JPH01294832A - Continuous smelting apparatus for metallic sulfide ore - Google Patents

Abstract

PURPOSE:To continuously measure temp. at slag tapping hole side by arranging small hole in a roof near the slag tapping hole side in a smelting furnace, parting interval between the small hole and a lance with projection-state and arranging means for measuring temp. of the slag under non-contacting method through the small hole. CONSTITUTION:In a continuous refining apparatus for metallic sulfide ore, the lance 7 is hung down from the roof wall part 6a in the smelting furnace 6. The small hole 6c penetrating into the furnace 6 is formed at the roof wall part 6a near the slag tapping hole 10a. The projection-state wall part 6a is formed at inner surface of the roof wall part 6a to part the small hole 6c with the lance 7 side. A plate 12 having small hole 12a is fixed to the small hole 6c, and a shifting plate 13 having small hole 13a is laid on the plate 12. The noncontacting radiation thermometer 14 is arranged above the shifting plate 13 to measure the temp. of the slag 40 just flowing out from the slag tapping hole 10a. By this method, as the molten metal spattered with the air, etc., injected from the lance 7 is dammed up with the wall part 6d and the small hole 6c is not clogged, the temp. of the slag 40 can be continuously and stably measured.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is directed to smelting sulfur sulfide, which is smelted while controlling the temperature inside the furnace to a predetermined value by continuously measuring the temperature of the grain inside the smelting furnace. This relates to a continuous smelting device for metal ores.

[Prior Art] This type of continuous smelting equipment for metal sulfide ore is used for smelting blister copper, for example, by melting copper concentrate to about 65%.
a smelting furnace for producing copper-based kat and silicate (Side) and ferrite-based karami; a separation tank for separating kat and karami produced in the smelting furnace; It is equipped with a steel smelting furnace (smelting furnace) that further separates iron (Fe) from the steel separated in the tank as a karami mainly composed of calcium oxide (CaO) ferrite and smelts 98 to 99% blister copper. things are known. and,
In order to smelt blister copper with the best efficiency, the temperature inside the copper making furnace is controlled to be constant by measuring the temperature on the outlet side of the column in the copper making furnace. Conventionally, the temperature of the karami has been measured using an optical pyrometer or the like after a predetermined period of time has elapsed, with an operator opening the lid of a through hole formed above the gutter at the karami outlet.

[Problems to be Solved by the Invention] As described above, in the above-mentioned conventional continuous smelting apparatus, the temperature inside the smelting furnace is determined by intermittently measuring the temperature of the karami flowing through the gutter at the karami outlet in the copper making furnace. 1, for this reason,
Conventionally, there has been a desire to continuously measure the temperature of the upstream steelmaking furnace to more stably control the temperature inside the steelmaking furnace.

However, if you try to continuously measure the temperature of the gutter with a non-contact @ thermometer with the through hole open, if the diameter of the through hole is large, the temperature inside the gutter will drop and the gutter will flow. This has the disadvantage that it becomes difficult to use, and furthermore, once the sludge has solidified, it requires a great deal of energy and effort to melt it. In addition, if the diameter of the above-mentioned through-hole is small, when cleaning the level inside the gutter from time to time, the molten metal will be scattered by the jet lance, and this scattered molten metal will fly to the through-hole, cool and solidify, and the through-hole will be It had the disadvantage of being blocked. In addition, when directly measuring karami with a thermocouple, etc., the thermocouple is placed in the flow of karami, and the karami is highly erosive and contains CaO ferrite as its main component. The disadvantage was that the protective tube would melt away within a few hours.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and provide a continuous smelting apparatus for metal sulfide ore, which can continuously measure the temperature on the outlet side of a smelter in a smelting furnace.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a small hole penetrating into the furnace in the ceiling wall near the outlet of the smelting furnace, and A protruding wall portion separating the lance side and the small hole side is formed on the inner surface of the ceiling wall portion between the lance and the small hole provided so as to hang down toward the molten metal in the central part of the view, It is characterized in that a non-contact thermometer is provided on the outside of the furnace in the wall portion to measure the temperature of the inside of the furnace through the small hole.

[Function] In the present invention, the molten metal scattered by the air ejected from the lance is blocked by the wall and does not fly near the small hole. Therefore, the small hole is not blocked and the penetrating state of the small hole is maintained for a long period of time. Furthermore, since the diameter of the small holes is small, the amount of leakage from the small holes is small, and the temperature inside the furnace does not drop.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. However, in this example, a case is shown in which copper concentrate is used as the metal sulfide ore.

In FIG. 1, l is a smelting furnace, and this smelting furnace l is
Copper concentrate supplied from Lance 2 is melted to produce Kawa 3, which has a high specific gravity and whose main component is about 65% copper, and silicate (
Show) This produces a low-density karami 4 whose main component is ferrite. The ash 3 and karami 4 produced in the smelting furnace 1 are arranged to further flow continuously into a separation tank 5. Separation tank 5 contains Kawa 3 and Karami 4.
The steel 3, which has a large specific gravity and has sunk to the bottom, flows into the steelmaking furnace (smelting furnace) 6 by the siphon principle, and the steel 4 floating on top of the steel 3 flows through the steel discharge port 5.
It is designed to be discharged from a.

The steelmaking furnace 6 oxidizes the steel 3 separated in the separation tank 5,
The iron content in Kawa 3 is replaced by calcium oxide (CaO), which has a low specific gravity.
) Separated as Karami 40 whose main component is ferrite,
It produces 98-99% crude steel 3o.

As shown in FIGS. 2 and 3, this copper making furnace 6 is formed in the shape of a sealed cylindrical container, and has a ceiling wall 6a at the center in a plan view toward the molten metal. A lance 7 is provided so as to hang down. This lance 7 blows air containing various amounts of oxygen onto the molten metal together with powdered lime. Further, in the peripheral wall portion 6b of the copper making furnace 6, as shown in FIG. At the same time, blister copper outflow channels 9 are provided at positions 1 and 72 rotated by approximately 45 degrees at the central angle of the steelmaking furnace 6 with respect to the blister inflow channel 8, through which blister copper 30 produced in the coppermaking furnace 6 flows out. Further, at a position opposite to the blister inflow path 8 at an angle of about 90° at the center of the steelmaking furnace 6 with respect to the blister copper outflow path 9, there is a sludge discharge path 1 for discharging the sludge 40 floating on the blister copper 30.
0 is set. The blister copper outflow path 9 is configured to flow out the blister copper 30 that has sunk to the bottom of the steelmaking furnace 6 based on the siphon principle. Moreover, the karami discharge path 10 is formed so that the karami exit 10a thereof is formed wide, and the width becomes gradually narrower toward the direction in which the karami 40 is discharged. In addition, a small hole 6c penetrating into the furnace is formed in the ceiling wall portion 6a near the karami outlet 10a, and a small hole 6c penetrating into the furnace is formed on the side of the small hole 6C at a position opposite to the kawara inflow channel 8. A protruding rectangular tube-shaped smoke volume 11 is provided. Further, on the inner surface of the ceiling wall portion 6a, a smoke inflow channel 8 with a smoke amount of 11 is provided.
Along the side edge, the smoke volume 11 and small hole 6C are inserted into lance 7.
A protruding wall portion 6d is formed to separate it from the sides. Further, as shown in FIG. 4, a temporary 12 having a small hole 12a smaller in diameter than the small hole 6c is removably fixed to the small hole 6c from the outer surface side of the ceiling wall 6a. A movable plate 13 is movably mounted on this plate 12, and has a small hole 13a which is smaller in diameter than the small hole 12a and slightly larger in diameter than the measurement field of the radiation thermometer described later. A radiation thermometer (non-contact thermometer) 14 is provided above the moving plate 13 to measure the temperature of the calamari 40 just before it flows out from the calamari outlet 10a through the small hole 13a.

The radiation thermometer 14 measures the temperature by collecting radiation from the object to be measured with a lens and applying it to a series thermocouple.
It is characterized by continuous measurement and good responsiveness.

Next, the operation of the continuous smelting apparatus configured as described above will be explained.

When air or the like is ejected from the lance 7, the molten metal is stirred by the air or the like and the molten metal is scattered in all directions. At this time, the sulfur content of the copper sulfide remaining in the cloth 3 reacts with oxygen to become sulfur dioxide gas (SOW), etc., and the copper quality of the cloth 3 is improved. Here, nitrogen gas, sulfuric acid gas, etc. are drawn under negative pressure with respect to the outside air by the smoke amount 11 and are discharged. In addition, the scattered molten metal is blocked by the wall 6d and does not fly to the smoke volume 11 and the opening on the inside of the furnace of the small hole 6C, and the smoke m
The openings of ll and small hole 6c are not obstructed.

In addition, since the inside of the copper making furnace 6 is under negative pressure due to the amount of smoke 11, the small hole 1 of the movement tlj+3 provided in the small hole 6C
Outside air flows in from 3a, but since the diameter of the small hole +3a is extremely small, the amount of air flowing in is extremely small. The small hole 6c, the small hole 12a, or the small hole 13a is not blocked by the John.

In the continuous smelting apparatus configured as described above, the molten metal does not fly into the smoke volume 11 and the openings inside the furnace of the small holes 6c and block these openings, so the smoke volume 1
It is possible to stably discharge sulfur dioxide gas etc. from 1, and the radiation thermometer 14 from the small hole 6c to the column 40
The temperature of the column 40 can be continuously and stably measured without disturbing the measurement field of view. Moreover, the small hole 6c is covered with a plate 12 having a small hole 12a, and the moving plate 13 having a small hole 13a with a smaller diameter is placed on the plate 12, so that it can be passed through the small hole I3a into the furnace. The amount of air flowing into the steel making furnace 6 can be extremely reduced, and the drop in temperature inside the steel making furnace 6 can be kept extremely small.

Furthermore, since the amount of air flowing in is extremely small, the small holes 6
c, the occurrence of acrision due to dust sticking to the small hole 12a or 13a can be prevented, and the small hole 6c
Coupled with the fact that the molten metal does not scatter and solidify, the measurement field of the radiation thermometer 13 can be stably secured over a long period of time. Further, even if an acrision occurs in the small hole 6c, etc., the acrision can be easily removed by shifting the plate 12 laterally, which is extremely convenient. Furthermore, since the moving plate 13 is simply placed on the plate 12, even if the small hole 13a of the moving plate 13 is small, the edge of the small hole 13a can be adjusted by moving the moving plate 13. The measurement field of view of the radiation thermometer 14 can be prevented from being obstructed.

[Effects of the Invention] As described above, according to the present invention, the molten metal scattered by the air ejected from the lance is blocked by the wall portion and does not fly near the small hole. For this reason,
The small holes are not blocked by the flying molten metal, and the penetrating state of the small holes can be maintained for a long period of time. Moreover, since the diameter of the small holes is small, the temperature drop in the furnace due to the small holes can be kept extremely small. Therefore, the temperature at the exit side of the smelting furnace can be continuously measured over a long period of time using a non-contact thermometer.

[Brief explanation of the drawing]

1 to 4 are diagrams showing one embodiment of the present invention, in which FIG. 1 is a schematic configuration diagram of a continuous smelting apparatus for metal sulfide ore;
Figure 2 is a cross-sectional view of the steelmaking furnace, and Figure 3 is III-I in Figure 2.
A sectional view taken along line II, and FIG. 4 is an enlarged sectional view showing a small hole portion. l...Smelting furnace, 3,...Kawa, 4.4
0...Karami, 5...Separation tank, 6...
...Copper furnace (smelting furnace), 6a...Ceiling wall section, 13a...Small hole, 6d...Wall section, 7
...Lance, 10a...Karami exit, 13...Radiation thermometer (non-contact thermometer). 30...Blurred copper

Claims (1)

[Scope of Claims] A smelting furnace that melts sulfide metal ore to produce kawa and karami, a separation tank that separates kawa and karami produced in this smelting furnace, and In a continuous smelting apparatus for sulfide metal ore, which has a smelting furnace that further separates karami from ash to improve the quality of the target metal, the smelting furnace has a hole in the ceiling wall near the karami outlet that is penetrated into the furnace. A small hole is provided in the inner surface of the ceiling wall between the small hole and a lance provided in the central part of the smelting furnace to blow out air, etc., so as to hang down toward the molten metal. A protruding wall portion is formed to partition the lance side and the small hole side, and a non-contact thermometer is provided on the outside of the furnace on the ceiling wall portion to measure the temperature of the column inside the furnace through the small hole. A continuous smelting device for sulfide metal ore, characterized in that: