A method of removing the majority of a molten metal from a metal melt container through an outlet opening formed in its bottom surface, a metal melt container and a flowchart of the primary operations to perform said method

摘要

The invention relates to metal manufacture in ferrous and non-ferrous metallurgy and is represented by the example of steelmaking in arc steel-smelting furnaces. Before the start of chamber emptying the method provides level ascending of metal input into the outlet and retaining of this position till the end of chamber discharging. After that the initial position of input level must be restored, at that the leaving metal flows are separated from the metal flows ascending to the input of the outlet by the wall the height of which determines the ascending value of level of metal coming into the outlet. The method provides an influence on chemical composition of molten metal by delivery of alloy element into the metal flows leaving the chamber that is carried out together with feeding of inactive or inert gas. There is contemplated preliminary circulation of these gases through the metal situated over the outlet and inside the clearances for metal passing. The smelting chamber for method of its discharging contains a spindle with its possible vertical movement up to its removal outside the limits of chamber (upward displacement) and to the bottom surface of chamber (downward displacement). The spindle is situated oppositely to the outlet and is ended below by glass-shaped enclosure where extension having a through hole is rigidly fixed by bridges. The extension stands for the limits of the spindle; the height of this jut as well as the height of extension and slag layer thickness determines amount of metal being left inside the chamber. The spindle possesses a central hole for addition of alloy elements and inactive or inert gas into the leaving metal flows. The gas should be preheated. Spindle is made with replaceable lower part. The invention provides a sequence of basic working operations for method realization.