UA95876C2 - Lance for desulfurization of cast iron by discrete magnesium - Google Patents

Abstract

The invention relates to ferrous metallurgy and can be used for desulfurization of large masses of cast iron, particularly in large-size ladles with capacity of 140-350 t. A lance is disclosed which comprises a frame from refractory lining, channel with flag of two-phase flow, offtakes with changeable nozzles integrated under angle of 45±15° to vertical axis of lance and provided with refractory inserts. A cone distributor is integrated in flag of two-phase flow, with base diameter equal to the diameter of lance channel, and angle at vertex of cone is equal to inclination angle of lance channel offtake relative to vertical axis of lance. The offtakes are made rectilinear with diameter of inlets selected from set ratio. The inlets of offtakes are made with tapering α = 5-10°. The technical result is in provisionof introduction stability and increase of introduction intensity of discrete magnesium reagent, reduction of duration of cast iron processing, decrease of operational expenses on repair of lances.

Description

of flows due to the expansion of the cross-section by the section Comparison of the proposed lance with other channels also hinders significant rationalization of the injection parameters by technical solutions known in this area, i.e., the increase made it possible to identify in them the signs that distinguish the concentration of the reagent in the gas carrier and the decrease of the - from the prototype. carrier gas consumption. Therefore, the declared lance meets the criteria

Desulphurization of high-sulfur cast iron at the "inventive level" terium. heavy-duty ladles and obtaining low-sulfur- The essence of the invention of the lance is explained by drawing cast iron must be introduced into the melt up to 200 nm, where Fig. 1 shows the design of the lower chas- kg and more magnesium. Even with the intensity of the mud supply of the 4-nozzle lance in a longitudinal section. magnesium 14-20 kg/min., which is provided by a two-nozzle. The applied lance includes a frame 1 with a lance (21, a longer duration is required in the refractory lining 2, a channel from the lance for separating the reagent into cast iron (10-14 min.) A larger three-divider 4 of a two-phase flow with a built-in extension of the processing cycle leads to a decrease in the incisor 5 in the form of a cone, rectilinear branches of the stability of the lances and an increase in the labor intensity of their replacement nozzles 7, which are provided with fire three-service. In addition In addition, a restriction is introduced on the filling of buckets with cast iron, the free space in the diameter of the base of the cutter 5, made at the top should be at least 0.4 m.

The problem solved by the invention consists in the angle " at the top of the cutter is equal to the angle of inclination, increasing the intensity of the introduction of granular rectilinear outlet 6 of the lance channel relative to magnesium into liquid cast iron, ensuring a reliable vertical axis of the lance. Pneumatic transportation of granular magnesium and high- indicators of desulphurization of cast iron in velikohads are chosen from the above ratio: barite ladles.

The task is solved as a result of the fact that the splitter in the form of a cone is built into the separator of the two-phase flow, the diameter of the base of which is equal to the diameter of the nozzle channel, and the angle at two is the diameter of the inlet holes of the taps, mm; at the top of the cone is equal to the angle of inclination of the lead, kadk - the diameter of the lance channel, MM, o, the lance of the lance relative to the vertical axis of the lance. At point 7, the number of taps, pcs., and the input holes, taps are made rectilinear, taper diameters are made with taper c-5-107. rum of the entrance holes, which is chosen from the relation- The operation of the claimed tuyeres is carried out: 1809 in the following way. In the hopper with magnesium (in the drawing no

Ovkh - Yakovip---, shown) create an excess pressure that exceeds the resistance of the injection system when the nozzle is immersed in the cast iron, open the supply of transporting gas and gas from the magnesium bunker into the nozzle and immerse the nozzle

Ovh. - diameter of inlet holes of taps, mm; into the molten iron to the required depth. Including - ak - the diameter of the lance channel, mm; they use a dosing device (not shown in the drawing) n - NUMBER of taps, pcs., and the input outlets of the reagent and the granular magnesium pneumotrans of the taps are made with a taper of 7: -5-10". ported into the channel Z of the lance and further through section-

The technical result of using a lance, nick 4 of a two-phase flow, rectilinear taps 6 and what is claimed, consists in providing a stable variable nozzle 7 - in molten iron. After the injection of granular magnesium into molten iron, the required amount of reagent, its supply is stopped, the nozzle is pulled out of the metal, and the magnesium transport, increasing the filling of ladles with cast iron, the burning gas is blocked. reduction of the duration of processing of cast iron and, accordingly, the essence of the declared lance consists in reducing the labor costs for the repair of lances. Phnom Penh

A comparison of the declared lance with the proto-U two-phase flow separator built-in type showed that it differs from the cone-shaped separator, the diameter of the base of which the two-phase flow separator is built-in is equal to the diameter of the lance channel, and the angle p at the a cone in the form of a cone, the diameter of the base of which is equal to the angle of inclination of the channel of the nozzle, and the angle at the top of the vertical axis of the nozzle. This ensures the equality of the cone is equal to the angle of inclination of the channel of the nozzle, the angles of incidence and reflection of particles of the solid phase two relative to the vertical axis of the lance. At the same time, the phase flow from the splitter also contributes to the movement of the particles of the tap oo What t z c With a diameter of ВхІ parallel to the longitudinal axes of the taps. n in the form of a cone, rectilinear taps with the diameter of the inlet holes, chosen so that they have a point of contact and made with taper, allow h. - diameter of inlet holes of taps, mm; ensure almost equal separation of the two-phase dk - diameter of the nozzle channel, mm; of the flow before its introduction into the taps. The presence of the number of taps, pcs., and the inlets of the diverter in the flow distributor allows to reduce the number of taps made with a taper of 9-5-102, the minimum expansion along the section of the lance channel and

Therefore, the claimed tuyeres meet the criteria of "novelty" that promotes the uniformity of the separation of the two-phase flow. only for two, but also for 3, 4 and more

kiv, and also minimizes the speed loss, the steady introduction of granular magnesium into the liquid cast iron from the two-phase flow and the increase in concentration at a high intensity, and shorten the full cycle of granular magnesium in the carrier gas. cast iron processing. Distributed introduction of grains - the diameter of the input holes! you see magnesium in liquid cast iron in a combination of ionic holes! in(0gvo bra Z oho magnesium a combination from the ration o. input. Z Oko BI by b zation of the injection parameters, ensures the technical ratio so that, regardless of the number of taps, they can be placed in the separator with free tallow soap for treatment with small flows so that they have common points of contact, and the technical and economic indicators of the process, that is, in the circumference and diameter, equal to the diameter, the stability of the tufts increases, corresponding to the lower channel, an inscribed regular polygon with a number of oFUurms, corresponding to the number of sides p. The length of the side of the multi-line DOZ of the catchment, the height of which is equal to the diameter of the inlet opening of the tap. Proposed assimilation of magnesium by the slag, and, therefore, a new technical solution is decided. holes d d U r taps, that is, excludes the occurrence of pulsations, resulting disturbances and the increase of resistance in the injection system. 1 pe Movo Ukraine p216 1002. Furma for

Execution of inlet holes with taper c: -5- "Shon , Y and sho, I esulation of cast iron with granular magnesium in large 107 allows to reduce local resistance during the transition of desulfurization of grains in white and coloading ladles / Bolshakov V.I., Shevchenko channel of the tuyere to the taps and stabilize the speed of A.P., Ostapenko A.V., Dvoskin B.V., Kislyakov V.G two-phase flow in the taps and further in the nozzles to Aleksandrov in Bashmakov A. M. Shevchenko at the moment the jet exits the tuyere With a conicity of 2, Pat. Me 86325 Ukraine, C21С 1/02. The size of the inlet holes is more than 5-10" there is a significant increase in resistance in this section there are pulsations! heavy-duty buckets / V.I. Bolshakov, Shevche- in the injection system. Reducing the taper to less than A.P., Ostapenko A.V., Dvoskin B.V., Shevchenko 0-5" is impractical from a constructive point of view. S.A., Kislyakov V.G., Aleksandrov V.O., Bashmakov

As can be seen from the above, the use of A.M., V.M. Shevchenko - a prototype. lancet, which is declared, allows to provide

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Computer layout by A. Ryabko Signature Circulation 23 approx.

State Intellectual Property Service of Ukraine, st. Urytskogo, 45, Kyiv, MSP, 03680, Ukraine

SE "Ukrainian Institute of Industrial Property", str. Glazunova, 1, Kyiv - 42, 01601