JP2689542B2 - Electric furnace for inorganic fiber production - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electric furnace used for producing an inorganic fiber. More specifically, the present invention relates to an electric furnace for producing inorganic fibers, in which a tap hole can be replaced without interrupting furnace operation.

[Prior Art] When a raw material containing blast furnace slag, natural stone, etc. is melted and an inorganic fiber is manufactured using a centrifugal fiberizer, etc., the amount of molten metal discharged, the temperature of molten metal discharged, and the position at which it flows down to the fiberizer are stabilized. It is essential. For this reason, the bottom hot water discharge method is excellent. However, it is difficult to separate impurities in the conventional electric furnace with one furnace and one chamber structure, and the tap hole must be replaced due to abrasion of the tap hole or closing of the tap due to devitrification of unmelted or molten material. Work is required.

In order to solve these problems, the electric furnace is made into two chambers, the raw material is melted in the main chamber, the impurities are retained at the bottom of the main chamber, the molten metal from which the impurities are separated is transferred to the sub chamber through the communication hole, Japanese Patent Laid-Open Nos. 63-176313 and 63-176314 disclose electric furnaces in which molten metal is discharged from a tap hole at the bottom of a chamber to a fiberizing device.

[Problems to be Solved by the Invention] However, even in the inventions disclosed in Japanese Patent Laid-Open Nos. 63-176313 and 63-176314, the sub-chamber is airtightly connected to the main chamber. In order to replace and repair the tap hole provided in the main room, the furnace operation in the main room had to be interrupted. Therefore, there was a problem that manufacturing efficiency was deteriorated by the replacement work. In particular, the outlet of the sub-chamber is apt to have troubles such as reduction in radial dimension due to solidification and deposition of the molten metal, so that the outlet needs to be replaced frequently.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and obtain an electric furnace for producing inorganic fibers with high productivity.

[Means for Solving Problems] An electric furnace for producing inorganic fibers according to the present invention comprises a primary furnace for melting raw materials including blast furnace slag and natural stone, and a molten metal obtained in the primary furnace for receiving the molten metal. A secondary furnace in which the temperature, viscosity, and supply amount to the fiberizing device are adjusted and which can be exchanged with the primary furnace, a position where the primary furnace and the secondary furnace are communicated with each other, and the molten metal in the primary furnace to the secondary furnace. It is characterized in that it has a communication passage device provided with a partition plate device that can be moved to any position where the movement can be interrupted.

[Operation] In the above electric furnace, the molten metal 12 heated and melted by the primary furnace 1 flows into the secondary furnace 3 from the communication passage device 5, the temperature is adjusted by the auxiliary electrode 6, and the amount of hot water discharged is adjusted by the hot water amount adjusting device 8. Then, it flows down from the bottom bottom tap 7. Furnace bottom tap 7
When it becomes necessary to replace the molten metal 12 from the primary furnace 1 with the partition plate device 4, the flow of the molten metal 12 from the primary furnace 1 is stopped, and the discharge of the molten metal is interrupted. It moves and exchanges with the secondary furnace 11 prepared beforehand, the partition plate device 4 is raised, the molten metal 12 is made to flow down from the furnace bottom tap hole 7, and tapping is restarted.

[Examples] Hereinafter, the electric furnace for producing inorganic fibers of the present invention will be described in detail with reference to Examples.

FIG. 1 is a schematic elevation view showing one embodiment of the electric furnace for producing inorganic fibers of the present invention, and FIG.
It is A 'line sectional drawing. 1 and 2, 1 is a primary furnace, 2 is a main electrode, 3 is a secondary furnace, 5 is a communicating passage device, and 4 is a partition plate device provided in the communicating passage device.

The primary furnace 1 is almost the same as a conventional one-chamber electric furnace of the related art, but has an iron vent hole 13 at the bottom so that impurities such as iron can be extracted. Further, at a height such that impurities remaining at the bottom of the primary furnace do not enter the secondary furnace, the communication passage 5 is formed on the side wall.
It has an entrance part to.

The communication passage device 5 is a passage for guiding the molten metal separated from impurities in the primary furnace to the secondary furnace 3, and has a slit in the middle of the passage.
By moving up and down the water-cooled partition plate device 4 in the slit, the inflow of the molten metal from the primary furnace to the secondary furnace is started or interrupted. The partition plate device 4 uses a carbon steel plate,
This is a structure in which the inside is hollow and water is cooled. The primary furnace and the communication passage device are made integrally.

In the secondary furnace 3, the molten metal flowing in through the communication passage is fed to the auxiliary electrode 6
To heat and adjust the temperature and viscosity. The auxiliary electrode 6 is provided independently of the secondary furnace, can be moved up and down by a known means such as an electric winch, and is lifted up when replacing or repairing the secondary furnace. The tap hole 7 is for stably supplying a predetermined amount of molten metal to the fiberizing device at a constant speed, and is provided at the bottom of the secondary furnace. A molten metal amount adjusting rod having a wedge-shaped tip is inserted into the outlet from the inside of the furnace, and the amount of molten metal is adjusted by the distance between the outlet and the rod wedge-shaped tip by vertically moving the rod. It goes without saying that the adjustment of the molten metal amount is not limited to this method. The secondary furnace and the communicating furnace are connected to each other so that they can be easily removed from each other at the time of replacement / repair by providing a flange 14 at the connecting portion between them and providing a locking device on this flange to ensure a liquid-tight connection. It was done. In addition to this, a method of providing a fitting portion so as to be fitted in a cassette type may be used. In order to remove the secondary furnace from the communication passage and install a new secondary furnace, lay a rail 10 at the secondary furnace position in advance, arrange a movable carriage on this rail, fix the secondary furnace on this carriage and transfer it. did. Alternatively, a method of transferring and attaching with a lift may be used.

[Effect] In the electric furnace of the present invention, the operation of the primary furnace is stopped even when the tap hole provided in the secondary furnace is replaced or repaired by providing the secondary furnace that can be replaced during the operation of the primary furnace. It was unnecessary to do. For this reason, the melting work efficiency of the raw material for producing the inorganic fiber was improved, and as a result, the production efficiency of the inorganic fiber production was significantly increased.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example in which the present invention is applied to an electric furnace for producing rock wool, and FIG. 2 is a plan view taken along the line AA 'in FIG. 1 ... Primary furnace, 2 ... Main electrode, 3 ... Secondary furnace, 4 ... Water-cooled partition plate device, 5 ... Communication device, 6 ... Auxiliary electrode, 7 ... Furnace bottom tap port, 8 ... … Hot water amount adjusting device, 9 …… Secondary furnace moving drive vehicle, 10 …… Secondary furnace moving rail, 11 …… Secondary furnace that has been prepared in advance, 12 …… Melting metal, 13 …… Iron vent hole.

Claims (1)

(57) [Claims] 1. An electric furnace for producing inorganic fibers, comprising: a primary furnace for melting raw materials containing blast furnace slag, natural stone, etc., and a molten metal obtained in the primary furnace, and the temperature, viscosity and fiberizing device of the molten metal. Of the secondary furnace, which is capable of adjusting the supply amount of the secondary furnace and which can be exchanged with the primary furnace, the position where the primary furnace and the secondary furnace are communicated with each other, and the position where the movement of the molten metal in the primary furnace to the secondary furnace can be interrupted. And a communication passage device having a partition plate device movable to any one of the positions.