RU184482U1 - ORE-THERMAL ELECTRIC FURNACE - Google Patents

Abstract

The utility model relates to electrometallurgy and can be used in the construction of ore-thermal electric furnaces for conducting smelting reduction of metals and alloys from non-ferrous and ferrous metallurgy ores. An ore-thermal electric furnace contains a bath with a rotation mechanism around the vertical axis, a supporting cylinder with mechanisms for lifting, holding and bypassing the electrode located inside the cylinder, where at least two devices for disconnecting the electric drive of the furnace bath rotation mechanism, consisting of a body, are attached to the lower part of the supporting cylinder, a rod transmitting force when the electrode is shifted to the lever of the switch for driving the mechanism of rotation of the bathtub, stop and return spring. The utility model is based on a task aimed at improving the reliability of equipment operation, in terms of trouble-free operation of electrodes, while the technical result is a reduction in electrode consumption. 2 s.p. f-ly, 1 ill.

Description

Technical field

The utility model relates to electrometallurgy and can be used in the construction of ore-thermal electric furnaces for conducting smelting reduction of metals and alloys from non-ferrous and ferrous metallurgy ores.

State of the art

When conducting reducing smelting, the furnace bath rotates around a vertical axis to expand the reaction zones and increase the active cross section of the furnace top. In case of deviations from the normal course of the furnace (segregation of charge materials, the appearance of local emissions of reaction gases), during the smelting of complex alloys, where the independent charge flow is limited, dense sintered sections of the charge appear, which, when the furnace bath rotates, displace the electrode relative to the vertical axis. Since the mechanism of holding (bypassing) the electrode is rigidly connected with the carrier cylinder, the electrode, moving inside the carrier cylinder under the influence of horizontal forces, loses its mechanical strength and breaks off.

A known node for fixing a graphite electrode of an ore-thermal electric furnace (SU No. 1177635, F27D 11/10, publ. 07.09.85), consisting of water-cooled spring-loaded clamps placed on a bearing cylinder radially relative to the electrode. According to the authors, fixing the electrode reduces bending moments in the electrode, which protects the electrode from damage. The disadvantage of this technical solution is the design complexity and lack of reliability during operation of the furnace.

Known ore-thermal electric furnace containing a bath with refractory masonry, the mechanism of rotation of the bath around a vertical axis, a bearing cylinder with mechanisms for lifting, holding and bypassing the electrode located inside the bearing cylinder. The vertical axis of the electrode and the bearing cylinder coincide, the electrode can be carbon or self-firing, consisting of a steel casing filled with electrode mass (Shevchenko VF Device operation of equipment of ferroalloy plants. Reference book, M, metallurgy, 1982, 208 S.).

The disadvantage of this furnace is the lack of conditions to prevent breakage of the electrodes.

By technical nature, by the presence of common features, this technical solution was adopted as the closest analogue.

Utility Model Disclosure

The utility model is based on a task aimed at improving the reliability of equipment operation, in terms of trouble-free operation of electrodes.

The technical result of the proposed solution is to reduce the consumption of electrodes.

The technical result is achieved due to the fact that in the ore-thermal electric furnace containing a bath with a rotation mechanism around the vertical axis, the supporting cylinder with the mechanisms for lifting, holding and bypassing the electrode located inside the cylinder, it is new that at least the bottom of the supporting cylinder are attached two devices for disconnecting the electric drive of the furnace bath rotation mechanism, consisting of a body, a rod transmitting force when the electrode is shifted to the lever of the switch switch of the bath rotation mechanism drive emphasis and return spring.

The claimed solution is complemented by private distinctive features that contribute to the achievement of a technical result.

So, the rod is made of non-conductive, non-magnetic material; the vertical axis of the electrode and the bearing cylinder coincide.

Brief Description of the Drawings

In FIG. 1 shows devices for disconnecting an electric drive of a rotary mechanism of a furnace bath.

Utility Model Implementation

The ore-thermal electric furnace contains a bath with refractory masonry, a bath rotation mechanism around a vertical axis, and at least two devices to turn off the electric drive of the furnace bath rotation mechanism, which consist of a housing 1, a rod 2 transmitting force when the electrode is shifted to the lever 3 of the switch 4 of the rotation mechanism drive 4 bathtub, stop 5 for supporting the return spring 6 of the rod 2. The devices are attached to the bottom of the supporting cylinder 7. Since the electrode 8 is under electric voltage, the rod 2 touching The electrode must be made of non-conductive, non-magnetic material, for example, fluoride plastic.

The vertical axis of the electrode and the bearing cylinder coincide, the electrode can be carbon or self-firing, consisting of a steel casing filled with electrode mass.

The device operates as follows.

To increase the reliability of the ore-thermal electric furnace in the lower part of the bearing cylinder, devices are installed that, when the electrode 8 is displaced inside the bearing cylinder 7, a horizontal force is transmitted to the rod 2, which moves, presses on the lever 3 of the switch 4 of the actuator of the bath rotation mechanism and the drive of the rotation mechanism is turned off bathtubs. Further operation of the furnace without rotation of the bath allows the electrode to return to a vertical position, which eliminates its breakage. When aligning the electrode 8 in a vertical position, the return spring 6 returns the rod 2 to its original position, the lever 3 of the switch 4 is released and the drive of the bath rotation mechanism is turned on.

Comparing existing designs of furnaces with the proposed technical solution, it should be noted that they have as common features:

- a bearing cylinder with mechanisms for lifting, holding and bypassing an electrode located inside the bearing cylinder;

- a furnace bath with a rotation mechanism around a vertical axis; and the difference from the existing design solutions:

- a device that disables the electric drive of the rotational mechanism of the furnace bath when the electrode deviates from the vertical axis and the electrode is displaced inside the carrier cylinder.

These differences allow us to conclude that the proposed technical solution meets the criterion of "novelty." Signs that distinguish the claimed method from the prototype, not identified in other technical solutions and, therefore, provide the claimed solution meets the criterion of "inventive step".

An ore-thermal furnace equipped with carbon electrodes, with a device for disconnecting the electric drive of the furnace bath rotation mechanism, has been tested in the production of technical silicon.

Over the previous 6 months of the furnace’s operation, two breakdowns of the electrodes occurred, the electrode consumption was 112 kg per ton of silicon. During the test period of the device for 8 months, no electrode breakdowns occurred on the same furnace; the electrode consumption during the test period was 98 kg per ton of silicon.

Claims (3)

1. Ore-thermal electric furnace containing a bath with a rotation mechanism around a vertical axis, a supporting cylinder with mechanisms for lifting, holding and bypassing the electrode located inside the cylinder, characterized in that two devices for disconnecting the electric drive of the furnace bath rotation mechanism are fixed to the lower part of the supporting cylinder, consisting of a body, a rod located inside it, transmitting force when the electrode is shifted to the lever of the switch for driving the bath rotation mechanism, a return spring and an abutment it. 2. The furnace according to claim 1, characterized in that the rod is made of non-conductive, non-magnetic material. 3. The furnace according to claim 1, characterized in that the vertical axis of the electrode and the bearing cylinder coincide.

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