JP2004323886A - Method for charging powdery copper scrap in converter blowing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for charging powdery copper scrap by which the powdery copper scrap is prevented from blowing off from a nose in a converter when charging the powdery copper scrap into molten matte while performing a blowing in the converter. <P>SOLUTION: In the method for charging the powdery copper scrap into the molten matte while blowing the en matter by using the converter, the powdery copper scrap is stored into a metallic container, and the metallic container is press-formed, thereafter the powdery copper scrap is charged together with the metallic container into the molten matte. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a powdery copper scrap (hereinafter, referred to as powdery copper) while blowing a molten mat and white glue (hereinafter, referred to as a melt) using a converter when performing copper smelting. The present invention relates to a powdery copper charging method for charging copper.
[0002]
[Prior art]
In general, in copper smelting, dried copper concentrate is smelted in a flash smelting furnace to separate it into mats and slags, and the mat obtained in the flash smelting furnace is charged into a pierce-Smith type converter to perform blowing. To produce blister copper through white glue.
In blowing the solution using a converter, a mat having a copper content of about 60 to 65% by mass obtained in a flash furnace is charged into the converter, and then the converter is inverted to a predetermined position, and air is blown. Alternatively, oxygen-enriched air is blown from a plurality of tuyeres. In this way, the impurity component in the mat is oxidized in the fermentation period to separate it into SO ₂ gas, slag and white glue, and further in the copper making period, the white glue is blown with a converter to reduce the copper content. About 98-99% by weight of blister copper is obtained.
[0003]
Blowing in the converter is roughly divided into a period in which slag and white glue are generated (so-called copper making period) and a period in which blister copper is generated from white glue (so-called copper making period). In both the fermentation period and the coppermaking period, the oxidation reaction by oxygen-enriched air blown from the tuyere or oxygen in the air proceeds, so that the mat or white glue etc. The temperature rises due to the heat of oxidation.
[0004]
When the temperature of the solution in the converter rises, the refractory lining of the converter is melted. Therefore, it is necessary to suppress a rise in the temperature of the melt in order to prevent a decrease in the durability of the converter. Therefore, conventionally, for the purpose of suppressing a rise in the temperature of the melt, waste copper is charged from the furnace port as necessary.
Waste copper is a collection of scraps of various copper products, and has various shapes such as rod-shaped copper, plate-shaped copper, wire-shaped copper, powdered copper, etc. The dimensions are also distributed over a wide range.
[0005]
When charging the powdered copper, the hot air rising from the furnace opening is blown upward by the smoke exhaust equipment provided above the converter, and there is a problem that efficient charging cannot be performed.
[0006]
[Problems to be solved by the invention]
The present invention solves the above-mentioned problems, and provides a powdered copper charging method capable of preventing powdered copper from being blown up from a furnace opening of a converter when charging powdered copper. With the goal.
[0007]
[Means for Solving the Problems]
The present invention relates to a powdery copper loading method for charging powdery copper, comprising: placing the powdery copper in a metal container, press-forming the metal container, and then loading the powdery copper with the metal container. It is a powdery copper charging method to be charged.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a layout diagram schematically showing an example of an apparatus to which the present invention is applied.
The blowing performed in the converter 1 improves the quality of the mat obtained in the flash furnace (not shown) and produces blister copper through white glue. That is, a mat having a copper content of about 60 to 65% by mass obtained in a flash furnace is charged into the converter 1, and oxygen-enriched air or air is blown from the tuyere 2 to oxidize impurity components in the mat. SO ₂ gas is separated into slag and white leather, to produce a blister copper by increasing the copper content of I or resulting white about 98-99 wt%.
[0009]
This blowing is roughly divided into a period in which slag and white glue are generated (so-called copper making period) and a period in which blister copper is generated from white glue (so-called copper making period). In both the canning period and the coppermaking period, the oxidation reaction by the oxygen-enriched air blown from the tuyere 2 or oxygen in the air proceeds, so that the temperature of the melt accommodated in the converter 1 is increased by the oxidation heat. Rise by
[0010]
When the temperature of the melt (that is, the mat and the white glue) in the converter 1 rises, the refractory lining of the converter 1 is melted, and the durability of the converter 1 is reduced. Therefore, various kinds of copper, including powdery copper, are charged from the furnace port 3 of the converter 1 to suppress the temperature rise of the melt.
Prior to charging into the converter 1, the powdered copper is previously stored in a metal container 8, the opening of which is closed, and then press-formed as shown in FIG. As a result, scattering of the powdered copper can be prevented when the metal container 8 containing the powdered copper is transported or charged from the furnace port 3. In particular, when the metal container 8 containing the powdered copper is charged from the furnace port 3, it is possible to prevent the powdered copper from being blown up.
[0011]
In closing the opening, a lid corresponding to the opening of the metal container 8 may be provided, or a copper plate slightly smaller than the opening may be placed on the powdered copper. That is, the means for closing the opening may be appropriately selected so as to prevent the powdery copper in the metal container 8 from spilling during transportation or press molding. Therefore, the opening of the metal container 8 does not necessarily need to be sealed.
[0012]
The shape to be press-formed is preferably a cubic or rectangular parallelepiped having a flat periphery in order to prevent the metal container 8 from falling down when the metal container 8 containing powdered copper is carried. However, the shape does not necessarily have to be a flat surface, and as shown in FIG. 2, there is no problem even if the shape has a convex surface enough to prevent a fall or the like. Incidentally, (in the shape having a convex surface, the maximum value t ₁ of the _{longitudinal,} the maximum value t ₂ of the _lateral, the maximum value t _{3 longitudinal)} dimension of press forming is not limited to a specific number, the furnace opening 3 May be set as appropriate according to the size of.
[0013]
The material of the metal container 8 is not limited to a specific component. However, in view of the characteristics of the converter operation, it is preferable to use a container (for example, a drum) or the like containing iron as a main component as the metal container 8 used when charging powdered copper during the fermentation period. Since the iron contained in the metal container 8 is oxidized and separated as slag, the metal container 8 containing iron as a main component may be used.
[0014]
On the other hand, when a metal container 8 used when charging powdered copper during the copper making period is a drum having iron as a main component, a high melting point oxide containing iron as a main component is Fe ₃ O ₄ . It is preferable to use a container containing copper as a main component, since (so-called bumps) are generated. However, since the amount of iron used is small, the operation of the converter 1 is not hindered even if a drum containing iron as a main component is used.
[0015]
It should be noted that there is no particular problem in charging the powdery copper using the metal container 8 containing copper as a main component in both the fermentation period and the coppermaking period.
In this way, the powdered copper is charged from the furnace port 3 together with the metal container 8. The means for accommodating the pressurized metal container 8 containing the powdery copper is not limited to a specific configuration. For example, as shown in FIG. 1, a metal container 8 press-formed is loaded on a charging boat 6, and the charging boat 6 is suspended from a ceiling crane (not shown) using a wire 5 to load the metal container 8. You can enter. Alternatively, even if an automatic charging device is used, charging can be performed without any trouble.
[0016]
When the metal container 8 is charged, hot air rises from the furnace port 3. The hot air is sent from a smoke exhaust hood 7 to a smoke exhaust treatment facility (not shown). By applying the present invention, it is possible to prevent the powdered copper from being blown up by hot air, so that the charged amount of the powdered copper does not decrease. As a result, the effect of suppressing the temperature rise of the melt is sufficiently exhibited. Moreover, it is possible to prevent the powdered copper from flowing into the flue gas treatment facility.
[0017]
【Example】
Prior to being used as a cooling material in the converter 1, powdery copper having a size of φ1 × 5 mm or less is preliminarily stored in a 200-liter iron drum, which is a metal container 8, in an amount of about 60% by volume. Several copper sheets of about 1 mm of scrap were placed, their openings were closed, and then press-formed in the order of up and down, east and west, and north and south. The shape was a shape having a convex surface as shown in FIG. 2, and the dimensions were 520 mm for the maximum value t ₁ in the vertical direction, 530 mm for the maximum value t ₂ in the horizontal direction, and 700 mm for the maximum value t ₃ in the length direction. .
[0018]
A mat having a copper content of 62% by mass obtained in the flash furnace was charged into the converter 1, and oxygen-enriched air was blown from the tuyere 2 to perform sperm elaboration to produce white glue and slag. The slag was discharged outside the furnace, leaving only white glue in the converter 1. Next, before the start of the copper making period, a metal container 8 containing pressurized late copper and press-formed was charged from the furnace port 3 using the charging boat 6 as shown in FIG. This is an invention example.
[0019]
On the other hand, as a comparative example, the powdered copper was stored in the metal container 8 without press molding, and the powdered copper as it was was loaded on the charging boat 6, and the furnace port was opened before the start of the copper making period. Charged from 3. Other conditions are the same as those of the first embodiment, and the description is omitted.
In the invention example, even when dust collected from the flue gas treatment facility was analyzed, powdery copper was not detected. However, in the comparative example, the powdered copper was soared and the powdered copper was detected from the dust of the flue gas treatment facility.
[0020]
Thus, in the present invention, it was confirmed that the powdery copper can be prevented from being blown up from the furnace port 3.
[0021]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, when charging powdered copper into a melt in a converter, it can prevent that powdered copper is blown up from the furnace opening of a converter.
[Brief description of the drawings]
FIG. 1 is a layout diagram schematically showing an example of an apparatus to which the present invention is applied.
FIG. 2 is a perspective view showing an example of a shape obtained by press-molding a metal container.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Converter 2 Tuyere 3 Furnace 4 Tilting device 5 Wire 6 Loading boat 7 Smoke exhaust hood 8 Metal container

Claims (1)

In a powdery copper loading method of charging powdery copper into the melt while blowing the melt using a converter, the powdery copper is stored in a metal container, and then the metal container And pressing the powdered copper together with the metal container into the melt.

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