SU274915A1 - Method of converting metallurgical melts - Google Patents

Description

There is a known method of converting metallurgical melts by oxidative blowing of the melt by blowing, supplied at an angle of 70-8 ° to the surface of the bath, which has zones of blowing, slagging and slag settling.

The peculiarity of the proposed method lies in the fact that the conversion is carried out in a variable depth bath with a ratio of gaps of blowing zones and slag encapsulation equal to O, 3-O, 8, when being fed, blowing to a depth of 0.4-0.7 of the bath in the blowing zone and pouring the initial melt into the washing zone located between the slag-forming zone of the bath and the slag settling zone. The method ensures the continuity of the process, the expansion of the composition of the convertible melts and the depletion of converter slags

The shpak is released from the subpaco ppus, the molten bath held in the settling zone, which provides for the weakening of the converter shpak.

The melt is converted into verticals with a circulating depth closed by blowing a variable depth with a depth ratio of 0.3–0.8, with n and a deeper section of the stream serving the path, loading flux n other cold materials beyond the limits of the blowing funnel and selecting from the bottom product, and in a smaller section of the stream, closed at the end of its floating layer of flux - flux & oi fur coat, feed the initial melt, discharge the slag from under this layer.

The method provides three options for its implementation.

In the first embodiment, the flow of the circulating melt at the junction of depths is tightened, for example, by means of an overflow threshold.

According to the second variant, the necessary part of the total required amount of oxidizing blowing or additional blowing of a different nature, or both of them are fed to the slag washing zone.

According to the third variant, the washing zone of the slag is heated with the help of electrodes immersed in the slag, adding carbonaceous reducing agent if necessary.

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- .274915

According to the nature of the prog- ress processes, the bath, in which it circulates the flow-through stream, is conventionally divided into zones of proouvka, slag formation, slag washing, settling of slag and settling of the enriched melt.

In the purge zone, when a jet interacts with a bath, a voroyka is formed, from which there is an intensive ejection of flue gases and a liquid melt. In the slagging zone it outlines the separation of mass and slag into two layers of specific weight. To ensure thermal stability of the melt flow, lump ore, pelletized concentrates, etc. are supplied to this zone along with fluxes. In the washing zone, where the initial melt is poured, the formed converter slag is mixed with the poor melt which is poured. In the slag settling zone, covered with a floating layer of flux with a flux coat, the separation of the washed slag from the mass is completed. The flux layer contributes to the thermal stability of the bath in the zone of the slag sediment, and in the case of quartz flux (it ensures the saturation of the converter slag with silica with acid, which leads to a decrease in holding magnetite in the slag. The slag is drained from

 -. L-zone of product settling, located under the zones of blowing and slagging, proI ::; accumulation and settling of the warmed-up melt goes before the release.

formula of invention

1. The method of converting metallurgical melts by oxidative blowing of the melt by blowing, supplied at an angle of 7О 8О to the surface of the bath, which has zones of blowing, slagging and settling of slag, so that, in order to ensure the continuity of the process , expanding the composition of convertible melts and the consumption of converter donkeys, converting is carried out in a variable depth with matching depths of the blowing zones and slag settling equal to O ,, 8, 1ф over the path to a depth of 0, 7 depths of the bath in the blowing zone and the pressure iskhoynoto rasgshava in 1fomyvki was :, zone included between schlakoobraeoVaia zone and settling zone Shpaka,

2, Method 1, characterized in that, for the purpose of more complete depletion of the converter vessel, the sack is released from under the layer of flux supported by the molten bath in the settling zone.