JPH11189830A - Matte trough for flash smelting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the trough having a long service life and effective in enhancing the durability of a ladle by arranging plural copper blocks provided with a through-hole through which cooling water flows in the depth direction of the trough to surround a carbon brick having a U-shaped groove. SOLUTION: The matte trough 20 is composed of the carbon brick 21 having a U-shaped groove 22 and plural copper blocks 23 to 27 assembled to surround the periphery of the groove 22 except its opening. The outside of the blocks 23 to 27 is fixed by the fixing members 28 and 29 at an appropriate interval. In this case, only one block is preferably arranged under the bottom of the carbon brick and >=1 block on the side faces. Through-holes 23a to 27a are formed in the blocks 23 to 27, and cooling water is passed through the through- holes to cool the carbon brick 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a mat gutter used in a flash smelting furnace in a copper smelting process.

[0002]

_2. Description of the Related Art Conventionally, a copper smelting process has been carried out by flotation of chalcopyrite (CuFeS ₂ ), which is a major copper ore, by 25-35.
% And fine ore Cu, after formulating the flux of SiO ₂ or the like,
Generally, it is made into blister copper through a matte by dry oxidation smelting, and into electrolytic copper by electrolytic refining. In the process of concentrating this mat, a flash furnace is usually used, and FeS co-existing with Cu is oxidized into slag, and the Cu grade is 50 ~.
The mat is about 70%.

As shown in FIGS. 2 and 3, this flash smelting furnace has a reaction shaft 2
And an uptake 3 are provided. Then, the flash dried ore is charged into the reaction shaft 2 and oxidized and melted by air or oxygen-enriched air at a high temperature of 1200 to 1300 ° C., and the mat and the slag are separated in the furnace body 1 by a specific gravity difference. To separate.

A mat in a molten state is batch-extracted from a plurality of tap holes 4 (having a diameter of 30 to 50 mmφ) provided near a furnace bottom in the longitudinal direction of the furnace body 1 to a ladle 6 through a mat gutter 5. It is. This mat is further oxidized in a converter in the next step to form a blister having a copper grade of 98% or more. On the other hand, the slag in a molten state flows out from a slag hole 7 provided at an upper portion in the width direction of the furnace main body 1 to a smelting furnace or a granulating process via a slag gutter 8.

The exhaust gas generated in the furnace body 1 is discharged out of the furnace from the uptake 3. However, since it contains dust in addition to the high-concentration SO ₂ gas, the dust is removed by a cyclone or cotrel. After the treatment, it is sent to the sulfuric acid factory in the next process and converted into sulfuric acid. FIG. 4 is a sectional view showing an example of a conventional mat gutter used in the above-mentioned flash smelting furnace. The mat gutter 5 has a semicircular iron plate 51 on the outer surface and a semicircular copper plate 52 on the inner surface, and welds them together at the P portion by brazing or the like to form a jacket 53 and cool with water. And a groove 55 for flowing the mat inside the copper plate 52
A carbon brick 54 having an opening width W of about 150 mm is lined.

Japanese Patent Publication No. 56-34621 discloses a continuous or semi-continuous cast copper integrated gutter having four water supply holes formed therein.

[0007]

However, these mat gutters have the following problems, which cause an increase in operating costs. In the former,
Water leakage from the jacket is apt to occur, and the cooling capacity for carbon bricks is reduced accordingly. Therefore, the life of carbon bricks is as short as about 150 taps per tube (about one month in normal operation). Therefore, a large number of man-hours were required for repair and replacement of the jacket and the carbon brick, resulting in an increase in equipment costs.

[0008] In the latter case, the high-temperature mat to be fed is in direct contact with the gutter body provided with the cooling water holes, so that there is a danger of steam explosion due to water leakage. -In order to be exchangeable or to manufacture as an integral casting, a special casting technique is required from the viewpoint of securing the strength of the gutter, and there have been problems in terms of equipment costs and gutter manufacturing costs. further,
As a problem common to the former and the latter, the cross-sectional area is small due to the semicircular shape of the flow path of the mat, the flow velocity of the mat flowing out of the mat gutter increases to 1.1 to 1.5 m / s, and the meat of the ladle 6 receiving the mat is increased. Since the molten mat directly hits the thin side and erodes, it needs to be repaired.

The present invention solves the above-mentioned problems of the prior art and provides a mat gutter for a flash furnace which has a long life and is effective for improving the durability of a ladle. Aim.

[0010]

Means for Solving the Problems As a result of repeated studies and experiments to solve the above problems, the present inventors have found that there is no danger of steam explosion due to water leakage, and there is no danger for the components of the mat flow path. It is necessary to increase the cooling capacity and to allow repair and replacement within the minimum necessary range, increase the wet area in the cross section of the mat flow path, increase the flow resistance of the mat and suppress the mat outflow speed It has been found out that it is necessary to set the mat drop position on the ladle to the bottom of the ladle, and have completed the present invention.

That is, the present invention relates to a mat gutter used for taking out a mat of a flash smelting furnace, wherein a carbon brick having an upward U-shaped groove and a through-hole through which cooling water flows are provided. A plurality of copper blocks, wherein the copper blocks are arranged in the depth direction of the gutter so as to surround the periphery of the carbon brick.

It is preferable that one copper block is disposed on the bottom surface of the carbon brick and one or more copper blocks are disposed on each side surface of the carbon brick. Is preferably set to 1.5 to 2.5.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the present invention. As shown in this figure, the mat gutter 20 of the present invention has a groove with a U-shape facing upward.
And a plurality of copper blocks 23, 2 assembled around the periphery other than the opening of the groove 22.
4, 25, 26, 27. These copper blocks 23-2
The outside of 7 is fixed at appropriate intervals by fixing members 28 and 29.

Here, it is preferable that one copper block is disposed on the bottom surface of the carbon brick, and one or more copper blocks are disposed on each side surface. The reason for this is that when constructing the entire gutter on site, the copper block to be placed on the side can be easily positioned, and local repair and replacement during use can be done with less man-hours and easily. Because it can be. FIG.
In the figure, an example is shown in which the number of the bottom surface is one and each side surface is two.

Next, through-holes 23a to 27a are previously formed in the copper blocks 23 to 27, respectively, and by flowing cooling water through the through-holes 23a to 27a, the carbon bricks 21 are cooled to raise the temperature. To be suppressed. This eliminates the need for a welded portion such as the conventional jacket 53, so that there is no risk of causing a water leakage accident. Since the entire block is integrally formed of copper, it goes without saying that the cooling effect can be maintained at a level equal to or higher than that of the conventional example. Further, since each copper block can be manufactured as a small casting, it can be easily manufactured without requiring a special casting technique.

The ratio w / h of the opening width w and the opening depth h of the groove portion 22 of the carbon brick 21 is increased from about 1.1 in the related art.
The flow rate of the mat is set to 0.5 to 2.5 by increasing the opening width of the groove 22 as the mat flow path.
It can be as slow as about 1.0m / s. As a result, the mat can be dropped directly onto the bottom of the thicker ladle, so that the mat does not collide with the side wall of the ladle and the life of the ladle can be extended.

[0017]

EXAMPLE An operation was performed using the mat gutter 20 of the present invention in which the ratio w / h of the opening width w and the opening depth h of the groove 22 of the carbon brick 21 was 2.0. As a result, there is no water leakage, and one mat gutter can be used up to 450 times / tap (about 3 months in normal operation), which is the usage limit of carbon brick 21. The service life can be extended three times. In addition, as a result of flattening the bottom surface of the groove portion 22 of the carbon brick 21, after tapping the mat, care to remove the mat adhered to the gutter became easy, and the secondary effect that the number of care steps was reduced was obtained. .

Further, as a result of suppressing the erosion of the side wall by dropping the mat with the outflow speed almost halved directly to the bottom of the ladle, the number of ladle cares becomes 30 in one year. Was halved compared to 60 a year.

[0019]

As described above, according to the mat gutter of the present invention, a plurality of through-holes through which cooling water flows are formed around a carbon brick having an upward U-shaped groove. Since it is configured to be surrounded by individual copper blocks, there is no danger of water vapor explosion due to water leakage, and it is possible to increase the cooling effect, extend the life of the gutter, and suppress the outflow speed of the mat This has an excellent effect of extending the life of the ladle.

Further, since the copper block is a small casting, it can be easily manufactured, and since a plurality of copper blocks are arranged in the depth direction of the gutter, only the damaged portion can be repaired and replaced. The effects are particularly remarkable, such as reduction in the number of repair man-hours and equipment costs.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a front view showing a conventional example of a flash smelting furnace.

FIG. 3 is a view as viewed in the direction of arrows AA in FIG. 2;

FIG. 4 is a sectional view showing a conventional example of a mat gutter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace main body 2 Reaction shaft 3 Uptake 4 Tap hole 5 Mat gutter (conventional) 6 Ladle 7 Slag hole 8 Slag gutter 20 Mat gutter (the present invention) 21 Carbon brick 22 Groove 23-27 Copper block 23a-27a Through hole 28, 29 Fixing member 51 Iron plate 52 Copper plate 53 Jacket 54 Carbon brick 55 Groove

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Makoto Hamamoto 6-1-1 Hibi, Tamano-shi, Okayama Mitsui Kinzoku Mining Co., Ltd.

Claims (3)

[Claims] 1. A mat gutter used for extracting a mat of a flash furnace, comprising: a carbon brick having an upward U-shaped groove; and a plurality of through holes provided with through holes for flowing cooling water. A mat gutter for a flash furnace, comprising a copper block, wherein the copper block is disposed in a gutter depth direction so as to surround a periphery of the carbon brick. 2. The mat gutter for a flash furnace according to claim 1, wherein one or more copper blocks are arranged on a bottom surface of the carbon brick and one or more copper blocks are arranged on each side surface. 3. The mat gutter for a flash furnace according to claim 1, wherein a ratio w / h of an opening width w and an opening depth h of the groove in the carbon brick is 1.5 to 2.5.