JP2005008965A - Method for operating copper smelting furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for operating a copper smelting furnace having ≥0.5 m total thickness of a slag layer and a matte layer by which a wider range of buildup can be efficiently melted. <P>SOLUTION: In the copper smelting furnace, the total thickness of the slag layer and the matte layer is made to ≥0.5 m. In the method for operating the copper smelting furnace, metal grains having 2 to 30 mm grain size and containing 50 to 95 mass% metallic Fe and 1 to 5 mass% C are poured onto a slag surface from above the slag surface toward the buildup mainly made up of Fe<SB>3</SB>O<SB>4</SB>and formed on the furnace bottom to efficiently melt and remove the buildup having Fe<SB>3</SB>O<SB>4</SB>as main component and formed on the furnace bottom. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

４〜８時間の遅れはあるものの、銑鉄粒投入地点Ａ点と水平距離で１ｍ離れたＢ点においても、ほぼ同様のビルドアップの溶解が確認された。
【００２０】
【比較例】
本比較例は、実施例と同じ、レンガ内径１０ｍ 湯深１．５ｍ ビルドアップ厚さ平均７００ｍｍ、スラグ層表面から天井レンガ下端距離１．２ｍの 銅製錬スラグＣｕ １．３ｍａｓｓ％、Ｆｅ４５ｍａｓｓ％、Ｆｅ_３Ｏ_４ １０ｍａｓｓ％、ＳｉＯ_２ ２９ｍａｓｓ％をセットリングし、Ｃｕを回収する銅製錬用電気炉で実施した。ビルドアップ溶解状況の測定も、実施例と同様に行った。
【００２１】
Ａ点より、形状約５０ｍｍ×１００ｍｍ×１５ｍｍ、組成 メタリックＦｅ９３ｍａｓｓ％、Ｃ ４ｍａｓｓ％の１個あたり重量 約５ｋｇの銑鉄インゴットを、１５分毎に１個投入した。１時間あたり平均２０ｋｇの投入を、２日間継続した。
前述したステイールロッドにより測定したビルドアップ高さを表２に示す。投入開始時点の高さを基準０として、５０ｍｍ単位で測定した。−はビルドアップの溶解を意味する。
【表２】

ビルドアップ溶解は、Ａ点では、実施例とほぼ同様の速度で進んだが、Ｂ点では、実施例では４８時間後に２５０ｍｍのビルドアップ溶解を確認できたが、比較例では５０ｍｍの溶解に止まった。
【００２２】
【発明の効果】
本発明を実施することにより、以下の効果を有する。
（１）広範囲のビルドアップを効率よく溶解除去することができる。
（２）金属粒の粒径、かさ比重、投入速度等を適切な条件とすれば、ビルドアップ溶解作業を機械化でき、また、投入地点から例えば１ｍ離れた地点のビルドアップをも効率的に溶解除去できる。
（３）ビルドアップ溶解に際しての作業環境の悪化を防止できる。
【図面の簡単な説明】
【図１】本発明の一態様であり、錬カン炉でのビルドアップ部の溶解状況を示す。
【図２】本発明の実施例であるビルドアップ溶解状況測定の様子を示す。
【図３】従来技術の一態様を示す。[0001]
[Industrial application fields]
The present invention relates to a technique for melting a buildup in a copper smelting furnace used for nonferrous metal smelting.
[0002]
[Prior art]
In a copper smelting furnace, generally, a slag produced by oxidation reaction of FeO and SiO ₂ in which iron is reacted with oxygen is formed as a melt by oxidizing a sulfide concentrate and concentrating valuable metals such as copper. They are obtained and settling in a holding container to separate them by specific gravity difference.
[0003]
In this oxidation reaction, oxidation of iron in the raw material proceeds, and a part of Fe is excessively oxidized from FeO to Fe ₃ O ₄ . Since this Fe ₃ O ₄ has a high melting point, it solidifies when it reaches the bottom of the holding container, and build-up occurs as shown in FIG. It is known that an increase in buildup not only reduces the effective volume in the holding container but also disturbs the solution flow in the holding container and inhibits the specific gravity separation of the mat and slag in the holding container. .
[0004]
Conventionally, the build-up consisting mainly of Fe ₃ O ₄ in the bottom part of the holding container is made by adding a pig iron block (general type 280 mmL × 80 mmW × 50 mmH weight ingot of about 5 kg) as a reducing agent from the top inside the holding container to the bottom. A means for reducing precipitation and reducing Fe ₃ O ₄ with pig iron is common.
[0005]
But,
1) With this method, only the buildup directly under the ingot inlet was dissolved, and it was impossible to dissolve the buildup at a portion 1 m away from directly under the inlet.
In order to dissolve a wide range of buildups, it is necessary to provide a large number of inlets. However, if provided, leakage of high-temperature gas containing SO ₂ gas from the inlets and mechanical strength near the inlets There was a problem of lowering.
[0006]
2) In this method, it is necessary to transport and throw ingots having a weight of 2 to 5 kg. However, mechanization is difficult, and manual feeding and throwing are common. However, this work is a work near the smelting furnace having a furnace temperature of about 1300 ° C., and the working environment was poor.
[0007]
[Problems to be solved by the invention]
An object of the present invention is to provide a method for operating a copper smelting furnace that efficiently dissolves a wider range of buildup in a copper smelting furnace in which the sum of the slag layer and the mat layer is 0.5 m or more. .
[0008]
[Means for Solving the Problems]
Therefore, the following invention is proposed.
(1) In a copper smelting furnace in which the sum of the slag layer and the mat layer is 0.5 m or more, metal particles having a particle size of 2 to 30 mm and containing metallic Fe of 50 to 95 mass% and C of 1 to 5 mass% From above, the Fe ₃ O ₄ formed on the bottom of the furnace is added to the slag hot water surface toward the build-up including Fe ₃ O ₄ formed on the furnace bottom as the main component. A method for operating a copper smelting furnace that efficiently dissolves and removes buildup.
(2) A method for operating a copper smelting furnace in which the metal particles described in (1) are introduced at a rate of 0.15 g / cm ² or more per second from above the slag hot water surface.
(3) A method for operating a copper smelting furnace, wherein the Cu quality of the metal grains described in the above (1) to (2) is 35 mass% or less.
(4) A method for operating a copper smelting furnace in which the metal particles described in the above (1) to (3) are metallic iron containing copper obtained by melting and reducing general waste or industrial waste.
[0009]
Hereinafter, the configuration of the present invention will be described in detail.
In the present invention, the target furnace is a copper smelting furnace in which the total of the slag layer and the mat layer is 0.5 m or more. For example, a flash smelting furnace in a flash smelting furnace method or a smelting furnace.
This is because if the layer is thinner than 0.5 m, the diffusion of the metal particles in the layer is hindered and the range of build-up to be dissolved is narrowed.
[0010]
The metal particles used preferably have a particle size of 2 to 30 mm. With this particle shape, the reactivity and diffusibility are good, and it is a necessary condition for facilitating the mechanization of transportation and charging.
[0011]
Moreover, a composition is a thing containing metallic Fe50-95 mass% and C1-5 mass%. This is because the composition within this range is excellent in reactivity. The reason why carbon is essential here is that the melting point of the iron alloy is lowered and the reactivity in the copper smelting furnace is increased when carbon enters.
A thing containing valuables, such as Cu, will lead to recovery of valuables, and is more suitable. However, it is desirable that the Cu quality is 35 mass% or less. This is because when it is 35 mass% or more, the iron component and the carbon component are reduced, and the reduction effect to build-up is weakened. More preferably, it is 20 mass% or less. This is to increase the reduction effect to build-up.
[0012]
Examples of the metal particles having the above composition include metallic iron containing copper obtained by melting and reducing general waste or industrial waste. More specifically, metal particles generated from "general waste direct melting / resource plant", for example, iron particles containing carbon and copper (metallic Fe: about 75 mass%, C: about 2.5 mass%, Cu: about 3.5 mass%).
This is because they are not only inexpensive, but also provide a copper recovery effect.
[0013]
It is necessary that the metal particles be introduced onto the slag hot water surface from above the slag hot water surface at a rate of 0.15 g / cm ² or more per second. This is a necessary condition for allowing metal particles having a particle diameter of 2 to 30 mm to reach the furnace bottom and efficiently dissolving the buildup mainly composed of Fe ₃ O ₄ .
[0014]
Further, it is desirable that the charging time per charging port is 5 seconds to 20 minutes, and the charging interval is 10 minutes to 1 hour. This is because if more than the required amount of metal particles is added, the bottom of the furnace may be damaged. Usually, it is desirable to have 2 to 5 input ports. This is because the parts forming the build-up are spreading, and it is desirable that the metal particles hit the corresponding parts accurately and react.
[0015]
[Action]
According to the present invention, it is possible to efficiently dissolve the buildup mainly composed of Fe ₃ O ₄ formed at the bottom of the copper smelting furnace, maintaining the effective volume in the holding container, It is possible to stabilize the melt flow and efficiently separate the specific gravity of the mat and slag.
[0016]
【Example】
In this example, the brick inner diameter is 10 m, the bath depth is 1.5 m, and the build-up thickness average is 700 mm
Copper smelting slag Cu 1.3 _mass% of the ceiling brick bottom distance 1.2m from the slag layer _{surface, Fe 45mass%, Fe 3 O} 4 10mass%, a slag treatment in the copper smelting to recover the SiO 2 29mass% settling was Cu Conducted in an electric furnace.
[0017]
As shown in Fig. 2, the build-up is dissolved at a point A at a distance of 2 m from the inner surface of the brick to the center and a point B at a distance of 1 m from the point A to the center. And measured the distance from the ceiling to the top of the buildup.
[0018]
From point A, the particle size is 2-30mm. Metallic Fe 75mass%, C 2.5mass%, Cu 3.5mass% of metal particles generated from "general waste direct melting and resource plant" at a rate of 400-700g per second. A 5 kg charge was made every 15 minutes. An average of 20 kg input per hour was continued for 2 days.
Table 1 shows the build-up height measured by the above-mentioned stale rod. The height at the start of charging was set to 0 as a reference, and measurement was performed in units of 50 mm. -Means buildup dissolution.
[0019]
[Table 1]

Although there was a delay of 4 to 8 hours, almost the same build-up dissolution was confirmed at point B, which is 1 m away from the point A of the pig iron grain injection point.
[0020]
[Comparative example]
This comparative example is the same as the example, brick inner diameter 10 m, hot water depth 1.5 m, build-up thickness average 700 mm, slag Cu bottom surface distance 1.2 m from the slag layer surface Cu smelting Cu 1.3 mass%, Fe45 mass%, Fe ₃ O ₄ 10 mass% and SiO ₂ 29 mass% were set and implemented in an electric furnace for copper smelting to recover Cu. The measurement of the build-up dissolution status was also performed in the same manner as in the example.
[0021]
From point A, a pig iron ingot having a weight of about 5 kg per piece having a shape of about 50 mm × 100 mm × 15 mm, a composition of metallic Fe93 mass%, and C 4 mass% was introduced every 15 minutes. An average of 20 kg input per hour was continued for 2 days.
Table 2 shows the build-up height measured with the above-mentioned stale rod. The height at the start of charging was set to 0 as a reference, and measurement was performed in units of 50 mm. -Means buildup dissolution.
[Table 2]

The build-up dissolution proceeded at almost the same speed as the example at the point A, but at the point B, the build-up dissolution of 250 mm was confirmed after 48 hours in the example, but the dissolution was stopped at 50 mm in the comparative example. .
[0022]
【The invention's effect】
By implementing the present invention, the following effects are obtained.
(1) A wide range of buildups can be efficiently dissolved and removed.
(2) Build-up melting work can be mechanized if the particle size, bulk specific gravity, charging speed, etc. of the metal particles are set to appropriate conditions, and build-up at a point 1 m away from the charging point can be efficiently dissolved. Can be removed.
(3) It is possible to prevent the work environment from deteriorating during buildup dissolution.
[Brief description of the drawings]
FIG. 1 is an aspect of the present invention and shows a melting state of a buildup portion in a smelting furnace.
FIG. 2 shows a state of measurement of a build-up dissolution condition that is an example of the present invention.
FIG. 3 illustrates one aspect of the prior art.

Claims (4)

In the copper smelting furnace in which the total of the slag layer and the mat layer is 0.5 m or more, the metal particles having a particle size of 2 to 30 mm and containing metallic Fe of 50 to 95 mass% and C of 1 to 5 mass% from above the slag hot water surface, The Fe formed on the bottom of the furnace is poured onto the slag surface toward the bottom deposit (hereinafter referred to as build-up) mainly composed of Fe ₃ O ₄ formed on the bottom of the furnace. _A method for operating a copper smelting furnace, which efficiently dissolves and removes a buildup containing ₃ O ₄ as a main component. A method for operating a copper smelting furnace, wherein the metal particles according to claim 1 are introduced at a rate of 0.15 g / cm ² or more per second from above the slag hot water surface. A method for operating a copper smelting furnace, wherein the Cu quality of the metal grains according to claim 1 is 35 mass% or less. 4. The method for operating a copper smelting furnace, wherein the metal particles according to claim 1 are metal waste containing copper obtained by melting and reducing general waste or industrial waste.

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