JPS5935996B2 - Cooling method of thin anode - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cooling thin anodes formed from hot copper strips.

Copper anodes, which have been widely used in the past, are manufactured using a series of casting equipment in which molten metal is poured into molds arranged one by one on a rotating disk, cast into a predetermined shape, and then cooled with water and removed from the molds. be done.

Copper anodes cast in this manner have a thickness of 35 mm.
~ 45 beautiful wings, showered over the mold D) The anode taken from the mold is placed in a water cooling tank in a dark red state, and does not deform even when rapidly cooled, and is widely used industrially.

However, a copper anode formed from a thermal copper strip that has recently been put into practical use, for example, a thickness of 12 to 15 B? If a thin 18 degree anode is carelessly showered or immersed in a water cooling tank, it will bend and become unusable.

This is thought to be because a thin layer of water vapor forms on the surface of the high-temperature copper anode, which prevents heat transfer and prevents uniform cooling. For this reason, the thin anode is cooled by leaving it to room temperature in the atmosphere. However, in the cooling method, copper oxide scale is generated on the surface of the thin anode due to the slow cooling rate.

If this copper oxide scale adheres to the current-carrying part of the copper anode, it will cause poor contact, and if it gets into the electrolytic tank, it will dissolve in the electrolyte, increasing the copper ion concentration in the electrolyte and worsening the electrolytic conditions. In addition, copper oxide scale that peels off from the copper anode during handling causes operational problems such as copper loss and contamination of the working environment.

The inventors of the present invention have conducted various experiments to solve the above-mentioned drawbacks and to find a method for producing a thin anode with good operational efficiency.
It was confirmed that when a thin anode formed from a heated copper strip was cooled under the following conditions, the thin anode did not bend and there was no adhesion of copper oxide scale. The cooling conditions are: 1) In the cooling process of the thin anode, the thin anode is allowed to cool to 350° C. in the atmosphere, and then water-cooled.

15 If the water cooling start temperature is higher than 350°C, the thin anode will be curved.

2) When cooling with water, spray the cooling water from a direction perpendicular to the flat surface of the suspended thin anode, that is, avoid a direction that collides with the flat surface perpendicularly.

When cooling is sprayed in a direction perpendicular to the flat part of the anode, it is difficult to cool the front and back sides of the flat part in the same way, resulting in a difference in cooling rate and causing the thin anode to curve.

3) Absolutely avoid rapid cooling.

When spraying cooling water, the amount of water is initially small and gradually increased, and the water droplets in the spray gradually change from fine to coarse.

Further, the water cooling rate of the thin anode is preferably 84° C./min or less.

A method for cooling a thin anode under the above conditions will be described based on an embodiment shown in FIG.

In FIG. 1, 1 is a chain conveyor that suspends and moves a large number of thin anodes at regular intervals.
3 (only the claws are shown in the drawing), the anodes are placed as anode group 1' at the transfer start end of the chain conveyor 11. The anode group 2 placed on the transfer start tip of the chain conveyor 1'1) is transferred to the chain conveyor 1'1'1.
The anode distributor 4 installed in the anode distributor 4 distributes the anode to the chain comparator 1 at regular intervals, and the anode is suspended and moved. A cooling water injection mechanism in which a large number of nozzle groups with different cooling water injection amounts and injection pressures are arranged is provided above the thin anode 1 that is suspended and moved. The nozzle group 5 performs slow cooling with a small amount of atomized cooling water. As the slowly cooled thin anode 2' is transferred, the cooling rate is further increased by the cooling water from the next nozzle group TE, which has a larger amount and injection pressure of injection cooling water than the nozzle group 5, and is further transferred. Then, the thin anode 2' is cooled by the cooling water of the nozzle group 5', which has the highest amount of cooling water and the highest jetting pressure, to a temperature below which copper oxide scale does not occur. Wash and remove the copper oxide scale that has formed. The thin anode 1 after cooling with water is further transferred by the chain conveyor 11 and placed at the end of transfer of the chain conveyor 11, or collected in 7 tanks 18. The thin anode group 2, which has been assembled in a set number, is pushed up by a hydraulic cylinder 9 provided on the lifter 8 and transported to a predetermined location by a forklift, etc. As described above, when implementing the water cooling method of the present invention using a large number of nozzle groups, the nozzle diameter, the arrangement of the nozzle groups, and the injection amount and injection pressure of cooling water are adjusted so that the thin anode is cooled as uniformly as possible. It is important to determine the

Further, although FIG. 1 shows a cooling device in which the cooling water injection nozzle is provided only in the upper part, it may be provided in the side part if necessary.

Next, a specific example of a thin anode cooled by the cooling method of the present invention will be shown.

A continuous chain conveyor 1 with a loading capacity of 12.7 m, a thin anode group placement section provided at the transfer start end of the chain conveyor 1, and the thin anode group placement section. a distributor 4 that distributes the thin anodes placed on the chain conveyor 11 at regular intervals; a lifter 8 provided at the end of the chain conveyor 1 1 where the transfer is completed; and a lifter 8 that collects the transferred thin anodes 7; Cooling water is sprayed in the form of a mist onto a thin anode transfer mechanism consisting of a hydraulic cylinder 9 installed in the lower corridor of the lifter 8 and which pushes up the lifter 8, and the thin anode transfer mechanism. a nozzle group 5 for slowly cooling the anode, a nozzle group 5' for ejecting a larger amount of cooling water than the nozzle group 5 and increasing the cooling effect of the thin anode, and a nozzle group 5' for increasing the amount of cooling water and the injection pressure to the highest ,
In addition to cooling the thin anode, a water cooling device equipped with a nozzle group 5'' is installed to clean and remove copper oxide scale generated and adhered before water cooling, and a group of 40 thin anodes formed from hot copper anodes is transported by a forklift. transported by
The anode group 2 placed on the thin anode group mounting portion of the transfer mechanism is measured with a thermistor thermometer, and when the temperature of the thin anode group 2 drops to 350°C, the thin anode is removed by the chain conveyor 1. The thin anode was cooled by suspending the anode at an interval of 300 lines and at a feed rate of 3 m/min, and dividing the cooling water injection nozzle group into three equal parts, such as 5, 5', and 5, to inject the following cooling water. As a result, the thin anodes showed almost no curvature, making all of them usable for practical use, and there was no copper oxide scale buildup, which could not be prevented by conventional air cooling.

In this example, the required amount of water to be injected is set by changing the water pressure in each pipe, but the required amount of water to be injected is set by keeping the water pressure in each pipe constant and changing the nozzle diameter. Also good. Furthermore, if a washing water tray as shown in Fig. 17 is provided at the bottom of the water cooling device, the copper oxide scale washed and removed by the water cooling can be easily recovered, and the copper oxide scale can be recycled. Not only can it be used, but it can also prevent contamination of the working environment caused by conventional scattering. The thin anode obtained by the method of the present invention described above can be cooled quickly without taking up much space compared to the conventional cooling method of cooling in the atmosphere, and there is no copper oxide scale attached, so there is no problem in current contact during electrolytic treatment. It is also extremely useful industrially, as it can prevent an increase in copper ion concentration in the electrolytic solution, increase electrolytic efficiency, and prevent environmental pollution caused by scattering of copper oxide scale.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a cooling device for a thin anode. 1 is a chain conveyor, 2 is an anode, 3 is a forklift, 4 is an anode distributor, 5 is an injection nozzle, 6 is a wash water, 7 is a wash water receiver, . 8 beams, 7 shafts, 9 is a hydraulic cylinder, and 10 is a forklift.

Claims (1)

[Scope of Claims] 1. When cooling a thin anode formed from a hot copper strip, a plurality of suspended thin anodes are placed above the thin anode at regular intervals while the thin anode is being transported in order to cool the suspended thin anode with water. A cooling water injection mechanism having appropriately arranged nozzle groups is provided, and after the thin anode suspended by the transfer mechanism is allowed to cool in the atmosphere to below 350°C, water is injected from the nozzle group of the cooling water injection mechanism and the anode is moved. Cool the thin anode,
A method for cooling a thin anode, characterized in that the thin anode is cooled with water at a rate of 84° C. or less per minute. 2. The amount and/or injection pressure of the cooling water injected from the nozzle group provided in the cooling mechanism is gradually increased as the thin anode that is suspended and moved by the transfer mechanism advances, and the thin anode is A method for cooling a thin anode according to claim 1, characterized in that the method comprises cooling a thin anode.