Large submerged arc furnace combined self-baking electrode device capable of removing housing and use method thereof

Abstract

The invention relates to a large submerged arc furnace combined self-baking electrode device capable of removing a housing and a use method thereof, belonging to the technical field of discharge heating self-baking electrodes. The large submerged arc furnace combined self-baking electrode device comprises an electrode, a combined holder and the like, wherein the combined holder comprises an electrode housing and the like, the electrode penetrates through a lower, a middle and an upper electrode stripping supporting platforms from top to bottom, hydraulic cylinders are arranged between the lower and the middle electrode stripping supporting platforms and between the middle and the upper electrode stripping supporting platforms, inner cavities of the upper and the middle electrode strippingsupporting platforms are provided with air bag band-type brakes, the electrode penetrates through the air bag band-type brakes, and the electrode housing is fixed with the holder. Through the matching of the air bag band-type brakes, and the hydraulic cylinders of the middle and the lower stripping supporting platforms, an electrode paste and electrode combined body is conveyed downwards into thebottom of a hearth for working and the electrode housing is immovable to ensure that the electrode housing is not consumed, thus the strength of the self-baking electrode is improved, the content of iron in the product is effectively reduced and the product quality is ensured.

Description

technical field [0001] The invention relates to the technical field of self-baking electrodes heated by electric discharge, in particular to a large-scale submerged arc furnace combined dehulling self-baking electrode device with a capacity of more than 25.5MVA and a use method thereof. Background technique [0002] At present, there are only two types of electrodes used in submerged arc furnace smelting: self-baked electrodes and prebaked electrodes (including carbon and graphite). Prebaked electrodes (including carbon and graphite electrodes) are made of raw materials such as low ash anthracite and metallurgical coke at a certain ratio and particle size at a certain temperature. It is converted by roasting or calcining at high temperature, and its cost is relatively high, about 15,000-30,000 yuan per ton. Its advantage is that it does not need to be roasted, and the iron impurities in the product are low. Restricted and other characteristics make production unsustainable ...

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Problems solved by technology

Prebaked electrodes (including carbon and graphite electrodes) are made of raw materials such as low ash anthracite and metallurgical coke at a certain ratio and particle size at a certain temperature. It is converted by roasting or calcining at high temperature, and its cost is relatively high, about 15,000-30,000 yuan per ton. Its advantage is that it does not need to be roasted, and the iron impurities in the product are low. Restricted and other characteristics make production unsustainable and increase costs

[0003] The self-baking electrode is made by putting the electrode paste into the electrode shell welded with ordinary steel plates on the upper part of the submerged arc furnace, and using the Joule heat of the current passing through the electrode itself and the radiant heat of the furnace to melt and roast the electrode paste. Under a certain paste column pressure, the conductive electrode carbon block has a certain strength and shape after slow roasting in the smelting process. Because it is used, formed and roasted at the same time, the forming and roasting processes are omitted, and the production process is simple. , the cost is relatively low, only 0.3-0.5 yuan per ton, but its disadvantage is that the electrode shell is also integrated into the submerged arc furnace during the production process, resulting in a high iron content in the product, which is not suitable for smelting to control the content of iron impurities. strict product

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