JPS6149369B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in a method and apparatus for recovering copper from copper oxide powder.

Conventionally, copper oxide powder is dried, then remelted and reduced in a molten state to copper oxide with as low an oxidizing component as possible, which is then mixed with pure copper and used as an anode. However, this method requires complicated processing such as a drying step, a dissolution step, and a reduction step, and requires a huge amount of energy, resulting in high costs.

Note that the above-mentioned copper oxide is produced in a separate factory or in a separate process without being operated continuously and consistently with the manufacturing process of copper products.

As a result of extensive research in view of the current situation, the present invention aims to provide a method and apparatus for recovering copper oxide powder as copper for copper products in a short period of time through a continuous process. That is, the recovery method of the present invention is to introduce copper oxide powder from the copper oxide supply port of a reduction furnace equipped with a copper oxide supply port and a reduction flame jet port, and perform reduction under normal pressure or pressurization from the reduction flame jet port. After spraying the copper oxide powder onto the copper oxide powder to reduce the skin of the copper oxide powder and melting it to form reduced molten copper, the high-purity molten copper directly connected to the reduction furnace and melted by a shaft furnace is introduced. The method is characterized in that the reduced molten copper is made to flow together in a molten copper gutter, mixed, and then cast by a casting device.

In addition, the recovery device has a copper oxide supply port for introducing copper oxide powder into one end, and a reducing flame jet port for spouting a reducing flame at a position where the reducing flame can heat and melt the copper oxide powder. The present invention is characterized in that a molten copper gutter is attached to the other end of the reduction furnace provided with a molten copper inlet into which high-purity molten copper previously produced by a shaft furnace is introduced.

In the method of the present invention, there are no particular limitations on the quality of the copper oxide powder, but if the copper oxide powder contains a large amount of oxygen, for example, one containing about 15% oxygen, it will be difficult to reduce it to tough copper, and the amount of oxygen will decrease. Those containing a small amount of oxygen, for example, around 3000 ppm, are almost reduced to tough copper. Regarding the particle size of the copper oxide powder, the reduction efficiency is improved by making it finer.

Further, as the reducing flame in the method of the present invention, a gaseous material such as a mixed gas of LPG and air is used. This reducible flame may be under normal pressure, but by spraying it onto the copper oxide powder at a pressurized state of, for example, 0.05 to 0.1 Kg/cm ² , both of them are disturbed in the reduction furnace, and the reducible flame and the copper oxide powder are sprayed together. The powder is homogenized and the skin of the copper oxide powder can be efficiently and sufficiently reduced.

In addition, in the method of the present invention, the reason why molten copper reduced in a reduction furnace (referred to as reduced molten copper) and high-purity molten copper melted in a shaft furnace are made to flow together in the molten copper gutter is to reduce the oxidized copper powder. As mentioned above, it is difficult to obtain high-purity copper, so if this reduced molten copper alone cannot be used as a copper product even though it is cast, a predetermined amount of reduced molten copper may be mixed into the high-purity molten copper depending on the purpose. This is for the purpose of use.

Next, an embodiment of the method of the present invention will be explained using the apparatus shown in the drawings.

Embodiment A reducing flame spout 2 for spouting out a reducing flame 3 is attached to one end, and a copper oxide supply port 4 for feeding a hopper 5 and copper oxide powder 6 in a direction perpendicular to the frame near this
A cylindrical reduction furnace 1 provided with a cylindrical reduction furnace 1 is tilted so that the spout 2 is raised, and a molten copper gutter 7 is attached to the other end. This molten copper gutter 7 is provided with a molten copper inlet 9 for introducing high purity molten copper 8 produced by a shaft furnace (not shown).

Then, a hopper 5 is attached to the copper oxide supply port 2, and copper oxide powder (oxygen content 7000 ppm, average particle size 500 microns) 5 is filled into the hopper, and 1.5~
Input under the condition of 2.0Kg/min. On the other hand, a mixed gas flame 3 of butane gas and air was ejected under conditions of 1.5 to 2.5% hydrogen in the mixed gas and sprayed onto the copper oxide powder 5.

Note that the frame and the copper oxide powder are separated by about 30 cm.

The copper oxide powder is heated to about 1200°C by the gas flame, and its skin is reduced and melted, descending along the inner wall of the reduction furnace and flowing out into the molten copper gutter. Separately, high-purity molten copper 8 obtained from a shaft furnace (not shown) is made to flow into the molten copper gutter 7 from the molten copper inlet 9, mixed with the above-mentioned reduced molten copper, and this mixed molten copper is sent to the casting machine. Copper ingots are obtained by feed casting.

As a result of measuring the oxygen content of the copper ingot obtained by the method of the present invention, it was found that it was 500~
It was 700ppm, indicating that the amount of oxygen was significantly reduced and the content was pure copper.

As detailed above, according to the present invention, it is possible to efficiently recover copper from copper oxide powder through simple steps and low energy consumption, and it also has remarkable effects such as being able to continuously operate post-processes such as casting. have

[Brief explanation of the drawing]

The drawing is a schematic explanatory diagram showing one example of an apparatus for recovering copper in the present invention. 1... Reduction furnace, 2... Reducing frame supply port,
3... Reducing frame, 4... Copper oxide powder supply port,
6... Oxidized copper powder, 7... Molten copper gutter.

Claims (1)

[Scope of Claims] 1. While introducing copper oxide powder from the copper oxide supply port of a reducing furnace equipped with a copper oxide supply port and a reducing flame jet port, normal pressure or pressurization can be carried out from the reducing flame jet port. High-purity molten copper that is directly connected to the reduction furnace and melted in a shaft furnace after spraying a reducing flame onto the copper oxide powder to reduce the skin of the copper oxide powder and melting it to form reduced molten copper. A method for recovering copper, characterized in that the reduced molten copper is co-flowed into a molten copper gutter into which the molten copper is introduced, mixed, and then cast using a casting device. 2. A copper oxide supply port into which copper oxide powder is introduced at one end;
High-purity molten copper prepared in advance by a shaft furnace is introduced into the other end of the reducing furnace, in which a reducing flame spout for ejecting a reducing flame is installed at a position where the reducing flame can heat and melt the copper oxide powder. A copper recovery device characterized by being equipped with a molten copper gutter having a molten copper inlet.