Self-baking electrode smelting method and device suitable for corundum smelting

Abstract

The invention discloses a self-baking electrode smelting method suitable for corundum smelting. According to the method, a self-baking electrode smelting process is adopted, namely, electrode paste isdirectly used in a three-phase electric arc furnace as a conductor, after a power supply is conducted, the electrode paste is gradually fused and resistance heat of the electrode paste generates roasting heat of an electrode; a part of the roasting heat is used for smelting a raw material for producing corundum, so that the raw materials is smelted; the residual heat can be used for strengtheningthe roasting of the head part of the electrode; under the action of high temperature and large current, the electrode paste, in the fusion state, at the head part of the electrode is coked and graphitized, and finally the electrode paste is converted into a conductive electrode and the corundum raw material under the fusion state also has conductive performance; and under the action of the conductive electrode, the corundum raw material under the fusion state can complete high-temperature and high-heat roasting. According to the method, the self-baking electrode process is creatively appliedto the corundum production process, so that the key problems in high temperature and product quality as present corundum industry adopts self-baking electrodes are solved.

Description

technical field [0001] The invention relates to the technical field of corundum smelting, in particular to a self-baking electrode smelting method suitable for corundum smelting. Background technique [0002] 1. Corundum smelting technology [0003] The corundum smelting process is mainly divided into four stages: furnace opening, smelting, control, and refining. Smelting accounts for more than 80% of the total smelting time. At this stage, the charge is melted into a liquid state, impurities are reduced, and ferrosilicon alloy is formed and separated from the corundum melt. Refining is the last stage, the purpose is to fully reduce the impurities, the ferrosilicon alloy is better precipitated and gathered, and the gas in the furnace is discharged smoothly. [0004] Corundum smelting belongs to submerged thermal electric furnace smelting method, and there are three main smelting methods: fixed furnace melting block method, dumping furnace smelting method and flow method sm...

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Problems solved by technology

[0019] 2.4. Problems of graphite electrodes in corundum smelting

[0020] 1. The cost is relatively high

Due to the pollution of graphite electrodes, the production of graphite electrodes in Hebei, Shandong, Henan and other provinces has been limited and stopped due to the influence of national environmental supervision. The output of graphite electrodes has decreased. At the same time, with the supply With the deepening of side reforms, the steel industry continues to warm up, coupled with the thorough cleaning and rectification of "floor steel" and intermediate frequency furnaces in various places, resulting in a sharp increase in the demand for electric furnaces by steel companies, which drives the demand for graphite electrodes. Therefore, there is a shortage of supply The balanced situation makes the price of graphite electrodes continue to rise from April to August 2017

Graphite electrode is an indispensable element in corundum smelting, and its price rise greatly increases the cost of corundum smelting

[0021] 2. High resource consumption

Graphite electrodes need to go through manufacturing processes such as green molding, roasting, impregnation, graphitization, and post-processing, which consume a lot of energy and cause a waste of resources and energy to a certain extent.

[0022] 3. Environmental pollution

[0028] At present, no domestic enterprise can successfully apply self-baking electrodes to the corundum industry. There are many technical problems in the application of self-baking electrodes in the corundum industry, such as the high temperature of corundum smelting, the connection of short networks, and the impact of self-baking electrodes on product quality. These technical problems have not been solved at present, which is why corundum companies cannot successfully use self-baking electrodes.

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