SU501076A1 - The method of smelting ferroalloys - Google Patents

Description

one

The invention relates to the field of ferrous and nonferrous metallurgy.

Ferroalloys in arc multielectrode furnaces are cast with uniform distribution of charge materials (by stoichiometric calculation) into the charging hoppers at each electrode, and the input of a reducing agent to the furnace is provided in the form of coke.

The purpose of the invention is to increase the electrical resistance of the furnace bath and reduce heat loss, increasing the yield of the fit.

The goal is achieved by introducing a carbon recovery agent into the bath through the charging point at the electrode with a positive potential, and the ore portion using a electrode with a negative potential. The amount of e. d. of the transition layers, the charge electrode will be directed against the external applied voltage, which will allow increasing the working voltage between the paired electrodes by at least 3-4%.

At the point of contact between the ore and the electrode during heating. d. due to the redistribution of electrons of more electronegative oxygen during the formation of carbon-oxygen complexes on the electrode surface. A negative potential appears on the electrode, and in the light, the ore layer is positive, which at temperatures of 1400-1500 ° C reaches 1-2 in depending

from the composition of the ore part of the charge. When loading the mixture of the same composition at each electrode, the formation of e. d. in the boundary layer at the electrode, they compensate each other, not allowing to significantly increase the voltage between the electrodes and reduce heat loss.

The described method of melting, for example, the SMi17 alloy is that the loading of portions of carbon recovery and the ore part is carried out depending on the potential at the electrode, synchronously the flow with polarity change with a frequency of 2-30 times per hour. Thus, for an electrode that has a positive potential at that moment, a carbonaceous reducing agent is fed to the charging hopper, and for an electrolyte with a negative potential, the ore part is fed. Due to this, the reduction of oxides and the smelting of the alloy are carried out at an elevated operating voltage between the paired electrodes with the maximum input power and elevated temperature in the working space of the furnace. In addition, it becomes possible to evenly discharge all electrodes. The batch charge is loaded into the bunkers, feeding the charging funnels through the pipe blowers, with a skip lift of the type of loading into the blast furnace. The melt is released as the metal accumulates and

batch furnaces in ladles for metal and slag. Polarity switching Dry, is triggered by a block of controlled terristors synchronously with the loading of the charge into the furnace.

Claims (1)

Formula invented and The method of smelting ferroalloys, I conclude, ICE: in the proportional loading of the charge and melting it by supplying different potentials to the electrodes, different in that. that, in order to increase the electrical resistance of the furnace bath and reduce heat losses, increase the yield, the portions of the carbon reductant and the ore part are loaded simultaneously, alternatingly and alternately polarized at a frequency of 2–30 times Currently, the potential is positive, a carbonaceous reductant is introduced into the feed funnel, and an electrode with a negative potential has an ore portion.