JP4736226B2 - Non-ferrous metal smelting furnace - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a non-ferrous metal smelting furnace, and more particularly to the structure of a non-ferrous metal smelting furnace.
[0002]
[Prior art]
As a smelting process for non-ferrous metals, the Isasmelt method and the Ausmelt method have been put into practical use. In these smelting processes, raw materials ores and smelting reactions are used in slag, a mat (intermediate product in the form of sulfides generated in the smelting process up to metal) and at least one of metals. Cause smelting reaction with gas. And the exhaust gas containing the reaction product gas produced | generated by the said smelting reaction is discharged | emitted out of a furnace. At the same time, at least one of the mat and metal produced in the same manner is recovered and the slag is discharged. Each of these is appropriately processed in each processing step.
[0003]
FIG. 5 is a schematic perspective view of a non-ferrous metal smelting furnace used in the smelting process. In FIG. 5, the nonferrous metal smelting furnace has a vertical cylindrical furnace body, has a raw material inlet 11, a lance insertion port 12, and an exhaust port 13 in the furnace top portion 10, and further has a reaction bed portion 20. . Here, the raw material charging port 11 is for charging the raw material ore so that it can be dropped and supplied to the melt 21 made of at least one of mat and metal and slag. Further, from the lance insertion port 12, a lance 31 for injecting a smelting reaction gas from a tip 31a immersed in the melt 21 is inserted, and the exhaust gas is discharged from the exhaust port 13 to the outside of the furnace. Further, the reaction bed 20 stores the melt 21 and causes a smelting reaction between the raw material ore supplied to the melt 21 and the blown smelting reaction gas.
[0004]
[Problems to be solved by the invention]
In the nonferrous metal smelting furnace shown in FIG. 5, when the raw material ore used is fine, a part of the raw material ore is sucked into the exhaust port 13 together with the exhaust gas to become smoke ash. For this reason, there existed a problem that the smelting reaction efficiency fell and the trouble of the flue blockage occurred by adhesion of smoke ash. To solve this problem, conventionally granulating the raw ore with a pelletizer in advance before charging it to increase the particle size, or increasing the horizontal cross-sectional area in the furnace to slow down the exhaust gas flow rate. Although measures such as making it difficult for the raw material ore to scatter to the exhaust port 13 have been taken, it has not yet been fully solved.
[0005]
In addition, there is a problem that a part of the exhaust gas blows out from the raw material inlet 11 or the lance insertion port 12 or the raw material inlet 11 or the lance insertion port 12 may be blocked by the attachment of smoke ash. For this problem, countermeasures such as operating with a larger negative pressure near the furnace top 10 have been taken, but another problem is that the amount of exhaust gas increases and the load of exhaust gas treatment increases. Arise.
[0006]
The object of the present invention is to solve the above problems, that is, without granulating the raw ore, slowing the exhaust gas flow rate, or increasing the negative pressure near the top of the furnace, that is, normal operating conditions. (1) Raw material ore is unlikely to become smoke ash, so smelting reaction efficiency is excellent, (2) Exhaust gas is difficult to blow out from the raw material inlet and lance insertion port, and (3) Raw material inlet and lance insertion port are blocked with smoke ash It is to provide a non-ferrous metal smelting furnace that is difficult to be performed.
[0007]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventor has paid attention to the fact that the raw ore and exhaust gas are substantially countercurrently contacted in the furnace in the conventional non-ferrous metal smelting furnace, It came to be completed.
[0008]
That is, the nonferrous metal smelting furnace of the present invention is as follows according to the first and second inventions.
[0009]
A non-ferrous metal smelting furnace according to a first aspect of the present invention stores at least one of a mat and a metal, and a raw material charging port for charging raw material ore to drop and supply the molten metal comprising slag, and stores the molten material. And a reaction bed for causing a smelting reaction between the raw ore supplied to the melt and a smelting reaction gas blown into the melt, and a tip immersed in the melt. a lance insertion opening for inserting a lance for blowing the formulation smelting reaction gas, possess an exhaust port for discharging exhaust gas containing the reaction product gas produced by the formulation smelting reaction out of the furnace, and the furnace negative pressure In a conventional non-ferrous metal smelting furnace, the non-ferrous metal smelting furnace includes a ceiling part provided with the raw material inlet and the lance insertion port and a reaction bed, and the falling of the raw material ore from the raw material insertion port. and smelting reaction portion that exists route and the lance, the reflected Floor portion is formed to extend in the horizontal transverse direction, and, and a熔体static part comprising a roof portion of the exhaust port is provided apart from the smelting reaction unit, stable flow The exhaust gas thus formed flows through the melt stationary part to the exhaust port, and is a space different from the space where the raw ore falling path from the raw material charging inlet and the lance exist in the smelting reaction part. was a path without contacting with the ore and the furnace, characterized in that it is configured to be discharged out of the furnace. In addition, the above “differing” means that the path of the exhaust gas having a stable flow is different from the space where the raw ore falls and the lance exists.
[0010]
The non-ferrous metal smelting furnace of the second invention is a conventional vertical cylindrical shape in which a raw material charging inlet, a lance, a lance insertion opening, and an exhaust opening are provided in the ceiling , and the furnace has a negative pressure. In the non-ferrous metal smelting furnace, a space extending in the vertical direction from the ceiling part, the space where the raw ore falls from the raw material inlet and the lance exists, and the path through which the exhaust gas flows to the exhaust port A partition wall is provided , and the exhaust gas in a stable flow is configured to be discharged outside the furnace without contacting the raw material ore in the furnace . Also in this case, the path of the exhaust gas having a stable flow is different from the space where the above-described dropping path of the raw ore and the lance exist.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Ferrous metal smelting furnace of the first invention, exhaust gas containing the reaction product gas produced by the smelting reactions, flows through the space to space and the phase differences which exist dropping path and lance ore from the raw material charging hole as a path Thus, the exhaust port is provided in the ceiling part different from the ceiling part in which the raw material loading inlet and the lance insertion port are formed or in a part separated by the same ceiling part . In addition, the non-ferrous metal smelting furnace of the second aspect of the present invention has a path where the raw ore falls from the raw material inlet and a space where the lance exists and a path where the exhaust gas flows to the exhaust port so that the exhaust gas flows as described above. A partition wall is provided so as to extend vertically from the ceiling .
[0012]
Specific embodiments of the non-ferrous metal smelting furnace of the present invention (first and second inventions) include, for example, the following. These specific embodiments are appropriately selected depending on conditions such as the installation location of the nonferrous metal smelting furnace and the layout including other equipment.
[0013]
(1) FIG. 1 is a schematic perspective view showing a non-ferrous metal smelting furnace according to a first embodiment of the first invention. The nonferrous metal smelting furnace shown in FIG. 1 has a vertical cylindrical smelting reaction part 40 and a melt stationary part 50. Here, the smelting reaction part 40 has the raw material charging inlet 11 and the lance insertion port 12 in the ceiling part, and has the reaction bed part 20, and raises a smelting reaction between the raw material ore and the smelting reaction gas. Moreover, the melt stationary part 50 is formed by extending the reaction bed part 20 in the horizontal and horizontal directions, and has an exhaust port 51 for discharging exhaust gas to the outside of the furnace in the ceiling part. And the melt which complete | finished smelting reaction is left still by the melt stationary part 50 (the position of the melt surface was shown with the chain line). Therefore, the exhaust gas flows through the exhaust port 51 to the space S _l and the phase differences to space dropping path S _m and the lance 31 of ore from the raw material charging hole 11 is present as a path S _e.
[0014]
(2) FIG. 2 is a schematic perspective view showing the non-ferrous metal smelting furnace of the second embodiment of the first invention. The nonferrous metal smelting furnace shown in FIG. 2 has a smelting reaction part 60 and a melt stationary part 70. Here, the smelting reaction part 60 has the raw material charging inlet 11 and the lance insertion port 12 in the ceiling part, and has the reaction bed part 20, and is similar to the smelting reaction part 40 in FIG. A smelting reaction is caused to occur with the working gas. Moreover, the melt stationary part 70 is formed by extending the smelting reaction part 60 in the horizontal and lateral directions, and has an exhaust port 71 for discharging exhaust gas to the outside of the furnace in the ceiling part. Then, the melt that has finished the smelting reaction (the position of the melt surface is indicated by a chain line) is allowed to stand in the melt resting portion 70. Therefore, the exhaust gas flows through the exhaust port 71 to the space S _l and the phase differences to space dropping path S _m and the lance 31 of ore from the raw material charging hole 11 is present as a path S _e.
[0015]
(3) FIG. 3 is a schematic perspective view showing a non-ferrous metal smelting furnace of one embodiment of the second invention. The non-ferrous metal smelting furnace shown in FIG. 3 is the same non-ferrous metal smelting furnace as in FIG. 5, the path S _m of the raw ore from the raw material inlet 11 and the path S _{1 in} which the lance 31 exists and the path through which the exhaust gas flows. partition wall 81 separating the S _e is provided so as to extend from the ceiling portion in the vertical direction. Therefore, the exhaust gas flows through the exhaust port 13 to the path S _m and the space S _l and the phase differences to the space as a path S _e. The position of the melt surface is indicated by a chain line in FIG.
[0016]
The nonferrous metal smelting furnace of the present invention is used, for example, as follows. That is, first, the melt is stored in the reaction bed portion of the smelting reaction portion (necessarily also in the melt stationary portion if there is a melt stationary portion). Next, a lance for blowing the smelting reaction gas is inserted into the furnace through the lance insertion port, and the tip of the lance is immersed in the melt. Thereafter, the solid raw material ore necessary for the smelting reaction is usually charged into the furnace together with the solvent from the raw material inlet. At the same time, smelting reaction gas is blown from the tip of the lance. By doing so, a smelting reaction takes place in the reaction bed. And the exhaust gas containing the reaction product gas produced | generated by this smelting reaction is discharged | emitted from an exhaust port outside a furnace. At the same time, at least one of the mat and metal produced in the same manner is recovered and the slag is discharged.
[0017]
Since the non-ferrous metal smelting furnace of the present invention is as described above, the exhaust gas does not substantially counter-contact with the raw material ore in the furnace. Therefore, even under normal operating conditions, (1) the raw ore is less likely to become smoke ash and the smelting reaction efficiency is improved, (2) the exhaust gas is difficult to blow out from the raw material inlet and the lance insertion port, (3) the raw material inlet and lance The insertion slot is not easily blocked by smoke ash.
[0018]
【Example】
[Example 1]
FIG. 4 shows the dimensions of the same non-ferrous metal smelting furnace as in FIG. 1, but using this small non-ferrous metal smelting furnace, a test was conducted to smelt copper matte to metallic copper. .
[0019]
A 600 mm deep melt (copper mat. The position of the melt surface is indicated by a chain line) is stored in the reaction bed 20 and the melt stationary part 50 to start the test, and smelted for 4 days or more without interruption. did. And the reaction bed part 20 and the melt stationary part 50 produced | generated the melt which consists of metallic copper and slag. At this time, the copper mat as the raw material ore was continuously charged with a solvent having an average particle size of 20 mm together with the solvent. The test conditions such as the loading speed of the copper mat and the negative pressure near the ceiling of the smelting reaction part 40 were the same as in the past.
[0020]
During the test, no gas was blown out from the raw material charging port 11 and the lance insertion port 12 and no blockage of the raw material charging port 11 and the lance insertion port 12 with smoke ash was observed. Further, after the test, the inner diameter of the exhaust port 51 was hardly changed.
[0021]
【The invention's effect】
According to the present invention, under normal operating conditions, (1) the raw material ore is unlikely to become smoke ash, and thus the smelting reaction efficiency is excellent, (2) the exhaust gas is difficult to blow out from the raw material charging port or the lance insertion port, (3) the raw material It is possible to provide a non-ferrous metal smelting furnace in which the charging port and the lance insertion port are not easily blocked by smoke ash.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a first embodiment of a non-ferrous metal smelting furnace of the first invention.
FIG. 2 is a schematic perspective view of a second embodiment of the non-ferrous metal smelting furnace of the first invention.
FIG. 3 is a schematic perspective view of one embodiment of a non-ferrous metal smelting furnace of the second invention.
4 is a schematic perspective view of the non-ferrous metal smelting furnace used in Example 1. FIG.
FIG. 5 is a schematic perspective view of a conventional non-ferrous metal smelting furnace.
[Explanation of symbols]
10 furnace top 11 material charging hole 12 lance insertion opening 13,51,71 outlet 20 the bed portion 21熔体31 lance 31a lance tip 40,60 smelting reactions 50 and 70熔体static portion 81 partition wall S _m Fall path S _l of raw ore from the raw material inlet Space S _e in the vicinity of the lance Exhaust gas path

Claims (2)

At least one of a mat and a metal, and a raw material inlet for charging raw ore for dropping and supplying to the melt consisting of slag, and the raw material supplied to the melt while storing the melt Insert a reaction bed that causes a smelting reaction between the ore and the smelting reaction gas blown into the melt, and a lance that blows the smelting reaction gas from the tip immersed in the melt. A non-ferrous metal smelting furnace having a lance insertion port and an exhaust port for exhausting exhaust gas containing the reaction product gas generated by the smelting reaction to the outside of the furnace,
The non-ferrous metal smelting furnace includes a ceiling part and a reaction bed part provided with the raw material inlet and the lance insertion port, and a smelting process in which the raw ore dropping path from the raw material insertion port and the lance exist. A reaction section, and a melt stationary section provided with a ceiling section in which the reaction bed section is formed to extend in a horizontal and lateral direction and is spaced apart from the smelting reaction section and provided with the exhaust port. Have
The exhaust gas became steady stream, through該熔body static portion, flows into the exhaust port, a space in which the dropping path and the lance of the ore from the raw material charging hole in the smelting reaction unit is present A non-ferrous metal smelting furnace, characterized in that it is configured so that a different space is used as a path and is discharged outside the furnace without contacting the raw ore in the furnace. At least one of a mat and a metal, and a raw material inlet for charging raw ore for dropping and supplying to the melt consisting of slag, and the raw material supplied to the melt while storing the melt Insert a reaction bed that causes a smelting reaction between the ore and the smelting reaction gas blown into the melt, and a lance that blows the smelting reaction gas from the tip immersed in the melt. A vertical cylindrical nonferrous metal smelting furnace having a lance insertion port for discharging and an exhaust port for discharging exhaust gas containing the reaction product gas generated by the smelting reaction to the outside of the furnace. In
The non-ferrous metal smelting furnace includes the raw material charging inlet, the ceiling portion provided with the lance insertion port, and the exhaust port, and a reaction bed portion,
A partition that extends in the vertical direction from the ceiling and separates a path where the raw ore falls from the raw material inlet and a space where the lance exists and a path through which the exhaust gas flows to the exhaust port is provided , and is stable. The non-ferrous metal smelting furnace is configured such that the exhaust gas that has flowed is discharged outside the furnace without contacting the raw material ore in the furnace.

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