SU129799A1 - A device for refining pig iron on the gutter - Google Patents

Description

The use of a pre-mold-free furnace in a open-hearth furnace up to certain limits of cast iron allows improving the technical and economic indicators of open-hearth smelting. To reduce the silicon content in the iron, it is used to blow it in the ladle or on the trough with air, oxygen, oxygen-vapor mixture, oxygen with c. the addition of iron ore and other reagents. The blowdown is usually dried, assisted, and the nozzles immersed in cast iron. However, blowing into the iron delays the flow of liquid iron, and the intensification of this process can lead to metal throwing from the ladle. Purging at the gutter does not sufficiently assimilate the oxidizing agent. In addition, a high gas pressure is required to inject oxygen into the metal, which complicates the installation.

The described device eliminates these drawbacks and allows for the desiliconization of pig iron on the chute of the blast furnace by introducing a suspension of powdered reagents in oxygen into the molten iron. This is achieved by making the device in the form of a suction funnel with a tangentially supplied iron feed inlet.

The drawing shows a diagram of a device for refining cast iron on the chute.

The device consists of a bunker J with a manhole 2 and a bottom 3, a box 4, a movable pipe 5, a nozzle 6, rollers 7, ti 8 and a funnel 9.

Iron ore powder, with or without the addition of lime, is poured through manhole 2 and bunker 1, the bottom of which is a porous slab. Oxygen is supplied under this plate to box 4 and, passing through the mixture, forms a "fluid bed. As a result, the mixture is poured through the movable pipe 5 into the nozzle 6 and into the cast iron. As the mixture is consumed, the pipe 5 is lowered with the help of rollers 7 and ti g 8. By varying the oxygen pressure, as well as the speed of lowering the pipe, the concentration of the powder in the suspension can be adjusted. Liquid iron from the blast furnace along chute 10 enters the vortex funnel 9. The entrance to the funnel must be tangential. In this case, spiral vortex flows are formed in the cast iron, which entrains the suspension into the metal stream. In vessel 11, refining of cast iron takes place. From it the metal is poured into the ladle.

Subject invention

A device for refining pig iron on a chute, characterized in that, in order to introduce a suspension of powdered reagents in oxygen into the molten iron, it is made in the form of a suction funnel with a tangentially supplied iron inlet.