JPH11181534A - Method for removing remaining molten material in copper-making furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a removing method of a remaining molten material in a copper-making furnace, by which the remaining molten metal can easily be removed from a furnace bottom part, the demolishing in the furnace bottom and the changed laying work of brick on the furnace hearth can easily be executed, the drastic improvement of the furnace operating rate can be obtd., operator's working load can be reduced to a large extent and further, the inspection work in the furnace hearth can smoothly and surely be executed. SOLUTION: At the time of taking out the molten material from the furnace bottom part, oxygen is positively supplied onto the molten material remaining in the furnace bottom part by blowing the oxygen-enriched air through a lance 5b from the upper part of the molten material, and this molten material is oxidized or slagged and also, the molten material is effectively stirred and the temp. at each part of the molten material is uniformly raised and the molten material is taken out from the furnace bottom part as much as possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copper furnace for removing a solution remaining at the bottom of a furnace for inspecting, disassembling and relocating a hearth brick at the time of furnace repair of a stationary copper furnace. The present invention relates to a method for removing a residual solution.

[0002]

2. Description of the Related Art For example, when refining metal sulfide ore in a continuous copper smelting method, as shown in FIG. And kawa M mainly composed of iron sulfide and karmic S mainly composed of gangue, solvent, iron oxide and the like in the raw material, and then the karami S and kawa M are separated in the separation furnace 2. ,continue,
The copper M is oxidized in the copper making furnace 3 to obtain crude copper C, and the crude copper C is refined in the refining furnace 4 to produce refined copper with higher copper quality. The smelting furnace 1 and the copper making furnace 3 are provided with lances 5a and 5b having a double tube structure so as to be able to move up and down through the ceiling of these furnaces. Copper concentrate, oxygen-enriched air, solvents, coolant, etc. are supplied into each furnace via the furnace. The separation furnace 2 is, for example, an electric furnace provided with the electrodes 6. The smelting furnace 1, the separation furnace 2, and the copper making furnace 3 are provided with a height difference in this order, and are connected by gutters 7a and 7b, which are flow paths of the solution.

[0003]

In a smelting furnace such as the smelting furnace 1 or the copper making furnace 3 described above, a bottom removing device is provided for extracting the solution remaining in the furnace bottom during furnace repair. (See, for example, Japanese Patent Application No. 2-314680). However, even if this bottoming device is used,
There was a problem that it was difficult to completely extract the solution inside the furnace. Conventionally, a solution remaining at the bottom of the furnace and unable to be extracted has been cooled and solidified, and then removed by mechanical means relying on manual labor of an operator. In this case, in the copper making furnace 3 in which the residual solution is blister copper, it is difficult to easily remove the residual solution, and the residual solution is blown and removed by a jet lance. However, there is a problem that the work environment is poor and a burden is imposed on a worker. Further, in the copper making furnace 3, there was a complaint that the state of the hearth could not be checked because the residual solution could not be easily separated from the hearth. The present invention has been made in view of the above circumstances. It is an object of the present invention to easily remove a residual solution from a furnace bottom, and to easily disassemble a hearth and reload a hearth brick. Can significantly improve the furnace operation rate and greatly reduce the burden on workers, while ensuring that furnace hearth inspection work can be performed smoothly and reliably. It is an object of the present invention to provide a method of removing a residual solution in a copper making furnace.

[0004]

Means for Solving the Problems A first aspect of the present invention is to remove a residual solution in a copper making furnace for removing a solution remaining in a furnace bottom when inspecting, dismantling, or transferring a hearth brick. A method for removing the solution from the furnace bottom by blowing oxygen-enriched air from above the solution with a lance. As a result, oxygen is positively supplied to the solution remaining at the bottom of the furnace to oxidize and calm the solution, and the solution is effectively stirred to uniformly raise the temperature of each part of the solution to cool the solution. Pull out as much as possible from the bottom. According to a second aspect of the present invention, the height of the lance is set to 0.5 to 2 m from the solution surface. The reason for this setting is that if the lance height is less than 0.5 m, the lance may be blocked by the splash, and the hearth brick may be damaged when only the hearth inspection is performed. On the other hand, when the lance height is higher than 2 m, the reaction efficiency is reduced, and the solution is cooled and solidified without obtaining a sufficient reaction. Furthermore, in the third aspect of the present invention, the oxygen concentration of the oxygen-enriched air blown by the lance is set to 40 to 70%. The reason for this setting is that when the oxygen concentration is lower than 40%, the solution does not react sufficiently and the solution solidifies. On the other hand, when the oxygen concentration is higher than 70%, the heat of reaction is high and the lance is melted. This is because there is a great risk of loss. Furthermore, in claim 4 of the present invention, the flow rate of the oxygen-enriched air blown by the lance is set to 130 to 150 Nm / s. The reason for this setting is that the flow rate of the oxygen-enriched air is 1
If it is lower than 30 Nm / s, the required reaction efficiency cannot be ensured, and the solution cannot be sufficiently stirred. On the other hand, if the flow rate of the oxygen-enriched air is higher than 150 Nm / s, the cooling jacket will not melt due to the splash. This is because there is a risk of causing damage and, if only the hearth inspection is performed, the hearth may be damaged. According to a fifth aspect of the present invention, when extracting the solution from the furnace bottom, the inside of the furnace is heated by a burner. Thereby, the atmosphere in the furnace is heated to accelerate the oxidation reaction of the solution, and the splash attached to the furnace wall is melted and dropped into the solution at the bottom of the furnace. According to a sixth aspect of the present invention, after the oxygen-enriched air is blown onto the solution, the solution is cooled and solidified, and the solidified solution is crushed and removed. In this case, since the residual solution is sufficiently oxidized and karmicified, the solidified solution is fragile and easily broken.

[0005]

Embodiments of the present invention will be described below with reference to FIG. Following the operation of extracting the solution from the bottom opening 10 formed in the furnace bottom of the copper making furnace 3, two to five lances 5b relatively close to the furnace center among the eight lances 5b used in normal operation. Is used as it is, and the height of each of the lances 5b is readjusted in response to the lowering of the solution surface, and a gas flow rate similar to that in normal operation and an oxygen concentration higher than normal are obtained from these lances 5b. To oxidize the solution remaining at the bottom of the furnace. If necessary, auxiliary combustion (heating of the furnace atmosphere) using a heavy oil burner is performed, but in this case, addition of a flux is unnecessary. The height of each lance 5b is 0.5 to 2 from the solution surface.
m. This is because the lance height is 0.5
If it is lower than m, the lance 5b may be too close to the solution surface, so that the lance 5b may be closed by the splash, and the hearth brick may be damaged when only the hearth is inspected. is there. On the other hand, if the lance height is higher than 2 m, the reaction efficiency decreases, the temperature of the solution cannot be sufficiently increased, and the solution is cooled and solidified. The oxygen concentration of the oxygen-enriched air blown by the lance 5b is set to 40 to 70%. The reason is that if the oxygen concentration is lower than 40%, the solution does not react sufficiently and the solution solidifies, whereas if the oxygen concentration is higher than 70%, the reaction heat is high and the lance 5b may be melted. Because it is big. The flow rate of the oxygen-enriched air blown by the lance 5b is set to 130 to 150 Nm / s. This is because the flow rate of the oxygen-enriched air is 130
If the flow rate of the oxygen-enriched air is higher than 150 Nm / s, the cooling jacket due to splash cannot be obtained if the flow rate of the oxygen-enriched air is higher than 150 Nm / s. When performing only hearth inspection,
This is because the hearth may be damaged.

In this manner, when oxygen-enriched air is blown onto the solution using the lance 5b, the solution is oxidized and karmicized, and the solution is agitated, so that the temperature of each part of the solution is made uniform and the bottom of the solution becomes uniform. It becomes easier to extract the solution from the outlet 10. Therefore, the amount of the solution remaining in the furnace bottom can be suppressed smaller than in the conventional case. Then, the bottom opening 1 of this solution
When the extraction operation from zero is completed, the solution still remaining at the furnace bottom is cooled and solidified, and the solidified solution is crushed and removed. In this case, since the residual solution is sufficiently oxidized and karmicified, the solidified solution is fragile and easily crushed, so that an operator can easily remove it. As a result, the hearth can be dismantled in a short time and the hearth bricks can be smoothly transferred. For example, while the conventional method required about 20 days to disassemble the hearth, according to the method of the present invention, the hearth can be dismantled with 6 to 7 days (about 1/3) of labor. Was. In addition, when inspecting the hearth only without disassembling or relocating the hearth, the operator should visually check the state of the hearth simply by removing the oxidized and calcined residual solution. Can be. In this case, since the residual solution is easily removed and the hearth is not damaged, only the inspection of the hearth state can be reliably performed without performing extra work such as repair of the hearth.

[0007]

According to a first aspect of the present invention, there is provided a method for removing a residual solution in a copper making furnace for removing a solution remaining in a furnace bottom when inspecting, dismantling, or transshipping a hearth brick. Then, when extracting the solution from the furnace bottom, oxygen-enriched air is blown from above the solution by a lance, so that oxygen is actively supplied to the solution remaining in the furnace bottom to remove this solution. By oxidizing and karmicifying and effectively stirring the solution, the temperature of each part of the solution can be raised uniformly, and the fluidity of the solution can be improved.
The solution can be easily extracted from the furnace bottom. Also,
According to the second aspect of the present invention, by setting the lance height to 0.5 to 2 m from the solution surface, it is possible to prevent the lance from being closed by splash,
When only the hearth inspection work is performed, it is possible to prevent the hearth brick from being damaged, but it is also possible to cause a sufficient reaction and to surely prevent the solution from cooling and solidifying. Oxidation and lamination of the solution can be realized smoothly.
Further, according to the third aspect of the present invention, by setting the oxygen concentration of the oxygen-enriched air blown by the lance to 40 to 70%, sufficient heat of reaction can be obtained to prevent solidification of the solution. On the other hand, melting of the lance can be prevented, and the reaction can be smoothly and reliably continued. . Furthermore, according to claim 4 of the present invention, the flow rate of the oxygen-enriched air blown by the lance is set to 13
By setting the pressure to 0 to 150 Nm / s, the required reaction efficiency can be easily maintained, and the solution can be sufficiently stirred, while the cooling jacket can be prevented from being damaged by splash, and When only the hearth inspection is performed, the solution in the hearth can be smoothly removed without damaging the hearth. According to claim 5 of the present invention, when extracting the solution from the furnace bottom, by heating the inside of the furnace with a burner, it is possible to warm the atmosphere in the furnace and promote the oxidation reaction of the solution, and The reaction in the furnace can be stably continued, and the splash attached to the furnace wall can be melted and dropped into the solution at the furnace bottom, while the temperature of the solution remaining at the furnace bottom is raised to increase the temperature of the solution. Fluidity can be improved. According to a sixth aspect of the present invention, after the oxygen-enriched air is sprayed on the solution, the solution is cooled and solidified, and the solidified solution is crushed and removed. The solidified solution is fragile and easily crushed due to being sufficiently oxidized and karmicified. Therefore, the work of removing the solidified solution from the hearth can be easily performed, and the hearth can be reliably prevented from being damaged. In addition, the hearth inspection, hearth demolition, and transshipment work can be performed. It can be performed smoothly, and excellent effects such as shortening of work time, reduction of the number of workers, improvement of operation rate, and reduction of burden on workers can be achieved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of a continuous refining apparatus for copper.

[Explanation of symbols]

 C Bronze 3 Copper making furnace 5b Lance 10 Bottom opening

Claims (6)

[Claims] 1. A method for removing a residual solution in a stationary copper making furnace for removing a solution remaining in a furnace bottom when inspecting, dismantling, or transshipping a hearth brick. A method for removing a residual solution in a copper making furnace, comprising blowing oxygen-enriched air from above the solution with a lance when extracting the solution from the furnace bottom. 2. The method according to claim 1, wherein the height of the lance is set to 0.5 to 2 m from the surface of the solution. 3. The method for removing a residual solution in a copper making furnace according to claim 1, wherein the oxygen concentration of the oxygen-enriched air blown by the lance is set to 40 to 70%. 4. The method for removing a residual solution in a copper making furnace according to claim 1, wherein the flow rate of the oxygen-enriched air blown by the lance is set to 130 to 150 Nm / s. 5. The method according to claim 1, wherein the inside of the furnace is heated by a burner when extracting the solution from the furnace bottom. 6. The method according to claim 1, wherein after the oxygen-enriched air is blown onto the solution, the solution is cooled and solidified, and the solidified solution is crushed and removed. The method for removing a residual solution in a copper making furnace as described in the above.