pouring molten copper into a mold, and before pouring the molten copper into the mold, the flash point is 190 ° C. to 2 ° C.
30 ° C, 50mSt or less of oil with kinematic viscosity 50mSt around the inside of the mold
This is a casting method for an anode for copper electrolysis, wherein casting is prevented by applying at a rate of l / m ^{2 to} 150 ml / m ² . Rapeseed oil or turbine oil is preferably used as the oil agent.

The method of the present invention comprises: a mold conveying means for holding the mold in a horizontal state and conveying the mold along a predetermined conveying path; and an oil agent provided above the mold conveying means and across the conveying path of the mold. An application device, wherein the oil application device controls a plurality of application nozzles, an oil agent supply pipe that supplies an oil agent from an oil agent supply source to each application nozzle, and a supply stop of the oil agent to each application nozzle. The present invention is suitably implemented in a casting apparatus for an anode for copper electrolysis having a controller.

To further explain, the present inventors, in the course of research to improve the problems of the casting method of copper electrolysis anode according to the Walker method, prior to pouring molten copper into the mold, the flash point was 190 An oil agent in a temperature range of from about 200 ° C. to about 230 ° C. is applied to the inner peripheral surface of the mold, that is, the inner peripheral surface of the edge portion 2 of the portion protruding above the base upper surface 1a of the mold M in FIG.
It was found that casting could be suppressed by coating on 2a.

That is, the flash point applied to the inner peripheral surface 2a of the mold M is
When the molten copper is poured into the mold M, the oil agent in the range of 190 ° C to 230 ° C decomposes and carbonizes due to the heat of the molten copper. It is considered that this carbide adheres to the inner peripheral surface 2a of the mold M and acts as a release agent, thereby preventing the occurrence of casting.

If the flash point of the oil agent is less than 190 ° C, the burning speed of the oil agent is high, the oil agent is completely burned, and there is no or little if any carbide. It does not function as. The flash point of oil is 230 ℃
When the temperature exceeds the above range, there is a problem that the burning speed of the oil agent is slow and the oil agent is not sufficiently decomposed, the oil component remains, and the casting surface becomes rough in an uneven shape.

Also, the oil agent is required to be uniformly applied to the mold,
From this point, viscosity characteristics are also important. According to the present invention, the kinematic viscosity of the oil agent is optimally 50 cSt or less. Kinematic viscosity is 50cSt
Since the oil agent exceeding the above is difficult to apply to the mold by a spray gun, it is applied by a brush, so that uniform application cannot be performed and the casting surface becomes rough.

Furthermore, oil is required to be applied in a range of 50ml / m ² ~150ml / m ² to a mold M, the coating amount is too small when the coating amount is less than 50 ml / m ^2, its effect I can't get it.
On the other hand, if the coating amount is more than 150 ml / m ² , the coating amount is too large, and the casting surface becomes rough in irregularities, which is not preferable.

As described above, it is important that the oil agent is applied to the mold M only on the portion corresponding to the outer peripheral portion of the anode A, that is, on the inner peripheral surface 2a of the mold M.
If the oil agent is applied to the entire inner surface of the mold, the combustion of the oil agent becomes incomplete, an oil component remains, and the cast surface of the anode A due to the residual oil becomes uneven, which is not preferable.

Examples Next, the present invention will be further described based on examples.

FIG. 1 schematically shows an embodiment of a casting apparatus for carrying out a method for casting an anode for copper electrolysis according to the present invention.

The casting apparatus according to the present embodiment includes a mold conveying means 100 that holds the mold M in a horizontal state and conveys the mold M along a conveying path that is a straight path or a predetermined curved path.
Above the feed path of the mold M, and
Is provided.

The oil applying device 50 includes a plurality of application nozzles 51 (51a to 51a).
h), and an oil supply pipe 52 (52a to 52h) for supplying an oil from an oil supply source (not shown) to each of the application nozzles 51a to 51h. The oil supply pipes 52a to 52h correspond to the oil supply pipes 52a to 52h. Application nozzle
Control device 53 that controls the supply and stop of the oil agent to 51a to 51h
(53a to 53h) are arranged.

In this embodiment, the inner peripheral surface 2a of the mold M is the anode A
2a ₁ , 2a ₅ forming the side outer peripheral surface of the ear portion of 2a; 2a ₂ , 2a ₃ , 2a ₄ forming the upper outer peripheral surface of the ear portion of the anode A;
2a ₆ , 2a ₁₀ forming the lower outer peripheral surface of the ear portion 2a ₇ , 2a ₉ forming the side outer peripheral surface of the body of the anode A; and 2a ₈ forming the lower outer peripheral surface of the body of the anode A Therefore, in the present embodiment, the application nozzle 51 includes the nozzles 51a and 51h corresponding to the side inner peripheral surfaces 2a ₁ and 2a ₅ of the mold M and the upper inner peripheral surfaces 2a ₂ and 2a of the mold M. Nozzles 51b to 51 corresponding to ₃ and 2a ₄
g is provided. The nozzles 51b and 51g correspond to the lower inner peripheral surfaces 2a ₆ and 2a ₁₀ of the mold, and the lower inner peripheral surfaces 2a of the other molds.
₈ corresponds to the nozzles 51d and 51e. Further, the mold M
It is against the side inner peripheral surface 2a ₇ and 2a ₉ nozzles 51c and 51f are configured to correspond.

The operation of the casting apparatus having the above configuration will be described. The mold M is continuously conveyed in the direction of the arrow by the conveying means 100, and the upper inner peripheral surfaces 2a ₂ , 2a ₃ and 2a _{4 of} the mold M are applied to the coating apparatus 50.
Is reached, the corresponding control means 53 causes the mold M
Upper inner peripheral surface 2a ₂ of, 2a _3, nozzles 51b~51g corresponding to 2a ₄
Is activated, and subsequently, the nozzles 51a and 51h corresponding to the side inner peripheral surfaces 2a ₁ and 2a ₅ of the mold M are activated to spray the oil agent.

Nozzle 5 corresponding to upper inner peripheral surface 2a ₂ , 2a ₃ , 2a ₄ of mold M
1b to 51g are stopped after spraying for a predetermined time, while the mold M
The nozzles 51a and 51h corresponding to the side inner peripheral surfaces 2a ₁ and 2a ₅ continuously spray.

Next, the lower inner peripheral surfaces 2a ₆ and 2a _{10 of} the mold
Upon reaching the position, the application nozzles 51ao and 51h are stopped, and the application nozzles 51b, 51c and 51f, 51g are operated by the corresponding control means.

The application nozzles 51b and 51g are stopped after operating for a predetermined time, and the application nozzles 51c and 51f are continuously operated. As a result, the lower inner peripheral surface of the mold is applied by the coating nozzles 51b and 51g.
The oil agent is applied to 2a ₆ and 2a ₁₀ , and the application nozzles 51c and 51f
Oil is applied to the side inner circumferential surface 2a ₇ and 2a ₉ of the mold at.

When the lower inner peripheral surface 2a _{8 of the} mold reaches the coating device 50 position,
The application nozzles 51c and 51f are stopped, and the application nozzles 51d and 51e are operated by the corresponding control means, and stop after a predetermined time. Thus, oil is applied to the lower inner circumferential surface 2a ₈ of the mold.

As described above, according to the present invention, the operation and the stop of each application nozzle 51 are selectively controlled by the control means 53 in accordance with the shape of the inner peripheral surface of the mold M, so that the oil agent is added to the mold M.
Can be uniformly applied only to the inner peripheral surface of the inside.

Particularly, in order to efficiently apply the oil agent to the upper inner peripheral surface 2a ₂ , 2a ₃ , 2a ₄ of the mold M, the upper inner peripheral surface of the mold M
It is preferable to arrange the application nozzle 51 in accordance with the shapes of 2a ₂ , 2a ₃ , and 2a _4. For this purpose, as shown in FIG. It can be configured in a shape corresponding to the surfaces 2a ₂ , 2a ₃ and 2a ₄ . Further, the gantry 55 can be supported on a support base (not shown) so as to be able to move up and down so that the distance between the nozzle (not shown) and the mold M can be adjusted.

As the application nozzle 51 that can be used in the present invention, for example, Lumina Automatic Spray Gun ST-5 (trade name: manufactured by Fuso Seiki Co., Ltd.) is preferably used.

Using the casting device of the above configuration, rapeseed oil as an oil agent,
Various tests were performed using turbine oil, waste oil, and heavy oil. The test results are shown in Tables 1, 2, and 3.

Table 1 shows the results of examining the occurrence of casting in accordance with the type of oil agent. When rapeseed oil and turbine oil were used, the appearance rate of casting was greatly reduced from 39% in the past to 1%. Could be reduced.

Table 2 shows the results of examining the appearance rate of casting by oil application amount using rapeseed oil, and the application amount was 50 ml / m ^{2 to} 150
When it was ml / m ² , the appearance rate of the cast upholstery could be 1%.

Table 3, a rapeseed oil, a range of the oil coating quantity ^{50ml / m 2 ~150ml / m 2} , and when applied to the entire inner surface of the mold shows the results when applied only to the inner peripheral surface of the mold, It was found that when applied to the entire inner surface of the mold, the casting surface of the cast anode was roughened in an uneven manner.

Effect of the Invention The method and the apparatus for casting an anode for copper electrolysis according to the present invention configured as described above have almost no casting in the cast anode, and therefore, troubles in the anode alignment machine during copper refining. And the short circuit at the time of electrolysis is eliminated, the insertion of the seed plate (cathode) becomes extremely easy, and the current efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a casting apparatus for an anode for copper electrolysis according to the present invention. FIG. 2 is a perspective view showing another embodiment of the base of the application nozzle. FIG. 3 is a perspective view of a mold. FIG. 4 is a perspective view of the anode. 50: Oil application device 51: Application nozzle 52: Oil supply pipe 53: Control means 100: Mold transport means

Claims (3)

(57) [Claims] 1. A method for casting an anode for copper electrolysis by pouring molten copper into a mold, wherein an oil agent having a flash point of 190 ° C. to 230 ° C. and a kinematic viscosity of 50 cSt or less before pouring the molten copper into the mold. the inside periphery of the mold, 50 ml / m ² ~ 150 mL / casting method of anode copper electrolyte, characterized in that m be prevented cast clad generated by applying a ratio of ^2. 2. The method for casting an anode for copper electrolysis according to claim 1, wherein the oil agent is rapeseed oil or turbine oil. 3. A mold conveying means for supporting a mold in a horizontal state and conveying the mold along a predetermined conveying path, and an oil applying device provided above the mold conveying means and provided across the conveying path of the mold. The oil application device comprises: a plurality of application nozzles, an oil supply pipe that supplies an oil from an oil supply source to each application nozzle, and a control device that controls stopping supply of the oil to each application nozzle. An apparatus for casting an anode for copper electrolysis for carrying out the method of claim 1, comprising: