JPH10219367A - Copper shaft furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the clogging of burners and the closure of a tap hole which arise during operation and to satisfactorily maintain a furnace condition by forming the hearth section of a copper shaft furnace to a conical shape and specifying the angles of the plural burners in the lower part of the side wall of a furnace body with a horizontal plane. SOLUTION: The hearth section 20 of the copper shaft furnace which melts copper and copper alloy in a reducing atmosphere is formed to the conical shape. The angle of inclination of a conical recessed part is specified to 3 to 60 deg. and the depth of this conical recessed part to 5 to 40% of the radius of the hearth section. The plural burners 40 disposed in the lower part (heating zone A) of the side wall of the furnace body 1 are directed toward the center of the hearth section 20 and the angle θ thereof with the horizontal plane is specified to 3 to 30 deg.. As a result, the clogging of the burners 40 and the closure of the tap hole 30 during the furnace operation are suppressed and prevented and the productivity of the production process of molten copper is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a copper shaft furnace used for reduction melting of copper and copper alloy.

[0002]

2. Description of the Related Art The reduction melting method of copper and copper alloy which is currently widely used is a reduction melting method using a shaft furnace.
As the melting raw material, a low oxygen electrolytic copper ingot that has been deoxidized by refining and electrolytic refining of the blister copper that has been subjected to converter processing is used, and is melted in a reducing atmosphere so as not to increase the oxygen concentration. Is the way.

[0003] The shaft furnace is a reactor that can take advantage of the high charging density of bulk raw materials, in which raw materials are charged from the furnace top and products are extracted from the furnace bottom. From the functional aspect, it can be classified into three types: packed bed type, solid phase reaction moving layer, and blast furnace type moving bed. Among them, the blast furnace type moving bed is of a type in which the charge is melted in the furnace after reacting, so that a mechanical discharge mechanism is not required, and the operation can be continuously performed. Further, by melting, the metal and unnecessary coexisting substances such as gang components can be sufficiently separated.

FIG. 4 shows an example of a conventional shaft furnace (Asarco type) used for reductive melting of copper. This shaft furnace is a vertical furnace having a pre-tropical zone C, a melting zone B, and a heating zone A in order from the top. Raw materials are charged from the raw material charging inlet of the shaft furnace, and the charged raw materials are supplied to the side wall 2 of the furnace body 1.
Preheat is performed by the burners 60 disposed in 3 and 4 (pre-tropical zone C), and further burned and melted by the burners 50 (melting zone B). The molten copper thus generated is heated by the burner 80 in the hearth 70 to prevent solidification (heating zone A), and the tap hole 30 is provided from the hearth by the inclination ε provided in advance in the tap hole 30. From 30 continuously taken out of the furnace.

[0005]

However, as a raw material to be charged into the shaft furnace 1, a mixture of electrolytic copper and turning chips is mainly used, and each raw material has a different shape and a surface area / volume ratio. Since the amount of heat required for melting is not constant and varies, and the heat is controlled, the delay time is as long as 1-2 hours. For this reason, since the liquid level of the molten copper constantly fluctuates up and down, when the temperature rises significantly, there is a problem that the burner 80 of the heating zone A is clogged with the molten copper.

Further, since the hearth portion 70 of the shaft furnace 1 has a flat shape, the flow of the molten copper and the thermal efficiency are poor.
The molten copper easily solidifies at the zero end. For this reason, the hearth portion 70 of the shaft furnace 1 is closed by the unmelted copper metal, the liquid level of the molten copper rises significantly, and the burner 80 of the heating zone A is heated.
Clogging with molten copper occurs. Furthermore, shaft furnace 1
When the unmelted copper ingot solidified in the hearth 70 flows into the tap hole 30 together with the molten copper, the tap hole 30 is closed.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to prevent clogging of a burner and blockage of a tap hole which occur during operation of a shaft furnace. Another object of the present invention is to provide a copper shaft furnace capable of improving productivity of a molten copper production process and maintaining a favorable furnace state.

[0008]

According to the present invention, there is provided a copper shaft furnace for melting copper and a copper alloy in a reducing atmosphere, wherein a hearth portion is formed in a mortar shape and a furnace body is formed. A copper shaft furnace is provided, wherein a plurality of burners arranged at a lower portion of the side wall are inclined toward a center of the hearth and in a range of 3 to 30 degrees with respect to a horizontal plane.

Further, it is preferable that the inclination angle of the mortar-shaped concave portion of the hearth portion is 3 to 60 degrees, and the depth of the mortar-shaped concave portion is in the range of 5 to 40% of the radius of the hearth portion.

[0010] Furthermore, it is preferable that a burner tile provided at a lower portion of the side wall of the furnace body and into which a burner is inserted is formed in a divided manner. It is preferred that

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In a copper shaft furnace of the present invention, a hearth portion is formed in a mortar shape, and a plurality of burners provided at a lower portion of a side wall of a furnace body are directed toward a center of the hearth portion and in a horizontal plane. Is inclined in the range of 3 to 30 degrees.

[0012] The copper shaft furnace of the present invention has the above-described configuration to prevent the clogging of the burner and the blockage of the tap hole that occur during the operation of the shaft furnace, thereby producing molten copper. Can increase process productivity and maintain favorable furnace conditions

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is an example of a copper shaft furnace of the present invention,
(A) is a schematic cross-sectional view, (b) is a partial explanatory view around the hearth.

One of the features of the copper shaft furnace of the present invention is that, as shown in FIG. 1, the hearth 20 is formed in a mortar shape. This makes it possible to relatively easily retain the molten copper, which is a drawback of the conventional shaft furnace 1, and thus has an effect of keeping the amount of molten copper and the molten copper temperature in the shaft furnace 1 constant. Further, since the radiant heat due to the flame of the burner is easily focused on the hearth portion 20, the heat is sufficiently dispersed not only in the center portion of the hearth portion 20 but also in the peripheral end portion, so that the molten copper can be efficiently heated. it can. For this reason, especially the hearth 2
0 can prevent solidification of molten copper at the peripheral end,
Blockage of the tap hole 30 by unmelted copper metal can be prevented.

Further, as shown in FIG. 1B, a plurality of burners 4 disposed below the side walls 2, 3, 4 of the furnace body 1.
0 to the center of the hearth 20 and 3 to 3 with respect to the horizontal plane.
By inclining in the range of 0 degrees (θ ₁ ), the molten copper can be efficiently heated in the hearth, and the intrusion of the molten copper into the burner tile can be suppressed.

Next, the hearth used in the copper shaft furnace of the present invention will be further described. FIG. 2 is an example of a hearth portion of the copper shaft furnace of the present invention, (a) is a schematic front view,
(B) is a schematic side perspective view, (c) is an AA of (b).
It is sectional drawing.

The hearth section 20 of the copper shaft furnace 1 of the present invention
As shown in FIGS. 2 (a) and 2 (c), a hearth base material 22 and convex members 24a,
24b and the fan-shaped convex member 26 at a position facing the tap hole 30 to form the mortar-shaped hearth 2
0 is formed.

Then, as shown in FIG. 2C, the inclination angle δ of the mortar-shaped recess of the hearth 20 is 3 to 60 degrees, and the depth b of the mortar-shaped recess is 5 of radius a
The range of 40% is preferable because the molten copper is prevented from entering the burner tile, and the molten copper flows out of the tap hole efficiently.

The material of each member constituting the hearth portion 20 is not particularly limited, but the hearth base portion 22 and the convex members 24a and 24b are made of oxide-bonded SiC or nitride-bonded SiC. Is preferred for corrosion resistance and wear resistance. The fan-shaped convex member 26 is preferably made of a SiC ramming material for corrosion resistance and wear resistance.

Further, the lower burner tile on the side wall of the copper shaft furnace of the present invention will be described. FIG. 3 is an example of a side wall lower burner tile of the copper shaft furnace of the present invention;
(A) is a schematic front view, (b) is a schematic cross-sectional view.

As shown in FIG. 3, the side wall lower burner tile 40 of the copper shaft furnace of the present invention includes first bricks 42a,
The burner crater 48 is formed by combining the 42b and the second brick 44 at predetermined positions.

As described above, it is preferable that the burner tiles 40 be divided and formed so that the burner tiles 40 can be easily repaired.

Furthermore, in the lower burner tile 40 of the side wall of the copper shaft furnace 1 of the present invention, the crater for the burner of the second brick 44 is formed higher than the crater 48 for the burner of the second bricks 42a and 42b, so that weirs The convex part 46 is formed in the burner crater 48 in a step shape.

Thus, it is possible to contribute to preventing molten copper from entering the burner crater 48 of the burner tile 40.

The first bricks 42 a, 42 b constituting the side wall lower burner tile 40 of the copper shaft furnace 1 of the present invention
The material of the second brick 44 is not particularly limited, but is preferably an oxide-bonded SiC material for spalling resistance and abrasion resistance.

[0026]

As described above, the copper shaft furnace of the present invention suppresses and prevents burner clogging and tap hole clogging that occur during operation, thereby improving the productivity of the molten copper production process. And maintain a good furnace condition.

[Brief description of the drawings]

FIG. 1 is an example of a copper shaft furnace of the present invention, wherein (a)
Is a schematic cross-sectional view, and (b) is a partial explanatory view around the hearth.

FIG. 2 is an example of a hearth portion of a copper shaft furnace of the present invention, wherein (a) is a schematic front view, (b) is a schematic side perspective view, and (c) is an AA of (b). It is sectional drawing.

3 is an example of a side wall lower burner tile of the copper shaft furnace of the present invention, (a) is a schematic front view, and (b) is
It is a schematic cross section.

FIG. 4 is an example of a conventional copper shaft furnace, in which (a)
Is a schematic cross-sectional view, and (b) is a partial explanatory view around the hearth.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Furnace body (furnace main body), 2-4 ... Side wall, 6-8 ... Lower partition, 20, 70 ... Hearth, 22 ... Hearth base, 24a, 2
4b: convex member, 26: fan-shaped convex member, 30: tap hole, 40, 80: side wall lower burner (heating zone A), 41: side wall lower burner tile (heating zone A), 4
2a, 42b: first brick, 44: second brick, 46: crest-shaped convex part, 48: burner crater, 50: side wall intermediate burner (melting zone B), 60: side wall upper burner (pre-tropical C).

[Procedure amendment]

[Submission date] February 23, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Deleted

Claims (4)

[Claims] 1. A copper shaft furnace for melting copper and a copper alloy in a reducing atmosphere, wherein a hearth portion is formed in a mortar shape, and a plurality of burners are provided at a lower portion of a side wall of the furnace body. Characterized by being inclined toward the center of the hearth and in a range of 3 to 30 degrees with respect to a horizontal plane. 2. The angle of inclination of the mortar-shaped concave portion of the hearth is 3 to 3.
2. The copper shaft furnace according to claim 1, wherein the angle is 60 degrees, and the depth of the mortar-shaped concave portion is in a range of 5% to 40% of a hearth radius. 3. The copper shaft furnace according to claim 1, wherein a burner tile provided at a lower portion of a side wall of the furnace body and into which a burner is inserted is formed in a divided manner. 4. A burner crater of a burner tile provided at a lower portion of a side wall of a furnace main body and into which a burner is inserted is formed in a step shape and an outer portion is formed high.
4. The copper shaft furnace according to any one of items 1 to 3.