SU1747499A1 - Apparatus for treating metal - Google Patents

Abstract

Use: refining and metal modification. SUMMARY OF THE INVENTION: A funnel tank, the lower part of which is connected to a drain pipe located at an angle to its axis, is connected to the latter also by an additional pipe located at an angle of 15-75 ° C. to the axis of the tank voropki. The area of the inlet of the additional pipe is 0.8-4.5 times smaller than the area of the opening of the drain pipe 1 sludge,

Description

The invention relates to metallurgy and foundry, in particular to the processes of refining and modifying a metal.

A device for treating molten iron with solid reagents is known, which includes an additive dispenser, a conical funnel with a tangentially trough connected to it and a refractory tube connected to it, which is lowered inside the bucket and as it is filled the bucket is flooded with rising metal.

It is also known a device for treating liquid melts with additives, consisting of a hopper with additives of a chute, brought tangentially to the upper tank, lined in the form of a cone, a bottom drain hole, connected by a pipe with a conical nozzle, and a lower tank, in which reflective plates of refractory material are installed.

Closest to the present invention is a vortex mixer containing an additive dispenser, a conical funnel with a tangential flow to it.

the chute and the refractory pipe connected to it, made at an angle of 40-90 ° to the funnel axis with a ratio of the squares of the inlet and outlet openings of the pipe, equal to the ratio of the sum of the funnel heights.

A disadvantage of this device is low metal absorption of the added additives due to the fact that their interaction with the melt mainly takes place in the center of the rotating flow, insufficient mixing of the metal with the vortex jet, as a result, the efficiency of the metal refining and modification processes decreases.

The purpose of the invention is to increase the degree of metal assimilation of the reagents introduced and the intensification of mass transfer processes in the melt during processing.

The goal is achieved by the fact that the metal processing device is additionally equipped with a drain pipe, one end of which is connected to a capacious funnel and the other to a coarse drain, the additional pipe being at an angle of 15-75 ° of the funnel capacity, and its area input

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the holes are 0.8-4.5 times smaller than the area of the inlet of the drain pipe.

This technical solution allows the metal rotating in a conical container to be divided into two streams, followed by their meeting on the drain pipe,

Separation of the rotating metal into two streams allows to intensify the mass exchange of the reagents with the metal and many stages of the processing process; when entering the supplement into the rotating rasplop in the coT of the funnel; at a meeting in the fixed pipe, the lid of the metal otooco and the fall of the jet of phthalum from the discharge pipe of the bucket & As a result, the degree of metal assimilation of the introduced reagents increases and the efficiency of the processes of refining and melt modification increases.

It is known that with metal spilling through a vortex mixer, a significant part of the energy of the rotating jet is spent on its decay. As a result, the mixing power of the metal in the bucket by the vortex jet is 40% less than the freely falling

In the proposed metal treatment apparatus, when two jets of continuous additional pipe flowing out of the inlet orifice meet in the conical part of the funnel and rotating, the latter is deformed. At the outlet of the discharge pipe, the said walls form a freely falling jet, which intensifies mass transfer processes in the metal,

At the angles of inclination of the additional pipe to the defense funnel 15–75 °, the highest degree of metal assimilation of the reagents introduced is achieved.

When the angle of inclination of the additional pipe to the funnel axis is less than 15 °, flow deceleration leads to the fact that the main part of the injected reagents remains in the drain pipe and funnel

When the tilt of the additional pipe to the funnel axis is greater than 75 °, the reagent interacts with the flow coming out of the drain pipe. In this case, the mass exchange takes place at the point of the flow merging, about the cset of the kinetic energy of the flow flowing from the additional pipe. The work of outweighing is the same as when mixing with a free falling stream.

When the ratio of the areas of similar openings of the drain and additional pipes in the range of 0.8-4.5, the greatest intensification of mass transfer processes to the metal and the degree of metal absorption of the introduced reagents is achieved.

When the ratio is less than 0.8, the bulk of the metal passes through an additional pipe. As a result, the main part of the added additives remains in the drain.

pipe, i.e. the flow of metal is braked along with additives passing through the drain hole of the funnel.

An increase in the ratio above 4.5 leads to the fact that the metal stream emerging from the additional pipe due to the small mass flow rate and kinetic anergy does not affect the deformation of the rotating jet. As a result, the required intensification is not achieved.

mass transfer in the melt with additives and the effect of refining or modifying the metal is reduced.

The device for metal processing contains a dispenser t, tangentially connected to the reservoir-worm 2, chute 3, inlet of drain pipe 4, drain pipe 5, inlet of additional drain pipe 6, additionally gel drain pipe 7. metal receiver 8.

The device for metal processing works as follows.

The metal tangentially enters the chute 3 into the reservoir 2, where it acquires a rotational motion and forms a vortex flow. The presence of the inlet of an additional drain pipe b in the conical part of the reservoir funnel allows the flow of the rotating metal to be divided into two that pass through the refractory tubes and

They are found in the drain pipe 7. The additives are fed using the dispenser 1.

The invention is illustrated by the following examples.

The use of this device for treating pig iron with reagents such as CaO and NaaCOs ensured the production of low-sulfur pig iron, the degree of desulfurization of which was between 46-60 and 5875%, respectively, with a consumption of reagents of 1.0-1.5% by weight of the metal being processed,

When using this device to produce nodular cast iron

graphite modifier consumption was 1- 2.5% by weight of the metal being processed.

These data indicate that the proposed device allows not only to efficiently process

 metal, but at the same time reduce the consumption of reagents introduced by 35-60% in comparison with the known.

Forum and Metalworking Device, containing a dispenser, a conical funnel, a groove tangentially connected to the funnel reservoir, and a drain pipe connected to the bottom of the reservoir funnels and located at an angle to its axis, characterized in that, in order to increase the degree of assimilation of the injected reagents and intensify mass transfer processes in the metal, the device is equipped with an additional drain pipe, one end of which is connected to the funnel tank, and the other end is connected to the drain pipe, moreover pipe is at an angle 15-75 ° to the axis of the bone-eat funnel, and the area of its inlet in 0.8-4,5 times smaller than the area of the input aperture of the drain pipe.

Claims (1)

Claim A device for processing metal, with ____ holding a dispenser, a conical container - they steal a freely falling stream, which is in the metal. 40. a chute, a chute tangentially connected to the funnel tank and a drain pipe connected to the lower part of the funnel and located at an angle to its axis, characterized in that, in order to increase the degree of assimilation of the introduced reagents and the intensification of mass transfer processes in the metal, the device is equipped with an additional drain pipe, one end of which is connected to the funnel, and the other end to the drain pipe, the additional pipe being located at an angle of 15-75 ° to the axis of the funnel, and the inlet area is 0.8-4 5 times less the area of the inlet of the drain pipe.