SU863653A1 - Method of continuous treatment of liquid cast iron with magnesium - Google Patents

Description

{54) METHOD FOR CONTINUOUS PROCESSING OF LIQUID IRON BY MAGNIUM

 . . G /. .. ;. The invention relates to black steel metallurgy, in particular to secondary treatment of liquid iron in a stream. There is a known method for introducing low-boiling additives into the melt in pure form, which concludes that the additives are loaded into the melt in a shell of a tightly fusible porous cermet material and the method of non-domain devulphurization of cast iron with magnesium in the ladle using a bell-type device, which means that the magNII is enclosed in a metallic Sh shell. The closest to the proposed technical essence and the achieved effect is the method of introducing magnesium into molten heavy metals and alloys with high temperature. melting, backing is that magnesium is introduced in the form of whole grains of crushed briquettes of considerable specific weight, made from a mixture of magnesium and iron powders, as well as porous materials based on metal ceramics impregnated with melted magnesium into a stream of liquid iron G2. However, in the known method, due to the high heat transfer from the melt to the bodies immersed in it, it is essential to slow down the rate of heating and preparation of the additive (HY; reluto) In order to stretch these processes in time and, thus, the degree and stability of assimilation The reagent / magnesium-impregnated porous material must have at least an ol cooling surface. The purpose of the invention is to increase the degree and stability of the assimilation of magnesium in the molten pig iron. The aim is achieved by the fact that according to the method of processing liquid iron the mag By injecting magnesium into the stream of molten iron, the stream is passed through a rotating stream through a channel in a block of passivated magnesium, and the outer surface of the block is cooled in the process. The drawing shows a flow chart of the iron treatment, explaining the proposed method. at a casting temperature of 1300-1460 C, the metallurgical aggregate or ladle enters the trough of the vortex funnel 1. Due to the tangential supply of metal to the funnel, the melt acquires a rotational motion and merges the rotating flow 2 through a channel in block 3 of magnesium passivation, where the reagent melts and evaporates. Magnesium vapor in the form of powder 4 is displaced by centrifugal forces into the central flow zone, intensively mixed with the metal and absorbed by the molten iron during its flow through the block of passivated magnesium. The block is cooled outside, which allows the evaporation of magnesium to significantly extend in time. Due to the cooling of the block of passivated magnesium, as well as the rotational movement of the flow of iron through the channel of the block, an increase in the degree and stability of the absorption of magnesium by the molten iron is achieved. After cast iron treatment, the passivated magnesium block is replaced.

Tests on the continuous processing of a stream of molten iron are carried out

Known 0.45 0.03

Offer0, 08 0.045

Expected "apesky effect

40-45 thousand rubles per year one plant.

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Claims (2)

1. Author's certificate of the USSR 367157, cl. p 21 C 7/00, 1971. 2. Authors certificate of the USSR 90688, cl. C 21 C 1/02, 1949.