SU594177A1 - Device for introducing liquid magnesium into iron - Google Patents

Description

one

The invention is from osteopathic to metaphilia and can be used for breeders and pig iron or its modified one.

Devices for introducing magnesium into cast iron are known, which are containers filled with magnesium, which are placed in a ladle before it is poured with liquid metal or dipped into a ladle previously augmented with metal L

Also known are devices with an electromagnetic pump that creates pressure, magnesium, which are permanently attached to a tank with liquid metal (for example, to a ladle or cupola) 2.

The disadvantage of these devices is the difficulty of manufacturing the magnesian wires and their stationary attachment to the liquid metal tank.

A device consisting of

a muffle electric furnace, with a crucible installed on it for melting magnesium, a magnesian conductor and a system for creating a neutral gas pressure in the furnace and ensuring that molten magnesium is transported through the pipeline to the treated iron 3i.

The device is designed to desulfurize large volumes of iron, therefore the magnesian pipe is not equipped with a stationary heating device. The heating of the magnet cable in the device is carried out by the heat of the treated iron when the magnetheel is immersed in it.

A disadvantage of this device is the need to ensure a high degree of tightness of the furnace, the difficulty of replacing the srgp and the magnioprode in case of their exit from Istro, the impossibility of processing small amounts of pig iron in the buckets due to the duration of the heating of the magnioprode. In addition, the large furnace capacity makes it difficult to adjust the gas pressure during processing.

Because of these shortcomings, the device (the gugo has not found wide application in the industry for the treatment of cast iron with maplem.

Claims (3)

The purpose of the invention is to improve the process of adjusting the pressure of an inert gas and its economical expenditure, ensuring the reliability of the operation of the sealing system and the design of the TNP and magnet method. This is achieved by the fact that the device is equipped with a removable sealed crucible, which is made integral with the magnesium conductor of two articulated pipes of different diameters while respecting the parallelism of their axes and is placed in a furnace, the shape of which repeats the shape of articulated crucibles and magnet wires provided with a tip made of reinforced thermal insulation. material. The drawing shows a device for the introduction of liquid magnesium in cast iron, a general view. The device has a removable hermetic crucible I and a magnesian conductor 2, made of two pipes of different diameters and rigidly articulated with each other, while observing the alignment and inserted into the muffle 3 of the electric resistance furnace. The electric furnace muffle has articulated crucibles and a magnesian wire and provides free installation of the latter with a gap of no more than 2 mm. The muffle is made of stainless steel, covered with a layer of mica, on which a spiral of nichrome wire 4 is wound. Thermocouples 5 are installed to control the temperature in the cable and the magnesium conductor. The pipeline 6. For supplying the inert gas is connected to the crucible with the sleeve 7. The crucible loading window is equipped with an airtight cover 8 with a heat insulating screen 9. The tip of the outer magnetic pipe is made of reinforced heat-insulating material based on fireclay and attached to the pipe of the magnetic conductor 2 using sleeve 11 The lining of the tip is placed on the furnace body with a gap of 1-3 mm, which ensures its free movement along the length. A device for introducing liquid magnesium into the iron works as follows. Into the crucible 1 of the furnace, pieces of magnesium and slag-forming additives are loaded through the loading window and the crucible is hermetically closed with a lid 8. Then, inert gas (for example, argun) is fed into the crucible through pipe 6 and switches on the furnace. When the temperature in the furnace and the magnesium conductor reaches Exceeding the melting point of magnesium by 10 ° C, the magnesium fills the magnesium conductor, but in the sleeve 11 of the tip, which is not heated, the magnesium solidifies, which prevents it from spontaneously flowing from the magnesium conductor. Such a STATUS1 device is ready for operation. During operation, the ferrule nozzle 10 is immersed in molten iron, which is located in the ladle, furnace crucible or cupola cup and inert gas, thus providing excess pressure over the molten magnesium mirror. In the Psi of the magnesium-conductor tip into the melt within 2–40 seconds, solidified magnesium is melted in the tip bushing and molten magnesium from the crucible 1 is fed into the molten cast iron under the pressure of an inert gas. The magnet feed rate is controlled by varying the pressure of the inert gas in crucible 1. After the magnesium is completely exhausted from the device (as determined by the termination of the reaction between the magnesium and the iron), the ferrule tip 10 is removed from the iron and the inert gas is stopped. The presence in the device of a heated magnesium wire makes it possible to use it for treating cast iron in small-volume tanks (in an induction furnace crucible, pouring glass into a ladle, a cupola cup). Apparatus of the Invention A device for injecting liquid magnesium into a cast iron containing a muffle electric furnace with a crucible installed inside it, a magnesian conductor to the crucible year of gas supply to the crucible, characterized in that, in order to ensure the processing of any metal volumes, an increased reliability of operation and simplification of the crucible replacement Magnee wire, the crucible is made sealed and removable together with the magnesium wire installed coaxially with the crucible and fitted with a tip of reinforced heat insulating material, secured. using a sleeve at the end of the magnetic conductor, and the furnace muffle is made with a configuration similar to the configuration of a tigp with a magnetic conductor and mounted concentrically around them. Sources of information taken into account in the examination; 1. USSR author's certificate N9 482499, cl. From 21 1 / GS, 1974. 2. USSR author's certificate number 191589, cl. From 21 to 1/00, 1965. 3. Bashenko KN and Sofroni L. Magnesium cast iron. Kiev, Mashgiz, 1957, p. 159. to P