A method for preventing hard breaking of electrodes in the production of manganese-silicon alloys in submerged arc furnaces

Abstract

This application proposes a method for preventing the hard breaking of electrodes in the production of manganese-silicon alloys in submerged arc furnaces, including lowering the electrodes by 200-300 mm after the peak-avoiding power outage, and lifting the electrodes by 100-150 mm before power transmission again , When sending power, control the initial current to be less than 200A, and then increase the current at a speed of 5‑7A / min until it reaches full load. In this application, by controlling the position of the electrode in the electrode holder after the peak avoidance, and by controlling the lifting speed of the energized current, the problem of hard breaking of the electrode when the power is turned on again after the peak avoidance is effectively prevented, and the electrode can be prevented frequently during heat shutdown, And it works normally when the furnace is shut down for a long time, reducing the impact of electrode hard break on the furnace condition, enabling the submerged arc furnace to produce long-term and stable off-peak production, reducing the cost of smelting electricity, thereby improving the market competitiveness of the enterprise.

Description

technical field [0001] The application belongs to the technical field of ore smelting, and in particular relates to a method for preventing hard breaking of electrodes in submerged arc furnace off-peak production. Background technique [0002] In order to alleviate the electricity consumption pressure during the peak period of electricity consumption and ensure the safe use of the power grid, our province implements three phases of peak, flat, and valley electricity prices. Valley electricity. The production of manganese-silicon alloys in submerged arc furnaces (using off-peak electricity and part of normal electricity production) produces manganese-silicon alloys. The hot shutdown is frequent and the shutdown time is relatively long. Cracks lead to frequent hard breaks of the electrodes, resulting in fluctuations in furnace conditions. In severe cases, it will be difficult to insert the three-phase electrodes, the smelting crucible area will be lifted, large heat loss, con...

AI Technical Summary

Problems solved by technology

However, in actual production, when realizing off-peak production of the submerged arc furnace, it is necessary to repeat the operation of power-on and power-off cycles every day, the electrode is more prone to hard breakage, and the protection requirements for the electrode are higher, so the electrode protection method of this patent is more applicable. It is not suitable for the protection of electrodes in the off-peak production of submerged arc furnaces when the furnace is occasionally shut down for a long time.

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