JP3528553B2 - Removal method of residual solution in copper making furnace - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copper-making furnace for removing a molten metal remaining at the bottom of a furnace for inspecting, disassembling, or transshipping hearth bricks when repairing a stationary copper-making furnace. The present invention relates to a method for removing residual solution.

[0002]

2. Description of the Related Art For example, in the case of refining a metal sulfide ore in a continuous smelting method of a copper concentrate, first, as shown in FIG. And Kawa M containing iron sulfide as a main component, and Karami S containing gangue, a solvent, iron oxide, etc. in the raw material as main components, and then separating the Karami S and the Kawa M 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 further purified in the refining furnace 4 to produce refined copper having a higher copper grade. Then, the smelting furnace 1 and the copper-making furnace 3 are provided with lances 5a and 5b having a double pipe structure so as to be vertically movable through the ceilings of these furnaces. Copper concentrate, oxygen-enriched air, solvent, cooling agent, etc. are supplied to each furnace via the above. The separation furnace 2 is an electric furnace equipped with an electrode 6, for example. The smelting furnace 1, the separating 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 for the solution.

[0003]

By the way, in a smelting furnace such as the smelting furnace 1 or the copper smelting furnace 3 described above, there is a bottom removing device for extracting the solution remaining at the bottom of the furnace when the furnace is repaired. Is installed (for example, see 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 molten metal inside the furnace. Then, conventionally, for the solution that remains at the bottom of the furnace and cannot be extracted, after cooling and solidifying the solution, the solution was removed by mechanical means relying on the workers. In this case, in the copper-making furnace 3 in which the residual solution is crude copper, it is difficult to easily remove the residual solution, and the jet lance is used to melt and remove the residual solution. However, there is a problem in that the work environment is poor, the work environment is bad, and the worker is burdened. Further, in the copper-making furnace 3, there has been a complaint that the state of the hearth cannot be inspected because the residual solution cannot be easily separated from the hearth. The present invention has been made in view of the above circumstances, and an object thereof is to easily remove a residual solution from the bottom of a furnace, and to easily dismantle a hearth and to transfer a hearth brick. The furnace operation rate can be significantly improved, and the burden on workers can be significantly reduced, while the hearth inspection work can be performed smoothly and reliably. It is an object of the present invention to provide a method for removing a residual solution in a copper manufacturing furnace that can be performed.

[0004]

According to claim 1 of the present invention, when inspecting, disassembling, or transshipping a hearth brick, the residual solution in a copper-making furnace is removed to remove the solution remaining in the bottom of the furnace. A removal method, wherein when the solution is extracted from the bottom of the furnace, oxygen-enriched air is blown from above the solution with a lance so that at least a part of the residual solution is colored.
Is shall be Mi of. As a result, oxygen is positively supplied to the solution remaining at the bottom of the furnace to oxidize and caramize the solution, and the solution is effectively stirred to uniformly raise the temperature of each part of the solution and remove the solution from the furnace. Pull out from the bottom as much as possible. According to the second aspect of the present invention, the lance height is set to 0.5 to 2 m from the solution surface. If the height of the lance is less than 0.5 m, the lance may be blocked by the splash and the hearth bricks may be damaged when only the hearth inspection work is performed. On the other hand, if the lance height is higher than 2 m,
This is because the reaction efficiency is lowered and the solution is cooled and solidified without sufficient reaction. Furthermore, the third aspect of the present invention sets the oxygen concentration of the oxygen-enriched air blown by the lance 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, while the oxygen concentration is 7%.
This is because if it is higher than 0%, the reaction heat is high and the lance is liable to melt. Furthermore, claim 4 of the present invention
Is the one in which the flow rate of the oxygen-enriched air blown by the lance is set to 130 to 150 Nm / s. The setting was made so that the flow rate of oxygen-enriched air was 130 Nm.
If it is lower than / s, the required reaction efficiency cannot be ensured, and the solution cannot be sufficiently stirred. On the other hand, if the flow rate of oxygen-enriched air is higher than 150 Nm / s, the cooling jacket will melt due to splashing This is because there is a risk of causing a fire and damage to the hearth when only the hearth is inspected. Further, claim 5 of the present invention
Is for heating the inside of the furnace by a burner when extracting the solution from the bottom of the furnace. As a result, the atmosphere in the furnace is warmed to accelerate the oxidation reaction of the solution, and the splash adhered to the furnace wall is melted and dropped into the solution at the bottom of the furnace. Still further, the sixth aspect of the present invention is to blow oxygen-enriched air onto the solution, cool and solidify the solution, and crush and remove the solidified solution. In this case, since the above-mentioned residual solution has been sufficiently oxidized and caramized, the solidified solution is fragile and easily crushed.

[0005]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to FIG. Subsequent to the work of extracting the solution from the bottom outlet 10 formed at the bottom of the copper-making furnace 3, 2 to 5 lances 5b relatively close to the center of the furnace out of the 8 lances 5b used for normal operation Is used as it is, and the height of each of the above-mentioned lances 5b is readjusted in response to the decrease in the solution surface. To blow air to oxidize the solution remaining on the bottom of the furnace. Further, if necessary, auxiliary combustion by a heavy oil burner (heating of the atmosphere in the furnace) is performed, but in this case, addition of flux is unnecessary. The height of each lance 5b is 0.5 to 2 from the solution surface.
It is set to m. The reason for this is that the lance height is 0.5.
If it is lower than m, the lance 5b may come too close to the solution surface, and the splash may block the lance 5b, and the hearth brick may be damaged when only the hearth is inspected. is there. Further, if the lance height is higher than 2 m, the reaction efficiency is lowered, the temperature of the solution cannot be sufficiently raised, 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 for this is that when the oxygen concentration is lower than 40%, the solution solidifies without sufficient reaction, while when the oxygen concentration is higher than 70%, the reaction heat is high and the lance 5b may be melted and damaged. Because it is big. The flow velocity of the oxygen-enriched air blown by the lance 5b is set to 130 to 150 Nm / s. The reason for this is that the flow rate of oxygen-enriched air is 130
This is because if it is lower than Nm / s, the required reaction efficiency cannot be ensured and the solution cannot be sufficiently stirred, and if the flow rate of oxygen-enriched air is higher than 150 Nm / s, the cooling jacket due to splashing. If there is a risk of causing melting damage of the
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 caramelized, and the solution is agitated, so that the temperature of each part of the solution becomes uniform and the bottom of the solution becomes uniform. It becomes easy to draw out the solution from the outlet 10. Therefore, the amount of the solution remaining on the bottom of the furnace can be reduced as compared with the conventional case. Then, the bottom outlet 1 of this solution
When the work of extracting from 0 is completed, the solution still remaining on the bottom of the furnace is cooled and solidified, and the solidified solution is crushed and removed. In this case, since the above-mentioned residual solution has been sufficiently oxidized and caramized, the solidified solution is fragile and easily crushed, so that the worker can easily remove it. As a result, the hearth can be dismantled in a short period of time, and the hearth bricks can be transshipped smoothly. For example, conventionally, it took about 20 days to dismantle the hearth, but according to the method of the present invention, the hearth can be dismantled with labor of 6 to 7 days (about 1/3). It was When the hearth is to be inspected without disassembling or transshipping the hearth, the worker can visually check the condition of the hearth only by removing the residual solution that has been oxidized and decolorized. You can In this case, since the residual solution can be easily removed and the hearth is not damaged, only the inspection of the hearth state can be surely performed without performing extra work such as repairing the hearth.

[0007]

EFFECT OF THE INVENTION Claim 1 of the present invention is a method for removing residual solution in a copper-making furnace, which removes the solution remaining at the bottom of the furnace when inspecting, dismantling, or transshipping the hearth bricks. Te, when extracting said solution from said furnace bottom blowing oxygen-enriched air by the lance from above the solution, because it is shall be tangled of at least part of the residual solution, remaining in the furnace bottom solution Oxygen is positively supplied to the solution to oxidize and caramize the solution, and by effectively stirring the solution, the temperature of each part of the solution is uniformly increased, and the fluidity of the solution is improved to improve the solution. Can be easily extracted from the bottom of the furnace. According to claim 2 of the present invention, the lance height is 0.5 from the solution surface.
By setting it to ~ 2 m, it is possible to prevent the lance from being blocked by the splash, and to prevent the hearth brick from being damaged when only the hearth inspection work is performed, while it is sufficient. The reaction can be carried out, the solidification of the solution can be surely prevented from cooling and solidification, and the oxidation and the caramelization of the solution can be smoothly realized. further,
According to claim 3 of the present invention, by setting the oxygen concentration of the oxygen-enriched air blown by the lance to 40 to 70%, sufficient reaction heat can be obtained to prevent solidification of the solution. Therefore, the lance can be prevented from being melted and the reaction can be smoothly and surely continued. . Furthermore, according to claim 4 of the present invention, the flow rate of the oxygen-enriched air blown by the lance is 130 to
By setting it to 150 Nm / s, the required reaction efficiency can be easily maintained, the solution can be sufficiently agitated, and the cooling jacket can be prevented from being melted by splashing, and the hearth can be prevented. When performing only the inspection, the melt in the bottom of the furnace can be smoothly removed without damaging the hearth. Further, claim 5 of the present invention
According to the above, when extracting the solution from the furnace bottom, by heating the inside of the furnace with a burner, the atmosphere in the furnace can be warmed to promote the oxidation reaction of the solution, and the reaction in the furnace can be stabilized. It is possible to continue and melt the splash adhered to the furnace wall and drop it into the solution at the bottom of the furnace, while increasing the temperature of the solution remaining at the bottom of the furnace to improve the fluidity of the solution. .
Still further, according to claim 6 of the present invention, after oxygen-enriched air is blown onto the solution, the solution is cooled and solidified, and the solidified solution is crushed and removed. Therefore, the solidified residual solution is The solidified solution is brittle and easy to be crushed because it is sufficiently oxidized and caramized. Therefore, the work of removing the solidified melt from the bottom of the furnace can be easily performed, and the damage to the hearth can be reliably prevented, and the hearth inspection, hearth dismantling, and transshipment work can be performed. It can be smoothly performed, and excellent effects such as a reduction in working time, a reduction in the number of workers, an improvement in the operating rate, and a reduction in the burden on workers can be achieved.

[Brief description of drawings]

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

[Explanation of symbols] C crude copper 3 Copper furnace 5b Lance 10 Bottom outlet

Claims (6)

(57) [Claims] 1. A method for removing a residual solution in a stationary copper furnace for removing a solution remaining at the bottom of a furnace floor when inspecting, dismantling, or transshipping the brick, wherein the solution is When extracting from the bottom of the furnace, blow oxygen-enriched air from above the solution with a lance to remove the residual solution.
Method for removing residual solution in converting furnace, characterized that you Karami of at least part of the. 2. The method for removing a residual solution in a copper-making furnace according to claim 1, wherein the lance height is set to 0.5 to 2 m from the solution surface. 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 residual solution in a copper-making furnace according to claim 1, 2 or 3, wherein the flow rate of the oxygen-enriched air blown by the lance is set to 130 to 150 Nm / s. 5. The method for removing a residual solution in a copper-making furnace according to claim 1, wherein the inside of the furnace is heated by a burner when the solution is extracted from the bottom of the furnace. 6. The method of claim 1, wherein the oxygen-enriched air is blown onto the solution, and then the solution is cooled and solidified, and the solidified solution is crushed and removed. A method for removing a residual solution in a copper manufacturing furnace according to the description.