JPS635668B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a method for supplying a mixture of ore and coke to an electric furnace used for distillation and smelting of ores such as zinc.
This relates to a feeding device for an electric furnace for charging.

(Prior Art) First, an outline of a conventional ore feeding device for an electric heating furnace used for reduction during zinc smelting will be explained with reference to FIGS. 3 to 5.

The upper end surface of the furnace 1, which is a vertical cylindrical body, is closed with a rotary furnace lid 2, and a toothless plate 2a formed on the upper surface of this furnace lid 2 is connected to a drive mechanism installed outside the furnace. It is continuously driven by 3, that is,
It is driven by an output pinion 5a of a transmission 5 directly connected to a drive motor 4 and rotates continuously.

Therefore, an ore feed hole 2b is drilled at one location on the circumference of the furnace lid 2, penetrating vertically, and this ore feed hole 2b follows the furnace lid 2 and rotates as one body. It is connected to the lower end opening of the chute 6.

By the way, a mixture of sintered zinc ore and sized coke (weight ratio: 2 ore: 1 coke) is continuously flowing down into this chute 6 from a hopper (not shown) connected above. As a result, the above-mentioned mixture (hereinafter referred to as the charge) continuously falls into the furnace 1 from the ore feed hole 2b.

The charge that has flowed into the furnace 1 once forms an ore feed layer F in the upper part of the furnace and then moves downward one by one, but the surface of the ore feed layer F is Since the hole 2b rotates continuously,
The mountain is high on the circumferential line directly below the ore feed hole 2b, and has a concave shape near the core C.

Incidentally, the charge that has been moved downward in the furnace generates zinc vapor from the ore by combustion heating of the coke component by the electric heat applied to the electrode 7, and the zinc component separated from the discharged ore is transferred to the capacitor 8. During this distillation operation, the temperature inside the reactor near core C is 1.200.
℃, and the surrounding area near the furnace wall reaches 900℃.
The temperature has reached the nearby temperature.

In addition, as mentioned above, the purpose of forming the surface shape of the feed layer F of the charge into a mountain-shaped distribution on the periphery by continuously rotating the furnace cover 2 in the charge of the mixture is to make it easier to roll. This is to distribute the characteristic coke components as close to the furnace wall as possible, and to collect the ore components that are difficult to roll near the core C, thereby increasing the heating efficiency for the charge and the distillation efficiency for the ore. .

In the conventional structure described above, the ore feed hole 2b is bored in one place in the furnace lid 2, but in the actual conventional structure, the furnace lid Three ore feed holes with different center distances are drilled at three locations on the radius line of the lid 2, and the lower end of the chute 6 is connected to one of the selected ore feed holes when operating the electric heating furnace. This makes it possible to selectively change the component distribution state of the ore feed layer F.

(Problems to be Solved by the Invention) By the way, in the conventional ore feeding device having the above-described configuration, it is necessary to attach a drive mechanism 3 for rotationally driving the furnace lid 2, and the weight of the furnace lid 2 is large. Because it is large (several tons), it requires a large power capacity of about 5.5kw, which creates a large burden in terms of equipment costs and operating costs for the electric heating furnace. However, there is a problem in that it takes a lot of effort to remove the drive pinion 5a from the furnace lid 2.

In addition, electrical insulation is required for the sand seal portion S where the lower surface of the outer peripheral edge of the tooth plate 2a of the furnace cover 2 slides into contact with the upper edge of the furnace 1. There was a problem that such troubles were likely to occur.

The present invention has been made to solve these problems. Specifically, the present invention aims to improve the surface distribution of the ore feed layer in the upper part of the furnace while the furnace cover remains fixed to the upper end of the furnace. It is an object of the present invention to provide an ore feeding device for an electric heating furnace in which a component distribution shape similar to that of the conventional structure described above can be obtained.

(Means for solving the problem) In order to achieve the object, in the configuration of the present invention, the upper end surface of the furnace consisting of a vertical cylindrical body has a furnace lid with an ore feed hole opened at the center position. is covered and fixed, and a disk-shaped support plate centered on the reactor core is suspended almost horizontally at a position in the reactor that is lowered from the lower surface of the reactor lid by an appropriate contact distance. It has a structure.

(Function) With this structure, the charge that falls into the furnace from the ore feed hole in the center of the furnace lid hits the center of the receiving plate and is temporarily deposited on the receiving plate, and the shape of the deposited layer is After growing into a conical shape with the periphery of the receiving plate as its hem, the charged portion overflows from the entire periphery of the receiving plate and falls into the furnace, and as a result, the distribution shape of the surface of the feed layer in the upper part of the furnace changes. ,
As in the case of a conventional ore feeder rotating fall, an effective shape is formed in which a high peak is formed on the peripheral edge of the furnace near the furnace wall.

(Example) Hereinafter, the configuration of the present invention will be specifically described based on two illustrated examples.

(a) First embodiment (see Figure 1) In the ore feeding device of this embodiment, a furnace lid 8 made of a simple heat-resistant plate is removably covered and fixed to the upper end of the furnace 1. An ore feed hole 8a is drilled in the center of the furnace lid 8, and the ore feed hole 8a is connected to the lower end opening of a downwardly movable chute 9.

In addition, at multiple locations on the circumference of the furnace lid 8 (in the illustration, two locations on the left and right), there are hanging rods 10, which will be described later.
A through hole 8b is opened through which the through hole 8b passes.

Next, at a high place 11 directly above the furnace 1, there is a bracket formed in a U-shape by left and right suspension frames 12 and a guide frame 13 horizontally installed between the lower ends of both suspension frames 12. 14 is fixedly installed, and a dynamic pressure cylinder 15 for lifting and lowering is installed facing downward at an intermediate position between the bases of both suspension frames 12, and at the lower end of an operating rod 15a of the cylinder 15, A central portion of a horizontal hanging bar 16 is attached.

Therefore, at both left and right ends of the hanging bar 16,
The upper ends of hanging rods 10 made of a heat-resistant and insulating material such as ceramic are attached, and the middle of each hanging rod 10 is guided through a guide hole in the frame 13, and then inserted through the furnace lid 8. A retainer 10a is formed at the lower end of the retainer 10a, which passes through the hole 8b in a sealed manner and can hold the end of the plate.

Further, at a position below the lower surface of the inner furnace lid 8 of the furnace 1 by a contact distance d of an appropriate size, a disk-shaped heat-resistant receiving plate 17 with the core C in the center is suspended horizontally. Both end portions of the receiving plate 17 on the left and right diameter lines are fixed and held by the retainers 10a at the lower ends of both the hanging rods 10, respectively.

Here, the operation of the ore feeding device of the embodiment configured as described above will be explained.

The charge that has fallen into the furnace 1 from the ore feed hole 8a via the chute 9, that is, the mixture of ore components and coke components, hits the center of the receiving plate 17 and is deposited on the receiving plate 17, and the deposited layer is After the shape of E grows into a conical shape with the periphery of the receiving plate 17 as its base as shown in the figure, the charge overflows from the entire periphery of the receiving plate 17 toward the furnace wall in the furnace, resulting in As in the case of the conventional rotating drop, the bottom of the feed layer is distributed concentrically into a part A that forms a high mountain on the circumference near the furnace wall and a part B that forms a mortar shape in the center.

However, according to this distribution, as mentioned in the section on the conventional structure, the mountain portion A of the ore feeding layer F is
The mortar part B, which becomes a coke rich layer and is near the core C, becomes a sinter (ore) rich layer, and an effective distillation separation action of the zinc component is performed.

If the contact distance d between the receiving plates 17 is narrowed by adjusting the elevation of the cylinder 15, the coke richness density will be biased towards the periphery, and if the contact distance d is widened, the coke rich density will be shifted closer to the core C. Since it spreads, the temperature distribution in the furnace 1 can be adjusted and maintained in the best condition according to the environmental conditions of the furnace 1.

(b) Second embodiment (see Figure 2) The configuration of the ore feeding device of this embodiment is completely different from that of the first embodiment except for the diameter of the receiving plate 18 and the manner in which the receiving plate 18 is held. The configuration is the same as in the example, that is, the furnace lid 8 is fixed to the upper end surface of the furnace 1, a bracket 14 and a cylinder 15 are installed at the high place 11, and the operating rod 15a has a hanging A bar 16 is attached.

Incidentally, a horizontal mounting arm 19a is fixed in an L shape at the lower end of each of the left and right hanging rods 19, and a receiving plate 1 is attached to the inner end of the arm 19a.
A bolt hole for attaching the arm 19 is made, and the small diameter receiving plate 18 is detachably fixed to the arm 19a by a bolt 20.

In the case of this embodiment, in addition to the small diameter receiving plate 18, medium diameter and large diameter receiving plates (equal to the diameter of the receiving plate 17) with different diameters are prepared separately. It is designed so that it can be installed in the same bolt hole as mentioned above, and in the notation, the receiving plate 1
8 was selected and used.

In the operation of the ore feeding device of this embodiment, since the diameter of the receiving plate 18 is small, the hem diameter of the deposited layer E is small, and as a result, the concentric diameter of the peak of the ore feeding layer F becomes small. is closer to the reactor core C, resulting in a distribution with a higher coke ratio near the reactor wall.

It goes without saying that if the receiving plate 18 is replaced with another receiving plate having a larger diameter, the distribution of the ore feeding layer will be similar to that in the first embodiment described above.

As described above, in the embodiment of the present invention, a distribution of the charge similar to the conventional one is obtained for the ore feeding operation, and thereby a good distillation action of the ore is obtained.

Therefore, in the configuration of the embodiment, since the furnace cover 8 is fixedly attached, there are the following advantages over the conventional structure.

(a) There is no need for a power drive mechanism, so equipment costs and operating costs are reduced, and the furnace cover can be made lighter.

(b) There is no need to take insulation measures for the sand seal part, and troubles are eliminated.

(c) The work of attaching and detaching the furnace lid does not require much effort and expense, and maintenance of the electric heating furnace is greatly simplified.

In the configuration of the above-described embodiment, the receiving plates 17 and 18 are raised and lowered by a single cylinder, but instead of this, a cylinder is provided for each of the hanging rods 10 and 19 individually. , catch plate 1
7 and 18 may be made to have a gradient, and by doing so, the distribution of the components of the ore-feeding layer can be diversified.

Furthermore, in the configuration of the second embodiment, in order to make the diameter of the receiving plate variable, a method was adopted in which a plurality of receiving plates of different diameters were selectively used. It is also possible to use a receiving plate with an assembly structure that allows diameter expansion and diameter reduction.

(Effects of the Invention) As described above, according to the ore feeding device for an electric heating furnace according to the present invention, the furnace lid is fixed to the upper end surface of the furnace, and the ore feeding hole is drilled in the center of the furnace lid. The structure is such that the receiving plate is suspended almost horizontally in the furnace at an appropriate height below the furnace, so while maintaining good ore feeding operability, there is no need for the conventional method of rotating the furnace lid. This has the effect of improving the economic efficiency, reliability, and maintainability of electric heating furnaces.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an ore feeding device for an electric heating furnace showing a first embodiment of the present invention, FIG. 2 is a schematic diagram of an ore feeding device showing a second embodiment, and FIG. 3 is a conventional ore feeding device. Figure 4 is an enlarged view of the upper part of Figure 3.
FIG. 5 is a top view of FIG. 4. C...core, d...contact spacing, 1...furnace, 8...
...Furnace cover, 8a...Ore feed hole, 10, 19...Hanging rod, 15...Cylinder as variable drive means, 1
7, 18...Each receiving plate having a different diameter.

Claims (1)

[Claims] 1. A furnace lid with an ore feed hole opened at the center is covered and fixed to the upper end surface of the furnace consisting of a vertical cylindrical body, and an appropriate dimension is removed from the bottom surface of the furnace lid. An ore feeding device for an electric furnace, characterized in that a disk-shaped receiving plate centered on the reactor core is suspended almost horizontally at a position in the furnace that is lowered by a contact interval of . 2. The ore feeding device for an electric heating furnace according to claim 1, wherein the receiving plate is suspended so that the contact interval is variable. 3. The ore feeding device for an electric heating furnace according to claim 1, wherein the receiving plate is formed so that its diameter can be changed. 4. The electric heating furnace according to claim 1, wherein the receiving plate is hung at several locations in the circumferential direction and the distribution of the charge into the furnace is controlled by changing the angle between the receiving plate and the horizontal plane. Ore feeding equipment.