RO116257B1 - Installation for injecting pulverous materials in molten metals - Google Patents

Abstract

The invention relates to an installation for injecting pulverous materials in molten metals meant to enhance the physico-chemical processes taking place during the melting operation and the refining of smelt. According to the invention, the installation comprises a tank (1) for pulverous or granulated materials wherefrom said materials flow under the action of the gravitational force into a worm-dispenser (4) ensuring the uniform and constant dosing of materials dispensed to a liquefying container (9) connected with a driving nozzle (12) and some turbulence-liquefying nozzles (13) feeding the gas which is homogeneously mixed with the particles to be injected. The uniform distribution of the combined mixture gas-particles is accomplished by means of a perforated screen (14) and a perforated diffuser (12) and an eccentric vibrator (23) which is located at the lower part of the liquefying container (9) induces a turbulent-helical motion in a deflecting gate (16) and further, through a upsetting pipe (17) to an injection lance, inside the metal bath.

Description

RO 116257 B

The invention relates to a plant for injecting powdered or granular materials into metal melts, in order to intensify the physico-chemical processes during the development and refining of melts.

There are known installations for injecting powdered materials into metal melts which ensure their uniform distribution in the melts, by means of dispersers and which, depending on the size of the particles and the flow rates of material and gases used, are equipped with dosing systems, either with a pusher, a fluidizer, or a vibrator.

The problem that the invention solves consists in creating an installation that allows the injection of any type of powdered or granulated material into metal melts, continuously, without shocks, with the possibility of regulating the powder and gas flow rate.

The problem is solved with an installation consisting of a reservoir container, connected to a screw feeder and placed above a fluidization container inside which are mounted, respecting hydraulic criteria, a cone for the distribution of the powdered material by free fall into the container, a fluidization system composed of a sieve, a perforated diffuser, some nozzles for driving the carrier gas for fluidization and a deflector funnel that takes the homogeneous gas-particle mixture and sends it to the injection lance through a discharge pipe, the entire system being fixed on a support frame with possibilities of movement on the ground, both horizontally and vertically, towards the metallurgical aggregate for the elaboration or treatment of the metal melt.

The installation according to the invention has the following advantages:

- allows the use of powdery materials with variable particle sizes, smaller than 5.0 mm;

- ensures continuous, homogeneous supply, with possibilities to regulate the powder and gas flow rate;

- can be used in the treatment of metal melts to intensify specific metallurgical processes, both in the processing unit and in refining facilities.

The invention is further presented in connection with the figure, which represents a partial sectional view in a vertical plane through the installation.

The installation, according to the invention, consists of a tank container 1 into which is introduced, by means of a feed connection 2, a mixture 3 of powdery or granular materials in the appropriate quantity required by the metallurgical process. The lower part of the tank container 1 has a frustoconical shape, the angle a described by its generator with the horizontal being greater than the natural slope angle of the powdery materials used, in order to ensure a continuous natural fall, under the action of gravitational force, into a screw feeder 4, through an outlet connection 5.

The auger feeder 4, which takes up, transports and uniformly doses the material, but also with flow rate adjustment possibilities, in quantities rigorously determined according to the granulation and physical and chemical properties of the powdered or granulated material, is driven by a drive group, consisting of a DC motor 6, a speed variator 7 and a tachometer 8. The material is introduced into a fluidization container 9 and falls into a distribution cone 10 which directs it radially.

Claims (1)

RO 116257 B towards its wall towards the lower part. The gas for entraining and fluidizing the powder mixture coming from an external source, not shown, enters the fluidizing container through a connection 11, through a driving nozzle 12, as well as through some turbulence - fluidizing nozzles 13. When passing through a perforated sieve 14, the gas jet is distributed uniformly over the entire section of the container, its pressure 50 maintaining the powder material in suspension. Through a perforated diffuser 15, the gas enters tangentially into the fluidization container 9 due to the inclination of the perforated channels made in the diffuser, imparting a turbulent - helical movement to the suspension mixture (powdery material - gas) and driving it, through a deflector funnel 16 and a discharge pipe 17, outside the installation, in the form of a homogeneous jet 55 to be injected into the metal melt by means of the injection lance. To ensure operational safety, the installation is provided with connections 18 for venting the containers and with inspection connections (inspection holes) 19, the pressure equalization between the two containers being done by means of an elastic pipe fixed between connections 20, and the pressure measurement, with the help of manometers. The installation itself is stiffened by means of fixing elements 21 by a support frame 22, which is provided with possibilities of movement to the processing unit or the treatment-refining container of the metal melt, both horizontally and vertically. The installation is vibrated during the entire duration of the technological process by a vibrator fixed on the support - frame, powered 65 by direct current and provided with an eccentric 23, in order to make the fluidization process more efficient and to prevent material deposits on the transport routes of the technological mixture. The operation of the installation is monitored from a control panel, not shown, equipped with measuring and control devices for working parameters. 70 Claim Installation for injecting powdered materials into metal melts, comprising a reservoir for the materials to be injected, from which they flow into a screw feeder that directs them to a fluidization container, characterized in that the fluidization container (9) is mounted in connection with a drive nozzle [12] and with some turbulence-fluidization nozzles [13] for introducing a gas that mixes homogeneously with the particles of powdered or granular material injected, the uniform distribution of the mixed gas-particle mixture being achieved by means of a perforated screen [14] and a diffuser [12], also perforated, at the lower part of the diffusion container [9] being placed a vibrator [23] with an eccentric that induces a turbulent - helical movement in a funnel - deflector [16] and further, through a discharge pipe (17), to an injection lance inside 85 metal baths. President of the examination committee: Eng. Radu Anghel Examiner: Eng. Spătaru Magdalena