|About this Abstract
||Liquid Metal Processing & Casting Conference (LMPC 2019)
||Liquid Metal Processing & Casting
||Towards Prediction of the ESR Ingot Composition
||Ganna Stovpchenko, Lev Medovar, Ludmila Lisova, Iaroslav Gusiev, Dmytro Kolomiets, Artem Sybir
|On-Site Speaker (Planned)
The new look to the electroslag remelting (ESR) process as a physicochemical system is proposed and grounded. The fundamental distinct of the ESR from any “batch” steelmaking processes (going in BOF, EAF, LF and VD/VOD etc.) is that a slag to metal ratio drastically changes while remelting and the slag bath is just slightly refreshing (to compensate losses for slag skin formation) without change of its mass. At the very beginning, the slag to metal ratio starts from infinity, and to the process, end approaches so known “slag consumption” value that usually makes 15-30 kg per ton. In traditional thermodynamic calculation the exact this value is used that unable predicting of the chemical composition on the height of the ingot. Besides, at all kind of the ESR processes, the physic-chemical interactions occur in two subsystems “gas - liquid slag” and “liquid slag - liquid metal”, because the molten slag layer makes a border dividing the entire melting space. Irrespective of the ESR process organisation, gas atmosphere (vacuum, protective gases, open air or pressurized gas) has no direct contact with molten liquid metal that should be taken into account. Thermodynamic calculations and experimental investigations were performed to reveal the obstacles affecting active elements losses and connected changes in slag chemistry and properties. The procedure of physicochemical simulation of the complex interactions in the reacting system “gas-slag-metal” at the ESR was developed and verified. It allows predicting the changes in the content of elements on the height of ESR ingot as well as changes in slag composition while the ESR melting process in a protective gas.
||Definite: At-meeting proceedings