Electric arc furnace steelmaking method for making foaming slag by adopting calcium carbonate instead of calcium oxide

Abstract

The invention relates to the field of smelting, in particular to an electric arc furnace steelmaking method using calcium carbonate instead of calcium oxide to form foam slag, comprising the following steps: 1) charging step; 2) melting step; 3) heating step; 4) oxidation step , when making steel in electric arc furnace, by adding calcium carbonate pyrolysis to produce CO2 and highly active CaO, CO2 is non-polluting, CO2 bubbles float up to form foam slag, and the foam slag can be completely buried in the arc, effectively avoiding the exposure of the arc to high-temperature corrosion of the furnace wall At the same time avoid the energy loss caused by the exposure of the arc and effectively reduce the noise generated by the electrode during the arc generation process. The foam slag layer can react with the C in the smoke to generate CO, thereby reducing the pollution of the operating environment by the C-containing smoke generated during the smelting process. High activity CaO and P2O5 in molten steel produce oxidation reaction to generate CaO. P2O5 is stably stored in steel slag and removed, so as to achieve the effect of P removal.

Description

technical field [0001] The invention relates to the field of smelting, in particular to an electric arc furnace steelmaking method in which calcium carbonate is used instead of calcium oxide to form foam slag. Background technique [0002] Electric arc furnace steelmaking is to use the high temperature generated by the arc to smelt metals. However, the energy in the arc formed by the gas discharge is very concentrated, and the temperature in the arc area reaches above 3000°C. The arc effect is poor, the exposed arc produces a lot of noise, and the carbon-containing smoke and dust generated during the metal smelting process pollutes the environment. The exposed arc is easy to corrode the furnace wall at high temperature and shorten the service life of the furnace wall. When adding metallurgical CaO to remove phosphorus in the steelmaking process, the activity of traditional CaO is low and the production of traditional CaO emits a large amount of CO 2 , CO and dust, high ener...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies existing in the prior art, to provide a kind of electric arc furnace steelmaking method that adopts calcium carbonate to replace traditional calcium oxide to make foaming slag, in a kind of adopting calcium carbonate to replace traditional calcium oxide in the present invention In the electric arc furnace steelmaking method for foaming slag, in the electric arc furnace smelting process, calcium carbonate is added to submerge the arc to solve the problem that the existing foam slag is difficult to generate, and the poor submerged arc effect causes the electric arc furnace to produce carbon-containing smoke and dust and noise Large, exposed arcs are likely to cause high-temperature corrosion of the furnace wall and shorten the service life of the furnace wall. At the same time, the exposure of the arc light causes energy loss. The use of traditional calcium oxide has low activity and the production of traditional CaO emissions seriously pollutes the environment and high energy consumption. Traditional CaO in steel The slow dissolution rate in the molten steel and the low effective reaction rate of phosphide in the molten steel lead to the problem of large consumption of CaO when removing P

Images