JPS59197533A - Continuous dry refining method and apparatus for blister copper - Google Patents

Abstract

PURPOSE:To continuously refine blister copper in good efficiency, by a method wherein an introducing pipe to a vacuum furnace is provided to a blister copper supply side and a part of copper subjected to vacuum treatment in the furnace is recirculated for the purpose of performing vacuum treatment while the other part is continuously recovered as refined copper. CONSTITUTION:Molten blister copper is preliminarily received in a receiving furnace 3 to be subjected to vacuum treatment by a vacuum furnace 15 and, at the same time, blister copper 1 is supplied to the receiving furnace 3 from a supply trough 2. Supplied blister copper rises through the introducing pipe 15 of the vacuum furnace 15 and reduced during this time by the reductive gas from a blowing port 12 to enter the vacuum furnace 15 while performing the removal of oxygen and sulfur. Herein, impurities are volatilized and removed while blister copper is fallen through a discharge pipe 6. A part thereof is recovered from an outtake port 8 through a seal plate 9 and the other geater part is forcibly sent to the side of the introducing pipe in order to be further refined while gas is blown in the furnace 3 from a tuyere 10. By this method, blister copper is continuously refined.

Description

[Detailed description of the invention] The present invention is made by subjecting blister copper to vacuum treatment.

Oxygen, sulfur, and even As, Sb, and Bi in blister copper
.

The present invention relates to a vacuum purification method and apparatus for blister copper for the purpose of removing impurities such as PB.

In copper smelting, copper concentrate undergoes the following steps: smelting in a flash furnace, wire rod in a converter, and refining in a treetop smelting furnace to obtain an anode for electrolysis.

However, in the above method, As, Bi.

It is difficult to efficiently remove impurities such as sb and pb, and it is not a desirable method, especially when processing a large amount of ore containing many impurities, or when processing scrap containing many of the above impurities.

That is, it is necessary to add another removing agent to remove the impurities, and furthermore, the treated slag cannot be efficiently separated.

Furthermore, the refining furnace, which plays the final role in the dry refining process, removes oxygen, sulfur, etc.
, Sb, Bi, Pb, and other impurities were not removed.

Therefore, if the above impurities cannot be removed.

This means that there is no significant adverse effect on the subsequent electrolytic process.

The present invention provides a method and apparatus for efficiently removing the above impurities.

One method is to provide an inlet pipe to a vacuum furnace on the side that supplies blister copper, perform vacuum treatment in the furnace, and forcibly recirculate a portion of the treated copper for the vacuum treatment. This method continuously recovers the remaining copper as refined copper.

Another invention is to provide an inlet pipe to the vacuum furnace on the side that supplies blister copper, and provide a discharge pipe that returns the blister copper to the furnace after being treated, and the discharge pipe forcibly circulates a part of the treated copper. In order to do this, the receiver relates to a device in which a tuyere is provided in the furnace, and an outlet for continuously recovering the other part is provided at a position opposite to the supply side.

Further, one embodiment of the present invention relates to the continuous dry refining apparatus for blister copper, in which the central part of the furnace is narrowed.

In another embodiment, the receiver relates to a continuous dry fin making apparatus for blister copper as described above, in which a partition is provided in the center of the furnace.

Another embodiment relates to the continuous dry refining apparatus for blister copper, which discharges exhaust gas into a pipe for supplying blister copper.

Furthermore, another embodiment M relates to the above-mentioned continuous dry refining apparatus for blister copper, which has a structure in which gas is blown into an inlet pipe to a vacuum furnace, and a blowing outlet is provided below the inlet pipe and above the molten copper.

The present invention will be explained in detail below.

The blister copper in the present invention includes blister copper extracted from a converter, scrap, and the like.

Depending on the impurity content in the processed ore, blister copper may contain Bi.
[LD2~[LO416, S'b(LO3~104%,
As(LO5~0.2%, PI)0015~00
It contains impurities of 30% and Zn1001 to 0.002%.

Also, sulfur is [1L01~[102%, oxygen is α50~
It contains about 0.60 or so. Furthermore, when raw material ore containing many impurities is processed, the above impurities are further increased.

According to the conventional method, the blister copper from the converter is passed through the tilting type refining furnace by blowing air and adding additives, removing sulfur and impurities, and then removing the oxides floating on the surface from the furnace. After that, a reduction treatment, that is, deoxidation, was performed using a reducing agent such as ammonia.

In addition, scraps such as copper and copper alloys are processed in a reverberatory furnace.

It is melted in a shaft furnace or the like, and like blister copper in a converter, some impurities are oxidized, slag is removed, and a reducing agent is blown into it to deoxidize it.

All of the above methods are batch operations, but the present invention provides a method in which the vacuum treatment is a continuous process in order to make this step continuous.

That is, the blister copper is charged into a furnace, and the blister is provided with an introduction pipe to the vacuum furnace on the blister copper supply side of the furnace. As the vacuum furnace, for example, an RH type vacuum furnace is used. In order to raise the solution into the vacuum furnace, a gas inlet is provided in the introduction pipe, and the solution is raised as the gas rises.

As the gas at this time, a reducing gas, an inert gas, or the like is used. This is to prevent the deoxidation of blister copper or the mixing of oxygen into blister copper.

The introduction pipe should have a diameter as small as possible in order to enhance the air lift effect caused by gas blowing. For this reason, it is preferable to provide several introduction pipes. This is because if the rising solution is small, a sufficient surface area can be secured in the vacuum furnace, and impurities can be sufficiently removed by volatilization. Furthermore, since the gas blowing causes the solution to rise, it is desirable that the height be low.

△ For example, in order to shorten the introduction pipe, it is desirable that the gas blowing outlet be located near the hot water level in the furnace.

The impurities removed by volatilization in the vacuum furnace are recovered by a dust remover or the like.

Further, in order to prevent the formation of deposits consisting of molten metal and impurities on the wall surface of the vacuum furnace, it is preferable to heat the electrodes.

Further, a part of the vacuum-treated copper is vacuum-treated again in a vacuum furnace, and a part of the copper is continuously taken out to obtain refined steel.

In addition, part of the vacuum-treated copper is vacuum-treated again, but in order to circulate it from the vacuum furnace outlet to the inlet pipe, the receiver forces the flow of hot water through the tuyeres installed in the furnace. Let it form. The ratio of the amount forcibly circulated and the amount taken out is 5:1 to 15.
:1 ratio.

The tuyeres, for example, two receivers, are located on both sides of the furnace, with their tips facing the inlet pipe side. Blowing gas through the siding is not just a forced circulation, but rather brings about heating and reduction effects.

Also, a partition wall is installed between the inlet pipe and the discharge pipe.

This prevents blister copper that has not been vacuum-treated from moving directly to the blister copper outlet.

Furthermore, since the exhaust gas blown into the tuyere still has reducing properties, it is desirable to introduce it into the blister copper supply pipe.

This is because the reduction treatment and heating are performed in the tube, reducing the amount of fuel and reducing agent used.

Furthermore, it is preferable that the receiver and furnace have a shape with a narrow center. This is because it is possible to prevent contamination of the treated copper due to free passage of blister copper.

Further, it is preferable that the outlet of the receiver and the furnace be formed so as to have a siphon-on-tap type or the like. The reason for this is to create a reducing atmosphere inside the furnace.

By implementing the present invention as described above, the following effects can be obtained.

(Refining of blister copper can be carried out continuously and efficiently.

In particular, the treatment is preferable for treating blister copper containing many impurities such as A r 8 b + Bi + Pb. Furthermore, it is an unprecedented method that oxygen and sulfur can be removed simultaneously with the impurity removal described above.

(2) The receiver is preferable because p recirculation can be efficiently performed through the tuyere provided in the furnace, and heating and reduction can be performed at the same time.

(3) It is also preferable that heating and reduction can be performed by introducing the exhaust gas into a pipe that supplies blister copper.

(4) By providing a certain partition wall between the inlet pipe, the outlet pipe, and the vacuum furnace, free passage of blister copper can be prevented, so that continuous refining treatment can be carried out preferably.

(5) In addition, the receiver can narrow the center of the furnace and prevent free passage of blister copper.

Better continuous purification processing can be performed.

(6) Furthermore, by blowing gas into the introduction tube at a lower position, efficient vacuum purification is possible.

Example 1 Molten blister copper discharged from a converter was purified in a furnace as shown in FIGS. 1 to 3.

Molten blister copper, which had been purified in advance, was placed in a furnace (3) and subjected to vacuum treatment in an RE type vacuum furnace (c).

At the same time, 2 Ton/H of blister copper (1) (1,170℃)
The receiver was supplied to the furnace (3) from the supply gutter (2) at r.

The supplied blister copper was raised through the introduction pipe α of the vacuum furnace Q1. At this time, ammonia gas was introduced from the gas blowing port (6) provided with three gases at a rate of 5 to 1.6 mB per hour, and the ammonia gas was introduced from the discharge port (4) of 1.6 x mB and rose.

Due to this rise, the blister copper circulates and is reduced to a vacuum furnace (b).
entered in. As a result, oxygen and sulfur are removed.

In the vacuum furnace, the vacuum pressure is α5-g.

As, Bi, Sb, and Pb were efficiently removed.

A heating electrode (7) was provided in the vacuum furnace to prevent a mixture of metal and impurities from adhering to the inner wall. Further, impurities are collected by a dust remover α9 installed in the middle of the vacuum system.

A portion of the copper that has descended through the discharge pipe (6) passes through the liquid seal plate (9).
) and was collected through the outlet (8).

Furthermore, most of the others should be refined further #)L
By blowing a mixed gas of PG sh/Hr, air at 10 Nm'/Hr, and steam at 5 Ni/Hr, it was forcibly sent to the introduction pipe α1 side.

A partition wall θ was provided between the discharge pipe (6) and the inlet pipe ah to prevent blister copper from directly passing free.

The partition walls were provided with openings at the top and bottom, respectively, to create a reducing atmosphere in the entire furnace and to circulate the molten blister copper.

In addition, the receiving furnace (3) had a structure in which the central part was narrowed to prevent the blister from passing freely, as shown in FIG.

Furthermore, as shown in Figure 3, the amount of blister copper to be supplied is as follows.

The reducing gas from the tuyere (6) was partially reduced by the gas contained therein and heated.

The purified copper treated above had the values shown in the table below, and had a significantly lower amount of impurities than copper produced using conventional methods.

Table C (Unit: 俤) Example 2 Steel scrap was treated using the same equipment as in Example 1, and the results were as shown in the table below.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an apparatus showing one embodiment of the present invention, and FIG. 2 is a plan view of the device. FIG. 3 shows one aspect of the supply side of blister copper. 3 is the furnace, 6 is the discharge pipe, 10 is the tuyere, 11 is the introduction pipe,
12 is a gas 7 blowing pipe, and 15 is a vacuum furnace. Patent applicant Nippon Mining Co., Ltd. Representative Patent Attorney (7569) Keiji Namikawa:, J, 51 i',;,'j O t, "r> 2 1) No. 3 11-(Procedural Amendment Book 1982) May 70th Director of the Japan Patent Office Kazuo Wakasugi Name of the invention Continuous dry refining method for blister copper and apparatus 5 Relationship to the case of person making amendments Patent applicant address 2-10-1 Tora-mon, Minato-ku, Tokyo Name Nippon Mining Co., Ltd. Representative Yoshin Sasaki 4, Agent 105 Telephone 582-2111 Address Nippon Mining Co., Ltd. 6, 2-10-1 Toranomon, Minato-ku, Tokyo Subject of amendment ``Details of the invention in the specification "Explanation column" and contents of amendments to Drawing 2 (1) r on page 5, line 7 ZnQ, 001-110
02% J to r Zn Q, 001 to 0.002%, etc.”
and correct it. (2) “Rise” in lines 9 and 11 of page 6 is “reflux”
and correct it. "To shorten the introduction pipe" on page 7, line 3 is corrected to "J to enhance the air lift effect." (4) "Supply gutter" on page 10, lines 10-11 is corrected to "supply pipe." do. (5) Are Figures 1 and 2 attached to the drawings? Correct to. that's all

Claims (1)

[Scope of Claims] (i) An introduction pipe to a vacuum furnace is provided on the side that supplies blister copper, vacuum treatment is performed in the furnace, and a part of the treated copper is forcibly recirculated for the vacuum treatment, A continuous, dry refining method for blister copper, which is characterized in that the other part is continuously recovered as refined steel. (2) An introduction pipe to a vacuum furnace is provided on the side that supplies blister copper, and after the blister copper is processed, Again, Uke installs a discharge pipe that returns to the furnace.
In order to forcibly circulate a part of the treated copper through the discharge pipe, the receiver is equipped with a wall in the furnace, and a take-out port for continuously recovering the other part is installed in a position opposite to the supply side. Continuous dry refining equipment for blister copper. (3) The device according to claim 2, wherein the receiver narrows the central part of the furnace. (4) The device according to claim 2, wherein the receiver is provided with a partition wall in the center of the furnace. (5) The apparatus according to claim 2, wherein the exhaust gas is discharged into a pipe that supplies blister copper. (6) Claim 2, characterized in that in a structure in which gas is blown into an inlet pipe to a vacuum furnace, a blowing discharge part is provided below the inlet pipe and above the molten copper. Apparatus described in section.